Abstract:
An external sound box includes a connecting member and a sound box. The connecting member includes a sound passage and is selectively attachable to a surface of an electronic device to cover a sounding hole of the electronic device. The sound box is mounted to the connecting member. The sound box defines a resonant chamber communicating with the sound passage and a sounding output hole. Sound generated by the electronic device moves from the sounding hole into the sound passage and the sound box. The sounding passage and the sound box are configured so that the sound from the sounding hole resonates before exiting the sound output hole with increased volume.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Chinese Patent Application No. 201310747934.7 filed on Dec. 31, 2013, the contents of which are incorporated by reference herein. 
     FIELD 
     The subject matter herein generally relates to an external sound box, a loudspeaker module with the external sound box, and an electronic device having the loudspeaker module. 
     BACKGROUND 
     Electronic devices, such as mobile phones, personal digital assistants, include loudspeakers for implementing the multi-media playing function. The electronic devices commonly define receiving chambers for receiving the loudspeakers, and resonant cavities for sounds emitted by the loudspeakers to resonate. However, the volume of the loudspeaker may not be high enough or satisfy the requirements of the user. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is an assembled, isometric view of a first embodiment of an electronic device with a loudspeaker module. 
         FIG. 2  is a cross-sectional view taken along line II-II of  FIG. 1 . 
         FIG. 3  is an assembled, isometric view of a second embodiment of an electronic device with a loudspeaker module. 
         FIG. 4  is a cross-sectional view taken along line IV-IV of  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “substantially” is defined to be essentially conforming to the particular dimension, shape or other word that substantially modifies, such that the component need not be exact. For example, substantially cylindrical means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like. 
       FIG. 1  illustrates a first embodiment of an electronic device  200 . The electronic device  200  may be a mobile phone, a CD player, a MP3 player, a personal digital assistant (PDA) and the like. The electronic device  200  includes a housing  40  and a loudspeaker module  50 . The loudspeaker module  50  is mounted to the housing  40  and is configured to improve a volume of sounds of the electronic device  200 . 
       FIG. 2  illustrates that the housing  40  includes a bottom wall  41 , a top wall  43 , and a connecting wall  45 . The top wall  43  is parallel to and spaced apart from the bottom wall  41 . The connecting wall  45  is perpendicularly coupled between the outside peripheries of the bottom wall  41  and the top wall  43 . The top wall  43  includes a first surface  431  and a second surface  433  opposite to the first surface  431 . A receiving cavity  47  protrudes from the first surface  431  towards the bottom wall  41 . The top wall  43  further defines a sounding hole  435 . The sounding hole  435  communicates with the receiving cavity  47 . The sounding hole  435  is configured to transmit the sounds emitted by the loudspeaker module  50  to an exterior of the housing  40 . 
     The loudspeaker module  50  includes a loudspeaker  10  and an external sound  70 . The loudspeaker  10  is received in the receiving cavity  47  and is configured to emit sounds. The external sound box  70  includes a connecting member  20  and a sound box  30 . The sound box  30  is secured to the connecting member  20 . The connecting member  20  and the sound box  30  are both communicated with the loudspeaker  10 . Then, the sounds emitted by the loudspeaker  10  can be transmitted to the connecting member  20  and the sound box  30 . 
     In this embodiment, the connecting member  20  is substantially a ring and is mounted to the second surface  433 . A middle of the connecting member  20  defines a sound passage  21 . The sound passage  21  is aligned with and communicated with the sounding hole  435 . The connecting member  20  further includes a first end  23  and a second end  25  opposite to the first end  23 . The first end  23  defines a mounting slot  231 . The mounting slot  231  is configured to assemble the connecting member  20  to the second surface  433  of the housing  40 . The second end  25  defines a receiving slot  251  for mounting the sound box  30  to the connecting member  20 . In this embodiment, the connecting member  20  is made of soft material, such as rubber. Then, the connecting member  20  can be pressed on the second surface  433  of the housing  40  for preventing sounds emitted by the loudspeaker  10  from leaking. 
     The sound box  30  is substantially hollow and includes a base wall  31  and four sidewalls  33 . In this embodiment, the base wall  31  is substantially rectangular. The four sidewalls  33  are projected along the outer periphery of the base wall  31  and are partially received in the receiving slot  251  for assembling the sound box  30  to the connecting member  20 . The base wall  31  and the four sidewalls  33  further cooperatively form a resonant chamber  35 . The resonant chamber  35  is aligned with the sound passage  21  and the sounding hole  435 . Then, the sounds emitted by the loudspeaker  10  can transmit to the sounding hole  435  and the sound passage  21  and resonates in the resonant chamber  35  for improving the volume of the sounds transmitted to the exterior of the housing  40 . A sounding output hole  331  is defined at one of the four sidewalls  33 . When the sound box  30  is mounted to the connecting member  20 , the sounding output hole  331  is aligned with and communicated with the resonant chamber  35  for allowing the output of sounds emitted by the loudspeaker  10  of the electronic device  200 . 
     During assembly of the electronic device  200 , the loudspeaker  10  is received in the receiving cavity  47  and is aligned with the sounding hole  435 . The sound box  30  is mounted to the connecting member  20  via the four sidewalls  33  of the sound box  30  partially inserting into the receiving slot  251 . In this way, the resonant chamber  35  is aligned with the sound passage  21 . The sounding output hole  331  is communicated with the resonant chamber  35  and the sound passage  21 . The first end  23  of the connecting member  20  is pressed so that air is exhausted from the mounting slot  231 . Then, the connecting member  20  with the sound box  30  is mounted to the second surface  433  of the top wall  43  due to atmospheric pressure and for preventing sound from leaking. 
     In use, the sounds emitted by the loudspeaker  10  transmits to the resonant chamber  35  via the sounding hole  435  and the sound passage  21 , resonates in the resonant chamber  35 , and is output from the sounding output hole  331  to improve the volume of the sound transmitted to the exterior of the housing  40 . 
       FIG. 3  illustrates a second embodiment of an electronic device  300 . The electronic device  300  includes a housing  40  and a loudspeaker module  100  mounted to the housing  40 . 
       FIG. 4  illustrates the loudspeaker module  100  includes a loudspeaker  10 , a connecting member  20 , and a sound box  30 . The loudspeaker module  100  differs from the loudspeaker module  50  in that the loudspeaker module  100  further includes an extending member  83  coupled to the sound box  30 . 
     The extending member  83  includes an end wall  831  and a peripheral wall  833 . The peripheral wall  833  is perpendicularly coupled to the sidewall  33  defining the sounding output hole  331 . The end wall  831  is perpendicularly coupled to the peripheral wall  833  and is parallel to the sidewall  33  defining the sounding output hole  331 . The end wall  831 , the peripheral wall  833 , and the sidewall  33  defining the sounding output pole  331  cooperatively form a resonant cavity  835 . The resonant cavity  835  is communicated with the sounding output hole  331  and is configured to receive the sounds from the sounding output hole  331 . The end wall  831  further defines an extending hole  837 . The extending hole  837  is configured to output the resonated sounds from the resonant cavity  835 . 
     The embodiments shown and described above are only examples. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the details, especially in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.