WO2022000776A1

WO2022000776A1 - Diaphragm and sound-producing device

Info

Publication number: WO2022000776A1
Application number: PCT/CN2020/114314
Authority: WO
Inventors: 章超; 曾月
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-06-30
Filing date: 2020-09-10
Publication date: 2022-01-06
Also published as: CN212812006U

Abstract

The present utility model discloses a diaphragm, comprising a first soft adhesive layer, and a first hard film layer and a second hard film layer which are respectively attached to two opposite sides of the first soft adhesive layer; the thickness of the first hard film layer is different from the thickness of the second hard film layer, and the hardness of the first hard film layer and the hardness of the second hard film layer are greater than the hardness of the first soft adhesive layer. Compared with the related art, the diaphragm and the sound-producing device of the present utility model have good acoustic performance and reliability.

Description

Diaphragm and sound device

technical field

The utility model 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 of the related art includes a vibration system and a magnetic circuit system with a magnetic gap; the vibration system includes a diaphragm and a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound. The vibrating membrane adopts a composite layer structure, including a hard film layer and a soft adhesive glue layer alternately stacked in sequence to form a three-layer or five-layer structure, wherein the thickness of each hard film layer is the same.

technical problem

However, with the increase in the amplitude requirement of the sound-emitting device, the diaphragm in the related art has the same thickness of each hard film layer, which leads to an increased risk of diaphragm rupture and failure under large amplitude, which in turn leads to product failure. The problem stands out.

Therefore, it is necessary to provide a new vibrating film and a sounding device to solve the above technical problems.

technical solutions

The purpose of this utility model is to overcome the above-mentioned technical problems, and to provide a vibrating film and a sound-emitting device with good acoustic performance and high reliability.

In order to achieve the above purpose, the present invention provides a vibrating membrane, the vibrating membrane comprises a first soft adhesive adhesive layer and first hard adhesive layers respectively attached to opposite sides of the first soft adhesive adhesive layer film layer and second hard film layer; the thickness of the first hard film layer is different from the thickness of the second hard film layer; wherein, the first hard film layer and the second hard film layer The hardness of the plasma membrane layer is greater than the hardness of the first soft adhesive layer.

Preferably, the ratio of the thickness of the first hard film layer to the thickness of the second hard film layer ranges from 0.1 to 0.9.

Preferably, the diaphragm further comprises a second soft adhesive layer attached to the side of the second hard film layer away from the first soft adhesive layer, and a second soft adhesive layer attached to the second hard layer. a third hard film layer on the side of the soft adhesive layer away from the second hard film layer; the first hard film layer, the second hard film layer and the third hard film layer The thicknesses of the layers are different; wherein, the hardness of the first hard film layer, the second hard film layer and the third hard film layer are all greater than the hardness of the first soft adhesive layer and the hardness of the third hard film layer. Second, the hardness of the soft adhesive layer.

Preferably, among the first hard film layer, the second hard film layer and the third hard film layer, the thickness ratio of the layer with the smallest thickness to the layer with the largest thickness is in the range of 0.1-0.9 .

Preferably, the first soft adhesive layer and the second soft adhesive layer have the same thickness.

Preferably, the thicknesses of the first soft adhesive layer and the second soft adhesive layer are different, and the thickness ratio of a layer with a larger thickness to a layer with a smaller thickness ranges from 0.1 to 0.9.

Preferably, the first hard film layer, the second hard film layer and the third hard film layer are all thermoplastic elastomers, polyetheretherketone, polyarylate, polyetherimide, It is made of any one of thermoplastic polyurethane elastomer, rubber and TPV.

Preferably, in the first hard film layer, the second hard film layer and the third hard film layer, the thickness of each layer is 2-1000um, and the modulus of each layer is 1-5000MPa .

Preferably, the first soft adhesive layer and the second soft adhesive layer are made of acrylic film or silicone film, and the thickness of each layer is 2-100um.

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 above-mentioned vibrating membrane provided by the present invention.

beneficial effect

Compared with the prior art, in the vibrating membrane of the present invention and the sound-generating device using the vibrating membrane, the vibrating membrane comprises at least two hard film layers and a soft soft film for bonding the adjacent two hard film layers. The adhesive layer, by setting the thickness of each hard film layer to be different, makes the stress on the diaphragm redistributed and averaged, thereby effectively reducing the stress level of the diaphragm, thereby effectively reducing the rupture of the diaphragm The probability of the diaphragm is reduced, the problem of product failure is reduced, and the reliability of the diaphragm and the sound-emitting device using the diaphragm is higher; due to the improvement of the stress level of the diaphragm, the diaphragm can achieve a larger amplitude, which effectively improves the performance of the diaphragm. The acoustic performance of the diaphragm and the sound-emitting device using the diaphragm.

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 drawings in the following description are only some implementations of the present invention. For example, 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 membrane of the present invention;

FIG. 2 is a schematic diagram of a part of the structure in FIG. 1 .

3 is a schematic structural diagram of another embodiment of FIG. 2;

FIG. 4 is a schematic structural diagram of the sound-emitting device of the present invention.

Embodiments of the present invention

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The present invention provides a vibrating film 10, the vibrating film 10 comprises at least two hard film layers and a soft adhesive layer for bonding two adjacent hard film layers, and each hard film layer has a The thickness is different, thereby reducing the stress level of the diaphragm, thereby reducing the rupture rate. The following takes the three-layer structure and five-layer structure as examples to illustrate, not limited to three or five layers, but also other layers, such as seven layers, nine layers, etc.:

Embodiment one

Please also refer to FIGS. 1-2 , the diaphragm 10 includes a first soft adhesive layer 11 and a first hard film attached to opposite sides of the first soft adhesive layer 11 respectively layer 21 and the second hard film layer 22, thus forming a diaphragm with a three-layer structure. Wherein, the thickness of the first hard film layer 21 is different from the thickness of the second hard film layer 22 . For example, from top to bottom are the first hard film layer 21 , the first soft adhesive layer 11 , and the second hard film layer 22 . Wherein, the thickness of the second hard film layer 22 is greater than the thickness of the first hard film layer 21 .

In this embodiment, the ratio of the thickness of the first hard coat layer 21 to the thickness of the second hard coat layer 22 is preferably in the range of 0.1-0.9. That is, the thickness difference between the first hard coat layer 21 and the second hard coat layer 22 is greater than the standard deviation of the thickness of the second hard coat layer 22 . The structural design effectively reduces the stress level of the diaphragm 10, thereby reducing the probability of film rupture of the diaphragm 10, so as to reduce the problem of product distortion and improve its reliability; Better acoustic performance.

Wherein, the hardness of the first hard film layer 21 and the second hard film layer 22 is greater than the hardness of the first soft adhesive layer 11 .

In this embodiment, the first hard film layer 21 and the second hard film layer 22 are thermoplastic elastomer (TPE), polyether ether ketone (PEEK), polyarylate (PAR), polyether It is made of any one of imide (PEI), thermoplastic polyurethane elastomer (TPU), rubber, and TPV. Of course, the above-mentioned materials are conventional materials for making hard film layers in the prior art.

In the present invention, in the first hard film layer 21 and the second hard film layer 22, the thickness of each layer is 2-1000um, and the modulus of each layer is 1-5000MPa.

The first soft adhesive layer 11 is made of an acrylic film or a silicone film, and the thickness thereof is both 2-100um. Of course, the above-mentioned materials are conventional materials for making soft adhesive layers in the prior art.

Embodiment 2

Please refer to FIG. 3 together to provide another embodiment of the diaphragm structure with different layers. The difference between this embodiment and the embodiment shown in FIG. 2 is that the layer of hard film layer and the soft The number of adhesive layers varies, as follows:

In this embodiment, the diaphragm 10 has a five-layer structure, including a first soft adhesive layer 211 and a first hard film respectively attached to opposite sides of the first soft adhesive layer 211 layer 221, the second hard film layer 222, the second soft adhesive layer 212 attached to the side of the second hard film layer 222 away from the first soft adhesive layer 211, and the The third hard film layer 223 on the side of the second soft adhesive layer 212 away from the second hard film layer 222 forms a five-layer structure diaphragm.

The thicknesses of the first hard film layer 221 , the second hard film layer 222 and the third hard film layer 223 are different. In this embodiment, among the first hard coat layer 221 , the second hard coat layer 222 and the third hard coat layer 223 , the thickness of the layer with the smallest thickness and the thickness of the layer with the smallest thickness are preferably The ratio range is 0.1-0.9.

For example, from top to bottom are the first hard film layer 221 , the first soft adhesive layer 211 , the second hard film layer 222 , the second soft adhesive layer 212 , and the third hard film layer 223 . The thickness of the second hard coat layer 222 is greater than that of the third hard coat layer 223 , and the thickness of the third hard coat layer 223 is greater than that of the first hard coat layer 221 . At this time, the thickness ratio of the first hard film layer 221 to the second hard film layer 222 ranges from 0.1 to 0.9. That is, the thickness difference between the first hard coat layer 221 and the second hard coat layer 222 is greater than the standard deviation of the second hard coat layer 222 . The five-layer structure diaphragm design effectively reduces the stress level of the diaphragm 10 , thereby reducing the probability of film rupture of the diaphragm 10 , thereby reducing the problem of product distortion and improving its reliability; at the same time, it can further improve the vibration of the diaphragm 10 . amplitude for better acoustic performance.

Wherein, the hardness of the first hard film layer 221 , the second hard film layer 222 and the third hard film layer 223 are all greater than the hardness of the first soft adhesive layer 211 and the hardness of the second hard film layer 223 . hardness of the quality adhesive layer 212 .

In this embodiment, the thicknesses of the first soft adhesive layer 211 and the second soft adhesive layer 212 are the same, or may be the same.

In order to further reduce the stress level of the diaphragm 10, preferably the thickness of the first soft adhesive layer 211 and the second soft adhesive layer 212 are different, and the thickness of the layer with a larger thickness and the thickness of the layer with a smaller thickness are preferably different. The thickness ratio ranges from 0.1 to 0.9. For example, in this embodiment, the thickness of the second soft adhesive layer 212 is greater than the thickness of the first soft adhesive layer 211 .

Of course, the stacking order of the first hard film layer 221, the second hard film layer 222, and the third hard film layer 223 is not limited to the above examples, and can be arranged freely; the first soft adhesive layer 211 and the The stacking order of the second soft adhesive layers 212 is not limited to the above examples, and can be interchanged.

In this embodiment, the first hard film layer 221 , the second hard film layer 222 and the third hard film layer 223 are thermoplastic elastomer (TPE), polyether ether ketone (PEEK) , polyarylate (PAR), polyetherimide (PEI), thermoplastic polyurethane elastomer (TPU), rubber, TPV made of any material, of course, the above materials are made of hard film layers in the prior art conventional materials.

In the first hard film layer 221, the second hard film layer 222 and the third hard film layer 223, the thickness of each layer is 2-1000um, and the modulus of each layer is 1-5000MPa .

The first soft adhesive layer 211 and the second soft adhesive layer 212 are both made of acrylic film or silicone film, and the thickness of each layer is 2-100um. Of course, the above materials are Conventional materials for making soft adhesive layers in the prior art.

As shown in FIG. 4 , the present invention also provides a sound-generating device 100, comprising a basin frame 1, a vibration system 2 respectively fixed on opposite sides of the basin frame 1, and a magnetic circuit system 3 for driving the vibration system 2 to vibrate and sound, The vibration system 2 includes the above-mentioned vibration film 10 provided by the present invention.

The above are only the embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and accompanying drawings of the present invention, or directly or indirectly applied to other Relevant technical fields are similarly included in the scope of patent protection of the present invention.

Claims

A vibrating film, characterized in that the vibrating film comprises a first soft adhesive layer, a first hard film layer and a second hard film layer respectively attached to opposite sides of the first soft adhesive layer Hard film layer; the thickness of the first hard film layer and the thickness of the second hard film layer are different; wherein, the hardness of the first hard film layer and the second hard film layer greater than the hardness of the first soft adhesive layer.
The diaphragm according to claim 1, wherein the ratio of the thickness of the first hard film layer to the thickness of the second hard film layer ranges from 0.1 to 0.9.
The vibrating film according to claim 1, wherein the vibrating film further comprises a second soft adhesive layer attached to the side of the second hard film layer away from the first soft adhesive layer. an adhesive layer and a third hard film layer attached to the side of the second soft adhesive layer away from the second hard film layer; the first hard film layer, the second hard film layer The thicknesses of the plasma film layer and the third hard film layer are different; wherein, the hardness of the first hard film layer, the second hard film layer and the third hard film layer are all greater than that of the first hard film layer. The hardness of the first soft adhesive layer and the hardness of the second soft adhesive layer.
The diaphragm according to claim 3, wherein among the first hard film layer, the second hard film layer and the third hard film layer, the layer with the smallest thickness and the layer with the largest thickness The thickness ratio of one layer ranges from 0.1 to 0.9.
The diaphragm according to claim 3, wherein the thickness of the first soft adhesive layer and the thickness of the second soft adhesive layer is the same.
The diaphragm according to claim 3, wherein the thickness of the first soft adhesive layer and the second soft adhesive layer are different, and a layer with a larger thickness and a smaller thickness The thickness ratio of one layer ranges from 0.1 to 0.9.
The diaphragm according to claim 3, wherein the first hard film layer, the second hard film layer and the third hard film layer are thermoplastic elastomer, polyetheretherketone , Polyarylate, polyetherimide, thermoplastic polyurethane elastomer, rubber, TPV in any material.
The diaphragm according to claim 7, wherein the thickness of each layer of the first hard film layer, the second hard film layer and the third hard film layer is 2~2 1000um, the modulus of each layer is 1-5000MPa.
The diaphragm according to claim 3, wherein the first soft adhesive layer and the second soft adhesive layer are made of acrylic film or silicone film, and each layer of the The thickness is 2~100um.
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 1-9.