WO2020034555A1

WO2020034555A1 - Sound-emitting device and electronic device

Info

Publication number: WO2020034555A1
Application number: PCT/CN2018/125594
Authority: WO
Inventors: 葛连山; 朱婷; 张成飞
Original assignee: 歌尔股份有限公司
Priority date: 2018-08-16
Filing date: 2018-12-29
Publication date: 2020-02-20
Also published as: CN109218939B; CN109218939A

Abstract

Disclosed in the present invention are a sound-emitting device and an electronic device, the sound-emitting device comprising a first housing and a fixed magnetic circuit assembly and vibrating assembly which are connected to the first housing; the vibrating assembly comprises a vibrating diaphragm; a second housing is mounted on a side surface of the vibrating diaphragm which is away from the first housing, a first cavity is formed in a space between the second housing and the vibrating diaphragm, and a sound-absorbing material is filled into the first cavity; a space between the vibrating diaphragm, the first housing and the magnetic circuit assembly forms a second cavity; air holes which communicate with the outside are disposed in the second cavity and transmit sound waves radiated by the vibrating diaphragm to the external environment. The monomer according to the present invention has the characteristics of good heat dissipation and first-rate acoustic functions.

Description

Sound generator and electronic equipment

Technical field

The present invention relates to the technical field of electroacoustic products, and more particularly, the present invention relates to a sound generating device and an electronic device.

Background technique

The sound generating device is a basic unit for realizing electroacoustic conversion. The sound generating device includes a single housing, a vibration component and a magnetic circuit component. The vibration component and the magnetic circuit component are housed in the single housing. The vibration component includes a diaphragm and a sound connected to the diaphragm Coil, the diaphragm separates the inner cavity of the single shell into a second cavity and a first cavity, the voice coil and the magnetic circuit component are located in the first cavity, and the voice coil is placed in a magnetic gap formed by the magnetic circuit component. In this way, when the voice coil receives the AC signal, it can drive the diaphragm to vibrate under the action of the magnetic field generated by the magnetic circuit component, and then motivate the surrounding air to make a sound.

Because the voice coil of the sound generating device is wound by a wire, the voice coil generates heat when it receives the AC signal. The longer the working time, the more obvious the heat is. If the voice coil cannot heat effectively for a long time, Affects the life of the sound generator and the maximum volume it can provide.

In the prior art, both the voice coil and the magnetic circuit component are installed in the first cavity of the sound generating device, and the first cavity is a closed structure, which makes the heat dissipation of the voice coil always a difficult problem in the industry, and, With the increasing integration of electronic devices equipped with sound generating devices, the size of sound generating devices is becoming smaller and smaller, and the influence of voice coil heating on the performance of sound generating devices is particularly prominent. Therefore, it is necessary to provide a new sound generating device. The structure of the device is beneficial to the heat dissipation of the voice coil.

Summary of the Invention

An object of the embodiment of the present invention is to provide a new technical solution of a sound generating device, so as to realize heat dissipation of the voice coil without substantially affecting the original acoustic performance.

According to a first aspect of the present invention, there is provided a sound generating device including a first casing, a magnetic circuit component and a vibration component connected and fixed to the first casing; the vibration component includes a diaphragm, and A second housing is mounted on a surface of the diaphragm far from the first housing; a space between the second housing and the diaphragm forms a first cavity, and the first cavity is filled in A sound-absorbing material; a space between the diaphragm, the first housing, and the magnetic circuit component forms a second cavity; the second cavity is provided with an air hole communicating with the outside, and vibrates the diaphragm The radiated sound waves are transmitted to the external environment.

Optionally, the second housing includes a second housing body, and the second housing body is configured as a straight-cylinder structure with both ends open, and the first end opening is along the vibration direction of the diaphragm with The diaphragms are assembled together, and a sealing cover is sealed at the opening of the second end.

Optionally, the sealing cover and the second housing body are of a separate structure, and are fixed by being glued together; or, the sealing cover is integrally formed with the second housing body.

Optionally, a partition plate is provided in the second casing body; the partition plate extends from one end of the second casing body to another opposite side end to separate the first cavity. The vibrating cavity is opposite to the vibrating membrane and the sound absorbing cavity is arranged adjacent to the vibrating cavity.

Optionally, the sound-absorbing material is disposed in the sound-absorbing cavity, and the partition plate has a communication hole communicating the vibration cavity and the sound-absorbing cavity.

Optionally, the separator includes a separator body, a through hole provided on the separator body, and a mesh cloth covering the through hole, and the communication hole includes a mesh hole of the mesh cloth.

Optionally, the separator is made of a porous material, and the communication hole includes a pore having the separator itself.

Optionally, the sound-absorbing material is a sound-absorbing particle, and a filling hole is opened in the sealing cover, and the sound-absorbing particle is filled from the filling hole to fill the sound-absorbing cavity; The mesh cloth is isolated from the vibration cavity, and is isolated from the external environment by a damping member covered at the filling hole.

Optionally, the sound absorbing material is a sound absorbing cotton, and the sound absorbing cotton is filled in from the second end opening of the second casing body.

Optionally, the air hole includes an opening provided by the magnetic circuit component; the opening includes a first portion penetrating the magnetic circuit component in a middle portion of the central magnet of the magnetic circuit component and along the vibration direction of the vibration component. Opening.

Optionally, the opening further includes a second opening provided corresponding to the magnetic gap and communicating with the first opening.

Optionally, the first casing, the diaphragm, and the second casing are sequentially assembled in a vibration direction of the diaphragm, and the first casing and the second casing are laterally arranged. The dimension does not exceed the lateral dimension of the diaphragm.

Optionally, the volume of the first cavity is less than 0.6 cubic centimeters.

According to a second aspect of the present invention, there is provided an electronic device including the sound generating device according to the first aspect of the present invention.

A beneficial effect of the present invention is that the voice coil of the embodiment of the present invention sets the voice coil in the second cavity. Since the second cavity has air holes communicating with the outside world, the hot air around the voice coil can directly communicate with the voice coil. Convection of outside air can quickly reduce the temperature of the voice coil. In addition, the sound emitting device of the embodiment of the present invention is provided with a sound absorbing material for expansion in the first cavity. In this way, the actual volume of the first cavity can be compressed to control the external size of the sound emitting device to be equivalent to the prior art. Ensure that the acoustic performance of the sound generator is not affected.

BRIEF DESCRIPTION OF THE 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.

1 is a schematic diagram of an appearance of a sound generating device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an appearance of the sound generating device shown in FIG. 1 from another perspective; FIG.

3 is a schematic exploded structure diagram of the sound generating device shown in FIG. 1;

4 is a schematic bottom view of the sound generating device shown in FIG. 1;

5 is a schematic cross-sectional view taken along A-A in FIG. 4;

6 is a schematic sectional view taken along the line B-B in FIG. 4;

FIG. 7 is a schematic block diagram of an electronic device according to an embodiment of the present invention.

Reference sign description:

100-single shell; 110-second shell;

111-partition; 111a-partition body;

111b-through hole 111c-net cloth

120-first housing 130-sealing cover;

131-damping hole; 132-damping member;

140- the second cavity; 150- the first cavity;

151-vibration cavity; 152- sound absorption cavity;

141-air hole; 200-vibration component;

210-diaphragm; 220-voice coil;

230-reinforcing parts; 240-flexible circuit boards;

300-magnetic circuit assembly; 310-magnetic yoke;

320-center magnet; 330-center Washer;

340-side magnet; 351- first opening;

352-Second opening; 360-magnetic gap;

400- Sound-absorbing material.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that, unless specifically stated otherwise, 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.

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

Techniques, methods, and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, the techniques, methods, and equipment should be considered as part of the description.

In all examples shown and discussed herein, any specific value should be construed as exemplary only and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

1 to 6 are schematic structural diagrams of a sound generating device according to an embodiment of the present invention.

Referring to FIG. 1 to FIG. 6, the sound generating device according to the embodiment of the present invention may include a single casing 100, a vibration assembly 200, and a magnetic circuit assembly 300. The vibration assembly 200 includes a diaphragm 210 and a voice coil 220. The voice coil 220 is fixedly connected to the diaphragm 210 to drive the diaphragm 210 to vibrate through the voice coil 220, thereby urging the surrounding air to emit sound.

The unit case 100 includes a first case 120, a second case 110, and a sealing cover 130. The first casing 120 is used to connect and fix the vibration assembly 200 and the magnetic circuit assembly 300. The second casing 110 is mounted on a surface of the diaphragm 210 remote from the first casing 120.

The space between the second casing 110 and the diaphragm 210 forms a first cavity 150, which can also be referred to as a rear acoustic cavity. The second casing 110 and the sealing cover 130 cooperate to make it a closed cavity. The cavity 150 is filled with sound-absorbing material; the space between the first housing 120 and the diaphragm 210 and the magnetic circuit assembly 300 forms a second cavity 140, which can also be referred to as a front acoustic cavity. The second cavity 140 is provided with The air hole 141 communicated with the outside is used to transmit the sound wave of the vibration vibration of the diaphragm to the outside environment.

In an embodiment of the present invention, the second housing 110 may include a second housing body configured as a straight tube structure with two ends open, wherein the first end opening vibrates along the diaphragm 210 The direction is assembled with the diaphragm 210, and a sealing cover 130 is sealed at the other end, that is, the second end opening.

In this embodiment, the sealing cover 130 and the second housing body may be a separate structure, which is fixed by means of gluing or buckling, or an integral structure, that is, the sealing cover 130 and the second housing body. One-piece molding, such as thermoplastic molding or compression molding.

In this embodiment, a partition 111 is provided in the second casing body, and the partition 111 is disposed parallel to the diaphragm 210 and extends from one end of the second casing body to the other opposite side end. The cavity 150 is divided into a vibration cavity 151 opposite to the diaphragm 210 and a sound absorption cavity 152 disposed adjacent to the vibration cavity 151. The diaphragm 210 is used to surround the vibration cavity 151, that is, the diaphragm 210 vibrates in the second cavity 140 and the vibration cavity 151.

In this embodiment, the sound-absorbing material 400 is disposed in the sound-absorbing cavity 152, and the partition 111 has a communication hole that connects the vibration cavity 151 and the sound-absorbing cavity 152, so that the vibration cavity 151 and the sound-absorbing cavity 152 are combined together as the entire first A cavity 150 functions.

According to this embodiment of the present invention, dividing the first cavity 150 into two parts according to the functional settings will enable the diaphragm 210 and the sound absorbing material 400 to function in separate spaces, which is beneficial to the respective functions, especially It is to set a granular sound absorbing material, which can effectively prevent the sound absorbing material 400 from affecting the vibration of the diaphragm 210 when flowing.

In an embodiment of the present invention, referring to FIGS. 1 to 6, the partition 111 includes a partition body 111 a, a through hole 111 b penetrating the partition body 111 a, and a mesh cloth 111 c covering the through hole 111 b. The communication hole of the plate 111 includes a mesh hole of the mesh cloth 111c. In this embodiment, by providing a larger through hole 111b, the volume occupied by the first cavity 150 by the partition plate 111 can be reduced, and the sound absorption material 400 can be effectively isolated from entering the vibration cavity 151 by providing the mesh cloth 111c.

In this embodiment, the sound-absorbing material 400 may be sound-absorbing particles. Filling holes are provided in the sealing cover 130, and the sound-absorbing particles are filled through the filling holes to fill the sound-absorbing cavity 152 so as to fully fill the first cavity 150. Expansion. For example, the expansion can make the acoustic performance equivalent to 0.6cc of the first cavity by using the first cavity of 0.2cc. In this embodiment, the sound-absorbing particles are isolated from the vibration chamber 151 by the mesh cloth 111c, and are isolated from the external environment by a damping member covered at the filling hole.

In one embodiment of the present invention, when the sealing cover 130 and the second housing body are in a separate structure, the sound absorbing material 400 may be a sound absorbing cotton, which is filled in through the second end opening of the second housing body. .

In an embodiment of the present invention, the first cavity 150 may have a damping hole 131, and a damping member such as a mesh cloth is disposed on the damping hole 131. In this embodiment, the internal and external air pressure of the first cavity can be balanced by the damping hole 131 to maintain the symmetry of the amplitude of the diaphragm 210, thereby improving the acoustic performance.

In one embodiment of the present invention, the separator 111 may be made of a porous material, and the communication hole of the separator 111 may include a pore that the separator itself has.

In this embodiment, the porous material is a material that forms a network structure with pores that penetrate or close to each other, and the boundary or surface of the pores is formed by pillars or flat plates. A more typical porous structure is a two-dimensional structure formed by the aggregation of a large number of polygonal holes on a plane. It is called a honeycomb material because its shape is similar to the hexagonal structure of a honeycomb. Another more typical porous structure is composed of A large number of polyhedron-shaped holes form a three-dimensional structure, which is usually called a foam material. In addition, the porous material in the present invention specifically refers to a porous material with pores having an open-cell structure or a semi-open-cell or semi-closed-cell structure to ensure the permeability of the airflow, thereby obtaining the effect of increasing the volume of space that the airflow can reach.

In this embodiment, the porous material is, for example, a porous ceramic, a foamed plastic, or the like, wherein the porous ceramic may be a granular ceramic, a honeycomb ceramic, or a foamed ceramic.

According to this embodiment of the present invention, the use of a porous material for the separator 111 can minimize the occupation of the volume of the first cavity 150, and the internal pores are formed by its own pores. One is to increase the uniformity of air flow, and the other is There is no need to process the internal pores by additional means, which is helpful to simplify the production process.

In this embodiment, the voice coil 220 is located in the second cavity 140, which allows the voice coil 220 to quickly dissipate heat through the air hole 141, that is, in this embodiment, the air hole 141 can not only perform sound radiation as a sound hole, but also The heat dissipation of the voice coil 220 can be performed as a heat dissipation hole.

In this embodiment, in order to arrange components such as the voice coil 220 in the second cavity 140, the volume of the second cavity 140 needs to be increased to a certain extent relative to the prior art sound generating device. Therefore, in this embodiment, The first cavity 150 may be set to have a smaller volume, for example, less than 0.6cc (cubic centimeters). Further, the first cavity 150 may be in a range of 0.2cc to 0.3cc so as to substantially maintain the external dimensions of the sounding device of the embodiment of the present invention. The prior art sound generating device is unchanged or even smaller. In the prior art, the volume of the first cavity is usually 0.6cc to 0.8cc.

In this case, the sound generating device of the embodiment of the present invention is provided with a sound absorbing material 400 in the first cavity 150 for expansion, so as to maintain the sound performance of the embodiment of the present invention at least equivalent to the acoustic performance of the sound generating device of the prior art.

The sound absorbing material 400 may have any shape, such as a block shape, a sheet shape, a granular shape, or the like.

The sound-absorbing material 400 may be sound-absorbing cotton, non-foaming sound-absorbing particles, or the like.

The sound absorbing material 400 can be adhered and fixed on the cavity wall of the first cavity 150.

The sound absorbing material 400 may also be packaged in the first cavity 150 in a non-fixed structure.

According to this embodiment of the present invention, the voice coil 220 of the sound generating device is disposed in the second cavity 140 communicating with the outside through the air hole 141, which enables the hot air in the second cavity 140 located around the voice coil 220 to directly communicate with the outside air. Convection, in turn, helps to quickly reduce the temperature of the voice coil 220.

According to this embodiment of the present invention, the sound generating device realizes the expansion of the first cavity 150 by providing the sound absorbing material 400 in the first cavity 150, thereby ensuring the acoustic performance while controlling the actual volume of the first cavity 150. Basically unaffected. In an embodiment of the present invention, referring to FIG. 1 to FIG. 6, the sound generating device may include a magnetic circuit assembly 300, and the magnetic circuit assembly 300 is housed in the second cavity 140 so that the voice coil 220 is placed in the magnetic circuit assembly. 300 in the magnetic gap 360. In this embodiment, the air hole 141 includes an opening provided by the magnetic circuit assembly 300.

According to this embodiment of the present invention, the magnetic circuit assembly 300 is provided with an opening to form an air hole 141, and it is possible to omit an opening in the single-piece housing 100 to form an air hole.

According to this embodiment of the present invention, since the voice coil 220 is placed in the magnetic gap 360 formed by the magnetic circuit assembly 300 and the diaphragm 210 is disposed facing the magnetic circuit assembly 300, the magnetic circuit assembly 300 is provided with an opening to form an air hole 141 to allow air flow to circulate Smoother, which is more conducive to sound radiation and voice coil heat dissipation.

In an embodiment of the present invention, referring to FIG. 1 to FIG. 6, the magnetic circuit assembly 300 includes a central magnet 320 for forming a magnetic gap 360, wherein the magnetic gap 360 surrounds an outer periphery of the central magnet 320. In this embodiment, the opening provided by the magnetic circuit assembly 300 may include a first opening 351 penetrating the magnetic circuit assembly 300 along the vibration direction of the vibration assembly 200 at a central position of the center magnet 320.

In this embodiment, the first opening 351 communicates with the magnetic gap 360 where the voice coil 220 is located through the upper space between the magnetic circuit assembly 300 and the diaphragm 210, thereby realizing the heat between the hot air around the voice coil and the outside air. exchange.

In this embodiment, the central position of the center magnet 320 means that the first opening 351 penetrates the magnetic circuit assembly 300 through the inside of the center magnet 320.

For example, referring to FIG. 1 to FIG. 6, the magnetic circuit assembly 300 includes a magnetically conductive yoke 310, a central magnet 320, and a central washer 330. The magnetic circuit assembly 300 is fixedly connected to the unit case 100 through the magnetically conductive yoke 310. The center magnet 320 is disposed on the surface of the magnetic yoke 310 facing the diaphragm 210, the center washer 330 is disposed on the surface of the center magnet 320 facing the diaphragm 210, and the first opening 351 of the magnetic circuit assembly 300 vibrates along the vibration assembly The direction runs through the center washer 330, the center magnet 320, and the yoke 310 in this order.

In this example, the magnetic circuit assembly 300 may include a side magnet 340, and the side magnet 340 is disposed around the center magnet 320 on the magnetic yoke 310, and a ring-shaped magnetic gap 360 is formed between the center magnet 320 and the side magnet 340.

In this example, the magnetic circuit assembly 300 may also be omitted from providing side magnets. Instead, the yoke 310 has a side wall portion bent toward the diaphragm 210 to form a ring shape between the side wall portion and the center magnet 320. Magnetic gap 360.

In an embodiment of the present invention, referring to FIG. 1 to FIG. 6, the opening provided by the magnetic circuit assembly 300 may further include a second opening 352 provided corresponding to the magnetic gap 360 and communicating with the first opening 351.

In this embodiment, the magnetic gap 360 can directly communicate with the outside through the second opening 352, thereby realizing heat exchange between the hot air around the voice coil and the outside air.

For example, referring to FIG. 1 to FIG. 6, the magnetic circuit assembly 300 includes a magnetically conductive yoke 310. The magnetically conductive yoke 310 is a flat plate. The magnetic circuit assembly 300 is fixedly connected to the unit case 100 through the magnetically conductive yoke 310. In this example, the second opening 352 of the magnetic circuit assembly 300 may be a through hole provided on the magnetic yoke 310 or a cutout provided on an edge portion of the magnetic yoke 310.

In an embodiment of the present invention, the first housing 120, the diaphragm 210, and the second housing 110 can be assembled in the vibration direction of the diaphragm 210 in sequence, that is, the magnetic circuit assembly is first assembled in the first housing 120. 300, and then the vibration assembly 200 containing the diaphragm 210 is assembled in the first case 120, and finally the second case 110 is assembled on the side of the diaphragm 210 away from the first case 120. This embodiment facilitates the flow of water. Operation, improve assembly efficiency.

In this embodiment, the lateral dimensions of the first casing 120 and the second casing 110 do not exceed the lateral dimensions of the diaphragm 210.

In one embodiment of the present invention, the single-piece housing 100 may be composed of at least two parts, so as to facilitate the assembly of the internal vibration component 200, magnetic circuit component 300, sound-absorbing material 400, and the like.

As shown in FIG. 1 to FIG. 6, in an example of the present invention, the sound generating device includes a single housing 100, a vibration assembly 200, a magnetic circuit assembly 300, and a sound absorbing material 400.

The vibration assembly 200 and the magnetic circuit assembly 300 are housed in the inner cavity of the unit case 100.

In this example, the single case 100 includes a second case 110, a first case 120, and a sealing cover 130. The second case 110 includes a second case body, and the second case body is a straight-cylinder type with both ends open. In the structure, the diaphragm 210 is sandwiched between the openings of one end of the first casing 120 and the second casing body, and then the inner cavity of the single-piece casing 100 is divided into a second cavity 140 and a first cavity 150, and a sealing cover 130. The second end of the second casing body is sealed to seal the first cavity 150, and the space between the magnetic circuit assembly 300 and the first casing 120 is the second cavity 140.

The second casing 110 further includes a partition 111, and the partition 111, the diaphragm 210, and the second casing body collectively surround the vibration cavity 151; the partition 111, the sealing cover 130, and the second casing body collectively surround the sound absorption cavity. 152.

The partition plate 111 may be integrally formed with the second housing body, or may be fixedly connected together by means of bonding, welding, or the like after being separately molded.

In this example, the vibration assembly 200 and the magnetic circuit assembly 300 may be assembled in the first casing 120 first; then the second casing 110 is assembled on the first casing 120 so that the diaphragm 210 is sandwiched in the first casing. Between the edge of the body 120 and the edge of the second casing 110; then the second casing 110 is filled with a sound-absorbing material 400, such as sound-absorbing cotton; finally, the sealing cover 130 is fastened on the second casing 110 To complete the assembly of the sound generator.

In another example, the sealing cover 130 is integrated with the second housing body. A filling hole is formed in the sealing cover 130. The sound absorbing material 400 is a sound absorbing particle, and the sound absorbing particles are poured into the sound absorbing through the filling hole. In the cavity 152, until the sound absorbing cavity 152 is filled with the sound absorbing particles, a damping member is assembled at the filling hole to complete the assembly of the sound generating device.

In this example, the first case 120 may be a conventional plastic case or the like. In another example, because the first shell 120 is used to surround the second cavity 140, the first shell 120 may be made of a porous material, so that the air hole 141 of the second cavity 140 may further include a first The gap of the casing 120 further improves the heat dissipation effect.

In this example, the vibration assembly 200 includes a diaphragm 210, a voice coil 220, a reinforcement portion (DOME) 230, and a flexible circuit board (FPCB) 240.

The flexible circuit board 240 is fixedly connected to the surface of the diaphragm 210 located in the second cavity 140, the voice coil 220 is fixedly connected to the flexible circuit board 240, and the reinforcing portion 230 is fixedly connected to the diaphragm 210 in the first cavity 150. on the surface.

In this example, the flexible circuit board 240 is used to connect the voice coil 220 with an external circuit to provide an AC signal to the voice coil 220 through the external circuit.

The flexible circuit board 240 may have two pairs of pads. The two pads of the first pair of pads are electrically connected by a printed wire, and the two pads of the second pair of pads are electrically connected by another printed wire. The voice coil 220 The two voice coil leads are soldered to one of the first pair of pads and one of the second pair of pads, and the other of the first pair of pads and the other pair of pads It is exposed to the outside through the unit case 100 to connect an external circuit.

In this example, the magnetic circuit assembly 300 includes a magnetic yoke 310, a center magnet 320, a center washer 330, and four side magnets 340.

The center magnet 320 and the four side magnets 340 are fixedly connected to the surface of the magnetic yoke 310 facing the diaphragm 210, and the center washer 320 is fixedly connected to the surface of the center magnet 320 facing the diaphragm 210. The four side magnets 340 It is arranged around the center magnet 320 to form a ring-shaped magnetic gap 360 between the four side magnets 340 and the center magnet 320, and the voice coil 220 is placed in the magnetic gap 360.

The yoke 310 has a flat plate shape, and a notch is formed at each of four corners to form a second opening 352 at the bottom of the magnetic gap 360.

The magnetic circuit assembly 300 has a first opening 351 penetrating the center washer 330, the center magnet 320, and the magnetic yoke 310 in this order. That is, the magnetic yoke 310 has a through hole 311, the center magnet 320 has a through hole 321, and the center washer 330 has a through hole. The holes 331, the through

holes

311, 321, and 331 penetrate each other in the vibration direction of the diaphragm 210 to form a first opening 351.

In this example, the air hole 141 of the second cavity 140 communicating with the outside includes at least the first opening 351 and the second opening 352.

In this example, the damping hole 131 of the first cavity 150 is disposed on the sealing cover 130. For example, a damping member 132 of mesh is connected to the sealing cover 130 to cover the damping hole 131.

As shown in FIG. 7, an electronic device 7000 according to an embodiment of the present invention includes a sound generating device according to any embodiment of the present invention, which is labeled 7010 in FIG. 7.

According to this embodiment of the present invention, the electronic device 7000 can output voice by setting a sound generating device 7010, and the speaker 7010 has better heat dissipation performance than the prior art, which can not only control the heat generation of the electronic device 7000, but also perform audio and video Provides high volume during playback to meet user needs.

In an embodiment of the present invention, the electronic device 7000 may further include one or more processors 7020 and one or more memories 7030. The memory 7030 is configured to store instructions, and the instructions are used to control the processor 7020 to perform operations to implement the functions of the electronic device 700.

In an embodiment of the present invention, the electronic device 7000 may further include an interface device 7040, a communication device 7050, a display device 7060, an input device 7070, a microphone 7080, and the like.

The interface device 7040 includes, for example, a USB interface, a headphone interface, and the like. For example, the communication device 7050 can perform wired or wireless communication, and specifically may include Wifi communication, Bluetooth communication, 2G / 3G / 4G / 5G communication, and so on. The input device 7070 may include, for example, a touch screen, a keyboard, a mouse, a somatosensory input, and the like. The microphone 7080 is used to receive input voice information and the like.

Although FIG. 7 shows a plurality of devices of the electronic device 7000, the electronic device according to the embodiment of the present invention may include only a part of the devices, such as a sound generating device 7010 and the like.

The electronic device 7000 according to the embodiment of the present invention may be any device that needs to provide a voice output function, such as a mobile phone, a notebook computer, a wearable device, and a tablet computer.

The above embodiments mainly describe the differences from other embodiments, but those skilled in the art should clearly understand that the above embodiments can be used individually or in combination with each other as needed.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A sound generating device includes a first housing, a magnetic circuit component and a vibration component connected and fixed to the first housing. The vibration component includes a diaphragm, which is characterized in that:

A second housing is installed on a surface of the diaphragm far from the first housing; a space between the second housing and the diaphragm forms a first cavity, and the first The cavity is filled with sound-absorbing material; a space between the diaphragm, the first housing, and the magnetic circuit component forms a second cavity; the second cavity is provided with air holes communicating with the outside, and The sound waves of the diaphragm's vibration radiation are transmitted to the external environment.
The sound generating device according to claim 1, wherein the second housing comprises a second housing body, and the second housing body is configured as a straight tube structure with two ends open, and the first end is open The diaphragm is assembled with the diaphragm along the vibration direction of the diaphragm, and a sealing cover is sealed at the second end opening.
The sound generating device according to claim 2, wherein the sealing cover and the second housing body are separate structures and fixed by being glued together; or, the sealing cover and the second shell The body is integrally formed.
The sound emitting device according to claim 2 or 3, wherein a partition is provided in the second casing body; and the partition extends from one end of the second casing body to the other opposite The side end of the first cavity is divided into a vibration cavity opposite to the diaphragm and a sound absorption cavity disposed adjacent to the vibration cavity.
The sound-emitting device according to claim 4, wherein the sound-absorbing material is disposed in the sound-absorbing cavity, and the partition plate has a communication hole communicating the vibration cavity and the sound-absorbing cavity.
The sound generating device according to claim 5, wherein the partition comprises a partition body, a through hole provided on the partition body, and a mesh covering the through hole, and the communication hole includes The mesh of the mesh.
The sound generating device according to claim 5, wherein the partition is made of a porous material, and the communication hole includes a pore having the partition itself.
The sound generating device according to claim 6, wherein the sound absorbing material is a sound absorbing particle, and a filling hole is formed in the sealing cover, and the sound absorbing particle is filled from the filling hole to fill the sound Sound absorption cavity; the sound absorption particles are isolated from the vibration cavity by the mesh cloth, and are isolated from the external environment by a damping member covered at the filling hole.
The sound-emitting device according to claim 2, wherein the sound-absorbing material is a sound-absorbing cotton, and the sound-absorbing cotton is filled in from the second end opening of the second casing body.
The sound generating device according to claim 1, wherein the air hole includes an opening provided by the magnetic circuit component; and the opening includes a vibration along the vibration component at an intermediate portion of a central magnet of the magnetic circuit component. The direction penetrates the first opening of the magnetic circuit assembly.
The sound emitting device according to claim 10, wherein the opening further comprises a second opening provided corresponding to the magnetic gap and communicating with the first opening.
The sound generating device according to claim 1, wherein the first casing, the diaphragm, and the second casing are sequentially assembled in a vibration direction of the diaphragm, and the first casing The lateral dimension of the body and the second casing does not exceed the lateral dimension of the diaphragm.
The sound generating device according to claim 1, wherein the volume of the first cavity is less than 0.6 cm3.
An electronic device, comprising the sound generating device according to any one of claims 1-13.