Patent Publication Number: US-10764685-B2

Title: Speaker

Description:
FIELD OF THE PRESENT DISCLOSURE 
     The present disclosure relates to the field of electro-magnetic transducers, more particularly to a speaker used in a portable electronic device. 
     DESCRIPTION OF RELATED ART 
     A speaker is a very important component equipped in a mobile phone for producing audible sounds. A speaker generally uses a diaphragm to produce vibration and further to generate sounds. 
     In order to adapt to miniaturization and multifunctional development of various audio equipment and information communication equipment, the speaker used in the equipment is more likely to be more miniaturized. The matching of other elements on the periphery of the loudspeaker is more compact. The vibration system and the magnetic circuit system of the speaker are directly connected with the sound quality of the speaker. The vibration system of a related speaker comprises a vibrating diaphragm and a voice coil assembly attached to the vibrating diaphragm. The magnetic circuit system comprises a yoke and a magnet arranged in the yoke. The coil fixedly supported by only the vibrating diaphragm, and when the vibrating system vibrates, unbalanced vibration is easily generated. The power is required to be reduced to meet the balance of the vibration system, and therefore the power of the vibration system is limited. So that the acoustic performance of the speaker using the vibration system is limited. Therefore, an improved speaker is desired. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the exemplary embodiments 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. 
         FIG. 1  is an isometric view of a speaker in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 2  is a cross-sectional view of the speaker in  FIG. 1 , taken along line A-A. 
         FIG. 3  is similar to  FIG. 2 , indicating another optional magnetic circuit system different from the magnetic circuit system in  FIG. 2 . 
         FIG. 4  is an isometric view of a suspension of the speaker in  FIG. 1 . 
         FIG. 5  is a broken view of the suspension in  FIG. 4 , taken along line C-C. 
         FIG. 6  is an enlarged view of Part B of  FIG. 5 . 
         FIG. 7  is an isometric and exploded view of the speaker in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby are only to explain the disclosure, not intended to limit the disclosure. 
     Referring to  FIGS. 1-2 , a speaker, in accordance with an exemplary embodiment of the present disclosure, includes a vibration system  1  and a magnetic circuit system  2 . The vibration system  1  includes a diaphragm  11  and a coil assembly  12  for driving the diaphragm  1 . The magnetic circuit system  2  includes an upper pole plate  21 , a lower pole plate  22  and a magnet  23  sandwiched between the upper pole plate  21  and the lower pole plate  22 . The diaphragm  11  connects to the coil assembly  12  and locates above the upper pole plate  21 . The magnet  23  includes a main magnet  231  and an auxiliary magnet  232  surrounding the main magnet  231  for forming a magnetic gap  233  therebetween. The coil assembly  12  at least partially received in the magnetic gap  233 . In the present disclosure, the coil assembly  12  may include a coil wound by conductive wires and coupled to a supporting member, and also may include only a coil. 
     Referring to  FIGS. 4-5 , the speaker further includes a suspension  24  accommodated in the magnetic gap  233 . The suspension  24  includes a first fastening portion  241 , a second fastening portion  242  and a connecting portion  243  connecting the first fastening portion  241  to the second fastening portion  242 . The first fastening portion  241  connects to an end of the coil assembly  12  far away from the diaphragm  1 , and the second fastening portion  242  is fixed to an inner side of the auxiliary magnet  232  adjacent to the main magnet  231 . 
     The connecting portion  243  has a wavy cross-section along a direction parallel to a vibration direction of the diaphragm. The suspension having a wavy structure provides better damping performance, and is beneficial to the stability of the vibration system, which improves the acoustic performance of the speaker. 
     The first fastening portion  241  connects to and forms a right angle with the coil assembly  12 , which ensures that the suspension  24  supports the coil assembly  12  better and further improves the stability of the vibration system. 
     The speaker provided by the present disclosure includes a suspension accommodated in the magnetic gap. The suspension has one end connected to the coil assembly and another end connected to the auxiliary magnet. The configuration of the suspension supports the coil assembly firmly, and s improves the stability of the vibration system thereby improving the acoustic performance of the speaker. 
     Referring especially to  FIG. 2 , the auxiliary magnet  232  further includes a capacity-expansion portion for increasing the space where the suspension locates. The capacity-expansion portion is formed by depressing the inner side of the auxiliary magnet adjacent to the main magnet  231 . 
     In this manner, the auxiliary magnet  232  actually has an inner diameter at a middle portion thereof greater than an inner diameter at a top portion or a lower portion thereof. Preferably, the suspension locates where the auxiliary magnet has the greatest inner diameter, which provides the suspension with enlarged space and more flexibility. Optionally, the auxiliary magnet further includes a slot in the inner side for fixing the second fastening portion of the suspension. 
     Referring to  FIG. 3 , another optional magnetic circuit system is provided. The auxiliary magnet  232  includes a first auxiliary magnet  2321  and a second auxiliary magnet  2322  engaging with the first auxiliary magnet  2321 . Along a direction from the lower pole plate  22  toward the diaphragm  11 , the second auxiliary magnet  2322  has a gradually increased inner diameter R 2 , and the first auxiliary magnet  2321  has a gradually decreased inner diameter R 1 . Each of the first auxiliary magnet and the second auxiliary magnet has an engaging surface defining the maximum inner diameter of the first auxiliary magnet and the second auxiliary magnet. The engaging surfaces of the first and second auxiliary magnets coincide with each other. The suspension is positioned between the engaging surfaces. 
     The configuration of the auxiliary magnet as shown in  FIG. 3  provides more design flexibility to arrange the suspension. 
     Optionally, the first auxiliary magnet  2321  is symmetrical with the second auxiliary magnet  2322  about a plane where the second fastening portion  242  locates. Along the direction from the lower pole plate  22  toward the diaphragm  11 , the second auxiliary magnet  2322  has a gradually increased inner diameter R 2 , and the first auxiliary magnet  2321  has a gradually decreased inner diameter R 1 . By virtue of the symmetrical configuration, the magnetic circuit system can provide maximized magnetic efficiency. In this embodiment, the gradually increased/decreased inner diameter is changed linearly. 
     Optionally, one of the engaging surfaces of the first and second auxiliary magnets is provided with a fastening slot  2323  for fastening the second fastening portion  242 . Alternatively, the fastening slot  2323  can be cooperatively formed by the two engaging surfaces of the first and second auxiliary magnets. 
     Referring to  FIGS. 3 and 7 , the upper pole plate  21  includes a first upper plate  211  covering the main magnet  231  and a second upper plate  212  covering the auxiliary magnet  232  and forming a gap from the first upper plate  211 . 
     The present disclosure provides an improved speaker including a suspension accommodated in a magnetic gap formed by a main magnet and an auxiliary magnet. The suspension is used for supporting a coil assembly of the speaker. The auxiliary magnet further includes a capacity-increased space for accommodating the suspension and providing the suspension with more space to vibrate and providing the suspension with better flexibility. In order to more firmly fix the suspension, the auxiliary magnet further includes a fastening slot for engaging with an edge of the suspension. Optionally, the auxiliary magnet is configured to be a two-piece structure. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary 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 where the appended claims are expressed.