Hair removal device

Abstract

A hair removal device includes a main control board and a light source assembly. The light source assembly comprises a light source electrically connected to the main control board, a reflector housing the light source and providing a light outlet, and a lens located in front of the light source within the reflector. A head of the device is provided with a light window; the reflector has a parabolic inner wall; the light source is located on a focus line of the parabolic inner wall of the reflector; and an optical path of the hair removal device is that: light generated by the light source is reflected by the parabolic inner wall of the reflector or refracted by the lens to form a parallel light beam, and the parallel light beam is emitted through the light outlet toward the light window, irradiating skin outside the light window.

What is claimed is: 
     
         1 . A hair removal device comprising:
 a main control board; and   a light source assembly, comprising:
 a light source electrically connected to the main control board; 
 a reflector housing the light source and providing a light outlet; and 
 a lens located in front of the light source within the reflector; 
   wherein a head of the device is provided with a light window; the reflector has a parabolic inner wall; the light source is located on a focus line of the parabolic inner wall; and an optical path of the hair removal device is that: light generated by the light source is reflected by the parabolic inner wall of the reflector or refracted by the lens to form a parallel light beam, and the parallel light beam is emitted through the light outlet toward the light window, irradiating skin outside the light window.   
     
     
         2 . The hair removal device of  claim 1 , wherein the light source is a halogen lamp. 
     
     
         3 . The hair removal device of  claim 2 , wherein a cross-section of the parabolic inner wall of the reflector corresponds to a parallel light parabola line that light originating from a focus point F on the focus line will be reflected as parallel rays; the halogen lamp is located on the focus line, thereby the light generated by the halogen lamp is incident on the parabolic inner wall, and reflected light is emitted along a central axis of the parallel light parabola line. 
     
     
         4 . The hair removal device of  claim 3 , wherein the parabolic inner wall of the reflector includes an upper part and a lower part relative to the halogen lamp, the upper part and the lower part are symmetric with respect to the central axis of the parallel light parabola line and located on an upper side and a lower side of the halogen lamp, and the lens is located in front of the halogen lamp and between the upper part and the lower part; a height of the lens is adapted to a height of the halogen lamp. 
     
     
         5 . The hair removal device of  claim 4 , wherein the reflector further includes an upper horizontal inner wall and a lower horizontal inner wall; the upper horizontal inner wall extends forward following the upper part, the lower horizontal inner wall extends forward following the lower part of the parabolic inner wall; a light outlet channel inside the reflector is defined between the upper horizontal inner wall and the lower horizontal inner wall; terminals of the upper horizontal inner wall and the lower horizontal inner wall therebetween define the light outlet of the reflector; the upper horizontal inner wall and the lower horizontal inner wall are symmetric with respect to the central axis of the parallel light parabola line and parallel to each other;
 light generated by the halogen lamp directed toward the upper part and the lower part on both sides is reflected, and the reflected light is emitted parallel to the central axis; the light directed toward the lens in a middle is refracted by the lens and emitted parallel to the central axis, thereby the light generated by the halogen lamp is reflected by the parabolic inner wall of the reflector and refracted by the lens to form a concentrated parallel light beam, which is emitted toward the light outlet along the light outlet channel inside the reflector.   
     
     
         6 . The hair removal device of  claim 4 , wherein the reflector comprises an arc-shaped top wall connected between the upper part and a lower part of the parabolic inner wall; the arc-shaped top wall is adapted to the halogen lamp and accommodates a rear side of the halogen lamp; and the reflector is integral. 
     
     
         7 . The hair removal device of  claim 3 , wherein coordinates of each point on the parallel light parabola line are calculated by following equations: 
       
         
           
             
               X 
               = 
               
                 5 
                 ⁢ 
                 T 
               
             
           
         
         
           
             
               Y 
               = 
               
                 
                   sqrt 
                   ⁢ 
                      
                   
                     ( 
                     
                       22 
                       ⁢ 
                       b 
                       ⁢ 
                       5 
                       ⁢ 
                       T 
                     
                     ) 
                   
                 
                 = 
                 
                   sqrt 
                   ⁢ 
                      
                   
                     ( 
                     
                       20 
                       ⁢ 
                       bT 
                     
                     ) 
                   
                 
               
             
           
         
         
           
             
               Z 
               = 
               0 
             
           
         
         wherein: X, Y, Z respectively represent three-dimensional coordinate axes; 5*T represents a variable in the X-axis; the X-axis is located on the central axis; b represents a distance between the focus point F and a directrix P of the parallel light parabola line; an intersection point of the directrix P and the X-axis corresponds to a vertex of the parallel light parabola line, the focus point F is located on the X-axis; and the lens is perpendicular to the X-axis and is vertically symmetric with respect to the X-axis. 
       
     
     
         8 . The hair removal device of  claim 2 , wherein the halogen lamp includes a filament and a transparent lampshade, and the filament is located on the focus line of the parallel light parabola line; electrodes are connected to both ends of the filament, electrode plates are provided at both external ends of the halogen lamp, the electrodes of the filament are respectively electrically connected to the electrode plates, and are electrically connected to the main control board through the electrode plates. 
     
     
         9 . The hair removal device of  claim 2 , wherein the light source assembly further includes an optical filter, and the light generated by the halogen lamp is filtered by the optical filter to obtain light of a predetermined wavelength bands to irradiate the skin. 
     
     
         10 . The hair removal device of  claim 9 , wherein the optical filter is arranged at the light outlet of the reflector, and the optical filter is also used to filter out ultraviolet light contained in a spectrum of the light generated by the halogen lamp. 
     
     
         11 . The hair removal device of  claim 1 , comprising a housing and a fan, wherein the main control board, the light source assembly and the fan are arranged in the housing; the housing is provided with a plurality of vents serving as air inlets and air outlets, and the hair removal device dissipates heat through a first airflow path and/or a second airflow path;
 where the heat dissipation through the first airflow path is performed that: the reflector is provided with an air inlet and an air outlet, which are in airflow communication with a space inside the reflector to form an airflow path of the reflector; the air inlet of the housing, an airflow path of the fan, the airflow path of the reflector, and the air outlet of the housing are in airflow communication to form the first airflow path; when the hair removal device is in operation, under the action of the fan, external air is sucked in from the air inlet of the housing, enters the airflow path of the reflector through the airflow path of the fan, transfers heat of the halogen lamp and the reflector, and then is discharged out through the air outlet of the housing, thereby performing heat dissipation for the halogen lamp inside the reflector;   the heat dissipation through the second airflow path is performed that: a heat sink is connected to the reflector for transferring heat from the reflector and have an airflow path in airflow communication with the airflow path of the fan; the air inlet of the housing, the airflow path of the fan, the airflow path of the reflector's heat sink, and the air outlet of the housing are in airflow communication to form the second airflow path; when the hair removal device is in operation, under the action of the fan, external air is sucked in from the air inlet of the housing, enters the airflow path of the reflector's heat sink through the airflow path of the fan, transfers heat of the halogen lamp and the reflector, and then is discharged out through the air outlet of the housing, thereby performing heat dissipation for the reflector and thus dissipating heat from the halogen lamp.   
     
     
         12 . The hair removal device of  claim 11 , wherein the light window is formed by a transparent part fixed by a front shell of the head; the light window is cooled by a Peltier cooler; the Peltier cooler includes an intermediate layer of alternating p-type and n-type semiconductor pillars, and hot and cold sides at opposite sides of the intermediate layer. 
     
     
         13 . The hair removal device of  claim 12 , wherein the Peltier cooler includes a pair of positive and negative electrodes for electrically connecting a circuit of the Peltier cooler to a main control unit; the Peltier cooler includes a temperature sensor, and the temperature sensor includes positive and negative electrodes, which are connected to the main control unit; the temperature sensor transmits temperature data to the main control unit, and the main control unit controls a power supply to the Peltier cooler according to the temperature data; the temperature sensor is placed inside the Peltier cooler to detect the temperature of the cold side or the hot side, or the temperature sensor is placed outside the Peltier cooler to detect the temperature of external components; the main control unit is integrated on the main control board or provided on an independent control board, and the independent control board is electrically connected to the main control board. 
     
     
         14 . The hair removal device of  claim 12 , wherein the cold side of the Peltier cooler is connected to the light window of the transparent part to cool the light window; or, the transparent part services as the cold side of the Peltier cooler; or, the Peltier cooler is thermally connected to the transparent part through a heat transfer member; the heat transfer member includes one or more of: a heat conduction plate or heat conduction tube made of heat conduction material, a heat pipe, a vapor chamber, a super heat pipe, and a super vapor chamber;
 the hot side of the Peltier cooler is one of a heat conduction plate or heat conduction tube made of heat conduction material, a heat pipe, a vapor chamber, a super heat pipe, and a super vapor chamber.   
     
     
         15 . The hair removal device of  claim 12 , wherein another heat sink is installed in the housing for dissipating heat from the hot side of the Peltier cooler; the heat sink of the Peltier cooler is installed between the air inlet of the housing and the fan, and external air is sucked in through the air inlet of the housing, then flows into an airflow path of the heat sink of the Peltier cooler for transferring heat from the hot side of the Peltier cooler and then flows into the airflow path of the fan, and then merges into the first airflow path and/or the second airflow path.