Patent Publication Number: US-9900704-B2

Title: Speaker

Description:
FIELD OF THE DISCLOSURE 
     The present invention relates to the field of electro-acoustic transducers, and in particular, relates to a speaker. 
     BACKGROUND 
     With the rapid development of science and technology, the popularity rate of the audio devices has become higher and higher. The users not only require the audio devices to play videos and audios, but also put more and more demands on the reliability of the audio devices. Especially with the advent of 3G/4G times, the mobile multimedia technology is also flourished. Some audio devices have a variety of entertainment functions, such as video play, digital photographing, game, GPS navigation and the like. All of these functions require the electronic components in the audio device to be more and more precise and compact. 
     In the audio device, a speaker is a commonly used electronic component, which is mainly used to play audio signals. The related speaker generally has leak holes in its backside to communicate the magnetic gap and the spaces outside the speaker. However, when the speaker is fitted to a client, the leak holes in the backside of the speaker can be easily blocked by the client, so the acoustic performance of the speaker will be negatively affected, and so is the heat dissipation of the voice coil. 
     Therefore, it is desired to provide a new speaker which can overcome the aforesaid problems. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the embodiment can be better understood with reference to the following drawings. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded view showing the structure of the speaker in accordance with an exemplary embodiment of the present disclosure; 
         FIG. 2  is a cross-sectional view of the speaker shown in  FIG. 1 ; 
         FIG. 3  is a schematic view of a yoke of the speaker shown in  FIG. 1 ; and 
         FIG. 4  is a schematic view of a yoke in accordance with another exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will be described in detail below with reference to the attached drawings and the embodiments thereof. 
     Referring to  FIGS. 1-2 , a speaker  1  comprises a magnetic circuit system  10  for providing magnetic field, a vibration system  11  suspended above the magnetic circuit system  10  and generating sounds by vibrating, and an auxiliary system  12  for supporting the vibration system  10  and suspending the vibration system  11  above the magnetic circuit system  10 . 
     The vibration system  11  comprises a diaphragm  110  retained on the auxiliary system  12  and a voice coil  111  for driving the diaphragm  110  to vibrate. One end of the voice coil  111  is fixed with the diaphragm  110 , and the other end is suspended in the magnetic gap  102 . The diaphragm  110  comprises an edge portion  1100  with an outer perimeter secured on the auxiliary system  12  and providing elastic deformation, a middle portion  1101  disposed at the inner perimeter of the edge portion  1100 , and a rigid composite layer  1102  affixed under the middle portion  1101 . The end of the voice coil  111  is secured on the composite layer  1102  in a way that the area spanned by the voice coil  111  is no more than the area of the composite layer  1102 . The composite layer  1102  and the middle portion  1101  can be integrally provided or can be provided as separate structures. 
     The auxiliary system  12  comprises a basket  120  receiving the magnetic circuit system  10 , a front cover  121  covering and connected with the basket  120 , and conductive terminals  122  electrically connecting the speaker  1  and the outside power. The outer perimeter of the edge portion  1100  of the diaphragm  110  is retained on the basket  120 , so that the vibration system  11  can be retained on the basket  120 . The outer perimeter of the edge portion  1100  is interposed between the basket  120  and the front cover  121 . 
     The basket  120  comprises basket side walls  1200 . The basket side walls  1200  of the basket  120  are provided with through holes  1201  extending through the basket side walls  1200  and communicating the space under the diaphragm  110  and the space outside the speaker  1 . The through holes  1201  are used to balance the sound pressure in the space under the diaphragm  110 , especially the sound pressure in the space under the edge portion  1100 . Besides, the through holes  1201  are also used to dissipate the heat generated when the voice coil  111  is vibrating. 
     The front cover  121  comprises a plastic body portion  1210  and a rigid reinforcement  1211  injection molded with the body portion  1210  integrally. The front cover  121  is provided with a sound output hole  1212 . The sound output hole  1212  is provided in the rigid reinforcement  1211 . The rigid reinforcement  1211  can effectively increase the rigidity of the front cover  121  so that the thickness of the front cover  121  can be decreased under the prerequisite of guaranteeing the rigidity of the front cover  121 , and so that the entire speaker  1  can be made thinner. 
     Also referring to  FIG. 3 , the magnetic circuit system  10  comprises a yoke  100 , permanent magnets  101  assembled on the yoke  100 , a magnetic gap  102  near the permanent magnets  101 , and pole plates  103  attached on the surface of the permanent magnets  101 . The yoke  100  comprises an upper surface  1000  for assembling the permanent magnets  101 , a lower surface  1001  opposite to the upper surface  1000 , side surfaces  1002  connecting the upper surface  1000  and the lower surface  1001 , and communication conduits  1003  extending through the upper surface  1000  and the lower surface  1001 , and communicating the magnetic gap  102  and the space outside the speaker. The communication conduits  1003  not only can be used to leak air in order to balance the sound pressure inside the speaker  1 , but also can dissipate the heat generated by the voice coil  111  when vibrating. 
     The permanent magnets  101  comprise a main permanent magnet  1010  assembled in the middle of the yoke  100  and auxiliary permanent magnets  1011  disposed around the main permanent magnet  1010  and spaced apart from the main permanent magnet  1010 . The pole plates  103  comprise a main pole plate  1030  and an auxiliary pole plate  1031  attached on the main permanent magnet  1010  and the auxiliary magnetics  1011  respectively. The gap between the main permanent magnet  1010  and the auxiliary permanent magnets  1011  is magnetic gap  102 . In the present embodiment, the auxiliary pole plate  1031  is in the shape of ring plate, which can be injection molded integrally with the basket  120 , so that the bonding strength of the auxiliary pole plate  1031  and the basket  120  can be increased and the structure stability of the magnetic circuit system  10  can be improved. In the present disclosure, the shape of the auxiliary pole plate  1031  is not limited to the shape of ring plate in the present embodiment, it can also have any other suitable discontinuous ring shape. 
     Each of the communication conduits  1003  comprises a cut-out groove  1004  in the out perimeter of the yoke  100  and extending through the upper surface  1000  and lower surface  1001  of the yoke  100 , and a channel  1005  communicating the magnetic gap  102  and the cut-out groove  1004 . The channels  1005  are formed by depressing in the direction from the upper surface  1000  to the lower surface  1001 . The yoke  100  is in the shape of rectangular plate, which comprises two long axis edge portions  1006  and two short axis edge portions  1007  connecting the long axis edge portion  1006 . There are four cut-out grooves  1004  in the long axis edge portions  1006  and the cut-out grooves  1004  are symmetrical two by two with respect to a center line A in the long axis direction. There are two cut-out grooves  1004  in the short axis edge portions  1007  and the cut-out grooves  1004  are symmetrical with respect to a center line B in the short axis direction of the yoke  100 . Because the cut-out grooves  1004  extend through the upper surface  1000 , the lower surface  1001  and the side surfaces  1002 , the speaker  1  can realize simultaneous leakage from the bottom face and the side faces so that the diversity of the way of installing the speaker  1  to the client can be increased greatly. 
     The communication conduits  1003  are not limited to those in the above mentioned embodiment. Specifically, as shown in  FIG. 4 , in another embodiment, the communication conduits  1003  extend through the upper surface  1000  and the lower surface  1001  of the yoke  100 . 
     The yoke of the speaker are provided with communication conduits extending through the upper surface and the side surface of the yoke to communicate the magnetic gap and the space outside the speaker; the communication between the magnetic gap and the space outside the speaker  1  through the communication conduits not only can balance the sound pressure in the speaker  1  so as to improve the acoustic performance of the speaker  1 , but also dissipate the heat generated when the voice coil  111  is vibrating through the communication conduits  1003 . Besides, the technical problem of blocking the backside leakage when the speaker is fitted to the client can also be effectively solved. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.