WO2021196766A1

WO2021196766A1 - Sound producing device and electronic apparatus

Info

Publication number: WO2021196766A1
Application number: PCT/CN2020/138576
Authority: WO
Inventors: 王宇; 陈国强; 陈阿亮; 刘广福
Original assignee: 歌尔股份有限公司
Priority date: 2020-03-30
Filing date: 2020-12-23
Publication date: 2021-10-07
Also published as: CN113473322A

Abstract

Disclosed is a sound producing device. The sound producing device comprises a housing and a sound producing unit. A cavity is formed in the housing, and the sound producing unit is disposed in the cavity. At least part of the housing is configured to be a composite-material member comprising a protective layer and a thermally conductive layer. The protective layer and the thermally conductive layer are stacked in a direction from the inside to the outside of the housing. The rigidity of the protective layer is greater than that of the thermally conductive layer, and the thermal conductivity coefficient of the protective layer is less than that of the thermally conductive layer. The housing has improved thermal conductivity while maintaining the strength thereof, thus allowing the sound producing unit to quickly dissipate heat during operation, keeping the operating temperature low so as to prevent high temperature from affecting the operational performance of the sound producing unit, and accordingly improving the acoustic performance of the sound producing unit and acquiring good acoustic effects.

Description

Sound device and electronic equipment

Technical field

The present invention relates to the technical field of acoustics, in particular to a sound generating device and electronic equipment.

Background technique

The sound emitting device usually includes a housing and a sounding monomer. The sounding monomer is arranged in a cavity enclosed by the housing. The sounding monomer is used to convert electrical energy into kinetic energy, drive the gas to vibrate, and radiate sound outward. The sound-emitting unit heats up during operation, and the temperature rise may cause the sound-generating parts in the sound-generating unit to be thermally deformed, thereby affecting its acoustic performance, resulting in poor sounding effects of the sound-generating device.

Summary of the invention

In order to solve the above-mentioned technical problems, the main purpose of the present invention is to provide a sound generating device with good heat dissipation effect of the casing and capable of improving acoustic performance.

The present invention provides a sound emitting device, including:

A housing in which a cavity is formed; and,

The vocal monomer is arranged in the cavity;

Wherein, at least a part of the housing is set as a composite material piece, the composite material piece includes a protective layer and a heat conductive layer, and in a direction outward from the inside of the housing, the protective layer and the heat conductive layer The layers are arranged in a layered arrangement, the rigidity of the protective layer is greater than that of the thermally conductive layer, and the thermal conductivity of the protective layer is smaller than that of the thermally conductive layer.

In one embodiment, the density of the protective layer is greater than that of the thermally conductive layer.

In one embodiment, the material of the protective layer is steel, and the material of the heat conducting layer is aluminum or graphite.

In an embodiment, the protective layer is provided in multiples, and the multiple protective layers include a first steel layer and a second steel layer, and the heat conducting layer is provided on the first steel layer and the second steel layer. Between layers.

In an embodiment, the ratio of the thickness of the first steel layer or the second steel layer to the thickness of the thermally conductive layer is not less than 0.4:1 and not more than 0.6:1.

In an embodiment, the thickness ratio between the first steel layer, the second steel layer, and the heat conducting layer is 0.5:1:0.5.

In an embodiment, the housing includes a plastic part, the plastic part is provided with an opening, the composite material part is arranged to cover the opening, and the peripheral side of the composite material part is embedded in the plastic Piece.

In one embodiment, the composite material part is embedded in the plastic part by injection molding.

In an embodiment, the vocal monomer separates the cavity to form a front acoustic cavity and a rear acoustic cavity that are arranged in a front-to-rear direction, the composite material piece is provided with two, and the two composite material pieces are respectively provided The two sides of the shell in the front and back upward direction are arranged opposite to the front and rear ends of the sound emitting unit.

The present invention also provides an electronic device, including the above-mentioned sound emitting device.

The present invention provides a sound generating device. At least a part of the housing of the sound generating device is set as a composite material piece. The composite material piece includes a protective layer and a heat conductive layer. It is arranged in layers, the rigidity of the protective layer is greater than that of the heat-conducting layer, and the thermal conductivity of the protective layer is smaller than that of the heat-conducting layer. Due to the strong rigidity of the protective layer, the composite material part has better anti-deformation performance, which can better protect the sound monomer in the shell, and the thermal conductivity of the heat conduction layer is higher, which makes the overall thermal conductivity of the composite material part better. , In this way, the shell has better thermal conductivity under the premise of ensuring the strength, so that the vocal unit can quickly dissipate heat during operation, and the working temperature is maintained at a low level, avoiding high temperature affecting the performance of the vocal unit, thereby improving Acoustic performance of the vocal monomer, to obtain a better acoustic effect.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

FIG. 1 is a schematic diagram of a three-dimensional structure of an embodiment of a sound generating device provided by the present invention;

FIG. 2 is a schematic diagram of a three-dimensional structure of the sound generating device in FIG. 1 from another angle;

Figure 3 is a top view of the sounding device in Figure 1;

Figure 4 is a front view of the sounding device in Figure 1;

Figure 5 is an A-A cross-sectional view of the sounding device in Figure 4;

Fig. 6 is an enlarged schematic view of the composite material part in Fig. 5.

Attached icon number description:

标号Label	名称 name	标号Label		名称name
11	壳体case	111111	第一钢层The first steel layer
22	发声单体 Vocal monomer	112112	第二钢层 Second steel layer
1010	复合材料件 Composite parts	1313	塑料件 Plastic parts
1111	防护层 Protective layer	3131	前声腔Front vocal cavity
1212	导热层Thermal conductive layer	3232	后声腔Back cavity

The realization of the objectives of the present invention, functional characteristics and excellent effects will be further described below in conjunction with specific embodiments and drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that if there is a directional indication involved in the embodiment of the present invention, the directional indication is only used to explain the relative positional relationship, movement, etc. between the components in a specific posture, if the specific posture changes , The directional indication changes accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as instructions or implications. Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and/or" in the full text includes three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or schemes that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the protection scope of the present invention.

The present invention provides a sound emitting device and an electronic product with the sound emitting device. The electronic product can be, but is not limited to, mobile phones, televisions, computers, speakers, etc. The main improvement point of the present invention is to improve the sound emitting device, the following combination The sound device provided by the present invention is introduced and explained in detail.

The present invention provides a sounding device. Please refer to FIGS. 1 to 5. The sounding device includes a housing 1 and a sounding monomer 2. A cavity is formed in the housing 1, and the sounding monomer 2 is arranged in the cavity.

The vocal unit 2 can be, but is not limited to, a moving coil type unit, a capacitive type unit, a piezoelectric type unit, an electromagnetic type unit, an electric ion type unit or a pneumatic type unit. For example, in a moving coil type unit, the sound-emitting unit 2 includes a magnetic circuit system and a vibration system. The vibration system includes a sounding part and a conversion part. The vocal part is used for vibrating sound. The conversion part is used to convert electrical energy into kinetic energy. The vocal part is the diaphragm of the moving iron type monomer, the diaphragm of the moving coil type monomer, and so on. The conversion part is a coil, an armature, etc. When working, the coil responds to the electric signal of the external circuit and moves in the magnetic field of the magnetic circuit system, and drives the vocal part to vibrate. The vibrating part drives the gas to vibrate, thereby radiating sound outward. During the working process of the sounding monomer 2, heat will be generated, which will cause the temperature in the cavity to rise, which may cause deformation of the components in the sounding monomer 2, thereby affecting its acoustic performance.

To this end, please refer to Figures 4 to 6. In the sound device provided by the present invention, at least a part of the housing 1 is configured as a composite material 10, and the composite material 10 includes a protective layer 11 and a thermally conductive layer 12, and a protective layer 11 and The heat-conducting layer 12 is arranged in layers in the direction outward from the inside of the casing 1, the rigidity of the protective layer 11 is greater than that of the heat-conducting layer 12, and the thermal conductivity of the protective layer 11 is smaller than that of the heat-conducting layer 12. Due to the strong rigidity of the protective layer 11, the composite material part 10 has better anti-deformation performance, which can better protect the sound-producing monomer 2 in the housing 1, and the thermal conductivity layer 12 has a higher thermal conductivity, which makes the composite material part 10 The overall thermal conductivity is better. In this way, the housing 1 has better thermal conductivity under the premise of ensuring the strength, so that the sound monomer 2 can quickly dissipate heat during operation, and the working temperature is maintained at a low level to avoid the effect of high temperature. The working performance of the monomer 2, thereby improving the acoustic performance of the sound-producing monomer 2, and obtaining a better acoustic effect.

The protective layer 11 and the heat-conducting layer 12 can be made of multiple materials. Generally speaking, the protective layer 11 is preferably a material with strong resistance to deformation and durability, as long as it can protect the internal parts of the housing 1, for example, Stainless steel, cold rolled steel or iron, etc. The thermal conductive layer 12 is preferably a material with light weight and good thermal conductivity, such as copper, aluminum or graphite.

In one embodiment, the density of the protective layer 11 is greater than that of the thermally conductive layer 12. In this way, the overall density of the composite material piece 10 is lowered, and the weight of the composite material piece 10 is reduced, which is beneficial to the lighter weight of the sound generating device, so that the overall weight of the housing 1 is lighter and the thermal conductivity is better.

Preferably, the material of the protective layer 11 is steel, including but not limited to materials with strong rigidity and durability such as stainless steel and cold-rolled steel. The material of the thermal conductive layer 12 is aluminum or graphite, which has good thermal conductivity and low density. In this embodiment, aluminum may be pure aluminum or aluminum alloy, as long as it contains aluminum and has a higher thermal conductivity than steel. Taking the protective layer 11 of stainless steel and the thermal conductive layer 12 of aluminum as an example, the thermal conductivity λ of stainless steel is about 15-20, and the thermal conductivity λ of aluminum is about 150-230, which is about 10 times that of stainless steel. Compared with the single stainless steel housing 1, the performance of the heat conduction uniformity and speed of the composite material 10 is improved, which greatly improves the temperature rise effect of the sound generating device, thereby greatly improving the acoustic performance. And the density of stainless steel is about 7.9g/cm ³ , and the density of aluminum is about 2.7g/cm ³ , so that the overall density of the composite material 10 is reduced and the quality is reduced, thereby reducing the overall weight of the sound device, which is beneficial to the electronic equipment Lightweight.

On the basis of the previous embodiment, the protective layer 11 is provided in multiples, and the multiple protective layers 11 include a first steel layer 111 and a second steel layer 112, and the heat conducting layer 12 is provided on the first steel layer 111 and the second steel layer. Between 112. As a result, the thermal conductive layer 12 is protected by the first steel layer 111 and the second steel layer 112 in the middle, which further improves the anti-deformation performance of the composite material 10, avoids damage to the thermal conductive layer 12, and prolongs the service life of the housing 1.

On the basis of the previous embodiment, it can be understood that when the thickness of the thermally conductive layer 12 relative to the protective layer 11 is too large, the deformation resistance of the composite material part 10 cannot be guaranteed, and when the thickness of the thermally conductive layer 12 relative to the protective layer 11 is too small , Which may lead to the inability to significantly improve the thermal conductivity of the housing 1. For this reason, the thickness ratio between the thickness of the first steel layer 111 or the second steel layer 112 and the thermal conductive layer 12 is not less than 0.4:1 and not more than 0.6:1. Within this range, the composite On the premise that the material piece 10 has sufficient strength, the temperature rise performance of the housing 1 is significantly improved, thereby improving the acoustic performance of the sound generating device. Preferably, the thickness ratio between the first steel layer 111, the second steel layer 112, and the heat conducting layer 12 is 0.5:1:0.5.

Since the composite material part 10 is arranged in multiple layers, it is not easy to bend or be formed into an irregular shape. Therefore, in this embodiment, referring to FIG. 5, the housing 1 includes a plastic part 113, which is provided with For the opening, the composite material part 10 is arranged to cover the opening, and the peripheral side of the composite material part is embedded in the plastic part 113. In this way, the plastic part 113 is used to make the irregularly shaped or bent part of the shell 1, while the composite material part 10 is in a regular flat shape and is embedded in the plastic part 113, which is beneficial to the overall manufacture and molding of the shell 1 .

Specifically, the composite material part 10 is embedded in the plastic part by injection molding. In this way, the sealing performance of the entire casing is ensured.

On the basis of the previous embodiment, the sound-producing monomer 2 separates the cavities to form a front acoustic cavity 31 and a rear acoustic cavity 32 arranged in a front-to-back direction. There are two composite material parts 10, and the two composite material parts 10 are respectively Located on the front and back sides of the housing 1, the two composite material pieces 10 are arranged opposite to the front and rear ends of the sound emitting monomer 2 respectively. In this way, the composite material 10 is arranged in the thickness direction of the sounding device. On the one hand, the distance between the composite material 10 and the sounding monomer 2 is shortened, which is conducive to heat conduction and dissipation along a shorter path. On the other hand, due to the composite The material part 10 has a flatter shape relative to the plastic part 113, which is beneficial to reduce the overall thickness of the housing 1, thereby reducing the overall volume of the sound generating device.

The above are only the preferred embodiments of the present invention and do not limit the scope of the present invention. Any equivalent structure made using the content of the description and drawings of the present invention, or directly or indirectly used in other related technical fields, is the same. The rationale is included in the scope of patent protection of the present invention.

Claims

A sound generating device, characterized in that it comprises:

A housing in which a cavity is formed; and,

The vocal monomer is arranged in the cavity;

Wherein, at least a part of the housing is set as a composite material piece, the composite material piece includes a protective layer and a heat conductive layer, and in a direction outward from the inside of the housing, the protective layer and the heat conductive layer The layers are arranged in a layered arrangement, the rigidity of the protective layer is greater than that of the thermally conductive layer, and the thermal conductivity of the protective layer is smaller than that of the thermally conductive layer.
The sound emitting device of claim 1, wherein the density of the protective layer is greater than that of the thermally conductive layer.
The sound generating device according to claim 1, wherein the material of the protective layer is steel, and the material of the heat conducting layer is aluminum or graphite.
The sounding device according to any one of claims 1 to 3, wherein the protective layer is provided in multiples, and the multiple protective layers include a first steel layer and a second steel layer, and the thermally conductive layer is provided with Between the first steel layer and the second steel layer.
The sound emitting device according to claim 4, wherein the ratio of the thickness of the first steel layer or the second steel layer to the thickness of the heat conducting layer is not less than 0.4:1 and not more than 0.6: 1.
7. The sound emitting device of claim 5, wherein the thickness ratio between the first steel layer, the second steel layer, and the heat conducting layer is 0.5:1:0.5.
The sounding device according to claim 1, wherein the housing comprises a plastic part, the plastic part is provided with an opening, the composite material part is arranged to cover the opening, and the composite material part The peripheral side is embedded in the plastic part.
8. The sound generating device of claim 7, wherein the composite material part is embedded in the plastic part by injection molding.
The sound emitting device according to claim 8, wherein the sound emitting monomer separates the cavity to form a front sound cavity and a rear sound cavity that are arranged in a forward and backward direction, and the composite material is provided with two, so The two composite material pieces are respectively arranged on the front and rear sides of the housing, and are arranged opposite to the front and rear ends of the sound-producing monomer.
An electronic device, characterized by comprising the sound emitting device according to any one of claims 1 to 9.