Acoustic device and electronic equipment

Abstract

The present invention discloses an acoustic device and an electronic device. The acoustic device comprises a sound-emitting unit, the sound-emitting unit comprises a main diaphragm, a sound outlet is arranged on the acoustic device, and the sound waves on the front side of the main diaphragm are radiated outward through the sound outlet; a first closed cavity is formed on the rear side of the main diaphragm, a first mounting hole is opened on the cavity wall of the first closed cavity, a flexible diaphragm is arranged on the first mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible diaphragm is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound waves generated by the flexible diaphragm when it is deformed in the second closed cavity; the first mounting hole is an asymmetric special-shaped shape, the flexible diaphragm is an asymmetric special-shaped shape matching the first mounting hole, and the flexible diaphragm completely covers the first mounting hole.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion devices, and more specifically, to an acoustic device and an electronic device. Background Art

[0002] The acoustic device is an important acoustic component in electronic equipment. It is a transducer device that converts electrical signals into acoustic signals. The acoustic device generally includes a shell, which contains a sound-generating unit and a connection circuit connecting the sound-generating unit to the outside world. The sound-generating unit divides the rear cavity of the entire acoustic device module into two cavities: the front cavity and the rear cavity. The rear cavity is provided with sound-absorbing materials for expanding the rear cavity and a flexible diaphragm for expanding the rear cavity.

[0003] At present, in the existing technology, the flexible diaphragm of the rear cavity adopts a conventional symmetrical shape, such as square, rectangular, circular, etc. However, with the continuous innovation and development of electronic technology and science and technology, the diversification of the product structure of acoustic devices is becoming more and more obvious, and the cavity structure of many products shows a certain degree of asymmetry. In this case, if the flexible diaphragm of the above symmetrical structure is still used, the effective vibration area of ​​the conventional symmetrical diaphragm is too small, which is prone to rolling vibration or polarization, and cannot effectively expand the rear cavity. Therefore, the balance of the entire system will undoubtedly be broken.

[0004] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for acoustic devices and electronic equipment.

[0006] According to a first aspect of the present invention, there is provided an acoustic device, comprising:

[0007] A sound-generating unit, wherein the sound-generating unit comprises a main diaphragm, and the acoustic device is provided with a sound outlet, through which the sound waves on the front side of the main diaphragm are radiated outward;

[0008] A first sealed cavity is formed at the rear side of the main diaphragm, a first mounting hole is opened on the cavity wall of the first sealed cavity, a flexible diaphragm is arranged on the first mounting hole, a second sealed cavity is arranged outside the first sealed cavity, the flexible diaphragm is located between the first sealed cavity and the second sealed cavity, and the second sealed cavity seals the sound waves generated by the flexible diaphragm when it is deformed in the second sealed cavity;

[0009] The first mounting hole is an asymmetric special-shaped shape, the flexible diaphragm is an asymmetric special-shaped shape matching the first mounting hole, and the flexible diaphragm completely covers the first mounting hole.

[0010] Optionally, the flexible diaphragm includes a central portion, a folded ring portion arranged around the central portion, and a fixed portion arranged around the folded ring portion; at least the fixed portion is arranged in an asymmetric shape relative to the central portion.

[0011] Optionally, the flexible diaphragm includes a central portion, a folded ring portion arranged around the central portion, and a fixed portion arranged around the folded ring portion; the fixed portion and the folded ring portion are both arranged in an asymmetric shape relative to the central portion.

[0012] Optionally, the flexible diaphragm includes a central portion, a folded ring portion arranged around the central portion, and a fixed portion arranged around the folded ring portion; the central portion, the folded ring portion and the fixed portion are all asymmetric special-shaped.

[0013] Optionally, the acoustic device includes a first shell and a second shell connected to each other, the sound unit is installed in the first shell and the second shell, the first closed cavity is formed between the main diaphragm of the sound unit and the first shell and the second shell, the first mounting hole is opened on the first shell, and the flexible diaphragm completely covers the first mounting hole.

[0014] Optionally, the fixing portion of the flexible diaphragm is fixedly connected to the cavity wall of the first sealed cavity, and a protruding side of the folding ring portion of the flexible diaphragm is arranged toward the second shell.

[0015] The acoustic device includes a first shell and a second shell connected to each other. The sound unit is installed in the first shell and the second shell to form a sound component. The electronic device used to install the acoustic device has a shell. The sound component is installed in the shell. The second closed cavity is formed between the shell and the first shell and the second shell.

[0016] Optionally, the acoustic device further comprises a sound absorbing component, and the sound absorbing component is installed in the first closed cavity.

[0017] Optionally, the sound absorbing assembly includes a plate body, sound absorbing particles, a seal and a sealing mesh; a second mounting hole is provided on the second shell body, the plate body is used to close the second mounting hole, the sealing mesh is fixed on the second shell body, and a filling cavity is formed between the plate body, the second shell body and the sealing mesh; a filling port is provided on the plate body, the sound absorbing particles are arranged in the filling cavity via the filling port, and the filling port is sealed by a seal.

[0018] According to another aspect of the present invention, there is provided an electronic device, comprising a housing and the acoustic device as described above, wherein at least a portion of the housing is used to form the second closed cavity.

[0019] The present invention designs the flexible diaphragm to be an asymmetric special-shaped shape that matches the first mounting hole. The flexible diaphragm completely covers the first mounting hole, thereby making full use of the flat surface of the rear cavity of the acoustic device, increasing the effective vibration area of ​​the flexible diaphragm, avoiding rolling vibration or polarization, and thus improving product performance.

[0020] 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

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the exploded structure of an acoustic device of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of an acoustic device of the present invention;

[0024] Figure 3 It is a schematic structural diagram of a flexible diaphragm in an acoustic device of the present invention;

[0025] Figure 4 The figure is a schematic structural diagram of an electronic device of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] refer to Figure 1 , Figure 2 As shown, an embodiment of the present invention provides an acoustic device, which includes: a sound-emitting unit 11, wherein the sound-emitting unit 11 includes a main diaphragm, and a sound outlet is arranged on the acoustic device, and the sound waves on the front side of the main diaphragm are radiated outward through the sound outlet; generally speaking, the sound-emitting unit 11 includes a shell and a vibration system and a magnetic circuit system accommodated and fixed in the shell, the vibration system includes a main diaphragm fixed on the shell and a voice coil combined on the main diaphragm, the magnetic circuit system forms a magnetic gap, and a voice coil is arranged in the magnetic gap, and after alternating current is passed through the voice coil, it makes up and down reciprocating motion in the magnetic field, thereby driving the main diaphragm to vibrate and make sound. A first closed cavity is formed on the rear side of the main diaphragm, a first mounting hole 12 is opened on the cavity wall of the first closed cavity, a flexible diaphragm 13 is arranged on the first mounting hole 12, a second closed cavity is arranged on the outside of the first closed cavity, the flexible diaphragm 13 is located between the first closed cavity and the second closed cavity, and the second closed cavity confines the sound waves generated by the flexible diaphragm 13 when it is deformed in the second closed cavity; the first mounting hole 12 is an asymmetric special shape, the flexible diaphragm 13 is an asymmetric special shape matching the first mounting hole 12, and the flexible diaphragm 13 completely covers the first mounting hole 12.

[0032] In the acoustic device provided in the embodiment of the present invention, when the main diaphragm vibrates downward to compress the volume on the rear side of the main diaphragm, the sound pressure will be transmitted to the flexible diaphragm 13 through the first closed cavity, and the flexible diaphragm 13 will expand and deform toward the outside of the first closed cavity; conversely, when the diaphragm vibrates upward, the flexible diaphragm 13 will shrink and deform inward, thereby adjusting the volume of the first closed cavity, thereby increasing the equivalent acoustic compliance of the first closed cavity, effectively reducing the resonant frequency of the acoustic device, and improving the low-frequency sensitivity; and through the isolation design of the sound unit 1 and the flexible diaphragm 13, the radiated sound waves of the flexible diaphragm 13 are enclosed in the interior of the acoustic device, avoiding the anti-phase radiated sound waves of the flexible diaphragm 13, which will cause a canceling effect on the forward radiated sound waves of the sound unit 1, thereby significantly improving the low-frequency sensitivity of the product as a whole. Furthermore, in the acoustic device provided in the embodiment of the present invention, since the flexible diaphragm 13 is an asymmetric special-shaped shape matching the first mounting hole 12, the flexible diaphragm 13 completely covers the first mounting hole 12, and therefore can fully utilize the flat surface of the rear cavity of the acoustic device, increase the effective vibration area of ​​the flexible diaphragm 13, avoid rolling vibration or polarization, and thus improve the performance of the product.

[0033] In one embodiment, the flexible diaphragm 13 includes a central portion 131 , a folded ring portion 132 disposed around the central portion 131 , and a fixed portion 133 disposed around the folded ring portion 132 ; at least the fixed portion 133 is disposed in an asymmetric shape relative to the central portion 131 .

[0034] The fixing portion 133 of the flexible diaphragm 13 is a portion for fixing the flexible diaphragm 13 at the first mounting hole 12. Therefore, according to the specific special-shaped shape of the first mounting hole 12, at least the fixing portion 133 of the flexible diaphragm 13 is set to an asymmetric special-shaped shape matching the first mounting hole 12, so as to ensure that the flexible diaphragm 13 can just completely cover the first mounting hole 12.

[0035] In one embodiment, the flexible diaphragm 13 includes a central portion 131 , a folded ring portion 132 disposed around the central portion 131 , and a fixed portion 133 disposed around the folded ring portion 132 ; the fixed portion 133 and the folded ring portion 132 are both disposed in an asymmetric shape relative to the central portion 131 .

[0036] In an embodiment where the irregular shape of the first mounting hole 12 is more obvious, only setting the fixing portion 133 of the flexible diaphragm 13 as an irregular shape cannot well match the first mounting hole 12. Therefore, in this embodiment, the folding ring portion 132 of the flexible diaphragm 13 is set to an asymmetric irregular shape together with the fixing portion 133 to ensure that the flexible diaphragm 13 can just completely cover the first mounting hole 12.

[0037] In one embodiment, the flexible diaphragm 13 includes a central portion 131 , a folded ring portion 132 disposed around the central portion 131 , and a fixed portion 133 disposed around the folded ring portion 132 ; the central portion 131 , the folded ring portion 132 and the fixed portion 133 are all asymmetric shapes.

[0038] In an embodiment where the irregular shape of the first mounting hole 12 is very obvious, only setting the fixing portion 133 and the folding ring portion 132 of the flexible diaphragm 13 as irregular shapes cannot well match the first mounting hole 12. Therefore, in this embodiment, the central portion 131 of the flexible diaphragm 13 together with the folding ring portion 132 and the fixing portion 133 are set to an asymmetric irregular shape to ensure that the flexible diaphragm 13 can just completely cover the first mounting hole 12.

[0039] The flexible diaphragm 13 may be shaped as follows: Figure 3 The rectangular shape shown in FIG. 1 is formed by bending and concave one vertex and one side inward. Of course, the special-shaped shape of the flexible diaphragm 13 is not limited to the shape shown in FIG. Figure 3 As shown in the shape, according to the special shape of the first mounting hole 12, the special shape of the flexible diaphragm 13 can also have other various deformation structures, and the present invention does not impose any special limitation on this.

[0040] The flexible diaphragm 13 may be a single-layer structure made of a material selected from polymer plastics, thermoplastic elastomers and silicone rubber, or a multi-layer structure, at least one layer of which is made of a material selected from polymer plastics, thermoplastic elastomers and silicone rubber.

[0041] In one embodiment, the acoustic device includes a first shell 14 and a second shell 15 connected to each other, the sound unit 11 is installed in the first shell 14 and the second shell 15, the first closed cavity is formed between the main diaphragm of the sound unit 11 and the first shell 14 and the second shell 15, the first mounting hole 12 is opened on the first shell 14, and the flexible diaphragm 13 completely covers the first mounting hole 12.

[0042] The first shell 14 and the second shell 15 are buckled and connected to each other to form a cavity for accommodating the sound unit 11 and the flexible diaphragm 13 , and the cavity is specifically the first closed cavity.

[0043] In one embodiment, the fixing portion 133 of the flexible diaphragm 13 is fixedly connected to the cavity wall of the first closed cavity, and the protruding side of the folding ring portion 132 of the flexible diaphragm 13 is arranged toward the second shell 15. Specifically, the fixing portion 133 of the flexible diaphragm 13 is connected to the first shell 14 to cover the first mounting hole 12 opened on the first shell 14, and the protruding side of the folding ring portion 132 is arranged inward.

[0044] In one embodiment, the acoustic device includes a first shell 14 and a second shell 15 connected to each other, the sound unit 11 is installed in the first shell 14 and the second shell 15 to form a sound assembly, and the electronic device for installing the acoustic device has a shell, the sound assembly is installed in the shell, and the second closed cavity is formed between the shell and the first shell 14 and the second shell 15. In this embodiment, the shell of the electronic device also serves as the cavity wall of the second closed cavity, which can make full use of the space inside the electronic device and save part of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device.

[0045] In one embodiment, the acoustic device further comprises a sound absorbing component, which is installed in the first closed cavity. The provision of the sound absorbing component can expand the effective volume of the rear cavity of the acoustic device.

[0046] In one embodiment, the sound absorbing assembly includes a plate body 17, sound absorbing particles, a seal 18 and a sealing mesh 19. The second shell body 15 is provided with a second mounting hole 16. The plate body 17 is used to close the second mounting hole 16. The sealing mesh is fixed on the second shell body. A filling cavity is formed between the plate body, the second shell body and the sealing mesh. The plate body 17 is provided with a filling port 171. The sound absorbing particles are arranged in the filling cavity via the filling port 171. The filling port 171 is sealed by a seal 18.

[0047] The sound absorbing particles are filled into the filling cavity between the plate body 17 and the sealing mesh 19 through the filling port 171, and then the filling port 171 is sealed by plugging the sealing member 18. The sound absorbing particles may be, for example, non-foamed sound absorbing particles formed by bonding zeolite raw powder particles.

[0048] In one embodiment, the acoustic device further includes a damping hole opened on the first shell 14 and a damping net 20 covering the damping hole. The damping net 20 can be arranged on the inner side or the outer side of the first shell 14. The damping hole and the damping net 20 can play a role in regulating the air pressure in the acoustic device.

[0049] refer to Figure 4 As shown, an embodiment of the present invention further provides an electronic device, which includes a housing 2 and the acoustic device 1 as described above, at least a portion of the housing 2 is used to form the second closed cavity. The electronic device may be a mobile phone, a tablet computer, a laptop computer, etc. In this embodiment, the housing of the electronic device also serves as the cavity wall of the second closed cavity, which can make full use of the space inside the electronic device, while saving a portion of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device.

[0050] 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. An acoustic device, characterized in that: include: A sound-generating unit (11), the sound-generating unit (11) comprising a main diaphragm, the acoustic device being provided with a sound outlet, the sound waves on the front side of the main diaphragm being radiated outwardly through the sound outlet; A first sealed cavity is formed on the rear side of the main diaphragm, a first mounting hole (12) is provided on the cavity wall of the first sealed cavity, a flexible diaphragm (13) is provided on the first mounting hole (12), a second sealed cavity is provided on the outside of the first sealed cavity, the flexible diaphragm (13) is located between the first sealed cavity and the second sealed cavity, and the second sealed cavity seals the sound waves generated by the flexible diaphragm (13) when it is deformed within the second sealed cavity; The first mounting hole (12) is an asymmetric special-shaped shape, the flexible diaphragm (13) is an asymmetric special-shaped shape matching the first mounting hole (12), and the flexible diaphragm (13) completely covers the first mounting hole (12); the flexible diaphragm (13) comprises a central portion (131), a folding ring portion (132) arranged around the central portion (131), and a fixing portion (133) arranged around the folding ring portion (132); the central portion (131), the folding ring portion (132) and the fixing portion (133) are all asymmetric special-shaped shapes.

2. The acoustic device according to claim 1, characterized in that The acoustic device comprises a first shell (14) and a second shell (15) connected to each other, the sound-emitting unit (11) is installed in the first shell (14) and the second shell (15), the first closed cavity is formed between the main diaphragm of the sound-emitting unit (11) and the first shell (14) and the second shell (15), the first mounting hole (12) is opened on the first shell (14), and the flexible diaphragm (13) completely covers the first mounting hole (12).

3. The acoustic device according to claim 2, characterized in that The fixing portion (133) of the flexible diaphragm (13) is fixedly connected to the cavity wall of the first sealed cavity, and the protruding side of the folding ring portion (132) of the flexible diaphragm (13) is arranged toward the second shell (15).

4. The acoustic device according to claim 2, characterized in that The acoustic device comprises a first shell (14) and a second shell (15) connected to each other, the sound-generating unit (11) is installed in the first shell (14) and the second shell (15) to form a sound-generating component, and an electronic device for installing the acoustic device has a housing, the sound-generating component is installed in the housing, and the second closed cavity is formed between the housing and the first shell (14) and the second shell (15).

5. The acoustic device according to claim 2, characterized in that The acoustic device further comprises a sound absorbing component installed in the first closed cavity.

6. The acoustic device according to claim 5, characterized in that The sound absorbing component comprises a plate body (17), sound absorbing particles, a sealing member (18) and a sealing mesh (19); The second shell (15) is provided with a second mounting hole (16); the plate (17) is used to close the second mounting hole (16); the sealing mesh is fixed to the second shell; and a filling cavity is formed between the plate, the second shell and the sealing mesh; The plate body (17) is provided with a filling port (171), the sound-absorbing particles are arranged in the filling cavity via the filling port (171), and the filling port (171) is sealed by a sealing member (18).

7. An electronic device, characterized in that: It comprises a housing (2) and the acoustic device (1) according to any one of claims 1 to 6, wherein at least a portion of the housing (2) is used to form the second closed cavity.

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