WO2019205712A1

WO2019205712A1 - Sound emission device

Info

Publication number: WO2019205712A1
Application number: PCT/CN2018/125469
Authority: WO
Inventors: 张�成; 李柯; 赵国栋; 刘春发
Original assignee: 歌尔股份有限公司
Priority date: 2018-04-27
Filing date: 2018-12-29
Publication date: 2019-10-31

Abstract

Disclosed is a sound emission device, comprising: a vibration diaphragm; a voice coil; and a spider. The voice coil is formed by winding two voice coil wires and has four wire ends extending therefrom. The vibration diaphragm is connected to one side of the voice coil. The spider has electrically-conductive lines for establishing a connection between the voice coil and an external circuit. The spider comprises two fixed portions and two suspended portions. The suspended portions are connected to one side of voice coil opposite to the vibration diaphragm. The two suspended portions are symmetrically arranged with respect to the center of the voice coil. Two electrical contacts are formed at each suspended portion. The four wire ends are respectively connected to the four electrical contacts in a one-to-one relationship. The two ends of each of the two suspended portions are connected to the fixed portions. The fixed portion comprises an electrically-conductive connection material and two end-fixing regions. The electrically-conductive connection material is connected between the two end-fixing regions. The two suspended portions are electrically connected by means of the fixed portions.

Description

Sound device

Technical field

The invention belongs to the technical field of electroacoustic transduction, and in particular to a sounding device.

Background technique

A sounding device is an important acoustic component in an electronic device that is a transducer that converts an electrical signal into an acoustic signal. Existing sounding devices include a housing, and a magnetic circuit system and a vibration assembly disposed within the housing.

Among them, dynamic coil sounding devices are widely used in consumer electronic products, and their working methods can meet the needs of speakers and earpieces of electronic products. However, due to the structural characteristics of the moving coil sounding device itself, the polarization problem of the voice coil and the diaphragm and the connection problem of the voice coil lead have been very difficult technical problems. On the other hand, in the conventional conventional moving coil type sounding device, in order to realize the conduction of an electric signal, it is often required to use an injection molded elastic piece in the casing of the device. This structural design leads to an increase in the number of components of the sounding device, an increase in the cost of processing and production, and an increase in the complexity of the assembly process. On the other hand, since it is necessary to inject the elastic piece in the casing, the thickness of the partial portion of the casing necessarily needs to be appropriately increased, so that a good wrapping effect on the elastic piece can be achieved. Therefore, in the case where the overall height of the sounding device is limited, if an injection molded elastic piece is required, the height of the side magnet or other components needs to be lowered. This design will affect the acoustic performance of the sounding device to a certain extent, which is not conducive to improving the acoustic performance of the sounding device.

It can be seen that the existing conventional moving coil sounding device has gradually failed to meet higher and higher performance requirements, and it is necessary to improve the structure of the sounding device.

Summary of the invention

It is an object of the invention to provide a new technical solution for a sounding device.

According to a first aspect of the present invention, a sound emitting device is provided, comprising:

a diaphragm and a voice coil, the voice coil is formed by winding two voice coils and has four lead ends, and the diaphragm is connected to one side of the voice coil;

a centering piece having a conductive line connecting the voice coil and an external circuit, the centering piece comprising two fixing portions and two floating portions, the floating portion being connected to the voice coil On the other side opposite to the diaphragm, the two floating portions are distributed in a central symmetry with respect to the center of the voice coil, and two electrical connection points are formed on each of the floating portions, and the four leads are formed. One-to-one correspondence is connected to the four electrical connection points;

Two ends of the two floating portions are respectively connected to the two fixing portions, the fixing portion includes a conductive material and two end fixing regions, and the conductive material is connected between the two end fixing regions An electrical connection is formed between the two floating portions by the fixing portion.

Optionally, the floating portion is coupled to the end fixing region.

Optionally, an elastic portion is connected between the end fixing region and the floating portion.

Optionally, the elastic portion is a strip structure extending in an S-shape;

Or the elastic portion is a sheet-like arc-shaped convex structure extending from the fixing portion to the floating portion, and the convex convex direction of the curved convex structure faces the diaphragm or is away from the diaphragm;

Alternatively, the elastic portion is a sheet-like wavy structure extending from the fixing portion to the floating portion.

Optionally, one pad is formed on each of the fixing portions, and the pad is located on the end fixing region.

Optionally, one of the pads is electrically connected to two electrical connection points on the two floating portions, and the other of the pads is electrically connected to the other two electrical connection points on the two floating portions.

Optionally, two electrical connection points that are symmetrically distributed centrally with respect to the center of the voice coil are electrically connected to the same one of the pads.

Optionally, a magnetic circuit system is further formed, wherein a magnetic gap is formed in the magnetic circuit system, the voice coil is located in the magnetic gap, and the magnetic circuit system is formed with a receiving groove, and the conductive material is embedded in In the receiving groove.

Optionally, the magnetic circuit system includes a side magnet and a center magnet, and the magnetic gap is formed between the side magnet and the center magnet;

The accommodating groove is formed at a position on the side magnet away from the side of the magnetic gap.

Optionally, further comprising a housing configured to carry the diaphragm and a centering piece, the voice coil being located in the housing, the housing being formed with a receiving groove, The conductive binder is embedded in the receiving groove.

Optionally, a surface of the sounding device for carrying the end fixing region is flush with the receiving groove, and the conductive material of the fixing portion and the two end fixing regions are in a plane.

Optionally, the voice coil has a rectangular structure, and the two floating portions are respectively attached to the two short sides of the voice coil.

Optionally, the centering piece is an integrally arranged FPCB board.

According to one embodiment of the present disclosure, components are reduced relative to existing sounding devices, simplifying the structure of the sounding device.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a schematic exploded view showing the structure of a part of the sounding device provided by the present invention;

2 is a schematic top plan view of a centering piece provided by the present invention;

3 is a schematic top plan view of a voice coil provided by the present invention;

4 is a schematic top plan view of the centering support piece and the voice coil provided by the present invention;

FIG. 5 is a schematic exploded view showing a structure of a part of a sound emitting device according to another embodiment of the present invention; FIG.

Figure 6 is a side cross-sectional view of the sound emitting device provided by the present invention;

Fig. 7 is a side cross-sectional view showing a sound emitting device according to another embodiment of the present invention.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

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

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The present invention provides an improved sounding device comprising a diaphragm 1, a voice coil 2 and a centering support 3, as shown in FIG. The centering piece 3 has a conductive line for electrically connecting the voice coil 2 to an external circuit such as a mobile phone. As shown in FIG. 2, the centering piece 3 includes two floating portions 31 and two fixing portions 32, and the diaphragm 1 is attached to one side surface of the voice coil 2, the centering piece The floating portion 31 of 3 is connected to the other side surface of the voice coil 2, and the floating portion 31 and the diaphragm 1 sandwich the voice coil 2. The fixing portion 32 is fixedly disposed in the sounding device. When the sounding device is in operation, the diaphragm 1 and the voice coil 2 generate vibration. At this time, the floating portion 31 can vibrate together with the diaphragm 2 and the diaphragm 1, and the fixing portion 32 is fixed in the sounding device without vibrating. The centering piece 3 is configured to enable a certain amount of relative displacement between the floating portion 31 and the fixed portion 32.

The two floating portions 31 are distributed in a center symmetry with respect to the center of the voice coil 2. Thus, the two floating portions 31 can support the voice coil 2 from two positions symmetrical with respect to the voice coil 2, and restrict the vibration direction and the amplitude action. With this design, the possibility of polarization occurring when the voice coil 2 is operated can be effectively reduced. FIG. 4 specifically shows a structural form of the voice coil 2 and the centering support 3, and it can be seen that the two floating portions 31 are symmetrically distributed with respect to the center of the voice coil 2.

Further, the voice coil is formed by winding two voice coils, and four lead ends 21 are drawn on the voice coil. Four of the lead terminals 21 are used to connect to the signal circuit to connect the voice coil to the complete sound signal loop. Figure 3 shows the top view of the voice coil 2, showing that the four lead ends 21 are drawn from the voice coil 2. The four lead ends 21 may be the incoming end 211 and the outgoing end 212 of the two voice coil lines, respectively. Two electrical connection points 311 are formed on each of the floating portions 31, and in the entire sounding device, there are four electrical connection points 311 provided by the floating portions 31 of the centering pieces 3. The four lead terminals 21 on the voice coil 2 are respectively connected to the four electrical connection points 311 in a one-to-one correspondence, as shown in FIG. In this embodiment of the design of the present invention, the lead end 21 of the voice coil 2 does not need to be connected to a pad or electrical connection point on the housing of the sounding device over a relatively long suspension extension. As shown in FIG. 4, the length of the lead terminal 21 is relatively short, which can be directly connected to the electrical connection point 311 on the floating portion 31. When the voice coil 2 vibrates, the electrical connection points 311 carried by the floating portion 31 also vibrate together. Thus, the lead end 21 is completely unaffected by the vibration and does not exert a pulling force on the voice coil. The risk of wire breakage is greatly reduced compared to conventional moving coil sounding devices.

Further, two ends of the two floating portions 31 are fixedly connected to the two fixing portions 32, respectively. As shown in FIG. 2, in this embodiment, the upper ends of the two floating portions 31 are connected to the upper one of the fixing portions 32; correspondingly, the lower ends of the two floating portions 31 and the lower one of the fixing portions 32 are provided. connection. The centering piece 3 has an annular structure as a whole. Each of the fixing portions 32 includes a conductive web 322 and two end fixing regions 323 as shown in FIG. The conductive material 322 is connected between the two end fixing regions 323, and the conductive material 322 functions as an electrical conduction. It is capable of communicating a signal to the end fixing regions 323 at both ends or to the two floating portions 31 connected to the fixing portion 32. The two floating portions 31 are electrically connected by the fixing portion 32.

In the technical solution of the present invention, the centering support piece 3 electrically connects the two floating parts 31 by using the conductive material 322, which satisfies the circuit arrangement requirements in the sounding device. In this way, there is no need to set up the injection spring shrapnel in the sounding device. On the one hand, the thickness of the conductive material is significantly smaller than that of the conventional injection molded shrapnel, which can save more space in the height direction of the sounding device. The side magnet of the sounding device can have a thicker thickness to enhance the acoustic performance of the sounding device. On the other hand, the conductive material is connected to the centering piece, and the centering piece is an integral part, which reduces the number of parts in the sounding device, and the conductive material does not need to be injection molded and fixed in the casing of the sounding device. in. Significantly simplify the production and assembly process of the sounding device. In particular, the metal lining used to join the various parts of the centering struts during the production process can be used directly as the electrically conductive lining. In this way, the continuous punching step after the centering piece is processed can be omitted, and the continuous material can be directly retained on the centering piece as the conductive continuous material.

Alternatively, as shown in Figs. 2 and 4, the floating portion 31 may be directly connected to the end fixing portion 323. The fixed position of the end fixing portion 323 in the sounding device is relatively more stable, and the connection reliability with the floating portion 31 is higher. An electrical circuit may be disposed in the end fixing region 323, and the floating portion 31 is electrically connected to the end fixing region 323. Correspondingly, the conductive material 322 is also connected to the end fixing region 323, and the floating portion 31 and the conductive material 322 are electrically connected through the end fixing region 323.

Optionally, an elastic portion 33 is connected between the floating portion 31 and the end fixing region 323, and the elastic portion 33 can provide a vibration space for the up and down vibration of the floating portion 31. At the same time, a trace is formed in the elastic portion 33 so that the electrical connection point 311 is electrically connected to the end fixing region 323 or the above-mentioned conductive material 322.

The present invention provides several alternative embodiments for the structural shape of the elastic portion. An alternative manner is shown in Figures 2 and 4. The elastic portion 33 is a strip-shaped structure extending in an S-shape. The S-shaped strip structure can provide a larger floating space, and the pulling force for the floating portion 31 is relatively small.

The elastic portion may also be a sheet-like arcuate convex structure extending from the end fixing region toward the floating portion, the structure being similar to the folding ring structure of the diaphragm. The convex direction of the sheet-like arc-shaped convex structure may be a direction toward the diaphragm or a direction away from the diaphragm. The elastic portion of this embodiment can provide a greater traction force and a certain limiting effect on the vibration of the floating portion and the voice coil. Moreover, it is easier to arrange the circuit in such an elastic portion.

The elastic portion may also be a sheet-like wavy structure extending from the end fixing region to the floating portion. Its structural form is similar to the continuous folding ring and reverse folding ring structure on the diaphragm.

Optionally, the sounding device further has two pads 321 for electrically connecting with other external circuits such as a mobile phone. The pad 321 is exposed from the outer surface of the sounding device to form a connection with an external circuit. As shown in FIG. 2, one of the pads 321 is formed on each of the fixing portions 32, and the pads 321 are located on one of the end fixing regions 323 of the fixing portion 32. The electrical connection point 311 located on the floating portion 31 is electrically connected to the pad 321 through the fixing portion 32 and the circuit in the elastic portion 33 described above.

Optionally, two of the electrical connection points 311 are electrically connected to one of the pads 321; the other two electrical connection points 311 are electrically connected to the other of the pads 321 . Through this structural design, two sets of four electrical connection points can be electrically connected to an external circuit, thereby connecting the voice coil into the signal loop. The present invention does not limit which two electrical connection points are electrically connected to which pad, and can be specifically designed according to the needs of the actual product.

For various distributions of pads and electrical connection points, the present invention provides a specific electrical connection embodiment of electrical connection points to pads. However, the present invention is not limited to this embodiment, and other circuit connections may be implemented, and those skilled in the art may select according to specific circuit connection requirements.

Optionally, the first pad is electrically connected to an electrical connection point on the first floating portion and an electrical connection point on the second floating portion through the end fixing region and the conductive connecting material, respectively. The second pad is electrically connected to the other electrical connection point on the first floating portion and the other electrical connection point on the second floating portion through the end fixing region and the conductive bonding material, respectively. Through the above design, four electrical connection points are two or two, and are electrically connected to the two pads respectively. The circuits and signals between the two sets of electrical connection points do not interfere with each other.

In the embodiment shown in FIGS. 2 and 4, preferably, two electrical connection points 311 distributed symmetrically with respect to the center of the voice coil are electrically connected to the same one of the pads 321. This preferred lead end distribution is suitable for the winding process of existing dual voice coil voice coils. The voice coil can be easily wound into the distribution form of the above-mentioned lead ends. The present invention does not limit the manner in which the double voice coil leads must be distributed as described above.

The sounding device further includes a magnetic circuit system in which a magnetic gap is formed. The voice coil can be suspended at the magnetic gap by a connection of the diaphragm. When a sound signal is applied to the voice coil, the voice coil interacts with the magnetic field generated by the magnetic circuit system to cause the voice coil to shift and vibrate.

Optionally, as shown in FIG. 5, the magnetic circuit system is formed with a receiving groove 41, and the conductive material 322 is embedded in the receiving groove 41. The receiving groove 41 can provide positioning for the conductive material 322 to improve the stability of the conductive material 322 and the fixing portion 32 as a whole in the sounding device. By opening the receiving groove 41, a flat plane can be formed in the sounding device for carrying the centering piece 3. The centering piece 3 does not need to be bent in a direction perpendicular to the surface of the piece, which simplifies the structure and processing of the centering piece and reduces the cost of the centering piece.

The magnetic circuit system may include a side magnet and a center magnet, and the magnetic gap is formed between the side magnet and the center magnet. Preferably, the accommodating groove 41 is formed at a position on the side magnet 4 on a side away from the magnetic gap. In the manner as shown in Figs. 5 and 6, the accommodating groove 41 extends inwardly from the outer edge of the side magnet 4 by a small length. This length is greater than or equal to the width of the conductive web 322. Another advantage of this structural design is that it can more effectively concentrate the magnetic field generated by the magnetic circuit system into the magnetic gap, and relatively increase the magnetic field strength in the magnetic gap.

In another optional embodiment, the sounding device further includes a housing 5, as shown in FIG. 7, the housing 5 is configured to carry the centering piece 3, the diaphragm 1, the voice coil 2, and Components in other sounding devices. The edge of the diaphragm 1 can be fixedly connected to the housing 5, and the fixing portion of the centering piece 3 is fixed to the housing 1. The voice coil 2 can be suspended in the casing 5 through the diaphragm 1, and a certain accommodation space is formed in the casing 5 for accommodating the voice coil 2 and other components. Preferably, the housing 5 is formed with a receiving groove 41. The fixing portion is fixedly placed on the casing 5, and the conductive material 322 thereon is embedded in the receiving groove 41 of the casing.

The above two forms of forming the receiving groove can be selected according to the performance and structural characteristics of the actual product. Further, based on the above two embodiments, further, the surface of the sounding device for carrying the end fixing region 323 and the bottom surface of the receiving groove 41 are flush with each other. Thus, the fixing portion 32 as a whole, including the end fixing portion 323 and the conductive lining, can be distributed and fixed on a flat plane as shown in FIG. The centering piece 3 can have a flat plate structure as a whole, which reduces the processing difficulty and assembly difficulty of the centering piece 3. Moreover, the space utilization in the sounding device is higher, and the overall height can be lowered.

Optionally, as shown in FIG. 3 and FIG. 4, the voice coil may have a rectangular structure as a whole, and the sounding device has an approximately rectangular structure as a whole. Two of the floating portions 31 are preferably attached to the two short sides of the voice coil. The voice coil 2 is more likely to be polarized in a direction parallel to the long side, and the floating portion 31 at the end of the long side (i.e., attached to the short side) can more effectively suppress the polarization of the voice coil.

As shown in FIG. 4, the conductive binder 322 preferably extends in a direction parallel to the long sides of the voice coil 2, and the two conductive materials 322 are respectively located at the periphery of the two long sides of the voice coil 2. Thus, on the one hand, the conductive material 322 does not interfere with the vibration space of the voice coil 2; on the other hand, the extended form of the conductive material 322 is also more space-saving, and other structures of the sounding device are provided for the conductive material 322 to provide a receiving groove. Such as fixed limit.

For the material of the centering piece, an alternative embodiment is that the centering piece is integrally formed as an integrally formed FPCB board (flexible circuit board). The FPCB board has good elastic deformation capability, and is provided with circuit traces, and the surface thereof is also convenient to form electrical connection points, pads and the like. The floating portion and the fixed portion formed by the FPCB board can provide good support for the voice coil, suppress polarization, and provide sufficient free deformation to avoid interference with the acoustic performance of the voice coil. The conductive lining formed by the FPCB board is significantly reduced in thickness relative to the conventional injection molded shrapnel, and can play a significant role in saving space in the sounding device.

The present invention provides an alternative embodiment for the manner in which the individual lead ends are distributed. The voice coil 2 is integrally formed by two voice coils 2, and the two wire ends 211 and the two wire ends 212 of the two voice coils 2 are respectively used as the four lead terminals 21. As shown in FIG. 3, the two incoming end 211 are symmetrically distributed with respect to the center of the voice coil 2, and the two outgoing ends 212 are symmetrically distributed with respect to the center of the voice coil 2, and the incoming end 211 and the outgoing line. The ends 212 are symmetrically distributed with respect to the centerline of the voice coil 2.

While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A sounding device, comprising:

a diaphragm and a voice coil, the voice coil is formed by winding two voice coils and has four lead ends, and the diaphragm is connected to one side of the voice coil;

a centering piece having a conductive line connecting the voice coil and an external circuit, the centering piece comprising two fixing portions and two floating portions, the floating portion being connected to the voice coil On the other side opposite to the diaphragm, the two floating portions are distributed in a central symmetry with respect to the center of the voice coil, and two electrical connection points are formed on each of the floating portions, and the four leads are formed. One-to-one correspondence is connected to the four electrical connection points;

Two ends of the two floating portions are respectively connected to the two fixing portions, the fixing portion includes a conductive material and two end fixing regions, and the conductive material is connected between the two end fixing regions An electrical connection is formed between the two floating portions by the fixing portion.
The sound emitting device according to claim 1, wherein said floating portion is coupled to said end fixing portion.
The sounding device according to claim 2, wherein an elastic portion is connected between the end fixing portion and the floating portion.
The sounding device according to claim 3, wherein the elastic portion is a strip-shaped structure extending in an S-shape;

Or the elastic portion is a sheet-like arc-shaped convex structure extending from the fixing portion to the floating portion, and the convex convex direction of the curved convex structure faces the diaphragm or is away from the diaphragm;

Alternatively, the elastic portion is a sheet-like wavy structure extending from the fixing portion to the floating portion.
The sound emitting device according to claim 1, wherein each of said fixing portions is formed with a pad on said end fixing portion.
The sound emitting device according to claim 5, wherein one of said pads is electrically connected to two electrical connection points on the two floating portions, and the other of said pads is separately formed on the two floating portions The two electrical connection points are electrically connected.
The sounding device according to claim 6, wherein two electrical connection points symmetrically distributed with respect to a center of the voice coil are electrically connected to the same one of the pads.
The sounding device according to claim 1, further comprising a magnetic circuit system, wherein a magnetic gap is formed in the magnetic circuit system, the voice coil is located in the magnetic gap, and the magnetic circuit system is formed on the magnetic circuit system The receiving groove is embedded in the receiving groove.
The sounding device according to claim 8, wherein the magnetic circuit system comprises a side magnet and a center magnet, and the magnetic gap is formed between the side magnet and the center magnet;

The accommodating groove is formed at a position on the side magnet away from the side of the magnetic gap.
The sounding device according to claim 1, further comprising a housing configured to carry the diaphragm and the centering piece, the voice coil being located in the housing, A receiving groove is formed in the housing, and the conductive material is embedded in the receiving groove.
The sounding device according to any one of claims 8 to 10, wherein a surface of the sounding device for carrying the end fixing region is flush with the receiving groove, and the conductive portion of the fixing portion The material and the two end fixing zones are on one plane.
The sounding device according to any one of claims 1 to 10, wherein the voice coil has a rectangular structure, and the two floating portions are respectively attached to the two short sides of the voice coil.
The sounding device according to any one of claims 1 to 10, wherein the centering piece is an integrally provided FPCB board.