Audio device and rear cavity structure thereof

Abstract

The present invention discloses an audio device and a rear cavity structure thereof, comprising a rear cavity shell, a speaker arranged on the inner wall of the rear cavity shell, and a conduit arranged in the rear cavity shell, wherein the first end of the conduit is arranged around the speaker and fits with the inner wall so as to wrap the speaker in the conduit, and the second end of the conduit extends into the cavity of the rear cavity shell; since a conduit is added in the rear cavity in the present application, and the first end of the conduit wraps the speaker in the conduit, and the second end of the conduit extends into the cavity of the rear cavity shell, during the vibration of the diaphragm of the speaker, the air in the conduit will vibrate with the vibration of the diaphragm, thereby increasing the additional vibration mass, increasing the overall mass of the rear cavity, thereby reducing the resonance frequency and improving the low-frequency performance.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of electronic devices, and particularly to an audio device and a rear cavity structure thereof. Background Art

[0002] With the continuous improvement of people's requirements for electronic products, portable and miniaturized electronic products are increasingly favored by people. At present, for some audio devices with high waterproof requirements (such as smart bracelets, etc.), due to their small size, the speaker can only adopt a closed-box design and cannot be opened to improve the low-frequency performance.

[0003] The existing closed-box design directly installs the speaker in a closed rear sound cavity (as shown in Figure 1 ), to facilitate waterproof sealing. Among them, the resonance frequency relationship formula is Mms is the equivalent mass of the speaker, and the resonance frequency of the speaker unit is F0. After adding the speaker to the rear cavity, due to the influence of the additional compliance of the cavity, the equivalent parallel compliance Cms = V / (1.4*10 5 ), V is the volume of the rear cavity. Since the rear cavity is closed and has a small volume, it is equivalent to greatly reducing the compliance of the speaker, reducing the compliance Cms of the entire vibration system, and the resonance frequency becomes F1, F0 < F1. Therefore, the low-frequency resonance frequency becomes higher and the low-frequency performance becomes worse.

[0004] In view of this, how to provide an audio device and a rear cavity structure that solve the above technical problems has become a problem that those skilled in the art need to solve currently. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide an audio device and a rear cavity structure thereof, which can reduce the resonance frequency and improve the low-frequency performance of the product during use.

[0006] To solve the above technical problems, the embodiments of the present invention provide a rear cavity structure of an audio device, including a rear cavity housing, a speaker disposed on the inner wall of the rear cavity housing, and a duct disposed in the rear cavity housing. The first end of the duct is disposed around the speaker and is attached to the inner wall, so as to wrap the speaker in the duct, and the second end of the duct extends into the cavity of the rear cavity housing.

[0007] Optionally, a first through hole is provided at a first preset distance from the speaker on the duct.

[0008] Optionally, the first preset distance is less than L / 2, where L represents the total length of the duct.

[0009] Optionally, a first sound resistance layer for covering the first through hole is provided at the first through hole.

[0010] Optionally, a second through hole is provided on the conduit at a second preset distance from the speaker.

[0011] Optionally, the second preset distance is greater than L / 2, where L represents the total length of the catheter.

[0012] Optionally, a second acoustic resistance layer for covering the second through hole is provided at the second through hole.

[0013] Optionally, the catheter is a curved catheter.

[0014] Optionally, the rear cavity shell is a closed shell.

[0015] An embodiment of the present invention provides an audio device, comprising the rear cavity structure of the audio device as described above.

[0016] An embodiment of the present invention provides an audio device and a rear cavity structure thereof, including a rear cavity shell, a speaker arranged on the inner wall of the rear cavity shell, and a conduit arranged in the rear cavity shell, wherein the first end of the conduit is arranged around the speaker and fits with the inner wall so as to wrap the speaker in the conduit, and the second end of the conduit extends into the cavity of the rear cavity shell. It can be seen that since a conduit is added to the rear cavity in the present application, and the first end of the conduit wraps the speaker in the conduit, and the second end of the conduit extends into the cavity of the rear cavity shell, during the vibration of the diaphragm of the speaker, the air in the conduit will vibrate with the vibration of the diaphragm, thereby increasing the additional vibration mass, increasing the overall mass of the rear cavity, thereby reducing the resonance frequency and improving the low-frequency performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of a back cavity structure of an existing audio device;

[0019] Figure 2 A schematic diagram of the structure of a rear cavity of an audio device provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a frequency response curve simulation provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of a rear cavity of another audio device provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a rear cavity of another audio device provided by an embodiment of the present invention;

[0023] Figure 6 Another frequency response curve simulation schematic diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The embodiment of the present invention provides an audio device and a rear cavity structure thereof, which can reduce the resonance frequency and improve the low-frequency performance of the product during use.

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please refer to Figure 2 , Figure 2 A schematic structural diagram of a rear cavity structure of an audio device provided in an embodiment of the present invention.

[0027] The rear cavity structure of the audio device includes a rear cavity shell 1, a speaker 2 arranged on the inner wall of the rear cavity shell 1, and a conduit 3 arranged in the rear cavity shell 1. The first end of the conduit 3 is arranged around the speaker 2 and fits with the inner wall so as to wrap the speaker 2 in the conduit 3. The second end of the conduit 3 extends into the cavity of the rear cavity shell 1.

[0028] It should be noted that the speaker 2 is disposed on an inner wall of one side of the rear cavity housing 1. In this embodiment, a conduit 3 is added inside the rear cavity housing 1, and the first end of the conduit 3 is as shown in FIG. Figure 2 As shown, the speaker 2 is surrounded and fits with the inner wall where the speaker 2 is set, so that the sound emitted by the speaker 2 is transmitted into the cavity of the rear cavity shell 1 through the conduit.

[0029] In the present application, during the operation of the speaker 2, the air in the conduit 3 will vibrate with the vibration of the diaphragm in the speaker 2, thereby increasing the additional vibration mass, the additional vibration mass Mms'=4ρL / (3*S), where, ρ is the air density, L is the length of the conduit, S is the equivalent cross-sectional area of ​​the conduit, and the resonant frequency relationship is It can be seen that the equivalent mass of the system after adding the conduit 3 is the equivalent series mass of the speaker and the conduit, so the equivalent mass of the system increases, thereby reducing the resonance frequency. Among them, the longer the length of the conduit 3 and the smaller the equivalent area, the more conducive it is to lower the low-frequency resonance frequency and improve the low-frequency performance.

[0030] Please refer to Figure 3 The frequency response simulation curve is shown, wherein the dotted line is the frequency response curve corresponding to the closed box + catheter rear cavity structure provided in this embodiment, and the solid line is the frequency response curve corresponding to the traditional closed box rear cavity structure. It can be seen that the rear cavity structure in this embodiment can improve the low-frequency performance compared with the traditional rear cavity structure.

[0031] In addition, in order to improve the waterproof performance of the product, the rear cavity shell 1 of the audio device can be designed as a closed shell, that is, the rear cavity shell 1 can adopt a closed box design.

[0032] In order to prevent the sound generated by the vibration of the diaphragm of the speaker 2 from leaking through the gap between the first end of the conduit 3 and the inner wall of the later shell 1, resulting in a reduction in the additional vibration mass, the first end of the conduit 3 in this embodiment can be bonded to the inner wall by a sealant.

[0033] It should also be noted that the conduit 3 in this embodiment can be a curved conduit, such as a broken line or a curve, and its specific arrangement can be set according to the actual space in the rear cavity, and this embodiment does not make any special restrictions. In addition, the tube body of the conduit 3 in this embodiment is uniform in thickness. In this embodiment, except for the structure of the first end portion and the second end portion of the conduit 3, the other parts are the tube body portion. Specifically, in the conduit 3 in this embodiment, except for the part of the first end used to surround the speaker, which is appropriately thicker, the structure of the tube body and the second end portion can both adopt a conduit structure with uniform thickness.

[0034] Furthermore, a first through hole 31 is provided on the conduit 3 at a first preset distance from the speaker 2 , wherein the first preset distance is less than L / 2, wherein L represents the total length of the conduit 3 .

[0035] Specifically, since the control in the conduit 3 is prone to vibration, which has a certain impact on the frequency response, the frequency response curve has peaks and valleys and is not smooth enough. Therefore, in this embodiment, the first through hole 31 can be set on the conduit 3 to eliminate the adverse effect of resonance on the frequency response curve. In this embodiment, the first through hole 31 can be specifically set at a first preset distance from the speaker 2, wherein the first preset distance is less than L / 2, that is, the setting position of the first through hole 31 is close to the speaker 2, which is conducive to eliminating the resonance of lower frequencies. For specific structural diagrams, please refer to Figure 4 , wherein the conduit 3 is arranged in a curved conduit, and the first through hole 31 can be arranged at a position corresponding to the speaker 2, such as Figure 2 and Figure 4 The conduit 3 is specifically shown as being arranged along the inner wall of the rear cavity shell. Of course, the specific shape of the conduit 3 is not specifically limited in this embodiment and can be set according to the actual space in the rear cavity.

[0036] Of course, the conduit 3 in this embodiment can also be provided with a second through hole 32, which can be specifically provided at a second preset distance from the speaker 2, and the second preset distance is greater than L / 2, that is, the second through hole 32 is provided away from the speaker 2, which is conducive to eliminating the resonance of higher frequencies, wherein the specific setting positions of the first through hole 31 and the second through hole 32 can be determined according to actual conditions, and this application does not make specific restrictions on this. For specific structures, please refer to Figure 5 , wherein, when the catheter 3 is a curved catheter, the second through hole 32 can be set at the position shown in the figure.

[0037] In addition, since the provision of the through holes will cause part of the gas to leak from the through holes, in order to prevent the provision of the first through hole 31 and / or the second through hole 32 from reducing the air vibration mass in the conduit 3, in this embodiment, a first acoustic resistance layer for covering the first through hole 31 may be provided at the first through hole 31; and / or a second acoustic resistance layer for covering the second through hole 32 may be provided at the second through hole 32, wherein both the first acoustic resistance layer and the second acoustic resistance layer may be made of mesh cloth, and in order to facilitate the production of the first acoustic resistance layer and / or the second acoustic resistance layer, both may be provided on the outside of the conduit 3.

[0038] Please refer to Figure 6 In the frequency response simulation diagram shown in the figure, the dotted line is the frequency response curve of the rear cavity structure corresponding to the first through hole 31 set on the conduit 3 in this embodiment, which is implemented as a frequency response curve corresponding to the traditional rear cavity structure. It can be seen that the rear cavity structure provided in this embodiment can improve the low-frequency performance and eliminate the resonance of lower frequencies to a certain extent, thereby ensuring the sound effect, compared with the traditional closed box structure.

[0039] On the basis of the above embodiment, an embodiment of the present invention provides an audio device, including the back cavity structure of the audio device as described above.

[0040] It should be noted that the audio device in this embodiment has the same beneficial effects as the rear cavity structure provided in the above embodiments, and for the specific introduction of the rear cavity structure involved in this embodiment, please refer to the above embodiments, and this application will not repeat them here.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear cavity structure of an audio device, characterized in that: It includes a rear cavity shell, a speaker arranged on the inner wall of the rear cavity shell, and a conduit arranged in the rear cavity shell, wherein the first end of the conduit is arranged around the speaker and fits with the inner wall so as to wrap the speaker in the conduit, and the second end of the conduit extends into the cavity of the rear cavity shell; wherein the conduit is a curved conduit, the first end of the conduit is fit with the inner wall of the rear cavity shell through a sealant, and the rear cavity shell is a closed shell.

2. The rear cavity structure of the audio device according to claim 1, characterized in that: A first through hole is provided on the conduit at a first preset distance from the speaker.

3. The rear cavity structure of the audio device according to claim 2, characterized in that: The first preset distance is less than L / 2, where L represents the total length of the catheter.

4. The rear cavity structure of the audio device according to claim 2, characterized in that: A first acoustic resistance layer for covering the first through hole is provided at the first through hole.

5. The rear cavity structure of the audio device according to claim 2, characterized in that: A second through hole is provided on the conduit at a second preset distance from the speaker.

6. The rear cavity structure of the audio device according to claim 5, characterized in that: The second preset distance is greater than L / 2, where L represents the total length of the catheter.

7. The rear cavity structure of the audio device according to claim 5, characterized in that: A second acoustic resistance layer for covering the second through hole is provided at the second through hole.

8. An audio device, characterized in that: A rear cavity structure comprising the audio device as described in any one of claims 1 to 7.

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