Cosmetic-fluid dispenser

Abstract

There is provided a cosmetic-fluid dispenser comprising: an elongate main body having a cosmetic-fluid storage space defined therein to contain cosmetic fluid therein, wherein the elongate main body has a chamber body portion; a fluid-communication chamber defined in the chamber body portion in a first direction, wherein the first direction is a direction perpendicular to a longitudinal direction of the elongate main body; an actuation mechanism at least partially hollowed and insertable into the fluid-communication chamber, wherein a top thereof protrudes outside the fluid-communication chamber, and a bottom thereof is received in the fluid-communication chamber, and has a bottom inlet hole defined therein; a first vertical elastic hollow member having a lower end disposed on a bottom face of the fluid communication chamber, wherein at least a portion of an upper portion thereof is inserted into the actuation mechanism through the bottom inlet hole; a first fluid communication channel defined in the chamber body portion in a direction away from the cosmetic-fluid storage space; a second fluid communication channel defined in the chamber body portion to fluid-communicate with the cosmetic-fluid storage space; and a cosmetic-fluid outlet structure configured to communicate with the first fluid communication channel, wherein the cosmetic-fluid outlet structure has a fluid discharging hole defined in a distal end thereof and exposed to an outside of the dispenser, wherein a top of the chamber body portion has a first round concaved top portion having an opening defined therein through which the actuation mechanism passes into the chamber, wherein an outer face of the top of the actuation mechanism has a shape conformal to a round concaved shape of the round concaved top portion.

What is claimed is: 
     
         1 . A cosmetic-fluid dispenser comprising:
 an actuation mechanism configured to enable selective dispensing of a cosmetic-fluid;   a elongate main body having a main inner space defined therein and opposite first and second end portions, wherein the main body has a first opening defined in a side portion thereof, wherein the main inner space contains therein a cosmetic-fluid, wherein the actuation mechanism passes through the first opening to enable the selective dispensing of a cosmetic-fluid;   a fluid-communication chamber disposed in the first end portion of the elongate main body, wherein the fluid-communication chamber fluid-communicates with the elongate main body, wherein the fluid-communication chamber is configured to cooperate with the actuation mechanism to dispense a cosmetic-fluid out of the elongate main body;   a distal cosmetic-fluid outlet structure fluid-communicating with the fluid-communication chamber, wherein the distal cosmetic-fluid outlet structure is disposed out of the main body; and   a cap removably coupled to the elongate main body at the first end portion,   wherein the fluid-communication chamber includes a chamber body having a cylindrical inner space defined therein, and a cosmetic-fluid outlet guide in fluid-communication with the chamber body, wherein a cosmetic-fluid outlet guide is in fluid-communication with the distal cosmetic-fluid outlet structure, wherein the chamber body has a fluid-inlet hole formed therein, a fluid-outlet hole fluid-communicating with a cosmetic-fluid outlet guide, and a second opening position-corresponding to the first opening, wherein a cosmetic fluid stored in the main body flows into the cylindrical chamber through the fluid-inlet hole,   wherein the actuation mechanism is configured:   upon application of an external force thereto, to move in a first direction to be at least partially inserted to the cylindrical space in the chamber body, thereby to discharge a first volume of cosmetic fluid contained in the cylindrical space in the chamber body through the fluid-outlet hole into the cosmetic fluid outlet;   upon release of the applied external force, to move in a second direction opposite to the first direction, thereby to enable a cosmetic fluid of the same volume as the first volume to flow from the main body into the chamber body through the fluid-inlet hole,   wherein the actuation mechanism includes:   a pushed portion protruding out of the elongate main body to receive the external force;   an insertable cylinder connected to the pushed portion and passing through the first and second openings; and   a first elastic member loaded on the insertable cylinder and disposed within the cylindrical space in the chamber body, wherein the first elastic member is elastically deformed via the insertable cylinder when the external force is applied to the pushed portion, wherein the first elastic member is restored by an elastic restoring force when the external force is released,   wherein when the external force is applied to the pushed portion, the insertable cylinder is moved from a first position to a second position; when the external force applied to the pushed portion is released, the insertable cylinder is moved from the second position to the first position by the first elastic member,   wherein when the insertable cylinder is at the second position, the fluid-inlet hole is closed to disallow flow of a cosmetic-fluid through the fluid-inlet hole; when the insertable cylinder is at the first position, the fluid-inlet hole is opened to allow flow of a cosmetic-fluid through the fluid-inlet hole.   
     
     
         2 . The dispenser of  claim 1 , the cylinder is lowered from a first position to a second position via external force being applied the pressed portion, while the cylinder rises up from the second position to the first position via elastic restoring force of the first elastic member, wherein when the cylinder is at the second position, the fluid inlet hole is closed while the cylinder is at the first position, the fluid inlet hole is opened,
 wherein the cap further comprises a fastening rib projecting from a distal end of the cap toward the actuation mechanism,   wherein the actuation mechanism further comprises a step portion formed between the pushed portion and the insertable cylinder, the step portion having a diameter smaller than a diameter of the pushed portion,   wherein the fastening rib extends toward the step portion, wherein a distal end of the fastening rib is rounded to shape-correspond to an outer circumference of the step portion,   wherein the fastening rib protrudes toward an outer side face of the step portion so as to support a bottom of the pushed portion thereon to prevent movement of the pushed portion.   
     
     
         3 . The dispenser of  claim 1 , wherein the actuation mechanism includes an proximal sealing ring coupled to the insertable cylinder, wherein the proximal sealing ring is configured to prevent escape of a cosmetic fluid out of the cylindrical space of the chamber body when the insertable cylinder moves from the first direction to the second direction or from the second direction to the first direction,
 wherein the proximal sealing ring is configured to prevent air flow in and out of the cylindrical space of the chamber body through the first opening,   wherein the proximal sealing ring is engaged with a proximal end of an inserted portion of the insertable cylinder, wherein the proximal sealing ring projects further outwardly than an outer diameter of an extension portion between a proximal end and a distal end of an inserted portion of the insertable cylinder,   wherein the extension portion has a diameter substantially equal to a diameter of the cylindrical space defined in the chamber body, and each of the proximal end and the distal end of an inserted portion has a diameter smaller than the diameter of the extension portion,   wherein in the movement of the cylinder, the proximal sealing ring is compressed by a cylindrical inner wall of the chamber body to have a diameter substantially equal to a diameter of the cylindrical space of the chamber body,   wherein the actuation mechanism further includes a distal sealing ring coupled to the insertable cylinder, wherein the distal sealing ring slides along and on the cylindrical inner wall of the chamber body when the insertable cylinder moves from the first direction to the second direction or from the second direction to the first direction,   wherein the distal sealing ring is engaged with the distal end of the inserted portion of the insertable cylinder, wherein the distal sealing ring further projects outwardly beyond the diameter of the extension portion between the proximal and distal ends of the inserted portion of the insertable cylinder,   wherein, in the movement of the cylinder, the distal sealing ring is compressed by the inner wall of the chamber body to have a diameter substantially the same as the diameter of the cylindrical space of the chamber body.   
     
     
         4 . The dispenser of  claim 1 , further comprising a compressing member disposed in the main inner space of the elongate main body, wherein the compressing member is configured to divide the main inner space into a first inner sub-space and a second inner sub-space, wherein a cosmetic-fluid is stored in the first inner sub-space defined between the compressing member and the fluid-communication chamber,
 wherein when the external force applied to the actuation mechanism is released such that a cosmetic fluid of the first volume from the cosmetic fluid stored in the first inner sub-space passes through the fluid-inlet hole into the cylindrical space, the compressing member is displaced in a sliding manner along and on an inner face of the elongate main body such that a volume of the first inner sub-space is reduced by the first volume.   
     
     
         5 . The dispenser of  claim 4 , further comprising a sealing cap passing through and sealing the second end of the elongate main body, wherein the second inner sub-space is defined between the compressing member and the sealing cap,
 wherein when a volume of the first inner sub-space is reduced by the first volume, a volume of the second inner sub-space is expanded by the first volume.   
     
     
         6 . The dispenser of  claim 1 , wherein the distal cosmetic-fluid outlet structure includes:
 an outlet hole formed in a downstream region thereof for discharging a cosmetic-fluid; and   an inserted portion formed in an upstream region thereof and inserted into a distal end of the cosmetic-fluid outlet guide,   wherein when the inserted portion is inserted into the distal end of the cosmetic-fluid outlet guide, a spacing is defined between an outer peripheral surface of the inserted portion and an inner peripheral surface of the cosmetic-fluid outlet guide,   wherein the inserted portion has a first inserted sub-portion, a second inserted sub-portion, and a hole-opening/closing member,   wherein the first inserted sub-portion defines therein a first fluid-communication channel in fluid-communication with the outlet hole, wherein the first inserted sub-portion has a first fluid-communication hole defined therein to allow fluid-communication between the first fluid-communication channel and the spacing,   wherein the second inserted sub-portion defines therein a second fluid-communication channel in fluid-communication with the fluid-outlet hole, wherein the second inserted sub-portion has a second fluid-communication hole defined therein to allow fluid-communication between the second fluid-communication channel and the spacing,   wherein the hole-opening/closing member is constructed to surround the second fluid-communication hole and to control flow of a cosmetic-fluid through the second fluid-communication hole.   
     
     
         7 . The dispenser of  claim 6 , wherein when an external force is applied to the actuation mechanism, the hole-opening/closing member is elastically deformed via a pressure generated by a cosmetic-fluid moving toward the distal end of a cosmetic-fluid outlet guide through the fluid-outlet hole, thereby to open the second fluid-communication hole,
 wherein when the external force applied to the actuation mechanism is released such that the pressure is weakened, the hole-opening/closing member is restored by an elastic restoring force, thereby to close the second fluid-communication hole.   
     
     
         8 . The dispenser of  claim 1 , wherein a removable cosmetic-fluid storage unit is removably received in the main inner space of the main body, wherein the removable cosmetic-fluid storage unit includes:
 a removable elongate body having an elongate inner space therein, wherein the removable elongate body is removably inserted into the inner space of the elongate main body;   a compressing member disposed in the elongate inner space to divide the elongate inner space of the removable elongate body into a first inner sub-space and a second inner sub-space; and   a sealing cap configured to seal the inner space of the removable elongate body and the second end of the elongate main body,   wherein a cosmetic-fluid is stored in the first inner sub-space defined between the compressing member and the chamber body of the fluid-communication chamber,   wherein when the external force applied to the actuation mechanism is released so that a cosmetic-fluid of the first-volume from a cosmetic-fluid stored in the first inner sub-space passes through the fluid-inlet hole into the cylindrical space of the chamber body, the compressing member is displaced in a sliding manner along and on an inner face of the removable elongate body so that a volume of the first inner sub-space is reduced by the first volume.   
     
     
         9 . A cosmetic-fluid dispenser comprising:
 an actuation mechanism configured to enable selective dispensing of a cosmetic-fluid;   a elongate main body having a main inner space defined therein and opposite first and second end portions, wherein the main body has a first opening defined in a side portion thereof, wherein the main inner space contains therein a cosmetic-fluid,   wherein the actuation mechanism passes through the first opening to enable the selective dispensing of a cosmetic-fluid;   a fluid-communication chamber disposed in the first end portion of the elongate main body, wherein the fluid-communication chamber fluid-communicates with the elongate main body, wherein the fluid-communication chamber is configured to cooperate with the actuation mechanism to dispense a cosmetic-fluid out of the elongate main body;   a distal cosmetic-fluid outlet structure fluid-communicating with the fluid-communication chamber, wherein the distal cosmetic-fluid outlet structure is disposed out of the main body; and   a cap removably coupled to the elongate main body at the first end portion,   wherein the fluid-communication chamber includes a chamber body having a cylindrical inner space defined therein, and a cosmetic-fluid outlet guide in fluid-communication with the chamber body, wherein a cosmetic-fluid outlet guide is in fluid-communication with the distal cosmetic-fluid outlet structure, wherein the chamber body has a fluid-inlet hole formed therein, a fluid-outlet hole fluid-communicating with a cosmetic-fluid outlet guide, and a second opening position-corresponding to the first opening, wherein a cosmetic fluid stored in the main body flows into the cylindrical chamber through the fluid-inlet hole,   wherein the actuation mechanism is configured:   upon application of an external force thereto, to move in a first direction to be at least partially inserted to the cylindrical space in the chamber body, thereby to discharge a first volume of cosmetic fluid contained in the cylindrical space in the chamber body through the fluid-outlet hole into the cosmetic fluid outlet;   upon release of the applied external force, to move in a second direction opposite to the first direction, thereby to enable a cosmetic fluid of the same volume as the first volume to flow from the main body into the chamber body through the fluid-inlet hole,   wherein the actuation mechanism includes:   a pushed portion protruding out of the elongate main body to receive the external force;   an insertable cylinder connected to the pushed portion and passing through the first and second openings; and   a first elastic member loaded on the insertable cylinder and disposed within the cylindrical space in the chamber body, wherein the first elastic member is elastically deformed via the insertable cylinder when the external force is applied to the pushed portion, wherein the first elastic member is restored by an elastic restoring force when the external force is released,   wherein the fluid-communication chamber further includes:   a hollow cosmetic-fluid inlet guide having a proximal portion in fluid-communication with the fluid-inlet hole and a distal portion protruding into the main inner space of the main body;   a hole-opening/closing member elastic support received in a cosmetic-fluid inlet guide and configured to support a hole-opening/closing member;   the hole-opening/closing member disposed at a distal end of the hole-opening/closing member elastic support; and   a hollow elongate cover surrounding the distal portion of a cosmetic-fluid inlet guide, wherein the hollow elongate cover has first and second holes defined in proximal and distal ends thereof respectively, wherein a portion of the cover contacting the hole-opening/closing member has a truncated cone shape,   wherein when the external force is applied to the pushed portion, the insertable cylinder is moved from a first position to a second position; when the external force applied to the pushed portion is released, the insertable cylinder is moved from the second position to the first position by the first elastic member,   wherein when the insertable cylinder is at the second position, the second hole is closed via the hole-opening/closing member being pressured by the hole-opening/closing member elastic support, thereby to disallow flow of a cosmetic-fluid through the fluid-inlet hole,   wherein when the insertable cylinder is at the first position, the second hole is opened to allow flow of a cosmetic-fluid through the fluid-inlet hole.   
     
     
         10 . The dispenser of  claim 9 , wherein the cylinder is lowered from a first position to a second position via external force being applied the pressed portion, while the cylinder rises up from the second position to the first position via elastic restoring force of the first elastic member, wherein when the cylinder is at the second position, the fluid inlet hole is closed while the cylinder is at the first position, the fluid inlet hole is opened,
 wherein the cap further comprises a fastening rib projecting from a distal end of the cap toward the actuation mechanism,   wherein the actuation mechanism further comprises a step portion formed between the pushed portion and the insertable cylinder, the step portion having a diameter smaller than a diameter of the pushed portion,   wherein the fastening rib extends toward the step portion, wherein a distal end of the fastening rib is rounded to shape-correspond to an outer circumference of the step portion,   wherein the fastening rib protrudes toward an outer side face of the step portion so as to support a bottom of the pushed portion thereon to prevent movement of the pushed portion.   
     
     
         11 . The dispenser of  claim 9 , wherein a proximal end of the cosmetic-fluid inlet guide has a diameter larger than a diameter of the fluid-inlet hole so as to surround the fluid-inlet hole,
 wherein a diameter of the first hole of the hollow elongate cover is greater than a diameter of the second hole thereof, wherein a distal end of the hollow elongate cover has a truncated cone shape,   wherein the hole-opening/closing member elastic support includes a spring received in the cosmetic-fluid inlet guide,   wherein the hole-opening/closing member is disposed at the distal end of the hole-opening/closing member elastic support and has a spherical shape, wherein the hole-opening/closing member is configured to reversibly open and close the second hole of the hollow elongate cover via a force exerted by the hole-opening/closing member elastic support.   
     
     
         12 . The dispenser of  claim 11 , wherein a first fastening structure is formed on and along an outer circumference of the cosmetic-fluid inlet guide, and a second fastening structure is formed on and along an inner circumference of the hollow elongate cover, wherein via engagement between the first fastening structure and the second fastening structure, the hollow elongate cover is tightly coupled to the cosmetic-fluid inlet guide,
 wherein the cosmetic-fluid inlet guide is inserted into the hollow elongate cover such that the fluid-inlet hole and the second hole of the hollow elongate cover are arranged so as to fluid-communicate with each other.   
     
     
         13 . The dispenser of  claim 9 , wherein the actuation mechanism includes an proximal sealing ring coupled to the insertable cylinder, wherein the proximal sealing ring is configured to prevent escape of a cosmetic fluid out of the cylindrical space of the chamber body when the insertable cylinder moves from the first direction to the second direction or from the second direction to the first direction,
 wherein the proximal sealing ring is configured to prevent air flow in and out of the cylindrical space of the chamber body through the first opening,   wherein the proximal sealing ring is engaged with a proximal end of an inserted portion of the insertable cylinder, wherein the proximal sealing ring projects further outwardly than an outer diameter of an extension portion between a proximal end and a distal end of an inserted portion of the insertable cylinder,   wherein the extension portion has a diameter substantially equal to a diameter of the cylindrical space defined in the chamber body, and each of the proximal end and the distal end of an inserted portion has a diameter smaller than the diameter of the extension portion,   wherein in the movement of the cylinder, the proximal sealing ring is compressed by a cylindrical inner wall of the chamber body to have a diameter substantially equal to a diameter of the cylindrical space of the chamber body,   wherein the actuation mechanism further includes a distal sealing ring coupled to the insertable cylinder, wherein the distal sealing ring slides along and on the cylindrical inner wall of the chamber body when the insertable cylinder moves from the first direction to the second direction or from the second direction to the first direction,   wherein the distal sealing ring is engaged with the distal end of the inserted portion of the insertable cylinder, wherein the distal sealing ring further projects outwardly beyond the diameter of the extension portion between the proximal and distal ends of the inserted portion of the insertable cylinder,   wherein, in the movement of the cylinder, the distal sealing ring is compressed by the inner wall of the chamber body to have a diameter substantially the same as the diameter of the cylindrical space of the chamber body.   
     
     
         14 . The dispenser of  claim 9 , further comprising a compressing member disposed in the main inner space of the elongate main body, wherein the compressing member is configured to divide the main inner space into a first inner sub-space and a second inner sub-space, wherein a cosmetic-fluid is stored in the first inner sub-space defined between the compressing member and the fluid-communication chamber,
 wherein when the external force applied to the actuation mechanism is released such that a cosmetic fluid of the first volume from the cosmetic fluid stored in the first inner sub-space passes through the hollow fluid inlet guide and the fluid-inlet hole into the cylindrical space, the compressing member is displaced in a sliding manner along and on an inner face of the elongate main body such that a volume of the first inner sub-space is reduced by the first volume,   wherein the dispenser further comprises a sealing cap passing through and sealing the second end of the elongate main body,   wherein the second inner sub-space is defined between the compressing member and the sealing cap,   wherein when a volume of the first inner sub-space is reduced by the first volume, a volume of the second inner sub-space is expanded by the first volume,   wherein the sealing cap has an air-communication hole defined therein, wherein the air-communication hole allows air-communication between the second inner sub-space and an exterior space of the cosmetic-fluid dispenser,   wherein the air-communication hole defines a channel through which, when the second inner sub-space is expanded by the first volume, an outside air of the same volume as the first volume flows into the second inner sub-space.   
     
     
         15 . The dispenser of  claim 9 , wherein the distal cosmetic-fluid outlet structure includes:
 an outlet hole formed in a downstream region thereof for discharging a cosmetic-fluid; and   an inserted portion formed in an upstream region thereof and inserted into a distal end of the cosmetic-fluid outlet guide,   wherein when the inserted portion is inserted into the distal end of the cosmetic-fluid outlet guide, a spacing is defined between an outer peripheral surface of the inserted portion and an inner peripheral surface of the cosmetic-fluid outlet guide,   wherein the inserted portion has a first inserted sub-portion, a second inserted sub-portion, and a hole-opening/closing member,   wherein the first inserted sub-portion defines therein a first fluid-communication channel in fluid-communication with the outlet hole, wherein the first inserted sub-portion has a first fluid-communication hole defined therein to allow fluid-communication between the first fluid-communication channel and the spacing,   wherein the second inserted sub-portion defines therein a second fluid-communication channel in fluid-communication with the fluid-outlet hole, wherein the second inserted sub-portion has a second fluid-communication hole defined therein to allow fluid-communication between the second fluid-communication channel and the spacing,   wherein the hole-opening/closing member is constructed to surround the second fluid-communication hole and to control flow of a cosmetic-fluid through the second fluid-communication hole.   
     
     
         16 . The dispenser of  claim 15 , wherein when an external force is applied to the actuation mechanism, the hole-opening/closing member is elastically deformed via a pressure generated by a cosmetic-fluid moving toward the distal end of a cosmetic-fluid outlet guide through the fluid-outlet hole, thereby to open the second fluid-communication hole,
 wherein when the external force applied to the actuation mechanism is released such that the pressure is weakened, the hole-opening/closing member is restored by an elastic restoring force, thereby to close the second fluid-communication hole.   
     
     
         17 . The dispenser of  claim 9 , wherein a removable cosmetic-fluid storage unit is removably received in the main inner space of the main body, wherein the removable cosmetic-fluid storage unit includes:
 a removable elongate body having an elongate inner space therein, wherein the removable elongate body is removably inserted into the inner space of the elongate main body;   a compressing member disposed in the elongate inner space to divide the elongate inner space of the removable elongate body into a first inner sub-space and a second inner sub-space; and   a sealing cap configured to seal the inner space of the removable elongate body and the second end of the elongate main body,   wherein a cosmetic-fluid is stored in the first inner sub-space defined between the compressing member and the chamber body of the fluid-communication chamber,   wherein when the external force applied to the actuation mechanism is released so that a cosmetic-fluid of the first-volume from a cosmetic-fluid stored in the first inner sub-space passes through the fluid-inlet hole into the cylindrical space of the chamber body, the compressing member is displaced in a sliding manner along and on an inner face of the removable elongate body so that a volume of the first inner sub-space is reduced by the first volume.   
     
     
         18 . The dispenser of  claim 9 , wherein the distal cosmetic-fluid outlet structure includes:
 an outlet hole formed in a downstream region thereof for discharging a cosmetic-fluid; and   an inserted portion formed in an upstream region thereof and inserted into a distal end of the cosmetic-fluid outlet guide,   wherein the outlet hole has an elliptical-shaped cross-section,   wherein an inner diameter of a distal end portion of the cosmetic-fluid outlet guide is larger than an inner diameter of a middle extension portion of the cosmetic-fluid outlet guide, wherein the inserted portion of the distal cosmetic-fluid outlet structure is inserted into the distal end portion of the cosmetic-fluid outlet guide.   
     
     
         19 . The dispenser of  claim 18 , further comprising:
 a second elastic member disposed between an outer peripheral surface of the inserted portion of the distal cosmetic-fluid outlet structure, and an inner peripheral surface of the distal end portion of the cosmetic-fluid outlet guide; and   an outlet-control ball disposed at a proximal end of the second elastic member, wherein the outlet-control ball has a larger diameter than a diameter of the middle extension portion of the cosmetic-fluid outlet guide.   
     
     
         20 . The dispenser of  claim 19 , wherein when an external force is applied to the actuation mechanism, the outlet-control ball is subjected to a pressure generated by the cosmetic-fluid moving toward the distal end of the cosmetic-fluid outlet guide through the fluid-outlet hole, and, thus, is moved in a third direction, wherein the third direction is perpendicular to the first direction or second direction, wherein the third direction is a direction going away from the cylindrical space,
 wherein when the pressure generated by the cosmetic-fluid is weakened, the outlet-control ball is moved by the second elastic member in a fourth direction opposite to the third direction, thereby to close a further inlet hole defined in a boundary region between the distal end portion and the middle extension portion of the cosmetic-fluid outlet guide.   
     
     
         21 . A cosmetic-fluid dispenser comprising:
 an elongate main body having a cosmetic-fluid storage space defined therein to contain cosmetic fluid therein, wherein the elongate main body has a chamber body portion;   a fluid-communication chamber defined in the chamber body portion in a first direction, wherein the first direction is a direction perpendicular to a longitudinal direction of the elongate main body;   an actuation mechanism at least partially hollowed and insertable into the fluid-communication chamber, wherein a top thereof protrudes outside the fluid-communication chamber, and a bottom thereof is received in the fluid-communication chamber, and has a bottom inlet hole defined therein;   a first vertical elastic hollow member having a lower end disposed on a bottom face of the fluid communication chamber, wherein at least a portion of an upper portion thereof is inserted into the actuation mechanism through the bottom inlet hole;   a first fluid communication channel defined in the chamber body portion in a direction away from the cosmetic-fluid storage space;   a second fluid communication channel defined in the chamber body portion to fluid-communicate with the cosmetic-fluid storage space; and   a cosmetic-fluid outlet structure configured to communicate with the first fluid communication channel, wherein the cosmetic-fluid outlet structure has a fluid discharging hole defined in a distal end thereof and exposed to an outside of the dispenser,   wherein a top of the chamber body portion has a first round concaved top portion having an opening defined therein through which the actuation mechanism passes into the chamber,   wherein an outer face of the top of the actuation mechanism has a shape conformal to a round concaved shape of the round concaved top portion.   
     
     
         22 . The cosmetic-fluid dispenser of  claim 21 , wherein the cosmetic-fluid dispenser further comprise:
 an inner cap coupled to one longitudinal end of the elongate main body, the inner cap having a second round concaved top portion corresponding in position to the first round concaved top and having a shape conformal to the shape of the first round concaved top portion, wherein the second round concaved top portion has an opening defined therein through which the actuation mechanism passes into the chamber;   an outer cap having a receiving space for receiving the distal cosmetic-fluid outlet structure, wherein the outer cap is removably engaged with the inner cap, wherein the receiving space is defined as a cylindrical hollow inner space for partially receiving the inner cap.   
     
     
         23 . The cosmetic-fluid dispenser of  claim 21 , wherein each of the first and second fluid communication channels extends in a second direction, wherein the second direction is the longitudinal direction of the elongate main body,
 wherein a hollow cylindrical tube has an inner diameter greater than an diameter of the second fluid communication channel, and the hollow cylindrical tube protrudes from an outer face of the chamber body portion into the fluid storage space defined in the main body,   wherein a hollow cover portion is partially fitted into the hollow cylindrical tube and has a first opening defined at a proximal end thereof communicating with the second fluid communication channel, and has a second opening defined at a distal end thereof communicating with the fluid storage space,   wherein closing/opening means is configured to reversibly open and close the second opening defined in the cover portion, wherein the closing/opening means is disposed in the cover portion and is movable,   wherein a closing/opening means stopper has an annular shape and protrudes inwardly from an inner circumference of the cover portion to limit movement of the closing/opening means.   
     
     
         24 . The cosmetic-fluid dispenser of  claim 23 , wherein the cover portion has an outer portion disposed out of the hollow cylindrical tube, wherein the outer portion defines the second opening defined therein, wherein the outer portion has a hollow truncated conical shape. 
     
     
         25 . The cosmetic-fluid dispenser of  claim 24 , wherein the hollow cylindrical tube has an annular groove defined in the inner face thereof while the cover portion has an annular protrusion defined on an outer face thereof, wherein the annular protrusion is engaged into the annual groove; alternatively,
 the hollow cylindrical tube has an annular protrusion defined on the inner face thereof while the cover portion has an annular groove defined in an outer face thereof, wherein the annular protrusion is engaged into the annual groove; and   wherein the inner space of the hollow cylindrical tube is configured to fluid-communicate with the second fluid communication channel and to fluid-communicate with the second opening of the cover portion.   
     
     
         26 . The cosmetic-fluid dispenser of  claim 21 , wherein the first elastic member is configured such that elastic deformation of the first elastic member allows up and down movements of the actuation mechanism to be reversible,
 wherein when an external force is applied to the actuation mechanism, a first volume of cosmetic fluid contained in the fluid-communication chamber flows through the first fluid communication channel into the cosmetic-fluid outlet structure,   wherein when the external force applied to the actuation mechanism is released, cosmetic fluid of an amount equal to the first volume flows from the cosmetic-fluid storage space through the second fluid communication channel into the fluid-communication chamber.   
     
     
         27 . The cosmetic-fluid dispenser of  claim 26 , wherein the actuation mechanism includes:
 a hollow piston portion formed in a cylindrical shape to be inserted into the fluid-communication chamber, wherein the hollow piston portion has a bottom inlet hole defined in a bottom portion thereof, wherein the hollow piston portion has a fluid receiving space defined therein;   a head support portion extending upward from the hollow piston portion, wherein the head support portion has an outer diameter smaller than an outer diameter of the hollow piston portion and is formed in a cylindrical shape and has a hole defined in a top portion thereof;   a head including: a pressed portion to which external force is applied and which is exposed out of the fluid-communication chamber; and an inserted rib which extends from a bottom of the pressed portion and is inserted into the hole defined in the head support portion; and   First and second sealing rings spaced apart from each other in a vertical direction and disposed around an outer surface of the hollow piston portion.   
     
     
         28 . The cosmetic-fluid dispenser of  claim 27 , wherein the hollow piston portion has first and second lateral through-holes defined therein in opposite lateral points of the hollow piston portion respectively, wherein the first and second lateral through-holes communicate with the bottom inlet hole and the inner receiving space of the hollow piston portion, wherein the first and second lateral through-holes communicate with the first and second fluid communication channels respectively,
 wherein the first sealing ring surrounds a lower portion of an outer periphery of the hollow piston portion, while the second sealing ring surrounds an upper portion of the outer periphery of the hollow piston portion,   wherein both of the first and second lateral through-holes are defined between the first and second sealing rings in a vertical direction, wherein each of the first and second lateral through-holes extends horizontally.   
     
     
         29 . The cosmetic-fluid dispenser of  claim 28 , wherein the first fluid communication channel communicates with the fluid outlet structure, wherein the second fluid communication channel communicates with the fluid storage space defined in the main body,
 wherein each of the first and second fluid communication channels extends in a second direction, wherein the second direction is the longitudinal direction of the elongate main body,   wherein when external force is applied to the actuation mechanism, the first elastic member is compressed in a compressed mode such that the piston portion is lowered, and, thus, cosmetic fluid contained within the inner fluid receiving space of the hollow piston portion flows through the first lateral through-hole and then through the first fluid communication channel, wherein at the compressed mode, the first fluid communication channel and the second fluid communication channel are positioned between the first and the second sealing rings at a height level thereof,   wherein when the external force applied to the actuation mechanism is released, the first elastic member is restored at a restored mode such that the piston portion rises up in the fluid-communication chamber, and, thus, cosmetic fluid flows from the fluid storage space of the main body through the second fluid communication channel and then the second lateral through-hole into the inner fluid receiving space of the hollow piston portion.   
     
     
         30 . The cosmetic-fluid dispenser of  claim 29 , wherein when the piston portion is lowered down or raised up, the first sealing ring slides along an inner circumferential face of the fluid-communication chamber,
 wherein when the piston portion is lowered down or raised up, the second sealing ring slides along an inner circumferential face of the fluid-communication chamber to prevent the cosmetic fluid contained in the fluid-communication chamber from flowing out of the fluid-communication chamber,   wherein the first and second sealing rings are spaced apart from each other in a vertical direction, thereby preventing air from flowing into the fluid-communication chamber.   
     
     
         31 . The cosmetic-fluid dispenser of  claim 21 , wherein the cosmetic-fluid dispenser comprises an elongate fluid-supply tube detachably inserted into the inner space of the elongate main body, wherein the elongate fluid-supply tube has an elongate inner space defined therein,
 wherein the inner space of the elongate fluid-supply tube is partitioned into a first inner sub-space and a second inner sub-space, wherein volumes of the first inner sub-space and the second inner sub-space vary reversibly in a complementary manner to each other, wherein the first inner sub-space contains therein the cosmetic fluid to be delivered into the fluid-communication chamber, while the second sub-space contains therein air flowing from an outside of the dispenser,   wherein when external force applied to the actuation mechanism is released, a first volume of cosmetic-fluid stored in the first inner sub-space passes through the second fluid-communication channel into the fluid communication chamber, and, at the same time, the volume of the first inner sub-space is reduced by the first volume while the volume of the second inner sub-space is expanded by the first volume.   
     
     
         32 . The cosmetic-fluid dispenser of  claim 31 , wherein an O-ring is provided on an outer face of a first longitudinal end of the cosmetic elongate fluid-supply tube, while an annular groove into which the O-ring is seated is defined in an inner face of the elongate main body such that the cosmetic elongate fluid-supply tube and the elongate main body are tightly coupled to each other, wherein the first longitudinal end faces the chamber body portion,
 wherein a second longitudinal end of the cosmetic elongate fluid-supply tube is air-tightly blocked by a blocking portion having an air communication channel defined therein.   
     
     
         33 . The cosmetic-fluid dispenser of  claim 31 , wherein the cosmetic-fluid dispenser comprises an elongate fluid-supply tube detachably inserted into the inner space of the elongate main body, wherein the elongate fluid-supply tube has an elongate inner space defined therein, wherein the inner space of the elongate fluid-supply tube is partitioned into a first inner sub-space and a second inner sub-space by a compressing member, wherein volumes of the first inner sub-space and the second inner sub-space vary reversibly in a complementary manner to each other, wherein the first inner sub-space contains therein the cosmetic fluid to be delivered into the fluid-communication chamber, while the second sub-space contains therein air flowing from an outside of the dispenser,
 wherein the cosmetic elongate fluid-supply tube has a first longitudinal end facing the chamber body portion, wherein the cosmetic elongate fluid-supply tube has a sealing cap defining a second longitudinal end of the cosmetic elongate fluid-supply tube, wherein the second longitudinal end is opposite the first longitudinal end, wherein the sealing cap is tightly inserted into an opening in the second longitudinal end,   wherein the sealing cap has an air communication channel defined therein communicating with the second inner sub-space,   wherein the second inner sub-space is defined between the compressing member and the sealing cap,   wherein the volume of the first inner sub-space is reduced by a first volume via movement of the compressing member toward the first longitudinal end together with compressing the fluid in the first sub-space while the volume of the second inner sub-space is forcedly expanded by the first volume via the air-communication hole allowing air-communication between the second inner sub-space and an exterior space of the cosmetic-fluid dispenser.   
     
     
         34 . The cosmetic-fluid dispenser of  claim 22 , wherein the cosmetic-fluid outlet structure includes:
 a distal portion defining a downstream portion of the cosmetic-fluid outlet structure, wherein the distal portion has a fluid discharging hole in a tip end thereof for discharging the cosmetic-fluid, wherein the fluid discharging hole is out of the inner cap; and   a proximal portion defining an upstream portion of the cosmetic-fluid outlet structure, wherein the proximal portion is inserted into an inner elongate space defined in the inner cap,   wherein the proximal portion has a first inserted portion connecting the distal portion and a second inserted portion facing the first fluid communication channel, wherein a blocking partition is formed between the first and second inserted portions,   wherein an elongate spacing is defined between an outer face of the proximal portion and an inner face of the inner elongate space defined in the inner cap,   wherein a first fluid-communication space is defined in the first inserted portion to be in communication with the fluid discharging hole,   wherein the first inserted portion has a first hole defined therein for fluid communication between the first fluid-communication space and the elongate spacing,   wherein the second inserted portion has a second fluid-communication space defined therein in communication with the first fluid communication channel,   wherein the second inserted portion has a second hole defined therein for fluid-communication between the second fluid-communication space and the elongate spacing,   wherein hole closing/opening means is disposed in the elongate spacing and is configured to open or close the second hole to control flow of the cosmetic fluid through the second hole.   
     
     
         35 . The cosmetic-fluid dispenser of  claim 34 , wherein when the external force is applied to the actuation mechanism, the hole closing/opening means is elastically deformed by a pressure resulting from the cosmetic fluid moving from the fluid communication chamber toward a distal end of the first fluid communication channel, thereby to open the second hole,
 wherein when the pressure is deactivated, the hole closing/opening means is elastically restored via a restoring force thereof, thereby to close the second hole.   
     
     
         36 . The cosmetic-fluid dispenser of  claim 22 , wherein the cosmetic-fluid outlet structure includes:
 a distal portion defining a downstream portion of the cosmetic-fluid outlet structure, wherein the distal portion has a fluid discharging hole in a tip end thereof for discharging the cosmetic-fluid, wherein the fluid discharging hole is out of the inner cap; and   a proximal portion defining an upstream portion of the cosmetic-fluid outlet structure, wherein the proximal portion is hollow and is inserted into an inner elongate slot defined in the inner cap,   wherein the inner elongate slot communicates with the first fluid communication channel, and the inner elongate slot has an inner diameter larger than an inner diameter of the first fluid communication channel,   wherein a fluid-outlet adjustment ball is movably disposed in the hollow proximal end toward a distal end of the first fluid communication channel, wherein the fluid-outlet adjustment ball has a diameter greater than an inner diameter of the first fluid communication channel,   wherein a second elastic member is disposed in the hollow proximal end in a downstream region of the fluid-outlet adjustment ball.   
     
     
         37 . The cosmetic-fluid dispenser of  claim 36 , wherein when the external force is applied to the actuation mechanism, the cosmetic fluid contained in the fluid communication chamber moves through the first fluid communication channel toward the elongate slot to forcedly move the fluid-outlet adjustment ball toward the fluid discharging hole, thereby to compress the second elastic member, thereby to allow the cosmetic fluid to be discharged through the fluid discharging hole,
 wherein when the cosmetic fluid depressurizes the fluid-outlet adjustment ball, the fluid-outlet adjustment ball moves to close the distal end of the first fluid communication channel via a restoring force of the second elastic member.   
     
     
         38 . A cosmetic-fluid dispenser comprising:
 an elongate main body having a cosmetic-fluid storage space defined therein to contain cosmetic fluid therein, wherein the elongate main body has a chamber body portion;   a fluid-communication chamber defined in the chamber body portion in a first direction, wherein the first direction is a direction perpendicular to a longitudinal direction of the elongate main body;   an actuation mechanism at least partially hollowed and insertable into the fluid-communication chamber, wherein a top thereof protrudes outside the fluid-communication chamber, and a bottom thereof is received in the fluid-communication chamber, and has a bottom inlet hole defined therein;   a first vertical elastic hollow member extending along and surrounding an upper portion of the actuation mechanism, wherein the first vertical elastic hollow member allows reversible vertical movement of the actuation mechanism;   a first fluid communication channel defined in the chamber body portion in a direction away from the cosmetic-fluid storage space;   a second fluid communication channel defined in the chamber body portion to fluid-communicate with the cosmetic-fluid storage space; and   a cosmetic-fluid outlet structure configured to communicate with the first fluid communication channel, wherein the cosmetic-fluid outlet structure has a fluid discharging hole defined in a distal end thereof and exposed to an outside of the dispenser,   wherein a top of the chamber body portion has a first round concaved top portion having an opening defined therein through which the actuation mechanism passes into the chamber,   wherein an outer face of the top of the actuation mechanism has a shape conformal to a round concaved shape of the round concaved top portion,   wherein the actuation mechanism includes:   a hollow piston portion formed in a cylindrical shape to be inserted into the fluid-communication chamber, wherein the hollow piston portion has the bottom inlet hole defined in a bottom portion thereof, wherein the hollow piston portion has a fluid receiving space defined therein;   a head support portion extending upward from the hollow piston portion and having an outer diameter smaller than an outer diameter of the hollow piston portion; and   a head supported by the head support portion, wherein the first vertical elastic hollow member has a top end contacting the head.   
     
     
         39 . The cosmetic-fluid dispenser of  claim 38 , wherein the head includes: a pressed portion to which an external force is applied and which is exposed out of the fluid-communication chamber; and an inserted rib extending downwards from a bottom of the pressed portion,
 wherein the pressed portion includes:   a cap-shaped portion being circular in a cross section and being open at a bottom thereof, and being hollow and having a blocked top; and   an annular rib protruding outward along a rim of a bottom end of the cap-shaped portion, wherein the annular rib defines a bottom opening of the cap-shaped portion and bears against an uppermost inner face of the fluid-communication chamber,   wherein the inserted rib protrudes downward from an inner central position of the cap-shaped portion,   wherein a first engaging protrusion protrudes horizontally from an outer face of the inserted rib, wherein the head support portion has a rib receiving hole defined in a top thereof through which the inserted rib is inserted,   wherein a first engaged groove is defined radially outwards in an inner face of the rib receiving hole and receives therein the first engaging protrusion.   
     
     
         40 . The cosmetic-fluid dispenser of  claim 39 , wherein the actuation mechanism includes first and second sealing rings spaced apart from each other in a vertical direction, wherein the first and second sealing rings are disposed around an outer surface of the hollow piston portion,
 wherein the hollow piston portion has first and second lateral through-holes defined therein in opposite lateral points of the hollow piston portion respectively, wherein the first and second lateral through-holes communicate with the bottom inlet hole and the inner receiving space of the hollow piston portion, wherein the first and second lateral through-holes communicate with the first and second fluid communication channels respectively,   wherein both of the first and second lateral through-holes are defined between the first and second sealing rings in a vertical direction, wherein each of the first and second lateral through-holes extends horizontally.   
     
     
         41 . The cosmetic-fluid dispenser of  claim 40 , wherein the first fluid communication channel communicates with the fluid outlet structure, wherein the second fluid communication channel communicates with the fluid storage space defined in the main body,
 wherein each of the first and second fluid communication channels extends in a second direction, wherein the second direction is the longitudinal direction of the elongate main body,   wherein when external force is applied to the actuation mechanism, the first elastic member is compressed in a compressed mode such that the piston portion is lowered, and, thus, cosmetic fluid contained within the inner fluid receiving space of the hollow piston portion flows through the first lateral through-hole and then through the first fluid communication channel, wherein at the compressed mode, the first fluid communication channel and the second fluid communication channel are positioned between the first and the second sealing rings at a height level thereof,   wherein when the external force applied to the actuation mechanism is released, the first elastic member is restored at a restored mode such that the piston portion rises up in the fluid-communication chamber, and, thus, cosmetic fluid flows from the fluid storage space of the main body through the second fluid communication channel and then the second lateral through-hole into the inner fluid receiving space of the hollow piston portion.   
     
     
         42 . The cosmetic-fluid dispenser of  claim 41 , wherein when the piston portion is lowered down or raised up, the first sealing ring slides along an inner circumferential face of the fluid-communication chamber,
 wherein when the piston portion is lowered down or raised up, the second sealing ring slides along an inner circumferential face of the fluid-communication chamber to prevent the cosmetic fluid contained in the fluid-communication chamber from flowing out of the fluid-communication chamber,   wherein the first and second sealing rings are spaced apart from each other in a vertical direction, thereby preventing air from flowing into the fluid-communication chamber.   
     
     
         43 . The cosmetic-fluid dispenser of  claim 41 , wherein each of the first and second fluid communication channels extends in a second direction, wherein the second direction is the longitudinal direction of the elongate main body,
 wherein a hollow cylindrical tube has an inner diameter greater than an diameter of the second fluid communication channel, and the hollow cylindrical tube protrudes from an outer face of the chamber body portion into the fluid storage space defined in the main body,   wherein a hollow cover portion is partially fitted into the hollow cylindrical tube and has a first opening defined at a proximal end thereof communicating with the second fluid communication channel, and has a second opening defined at a distal end thereof communicating with the fluid storage space,   wherein closing/opening means is configured to reversibly open and close the second opening defined in the cover portion, wherein the closing/opening means is disposed in the cover portion and is movable,   wherein a closing/opening means stopper has an annular shape and protrudes inwardly from an inner circumference of the cover portion to limit movement of the closing/opening means.   
     
     
         44 . The cosmetic-fluid dispenser of  claim 41 , wherein the fluid communication chamber has an upper portion and a lower portion, wherein the upper portion thereof has a larger diameter than the lower portion, wherein a spacing is defined between the first elastic member and an inner wall face of the upper portion of the fluid communication chamber. 
     
     
         45 . The cosmetic-fluid dispenser of  claim 44 , wherein a hollow cylindrical portion further upwards extends from an upper portion of the hollow piston portion, wherein the hollow cylindrical portion has a lower portion surrounding the upper portion of the hollow piston portion, wherein the hollow cylindrical portion is disposed in the upper portion of the fluid communication chamber. 
     
     
         46 . The cosmetic-fluid dispenser of  claim 43 , wherein the cover portion has an outer portion disposed out of the hollow cylindrical tube, wherein the outer portion defines the second opening defined therein, wherein the outer portion has a hollow truncated conical shape. 
     
     
         47 . The cosmetic-fluid dispenser of  claim 46 , wherein the hollow cylindrical tube has an annular groove defined in the inner face thereof while the cover portion has an annular protrusion defined on an outer face thereof, wherein the annular protrusion is engaged into the annual groove; alternatively,
 the hollow cylindrical tube has an annular protrusion defined on the inner face thereof while the cover portion has an annular groove defined in an outer face thereof, wherein the annular protrusion is engaged into the annual groove; and   wherein the inner space of the hollow cylindrical tube is configured to fluid-communicate with the second fluid communication channel and to fluid-communicate with the second opening of the cover portion.   
     
     
         48 . The cosmetic-fluid dispenser of  claim 41 , wherein each of the first and second fluid communication channels extends in a second direction, wherein the second direction is the longitudinal direction of the elongate main body,
 wherein a hollow cylindrical tube has an inner diameter greater than an diameter of the second fluid communication channel, and the hollow cylindrical tube protrudes from an outer face of the chamber body portion into the fluid storage space defined in the main body,   wherein a hollow cover portion is partially fitted into the hollow cylindrical tube and has a first opening defined at a proximal end thereof communicating with the second fluid communication channel, and has a second opening defined at a distal end thereof communicating with the fluid storage space, wherein an inner diameter of the cover portion decreases gradually from the first opening thereof to the second opening thereof,   wherein a closing/opening ball is configured to reversibly open and close the second opening defined in the cover portion, wherein the ball is disposed in the cover portion and is movable,   wherein a spring is disposed in the cover portion and is configured to push the ball toward the second opening.   
     
     
         49 . The cosmetic-fluid dispenser of  claim 48 , wherein the hollow cylindrical tube has an annular groove defined in the inner face thereof while the cover portion has an annular protrusion defined on an outer face thereof, wherein the annular protrusion is engaged into the annual groove; alternatively,
 the hollow cylindrical tube has an annular protrusion defined on the inner face thereof while the cover portion has an annular groove defined in an outer face thereof, wherein the annular protrusion is engaged into the annual groove; and   wherein the inner space of the hollow cylindrical tube is configured to fluid-communicate with the second fluid communication channel and to fluid-communicate with the second opening of the cover portion.   
     
     
         50 . The cosmetic-fluid dispenser of  claim 38 , wherein the dispenser comprises:
 an inner cap coupled to one longitudinal end of the elongate main body, the inner cap having a second round concaved top portion corresponding in position to the first round concaved top and having a shape conformal to the shape of the first round concaved top portion, wherein the second round concaved top portion has an opening defined therein through which the actuation mechanism passes into the chamber;   an outer cap having a receiving space for receiving the distal cosmetic-fluid outlet structure, wherein the outer cap is removably engaged with the inner cap, wherein the receiving space is defined as a cylindrical hollow inner space for partially receiving the inner cap.   
     
     
         51 . The cosmetic-fluid dispenser of  claim 41 , wherein the first elastic member is configured such that elastic deformation of the first elastic member allows up and down movements of the actuation mechanism to be reversible,
 wherein when an external force is applied to the actuation mechanism, a first volume of cosmetic fluid contained in the fluid-communication chamber flows through the first fluid communication channel into the cosmetic-fluid outlet structure,   wherein when the external force applied to the actuation mechanism is released, cosmetic fluid of an amount equal to the first volume flows from the cosmetic-fluid storage space through the second fluid communication channel into the fluid-communication chamber.   
     
     
         52 . The cosmetic-fluid dispenser of  claim 41 , wherein the cosmetic-fluid dispenser comprises an elongate fluid-supply tube detachably inserted into the inner space of the elongate main body, wherein the elongate fluid-supply tube has an elongate inner space defined therein,
 wherein the inner space of the elongate fluid-supply tube is partitioned into a first inner sub-space and a second inner sub-space, wherein volumes of the first inner sub-space and the second inner sub-space vary reversibly in a complementary manner to each other, wherein the first inner sub-space contains therein the cosmetic fluid to be delivered into the fluid-communication chamber, while the second sub-space contains therein air flowing from an outside of the dispenser,   wherein when external force applied to the actuation mechanism is released, a first volume of cosmetic-fluid stored in the first inner sub-space passes through the second fluid-communication channel into the fluid communication chamber, and, at the same time, the volume of the first inner sub-space is reduced by the first volume while the volume of the second inner sub-space is expanded by the first volume.   
     
     
         53 . The cosmetic-fluid dispenser of  claim 38 , wherein the cosmetic-fluid dispenser comprises an elongate fluid-supply tube detachably inserted into the inner space of the elongate main body, wherein the elongate fluid-supply tube has an elongate inner space defined therein, wherein the inner space of the elongate fluid-supply tube is partitioned into a first inner sub-space and a second inner sub-space by a compressing member, wherein volumes of the first inner sub-space and the second inner sub-space vary reversibly in a complementary manner to each other, wherein the first inner sub-space contains therein the cosmetic fluid to be delivered into the fluid-communication chamber, while the second sub-space contains therein air flowing from an outside of the dispenser,
 wherein the cosmetic elongate fluid-supply tube has a first longitudinal end facing the chamber body portion, wherein the cosmetic elongate fluid-supply tube has a sealing cap defining a second longitudinal end of the cosmetic elongate fluid-supply tube, wherein the second longitudinal end is opposite the first longitudinal end, wherein the sealing cap is tightly inserted into an opening in the second longitudinal end,   wherein the sealing cap has an air communication channel defined therein communicating with the second inner sub-space,   wherein the second inner sub-space is defined between the compressing member and the sealing cap,   wherein the volume of the first inner sub-space is reduced by a first volume via movement of the compressing member toward the first longitudinal end together with compressing the fluid in the first sub-space while the volume of the second inner sub-space is forcedly expanded by the first volume via the air-communication hole allowing air-communication between the second inner sub-space and an exterior space of the cosmetic-fluid dispenser.   
     
     
         54 . The cosmetic-fluid dispenser of  claim 52 , wherein an O-ring is provided on an outer face of a first longitudinal end of the cosmetic elongate fluid-supply tube, while an annular groove into which the O-ring is seated is defined in an inner face of the elongate main body such that the cosmetic elongate fluid-supply tube and the elongate main body are tightly coupled to each other, wherein the first longitudinal end faces the chamber body portion,
 wherein a second longitudinal end of the cosmetic elongate fluid-supply tube is air-tightly blocked by a blocking portion having an air communication channel defined therein.   
     
     
         55 . The cosmetic-fluid dispenser of  claim 38 , wherein the cosmetic-fluid outlet structure includes:
 a distal portion defining a downstream portion of the cosmetic-fluid outlet structure, wherein the distal portion has a fluid discharging hole in a tip end thereof for discharging the cosmetic-fluid, wherein the fluid discharging hole is out of the inner cap; and   a proximal portion defining an upstream portion of the cosmetic-fluid outlet structure, wherein the proximal portion is inserted into an inner elongate space defined in the inner cap,   wherein the proximal portion has a first inserted portion connecting the distal portion and a second inserted portion facing the first fluid communication channel, wherein a blocking partition is formed between the first and second inserted portions,   wherein an elongate spacing is defined between an outer face of the proximal portion and an inner face of the inner elongate space defined in the inner cap,   wherein a first fluid-communication space is defined in the first inserted portion to be in communication with the fluid discharging hole,   wherein the first inserted portion has a first hole defined therein for fluid communication between the first fluid-communication space and the elongate spacing,   wherein the second inserted portion has a second fluid-communication space defined therein in communication with the first fluid communication channel,   wherein the second inserted portion has a second hole defined therein for fluid-communication between the second fluid-communication space and the elongate spacing,   wherein hole closing/opening means is disposed in the elongate spacing and is configured to open or close the second hole to control flow of the cosmetic fluid through the second hole.   
     
     
         56 . The cosmetic-fluid dispenser of  claim 55 , wherein when the external force is applied to the actuation mechanism, the hole closing/opening means is elastically deformed by a pressure resulting from the cosmetic fluid moving from the fluid communication chamber toward a distal end of the first fluid communication channel, thereby to open the second hole,
 wherein when the pressure is deactivated, the hole closing/opening means is elastically restored via a restoring force thereof, thereby to close the second hole.   
     
     
         57 . The cosmetic-fluid dispenser of  claim 55 , wherein the cosmetic-fluid outlet structure includes:
 a distal portion defining a downstream portion of the cosmetic-fluid outlet structure, wherein the distal portion has a fluid discharging hole in a tip end thereof for discharging the cosmetic-fluid, wherein the fluid discharging hole is out of the inner cap; and   a proximal portion defining an upstream portion of the cosmetic-fluid outlet structure, wherein the proximal portion is hollow and is inserted into an inner elongate slot defined in the inner cap,   wherein the inner elongate slot communicates with the first fluid communication channel, and the inner elongate slot has an inner diameter larger than an inner diameter of the first fluid communication channel,   wherein a fluid-outlet adjustment ball is movably disposed in the hollow proximal end toward a distal end of the first fluid communication channel, wherein the fluid-outlet adjustment ball has a diameter greater than an inner diameter of the first fluid communication channel,   wherein a second elastic member is disposed in the hollow proximal end in a downstream region of the fluid-outlet adjustment ball.   
     
     
         58 . The cosmetic-fluid dispenser of  claim 57 , wherein when the external force is applied to the actuation mechanism, the cosmetic fluid contained in the fluid communication chamber moves through the first fluid communication channel toward the elongate slot to forcedly move the fluid-outlet adjustment ball toward the fluid discharging hole, thereby to compress the second elastic member, thereby to allow the cosmetic fluid to be discharged through the fluid discharging hole,
 wherein when the cosmetic fluid depressurizes the fluid-outlet adjustment ball, the fluid-outlet adjustment ball moves to close the distal end of the first fluid communication channel via a restoring force of the second elastic member.