CN106162466B

CN106162466B - Loudspeaker

Info

Publication number: CN106162466B
Application number: CN201610769300.5A
Authority: CN
Inventors: 杨卓; 牟宗君; 邵明辉
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2022-04-05
Anticipated expiration: 2036-08-30
Also published as: CN106162466A

Abstract

The invention discloses a loudspeaker. The loudspeaker comprises a shell, a magnetic circuit system and a vibration system, wherein a magnetic gap is formed in the magnetic circuit system, the vibration system comprises a vibrating diaphragm and a voice coil, the vibrating diaphragm is fixed on the shell, one end of the voice coil is connected to the vibrating diaphragm, the voice coil extends into the magnetic gap, and a first heat conduction layer is arranged on the inner surface of the magnetic gap. The loudspeaker can quickly transfer heat generated by the voice coil, and avoids heat generated by the voice coil from accumulating in a magnetic gap space to cause the heat of the voice coil to be dissipated and the vibrating diaphragm to be deformed by heating.

Description

Loudspeaker

Technical Field

The invention relates to the field of electroacoustic, in particular to a loudspeaker.

Background

With the rapid development of portable electronic devices, the product appearance of the micro-speaker is increasingly light and thin, the miniaturization trend is obvious, the magnetic gap space is increasingly small, and the power is increasingly large. Generally, a speaker includes a housing, a magnetic circuit system and a vibration system, the vibration system includes a diaphragm and a voice coil connected together, and a magnetic gap is provided in the magnetic circuit system. As the power of the speaker increases, the voice coil generates a large amount of heat, which puts more strict requirements on the heat dissipation performance of the speaker, and the heat dissipation performance of the speaker system directly determines the reliability of the speaker.

Under long-time high strength operating condition, the unable quick heat dissipation in narrow and small space of high heat accumulation easy in the magnetic gap of voice coil loudspeaker voice coil output, along with the temperature can rise fast in the thermal accumulation magnetic gap, easily make the vibrating diaphragm be heated and warp, lead to speaker acoustic performance variation, glue between the voice coil loudspeaker voice coil line easily melts under the high temperature condition in addition leads to the adhesion stress to descend, and the voice coil loudspeaker voice coil is the line risk of easily appearing loosing, and in case the voice coil loudspeaker voice coil looses the line, speaker system will unable normal work.

Disclosure of Invention

It is an object of the present invention to provide a new solution for a loudspeaker.

According to a first aspect of the invention, a loudspeaker is provided. The loudspeaker comprises a shell, a magnetic circuit system and a vibration system, wherein a magnetic gap is formed in the magnetic circuit system, the vibration system comprises a vibrating diaphragm and a voice coil, the vibrating diaphragm is fixed on the shell, one end of the voice coil is connected to the vibrating diaphragm, the voice coil extends into the magnetic gap, and a first heat conduction layer is arranged on the inner surface of the magnetic gap.

Optionally, the magnetic circuit system includes a magnetic yoke, a central magnet and a central washer, the magnetic yoke includes a bottom plate and an upward side wall along the bottom plate, the central magnet and the central washer are sequentially fixed on the bottom plate of the magnetic yoke, a magnetic gap is formed between the side wall and the central magnet and the central washer, and the first heat conduction layer is arranged on the side surfaces of the central magnet and the central washer and on the inner surface of the magnetic yoke.

Optionally, the first heat conducting layer extends from the inner surface of the magnetic gap to the outer surface of the yoke until covering the entire outer surface of the yoke.

Optionally, a second heat conducting layer is provided on the inner surface of the housing.

Optionally, a portion of the first heat conducting layer covering the outer surface of the yoke side wall is in contact with the second heat conducting layer.

Optionally, the magnetic circuit system includes the yoke, fixes in proper order center magnet and center china department on the yoke, and fix in proper order limit magnet and limit china department on the yoke, the yoke is the magnetic conduction board, limit magnet and limit china department distribute around center magnet and center magnet, center china department with be formed with the magnetic gap between limit magnet, the limit china department, the side surface of center magnet, center china department and the internal surface of limit magnet, limit china department and yoke is provided with first heat-conducting layer.

Optionally, the first heat conduction layer extends from the inner surface of the magnetic gap to the outer surfaces of the rim washer, the rim magnet and the magnetic yoke until all the outer surfaces of the rim washer, the rim magnet and the magnetic yoke are covered.

Optionally, the side surface part of the first heat conduction layer covering the edge washer, the edge magnet and the yoke is in contact with the second heat conduction layer.

Optionally, the heat conducting layer is a silicone grease layer, and the silicone grease layer is equal in thickness and uniform in material.

The inventor of the invention finds that in the prior art, under the condition of long-time high-strength work of the loudspeaker, heat generated by the voice coil is easy to accumulate in a narrow magnetic gap space and cannot be quickly dissipated, the temperature in the magnetic gap space can be quickly increased along with the heat accumulation, the vibrating diaphragm is easy to be heated and deformed, glue among voice coil wires is easy to melt under the condition of high temperature, so that the bonding force is reduced, and the voice coil wires are easy to have the wire scattering risk.

Therefore, the technical task to be achieved or the technical problems to be solved by the present invention are never thought or anticipated by those skilled in the art, and therefore the present invention is a new technical solution.

According to the loudspeaker, the heat conducting layer is arranged on the inner surface of the magnetic gap, so that heat dissipation is effectively accelerated, and the phenomenon that the heat generated by the voice coil is accumulated in a narrow space of the magnetic gap to cause the heat distortion of the voice coil and the vibrating diaphragm is avoided.

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 sectional structural view of a speaker according to an embodiment of the present invention.

Fig. 2 is a sectional structure view of a speaker according to an embodiment of the present invention.

Fig. 3 is a sectional structural view of a speaker according to an embodiment of the present invention.

Fig. 4 is a sectional structural view of a speaker according to an embodiment of the present invention.

Wherein, 1: a housing; 2: a voice coil; 3: a central washer; 4, a central magnet; 5: vibrating diaphragm; 6: a border washer; 7: a side magnet; 8: a magnetic yoke; 9: a magnetic gap; 10: a first thermally conductive layer; 11: a magnetic yoke; 12: a first thermally conductive layer; 13: a second thermally conductive layer; 100: a lower housing; 101: an upper housing; 120: a portion of the first thermally conductive layer in contact with the second thermally conductive 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.

The invention provides a loudspeaker, as shown in fig. 1 and fig. 2, the loudspeaker comprises a shell 1, a magnetic circuit system and a vibration system, wherein the shell 1 comprises an upper shell 101 and a lower shell 100, a magnetic gap 9 is arranged in the magnetic circuit system, the vibration system comprises a vibrating diaphragm 5 and a voice coil 2, the vibrating diaphragm 5 is connected on the upper shell 101, one end of the voice coil 2 is connected on the vibrating diaphragm 5, the voice coil 2 extends into the space of the magnetic gap 9, so that most of the structure of the voice coil 2 is positioned in the space of the magnetic gap 9, and a first heat conduction layer 10 is arranged on the inner surface of the magnetic gap 9. After voice coil loudspeaker voice coil 2 circular telegram, voice coil loudspeaker voice coil 2 can vibrate under magnetic circuit's effect, because voice coil loudspeaker voice coil 2 is in the same place with 5 fixed connection of vibrating diaphragm, therefore voice coil loudspeaker voice coil 2 can drive vibrating diaphragm 5 and together vibrate to realize vibrating diaphragm 5's sound production, through at the setting of 9 internal surfaces in magnetic gap first heat-conducting layer 10, go out the heat that voice coil loudspeaker voice coil 2 produced fast transmission, avoid the heat accumulation that voice coil loudspeaker voice coil 2 produced in the narrow and small space in magnetic gap 9, make the high temperature in the magnetic gap space and lead to the voice coil loudspeaker voice coil to loose line and vibrating diaphragm thermal deformation.

In a preferred embodiment of the present invention, as shown in fig. 1, the magnetic circuit system includes a yoke 8, a center magnet 4 and a center washer 3, the yoke 8 includes a bottom plate and a side wall upward along the bottom plate, the bottom plate and the side wall of the yoke 8 together enclose a semi-enclosed structure with one end open, for example, as shown in fig. 1, the yoke 8 may include a bottom plate and a side wall protruding in a vertical direction along an edge of the bottom plate, the center magnet 4 and the center washer 3 are sequentially fixed on the bottom plate of the yoke 8, a magnetic gap 9 is formed between the side wall of the yoke 8 and the center magnet 4 and the center washer 3, and the first heat conducting layer 10 is disposed on a side surface of the center magnet 4 and the center washer 3 and an inner surface of the yoke 8.

Further preferably, as shown in fig. 3, the first heat conducting layer 10 extends from the inner surface of the magnetic gap 9 to the outer surface of the yoke 8 until completely covering the outer surface of the yoke 8, and finally forms a first heat conducting layer 12 covering the inner surface of the magnetic gap 9 and the outer surface of the yoke 8. The first heat conducting layer 12 connects the heat conducting layer on the inner surface of the magnetic gap 9 and the heat conducting layer on the outer surface of the magnetic yoke 8 to form an integral structure, which is beneficial to quickly conducting the heat generated by the voice coil 2 to the outer surface of the magnetic yoke 8.

In particular, as shown in fig. 3, a second heat conducting layer 13 is disposed on the inner surface of the housing 1, and a portion 120 of the first heat conducting layer 12 covering the outer surface of the side wall of the yoke 8 may be in contact with the second heat conducting layer 13. By the arrangement of the second heat conducting layer 13 and the second heat conducting layer 13 in contact with the first heat conducting layer 12, heat is facilitated to be quickly transferred from the first heat conducting layer 12 to the second heat conducting layer 13 and then to the outside of the housing 1.

In a specific embodiment of the present invention, as shown in fig. 3, a first heat conduction layer 12 of an integrated structure is disposed on the inner surface of the magnetic gap 9 and the outer surface of the yoke 8, a second heat conduction layer 13 is disposed on the inner surface of the housing 1, and the first heat conduction layer 12 is partially in contact with the second heat conduction layer 13. When the loudspeaker works, heat generated by the voice coil 2 is firstly transmitted to the outer surface of the magnetic yoke 8 with a large surface area through the first heat conduction layer 12, then the contact part of the first heat conduction layer 12 and the second heat conduction layer 13 is rapidly transmitted to the second heat conduction layer 13, and finally the heat is rapidly transmitted to the outside of the shell 1 through the second heat conduction layer 13, so that the heat accumulation is avoided, the emission of a magnetic circuit system of the loudspeaker is avoided, and the temperature of the whole magnetic circuit system is overhigh.

In another preferred embodiment of the present invention, as shown in fig. 2, the magnetic circuit system includes a magnetic yoke 11, a central magnet 4, a central washer 3, a side magnet 7 and a side washer 6, the magnetic yoke 11 is a magnetic conductive plate, the central magnet 4 and the central washer 3 are sequentially and fixedly disposed on the magnetic yoke 11, the side magnet 7 and the side washer 6 are disposed around the central magnet 4 and the central washer 3, a magnetic gap 9 is formed between the central magnet 4 and the central washer 3 and between the side magnet 7 and the side washer 6, and the first heat conductive layer 10 is disposed on the side surfaces of the central magnet 4 and the central washer 3 and on the inner surfaces of the side magnet 7, the side washer 6 and the magnetic yoke 11.

It is further preferable that, as shown in fig. 4, the first heat conduction layer 10 extends from the inner surface of the magnetic gap 9 to the outer surfaces of the side magnet 7, the side washer 6 and the yoke 11 until covering all the outer surfaces of the side magnet 7, the side washer 6 and the yoke 11, and finally forming a first heat conduction layer 12 in an integrated structure. The first heat conduction layer 12 can quickly conduct heat generated by the voice coil 2 to the outer surfaces of the side magnet 7, the side washer 6 and the yoke 11.

Specifically, as shown in fig. 4, a second heat conduction layer 13 is provided on the inner surface of the housing 1, and a side surface portion 120 of the first heat conduction layer 12 covering the edge washer 6, the edge magnet 7, and the yoke 11 is in contact with the second heat conduction layer 13. By the arrangement of the second heat conducting layer 13 and the second heat conducting layer 13 in contact with the first heat conducting layer 12, heat is advantageously quickly transferred from the first heat conducting layer 12 to the second heat conducting layer 13 and then to the outside of the housing 1.

In a specific embodiment of the present invention, as shown in fig. 4, a first heat conduction layer 12 is integrally disposed on the inner surface of the magnetic gap 9 and the outer surfaces of the side washer 6, the side magnet 7 and the yoke 11, a second heat conduction layer 13 is disposed on the inner surface of the housing 1, and the first heat conduction layer 12 is in partial contact with the second heat conduction layer 13. The heat that speaker during operation voice coil 2 produced transmits through first heat-conducting layer 12 extremely the surface of limit magnet 7, limit china department 6 and yoke 1, then through the heat-conducting layer that first heat-conducting layer 12 and second heat-conducting layer 13 part contacted fast transmission to second heat-conducting layer 13, transmits to the outside of casing 1 through second heat-conducting layer 13 at last, has realized thermal fast transmission, has avoided the heat accumulation can not give off fast at the magnetic circuit of speaker.

Preferably, the heat conducting layer arranged in the loudspeaker is a silicone grease layer, the silicone grease layer is equal in thickness and uniform in material, so that heat can be uniformly and quickly transferred between the heat conducting layers, and the silicone grease has good heat dissipation performance and cannot influence a magnetic field and electric waves.

Optionally, the upper casing 101 is made of a plastic material, the surface area of the upper casing 101 is large, the plastic material can ensure the lightness and thinness of the speaker, the lower casing 100 is a metal panel, the metal material is favorable for faster heat transfer, and the connection mode of the upper casing 101 and the lower casing 100 can be glue bonding, thread fastening and the like.

In the embodiment of the present invention, when the heat conducting layer on the inner surface 9 of the magnetic gap extends to the outer surface of the magnetic circuit system, the heat conducting layer is not disposed on a partial area of the surface of the magnetic circuit system to connect and fix the magnetic circuit system and the housing 1, the partial area may be in a long strip shape or other shapes, and the magnetic circuit system and the housing 1 may be bonded or otherwise connected, which is not limited in particular.

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 loudspeaker, characterized by: the magnetic circuit system is arranged in the shell and comprises a magnetic yoke, a central magnet and a central washer, the magnetic yoke comprises a bottom plate and a side wall which is upward along the bottom plate, the central magnet and the central washer are sequentially fixed on the bottom plate of the magnetic yoke, magnetic gaps are formed among the side wall, the central magnet and the central washer, and a first heat conduction layer is arranged on the side surfaces of the central magnet and the central washer and the inner surface of the magnetic yoke;

or the magnetic circuit system comprises a magnetic yoke, a central magnet and a central washer which are sequentially fixed on the magnetic yoke, and a side magnet and a side washer which are sequentially fixed on the magnetic yoke, wherein the magnetic yoke is a magnetic conduction plate, the side magnet and the side washer are distributed around the central magnet and the central magnet, magnetic gaps are formed among the central magnet and the central washer, the side magnet and the side washer, and first heat conduction layers are arranged on the side surfaces of the central magnet and the central washer and on the inner surfaces of the side magnet, the side washer and the magnetic yoke;

the vibration system comprises a vibrating diaphragm and a voice coil, the vibrating diaphragm is fixed on the shell, one end of the voice coil is connected to the vibrating diaphragm, and the voice coil extends into the magnetic gap;

the first heat conduction layer extends to the outer side surface of the magnetic yoke; the inner surface of the shell is provided with a second heat conduction layer; the middle portion of the first thermally conductive layer is in contact with the second thermally conductive layer.

2. The loudspeaker of claim 1, wherein: the first heat conducting layer extends from the inner surface of the magnetic gap to the outer surface of the magnetic yoke until the entire outer surface of the magnetic yoke is covered.

3. The loudspeaker of claim 2, wherein: the part of the first heat conduction layer covering the outer surface of the side wall of the magnetic yoke is in contact with the second heat conduction layer.

4. The loudspeaker of claim 1, wherein: the first heat conduction layer extends from the inner surface of the magnetic gap to the outer surfaces of the edge washer, the edge magnet and the magnetic yoke until all the outer surfaces of the edge washer, the edge magnet and the magnetic yoke are covered.

5. The loudspeaker of claim 4, wherein: the side surface parts of the first heat conduction layer, which cover the edge washer, the edge magnet and the magnetic yoke, are in contact with the second heat conduction layer.

6. The loudspeaker according to any one of claims 1 to 5, wherein: the heat conduction layer is a silicone grease layer, and the silicone grease layer is equal in thickness and uniform in material.