WO2018095033A1

WO2018095033A1 - Speaker unit and speaker module

Info

Publication number: WO2018095033A1
Application number: PCT/CN2017/090635
Authority: WO
Inventors: 刘岩涛
Original assignee: 歌尔股份有限公司
Priority date: 2016-11-22
Filing date: 2017-06-28
Publication date: 2018-05-31
Also published as: CN106535068A

Abstract

Disclosed is a speaker unit. The speaker unit comprises a vibration assembly and a magnetic circuit system, he magnetic circuit system comprising a magnet and a lower magnetic conduction plate, the lower magnetic conduction plate being made of a magnetic conduction foam metal, the magnet being fixedly arranged on the lower magnetic conduction plate, the vibration assembly comprising a voice coil and a diaphragm, the voice coil being fixedly connected to the diaphragm, and the voice coil being configured to be suspended in the magnetic circuit system. The technical problem solved by the invention is how to improve the heat dissipation performance of a speaker. The speaker unit of the invention can be applied to consumer electronics.

Description

Speaker unit and speaker module

Technical field

The invention belongs to the technical field of loudspeakers, and in particular to an improved loudspeaker unit and loudspeaker module.

Background technique

In the prior art, the speaker has become an indispensable electroacoustic transducer accessory in electronic products. With the development of consumer electronics, consumers have better performance requirements for speakers, hope to have a clearer sound when talking, or hope that electronic products play music is better. Those skilled in the art will improve the structure and materials of the speaker to meet better acoustic performance requirements.

In the existing speaker structure, there are at least the following defects or problems: 1. There are many internal parts of the speaker, and the vibration component is usually suspended between other components, so the speaker structure has poor impact resistance, if it is compared Large vibration or impact may cause damage and misalignment of parts, affecting the normal working performance of the speaker. 2. In order to ensure the balance of the air pressure on the upper and lower sides of the diaphragm in the speaker, it is necessary to open a vent hole on the lower magnetic plate due to the speaker. The structural limitation, the venting hole is difficult to process and is prone to blockage during use; 3. The assembly method of the magnetic circuit component in the speaker assembly is fixed by bonding, but the surface of the lower magnetic conductive plate is smooth, and the magnet The bonding strength of the components is poor, and the magnet is apt to fall off. 4. In order to improve the acoustic performance of the speaker and improve the resonant frequency, those skilled in the art can adopt a scheme of filling the sound absorbing material in the rear acoustic cavity of the single body or the module. Increase the virtual space of the rear cavity to improve the sound absorption performance, but the actual space limited by the rear cavity is limited. The improvement of the acoustic performance of the speaker is limited; 5. The heat generated by the speaker is severe during operation. If the heat is not obtained in time, the high temperature may cause damage to the vibration component.

In summary, for the structure and materials of the speaker, it is necessary to improve, at least solve One of the above technical problems, further, can comprehensively improve the performance and reliability of the speaker.

Summary of the invention

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

According to a first aspect of the present invention, there is provided a speaker unit comprising a vibration assembly and a magnetic circuit system, the magnetic circuit system comprising a magnet and a lower magnetic conductive plate, the lower magnetic conductive plate being made of a magnetically permeable metal foam The magnet is fixedly disposed on the lower magnetic conductive plate, the vibration component includes a voice coil and a diaphragm, and the voice coil is fixedly connected to the diaphragm, and the voice coil is configured to be suspended in the magnetic circuit system. .

Optionally, the speaker unit includes a housing having a receiving cavity, an edge of the diaphragm is fixed on the housing, the voice coil is located in the receiving cavity, and the magnetic circuit system is fixedly disposed on the In the accommodating chamber, a space between the magnetic circuit system and the diaphragm is a rear cavity, and a channel structure in the magnetic conductive foam metal of the lower magnetic plate serves as a vent hole of the rear cavity.

Optionally, the lower magnetically permeable plate is made of foamed steel or foamed nickel.

Optionally, the magnet comprises a central magnet, the lower magnetic conductive plate has a side wall, the central magnet is disposed inside the sidewall of the lower magnetic conductive plate, and the central magnet is formed between the central magnet and the sidewall There is a gap in which the voice coil is located.

Optionally, the magnet comprises a central magnet disposed at a central region of the lower magnetically permeable plate, and a side magnet disposed at an edge of the lower magnetically permeable plate, the central magnet A gap is formed with the side magnet, and the voice coil is located in the gap.

Optionally, the magnet and the lower magnetic conductive plate are adhesively fixed by an adhesive.

Optionally, the housing is made of porous ceramic.

Further, the present invention further provides a speaker module comprising a module housing and the speaker unit, wherein the speaker unit is disposed in the module housing.

The inventors of the present invention have found that, for the technical problems raised in the background art, those skilled in the art can adjust the structure of the speaker to a certain extent to prevent the speaker from a certain problem or some problems, thereby substantially reaching the standard. Claim. These adjustments are made, for example, by increasing the volume of the back cavity, increasing the area of the lower magnetic plate, and the like. Therefore, those skilled in the art do not consider designing a new technical solution to solve the above technical problems. Therefore, the present invention is to be realized The technical task or the technical problem to be solved is unexpected or unexpected by those skilled in the art, so the present invention is a new technical solution.

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

DRAWINGS

The accompanying drawings, which are incorporated in FIG

1 is a side cross-sectional view of a speaker unit provided by the present invention.

detailed description

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

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

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

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

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

The present invention provides a speaker unit that includes a vibrating assembly and a magnetic circuit system. As shown in FIG. 1, the magnetic circuit system includes a magnet and a lower magnetic conductive plate 12, and the magnet is fixedly disposed on the lower magnetic conductive plate 12, and the magnet, the lower magnetic conductive plate 12, and other magnetic circuit systems are constructed together. The magnetic field inside the speaker unit. The vibrating assembly includes a voice coil 21 and a diaphragm 22, and the voice coil 21 is fixedly coupled to the diaphragm 22, that is, the voice coil 21 is fixed to one side of the diaphragm 22. The voice coil 21 is configured to be suspended above the lower magnetically permeable plate 12 such that the voice coil 21 can be in a magnetic field generated by the magnetic circuit system. In particular, the lower magnetically permeable plate 12 is made of a magnetically permeable metal foam, and the use of a magnetically permeable metal foam for the lower magnetic permeable plate 12 enables the lower magnetically permeable plate 12 to have a good performance in many aspects.

First, the foam metal has a certain amount of pore structure, which makes the lower magnetic sheet have the ability to absorb shock and vibration. If the speaker unit or electronic product is subjected to a drop impact or impact, the lower magnetic sheet composed of the foam metal can absorb. A part of the vibrating assembly and the magnetic circuit system are subjected to the force to mitigate damage to the components and protect the speaker unit.

On the other hand, the vibration component of the speaker unit generates a large amount of heat during operation. If the heat dissipation performance of the monomer is poor, the internal high temperature may cause damage to the component. For example, the deformation performance of the diaphragm changes due to high temperature. , or the magnetic permeability of the magnetic circuit system is weakened in a high temperature environment. In the speaker unit provided by the present invention, the channel structure in the lower magnetic plate increases the surface area of the lower magnetic plate, and the channel structure also provides a better environment for air circulation to carry away the flowing air. The lower magnetic plate made of metal foam improves the overall heat dissipation performance of the speaker unit, so that the heat generated by the vibration component can be effectively diffused to the outside of the unit through the lower magnetic plate.

Further, the lower magnetic plate of the present invention also has a certain sound absorbing effect, and the channel structure can absorb sound vibration, thereby improving the acoustic performance of the speaker unit. If the speaker unit is disposed in the speaker module, the rear cavity area of the module can be used for sound absorption, bass sound improvement and the like, and the sound effect of the speaker module can be improved. In some cases, the space of the rear acoustic cavity of the module is limited, and the lower magnetic plate having a porous structure can compensate for the shortcoming of the space of the acoustic cavity behind the module.

In summary, in the speaker unit of the present invention, by improving the material and structure of the lower magnetic conductive plate, the performance of the speaker unit can be improved from various aspects, and the reliability and acoustic performance of the speaker unit can be comprehensively improved.

In a specific embodiment of the invention, the speaker unit includes a housing having a receiving cavity for carrying components of a speaker such as a vibrating assembly and a magnetic circuit system. Figure 1 As shown, the edge of the diaphragm 22 may be fixed to the housing 3, the voice coil 21 is located in the receiving cavity, and the magnetic circuit system is fixedly disposed in the receiving cavity, the magnetic circuit The space between the system and the diaphragm 22 is a rear cavity. Wherein, since the lower magnetic conductive plate 12 is made of magnetic conductive foam metal, the hole structure in the following magnetic conductive plate 12 can be used as a sound vent hole of the rear cavity, and the vibration of the diaphragm will cause the rear cavity when the speaker unit is working. In the change of the middle air pressure, the sound vent hole in the lower magnetic conductive plate 12 can supply air into and out of the rear cavity to balance the air pressure on both sides of the diaphragm. Through the design of the lower magnetic plate, it is not necessary to additionally provide a sound vent hole on the lower magnetic plate by machining, which saves the processing steps and reduces the processing difficulty of the lower magnetic plate. A person skilled in the art can change the porosity of the lower magnetic conductive plate by controlling the molding process of the lower magnetic conductive plate, thereby adjusting the size of the foam metal to meet the requirements of the sound leakage hole. The invention does not limit whether the speaker unit has a housing. In other embodiments, the speaker unit can also be directly disposed in the outer casing of the module and fixed by the module housing. The lower magnetically permeable plate can also perform the above functions.

The lower magnetic plate of the present invention is used for a magnetic circuit system, so the selected metal foam material needs to have magnetic permeability. Alternatively, the lower magnetically permeable plate may be made of foamed steel or foamed nickel, both of which have good magnetic permeability. The present invention does not specifically limit the metal foam material, and other materials may be selected in addition to the above two materials.

For the magnetic circuit system of the speaker unit, the following two feasible specific solutions are given by the present invention, and other specific manners may be adopted by those skilled in the art, which are not limited by the present invention. In one embodiment, the magnet includes a center magnet, and the lower magnetically conductive plate has a side wall, and the center magnet is disposed inside a space surrounded by a side wall of the lower magnetic conductive plate. A gap is formed between the side wall of the lower magnetic plate and the center magnet. The voice coil is located in the gap. In the working state, the voice coil generates a large amount of heat, and the heat can be directly transmitted to the side wall of the lower magnetic conductive plate, and is lost to the speaker unit through the lower magnetic conductive plate as soon as possible.

In another embodiment, as shown in FIG. 1, the magnet may include a center magnet 111 and a side magnet 112, the lower magnetic plate 12 having only a bottom plate portion and no side walls. The center magnet 111 is disposed at a central portion of the lower magnetic conductive plate 12, and the side magnet 112 is disposed at an edge of the lower magnetic conductive plate 12 to form between the central magnet 111 and the side magnet 112. With the gap 13, the center magnet 111 and the side magnet 112 can generate a stronger magnetic field. The sound A ring 21 is located in the gap 13. In the operating state, heat generated by the voice coil 21 is transmitted to the lower magnetic conductive plate 12 through the center magnet 111 and the side magnet 112, or directly from the inside of the gap 13 to the lower magnetic conductive plate 12.

Optionally, in an embodiment, the magnet may be fixedly connected to the lower magnetic plate by bonding. Bonding is usually achieved by an adhesive which has the drawbacks as described in the background. However, since the lower magnetic conductive plate of the present invention is made of a foamed metal material, the surface of the magnetic conductive plate below is an uneven surface, which contributes to the improvement of the adhesion of the adhesive, and can more firmly guide the lower guide. The magnetic plate is bonded to the magnet to improve structural reliability. In other embodiments, the magnet may be fixedly connected to the lower magnetic plate by a process such as soldering, which is not limited in the present invention.

Further, in an embodiment in which the speaker unit includes a housing, the housing may be made of porous ceramic, so that the housing can also better absorb shock, heat dissipation, etc., further Strengthen the structural reliability of the speaker unit.

In another aspect, the present invention further provides a speaker module, comprising: a module housing and the speaker unit, wherein the speaker unit is disposed in the module housing, and is made of a magnetic conductive metal foam. The finished lower magnetic plate can play the role of sound absorption and heat dissipation in the speaker module, and effectively improve the acoustic performance and reliability of the speaker module.

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

Claims

A speaker unit, comprising a vibration assembly and a magnetic circuit system, the magnetic circuit system comprising a magnet and a lower magnetic plate (12), the lower magnetic plate (12) being made of a magnetically permeable metal foam The magnet is fixedly disposed on the lower magnetic conductive plate (12), and the vibration component comprises a voice coil (21) and a diaphragm (22), and the voice coil (21) is fixedly connected with the diaphragm (22) The voice coil (21) is configured to be suspended in the magnetic circuit system.
A loudspeaker unit according to claim 1, wherein said loudspeaker unit comprises a housing (3) having a receiving chamber, the edge of said diaphragm (22) being fixed to said housing (3) The voice coil (21) is located in the accommodating cavity, the magnetic circuit system is fixedly disposed in the accommodating cavity, and a space between the magnetic circuit system and the diaphragm is a rear cavity, the lower The pore structure in the magnetically permeable foam metal of the magnetic conductive plate (12) serves as a sound venting hole of the rear cavity.
A loudspeaker unit according to claim 1 or 2, characterized in that the lower magnetically permeable plate (12) is made of foamed steel or nickel foam.
A speaker unit according to any one of claims 1 to 3, wherein said magnet comprises a center magnet (111), said lower magnetic plate (12) has a side wall, said central magnet (111) Provided inside the sidewall of the lower magnetic conductive plate (12), a gap (13) is formed between the central magnet (111) and the sidewall, and the voice coil (21) is located in the gap (13) )in.
The speaker unit according to any one of claims 1 to 4, wherein the magnet comprises a center magnet (111) and a side magnet (112), and the center magnet (111) is disposed at the lower magnetic field. a central portion of the plate (12), the side magnet (112) is disposed at an edge of the lower magnetic conductive plate (12), and a gap is formed between the central magnet (111) and the side magnet (112) (13), the voice coil (21) is located in the gap (13).
The speaker unit according to any one of claims 1 to 5, wherein the magnet and the lower magnetic conductive plate (12) are bonded and fixed by an adhesive.
The loudspeaker unit according to any one of claims 1 to 6, characterized in that the casing (3) is made of porous ceramic.
A speaker module, comprising: a module housing and the speaker unit according to any one of claims 1-7, wherein the speaker unit is disposed in the module housing.