CN211557474U

CN211557474U - Sound production device and electronic equipment

Info

Publication number: CN211557474U
Application number: CN202020321002.1U
Authority: CN
Inventors: 翟成祥; 郭翔
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-09-22
Anticipated expiration: 2030-03-13

Abstract

The utility model discloses a sound generating mechanism and electronic equipment. The sound generating device comprises a magnetic circuit system and a vibration system; the vibration system comprises a vibrating diaphragm and a voice coil; the magnetic circuit system is provided with a magnetic gap for accommodating a voice coil, wherein a composite heat dissipation layer is attached to the surface of the magnetic circuit system, the composite heat dissipation layer comprises a metal material layer and a nano carbon material layer adhered to the first side surface of the metal material layer, the second side surface of the metal material layer is attached to the magnetic circuit system, and the heat conduction coefficient of the metal material layer is higher than that of the magnetic circuit system part corresponding to the metal material layer. The utility model has the advantages of a good heat dissipation, cooling effect can be realized to the sound generating mechanism in operation to the technological effect of the utility model.

Description

Sound production device and electronic equipment

Technical Field

The utility model relates to an acoustics device technical field, more specifically, the utility model relates to a sound generating mechanism and electronic equipment.

Background

With the increasing demands for quality of life, high-quality music enjoyment is becoming popular, and thus, sound generating devices for playing audio are widely used in smart mobile devices such as smart phones, tablet computers, notebook computers, and various smart wearing devices. The sound generating device is a transducer capable of converting an electrical signal into an acoustic signal, and the acoustic performance and reliability of the sound generating device are particularly important.

Nowadays, with the rapid development of smart phones, the application scenarios of smart phones are more and more extensive, and the requirements of users on various aspects of the smart phones are also higher and higher. When the mobile phone is used, whether playing games, watching videos or listening to music, high-quality sound effects are generally required, which puts higher requirements on the sound generating device applied to the intelligent mobile phone. Not only is the loudness of the sound generating device required to be high, but also the sound generating device is required to have good tone quality effect. However, high loudness of sound emitting devices is often accompanied by high power. In the conventional sound generating device, the power of the sound generating device is improved to about 1W at present, but the sound efficiency of the sound generating device is relatively low, and most of input power is converted into heat. In fact, inside the sound generating device, the temperature resistance of many parts is not good, and the temperature which can be endured is about 110 ℃. In order to prevent the components inside the sound generating device from being damaged or damaged due to high temperature, the temperature of the sound generating device is generally limited and protected. However, the existing protection schemes generally have two disadvantages: (1) the acoustic performance of the sound emitting device is limited, so that the maximum loudness thereof cannot be exerted. (2) The protection effect is not ideal, and the voice coil, which is the heat source, is easily burnt.

Therefore, it is necessary to develop a new technology to solve the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of sound generating mechanism and electronic equipment.

According to the utility model discloses an aspect provides a sound generating mechanism. The sound generating device comprises a magnetic circuit system and a vibration system;

the vibration system comprises a vibrating diaphragm and a voice coil;

the magnetic circuit system is provided with a magnetic gap for accommodating a voice coil, wherein a composite heat dissipation layer is attached to the surface of the magnetic circuit system, the composite heat dissipation layer comprises a metal material layer and a nano carbon material layer adhered to the first side surface of the metal material layer, the second side surface of the metal material layer is attached to the magnetic circuit system, and the heat conduction coefficient of the metal material layer is higher than that of the magnetic circuit system part corresponding to the metal material layer.

Optionally, the magnetic circuit system includes a magnetic yoke, a magnet disposed on the magnetic yoke, and a magnetic conductive plate disposed on a side of the magnet away from the magnetic yoke, and the composite heat dissipation layer is attached to a side of the magnetic conductive plate facing the diaphragm.

Optionally, the magnetic circuit system includes a central magnet disposed at a central position of the magnetic yoke and a central magnetic conductive plate disposed on a side of the central magnet away from the magnetic yoke, and the composite heat dissipation layer is attached to a side of the central magnetic conductive plate facing the diaphragm.

Optionally, the magnetic circuit system includes a magnetic yoke, a magnet disposed on the magnetic yoke, and a magnetic conductive plate disposed on a side of the magnet away from the magnetic yoke, and the composite heat dissipation layer is attached to a side of the magnetic yoke away from the magnet.

Optionally, a concave region is formed on a surface of the magnetic yoke on a side away from the magnet, and the composite heat dissipation layer is embedded in the concave region.

Optionally, the composite heat dissipation layer and the magnetic circuit system are bonded together by glue.

Optionally, the metal material layer is a copper foil layer or an aluminum foil layer.

Optionally, the thickness of the metallic material layer is 0.005-0.2 mm.

Optionally, the thickness of the layer of nanocarbon material is 0.003-0.02 mm.

According to a second aspect of the present invention, an electronic device is provided. The electronic equipment comprises the sound generating device.

The embodiment of the utility model provides a sound generating mechanism improves to the magnetic circuit part wherein, has set up the good compound heat dissipation layer of heat dispersion specially for magnetic circuit's surface to make sound generating mechanism can have good radiating effect under operating condition, can not cause the high temperature and then burn to inside spare part because of being in long-term operating condition, help prolonging whole sound generating mechanism's life. Meanwhile, the acoustic performance of the sound generating device can be properly improved, and the sound generating device has the characteristics of high loudness and good sound quality effect. The technical task to be achieved or the technical problems to be solved by the present invention are never thought or not expected by the skilled in the art, so 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 of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the 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 conventional sound emitting device.

Fig. 2 is a schematic structural diagram of a composite heat dissipation layer according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a sound generator according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of a sound generator according to another embodiment of the present invention.

Fig. 5 is a graph showing a temperature rise of a conventional yoke and a magnetic circuit system provided with a composite heat dissipation layer.

Description of reference numerals:

1-magnetic yoke, 2-magnet, 201-central magnet, 3-voice coil, 4-composite heat dissipation layer, 41-metal material layer, 42-nano carbon material layer, 5-vibrating diaphragm, 6-magnetic gap, 7-magnetic conduction plate and 701-central magnetic conduction plate.

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: unless specifically stated otherwise, 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.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

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

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to an embodiment of the present invention, a sound generating apparatus is provided. The sound production device can be applied to various types of electronic products such as mobile phones, notebook computers, tablet computers, VR equipment, AR equipment, navigators and intelligent wearable equipment, and is relatively wide in application. The embodiment of the utility model provides a sound generating mechanism has good heat dispersion, can not lead to the high temperature of self because of long-term the use.

The following further describes a specific structure of the sound generating device provided in the embodiments of the present invention.

The embodiment of the utility model provides a sound generating mechanism, as shown in fig. 3 and fig. 4, it includes magnetic circuit system and vibration system. The vibration system comprises a diaphragm 5 and a voice coil 3. The magnetic circuit system is provided with a magnetic gap 6 for accommodating the voice coil 3, wherein a composite heat dissipation layer 4 is attached to the surface of the magnetic circuit system, the composite heat dissipation layer 4 comprises a metal material layer 41 and a nano carbon material layer 42 adhered to the first side surface of the metal material layer 41, the second side surface of the metal material layer 41 is attached to the magnetic circuit system, and the heat conduction coefficient of the metal material layer 41 is higher than that of the magnetic circuit system part corresponding to the metal material layer 41.

Furthermore, the embodiment of the utility model provides a sound generating device, it can also be including the device shell, and the inside of device shell is formed with corresponding chamber that holds. The magnetic circuit system and the vibration system are accommodated and fixed in the accommodating cavity together.

In fact, when the sound generating device is in an operating state, as shown in fig. 1, the voice coil 3 in the vibration system as a heat source generates a large amount of heat, and the heat is transferred to the magnetic circuit portion, and then the magnetic circuit portion dissipates the heat into the air, so as to achieve heat dissipation and cooling of the whole sound generating device. However, in the conventional sound generating device, the magnetic circuit system is mostly poor in heat dissipation effect due to the influence of factors such as material, and heat generated in the sound generating device cannot be dissipated to the air quickly and timely, so that the temperature in the sound generating device is increased.

The embodiment of the utility model provides a sound generating mechanism improves to magnetic circuit's wherein structure, has set up compound heat dissipation layer 4 on magnetic circuit's the surface specially. The composite heat dissipation layer 4 is different from a conventional heat dissipation layer and comprises a metal material layer 41 and a nano-carbon material layer 42, wherein the heat conduction coefficient of the metal material layer 41 is higher than that of the magnetic circuit system part corresponding to the metal material layer 41. Therefore, the composite heat dissipation layer 4 has better heat conduction performance and heat dissipation effect.

When the sound generating device is in a working state, the heat generated by the voice coil 3 can be transmitted to the magnetic circuit system part, and the composite heat dissipation layer 4 is arranged on the magnetic circuit system in advance, so that the magnetic circuit system has good heat dissipation capacity, and the heat in the sound generating device can be quickly and timely conducted to the outside and dissipated into the air.

The embodiment of the utility model provides a sound generating mechanism has good radiating effect, can not lead to the phenomenon that the inside high temperature of sound generating mechanism burns inside spare part because of being in long-term operating condition. Meanwhile, the utility model discloses in can also effectively improve sound generating mechanism's acoustic performance to make sound generating mechanism have the characteristics that the loudness is big and tone quality is effectual.

As shown in fig. 2, the composite heat dissipation layer 4 includes a metal material layer 41 and a nano-carbon material layer 42 which are stacked. Further, the nano-carbon material layer 42 is disposed on the first side surface of the metal material 41 layer. The metal material layer 41 has a good thermal conductivity, and the nanocarbon material layer 42 has a strong heat radiation capability. The two are reasonably combined, so that the formed composite heat dissipation layer 4 has high heat dissipation efficiency and good heat dissipation effect.

For the composite heat dissipation layer 4, the metal material layer 41 and the nanocarbon material layer 42 can be bonded together by using a special adhesive, for example, and the nanocarbon material layer 42 is bonded to the surface of the metal material layer 41 by a coating process, so that the two can be simply and firmly bonded together to form an integral structure. Of course, other fastening means known to those skilled in the art may be used in addition to the above-described adhesive bonding, and the present invention is not limited thereto.

In an embodiment of the present invention, the metal material layer 41 may be made of a copper foil material, for example, to form a copper foil layer. The metal material layer 41 may also be made of an aluminum foil material to form an aluminum foil layer. The copper foil material and the aluminum foil material both have good heat conduction effects.

For example, the composite heat sink layer 4 includes a copper foil layer and a nanocarbon material layer fixedly bonded together to form a nanocarbon copper layer. As another example, the composite heat sink layer 4 includes an aluminum foil layer and a nanocarbon material layer fixedly bonded together to form a nanocarbon aluminum layer. The utility model provides an in the embodiment, through set up nanometer carbon copper layer or nanometer carbon aluminium lamination on magnetic circuit's the surface, can obviously promote magnetic circuit's radiating efficiency and effect, and then reduce the temperature of whole sound generating mechanism under operating condition, avoid sound generating mechanism the condition of high temperature to appear.

For a conventional yoke, the material is usually SPCC material. The heat transfer coefficient of the SPCC material is about 80W/mk. The copper foil material has a thermal conductivity of about 429W/mk, and the aluminum foil material has a thermal conductivity of about 237W/mk. The comparison of the heat conduction coefficients shows that: the heat conduction capacity of the copper foil material and the aluminum foil material is far higher than that of the SPCC material, and in addition, the nano carbon material layer 42 has stronger heat radiation capacity, so that the heat radiation capacity of the magnetic circuit system can be well improved.

The embodiment of the utility model provides a sound generating mechanism sets up compound heat dissipation layer 4 on magnetic circuit and can adopt the form of multiple difference. For example, the composite heat dissipation layer 4 is provided on the magnetic conductive plate 7 of the magnetic circuit system, or the composite heat dissipation layer 4 is provided on the yoke 1 of the magnetic circuit system, and each will be described below with reference to specific embodiments.

In a specific embodiment of the present invention, as shown in fig. 1, the magnetic circuit system includes a magnetic yoke 1, a magnet 2 disposed on the magnetic yoke 1 and a magnetic conductive plate 7 disposed on one side of the magnetic yoke 1, the composite heat dissipation layer 4 is attached to the magnetic conductive plate 7 toward one side of the vibrating diaphragm 5 (the composite heat dissipation layer 4 is not shown in fig. 1). The method for arranging the composite heat dissipation layer 4 is simple and easy to realize, and only the composite heat dissipation layer 4 is bonded with the magnetic conduction plate 7. However, it should be noted that in this way, the thickness of the magnetic conductive plate 7 is likely to be increased, and therefore, the composite heat dissipation layer 4 can be designed to be as thin as possible. For example, the thickness of the composite heat dissipation layer 4 can be controlled to be about 0.05mm, for example. In addition, when the composite heat dissipation layer 4 is connected with the surface of the magnetic conduction plate 7, the metal material layer 41 in the composite heat dissipation layer 4 needs to directly face the surface of the magnetic conduction plate 7 and be bonded with the surface of the magnetic conduction plate 7.

In addition, under the structure of the above embodiment, the composite heat dissipation layer 4 may also adopt another arrangement mode. As shown in fig. 1, the magnetic circuit system includes a central magnet 201 disposed at a central position of the magnetic yoke 1 and a central magnetic conductive plate 701 disposed at a side of the central magnet 201 away from the magnetic yoke 1, and the composite heat dissipation layer 4 is attached to a side of the central magnetic conductive plate 701 facing the diaphragm 5. That is to say, the composite heat dissipation layer 4 may be disposed only on a part of the magnetic conductive plate 7, that is, the central magnetic conductive plate 701, and this way of disposing the composite heat dissipation layer 4 locally may also achieve a better heat dissipation effect.

The technical personnel in the field can be according to actual need, and the flexibility is selected and is set up compound heat dissipation layer 4 on the part of magnetic conduction board 7 or whole magnetic conduction board 7, the utility model discloses do not do the restriction to this.

In the design, the composite heat dissipation layer 4 is attached to the cavity formed by the diaphragm and the magnetic circuit system in a surrounding manner and is positioned on the inner surface of the magnetic circuit system. Attached compound heat dissipation layer 4 on magnetic circuit's internal surface, when sound generating mechanism is in operating condition, the heat that voice coil loudspeaker voice coil 3 produced can be given for compound heat dissipation layer 4 earlier and then give magnetic circuit, conduct the heat to the outside air by magnetic circuit again, it is concrete, because 41 heat-conduction coefficient of metallic material layer in the compound heat dissipation layer 4 is higher, and the nanocarbon material layer has high specific surface area and high thermal radiation nature, the nanocarbon material layer can be more efficient with the heat absorption of voice coil loudspeaker voice coil production again by metallic material layer conduct magnetic circuit fast, and then magnetic circuit's heat-sinking capability has been improved.

In another embodiment of the present invention, as shown in fig. 3, the magnetic circuit system includes a magnetic yoke 1, a magnet 2 disposed on the magnetic yoke 1 and a magnetic conductive plate 7 disposed on one side of the magnetic yoke 1, and the composite heat dissipation layer 4 is attached to the magnetic yoke 1 and kept away from one side of the magnet 2. The way of arranging the composite heat dissipation layer 4 is also simpler, and only the composite heat dissipation layer 4 needs to be bonded with the surface of the magnetic yoke 1. It should also be noted that in this manner, however, it is highly likely that the thickness of the yoke 1 will increase, and therefore, the composite heat dissipation layer 4 may be designed to be as thin as possible. For example, the thickness of the composite heat dissipation layer 4 can be controlled to be about 0.05mm, for example. In addition, when the composite heat dissipation layer 4 is attached to the surface of the yoke 1, the metal material layer 41 in the composite heat dissipation layer 4 is directly faced to the surface of the yoke 1 and is bonded to the surface of the yoke 1.

In another embodiment of the present invention, as shown in fig. 4, the magnetic circuit system includes a magnetic yoke 1, a magnet 2 disposed on the magnetic yoke 1 and a magnetic conductive plate 7 disposed on one side of the magnetic yoke 1, the magnetic yoke 1 is kept away from the magnetic magnet 2, a concave region is formed on the surface of one side of the magnet 2, and the composite heat dissipation layer 4 is embedded in the concave region. The area of the recessed region may be close to the area of the surface of the yoke 1, or may be smaller as appropriate. The composite heat dissipation layer 4 is arranged in the concave area of the surface of the magnetic yoke 1 in an embedded mode, and the adoption of the mode of arranging the composite heat dissipation layer 4 does not occupy the space of the magnetic yoke 1 in the thickness direction, so that the thickness of the magnetic yoke 1 is not increased. In the present embodiment, the metal material layer 41 in the composite heat dissipation layer 4 is also directly faced to the surface of the yoke 1 and is bonded to the surface of the yoke 1.

Note that the composite heat dissipation layer 4 may be provided on one surface of the yoke 1, or may be provided on each surface of the yoke 1. The person skilled in the art can flexibly adjust the device according to the needs, without limitation.

In the design, the composite heat dissipation layer 4 is attached outside a cavity formed by enclosing the diaphragm and the magnetic circuit system and is positioned on the outer surface of the magnetic circuit system. Attached compound heat dissipation layer 4 on magnetic circuit's surface, when sound generating mechanism is in operating condition, the heat that voice coil loudspeaker voice coil 3 produced can be given magnetic circuit earlier and then be transmitted to compound heat dissipation layer 4, conduct the heat to the outside air by compound heat dissipation layer 4, and is concrete, because 41 heat-conduction coefficient of metallic material layer in the compound heat dissipation layer 4 are higher, and the nanocarbon material layer has high specific surface area and high thermal radiation nature, can transmit the nanocarbon material layer via metallic material layer behind the heat transfer that the voice coil loudspeaker voice coil produced to magnetic circuit fast, radiate in the external environment by the nanocarbon material layer high efficiency at last, and then improved magnetic circuit's heat-sinking capability.

In the embodiment of the present invention, the composite heat dissipation layer 4 is mainly composed of the metal material layer 41 and the nanocarbon material layer 42. The thicknesses of the metal material layer 41 and the nanocarbon material layer 42 should be reasonably controlled to avoid that the composite heat dissipation layer 4 is too thick, which results in too large dimension of the whole magnetic circuit part in the thickness direction, which is not beneficial to assembly, and may eventually result in increase of the size of the sound generating device.

Optionally, the thickness of the metallic material layer 41 ranges from 0.005mm to 0.2 mm. For example, the copper foil layer has a thickness in the range of 0.005mm to 0.2 mm. Also for example, the aluminum foil layer has a thickness in the range of 0.005mm to 0.2 mm.

Optionally, the thickness of the nanocarbon material layer 42 ranges from 0.003mm to 0.02 mm. The thickness of the nano carbon material layer 42 is controlled to be 0.005mm, and then the nano carbon material layer is matched with a copper foil layer with the thickness of 0.03mm to be made into nano carbon copper, and the temperature is about 5 ℃ lower than that of a conventional magnetic circuit system in a normal working state.

It should be noted that, in a specific application, a person skilled in the art can flexibly adjust the thicknesses of the metal material layer 41 and the nanocarbon material layer 42 according to specific needs to reasonably control the thickness of the entire composite heat dissipation layer 4, which is not limited in this respect.

In the embodiment of the present invention, when combining the composite heat dissipation layer 4 with the magnetic circuit system, in order to firmly combine the two together, for example, an adhesive may be used to bond the two together. In an optional example of the present invention, a back adhesive is provided on the second side surface of the metal material layer 41 of the composite heat dissipation layer 4 in advance, and the second side surface of the metal material layer 41 is directly bonded to the magnetic circuit system portion.

As shown in fig. 5, two sets of contrast curves are shown. Specifically, the method comprises the following steps:

the curve a and the curve c correspond to a magnetic circuit system of the same product, the curve a is a temperature rise curve of the magnetic circuit system without the nano carbon copper layer, the curve c is a temperature rise curve of the magnetic circuit system with the nano carbon copper layer, and the curve c is obviously lower than the curve a by comparison. That is to say, the magnetic circuit system provided with the nano carbon copper layer has a low temperature and a good heat dissipation effect.

The curve b and the curve d correspond to a magnetic circuit system of another product, the curve b is a temperature rise curve of the magnetic circuit system without the nano carbon copper layer, the curve d is a temperature rise curve of the magnetic circuit system with the nano carbon copper layer, and the curve d is obviously lower than the curve b by comparison. That is to say, the magnetic circuit system provided with the nano carbon copper layer has a low temperature and a good heat dissipation effect.

Two groups of comparisons show that the magnetic circuit system provided with the composite heat dissipation layer really has a good heat dissipation effect.

The embodiment of the utility model provides a sound generating mechanism, voice coil loudspeaker voice coil 3 wherein can avoid appearing voice coil loudspeaker voice coil 3 by the phenomenon of burning circle through the quick, timely discharge of magnetic circuit part as main heat source, the heat of its production, can improve the life of voice coil loudspeaker voice coil.

According to the utility model discloses a second aspect still provides an electronic equipment. The electronic equipment comprises the sound generating device.

Electronic equipment can be cell-phone, notebook computer, panel computer, VR equipment, intelligent wearing equipment etc. for example, the utility model discloses do not do the restriction to this.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A sound generating device, characterized by: comprises a magnetic circuit system and a vibration system;

the vibration system comprises a vibrating diaphragm and a voice coil;

2. The sound generating apparatus of claim 1, wherein: the magnetic circuit system comprises a magnetic yoke, a magnet arranged on the magnetic yoke and a magnetic conduction plate arranged on one side of the magnet far away from the magnetic yoke, and the composite heat dissipation layer is attached to one side of the magnetic conduction plate, which faces the vibrating diaphragm.

3. The sound generating apparatus of claim 2, wherein: the magnetic circuit system comprises a central magnet arranged at the central position of the magnet yoke and a central magnetic conduction plate arranged on one side of the central magnet far away from the magnet yoke, and the composite heat dissipation layer is attached to one side of the central magnetic conduction plate, which faces the vibrating diaphragm.

4. The sound generating apparatus of claim 1, wherein: the magnetic circuit system comprises a magnetic yoke, a magnet arranged on the magnetic yoke and a magnetic conduction plate arranged on one side of the magnet far away from the magnetic yoke, and the composite heat dissipation layer is attached to one side of the magnetic yoke far away from the magnet.

5. The sound generating apparatus of claim 4, wherein: a concave area is formed on the surface of one side, far away from the magnet, of the magnetic yoke, and the composite heat dissipation layer is embedded in the concave area.

6. The sound generating apparatus of claim 1, wherein: the composite heat dissipation layer and the magnetic circuit system are bonded together by glue.

7. The sound generating apparatus of claim 1, wherein: the metal material layer is a copper foil layer or an aluminum foil layer.

8. The sound generating apparatus of claim 1, wherein: the thickness of the metal material layer is 0.005-0.2 mm.

9. The sound generating apparatus of claim 1, wherein: the thickness of the nano carbon material layer is 0.003-0.02 mm.

10. An electronic device, characterized in that: comprising a sound emitting device according to any of claims 1-9.