WO2022068012A1

WO2022068012A1 - Diaphragm and sound producing device

Info

Publication number: WO2022068012A1
Application number: PCT/CN2020/129789
Authority: WO
Inventors: 令狐荣林; 章统; 肖波; 孔晨亮
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-09-29
Filing date: 2020-11-18
Publication date: 2022-04-07
Also published as: CN112261548A

Abstract

Provided is a diaphragm, which comprises an adhesive layer and a first substrate layer and second substrate layer that are adheringly fixed on two opposite sides of the adhesive layer, respectively; the first substrate layer and/or the second substrate layer are/is recessed near a side of the adhesive layer in the direction away from the adhesive layer so as to form holes; the adhesive layer comprises an adhesive layer body and protruding columns that protrudingly extend from the adhesive layer body; the first substrate layer and the second substrate layer are attached on two opposite sides of the adhesive layer body, respectively, and enable the protruding columns to be embedded in the holes so that the adhesive layer, the first substrate layer, and the second substrate layer form an integrated structure. Further provided is a sound producing device in which the diaphragm is applied. Compared with the related technology, there is little difference in the characteristics of the material of each layer of the diaphragm of the present invention, material nonlinearity is weak, and reliability is high. In addition, the acoustic performance of the sound producing device of the present invention is good.

Description

Diaphragm and sound device

technical field

The invention relates to the field of electro-acoustic conversion, in particular to a vibrating film and a sound-emitting device used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is the high-quality music function. Therefore, sound-generating devices for playing sound are widely used in smart mobile devices. The sound-generating device includes a diaphragm for vibrating and producing sound, and the acoustic performance of the diaphragm is an important performance of the sound-generating device.

The vibrating film of the related art includes an adhesive layer, and a first base material layer and a second base material layer which are respectively pasted and fixed on opposite sides of the adhesive layer.

However, in the related art, the sequentially stacked first base material layer, adhesive layer and second base material layer of the diaphragm form a composite structure material, and the composite structure can withstand extreme working conditions (such as high temperature, low temperature, vibration, etc.) large amplitude) there is a risk of interlayer separation, making the diaphragm less reliable. In addition, since the elastic modulus of the first base material layer and the elastic modulus of the second base material layer are both much larger than the elastic modulus of the adhesive layer, the damping characteristics of the first base material layer and the damping characteristics of the second base material layer However, the characteristics are far less than the damping characteristics of the adhesive layer, which makes the performance of the diaphragm material change drastically along the thickness direction, the diaphragm material is nonlinear, and the amplitude is asymmetric when the diaphragm vibrates, so that the distortion of the sound-emitting device is high. , so that the acoustic performance of the sound-emitting device cannot achieve the desired effect.

Therefore, it is necessary to provide a new vibrating film and sound-generating device to solve the above-mentioned technical problems.

technical problem

The purpose of the present invention is to provide a diaphragm with small difference in material properties of each layer, weak material nonlinearity, high reliability, and a sound-emitting device with good acoustic performance.

technical solutions

In order to achieve the above purpose, the present invention provides a vibrating film, which comprises an adhesive layer and a first base material layer and a second base material layer which are respectively pasted and fixed on opposite sides of the adhesive layer, and the first base material is The side of the material layer and/or the second base material layer close to the adhesive layer is recessed in a direction away from the adhesive layer to form a hole, and the adhesive layer includes an adhesive layer body and a hole formed by the adhesive layer. The first base material layer and the second base material layer are respectively attached to opposite sides of the adhesive layer body, and the convex posts are embedded in the holes, so as to The adhesive layer, the first base material layer and the second base material layer form an integrated structure.

Preferably, the protrusions include a plurality of protrusions, and the plurality of protrusions are distributed in an array.

Preferably, the holes are formed on the sides of the first base material layer and the second base material layer close to the adhesive layer, and the protruding posts include a side close to the first base material layer. The first protruding post that protrudes and extends and the second protruding post that protrudes and extends from one side of the second substrate layer, each of the first protruding posts and the corresponding one of the second protruding posts are disposed on the opposite side. opposite sides of the adhesive layer body.

Preferably, the holes penetrate through the first substrate layer and/or the second substrate layer.

Preferably, the holes penetrate through the first base material layer and the second base material layer, and the surface of the first convex post on the side away from the adhesive layer body is away from the first base material layer body The surface of the side of the adhesive layer body is flush; the surface of the second protrusion on the side away from the adhesive layer body and the surface of the second substrate layer body away from the adhesive layer body flush.

Preferably, the diaphragm is made by liquefaction injection curing process.

Preferably, the adhesive layer is made of any one of acrylic acid, rubber and silica gel, and the first substrate layer is polyethylene terephthalate, polyetheretherketone, polyetherimide The second base material layer is made of any one of polyethylene terephthalate, polyether ether ketone and polyether imide.

The present invention also provides a sound-generating device, which includes a vibration system and a magnetic circuit system that drives the vibration system to vibrate and sound, and the vibration system includes the diaphragm.

beneficial effect

Compared with the related art, the vibrating membrane and the sound-emitting device of the present invention are arranged in the structure of the vibrating membrane as the first base material layer, the adhesive lamination and the second base material layer stacked in sequence, and the adhesive layer body of the adhesive layer A convex column is arranged to extend, and at the same time, the first base material layer and/or the second base material layer are concave to form a hole, and the first base material layer and the second base material layer are respectively attached to the adhesive layer. The two sides of the body are opposite to each other and the protruding posts are embedded in the holes, so that the adhesive layer, the first base material layer and the second base material layer form an integrated structure. Because the adhesive layer is respectively embedded into the first base material layer and the second base material layer to form a whole, on the one hand, this structure can improve the shear performance between the layers of the diaphragm, and the ability of the diaphragm to resist peeling and delamination is improved. , so that the reliability of the diaphragm is high; on the other hand, the difference in material properties such as elastic modulus and damping of each layer of the diaphragm is reduced, thereby reducing the nonlinearity of the material along the thickness direction and improving the amplitude symmetry of the diaphragm , the distortion of the sound-emitting device can be reduced, so that the acoustic performance of the sound-emitting device is good.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the three-dimensional structure schematic diagram of the vibrating film of the present invention;

Fig. 2 is the partial three-dimensional structure exploded view of the vibrating membrane of the present invention;

Fig. 3 is a sectional view along line A-A in Fig. 1;

FIG. 4 is a schematic diagram of the three-dimensional structure of the sound-emitting device of the present invention.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please also refer to FIGS. 1-3 , the present invention provides a diaphragm 100 . The vibrating membrane 100 includes an adhesive layer 1 and a first substrate layer 2 and a second substrate layer 3 respectively pasted and fixed on opposite sides of the adhesive layer 1 .

The adhesive layer 1 and the first base material layer 2 and the second base material layer 3 are respectively pasted and fixed by means of adhesive or resin curing. Of course, other adhesive fixing methods are also possible.

Specifically, the adhesive layer 1 includes an adhesive layer body 11 and a first protruding post 121 and a second protruding post 122 extending from the adhesive layer body 11 . In this embodiment, the protruding post 12 includes a first protruding post 121 protruding from a side close to the first base material layer 2 and a second protruding post 121 extending from a side of the second base material layer 3 . studs 122 .

The first substrate layer 2 and the second substrate layer 3 are both substrates commonly used in the art, and the specific models and parameters can be selected and used by those skilled in the art according to actual needs, and will not be described in detail here.

The side of the first substrate layer 2 and/or the second substrate layer 3 close to the adhesive layer 1 is recessed in a direction away from the adhesive layer 1 to form a hole 10 . In this embodiment, the holes 10 are formed on the sides of the first base material layer 2 and the second base material layer 3 close to the adhesive layer 1 . The holes 10 penetrate through the first base material layer 2 and/or the second base material layer 3 . The hole 10 is used to form a fixing structure with the protruding post 12 .

The first base material layer 2 and the second base material layer 3 are respectively attached to opposite sides of the adhesive layer body 11 so that the protruding posts 12 are embedded in the holes 10 . Specifically, the first protrusions 121 are embedded in the first base material layer 2, and the second protrusions 122 are embedded in the second base material layer 3, so that the adhesive layer 1, the The first base material layer 2 and the second base material layer 3 form an integrated structure. The manufacturing process of this structure is simple, and the integrated structure formed by the adhesive layer 1 , the first base material layer 2 and the second base material layer 3 is strong and reliable, so that the various layers of the diaphragm 100 are combined The strength is high, and the shear performance between the layers of the diaphragm 100 is improved, and the anti-peeling and anti-delamination capabilities of the diaphragm 100 are improved, so that the reliability of the diaphragm 100 is high.

Wherein, since the elastic modulus of the first base material layer 2 and the elastic modulus of the second base material layer 3 are both greater than the elastic modulus of the adhesive layer 1, the first base material layer 2 Both the damping characteristics of the second base material layer 3 and the damping characteristics of the second base material layer 3 are smaller than the damping characteristics of the adhesive layer 1 . In this structure, the first base material layer 2 wraps the first protrusions 121 and the second base material layer 3 wraps the second protrusions 122, so that the first base material layer 2 The difference between the elastic modulus of the second base material layer 3 and the elastic modulus of the adhesive layer 1 is reduced, and the damping characteristics of the first base material layer 2 and the first base material layer 2 are reduced. The difference between the damping characteristics of the two base material layers 3 and the damping characteristics of the adhesive layer 1 is reduced, thereby reducing the nonlinearity of the material of the diaphragm 100 along the thickness direction and improving the amplitude symmetry of the diaphragm 100 .

In this embodiment, the protrusions 12 include a plurality of protrusions 12 , and the protrusions 12 are distributed in an array. The first protrusions 121 include a plurality of them. A plurality of the first convex pillars 121 are distributed in a matrix. The second protrusions 122 include a plurality of them. A plurality of the second convex pillars 122 are distributed in a matrix. The plurality of the first protrusions 121 and the plurality of the second protrusions 122 make the integrated structure formed by the adhesive layer 1 , the first substrate layer 2 and the second substrate layer 3 more compact. Therefore, the anti-peeling and anti-delamination capabilities of the diaphragm 100 are improved, and the uniformity of the structural material is good, and the acoustic performance of the diaphragm 100 can be improved when vibrating and producing sound.

In order to improve the uniformity of the material of the diaphragm 100 , each of the first protrusions 121 and a corresponding one of the second protrusions 122 are disposed on opposite sides of the adhesive layer body 11 facing each other. This structure makes the central axis of one of the first convex pillars 121 and one of the second convex pillars 122 arranged along the vertical direction of the adhesive layer body 11 to be the same, so that when the diaphragm 100 vibrates and emits sound, The vibration of the first base material layer 2 and the vibration of the second base material layer 3 are both synchronized with the vibration of the adhesive layer 1 , so that the diaphragm 100 has good acoustic performance when vibrating and producing sound.

In this embodiment, the holes 10 penetrate through the first base material layer 2 and the second base material layer 3 . The surface of the first protrusion 121 on the side away from the adhesive layer body 11 is flush with the surface of the first substrate layer body 21 on the side away from the adhesive layer body 11 . The surface of the second protrusion 122 on the side away from the adhesive layer body 11 is flush with the surface of the second substrate layer body 31 on the side away from the adhesive layer body 11 . This structure makes the surfaces of the opposite sides of the diaphragm 100 smooth, which is beneficial to improve the acoustic performance of the diaphragm 100 .

In this embodiment, the adhesive layer 1 is made of any one of acrylic, rubber and silica gel, and the first substrate layer 2 is polyethylene terephthalate (English: Polyethylene terephthalate). terephthalate, referred to as PET), polyether ether ketone (English: poly-ether-ether-ketone, referred to as PEEK), polyetherimide (English: Polyetherimide, referred to as PEI) any kind of material, so The second base material layer 3 is made of any one of polyethylene terephthalate PET, polyetheretherketone PEEK, and polyetherimide PEI.

In this embodiment, the diaphragm 100 is made by a liquefaction injection curing process, and the liquefaction injection curing process is to inject the liquefied adhesive layer 1 into the first base material layer 2 and the second base material Between the layers 3, the holes 10 of the first base material layer 2 and the holes 10 of the second base material layer 3 are filled and then cured. For example: the adhesive layer 1 is made of acrylic. During manufacture, the holes 10 are prefabricated in the first base material layer 2, and the holes 10 are prefabricated in the second base material layer 3. The first base material layer 2 and the second base material layer 3 are spaced apart and fixed in the mold plate, and then liquid acrylic acid is poured into the space between the first base material layer 2 and the second base material layer 3 , the liquid acrylic acid with good flowability fills the mold, and the cured acrylic acid forms the adhesive layer body 11 between the first base material layer 2 and the second base material layer 3; The first protrusions 121 are formed in the holes 10 of the first base material layer 2 ; the second protrusions 122 are formed in the holes 10 of the second base material layer 3 by the cured acrylic acid , and at the same time, the adhesive layer 1 , the first base material layer 2 and the second base material layer 3 form an integrated structure. This structure reduces the difference in material properties such as elastic modulus and damping of each layer of the diaphragm 100, thereby reducing the nonlinearity of the material along the thickness direction, improving the amplitude symmetry of the diaphragm 100, and reducing the distortion of the sound-emitting device.

Referring to FIG. 4 , the present invention further provides a sound-emitting device 200 . The sound-generating device 200 includes a vibration system 5 and a magnetic circuit system 6 that drives the vibration system 5 to vibrate and sound. The vibration system 5 includes the diaphragm 100 .

In this embodiment, the sound generating device 200 further includes a basin frame 4 , and the vibration system 5 and the magnetic circuit system 6 are respectively fixed to the basin frame 4 . The diaphragm 100 is fixed to the basin frame 4 . Because the difference in material properties such as elastic modulus and damping of each layer of the diaphragm 100 is reduced, the nonlinearity of the material along the thickness direction is reduced, the amplitude symmetry of the diaphragm 100 is improved, and the distortion of the sound-emitting device 200 can be reduced, thereby reducing the distortion of the sound-emitting device 200 . Therefore, the acoustic performance of the sound-emitting device 200 is good.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A vibrating film comprising an adhesive layer and a first base material layer and a second base material layer respectively pasted and fixed on opposite sides of the adhesive layer, characterized in that the first base material layer and/ Or a side of the second substrate layer close to the adhesive layer is recessed to form a hole in a direction away from the adhesive layer, and the adhesive layer includes an adhesive layer body and a protrusion from the adhesive layer body Extended convex posts; the first base material layer and the second base material layer are respectively attached to opposite sides of the adhesive layer body, and the convex posts are embedded in the holes, so that the adhesive The adhesive layer, the first base material layer and the second base material layer form an integrated structure.
The diaphragm according to claim 1, wherein the protruding pillars comprise a plurality of protruding pillars, and the plurality of protruding pillars are distributed in an array.
The vibrating membrane according to claim 2, wherein the holes are opened on the sides of the first base material layer and the second base material layer close to the adhesive layer, and the convex pillars comprise A first protruding post protruding from a side close to the first substrate layer and a second protruding post protruding from a side of the second substrate layer, each of the first protruding posts is associated with a corresponding One of the second protrusions is disposed on opposite sides of the adhesive layer body.
The diaphragm according to claim 3, wherein the holes penetrate through the first base material layer and/or the second base material layer.
The diaphragm according to claim 4, wherein the hole penetrates the first base material layer and the second base material layer, and the first convex post is away from the side of the adhesive layer body. The surface is flush with the surface of the first base material layer body on the side away from the adhesive layer body; the surface of the second protrusions on the side away from the adhesive layer body is flush with the second base material layer body The surface on the side away from the adhesive layer body is flush.
The vibrating membrane according to claim 4, wherein the vibrating membrane is made by liquefaction injection curing process.
The diaphragm according to claim 1, wherein the adhesive layer is made of any one of acrylic, rubber and silica gel, and the first substrate layer is polyethylene terephthalate The second base material layer is made of polyethylene terephthalate, polyetheretherketone, and polyetherimide. of any material.
A sound-generating device, comprising a vibration system and a magnetic circuit system for driving the vibration system to vibrate and sound, characterized in that the vibration system comprises the vibrating membrane according to any one of claims 1 to 7.