Speaker Device For Mobile Terminal

Abstract

A speaker device for use in a mobile terminal includes a speaker frame with a speaker unit mounted therein, and a frame cover provided at the rear side of the speaker frame to form a resonance space between the speaker frame and the frame cover. Sound that is output in a forward direction of the speaker unit is emitted to a front space of the speaker frame, and sound that is output to the rear of the speaker unit is emitted through the resonance space. The speaker device provides the resonance space at the rear side of the speaker frame to reinforce the output of midrange and bass tones, thereby reproducing the original sound as accurately as possible. The speaker device enables a user to enjoy vivid sound when reproducing a multimedia file or viewing a digital multimedia broadcast (DMB) program on a small-sized device, such as a mobile terminal.

What is claimed is: 
     
         1 . A speaker device for use in a mobile terminal, comprising:
 a speaker frame with a speaker unit mounted therein; and   a frame cover provided at the rear side of the speaker frame to form a resonance space between the speaker frame and the frame cover,   wherein sound output in a forward direction of the speaker unit is emitted to a front space of the speaker frame, and sound output to the rear of the speaker unit is emitted through the resonance space.   
     
     
         2 . The speaker device according to  claim 1 , further comprising at least one vent hole connecting the front space of the speaker frame and the resonance space. 
     
     
         3 . The speaker device according to  claim 1 , further comprising a duct hole formed at an edge portion of the speaker frame to connect the resonance space to the outside of the speaker frame. 
     
     
         4 . The speaker device according to  claim 3 , further comprising at least one signal cable extending from the speaker unit and passing through the duct hole. 
     
     
         5 . The speaker device according to  claim 1 , wherein the speaker unit comprises
 a yoke disposed approximately at the center of the speaker frame;   a magnetic member attached to the front surface of the yoke and placed in the front space of the speaker frame;   a voice coil disposed around the magnetic member; and a vibration plate disposed in the front space of the speaker frame such that the vibration plate faces the magnetic member and the voice coil.   
     
     
         6 . The speaker device according to  claim 5 , further comprising a protector mounted at the front side of the speaker frame to protect the speaker unit. 
     
     
         7 . The speaker device according to  claim 5 , wherein the speaker unit further comprises a metallic plate disposed on the front surface of the magnetic member to induce a magnetic field to be distributed toward the voice coil. 
     
     
         8 . The speaker device according to  claim 1 , wherein the frame cover has a substantially flat-plate shape. 
     
     
         9 . The speaker device according to  claim 1 , wherein the speaker frame is injection molded and the resonance space has one open side formed by coupling the frame cover to the rear side of the speaker frame. 
     
     
         10 . The speaker device according to  claim 3 , wherein the speaker frame and the frame cover have grooves that face each other and form the duct hole when the frame cover is coupled to the speaker frame. 
     
     
         11 . The speaker device according to  claim 3 , wherein the duct hole is formed at a portion extending in a horizontal direction of the speaker frame. 
     
     
         12 . A speaker device for use in a mobile terminal, comprising:
 a speaker frame with a speaker unit mounted therein, and a front space being formed in the speaker frame;   a frame cover connected to the speaker frame to form a resonance space between the speaker frame and the frame cover;   a vent hole in the speaker frame to connect the front space to the resonance space; and   a duct hole formed between the resonance space and an outer surface of the speaker device;   wherein sound output in a first direction is emitted to the front space of the speaker frame, and sound output in a second and substantially opposite direction is emitted through the resonance space.   
     
     
         13 . The speaker device according to  claim 12 , wherein a signal cable extends from the speaker unit and passes through the duct hole. 
     
     
         14 . The speaker device according to  claim 12 , wherein the speaker unit includes
 a yoke disposed approximately at the center of the speaker frame;   a magnetic member attached to the front surface of the yoke and disposed in the front space of the speaker frame;   a voice coil disposed around the magnetic member; and   a vibration plate disposed in the front space of the speaker frame such that the vibration plate faces the magnetic member and the voice coil.   
     
     
         15 . The speaker device according to  claim 14 , wherein a protector is secured to the speaker frame to protect the speaker unit. 
     
     
         16 . The speaker device according to  claim 14 , wherein a metallic plate is disposed on the front surface of the magnetic member to induce a magnetic field to be distributed toward the voice coil. 
     
     
         17 . The speaker device according to  claim 12 , wherein the frame cover has a substantially flat-plate shape. 
     
     
         18 . The speaker device according to  claim 12 , wherein the speaker frame is injection molded and the resonance space has one open side formed by coupling the frame cover to the rear side of the speaker frame. 
     
     
         19 . The speaker device according to  claim 12 , wherein the speaker frame and the frame cover have grooves that face each other to form the duct hole when the frame cover is coupled to the speaker frame. 
     
     
         20 . The speaker device according to  claim 12 , wherein the duct hole is formed such that the duct hole opens toward an axis through a center of the speaker device. 
     
     
         21 . A speaker device for use in a mobile terminal, comprising:
 a front space;   a resonance space separated from the front space; and   a speaker unit to emit sound such that sound output in a first direction is emitted to the front space, and sound output in a second and substantially opposite direction is emitted through the resonance space.   
     
     
         22 . The speaker device according to  claim 21 , wherein the speaker unit is mounted in a speaker frame. 
     
     
         23 . The speaker device according to  claim 22 , wherein the front space is formed in the speaker frame. 
     
     
         24 . The speaker device according to  claim 23 , wherein a frame cover is connected to the speaker frame such that the resonance space is formed between the speaker frame and the frame cover; 
     
     
         25 . The speaker device according to  claim 24 , wherein a vent hole in the speaker frame connects the front space to the resonance space. 
     
     
         26 . The speaker device according to  claim 25 , wherein a duct hole is formed between the resonance space and an outer surface of the speaker device 
     
     
         27 . The speaker device according to  claim 26 , wherein a signal cable extends from the speaker unit and passes through the duct hole. 
     
     
         28 . The speaker device according to  claim 24 , wherein the speaker unit includes
 a yoke disposed approximately at the center of the speaker frame;   a magnetic member attached to the front surface of the yoke and disposed in the front space of the speaker frame;   a voice coil disposed around the magnetic member; and   a vibration plate disposed in the front space of the speaker frame such that the vibration plate faces the magnetic member and the voice coil.   
     
     
         29 . The speaker device according to  claim 24 , wherein a protector is secured to the speaker frame to protect the speaker unit. 
     
     
         30 . The speaker device according to  claim 28 , wherein a metallic plate is disposed on the front surface of the magnetic member to induce a magnetic field to be distributed toward the voice coil. 
     
     
         31 . The speaker device according to  claim 24 , wherein the frame cover has a substantially flat-plate shape. 
     
     
         32 . The speaker device according to  claim 24 , wherein the speaker frame is injection molded and the resonance space has one open side formed by coupling the frame cover to the rear side of the speaker frame. 
     
     
         33 . The speaker device according to  claim 24 , wherein the speaker frame and the frame cover have grooves that face each other to form a duct hole when the frame cover is coupled to the speaker frame. 
     
     
         34 . The speaker device according to  claim 26 , wherein the duct hole is formed such that the duct hole opens toward an axis through a center of the speaker device.