Abstract:
A loudspeaker module emitting sound at a lateral side comprises a loudspeaker unit and a module housing comprising a lower module housing, a middle module housing and an upper module housing. A space formed by the loudspeaker unit, the middle module housing and the lower module housing is a rear sound cavity. A space formed by the loudspeaker unit, the middle module housing and the upper module housing is a front sound cavity. The loudspeaker module further comprises a cover plate which forms a cavity together with the upper module housing. The cavity is communicated with the rear sound cavity through a conducting hole. By utilizing the loudspeaker module of the present invention, superfluous space of the upper module housing can be converted into the rear sound cavity, and therefore the size of the rear sound cavity is increased, and the acoustic performance of the loudspeaker module is improved.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to the technical field of loudspeaker, more specifically, to a loudspeaker module emitting sound at a lateral side. 
       BACKGROUND ART 
       [0002]    As the progress of society and the rapid development of science and technology, portable electronic products, such as, cellphones and ipads, etc., are rising gradually, and become popular due to convenience to carry and comprehensive functionalities, which satisfy people&#39;s various requirements, such as, surfing the Internet, communication, and entertainment, etc. As important acoustic components in portable electronic products, loudspeaker modules are widely used thereupon. As the improvement of requirements on portable electronic products, the acoustic performance of the loudspeaker module is being paid more and more attention. 
         [0003]      FIG. 1  shows a structural schematic diagram of the existing loudspeaker module emitting sound at a lateral side. As shown in  FIG. 1 , the existing loudspeaker module emitting sound at the lateral side comprises a loudspeaker unit  1  and a module housing for accommodating and fixing the loudspeaker unit. The module housing comprises a lower module housing  2 , a middle module housing  3  and an upper module housing  4 . A rear acoustic cavity  7  is defined as a space formed by the loudspeaker unit  1 , the middle module housing  3  and the lower module housing  2 . A front acoustic cavity  6  is defined as a space formed by the loudspeaker unit  1 , the middle module housing  3  and the upper module housing  4 . A sound hole is provided on the middle module housing  3  at a position close to the front acoustic cavity  6 , and the front acoustic cavity  6  is in communication with the sound hole. As the position of the loudspeaker unit  1  is limited by the position of the sound hole, a space is left above the loudspeaker unit. At present, the space is conventionally processed in such a manner, i.e., after the necessary front acoustic cavity is reserved, the remaining space is processed by locally cutting material to avoid shrinkage of the plastic housing, so that the remaining space cannot be utilized, which causes waste in the acoustic cavity space of the loudspeaker module emitting sound at the lateral side, thereby affecting the acoustic performance of the loudspeaker module emitting sound at the lateral side. 
         [0004]    Consequently, there is a need for a technical solution to provide a new loudspeaker module emitting sound at a lateral side, which loudspeaker module is capable of adequately utilizing the space of the acoustic cavity. 
       SUMMARY 
       [0005]    In view of the above problems, an objective of the present invention is to provide a loudspeaker module emitting sound at a lateral side, so as to resolve the problem that the existing loudspeaker module emitting sound at the lateral side is incapable of utilizing the surplus space in the upper module housing. 
         [0006]    A loudspeaker module emitting sound at a lateral side provided by the present invention comprises a loudspeaker unit and a module housing for accommodating the loudspeaker unit. The module housing comprises a lower module housing, a middle module housing and an upper module housing. A rear acoustic cavity is defined by the loudspeaker unit, the middle module housing and the lower module housing. A front acoustic cavity is defined by the loudspeaker unit, the middle module housing and the upper module housing, wherein, 
         [0007]    the loudspeaker module emitting sound at the lateral side further comprises a cover plate which is provided on a top of the upper module housing, and a cavity is defined by the cover plate and the upper module housing; a communicating hole is provided at a position where the upper module housing forming the cavity is connected to the rear acoustic cavity, so that the cavity is in communication with the rear acoustic cavity through the communicating hole; the front acoustic cavity is separated from the rear acoustic cavity by sealing the communicating hole. 
         [0008]    With the above loudspeaker module emitting sound at the lateral side provided by the present invention, by adding the cover plate at the top of the upper module housing, a cavity is formed by the upper module housing, and the cavity is in communication with the rear acoustic cavity, so as to increase the volume of the rear acoustic cavity, improve the acoustic performance of the loudspeaker module emitting sound at the lateral side, and avoid undesirable influence on the appearance of the loudspeaker module due to locally cutting material, and provide filter function to the sound generated by the loudspeaker module to a certain degree, thereby smoothing tone quality curves and making the sound more sweet-sounding. 
         [0009]    In order to achieve the above and related objectives, one or more aspects of the present invention comprise the features detailed below and indicated particularly in the claims. Some exemplary aspects of the present invention are described in details by the description below and the accompanying drawings. However, these aspects only indicate some implementations of various implementations of the present invention. In addition, the present invention is intended to contain these aspects and the equivalents thereof. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    By referring to the descriptions in connection with the accompanying drawings and the contents of the claims, and with a full understanding of the present invention, other purposes and results of the present invention will be more clearly and easily understand. In the drawings: 
           [0011]      FIG. 1  is a structural schematic diagram of the existing loudspeaker module emitting sound at the lateral side; 
           [0012]      FIG. 2  is a structural schematic diagram of the loudspeaker module emitting sound at the lateral side according to the embodiment 1 of the present invention; 
           [0013]      FIG. 3  is a section view taken along line A-A in  FIG. 2 ; 
           [0014]      FIG. 4  is a section view taken along line B-B in  FIG. 2 . 
           [0015]      FIG. 5  is a structural schematic diagram of the loudspeaker module emitting sound at the lateral side according to the embodiment 2 of the present invention; 
           [0016]      FIG. 6  is a section view taken along line A-A in  FIG. 5 ; and 
           [0017]      FIG. 7  is a section view taken along line B-B in  FIG. 5 . 
       
    
    
       [0018]    Same reference numerals in all of the accompanying drawings indicate similar or corresponding features or functions. 
         [0019]    Wherein, the reference numerals comprises: loudspeaker unit  1 , lower module housing  2 , middle module housing  3 , upper module housing  4 , sound hole  5 , front acoustic cavity  6 , rear acoustic cavity  7 , cover plate  8 , diaphragm  9 , communicating hole  10 , cavity  11 , slot  12 - 14 , fixing rib  15 . 
       DETAILED DESCRIPTION OF EMBODIMENTS 
       [0020]    Various specific details are set forth in the following description to comprehensively understand one or more embodiments for sake of illustration. However, it is obvious that these embodiments can be implemented without such specific details. In other examples, known structures and devices are illustrated by block diagrams to facilitate describing one or more embodiments. 
         [0021]    Hereinafter, particular embodiments of the present invention are described in connection with the accompanying drawings. 
         [0022]    As for the problem that the existing loudspeaker module emitting sound at the lateral side is incapable of utilizing the redundant space in the upper module housing, in the present invention, the redundant space in the upper module housing is transformed into a rear acoustic cavity, thereby increasing the volume of the rear acoustic cavity. Two particular embodiments are taken as examples to explain how to increase the volume of the rear acoustic cavity by utilizing the redundant space in the upper module housing. 
       Embodiment 1 
       [0023]      FIG. 2 ,  FIG. 3  and  FIG. 4  are a structural schematic diagram of the loudspeaker module emitting sound at the lateral side according to the embodiment 1 of the present invention, a section view taken along line A-A in  FIG. 2  and a section view taken along line B-B in  FIG. 2 , respectively. 
         [0024]    As shown in  FIG. 2 ,  FIG. 3  and  FIG. 4 , a loudspeaker module emitting sound at a lateral side is provided in the embodiment 1 of the present invention, the loudspeaker module emitting sound at the lateral side comprises a loudspeaker unit  1  and a module housing for accommodating the loudspeaker unit  1 . The loudspeaker unit comprises a diaphragm  9 . The module housing comprises a lower module housing  2 , a middle module housing  3  and an upper module housing  4  which are successively combined. 
         [0025]    After the front acoustic cavity is achieved by the upper module housing  4 , in order to utilize the redundant space in the upper module housing  4 , a cover plate  8  is provided on the top of the upper module housing  4  to be fitted to the slots  14  in four sidewalls of the upper module housing  4 , so as to form a cavity  11  with the upper module housing  4 . 
         [0026]    It should be noted that the cover plate  8  may be a sheet with certain strength. As a particular implementation of the embodiment 1 of the present invention, a metal sheet or alloy sheet with certain strength is used as the cover plate  8 , such as, a steel sheet, an iron sheet, a copper sheet or the like, so as to reduce the thickness of the cover plate  8  while guaranteeing strength. Likewise, PET or other resin materials may be used. 
         [0027]    In order to firmly fit the lower module housing  2  to the bottom of the middle module housing  3 , a concave slot  12  formed by removing materials is provided on the bottom of the sidewall of the middle module housing  3 , and the lower module housing  2  is fitted to the bottom of the middle module housing  3  through the slot  12 . A concave slot  13  formed by removing materials is provided on the top of the sidewall of the middle module housing  3 , and the upper module housing  4  is fitted to the top of the middle module housing  3  through the slot  13 . 
         [0028]    A stepped fixing rib  15  protruding from the inner wall of the middle module housing  3  is provided at the middle position of the middle module housing  3 , the loudspeaker unit  1  is fitted to the middle module housing  3  through the fixing rib  15 , and the fixing rib  15  is integrally formed with the middle module housing  3 . 
         [0029]    Wherein, a rear acoustic cavity  7  is formed by the space below the diaphragm  9  which space is formed by the loudspeaker unit  1 , the lower module housing  2 , and the middle module housing  3 ; a front acoustic cavity  6  is formed by the space above the diaphragm  9  which space is formed between the loudspeaker unit  1  and the bottom edge of the upper module housing  4 ; and the front acoustic cavity and the rear acoustic cavity are separated by the fixing rib  15 . The cavity  11  and the rear acoustic cavity  7  are separated by the bottom wall of the upper module housing  4 . In order to communicate the cavity  11  and the rear acoustic cavity  7 , a communicating hole  10  is provided on the bottom wall of the upper module housing  4  at a position where the rear acoustic cavity  7  is connected to the cavity  11 , so as to communicate the cavity  11  and the rear acoustic cavity  7 , and thus the cavity  11  is used as the rear acoustic cavity, thereby enlarging the volume of the rear acoustic cavity. 
         [0030]    It should be noted that, as most of components of the loudspeaker module are formed by plastic materials, it is very difficult to conduct secondary operation after assembly of the module housing, and the space limit on the loudspeaker module makes the secondary operation difficult after assembly of the module housing. Thus, the provided communicating hole  10  is not provided after assembly of the upper module housing  4  and the middle module housing  3 , but holes are provided at respective predetermined positions on the middle module housing  3  and the upper module housing  4  in advance, and then the holes on the middle module housing  3  and the upper module housing  4  are correspondingly bonded and sealed to form the communicating hole  10  while assembling the middle module housing  3  and the upper module housing  4 . 
         [0031]    As the rear acoustic cavity of the loudspeaker module is required to be sealed, the portion where the front acoustic cavity contacts with the rear acoustic cavity of the loudspeaker module is required to be sealed completely, wherein, the position where the above upper module housing  4  is fitted to the middle module housing  3 , the position where the middle module housing  3  is fitted to the lower module housing  2 , and the position where the loudspeaker unit  1  is fitted to the middle module housing  3  may be sealed by ultrasonic welding or gumming or compression joint or the like. Meanwhile, the position where the cover plate  8  is fitted to the upper module housing  4  is required to be sealed, and thus the position where the cover plate  8  is fitted to the upper module housing  4  may be likewise sealed by ultrasonic welding or gumming or compression joint or the like. Likewise, the cavity  11  and the front acoustic cavity are mutually isolated. 
         [0032]    A sound hole  5  is provided on the middle module housing  3  at a position adjacent to the front acoustic cavity  6 , and the front acoustic cavity  6  is in communication with the sound hole  5 , so as to export sound signals generated by the loudspeaker module. 
         [0033]    The structure of the loudspeaker module emitting sound at the lateral side in the embodiment 1 of the present invention is described above. As can be seen, in the embodiment 1 of the present invention, by providing a cover plate on the upper module housing, the cover plate forms a cavity with the upper module housing, and then the cavity is in communication with the rear acoustic cavity to transform the redundant space in the upper module housing into the rear acoustic cavity, thereby maximizing the volume of the rear acoustic cavity. Because the larger the volume of the rear acoustic cavity, the better the bass effect, the loudspeaker module emitting sound at the lateral side provided by the embodiment of the present invention can achieve good acoustic performance. 
       Embodiment 2 
       [0034]      FIG. 5 ,  FIG. 6  and  FIG. 7  are a structural schematic diagram of the loudspeaker module emitting sound at the lateral side according to the embodiment 2 of the present invention, a section view taken along line A-A in  FIG. 5 , and a section view taken along line B-B in  FIG. 5 , respectively. 
         [0035]    As shown in  FIG. 5 ,  FIG. 6  and  FIG. 7 , a loudspeaker module emitting sound at a lateral side is provided in the embodiment 2 of the present invention, similarly, the loudspeaker module emitting sound at the lateral side comprises a loudspeaker unit  1  and a module housing for accommodating the loudspeaker unit. The loudspeaker unit comprises a diaphragm  9  provided upward. The module housing comprises a lower module housing  2 , a middle module housing  3  and an upper module housing  4 . The upper module housing  4  has a cavity with an open top formed by four sidewalls and a bottom wall, and concave slots  14  formed by removing materials are provided on the four sidewalls of the upper module housing  4 , said slots  14  are used for firmly fitting the cover plate  8  to the top of the upper module housing  4  so as to form a cavity  11 . The cover plate  8  may be fitted to the top of the upper module housing  4  by a sealing method, such as, ultrasonic welding or gumming or compression joint or the like, so as to seal the top of the cavity  11 . 
         [0036]    In a particular implementation of the embodiment 2 of the present invention, the cover plate  8  may be a sheet with certain strength, and a sheet with certain strength, such as, a metal sheet or alloy sheet with certain strength is used as the cover plate  8 , such as, a steel sheet, an iron sheet, a copper sheet or the like, so as to reduce the thickness of the cover plate  8  while guaranteeing strength. In addition to this, the cover plate  8  may be formed by PET or other resin materials. 
         [0037]    Likewise, in order to firmly fit the lower module housing  2  to the bottom of the middle module housing  3 , a concave slot  12  formed by removing materials is provided on the bottom of the sidewall of the middle module housing  3 , and the lower module housing  2  is fitted to the bottom of the middle module housing  3  through the slot  12 . A concave slot  13  formed by removing materials is provided on the top of the sidewall of the middle module housing  3 , and the upper module housing  4  is fitted to the top of the middle module housing  3  through the slot  13 . The above upper module housing  4  may be fitted to the top of the middle module housing  3  by a sealing method, such as, ultrasonic welding or gumming or compression joint or the like, and the lower module housing  2  may also be fitted to the bottom of the middle module housing  3  by a sealing method, such as, ultrasonic welding or gumming or compression joint or the like. 
         [0038]    A stepped fixing rib  15  protruding from the inner wall of the middle module housing  3  is provided at the middle position of the middle module housing  3 , so as to fix the loudspeaker unit  1  on the middle module housing  3 . The fixing rib  15  is integrally formed with the middle module housing  3 . 
         [0039]    Wherein, a rear acoustic cavity  7  is formed by the space between the loudspeaker unit  1 , the lower module housing  2 , the middle module housing  3  and the fixing rib  15 ; a front acoustic cavity  6  is formed by the space between the loudspeaker unit  1 , the fixing rib  15  and the bottom edge of the upper module housing  4 ; and the front acoustic cavity  6  and the rear acoustic cavity  7  are separated by the fixing rib  15 . Meanwhile, the top of the fixing rib in the vertical direction is connected to the bottom edge of the upper module housing  4 , and the cavity  11  and the rear acoustic cavity  7  are separated by the bottom edge of the upper module housing  4 . In order to communicate the cavity  11  and the rear acoustic cavity  7 , a communicating hole  10  is provided on the bottom of the upper module housing  4  at a position where the rear acoustic cavity  7  is connected to the cavity  11 , so as to communicate the cavity  11  and the rear acoustic cavity  7  to form a large rear acoustic cavity. 
         [0040]    As the loudspeaker unit  1  and the lower module housing  2  are fitted to the middle module housing  3  in a sealing manner, and the top of the cavity  11  is sealed, the large rear acoustic cavity formed by communicating the cavity  11  and the rear acoustic cavity  7  is sealed. Thus, the sealed large rear acoustic cavity and the front acoustic cavity  6  are separated. 
         [0041]    A sound hole  5  is provided on the middle module housing  3  at a position close to the front acoustic cavity  6 , and the front acoustic cavity  6  is in communication with the sound hole  5 , so as to output sound signals generated by the loudspeaker module. 
         [0042]    The loudspeaker module emitting sound at the lateral side provided by the present invention is described in the above embodiments 1 and 2 in details. By adding a cover plate at the top of the upper module housing, the upper module housing forms a cavity, and then the cavity is in communication with the rear acoustic cavity to increase the volume of the rear acoustic cavity, improve the acoustic performance of the loudspeaker module emitting sound at the lateral side, and avoid undesirable influence on the appearance of the loudspeaker module due to locally cutting materials, and provide filter function to the sound generated by the loudspeaker module to a certain degree, thereby smoothing tone quality curves and making the sound more sweet-sounding. 
         [0043]    As described above, the loudspeaker module emitting sound at the lateral side provided by the present invention is described by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various improvements on details achieved therein can be made to the loudspeaker module emitting sound at the lateral side provided by the present invention as described above, without depart from the contents of the present invention. Accordingly, the scope of protection of the present invention is determined by the contents of the appended claims.