CN109218941B

CN109218941B - Sound generating device and electronic equipment

Info

Publication number: CN109218941B
Application number: CN201811204969.5A
Authority: CN
Inventors: 徐志刚; 郭翔; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-09-21
Filing date: 2018-10-16
Publication date: 2020-07-24
Anticipated expiration: 2038-10-16
Also published as: WO2020057011A1; CN109218941A

Abstract

The invention discloses a sound generating device and electronic equipment. 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 and an edge part, the central part is positioned in the center, the edge part is positioned on the periphery, the central part and the edge part are connected through a first cantilever, one end of the voice coil along the axial direction is fixed on the central part, the voice coil comprises a body part and a lead led out from the body part, and the centering support piece further comprises a fixing part, the fixing part is connected with the edge part and is spaced from the central part, or the fixing part is connected with the central part and is spaced; the orthographic projection of the fixing part is positioned between the edge part and the central part, the lead is fixed on the fixing part, and the part of the lead positioned between the fixing part and the root part is suspended.

Description

Sound generating device and electronic equipment

Technical Field

The present invention relates to the field of electroacoustic conversion technologies, and in particular, 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.

In a conventional speaker, a damper is generally provided to reduce polarization of a vibration system. The centering support piece and the voice coil body form fixed connection. The lead is led out from the body part and then welded with the bonding pad. The leads form a suspended portion between the pad and the body portion. In order to avoid that the pulling action of the wire during vibration has an adverse effect on the vibration of the vibration system, the suspended portion is usually of a longer length. However, the long length of the lead wire causes local vibration to be out of sync with the body portion, thereby causing noise to occur in the speaker.

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

Disclosure of Invention

One object of the present invention is to provide a new solution for a sound generating device.

According to a first aspect of the present invention, a sound emitting 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 and an edge part, the central part is positioned in the center, the edge part is positioned in the periphery, the central part and the edge part are connected through a first cantilever, 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 led out from the body part, and the centering support piece further comprises a fixing part, the fixing part is connected with the edge part and is separated from the central part, or the fixing part is connected with the central part and is separated from the edge part; the orthographic projection of the fixing part is located between the edge part and the central part, the lead is fixed on the fixing part, and the part of the lead located between the fixing part and the root is suspended.

Optionally, the fixing portion of the centering branch piece is made of the same material as the central portion, the edge portion and the first suspension arm and is integrally molded. .

Optionally, the centering disk is a single-layer structure made of one material layer; alternatively, the first and second electrodes may be,

the centering support piece is of a multi-layer structure formed by compounding a plurality of material layers or a multi-layer structure formed by compounding a plurality of material layers and glue layers, and the materials of the material layers are the same or different;

the material layer is made of high molecular polymer.

Optionally, each of the material layers is one of PI, PU, PEI, PEEK, PPS, PEN, TPR, and TPE.

Optionally, the centering branch piece comprises a first plastic material layer, a buffer layer covering the first plastic material layer and a second plastic material layer covering the buffer layer are further added on the fixing portion, and the buffer layer is a damping adhesive 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 main body includes two opposite leading edges, the leads are led out from the two leading edges respectively, the edge portion includes two first edges corresponding to the two leading edges, and the two fixing portions are located on the two first edges respectively.

Optionally, the voice coil, the edge portion and the central portion are rectangular, the fixing portion is located on a short side of the edge portion, and the leading edge is located on a short side of the voice coil.

Optionally, the two fixing portions are centrosymmetric around the geometric center of the centering branch piece.

Optionally, the fixing portion includes a first arm and a second arm connected to each other, the first arm is connected to the edge portion, the lead is fixed to the second arm, and the second arm is spaced apart from the edge portion.

Optionally, one end of the second arm, which is far away from the first arm, is connected to the edge portion through the third arm, and a hollow area is formed in an area surrounded by the first arm, the second arm, the third arm, and the edge portion.

Optionally, the lead includes a straight line segment parallel to the lead-out edge, the straight line segment of the lead is parallel to the second arm, and the first arm is an arc-shaped segment.

Optionally, one end of the leading edge and the corresponding first edge is counted as a first end, and the other end is counted as a second end; the lead is led out from the first end of the leading-out edge, and the fixing part is located at the second end of the corresponding first edge.

Optionally, the vibration isolator further comprises a shell, the shell is of a rectangular annular structure, the edge of a vibrating diaphragm of the vibration system is fixed to the shell in a surrounding mode, a bonding pad of the sound generating device is molded at the corner of the shell in an injection mode, the fixing portion is adjacent to the bonding pad in a setup mode, and the tail end of the lead is separated from the fixing portion and then welded to the bonding pad.

According to another aspect of the present disclosure, an electronic device is provided. The electronic equipment comprises the sound generating device.

According to one embodiment of the disclosure, the fixing part can fix and lift the lead wire, and the lead wire is prevented from making disordered movement during vibration, so that noise caused by overlong lead wire is reduced.

Further, an orthographic projection of the fixed portion is located between the edge portion and the central portion. The gap between the edge portion and the central portion provides a working space for the fixation of the lead, which makes the fixation of the lead easy.

Further, the fixing portion is spaced from the central portion so that the fixing portion does not interfere with the central portion during vibration.

Other features of the present invention 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 is an assembly view of a voice coil and a spider according to one embodiment of the present disclosure.

FIG. 3 is a schematic structural view of another centering disk according to one embodiment of the present disclosure.

Fig. 4 is an assembly view of another spider and voice coil according to one embodiment of the present disclosure.

Fig. 5 is a cross-sectional view of a fixation portion according to one embodiment of the present disclosure.

Description of reference numerals:

10: a centering support; 11: a first cantilever; 12: a fixed part; 13: leading out edges; 14: a free edge; 15: a central portion; 16: an edge portion; 17: a first arm; 18: a second arm; 19: a first end; 20: a second end; 21: vibrating diaphragm; 22: a voice coil; 23: a hollow-out area; 25: a housing; 26: a permanent magnet; 27: a lead wire; 28: a pad; 29: a reinforcing layer; 31: a first side; 32: a second edge; 33: a third arm; 34: a first layer of plastic material; 35: a second layer of plastic material; 36: a damping glue layer; 37: a thermoplastic elastomer layer.

Detailed Description

Various exemplary embodiments of the present invention 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 invention 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 invention, 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. The device comprises a vibration system and a magnetic circuit system matched with the vibration system. The sound generating device may be, but is not limited to, a speaker unit, an earphone, etc.

As shown in fig. 1, a magnetic circuit system is used to form a magnetic field. The magnetic circuit system includes a permanent magnet 26 and a yoke. The permanent magnet 26 is fixed to the yoke, 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.

As shown in fig. 1, the vibration system includes a voice coil 22, a damper 10, a diaphragm 21, and a reinforcing layer 29. 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. The central portion 15 and the edge portion 16 are connected by the first suspension 11. The first cantilever 11 can provide an elastic supporting force to prevent the polarization of the vibration system. 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 29 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 of the magnetic circuit system. For example by gluing. The glue used for bonding may be selected from materials commonly used in the art.

The first cantilever 11 may be configured in a linear type, an arc type, a wavy type, etc. The first suspension arm 11 may be parallel to the central portion 15 and the edge portion 16, or may be at a set angle to the corresponding edges of the two portions. In this example, the two first cantilevers 11 are centered symmetrically with respect to the geometric center of the centering disk 10. This way the elastic supporting force of the first cantilever 11 is more balanced, which can more effectively reduce the occurrence of polarization.

In this example, the voice coil 22, the edge portion 16, and the center portion 15 are rectangular. The rectangular structure is convenient for fixing the sound generating device in the electronic equipment, and when the sound generating device is installed, the relative position of the magnetic circuit system and the vibration system can more easily meet the set precision requirement.

As shown in fig. 1-4, the stiffener 10 also includes a securing portion 12. The fixing portion 12 is used to fix the lead 27. The securing portion 12 is connected to the edge portion 16 and spaced from the central portion 15, or the securing portion 12 is connected to the central portion 15 and spaced from the edge portion 16. The orthographic projection of the fixed portion 12 is located between the edge portion 16 and the central portion 15. Orthographic projection is the projection in the main plane of the centring disk 10. The portion of the lead 27 between the fixed portion 12 and the root portion is suspended. The root is the portion from which the lead 27 is drawn.

In the embodiment of the present disclosure, the fixing portion 12 can fix and lift the lead 27, and prevent the lead 27 from performing random movement during vibration, thereby reducing noise caused by an excessively long lead 27.

Further, the orthographic projection of the fixed portion 12 is located between the edge portion 16 and the central portion 15. The gap between the edge portion 16 and the central portion 15 provides a working space for the fixation of the lead 27, which makes the fixation of the lead 27 easy.

Further, the fixing portion 12 is spaced from the central portion 15, so that the fixing portion 12 does not interfere with the central portion 15 during vibration.

In one example, as shown in FIG. 2, the securing portion 12 is formed by an edge portion 16 extending inwardly. The fixing portion 12, the edge portion 16 and the central portion 15 are located in the same plane.

In another example, the fixation portion 12 extends inwardly from the rim portion 16, but the direction of extension is not in the main plane. For example, the fixing portion 12 protrudes upward or downward in the vibration direction from the main plane of the edge portion 16 and the center portion 15, but an orthogonal projection of the fixing portion 12 in the main plane is located between the edge portion 16 and the center portion 15.

The fixing portion 12 of the above-described embodiment can function to fix the lead 27. The setting can be carried out by the person skilled in the art according to the actual need.

In one example, the securing portion 12 is integrally formed with the rim portion 16. For example, the same membrane is integrally formed by punching.

In another example, the fixing portion 12 and the edge portion 16 are first molded separately. Then, the fixing portion 12 is fixedly connected to the edge portion 16 by heat fusion, adhesion, or the like.

The lead 27 is fixed to the fixing portion 12, for example, by glue. For example, the lead 27 is fixed by applying adhesive to all portions thereof passing through the fixing portion 12; or partially dispensing and fixing. But the beginning and end of the leads 27 need to be rubberized. Thus, the lead 27 does not move relative to the fixing portion 12. The fixing mode can effectively prevent the lead 27 from colliding with the centering branch piece 10, and the noise of the sound generating device is reduced.

In one example, the fixed portion 12 of the stiffener 10 is integrally molded of the same material as the central portion 15, the edge portion 16, and the first suspension arm 11. For example, the resin composition is integrally molded by injection molding or cast molding. The integrated processing mode enables the centering disk 10 to have higher structural strength and more balanced elasticity.

In one example, the stiffener 10 is a single layer structure made of one material layer.

Alternatively, the centering branch piece 10 has a multi-layer structure formed by combining a plurality of material layers or a multi-layer structure formed by combining a plurality of material layers and a glue layer, and the materials of the plurality of material layers are the same or different.

Wherein the material layer is made of high molecular polymer. The centering branch pieces 10 of the above structure have high structural strength. For example, each material layer is at least one of PI, PU, PEI, PEEK, PPS, PEN, TPR, and TPE. The material layer can be prepared from any one of the materials, or can be prepared by mixing multiple materials, or compounding multiple materials.

In one example, the stiffener 10 includes a first layer of plastic material 34. As shown in fig. 5, a buffer layer covering the first plastic material layer 34 and a second plastic material layer 35 covering the buffer layer are further added on the fixing portion 12.

The buffer layer is a damping glue layer 36;

alternatively, the cushion layer is a thermoplastic elastomer layer 37;

alternatively, the cushion layer is a composite structure of the damping rubber layer 36 and the thermoplastic elastomer layer 37.

For example, at least one of the first and second plastic material layers 34 and 34 is at least one of PI (polyimide), L CP (liquid crystal polymer), PPS (polyphenylene sulfide), PPO (polyphenylene oxide), and PTFE (polytetrafluoroethylene). the damping rubber layer 36 is at least one of acrylic rubber and silicone rubber, and the thermoplastic elastomer layer 37 is at least one of polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, dynamic vulcanized rubber, and thermoplastic blend thermoplastic elastomer, all of which have good high temperature resistance, thereby allowing the centralizer sheet 10 to operate under long-term, large-amplitude operating conditions.

In one example, the body portion includes two opposing lead-out edges 13. Two leads 27 are led out from the two lead-out sides 13, respectively. The two lead wires 27 serve as an outgoing line and an incoming line, respectively. The edge portion 16 includes two first sides 31 corresponding to the two lead-out sides 13. The two fixing portions 12 are located on the two first sides 31, respectively. The fixing portions 12 correspond one-to-one to the first sides 31. In this manner, the pulling action of the lead wires 27 on the body portion is more balanced and the occurrence of polarization can be significantly reduced, as compared to when the outgoing and incoming wires are led out from the same side of the body portion.

In one example, as shown in FIG. 2, the securing portion 12 is located on the short side of the rim portion 16. The lead-out edge 13 is located on the short side of the voice coil 22. For example, the first side 31 is a short side. The lead-out edge 13 is a short edge. The first edge 31 corresponds to the lead-out edge 13. The second side 32 is a long side. The free edge 14 of the voice coil 22 is the long edge. The free edge 14 is the edge from which no leads 27 are drawn. The second edge 32 corresponds to the free edge 14 of the voice coil 22. The first suspension arm 11 has one end connected to the second edge 32 and the other end connected to a corresponding edge of the central portion 15.

In this example, the fixing portion 12 is provided on the short side of the edge portion 16. The lead 27 is led out from the short side of the voice coil 22. The two first suspension arms 11 correspond to the long sides of the edge portion 16. In this way, the first suspension 11 can be made longer, providing a larger vibration margin for the vibration of the vibration system, and the first suspension 11 can provide an elastic supporting force in a larger amplitude range, preventing the occurrence of polarization.

In one example, the two fixing portions 12 are centrosymmetric about the geometric center of the centering leg 10. The centrosymmetric arrangement mode enables the structure of the vibration system to be more regular, the mass distribution to be more balanced, and the polarization to be reduced.

In one example, as shown in FIG. 2, the fixed portion 12 includes a first arm 17 and a second arm 18 connected to each other, the first arm 17 being connected to the edge portion 16, a lead 27 being fixed to the second arm 18, the second arm 18 being spaced from the edge portion 16, the first arm 17 having one end connected to the edge portion 16 and the other end connected to one end of the first arm 17, any one of the first arm 17 and the second arm 18 may be a straight arm, an arc arm, etc., in this example, the fixed portion 12 is generally in the form of an L, the second arm 18 is capable of resilient swinging about the first arm 17 to dissipate energy when the lead 27 vibrates, the swinging direction of the second arm 18 may be in any direction, which results in less noise from the vibration of the lead 27.

In one example, as shown in fig. 3, the fixing portion further includes a third arm 33. The end of the second arm 18 remote from the first arm 17 is connected to the rim portion 16 by a third arm 33. The area surrounded by the first arm 17, the second arm 18, the third arm 33, and the edge portion 16 forms the hollowed-out area 23. This arrangement restricts the displacement of the second arm 18 perpendicular to the vibration direction, so that the swinging direction of the fixing portion 12 at the time of vibration is perpendicular to the vibration direction, and the fixing portion 12 has higher strength and good reliability.

In one example, as shown in fig. 4, the lead 27 includes a straight line segment parallel to the lead-out edge 13. The straight section of the wire 27 is parallel to the second arm 18, and the first arm 17 is an arc-shaped section. In this example, the straight line segments of the lead 27 are routed in the extending direction of the second arm 18 and fixed on the second arm 18. The parallel arrangement of the leads 27 does not generate a component perpendicular to the vibration direction, as compared with the arrangement in which the leads 27 are arranged obliquely. In this way, the length of the lead 27 required to provide the same margin of vibration is minimized, and the lead 27 does not pull the body portion in a direction perpendicular to the direction of vibration.

Of course, the structure of the fixing portion 12 is not limited to the above-described embodiment, and those skilled in the art can arrange the fixing portion according to actual needs.

In one example, as shown in fig. 2, one end of the lead-out edge 13 and the corresponding first edge 31 is a first end 19, and the other end is a second end 20. The lead 27 is led out from the first end 19 of the lead-out side 13. The fixed portion 12 is located at the second end 20 of the corresponding first side 31. This arrangement maximizes the distance between the lead-out end of the lead wire 27 and the fixing portion 12. This allows the lead 27 to be made longer, providing a greater margin for vibration of the vibration system.

In one example, as shown in fig. 1 and 4, the housing 25 of the sound generator is a rectangular ring-shaped structure. The housing 25 is fixed to the vibration system. The edge of the diaphragm 21 of the vibration system is fixed around the housing 25. The vibration system is suspended in the middle of the housing 25. The pads 28 of the sound generating device are injection moulded at the corners of the housing 25. For example, the housing 25 is made of plastic, rubber, or silicone. The pad 28 is a metallic material. The pads 28 are embedded inside the corners of the case 25 by insert molding. The fixing portion 12 is disposed adjacent to the pad 28, and the two are juxtaposed and adjacent to each other. The end of the lead 27 is soldered to the pad 28 after being separated from the fixing portion 12. The fixing portion 12 is disposed adjacent to the pad 28.

In this example, the lead 27 is fixed to the fixing portion 12 before being bonded to the pad 28. Thus, the vibration of the wire 27 does not exert a pulling action on the pad 28, and the wire 27 is prevented from being separated from the pad 28 at a large amplitude.

In addition, the solder pads 28 do not occupy a space outside the housing 25, effectively reducing the volume of the sound generating device.

According to another embodiment of the present disclosure, an electronic apparatus 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 support piece and a voice coil, the centering support piece comprises a central portion and an edge portion, the central portion is located at the center, the edge portion is located at the periphery, the central portion is connected with the edge portion through a first cantilever, one end of the voice coil in the axial direction is fixed to the central portion, the voice coil comprises a body portion and a lead led out from the body portion, the centering support piece further comprises a fixing portion, the fixing portion is connected with the edge portion and is spaced from the central portion, the orthographic projection of the fixing portion is located between the edge portion and the central portion, the lead is fixed to the fixing portion, and the portion, located between the fixing portion and the root, of the lead is suspended.

2. The sound generating apparatus according to claim 1, wherein the fixing portion of the damper is integrally formed of the same material as the center portion, the edge portion, and the first suspension arm.

3. The sound generating apparatus according to claim 2, wherein the centering branch is a single-layer structure made of one material layer; alternatively, the first and second electrodes may be,

the centering support piece is of a multi-layer structure formed by compounding a plurality of material layers or a multi-layer structure formed by compounding a plurality of material layers and glue layers, and the material of the material layers is the same or different;

the material layer is made of high molecular polymer.

4. The sound emitting device of claim 3, wherein each of the material layers is at least one of PI, PU, PEI, PEEK, PPS, PEN, TPR, TPE.

5. The sound generating device according to claim 1, wherein the centering branch piece comprises a first plastic material layer, a buffer layer covering the first plastic material layer and a second plastic material layer covering the buffer layer are further added on the fixing portion, and 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.

6. The sound generating apparatus according to any one of claims 1 to 4, wherein the main body portion includes two opposite lead-out edges, the lead wires are led out from the two lead-out edges, respectively, the edge portion includes two first edges corresponding to the two lead-out edges, and the two fixing portions are located on the two first edges, respectively.

7. The sound generating apparatus according to claim 6, wherein the voice coil, the edge portion and the central portion have a rectangular shape, the fixing portion is located on a short side of the edge portion, and the lead-out side is located on a short side of the voice coil.

8. The sound generating apparatus according to claim 1, wherein the two fixing portions are centrosymmetric about a geometric center of the stiffener.

9. The sound generating apparatus as claimed in claim 1, wherein the fixing portion includes a first arm and a second arm connected to each other, the first arm being connected to the edge portion, the lead being fixed to the second arm, the second arm being spaced apart from the edge portion.

10. The sound generating apparatus according to claim 9, wherein the fixing portion further includes a third arm, an end of the second arm remote from the first arm is connected to the edge portion through the third arm, and a region surrounded by the first arm, the second arm, the third arm, and the edge portion forms a hollow area.

11. The sound generating apparatus according to claim 9, wherein the lead wire comprises a straight line segment parallel to the lead-out edge, the straight line segment of the lead wire being parallel to the second arm, the first arm being an arc-shaped segment.

12. The sound generating apparatus according to claim 6, wherein one end of the leading edge and the corresponding first edge is a first end, and the other end is a second end; the lead is led out from the first end of the leading-out edge, and the fixing part is located at the second end of the corresponding first edge.

13. The sound generating device according to claim 1, further comprising a casing, wherein the casing is a rectangular ring structure, an edge of a diaphragm of the vibration system is fixed on the casing in a surrounding manner, a bonding pad of the sound generating device is molded at a corner of the casing, the fixing portion is adjacent to the bonding pad, and an end of the lead is welded on the bonding pad after being separated from the fixing portion.

14. An electronic device comprising a sound emitting apparatus according to any one of claims 1-13.