CN109788405B

CN109788405B - Sound production device and assembly method

Info

Publication number: CN109788405B
Application number: CN201811565034.XA
Authority: CN
Inventors: 高远; 李振军; 付达
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-12-20
Filing date: 2018-12-20
Publication date: 2020-08-25
Anticipated expiration: 2038-12-20
Also published as: CN109788405A; WO2020125126A1

Abstract

The invention discloses a sound generating device and an assembling method, wherein the sound generating device comprises a vibration component and a magnetic circuit component; the vibration subassembly includes vibrating diaphragm and voice coil loudspeaker voice coil, the vibrating diaphragm edge is fixed to be set up, the voice coil loudspeaker voice coil is connected one side of vibrating diaphragm is surperficial, magnetic circuit subassembly includes magnetic yoke and magnet group, magnet group is including bonding at the central magnet that magnetic yoke central point put and the limit magnet of setting at magnetic yoke edge, limit magnet is fixed on magnetic yoke through the mode of moulding plastics, form the magnetic gap between limit magnet and the central magnet, the voice coil loudspeaker voice coil hangs in the magnetic gap. According to the invention, the fixing performance of the edge magnet is increased by improving the injection molding and fixing of the edge magnet on the magnetic guide yoke, so that the edge magnet is not easy to fall off.

Description

Sound production device and assembly method

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a sound production device and an assembly method.

Background

In recent years, consumer electronics have been rapidly developed, and electronic devices such as smart phones and VR devices have been recognized by consumers and are widely used. Those skilled in the art have made corresponding improvements to related accessories, such as earphones, etc., to meet the performance requirements of electronic products and the requirements of consumers on the product performance.

Sound generating devices are important electroacoustic transducer components in consumer electronics, and are widely used as speakers, earphones, and the like. As the performance of electronic products improves, there is also a necessary trend regarding the improvement of the acoustic performance of sound emitting devices.

The existing sound generating device is provided with a magnetic circuit system, wherein the magnetic circuit system comprises a magnet, a magnetic conduction plate and other parts which are assembled together to form the magnetic circuit system. However, the connection reliability between the components in the existing magnetic circuit system is relatively low, and phenomena such as loose components and unstable assembly are easy to occur. When the sound generating device is collided, the magnetic circuit system may be scattered.

Therefore, there is a need for an improved structure of the existing sound generating device or the structure of the components thereof to ensure further improvement of the performance of the speaker.

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, there is provided a sound generating device comprising a vibration assembly and a magnetic circuit assembly; the vibration component comprises a vibrating diaphragm and a voice coil, the edge of the vibrating diaphragm is fixedly arranged, and the voice coil is connected to the surface of one side of the vibrating diaphragm; the magnetic circuit assembly comprises a magnetic yoke and a magnet group, wherein the magnet group comprises a central magnet adhered to the central position of the magnetic yoke and edge magnets arranged on the edge of the magnetic yoke; the side magnets are fixed on the magnetic guide yoke in an injection molding mode, and the central magnet is fixedly arranged on the magnetic guide yoke; the edge magnets surround the central magnet, a magnetic gap is formed between the edge magnets and the central magnet, and the voice coil is suspended in the magnetic gap.

Optionally, a connecting portion is disposed at an edge of the magnetic yoke, and the connecting portion is embedded in the edge magnet.

Optionally, the joint of the connecting portion and the magnetic yoke is a smooth chamfer.

Optionally, the connecting portion is bent and extended in a direction close to the central magnet.

Optionally, the length of the connecting portion in the extending direction of the edge of the magnetic conductive yoke is smaller than the length of the side magnet.

Optionally, the length of the connecting part is 1/4-1/3 of the length of the side magnet.

Optionally, the edge magnet is a plastic magnet.

Alternatively, the plastic magnet is prepared by mixing fine magnetic particles and a thermoplastic organic polymer.

Optionally, the fine-grained magnetic particles are ferrites and rare earth metals.

According to another aspect of the present invention, there is provided a method of assembling a sound emitting device, comprising:

providing a magnetic guide yoke and an injection mold, wherein the injection mold is provided with a groove for forming a side magnet;

placing the magnetic conduction yoke in an injection mold, and injection molding a side magnet fixedly connected to the magnetic conduction yoke in the injection mold, wherein the side magnet is positioned at the edge of the magnetic conduction yoke;

a central magnet is arranged at the central position of the magnetic guide yoke, and a magnetic gap is formed between the side magnet and the central magnet;

the utility model provides a vibration subassembly, vibration subassembly includes vibrating diaphragm and voice coil loudspeaker voice coil, the edge fixed setting of vibrating diaphragm, the voice coil loudspeaker voice coil is connected on one side surface of vibrating diaphragm, will the voice coil loudspeaker voice coil hang in the magnetic gap.

The invention has the beneficial effects that the fixing performance of the edge magnet is increased by improving the injection molding and fixing of the edge magnet on the magnetic guide yoke, so that the edge magnet is not easy to fall off. The technical task to be achieved or the technical problems to be solved by the present invention are never thought or not expected by those skilled in the art, and therefore the present invention is a new technical solution.

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 a schematic structural view of a magnetic circuit assembly in an embodiment of a sound generating apparatus of the present invention.

Fig. 2 is a schematic structural diagram of the sound generating device of the present invention after the magnetic circuit assembly is injection molded.

Fig. 3 is an enlarged view of portion a of fig. 2 of an embodiment of the sound generating device of the present invention.

Fig. 4 is a schematic view of an embodiment of the method of assembling the sound generating apparatus of the present invention.

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.

Referring to fig. 1 and 2, an embodiment of the present invention provides a sound generating apparatus, including a vibration component and a magnetic circuit component; the vibration component comprises a vibrating diaphragm and a voice coil, the edge of the vibrating diaphragm is fixedly arranged, and the voice coil is connected to the surface of one side of the vibrating diaphragm; the magnetic circuit assembly comprises a magnetic yoke 1 and a magnet group, wherein the magnet group comprises a central magnet adhered to the central position of the magnetic yoke 1 and edge magnets 2 arranged on the edge of the magnetic yoke 1; the side magnets 2 are fixed on the magnetic guide yoke 1 in an injection molding mode, and the central magnet is fixedly arranged on the magnetic guide yoke 1; the side magnet 2 surrounds the center magnet, a magnetic gap is formed between the side magnet 2 and the center magnet, and the voice coil is suspended in the magnetic gap.

In the embodiment of the present invention, in the magnetic circuit assembly, the connection relationship between the magnetic yoke 1 and the side magnet 2 is not bonded by glue, but the side magnet 2 is directly injection-fixed to the magnetic yoke 1 by means of injection molding. The contact area between the side magnet 2 and the magnetic yoke 1 is small, and the side magnet is easy to fall off by adopting adhesive bonding. The magnetic yoke can be directly and tightly connected with the edge magnet by adopting an injection molding method. For example, the edge magnet is formed on the surface of the magnetic yoke by injection molding, or coated on the edge of the magnetic yoke by injection molding. The magnetic yoke can be embedded into the edge magnet through injection molding, and the connection reliability of the magnetic yoke and the edge magnet is remarkably improved.

In an alternative embodiment of the present invention, the edge of the magnetic yoke 1 is provided with a connecting portion 3, the connecting portion 3 extends from the edge of the magnetic yoke 1, and the connecting portion 3 is embedded in the edge magnet 2.

During injection molding, the edge magnet 2 is injection molded around the connecting portion 3, and at least a part of the structure of the connecting portion 3 is wrapped in the edge magnet 2. A portion of the connecting portion 3 extending from the edge magnet 2 is connected to the yoke 1. By means of the structural design, the connection reliability between the edge magnet and the magnetic conduction yoke can be remarkably improved.

Preferably, the connecting portion and the magnetic conductive yoke may be integrally formed as a single component, so that the connection between the connecting portion and the magnetic conductive yoke is more reliable. Or alternatively, the connecting part and the magnetic conductive yoke can be two separate parts, and the fixed connection is realized through a processing technology such as welding.

Alternatively, as shown in fig. 3, the joint portion 3 and the yoke 1 may be smoothly chamfered. The smooth chamfer can ensure that stress concentration is not generated at the joint of the connecting part 3 and the magnetic yoke 1, the damage is not easy, in addition, the whole magnetic circuit part can be integrally smooth, and the assembly inside the sound generating device is convenient.

In another embodiment of the present invention, referring to fig. 3, the connecting portion 3 is bent and extended in a direction close to the central magnet. The bending structure enables the connecting part 3 to be in a state of extending into the magnet when injection molding is carried out, the extending part is deep, and the bending structure can increase the fixing firmness. In the embodiment in which the connecting portion and the magnetic yoke are integrally formed, the connecting portion may be formed by directly cutting the edge of the magnetic yoke, and then bending the connecting portion. The connecting portion may be formed in a bent shape as shown in fig. 3.

In another embodiment of the present invention, the length of the connecting portion 3 in the direction in which the edge of the yoke 1 extends is smaller than the length of the edge magnet 2.

In the present embodiment, the yoke 1 has a rectangular or quasi-rectangular shape, the connecting portions 3 are provided on four sides of the rectangular yoke 1, the connecting portions 3 are aligned in the longitudinal direction with the extending direction of the edge of the yoke 1 on which they are located, and the side magnets 2 are also provided in the form of long strips on the edge of the yoke 1, so that the longitudinal direction of the connecting portions 3 is aligned with the side magnets 2.

The length of the connecting portion 3 is smaller than that of the side magnet 2 and does not affect the fixing property. Because both ends of the connecting part 3 can not extend out of the edge magnets 2, the contact area between the edge magnets 2 and the connecting part 3 is increased, and the edge magnets 2 wrap the connecting part 3 from the front, the side and the top of the connecting part in multiple directions, so that the reliability of fixed connection is improved. The connecting part 3 only has the fixing function, and the connecting part 3 has moderate length, so that raw materials can be saved, and the weight of the whole device can be reduced.

In a preferred embodiment, the length of the connecting part 3 is 1/4-1/3 of the length of the side magnet 2. This ratio range of the connecting portion 3 and the edge magnet 2 can achieve an optimum effect in terms of fixing reliability, weight reduction of the entire apparatus, and processing difficulty.

In the embodiment of the present invention, the center magnet is fixed to the middle of the yoke 1 by bonding. The central magnet is positioned in the middle of the magnetic yoke 1, and has a large area, so that the central magnet is easily fixed by bonding. The central magnet can continue to be attached by means of the prior art adhesive.

The cooperation of two kinds of means uses like this, both can guarantee that fixed intensity is high, also can reduce the processing degree of difficulty simultaneously.

In the embodiment of the present invention, the edge magnet 2 is a plastic magnet, and the plastic magnet has the advantages of light weight and easier processing compared with a conventional magnet.

Alternatively, the plastic magnet is prepared by mixing fine magnetic particles and a thermoplastic organic polymer. In the actual processing process, the fine-grained magnetic particles can be mixed with the thermoplastic organic polymer to form an injection molding material with certain fluidity. Thereafter, the injection molding material is charged into the injection mold. The yoke may be pre-set in the injection mold. Through injection mold's structural design for the injection molding material is filled on the yoke, finally forms the limit magnet of fixed connection on the yoke.

Referring to fig. 4, an embodiment of the present invention provides an assembly method of a sound generating apparatus, including:

providing a magnetic guide yoke 1 and an injection mold, wherein the injection mold is provided with a groove for forming a side magnet 2;

placing a magnetic guide yoke 1 in an injection mold, and injection molding a side magnet 2 fixedly connected to the magnetic guide yoke 1 in the injection mold, wherein the side magnet 2 is positioned at the edge of the magnetic guide yoke 1;

a central magnet is arranged at the central position of the magnetic yoke 1, and a magnetic gap is formed between the side magnet 2 and the central magnet;

Preferably, in the embodiment where the magnetic yoke 1 has the connecting portion 3, the magnetic yoke 1 is placed in the front mold 4 of the injection mold, and the connecting portion 3 is located just inside the groove of the rear mold 5 for molding the edge magnet. After the injection molding material is filled into the injection mold, the injection molding material can be filled into the groove, and the edge magnet is wrapped inside the groove. After the injection molding material is cooled, the formed edge magnet 2 is wrapped around the connecting part 3. The reliability of the connection between the edge magnet and the magnetic yoke is remarkably improved.

When the central magnet is fixed, the central magnet can be used for gluing and bonding, and the effective area of the central magnet is large, so that an adhesive can be selected for bonding and fixing during fixing.

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 production device is characterized by comprising a vibration component and a magnetic circuit component;

the vibration component comprises a vibrating diaphragm and a voice coil, the edge of the vibrating diaphragm is fixedly arranged, and the voice coil is connected to the surface of one side of the vibrating diaphragm;

the magnetic circuit assembly comprises a magnetic yoke and a magnet group, wherein the magnet group comprises a central magnet adhered to the central position of the magnetic yoke and edge magnets arranged on the edge of the magnetic yoke;

the side magnets are fixed on the magnetic guide yoke in an injection molding mode, the central magnet is fixedly arranged on the magnetic guide yoke, and the side magnets are plastic magnets;

the edge magnets surround the central magnet, a magnetic gap is formed between the edge magnets and the central magnet, and the voice coil is suspended in the magnetic gap.

2. The sound generating apparatus as claimed in claim 1, wherein the yoke has a connecting portion at an edge thereof, and the connecting portion is embedded in the edge magnet.

3. The sound generating apparatus as claimed in claim 1, wherein the connecting portion is smoothly chamfered at a junction with the yoke.

4. The sound generating apparatus as claimed in claim 3, wherein the connecting portion is bent and extended in a direction close to the central magnet.

5. The sound generator as claimed in claim 4, wherein the length of the connecting portion along the extension direction of the edge of the magnetic yoke is smaller than the length of the edge magnet.

6. The sound generating device as claimed in claim 5, wherein the length of the connecting part is 1/4-1/3 of the length of the side magnet.

7. The sound-generating apparatus as claimed in claim 1, wherein the plastic magnet is prepared by mixing fine magnetic particles with a thermoplastic organic polymer.

8. The sound-generating apparatus of claim 7 wherein the fine-grained magnetic particles are ferrites and rare earth metals.

9. A method of assembling a sound generating device, comprising:

a central magnet is arranged at the central position of the magnetic guide yoke, a magnetic gap is formed between the side magnet and the central magnet, and the side magnet is a plastic magnet;