CN211089943U

CN211089943U - Acoustic device and electronic equipment

Info

Publication number: CN211089943U
Application number: CN201922458160.1U
Authority: CN
Inventors: 周树芝; 张军; 徐同雁
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-07-24
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses an acoustic device and electronic equipment, the acoustic device comprises a sound production unit, the sound production unit comprises a main vibrating diaphragm, a sound outlet is arranged on the acoustic device, and sound waves on the front side of the main vibrating diaphragm radiate outwards through the sound outlet; a first closed cavity is formed on the rear side of the main vibrating diaphragm, a first mounting hole is formed in the cavity wall of the first closed cavity, a flexible vibrating 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 vibrating diaphragm is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated when the flexible vibrating diaphragm deforms in the second closed cavity; the first mounting hole is asymmetric special-shaped, the flexible diaphragm is asymmetric special-shaped matched with the first mounting hole, and the flexible diaphragm completely covers the first mounting hole.

Description

Acoustic device and electronic equipment

Technical Field

The utility model relates to an electroacoustic conversion equipment technical field, more specifically relates to an acoustics device and electronic equipment.

Background

Acoustic devices are important acoustic components in electronic equipment, which are a type of transducing device that converts an electrical signal into an acoustic signal. The acoustic device generally includes the shell, has received the sound production monomer in the shell to and connect sound production monomer and external connecting circuit, the sound production monomer is separated the back chamber of whole acoustic device module for two cavitys in preceding sound chamber and back sound chamber, is provided with the sound absorbing material who is used for the dilatation back chamber in the back chamber, and the flexible vibrating diaphragm of dilatation back chamber.

In the prior art, the flexible diaphragm of the back cavity has a conventional symmetrical shape, such as a square, a rectangle, a circle, etc. However, along with the continuous innovation and development of electronic technology and science and technology, the diversification of the product structure of the acoustic device becomes more and more obvious, and the cavity structures of many products present a certain asymmetry, and in this case, if the flexible diaphragm with the above symmetric structure is still used in combination, because the effective vibration area of the conventional symmetric diaphragm is too small, the phenomenon of rolling vibration or polarization is easy to occur, and the effective expansion rear cavity cannot be played. Therefore, the balance of the whole system is undoubtedly lost.

In view of the above, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of acoustics device and electronic equipment.

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

the sound production unit comprises a main vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the main vibrating diaphragm radiate outwards through the sound outlet;

the rear side of the main vibrating diaphragm forms a first closed cavity, a first mounting hole is formed in the cavity wall of the first closed cavity, a flexible vibrating 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 vibrating diaphragm is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated when the flexible vibrating diaphragm deforms in the second closed cavity;

the first mounting hole is in an asymmetric special-shaped shape, the flexible diaphragm is in an asymmetric special-shaped shape matched with the first mounting hole, and the flexible diaphragm completely covers the first mounting hole.

Optionally, the flexible diaphragm includes a central portion, a corrugated portion disposed around the central portion, and a fixing portion disposed around the corrugated portion; at least the fixed part is arranged in an asymmetric special shape relative to the central part.

Optionally, the flexible diaphragm includes a central portion, a corrugated portion disposed around the central portion, and a fixing portion disposed around the corrugated portion; the fixed part and the corrugated ring part are arranged in an asymmetric special shape relative to the central part.

Optionally, the flexible diaphragm includes a central portion, a corrugated portion disposed around the central portion, and a fixing portion disposed around the corrugated portion; the central part, the folded ring part and the fixing part are all in asymmetric special-shaped shapes.

Optionally, the acoustics device includes interconnect's first casing and second casing, sound generating unit installs in first casing and the second casing, sound generating unit's main vibrating diaphragm with form between first casing and the second casing first airtight chamber seted up on the first casing first mounting hole, flexible vibrating diaphragm covers completely first mounting hole.

Optionally, the fixed portion of the flexible diaphragm is fixedly connected to the wall of the cavity of the first sealed cavity, and the convex side of the edge portion of the flexible diaphragm faces the second housing.

The acoustic device includes interconnect's first casing and second casing, the sound generating unit is installed form sound generating component in first casing and the second casing for the electronic equipment of installation acoustic device has the shell, sound generating component install in the shell, the shell with form between first casing and the second casing the airtight chamber of second.

Optionally, the acoustic device further comprises a sound absorbing assembly mounted in the first enclosed cavity.

Optionally, the sound-absorbing assembly comprises a plate body, sound-absorbing particles, a sealing member and a sealing mesh cloth; a second mounting hole is formed in the second shell, the plate body is used for sealing the second mounting hole, the sealing mesh cloth is fixed on the second shell, and a filling cavity is formed among the plate body, the second shell and the sealing mesh cloth; the sound absorption device is characterized in that a filling opening is formed in the plate body, the sound absorption particles are arranged in the filling cavity through the filling opening, and the filling opening is sealed through a sealing element.

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

The utility model discloses a design flexible vibrating diaphragm for with the asymmetric special-shaped shape of first mounting hole assorted, flexible vibrating diaphragm covers first mounting hole completely, consequently can the level surface of make full use of acoustics device back chamber, the effective vibration area of increase flexible vibrating diaphragm avoids appearing rolling the phenomenon of shaking or polarization to promote the performance of product.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

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.

Fig. 1 is an exploded schematic view of an acoustic device according to the present invention;

fig. 2 is a schematic cross-sectional structural view of an acoustic device according to the present invention;

fig. 3 is a schematic structural diagram of a flexible diaphragm in an acoustic device according to the present invention;

fig. 4 is a schematic structural diagram of the electronic device of the present invention.

Detailed Description

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

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.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to fig. 1 and 2, an embodiment of the present invention provides an acoustic device, including: the sound production unit 11 comprises a main vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the main vibrating diaphragm radiate outwards through the sound outlet; generally speaking, the sound generating unit 11 includes a housing, a vibration system and a magnetic circuit system, the vibration system includes a main diaphragm fixed on the housing and a voice coil combined on the main diaphragm, the magnetic circuit system is formed with a magnetic gap, the voice coil is disposed in the magnetic gap, and the voice coil reciprocates up and down in a magnetic field after being supplied with alternating current, so as to drive the main diaphragm to generate sound by vibration. The rear side of the main vibrating diaphragm forms a first closed cavity, a first mounting hole 12 is formed in the cavity wall of the first closed cavity, a flexible vibrating diaphragm 13 is arranged on the first mounting hole 12, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible vibrating diaphragm 13 is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated when the flexible vibrating diaphragm 13 deforms in the second closed cavity; the first mounting hole 12 is an asymmetric irregular shape, the flexible diaphragm 13 is an asymmetric irregular shape matched with the first mounting hole 12, and the flexible diaphragm 13 completely covers the first mounting hole 12.

In the acoustic device provided by the embodiment of the present invention, when the main diaphragm vibrates downwards to compress the volume at the rear side of the main diaphragm, the sound pressure is transmitted to the flexible diaphragm 13 through the first airtight cavity, and the flexible diaphragm 13 expands and deforms towards the outside of the first airtight cavity; on the contrary, when the vibrating diaphragm vibrates upwards, the flexible vibrating diaphragm 13 can contract inwards to deform, so that the volume of the first closed cavity is adjusted, the equivalent acoustic compliance of the first closed cavity is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; and through the isolation design to sound generating unit 1 and flexible vibrating diaphragm 13, seal the radiation sound wave of flexible vibrating diaphragm 13 inside acoustic device, avoid the antiphase radiation sound wave of flexible vibrating diaphragm 13, cause the offset influence to the forward radiation sound wave of sound generating unit 1, and then the great range promotes the low frequency band sensitivity of product on the whole. And in the embodiment of the utility model provides an among the acoustic device, because flexible vibrating diaphragm 13 for with the asymmetric special-shaped shape of first mounting hole 12 assorted, flexible vibrating diaphragm 13 covers first mounting hole 12 completely, consequently can make full use of the planishing face of acoustic device back chamber, increase flexible vibrating diaphragm 13's effective vibration area avoids appearing rolling the phenomenon of shaking or polarization to promote the performance of product.

In one embodiment, the flexible diaphragm 13 includes a central portion 131, a flexure portion 132 disposed around the central portion 131, and a fixing portion 133 disposed around the flexure portion 132; at least the fixing portion 133 is provided in an asymmetric irregular shape with respect to the central portion 131.

The fixing portion 133 of the flexible diaphragm 13 is a portion for fixedly mounting the flexible diaphragm 13 at the first mounting hole 12, and therefore, according to the specific irregular shape of the first mounting hole 12, at least the fixing portion 133 of the flexible diaphragm 13 is set to be an asymmetric irregular shape matched with the first mounting hole 12, so as to ensure that the flexible diaphragm 13 can just completely cover the first mounting hole 12.

In one embodiment, the flexible diaphragm 13 includes a central portion 131, a flexure portion 132 disposed around the central portion 131, and a fixing portion 133 disposed around the flexure portion 132; the fixing portion 133 and the loop portion 132 are both disposed in an asymmetric irregular shape with respect to the central portion 131.

In the embodiment where the shape of the first mounting hole 12 is obvious, the fixing portion 133 of the flexible diaphragm 13 is only configured in a shape of a different shape, which does not match the first mounting hole 12 well, so in this embodiment, the corrugated portion 132 of the flexible diaphragm 13 is configured in an asymmetric shape along with the fixing portion 133, so as to ensure that the flexible diaphragm 13 can just cover the first mounting hole 12 completely.

In one embodiment, the flexible diaphragm 13 includes a central portion 131, a flexure portion 132 disposed around the central portion 131, and a fixing portion 133 disposed around the flexure portion 132; the central portion 131, the edge portion 132, and the fixing portion 133 are asymmetric and irregular shapes.

In the embodiment where the irregular shape of the first mounting hole 12 is very obvious, the fixed portion 133 and the corrugated portion 132 of the flexible diaphragm 13 are only configured in the irregular shape and cannot be well matched with the first mounting hole 12, so in this embodiment, the central portion 131 of the flexible diaphragm 13 is configured in the asymmetrical irregular shape together with the corrugated portion 132 and the fixed portion 133, so as to ensure that the flexible diaphragm 13 can just completely cover the first mounting hole 12.

The flexible diaphragm 13 may have a special shape, for example, a shape in which one vertex and one side of a rectangular shape are bent inward and recessed as shown in fig. 3. Of course, the special-shaped shape of the flexible diaphragm 13 is not limited to the shape shown in fig. 3, and the special-shaped shape of the flexible diaphragm 13 may have other various deformation structures according to the special-shaped shape of the first mounting hole 12, which is not limited by the present invention.

The flexible diaphragm 13 may be a single-layer structure, the single-layer structure is made of one of polymer plastic, thermoplastic elastomer and silicone rubber, or may be a multi-layer structure, and at least one layer of the multi-layer structure is made of one of polymer plastic, thermoplastic elastomer and silicone rubber.

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

The first casing 14 and the second casing 15 are mutually buckled and connected to form a cavity for accommodating the sound generating unit 11 and the flexible diaphragm 13, and the cavity is specifically the first sealed cavity.

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 bending portion 132 of the flexible diaphragm 13 is disposed toward the second housing 15. Specifically, the fixing portion 133 of the flexible diaphragm 13 is connected to the first housing 14 to cover the first mounting hole 12 formed in the first housing 14, and the protruding side of the loop portion 132 is disposed inward.

In one embodiment, the acoustic device includes a first casing 14 and a second casing 15 connected to each other, the sound generating unit 11 is mounted in the first casing 14 and the second casing 15 to form a sound generating assembly, the electronic device for mounting the acoustic device has a housing, the sound generating assembly is mounted in the housing, and the second sealed cavity is formed between the housing and the first casing 14 and the second casing 15. In this embodiment, the housing of the electronic device also serves as the cavity wall of the second sealed cavity, so that the internal space of the electronic device can be fully utilized, and meanwhile, the space occupied by a part of the cavity wall is saved, which is more favorable for the thin design of the electronic device.

In one embodiment, the acoustic device further comprises a sound absorbing assembly mounted in the first enclosed cavity. The arrangement of the sound absorption component can enlarge the effective volume of the rear cavity of the acoustic device.

In one embodiment, the sound absorption assembly includes a plate body 17, sound absorption particles, a sealing member 18 and a sealing mesh cloth 19, a second mounting hole 16 is formed in the second housing 15, the plate body 17 is used for closing the second mounting hole 16, the sealing mesh cloth is fixed on the second housing, and a filling cavity is formed among the plate body, the second housing and the sealing mesh cloth; the plate body 17 is provided with a filling opening 171, the sound absorption particles are arranged in the filling cavity through the filling opening 171, and the filling opening 171 is sealed through a sealing element 18.

The sound-absorbing particles are filled into the filling cavity between the plate body 17 and the sealing mesh cloth 19 through the filling opening 171, and then the filling opening 171 is plugged with the sealing member 18 for sealing. The sound-absorbing particles may be, for example, non-foamed sound-absorbing particles formed by bonding fine particles of zeolite raw powder.

In one embodiment, the acoustic device further includes a damping hole formed on the first casing 14 and a damping net 20 covering the damping hole, the damping net 20 may be disposed inside or outside the first casing 14, and the damping hole and the damping net 20 can function to adjust air pressure in the acoustic device.

Referring to fig. 4, the embodiment of the present invention further provides an electronic device, which includes a housing 2 and the acoustic device 1 as described above, wherein at least a portion of the housing 2 is used to form the second airtight cavity. The electronic device can be a mobile phone, a tablet computer, a notebook computer and the like. In this embodiment, the housing of the electronic device also serves as the cavity wall of the second sealed cavity, so that the internal space of the electronic device can be fully utilized, and meanwhile, the space occupied by a part of the cavity wall is saved, which is more favorable for the thin design of the electronic device.

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

Claims

1. An acoustic device, comprising:

the sound production unit (11) comprises a main vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the main vibrating diaphragm radiate outwards through the sound outlet;

the rear side of the main vibrating diaphragm forms a first closed cavity, a first mounting hole (12) is formed in the cavity wall of the first closed cavity, a flexible vibrating diaphragm (13) is arranged in the first mounting hole (12), a second closed cavity is arranged on the outer side of the first closed cavity, the flexible vibrating diaphragm (13) is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated when the flexible vibrating diaphragm (13) deforms in the second closed cavity;

the first mounting hole (12) is in an asymmetric special-shaped shape, the flexible diaphragm (13) is in an asymmetric special-shaped shape matched with the first mounting hole (12), and the flexible diaphragm (13) completely covers the first mounting hole (12).

2. The acoustic device according to claim 1, wherein the flexible diaphragm (13) comprises a central portion (131), a flexure portion (132) disposed around the central portion (131), and a fixing portion (133) disposed around the flexure portion (132); at least the fixing part (133) is provided in an asymmetric irregular shape with respect to the central part (131).

3. The acoustic device according to claim 1, wherein the flexible diaphragm (13) comprises a central portion (131), a flexure portion (132) disposed around the central portion (131), and a fixing portion (133) disposed around the flexure portion (132); the fixing portion (133) and the loop portion (132) are both disposed in an asymmetric irregular shape with respect to the central portion (131).

4. The acoustic device according to claim 1, wherein the flexible diaphragm (13) comprises a central portion (131), a flexure portion (132) disposed around the central portion (131), and a fixing portion (133) disposed around the flexure portion (132); the central part (131), the corrugated part (132) and the fixing part (133) are all asymmetric special-shaped shapes.

5. The acoustic device according to any one of claims 2 to 4, wherein the acoustic device comprises a first housing (14) and a second housing (15) connected to each other, the sound generating unit (11) is mounted in the first housing (14) and the second housing (15), the first sealed cavity is formed between a main diaphragm of the sound generating unit (11) and the first housing (14) and the second housing (15), the first mounting hole (12) is formed in the first housing (14), and the flexible diaphragm (13) completely covers the first mounting hole (12).

6. An acoustic device according to claim 5, wherein the fixed part (133) of the flexible diaphragm (13) is fixedly connected to the wall of the cavity of the first closed chamber, and the side of the flexible diaphragm (13) from which the corrugated part (132) protrudes is arranged towards the second housing (15).

7. The acoustic device according to claim 5, wherein the acoustic device comprises a first casing (14) and a second casing (15) connected to each other, the sound generating unit (11) is mounted in the first casing (14) and the second casing (15) to form a sound generating assembly, and the electronic equipment for mounting the acoustic device has an outer casing in which the sound generating assembly is mounted, and the outer casing and the first casing (14) and the second casing (15) form the second closed cavity therebetween.

8. The acoustic device of claim 5, further comprising a sound absorbing assembly mounted in the first enclosed cavity.

9. The acoustic device according to claim 8, wherein the sound-absorbing assembly comprises a plate body (17), sound-absorbing particles, a sealing element (18) and a sealing mesh (19);

a second mounting hole (16) is formed in the second shell (15), the plate body (17) is used for sealing the second mounting hole (16), the sealing mesh cloth is fixed on the second shell, and a filling cavity is formed among the plate body, the second shell and the sealing mesh cloth;

a filling opening (171) is formed in the plate body (17), the sound absorption particles are arranged in the filling cavity through the filling opening (171), and the filling opening (171) is sealed through a sealing element (18).

10. An electronic device, characterized in that it comprises an outer envelope (2) and an acoustic device (1) according to any one of claims 1-9, at least a portion of said outer envelope (2) being intended to form said second closed chamber.