Speaker module and electronic device

Abstract

The present disclosure relates to a speaker module and an electronic device. The module includes a module shell and a sound-generating device. A housing cavity and a plurality of resonance cavities are provided in the module shell. The sound-generating device is provided in the housing cavity. The sound-generating device divides the housing cavity into a front sound cavity and a rear sound cavity. The front sound cavity is connected to the external space through a sound outlet. The plurality of resonance cavities are connected in series, and one of the plurality of resonance cavities is connected to the front sound cavity. The plurality of resonance cavities are connected in series to provide a wide-band noise resonance frequency band, so that the noise in a wider frequency band can be absorbed. In this way, the plurality of resonance cavities connected in series can improve the sound effect of the speaker module.

Description

[0001] This application is a divisional application of the invention patent application with application date of July 28, 2017, application number 201710628083.2, and invention name “speaker module and electronic device”. Technical Field

[0002] The present invention relates to the technical field of electroacoustic conversion, and more specifically, to a speaker module and an electronic device. Background Art

[0003] In the existing speaker module, in order to reduce noise, a sealed resonance cavity is usually set on the module shell. The resonance cavity is connected to the front sound cavity. The resonance cavity has a significant improvement on the speaker module FR.

[0004] However, the existing resonant cavity is a single cavity. Limited by the singleness of the natural frequency, the frequency adjustment width of the resonant cavity is limited and it cannot effectively absorb noise in a wider frequency band. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a loudspeaker module.

[0006] According to a first aspect of the present invention, a speaker module is provided. The module comprises a module shell and a sound-generating device, wherein a housing cavity and a plurality of resonance cavities are arranged in the module shell, the sound-generating device is arranged in the housing cavity, and the sound-generating device divides the housing cavity into a front sound cavity and a rear sound cavity, wherein the front sound cavity is connected to an external space through a sound outlet; the plurality of resonance cavities are connected in series, and one of the plurality of resonance cavities is connected to the front sound cavity.

[0007] Optionally, the multiple resonance chambers include a first resonance chamber and a second resonance chamber, the first resonance chamber and the second resonance chamber are arranged adjacent to each other, a first connecting channel is arranged between the first resonance chamber and the second resonance chamber, and the second connecting channel is arranged between any one of the first resonance chamber and the second resonance chamber and the front sound chamber.

[0008] Optionally, the first resonance cavity and the second resonance cavity are arranged adjacent to the front acoustic cavity, and the first resonance cavity and the second resonance cavity are located on the side of the front acoustic cavity.

[0009] Optionally, the module shell includes an upper shell, a middle shell, a back cover and a lower cover, the middle shell includes side walls and a hollow area of ​​a accommodating cavity enclosed by the side walls, and a plurality of hollow areas of a resonance cavity; the upper shell covers the upper ends of the hollow area of ​​the accommodating cavity and the hollow areas of the plurality of resonance cavities, the back cover covers the lower end of the hollow area of ​​the accommodating cavity, and the lower cover covers the lower ends of the hollow areas of the plurality of resonance cavities, so as to enclose and form the accommodating cavity and the plurality of resonance cavities.

[0010] Optionally, at least one of the upper shell, the back cover and the lower cover is connected to the middle shell by ultrasonic welding.

[0011] Optionally, the middle shell is integrally injection molded.

[0012] Optionally, the resonant cavity is an independently arranged closed cavity, and a plurality of the closed cavities are connected in series through the first connecting channel. Optionally, the resonant cavity is a small cavity separated by a partition from a large cavity, and a plurality of the small cavities are connected in series through the first connecting channel.

[0013] Optionally, the front acoustic cavity is located on the side of the rear acoustic cavity.

[0014] According to another aspect of the present invention, an electronic device is provided, which includes the speaker module provided by the present invention.

[0015] The inventor of the present invention has found that in the prior art, the resonance cavity of the speaker module is a single cavity. Limited by the singleness of the natural frequency, the resonance cavity has a limited frequency adjustment width and cannot effectively absorb noise in a wider frequency band. Therefore, the technical task to be achieved or the technical problem to be solved by the present invention is something that those skilled in the art have never thought of or anticipated, so the present invention is a new technical solution.

[0016] In an embodiment of the present invention, a plurality of resonance cavities are provided in the module housing. The plurality of resonance cavities are connected in series, and one of the resonance cavities is connected to the front sound cavity. When the speaker unit emits sound, the incident sound pressure drives the air in the first connecting channel to move, and compresses the gas in the innermost resonance cavity. At the same time, the air pressure in other resonance cavities is also increased, thus forming a coupled resonance system. Multiple resonance cavities are connected in series to provide a wide-band noise resonance frequency band, which can absorb noise in a wider frequency band. In this way, multiple resonance cavities connected in series can improve the sound effect of the speaker module.

[0017] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 is an exploded view of a speaker module according to an embodiment of the present invention.

[0020] Figure 2It is a schematic structural diagram of a module housing without a lower cover and a rear cover according to an embodiment of the present invention.

[0021] Figure 3 The figure is a comparison diagram of the transmission loss of a speaker module according to an embodiment of the present invention and a speaker module with a single resonance cavity.

[0022] Description of reference numerals:

[0023] 11: first resonance cavity; 12: second resonance cavity; 13: middle shell; 14: upper shell; 15: back cover; 17: lower cover; 18: front sound cavity; 19: back sound cavity; 20: partition; 21: first connecting channel; 22: second connecting channel; 23: speaker unit; 24: magnetic conductive plate. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0027] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] Figure 1 is an exploded view of a speaker module according to an embodiment of the present invention. Figure 2 It is a schematic structural diagram of a module housing without a lower cover and a rear cover according to an embodiment of the present invention.

[0030] like Figure 1-2 As shown, the speaker module includes a module housing and a sound-generating device. A receiving cavity and a plurality of resonance cavities are arranged in the module housing. The sound-generating device is arranged in the receiving cavity. The sound-generating device divides the receiving cavity into a front sound cavity 18 and a rear sound cavity 19. The front sound cavity 18 is connected to the external space through a sound outlet.

[0031] The plurality of resonance chambers are connected in series. One of the plurality of resonance chambers is connected to the front acoustic chamber 18 via a second communication channel 22 .

[0032] The sound generating device may be a moving iron speaker unit or a moving coil speaker unit. These two units are common knowledge in the art and will not be described in detail here.

[0033] The resonance cavity is a closed cavity. Series connection means that multiple resonance cavities are connected one by one. A first connecting channel 21 is formed between the resonance cavities. One and only one resonance cavity is connected to the front sound cavity 18 through the second connecting channel 22.

[0034] The resonance cavity is an independently arranged sealed cavity. A plurality of sealed cavities are connected in series through the first connecting channel 21 .

[0035] Alternatively, the resonance cavity is a small cavity separated from a large cavity by a partition 20, and a plurality of small cavities are connected in series through the first connecting channel 21. This method simplifies the manufacture of the resonance cavity and makes the structure of the module housing compact.

[0036] The shape of the resonance cavity may be, but is not limited to, a cuboid, a sphere, a cone, etc. It may also be a cavity with an irregular structure designed by a person skilled in the art according to the shape of the reserved space for the device to be installed.

[0037] In an embodiment of the present invention, a plurality of resonance cavities are provided in the module housing. The plurality of resonance cavities are connected in series, and one of the resonance cavities is connected to the front sound cavity 18. When the speaker unit 23 makes a sound, the incident sound pressure drives the air in the first connecting channel 21 to move, and compresses the gas in the innermost resonance cavity. At the same time, the air pressure in other resonance cavities is also increased, thus forming a coupled resonance system. Multiple resonance cavities are connected in series to provide a wide-band noise resonance frequency band, which can absorb noise in a wider frequency band. In this way, multiple resonance cavities connected in series can improve the sound effect of the speaker module.

[0038] Those skilled in the art can adjust the noise resonance frequency band of the resonance cavity by setting the number, shape and volume of the resonance cavity to adjust the sound elimination frequency band.

[0039] In an example, Figure 1-2 As shown, the module housing includes an upper shell 14, a middle shell 13, a rear cover 15 and a lower cover 17. The middle shell 13 is a hollow structure. The middle shell 13 includes a side wall and a hollow area of ​​a receiving cavity surrounded by the side wall and a plurality of hollow areas of a resonance cavity.

[0040] The upper shell 14 covers the upper ends of the hollow areas of the accommodating cavity and the multiple resonance cavities, the rear cover 15 covers the lower end of the hollow areas of the accommodating cavity, and the lower cover 17 covers the lower ends of the hollow areas of the multiple resonance cavities to enclose the accommodating cavity and the multiple resonance cavities.

[0041] A second communication channel 22 for connecting a resonance cavity with the front acoustic cavity 18 is provided on the side wall.

[0042] It should be noted that the up and down directions are parallel to the vibration direction of the diaphragm of the speaker unit 23. The speaker unit divides the accommodating cavity into a front sound cavity 18 and a rear sound cavity 19. The second communication channel 22 is connected to the front sound cavity.

[0043] For example, the upper shell 14, the rear cover 15 and the lower cover 17 are all flat structures. The rear cover 15 is made of metal material to reduce the thickness of the module shell. In addition, the heat dissipation performance of the metal material is good. A magnetic conductive plate 24 is embedded on the rear cover 15. The speaker unit 23 is fixed on the magnetic conductive plate 24, wherein the magnetic circuit system of the speaker unit 23 is close to the magnetic conductive plate 24.

[0044] In this way, the module housing is easy to manufacture. For example, the upper shell 14, the middle shell 13, and the lower cover 17 are made of TPU material by injection molding. The rear cover 15 is made of a metal sheet by stamping.

[0045] In addition, the middle shell 13 is a hollow structure. During the integral injection molding, the mold does not need to use a slider, thereby reducing the difficulty of injection molding of the middle shell 13.

[0046] In addition, the installation of the speaker unit 23 becomes easy. For example, the speaker unit 23 is directly installed in the hollow area of ​​the accommodating cavity. The diaphragm of the speaker unit 23 is opposite to the upper shell 14. The space between the diaphragm and the upper shell 14 is at least a part of the front sound cavity 18. The magnetic circuit system of the speaker unit 23 is bonded and fixed on the magnetic conductive plate 24.

[0047] Optionally, at least one of the upper shell 14, the back cover 15 and the lower cover 17 is connected to the middle shell 13 by ultrasonic welding. Ultrasonic welding has the characteristics of fast welding speed and firm connection. For example, the upper shell 14, the middle shell 13 and the lower cover 17 are made of TPU material. The upper shell 14 is welded to the upper end of the middle shell 13 by ultrasonic welding, and the lower cover 17 is welded to the lower end of the middle shell 13.

[0048] Optionally, the rear acoustic cavity 19 is located at the side of the front acoustic cavity 18. This can reduce the height of the module housing. It should be understood by those skilled in the art that the side refers to the side along the extension surface of the front acoustic cavity.

[0049] Preferably, a plurality of resonance cavities are arranged in parallel. One of the two resonance cavities located at the end is communicated with the front sound cavity 18 .

[0050] The multiple resonance cavities are in an elongated structure as a whole, thus reducing the width and height of the multiple resonance cavities as a whole, making the speaker module more compact.

[0051] In addition, a resonance cavity located at the end is connected to the front sound cavity 18, which is different from the resonance cavity in the middle being connected to the front sound cavity 18. This method enables the coupling effect of the resonance system to be more fully exerted, further broadening the noise resonance frequency band.

[0052] In one example, the plurality of resonance chambers of the speaker module include a first resonance chamber 11 and a second resonance chamber 12. The first resonance chamber 11 and the second resonance chamber 12 are arranged adjacent to each other. The first resonance chamber 11 or the second resonance chamber 12 is connected to the front sound chamber 18. A first communication channel 21 is arranged between the first resonance chamber 11 and the second resonance chamber 12.

[0053] For example, Figure 2 As shown, the adjacent arrangement means that the first resonance cavity 11 and the second resonance cavity 12 are arranged side by side and adjacent to each other. The second resonance cavity 12 is connected to the front sound cavity 18 through the second connecting channel 22. When working, the incident sound pressure of the speaker unit 23 drives the air in the first connecting channel 21 to move and compresses the gas in the first resonance cavity 11. At the same time, the air pressure in the second resonance cavity 12 is also increased, thus forming a coupled resonance system.

[0054] Figure 3 The figure is a comparison diagram of the transmission loss of a speaker module according to an embodiment of the present invention and a speaker module with a single resonance cavity.

[0055] Transmission loss reflects the frequency range in which the speaker module can eliminate noise.

[0056] like Figure 3 As shown by the dotted line in , a single resonant cavity can only form one resonance peak. Figure 3 As shown by the solid lines in FIG. 1 , the two resonant cavities 11 and 12 form resonance peaks at two frequencies, thereby being able to absorb noise in a wider frequency band.

[0057] The number of resonance peaks corresponds to the number of resonance cavities, and the number of resonance cavities can be set according to the frequency bandwidth of the noise to absorb noise in a wider frequency band.

[0058] In an example, Figure 2 As shown, the first resonance cavity 11 and the second resonance cavity 12 are adjacent to the front sound cavity 18 and are located on the side of the front sound cavity 18. In this way, the module housing is more compact and the module housing is flat as a whole. In this way, the volume of the speaker module is reduced, which conforms to the development trend of electronic equipment to be thinner and smaller.

[0059] According to another embodiment of the present invention, an electronic device is provided. The electronic device may be, but is not limited to, a mobile phone, a tablet computer, a smart watch, a game console, a laptop computer, a walkie-talkie, a headset, etc. The electronic device includes the speaker module provided by the present invention.

[0060] The electronic equipment has the characteristics of low noise and good sound effect.

[0061] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A speaker module, comprising: Module housing; as well as Sound-generating device; Wherein, a receiving cavity and a plurality of resonance cavities are arranged in the module shell, the sound-generating device is arranged in the receiving cavity, the sound-generating device divides the receiving cavity into a front sound cavity and a rear sound cavity, and the front sound cavity is connected to the external space through a sound outlet; The plurality of resonance cavities disposed in the module housing are connected in series, and one of the plurality of resonance cavities is connected to the front acoustic cavity via a connecting channel disposed in the module housing; The plurality of resonance cavities disposed in the module housing include a first resonance cavity and a second resonance cavity, the first resonance cavity and the second resonance cavity are disposed adjacent to each other, wherein the first resonance cavity and the second resonance cavity are both disposed adjacent to the front acoustic cavity and are located on the same side of the front acoustic cavity; and Wherein, the first resonance cavity and the second resonance cavity are arranged side by side with the front acoustic cavity on one side of the rear acoustic cavity.

2. The speaker module according to claim 1, wherein: The second resonant cavity is connected to the first resonant cavity through a first communicating channel.

3. The speaker module according to claim 2, wherein: The first resonance cavity is connected to the front acoustic cavity through a second communication channel.

4. The speaker module according to claim 1, wherein: Each of the plurality of resonance cavities has a rectangular parallelepiped, spherical, or conical shape.

5. The loudspeaker module according to any one of claims 1 to 4, in, The sound-generating device is a speaker unit.

6. The speaker module according to claim 5, wherein: The speaker unit is a moving iron speaker unit or a moving coil speaker unit.

7. An electronic device comprising: A loudspeaker module according to any one of claims 1 to 6.

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