Patent Application
20170048600
The present disclosure relates to electro-acoustic converting technologies, and more particularly, to a sound generating device applicable to a mobile terminal and a method for making the sound generating device.
Sound generating devices are widely applied in mobile terminals, such as mobile phones, tablet computers, laptop computers, portable game players, portable multimedia devices, or the like, for converting electrical signals into audible sounds. A typical sound generating device includes a shell providing a hermetic cavity and a sound generator receiving in the hermetic cavity.
Due to a miniaturization trend of the mobile terminal, the sound generating device is required to have a small size, and thus an inner space of the hermetic cavity is limited. However, the limited space of the hermetic cavity may cause a resonance frequency of the sound generating device to be high; therefore, a low frequency performance of the sound generating device is impacted.
Therefore, it is desired to provide a new sound generating device which can overcome the aforesaid problems.
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.
The present disclosure will be described in detail below with reference to the attached drawings and the embodiment thereof.
Referring to
The shell 10 includes a main housing 12 and a cover 11, the cover 11 covers the main housing 12 for forming the receiving cavity 100. In the present embodiment, the sound generating device 1 further includes sound absorbing material 30 filled in the receiving cavity 100, and an isolating member 40 located between the sound generating body 20 and the sound absorbing material 30. The sound absorbing material 30 may be in form of sound absorbing powder, and the isolating member 40 may be an isolating mesh for isolating the sound absorbing material 30 from entering the sound generating body 20, for example, the isolating member 40 may be a dust-proof cloth.
The sound generating body 20 include at least one air hole 21 for providing an air excreting path for the sound generating body 20, the at least one air hole 21 is communicated with both the receiving cavity 100 of the shell 10 and an inner space of the sound generating body 20. In the present embodiment, the at least one air hole 21 is formed in a bottom of the sound generating body 20; alternatively, the at least one air hole 21 may also arranged in a sidewall of the sound generating body 20. The isolating member 40 may be arranged on a bottom surface of the sound generating body 20 to cover the at least one air hole 21.
The shell 10 may further include a filling opening 110 for filing the sound absorbing material 30 into the receiving cavity 100. In the present embodiment, the filling opening 110 is formed in the cover 11 as illustrated in
Furthermore, the sound generating device 1 may further include a sealing member 50 covering the filling opening 110. The sealing member 50 is provided for sealing the sound absorbing material 30 within the receiving cavity 100, and may be selected form a PET (polyethylene terephthalate) film or a dust-proof cloth.
In the present embodiment as illustrated in
In the sound generating device 1 as provided in the present disclosure, the sound absorbing material 30 can provide air pressure compensation which is equivalent to expanding an inner space of the receiving cavity, thus a resonance frequency in the receiving cavity 100 is reduced and a low frequency response of the sound generating device 1 is enhanced.
Accordingly, the low frequency performance of the sound generating device 1 is improved. Furthermore, the sound absorbing material 30 is directly filled in the receiving cavity 100, the inner space of the receiving cavity 100 can be fully utilized in despite of a cavity shape of the receiving cavity 100, therefore, the receiving cavity 100 can be fully filled with the sound absorbing material 30, and the low frequency performance of the sound generating device 1 can further be ensured.
Based on the sound generating device 1 as described above, the present disclosure further provides a method for making a sound generating device, which can be used to make the sound generating device 1 as illustrated
Step A, a cover 11, a main housing 12, a sound generating body 20 and an isolating member 40 is provided. One of the cover 11 and the main housing 12 include a filling opening 110, and the sound generating body 20 includes an air hole 21 communicated with an inner space of the sound generating body 20.
Step B, the cover 11, the main housing 12, the sound generating body 20 and the isolating member 40 is assembled;
Specifically, the cover 11 is assembled to the main housing 12 to form a shell 10 with a receiving cavity 100; the sound generating body 20 is received in the receiving cavity 100 and is assembled to the shell 10; the insolating member 40 is attached on the sound generating body 20 to cover the air hole 21.
Step C, sound absorbing material 30 is provided and filled into the receiving cavity 100 of the shell 10 via the filling opening 110, until the receiving cavity 100 is fully filled with the sound absorbing material 30.
Step D, a sealing member 50 is provided and attached to the shell 10 to cover the filling opening 110. In particular, the shell 10 may include a groove 111 formed in the cover 11 or the main housing 12 and surrounding the opening 110, and in step S4, the sealing member 50 is arranged in the groove 111 when being attached to the shell 10.
It should be noted that in step B of the method for making the sound generating device, the isolating member 40 can be firstly attached onto the sound generating body 20, and then the sound generating body 20 is assembled to the shell 10; alternatively, the sound generating body 20 is firstly assembled to the shell 10, and then the isolating member 40 is attached onto the sound generating body 20. Furthermore, the sound generating body 20 can be firstly assembled to the cover 11 and then the cover 11 is assembled to the main housing 12; the sound generating body 20 can be firstly assembled to the main housing 12, and then the cover 11 is assembled to the main housing 12.
It is to be understood, however, that even though numerous characteristics and advantages of the present embodiment have been set forth in the foregoing description, together with details of the structures and functions of the embodiment, 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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201510490567.6 | Aug 2015 | CN | national |
