CN110972040A

CN110972040A - Voice coil assembly, sound production device and electronic product

Info

Publication number: CN110972040A
Application number: CN201911382205.XA
Authority: CN
Inventors: 丁庆霞; 牟宗君
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-04-07

Abstract

The invention discloses a voice coil assembly, a sound production device and an electronic product. The voice coil assembly includes: a coil wound into a barrel-like structure; the inner framework layer is arranged on one side of the inner ring of the coil; the outer framework layer is arranged on one side of the outer ring of the coil; the height of the inner skeleton layer and/or the outer skeleton layer is larger than that of the coil; the inner framework layer and the outer framework layer are made of aluminum-based alloy. This sound generating mechanism includes: the vibrating diaphragm is connected to the end face of the voice coil assembly; a magnetic circuit system configured to generate a magnetic field; the coil is configured to be energized with an electrical signal to cause the voice coil assembly to vibrate and sound relative to the magnetic circuit system under the action of a magnetic field.

Description

Voice coil assembly, sound production device and electronic product

Technical Field

The invention belongs to the technical field of sound generating devices, and particularly relates to a voice coil assembly for a sound generating device, the sound generating device and an electronic product.

Background

In recent years, consumer electronics have been developed rapidly, and electronic devices such as mobile phones and tablet computers are widely used by consumers. Among them, speakers are important acoustic components in electronic products for converting electrical signals into sound for consumers to listen to. With the rapid development of the related technologies of electronic products, consumers have made higher performance demands on the acoustic performance of electronic products. In such circumstances, there is a need for corresponding improvements in acoustic devices by those skilled in the art.

The voice coil assembly is an important part of the sound generating device, and in practical application, the voice coil assembly can be communicated with sound signals so as to generate vibration by matching with a magnet in the sound generating device. The voice coil assembly can drive the vibrating diaphragm to vibrate and produce sound. In the prior art, the voice coil assembly has the technical defects of insufficient structural rigidity, limited connection reliability with the vibrating diaphragm and the like. These technical defects can cause the problems of easy polarization, abnormal resonance and the like of the voice coil assembly and the diaphragm in the working engineering. For the sound production device in the present stage needs to have full-band sound production performance, the heat dissipation of the voice coil assembly and the diaphragm also has defects. A large amount of heat gathering can make sound generating mechanism's inside atmospheric pressure sound production change in sound generating mechanism, and then causes the vibrating diaphragm vibration to receive atmospheric pressure to influence vibration asymmetry, polarization phenomenon appear, and voice coil assembly temperature rises and then influences reliability and acoustic performance.

Disclosure of Invention

It is an object of the present invention to provide an improved voice coil assembly for a sound generating device.

According to a first aspect of the present invention, there is provided a voice coil assembly for a sound generating device, comprising:

a coil wound into a barrel-like structure;

the inner framework layer is arranged on one side of the inner ring of the coil;

the outer framework layer is arranged on one side of the outer ring of the coil;

the height of the inner skeleton layer and/or the outer skeleton layer is larger than that of the coil;

the inner framework layer and the outer framework layer are made of aluminum-based alloy.

Optionally, the inner skeleton layer and/or the outer skeleton layer are made of aluminum magnesium alloy.

Optionally, a graphene layer is attached to the inner skeleton layer.

Optionally, a graphene layer is attached to the exoskeleton layer.

Optionally, the graphene layer is located on a side of the inner skeleton layer away from the coil.

Optionally, the graphene layer is located on a side of the exoskeleton layer remote from the coil.

Optionally, the graphene layer has a thickness in the range of one quarter to one third of the thickness of the inner and/or outer skeleton layer.

Optionally, the inner and/or outer carcass layers have a thickness in the range of one third to one half of the thickness of the coil.

Optionally, an adhesive connection is formed between the inner and outer armature layers and the coil.

The present invention also provides a sound generating apparatus, comprising:

in the voice coil assembly, the vibrating diaphragm is connected to the end face of the voice coil assembly;

a magnetic circuit system configured to generate a magnetic field;

the coil is configured to be energized with an electrical signal to cause the voice coil assembly to vibrate and sound relative to the magnetic circuit system under the action of a magnetic field.

The present invention also provides an electronic product, comprising:

the product comprises a product main body, a sound outlet and a sound guide plate, wherein the product main body is provided with a sound outlet;

the above sound-producing device is disposed in the product main body, the sound-producing device is configured to work to produce sound, and the sound outlet is used for sound to come out.

One technical effect of the present invention is to improve the structural reliability of a voice coil assembly.

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 cross-sectional view of a voice coil assembly provided by 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.

The invention provides a voice coil assembly for a sound generating device. The coil is wound to form a barrel-shaped structure, for example, a cylindrical barrel-shaped structure which can be circular, or a cylindrical barrel-shaped structure which can be rectangular, rectangular with round corners, and the like. Fig. 1 shows a longitudinal sectional structure of the voice coil assembly, in which the inner bobbin layer 21 is disposed on the inner circumference side of the coil 1, and the outer bobbin layer 22 is disposed on the outer circumference side of the coil 1. The inner and

outer layers

21, 22 form a sandwich construction for the coil.

The inner frame layer 21 and the outer frame layer 22 may be in a complete ring-shaped structure, so as to provide a good overall bearing and supporting effect for the whole coil. Optionally, the inner frame layer 21 and the outer frame layer 22 may also be in a discontinuous structure in the circumferential direction of the coil, so that the influence of the inner frame layer and the outer frame layer on the weight of the voice coil assembly is reduced as much as possible on the premise of satisfying the supporting effect on the coil.

As shown in fig. 1, the height of the inner frame layer 21 and/or the outer frame layer 22 in the axial direction of the coil 1 is larger than the height of the coil 1 itself, and the inner frame layer 21 and the outer frame layer 22 are made of an aluminum-based alloy. The height of one of the inner framework layer 21 and the outer framework layer 22 is designed to be larger than that of the coil 1, so that on one hand, the coil 1 can be protected, and the overall heat dissipation performance of the voice coil assembly is improved. On the other hand, the inner frame layer 21 and/or the inner frame layer 21 higher than the coil 1 may be used to form a connection with the diaphragm of the sound generating apparatus. For example, the upper end face of the inner skeleton layer 21 and/or the outer skeleton layer 22 is fixedly connected with the surface of the diaphragm. The inner framework layer 21 and the outer framework layer 22 have high structural reliability, and the connection reliability of the inner framework layer and the outer framework layer with the vibrating diaphragm is higher. Preferably, under the condition that the heights of the inner skeleton layer 21 and the outer skeleton layer 22 are both greater than the height of the coil 1, the end surfaces of the inner skeleton layer 21 and the outer skeleton layer 22 can be fixedly connected with the diaphragm, so that the connection area of the voice coil assembly and the diaphragm is effectively increased, and the connection reliability is improved.

The inner framework layer and/or the outer framework layer are/is made of aluminum-based alloy, so that the heat dissipation function can be better realized on the premise of meeting the structural reliability of the voice coil assembly, heat generated during the operation of the voice coil is bidirectionally led out through the inner framework layer and the outer framework layer, and the heat dissipation rate is improved.

The aluminum-based alloy referred to in the present invention means aluminum as a main material. Further, other metal materials or non-metal materials can be doped into the aluminum material to form an alloy material. Alternatively, only a small amount of other materials may be added to the aluminum material to improve the properties of the aluminum-based alloy. The aluminum-based material also comprises a technical scheme of directly using aluminum as a material to manufacture the framework layer, in the technical scheme, the aluminum material usually contains trace impurities of other elements, and the scheme also belongs to the protection scope of the aluminum-based alloy. In addition, the aluminum-based alloy also comprises aluminum-magnesium alloy, aluminum-manganese alloy and the like.

The voice coil assembly for the sound generating device can effectively improve the integral rigidity of the voice coil assembly, obviously improves the structural reliability, and solves the structural problems that the coil is not easy to deform in work and the like. Further, because the structural reliability of the voice coil assembly is improved, the acoustic problems such as polarization and abnormal resonance are not easy to occur. The sound generating device has a high-frequency resonant frequency related to its own structural characteristics. When voice coil loudspeaker voice coil subassembly and vibrating diaphragm execution high frequency vibration, the condition of high frequency resonance probably appears, and then the vibrating diaphragm, voice coil loudspeaker voice coil subassembly abnormal resonance situation that the atress direction is different appears. In this resonance state, it is possible for the voice coil assembly and the diaphragm to vibrate in different directions at the same time. On the one hand, such abnormal resonance may reduce the sensitivity of the sound generating device, affecting the learning performance; on the other hand, the mutual pulling between the diaphragm and the voice coil assembly may cause structural damage to the device. According to the invention, the inner framework layer and the outer framework layer are arranged on the voice coil assembly, so that the structural reliability of the voice coil assembly is improved, the vibration stability of the voice coil assembly is stabilized, the occurrence of abnormal resonance is further reduced, and the possibility of damage to the voice coil assembly and the vibrating diaphragm in an abnormal vibration state is reduced.

Optionally, the inner skeleton layer and/or the outer skeleton layer are made of aluminum magnesium alloy. Under the condition that the framework layers of the aluminum-magnesium alloy can ensure enough structural strength, the weight of the two framework layers can be reduced to a certain degree, and the heat-conducting performance of the two framework layers is improved. The overall weight of the inner framework layer and the outer framework layer is reduced, and the overall vibration sensitivity of the voice coil assembly can be increased, so that more accurate vibration response is made to the voice signal, and the voice restoration degree of the voice signal is improved.

Alternatively, as shown in fig. 1, the inner skeleton layer 21 may be attached with a graphene layer 3. Graphene layer 3 has good heat conductivility to in the heat that produces when working coil 1 transmits the air around the voice coil assembly fast, reduce coil 1's temperature. In the technical scheme of the invention, the inner framework layer 21 and the outer framework layer 22 positioned at the inner side and the outer side of the coil 1 can provide good bidirectional heat dissipation effect. On the basis, the graphene layer 3 is further attached to the inner skeleton layer 21, so that heat conduction can be better realized.

Alternatively, as shown in fig. 1, the graphene layer 3 may be attached to the outer frame layer 22, so as to improve the heat dissipation performance of the coil 1 on the outer frame layer 22 side.

In the embodiment shown in fig. 1, the voice coil assembly forms a 5-layer structure in the radial direction thereof, the coil 1 is located in the middle of the 5-layer structure, and the inner skeleton layer 21 and the outer skeleton layer 22 are respectively located at two sides of the coil 1, and are used for fixing and supporting the coil 1. The outer sides of the two layers of framework layers are respectively provided with two graphene layers 3, and the two graphene layers 3 are used for playing a role in heat conduction. The graphene layer 3 has a higher thermal conductivity than the inner skeleton layer 21 and the outer skeleton layer 22. Which can effectively conduct the heat on the coil 1, the inner frame layer 21 and the outer frame layer 22 to the surrounding air.

In an alternative embodiment of the present invention, the graphene layer 3 may be attached to the inner skeleton layer 21, the graphene layer 3 may be attached to the outer skeleton layer 22, or the graphene layer 3 may be attached to both the inner skeleton layer 21 and the outer skeleton layer 22. In practical application, whether the graphene layer is arranged or not can be selected according to the internal structure characteristics of the sound generating device and the heat dissipation space distribution position, and therefore a better heat dissipation effect matched with the reality is achieved.

Alternatively, the graphene layer 3 may be attached to a surface of the inner skeleton layer 21 on a side away from the coil 1. Optionally, the graphene layer 3 may also be attached to a surface of the exoskeleton layer 22 on a side remote from the coil 1. Figure 1 illustrates such an embodiment. According to the embodiment, under the condition that efficient heat dissipation is realized by the graphene layer 3, the overall structural stability of the voice coil assembly is ensured as much as possible, and the framework layer is directly connected with the coil 1, so that the risk of looseness and deformation of the coil 1 is reduced.

In other embodiments, the graphene layer may be disposed on the surface of the inner and outer skeleton layers on the side close to the coil. This embodiment has the advantage that heat can be conducted away from the coil more efficiently. In particular, graphene layers may be provided on both the inner side surface and the outer side surface of at least one of the inner skeleton layer and the outer skeleton layer, thereby further improving the heat dissipation performance.

Optionally, the graphene layer has a thickness in the range of one quarter to one third of the thickness of the inner and/or outer skeleton layer. The thickness of the graphene layer is designed in the range, so that the structural strength of the graphene layer can be guaranteed, and the graphene layer is prevented from falling off from the inner framework layer and/or the outer framework layer. On the other hand, a sufficient thickness enables it to exhibit good heat-conducting properties. In addition, by controlling the thickness of the graphene layer, the overall weight of the voice coil assembly can also be controlled.

Alternatively, the graphene layer may be fixed on the inner skeleton layer and the outer skeleton layer by using a vapor deposition process. Alternatively, the skeleton layer may be provided by coating, plating, or the like. In particular, providing a graphene layer by a vapor deposition process can make the graphene layer better

Optionally, the inner and/or outer carcass layers have a thickness in the range of one third to one half of the thickness of the coil. By controlling the thickness of the inner framework layer and/or the outer framework layer, the overall weight of the voice coil assembly can be effectively controlled, and the loss of vibration sensitivity caused by the phenomenon of overweight of the voice coil assembly is avoided. Optionally, the thickness of the inner and/or outer carcass layers may be between 50-70 microns.

Optionally, the coil may be directly wound around the inner frame layer, and then the outer frame layer is sleeved on the periphery of the coil. Alternatively, the outer frame layer and the inner frame layer may be positioned in advance, and then the coil may be wound between the outer frame layer and the inner frame layer.

Alternatively, the inner and outer armature layers may each be in bonded connection with the coil. Adopt adhesive connection's mode, can improve the overall structure uniformity of voice coil loudspeaker voice coil subassembly, reduce the risk that appears becoming flexible between coil and interior skeleton layer, the outer skeleton layer.

In an optional implementation manner, the coil may be an enameled wire, and when the voice coil is wound and formed on the inner skeleton layer and the outer skeleton layer, the enameled wire layer on the surface of the enameled wire can generate an adhesive property by heating, so that the coil, the inner skeleton layer and the outer skeleton layer are bonded and connected.

The invention also provides a sound production device which comprises the vibrating diaphragm, the voice coil assembly and the magnetic circuit system. The vibrating diaphragm is connected to the end face of the voice coil assembly in a barrel-shaped structure. The inner framework layer and the outer framework layer can be fixedly connected with the end faces of the inner framework layer and the outer framework layer in a bonding mode. The magnetic circuit system is used for generating a magnetic field. The voice coil assembly is arranged in a magnetic field generated by the magnetic circuit system, and after alternating sound signals are introduced into the coil, electromagnetic acting force can be generated between the voice coil assembly and the magnetic circuit system, so that the voice coil assembly and the vibrating diaphragm vibrate. The diaphragm generates sound by vibrating.

The invention also provides an electronic product which can be consumer electronic products such as mobile phones, earphones, tablet computers and the like. The electronic product comprises a product main body and the sound production device. The product main body is provided with a sound outlet. The sound generating device is arranged in the product main body. The sound generating device is configured to be electrically operable to generate sound. The sound outlet is used for transmitting the sound generated by the sound outlet to the outside.

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 voice coil assembly for a sound generating device, comprising:

a coil wound into a barrel-like structure;

2. The voice coil assembly of claim 1, wherein the inner and/or outer armature layers are made of an aluminum magnesium alloy.

3. The voice coil assembly of claim 1, wherein the inner former layer is accompanied by a graphene layer.

4. The voice coil assembly of claim 1, wherein a graphene layer is attached to the exoskeleton layer.

5. The voice coil assembly of claim 3, wherein the graphene layer is located on a side of the inner armature layer distal from the coil.

6. The voice coil assembly of claim 4, wherein the graphene layer is located on a side of the exoskeleton layer distal from the coil.

7. A voice coil assembly according to any of claims 3 to 6, characterised in that the graphene layer has a thickness in the range of one quarter to one third of the thickness of the inner and/or outer former layers.

8. The voice coil assembly of claim 1, wherein the thickness of the inner and/or outer armature layer ranges from one third to one half of the thickness of the coil.

9. The voice coil assembly of claim 1, wherein the inner and outer bobbin layers form an adhesive connection with the coil.

10. A sound generating device, comprising:

a diaphragm and the voice coil assembly of any one of claims 1 to 9, the diaphragm being attached to an end face of the voice coil assembly;

a magnetic circuit system configured to generate a magnetic field;

11. An electronic product, comprising:

the sound generating device of claim 10, disposed within the product body, the sound generating device configured to be operable to generate sound, the sound outlet for sound to exit.