CN109246561B

CN109246561B - Sound generating device and electronic equipment

Info

Publication number: CN109246561B
Application number: CN201811204970.8A
Authority: CN
Inventors: 郭翔; 徐志刚; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-09-21
Filing date: 2018-10-16
Publication date: 2020-01-14
Anticipated expiration: 2038-10-16
Also published as: CN109246561A; WO2020057010A1

Abstract

The invention discloses a sound generating device and electronic equipment. The device includes vibration system and the magnetic circuit who cooperates with vibration system, centering brace is including the central part that is located central authorities and the edge part that is located the periphery, be equipped with the supporting part between central part and the edge part, the voice coil loudspeaker voice coil includes this body portion and the lead wire of being drawn forth by this body portion, this body portion is including relative two edges of drawing forth and relative two free edges, centering brace includes two first edges that correspond with two edges of drawing forth, two second edges that correspond with two free edges, the supporting part is including being located two first cantilevers on the edge respectively and being located two second cantilevers on the edge respectively, the lead wire outwards draws forth and with first cantilever fixed connection along the extending direction of first cantilever, first cantilever is compared in the second cantilever and has been additionally equipped with the buffer layer.

Description

Sound generating device and electronic equipment

Technical Field

The present disclosure relates to the field of electroacoustic conversion technologies, and more particularly, to a sound generating device and an electronic device using the same.

Background

With the development of SMART-PA (SMART power amplifier system) of mobile phone, the speaker is required to be used under harsh conditions (such as large amplitude) and to ensure reliable performance. This requires a speaker having higher acoustic performance and capable of satisfying higher reliability. The lead of the voice coil is led out along the cantilever of the centering branch piece and is fixed, so that the centering branch piece has the centering function and the function of reducing the risk of wire breakage of the whole machine.

In the existing loudspeaker, a plurality of cantilevers of a centering support sheet are made of the same material. For example, a single layer Polyimide (PI) or a multi-layer Polyimide (PI) composite structure. However, the cantilever to which the lead is fixed is subjected to a larger load and impact due to the weight of the lead itself and a pulling force. This affects the centering action of the centering disk, resulting in polarization of the vibrating system.

Therefore, a new technical solution is needed to solve the above technical problems.

Disclosure of Invention

An object of the present disclosure is to provide a new technical solution of a sound generating device.

According to one aspect of the present disclosure, a sound generating device is provided. The device comprises a vibration system and a magnetic circuit system matched with the vibration system, wherein the vibration system comprises a centering support piece and a voice coil, the centering support piece comprises a central part positioned in the center and an edge part positioned on the periphery, a supporting part is arranged between the central part and the edge part, one end of the voice coil along the axial direction is fixed at the central part, the voice coil comprises a body part and a lead wire led out from the body part, the body part comprises two opposite leading-out edges and two opposite free edges, the lead wire is respectively led out from the two leading-out edges, the centering support piece comprises two first edges corresponding to the two leading-out edges and two second edges corresponding to the two free edges, the supporting part comprises first cantilevers respectively positioned on the two first edges and second cantilevers respectively positioned on the two second edges, and the lead wire is led out outwards along the extending direction of the first cantilevers and is fixedly connected with the first cantilevers, the first cantilever is added with a buffer layer compared with the second cantilever.

Optionally, the buffer layer is a damping glue layer; alternatively, the buffer layer is a thermoplastic elastomer layer; or the buffer layer is a composite structure of the damping glue layer and the thermoplastic elastomer layer.

Optionally, the buffer layer is a damping glue layer; or the buffer layer is a composite structure of the damping adhesive layer and the thermoplastic elastomer layer; the damping glue layer is at least one of acrylic glue and silica gel.

Optionally, the buffer layer is a thermoplastic elastomer layer or a composite structure of a damping adhesive layer and a thermoplastic elastomer layer; the material of the thermoplastic elastic layer comprises at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, dynamic vulcanized rubber and thermoplastic plastic blend type thermoplastic elastomer.

Optionally, the buffer layer is a surface structure located on the first cantilever.

Optionally, the first cantilever and the second cantilever comprise a first plastic substrate layer, and the first cantilever further comprises a buffer layer covering the first plastic substrate layer and a second plastic substrate layer covering the buffer layer.

Optionally, each of the first edges includes a first cantilever, and the two first cantilevers are disposed in central symmetry with respect to a geometric center of the centering branch.

Optionally, each of the first edges includes one of the first cantilevers, each of the second edges includes two of the second cantilevers, and the two of the second cantilevers on at least one of the second edges are symmetrical to each other with respect to a perpendicular bisector of the second edge.

Optionally, at least one of the first plastic substrate layer and the second plastic substrate layer is made of at least one of PI, PU, PEI, PEEK, PPS, and PEN.

According to another aspect of the present disclosure, an electronic device is provided. The device comprises a device shell and the sound generating device, wherein the sound generating device is arranged in the device shell.

According to an embodiment of the present disclosure, the sound generating device has the characteristic of good reliability.

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

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is an exploded view of a sound emitting device according to one embodiment of the present disclosure.

Fig. 2-3 are cross-sectional views of a first cantilever according to embodiments of the present disclosure.

FIG. 4 is an assembly view of a spider and coil according to one embodiment of the present disclosure.

FIG. 5 is an assembly view of another angle of the spider and coil according to one embodiment of the present disclosure.

Description of reference numerals:

10: a centering support; 11: a first cantilever; 12: a second cantilever; 13: leading out edges; 14: a free edge; 15: a central portion; 16: an edge portion; 17: a lead wire; 18 a: a first plastic substrate layer; 18 b: a second plastic substrate layer; 19: a thermoplastic elastomer layer; 20: a reinforcing layer; 21: vibrating diaphragm; 22: a voice coil; 23: a hollow-out area; 25: a housing; 26: a permanent magnet; 27: a magnetic yoke; 28: a pad; 29: the damping glue layer.

Detailed Description

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

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

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

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

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

According to one embodiment of the present disclosure, a sound generating device is provided. As shown in fig. 1, the device includes a vibration system and a magnetic circuit system cooperating with the vibration system. The sound generating device may be, but is not limited to, a speaker unit, an earphone, etc.

The magnetic circuit system is used for forming a magnetic field. The magnetic circuit system comprises a permanent magnet 26 and a magnetic yoke 27. The permanent magnet 26 is fixed to the yoke 27, for example, by glue. In this example, the permanent magnet 26 includes a center magnet and side magnets disposed around the center magnet. A magnetic gap is formed between the center magnet and the edge magnets. And magnetic conductive plates are respectively arranged on the central magnet and the edge magnets. Of course, the magnetic circuit system is not limited to the above-described embodiment, and other structures commonly used in the field may be provided. For example, the permanent magnet 26 is a ring magnet; the magnetic circuit system is an internal magnetic circuit structure or an external magnetic circuit structure and the like.

The vibration system includes a voice coil 22, a damper 10, a diaphragm 21, and a reinforcing layer 20. The centering buttresses 10 are made of an insulating material. The spider 10 includes a central portion 15 at the center and an edge portion 16 at the periphery. A support portion is provided between the central portion 15 and the edge portion 16.

The supporting part can provide elastic supporting force, so that the vibration system is prevented from polarization. One end of the voice coil 22 in the axial direction is fixed to the center portion 15. For example, the damper 10 is fixed to an end of the voice coil 22 close to the diaphragm 21 or an end far from the diaphragm 21. Voice coil 22 is inserted into the magnetic gap. The central portion 15 is fixedly connected to the middle of the diaphragm 21. A reinforcing layer 20 is also provided in the middle of the diaphragm 21. The rim portion 16 is fixed to the casing 25 of the sound generating device or the side wall of the yoke 27 of the magnetic circuit system. For example by gluing. The glue used for bonding may be selected from materials commonly used in the art.

In this example, as shown in fig. 1, the body portion of the voice coil includes two opposing lead-out edges 13 and two opposing free edges 14. The leads 17 are respectively led out from the two lead-out sides 13. The centring disk 10 comprises two first sides corresponding to the two lead-out sides 13 and two second sides corresponding to the two free sides 14.

As shown in fig. 4, the support portion includes first cantilevers 11 on two first sides, respectively, and second cantilevers 12 on two second sides, respectively. The lead 17 is led out along the extending direction of the first cantilever 11 and fixedly connected with the first cantilever 11. The first cantilever 11 is added with a buffer layer compared with the second cantilever 12.

The first and

second cantilevers

11 and 12 may be arranged in a linear type, an arc type, a wavy type, or the like. The extending direction refers to the general direction of the first cantilever 11. The first suspension arm 11 may be parallel to the corresponding sides of the central portion 15 and the edge portion 16, or may be at a set angle to the two corresponding sides.

Optionally, the buffer layer is a damping glue layer 29. The damping glue layer 29 has a good damping effect. For example, the damping rubber layer 29 is at least one of acrylic rubber and silicone rubber. The materials have good damping effect, and can effectively reduce the noise of the sound production device.

The cushion layer may be the thermoplastic elastomer layer 19. The thermoplastic elastomer layer 19 has good elasticity. For example, the material of the thermoplastic elastic layer 19 includes at least one of a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a dynamic vulcanized rubber, and a thermoplastic blend-type thermoplastic elastomer. The materials can improve the elasticity and rigidity of the first cantilever.

Alternatively, the cushion layer may be a composite structure of the damping rubber layer 29 and the thermoplastic elastomer layer 19. The damping gel layer 29 and the thermoplastic elastomer layer 19 are as previously described. The composite structure has good damping effect, elasticity and rigidity, so that the damping effect, the elasticity and the rigidity of the first cantilever can be effectively improved, the reliability of the centering support piece 10 is improved, and the noise of the sound generating device is reduced.

In the embodiment of the present disclosure, the buffer layer has good elasticity and damping effect, and can play a role of buffering, so that an interaction force between the lead 17 and the first cantilever 11 is effectively buffered when vibrating, and stress concentration is reduced. This makes the stress of lead wire 17 when vibrating along with first cantilever 11 disperse evenly, has reduced lead wire 17 broken string risk, has promoted the reliability allowance of sound generating mechanism.

In one example, the buffer layer is a surface structure located on the first cantilever 11. In general, fatigue damage is likely to occur in the surface layer structure. The buffer layer is used as the surface structure of the first cantilever 11 in this example, and this arrangement makes the damping performance and the elasticity of the first cantilever 11 more excellent than the arrangement of the buffer layer in the intermediate layer of the first cantilever 11.

In one example, as shown in fig. 2, the first and

second cantilevers

11 and 12 include a first plastic substrate layer 18 a. The first suspension arm 11 further includes a buffer layer covered on the first plastic substrate layer 18a and a second plastic substrate layer 18b covered on the buffer layer.

Optionally, at least one of the first plastic substrate layer 18a and the second plastic substrate layer 18b is made of at least one of PI, PU, PEI, PEEK, PPS, and PEN. The cushion layer is a thermoplastic elastomer layer 19. The materials all have good high temperature resistance, so that the centering branch piece 10 keeps good elastic supporting force under the working condition of long time and large amplitude.

The structure shown in fig. 3 includes a first plastic substrate layer 18a and a second plastic substrate layer 18b as skin layers and a cushion layer therebetween. The cushion layer comprises two layers of damping glue 29 and a layer 19 of thermoplastic elastomer between the two layers of damping glue 29. The first cantilever also has good damping performance, elasticity and rigidity.

In one example, as shown in fig. 4-5, each first side includes a first cantilever 11. The two first cantilevers 11 are arranged in a centrosymmetric manner with respect to the geometric center of the centering disk 10. The centrosymmetric mode makes the pulling action of the lead 17 on the centering branch piece 10 more uniform, and compared with the way of leading the outgoing line and the incoming line from the same position or from the same side, the amplitude of the vibration system is more uniform, and therefore polarization is more effectively inhibited.

In one example, each first side includes a first cantilever 11. Each second side comprises two second suspension arms 12. The two second suspension arms 12 on at least one second side are symmetrical to each other with respect to the perpendicular bisector of the second side. The plurality of second cantilevers 12 can provide multi-point support. And because the two second cantilevers 12 are symmetrical to each other, torsion, offset and the like of the damper 10 during vibration can be effectively suppressed, and the damper 10 is ensured to vibrate back and forth along the vibration direction, so that the polarization of the vibration system is effectively suppressed.

Of course, the number of the second suspension arms 12 may also be 4, 6, 8, etc. and are symmetrical to each other with respect to the perpendicular bisector of the second side, which is not limited by the present disclosure.

In one example, the headpiece 10 is integrally formed. For example, the central portion 15, the edge portion 16, the first suspension arm 11, and the second suspension arm 12 are formed by cutting, punching, or the like from the same composite material film layer. A stripping process is performed between the central portion 15, the edge portion 16, the first suspension arm 11, and the second suspension arm 12 to form a hollowed-out area 23. Note that, at the portion where the second cantilever 12 is formed, a buffer layer is not provided.

Or, the plastic base material layer and the buffer layer are prepared into a set shape according to actual needs, and then the plastic base material layer and the buffer layer are compounded together.

In other examples, the material of the first arm 11, the second arm 12, the central portion 15, and the edge portion 16 of the damper 10 is different. In manufacturing, the first suspension arm 11, the second suspension arm 12, the central portion 15, and the edge portion 16 are manufactured separately, and then the four portions are bonded together to form the damper 10.

Of course, the fabrication of the centering branch 10 is not limited to the above-mentioned embodiments, and those skilled in the art can select the embodiment according to actual needs.

In one example, as shown in FIG. 1, the sound generator further includes a ring-shaped housing 25. For example, the housing 25 has a rectangular ring shape. The housing 25 is fixed to a permanent magnet 26 of the magnetic circuit system. The pads 28 of the sound generating device are injection moulded at the corners of the housing 25. For example, two pads 28 are respectively injection-molded at two opposite corners of the housing 25 by insert molding.

As shown in fig. 5, the end of the lead 17 is soldered to the pad 28 after being separated from the first cantilever 11. The lead 17 is electrically connected to an external device through a pad 28. The pads 28 include inner and outer connection portions. The lead wire 17 is soldered to the inner connection portion. The external connection portion is connected with an external device in a contact manner. This makes conduction of the speaker unit with the external device easier than directly soldering the lead wire 17 to the external device.

Further, the pads 28 are provided at the corners for easy handling, which makes connection with an external device easy.

According to another embodiment of the present disclosure, an electronic device is provided. The electronic device may be, but is not limited to, a sound module, a mobile phone, a tablet computer, a wearable device, an intercom, a game console, a radio, a television, a smart speaker, etc. This electronic equipment includes casing and the sound generating mechanism of this disclosed embodiment. The sound emitting device is disposed in the housing.

The electronic equipment has the characteristics of good sound production effect and good reliability.

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

Claims

1. A sound generating device comprises a vibration system and a magnetic circuit system matched with the vibration system, wherein the vibration system comprises a centering disk and a voice coil, the centering disk comprises a central part positioned in the center and an edge part positioned on the periphery, a supporting part is arranged between the central part and the edge part, one end of the voice coil along the axial direction is fixed at the central part,

the voice coil comprises a body part and a lead wire led out from the body part, the body part comprises two opposite leading-out edges and two opposite free edges, the lead wire is respectively led out from the two leading-out edges, the centering support sheet comprises two first edges corresponding to the two leading-out edges and two second edges corresponding to the two free edges,

the lead is characterized in that the supporting part comprises first cantilevers respectively located on two first edges and second cantilevers respectively located on two second edges, the lead is led out outwards along the extending direction of the first cantilevers and fixedly connected with the first cantilevers, and buffer layers are additionally arranged on the first cantilevers and are compared with the second cantilevers.

2. The sound generating apparatus according to claim 1, wherein the buffer layer is a damping glue layer;

alternatively, the buffer layer is a thermoplastic elastomer layer;

or the buffer layer is a composite structure of the damping glue layer and the thermoplastic elastomer layer.

3. The sound generating apparatus according to claim 2, wherein the buffer layer is a damping glue layer;

or the buffer layer is a composite structure of the damping adhesive layer and the thermoplastic elastomer layer;

the damping glue layer is at least one of acrylic glue and silica gel.

4. The sound generating apparatus according to claim 1, wherein the buffer layer is a thermoplastic elastomer layer;

the material of the thermoplastic elastic layer comprises at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, dynamic vulcanized rubber and thermoplastic plastic blend type thermoplastic elastomer.

5. The sound generating apparatus according to claim 1, wherein the buffer layer is a skin structure located at the first cantilever.

6. The sound generating apparatus according to claim 1, wherein the first and second cantilevers comprise a first plastic substrate layer, the first cantilever further comprising a buffer layer covering on the first plastic substrate layer and a second plastic substrate layer covering on the buffer layer.

7. The sound generating apparatus according to claim 1, wherein each of the first sides comprises a first cantilever, and the two first cantilevers are arranged in a central symmetry with respect to a geometric center of the centering branch.

8. The apparatus according to claim 1, wherein each of said first sides comprises one of said first cantilevers, each of said second sides comprises two of said second cantilevers, and the two of said second cantilevers on at least one of said second sides are symmetrical to each other with respect to a perpendicular bisector of the second side.

9. The sound generating apparatus according to claim 6, wherein the first plastic substrate layer or the second plastic substrate layer is made of at least one of PI, PU, PEI, PEEK, PPS, and PEN.

10. An electronic device comprising a device housing and a sound generating device according to any one of claims 1-9, the sound generating device being disposed in the device housing.