CN213213849U

CN213213849U - Sound production device and electronic equipment

Info

Publication number: CN213213849U
Application number: CN202022133822.0U
Authority: CN
Inventors: 周树芝
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-05-14
Anticipated expiration: 2030-09-25

Abstract

The utility model discloses a sound generating mechanism includes vibration system and magnetic circuit. The vibration system comprises a diaphragm and a voice coil connected to the diaphragm, and the magnetic circuit system is used for driving the vibration system. The vibrating diaphragm comprises a vibrating plate and a bending ring part arranged around the vibrating plate, the vibrating plate comprises a body part and a central part protruding from the body part, and the central part is integrally formed on one side of the body part facing the magnetic circuit system; the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part, wherein the central magnetic circuit part and the side magnetic circuit part are fixed on the magnetic yoke; the coverage area of the opening of the groove projected on the diaphragm includes the area of the central part. The utility model provides a sound generating mechanism has improved the high frequency resonance state, has promoted the high frequency audio, is favorable to electronic equipment's miniaturization, portable design simultaneously.

Description

Sound production device and electronic equipment

Technical Field

The utility model relates to an electroacoustic conversion technology field, in particular to sound generating mechanism and electronic equipment.

Background

With the social and economic development and the consumer upgrade, consumers put higher requirements on the sound quality of electronic equipment, which requires more space for the sound cavity design of the sound generating device, but contradictory to each other, the consumer has higher and higher requirements on the portability of some electronic equipment, the expansion of the sound cavity space is limited, and even further space compression is required.

But sound generating mechanism's vibration board is mostly flat board at present, and the intensity of vibration board is relatively poor, and frequency division vibration frequency point is lower, and high frequency tone quality is relatively poor, and the total harmonic distortion corresponds the spike higher. Simply increasing the thickness of the vibrating plate increases the overall height of the sound generating device, which is not conducive to the miniaturization and portability of electronic devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide a sound generating mechanism.

In order to achieve the above object, the utility model provides a sound generating device, this sound generating device includes:

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

a magnetic circuit system for driving the vibration system;

the vibrating diaphragm comprises a vibrating plate and a bending ring part arranged around the vibrating plate, the vibrating plate comprises a body part and a central part protruding from the body part, and the central part is integrally formed on one side of the body part facing the magnetic circuit system;

the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit part and a side magnetic circuit part, wherein the central magnetic circuit part and the side magnetic circuit part are fixed on the magnetic yoke;

the coverage area of the opening of the groove projected on the diaphragm includes the area of the central part.

Optionally, the central portion and the body portion are integrally formed by machining or injection molding.

Optionally, the material of the vibrating plate includes at least one of aluminum, aluminum alloy, carbon fiber, PET, PEN, PI foam material, and PMI foam material.

Optionally, the shape of the central portion is one of a cuboid, a cylinder, a truncated pyramid, and a circular truncated cone.

Optionally, the central portion has a chamfer or fillet.

Optionally, the central portion occupies 5% to 99% of the total area of the surface of the vibration plate facing the magnetic circuit system.

Optionally, the height of the central portion is between 0.01mm-3 mm.

Optionally, the central magnetic circuit portion includes a central magnet and a central magnetic conductive plate covering the central magnet, and the groove is opened in the central magnetic conductive plate or penetrates through the central magnetic conductive plate and is opened in the central magnet.

Optionally, the depth of the groove is between 0.01mm and 5 mm.

The utility model also provides an electronic equipment, include as above sound generating mechanism.

In the utility model, the central part which is integrally formed with the vibrating plate of the sound generating device is arranged on one side of the vibrating plate facing to the magnetic circuit system, thereby saving the assembly process and reducing the process complexity; a groove for avoiding the central part is formed in the position, corresponding to the central part, of the central magnetic conduction plate, so that the acoustic performance is prevented from being influenced by collision in the vibration process. Under the condition that the overall height of the sound generating device is not increased, the thickness of the center of the vibration plate is increased, the overall strength of the vibration plate is enhanced, the high-frequency resonance state of the sound generating device is improved, the high-frequency sound effect of the sound generating device is improved, and the miniaturization and portability design of electronic equipment is facilitated.

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 diagram of a sound generating device according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a sound generating device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram comparing the total harmonic distortion test curve of the sound generating device of the present invention and the sound generating device of the prior art.

Description of reference numerals:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Sound producing device	13	Magnetic circuit system
11	Outer casing	131	Magnetic yoke
				12	Vibration system	132	Central magnetic circuit part
121	Vibrating diaphragm	1321	Center magnet
				1211	Vibrating plate	1322	Central magnetic conduction plate
1211a	Body part	1322a	Groove
				1211b	Center part	133	Side magnetic circuit part
1212	Folded ring part	1331	Edge magnet
				122	Voice coil	1332	Edge 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.

In the embodiment of the present invention, please refer to fig. 1 to fig. 2 in combination, the sound generating device 1 includes a vibration system 12 and a magnetic circuit system 13. Wherein, the vibration system 12 includes a diaphragm 121 and a voice coil 122 connected to the diaphragm 121, and the magnetic circuit system 13 is used for driving the vibration system 12 to vibrate and generate sound. In the present invention, the sound generating device 1 further includes a housing 11 for accommodating the vibration system 12 and the magnetic circuit system 13, and in other embodiments, the sound generating device 1 may not be provided with the specific housing 11, and the function thereof is realized by the partial assembly of the magnetic circuit system 13. In the vibration system 12, the diaphragm 121 includes a vibration plate 1211 and a corrugated portion 1212 surrounding the vibration plate 1211, the vibration plate 1211 includes a body portion 1211a and a central portion 1211b protruding from the body portion 1211a, the central portion 1211b is integrally formed on a side of the body portion 1211a facing the magnetic circuit system 13, and is shaped like a boss, so that the thickness of the center of the vibration plate 1211 is increased, the strength of the whole vibration plate 1211 is enhanced, the high-frequency resonance state of the sound generating device 1 is improved, and the high-frequency sound effect of the sound generating device 1 is improved.

Magnetic circuit system 13 includes a yoke 131, and a central magnetic path portion 132 and a side magnetic path portion 133 fixed to yoke 131, and voice coil 122 is disposed in a magnetic gap between central magnetic path portion 132 and side magnetic path portion 133. The central magnetic path portion 132 includes a central magnet 1321 and a central magnetic plate 1322 covering the central magnet 1321, and the side magnetic path portion 133 includes a side magnet 1331 and a side magnetic plate 1332 covering the side magnet 1331. In other embodiments, the edge of the yoke 131 may be bent toward the vibration system 12 to serve as the side magnetic path portion 133, and the function of the side magnetic path portion 133 may be realized, which is not limited herein.

A recess 1322a for avoiding the central portion 1211b is formed on a side of the central magnetic circuit portion 132 facing the vibration system 12, and a coverage area of an opening of the recess 1322a projected on the diaphragm 121 includes an area where the central portion 1211b is located. The protruding central portion 1211b is prevented from colliding with the central magnetic circuit portion 132 in the vibration process to influence the acoustic performance, the high-frequency resonance state of the sound generating device 1 is improved under the condition that the overall height of the sound generating device 1 is not increased, the high-frequency sound effect of the sound generating device 1 is improved, and the miniaturization and portability design of the electronic equipment is facilitated.

Further, the body 1211a and the center 1211b of the vibrating plate 1211 are integrally formed, and are integrally formed by machining, so that the assembling process between the body 1211a and the center 1211b is saved, and the process complexity is reduced. In other embodiments, other processing methods such as injection molding may be selected according to the material, and the method is not limited herein.

The utility model discloses among the technical scheme, the material of vibration board 1211 includes at least one of aluminium, aluminum alloy, carbon fiber, PET, PEN, PI expanded material, PMI expanded material. Of course, in other embodiments, the vibration plate 1211 may be made of other materials besides the above materials, and is not limited herein.

In the technical solution of the present invention, the central portion 1211b is a flat rectangular parallelepiped, and the body 1211a is convexly disposed on one side of the magnetic circuit system 13, and the corners around are provided with rounded corners to avoid stress concentration. In other embodiments, the shape of the central portion 1211b may be designed as one of a cylinder, a truncated pyramid or a truncated cone, and corners or edges may be rounded or chamfered or not chamfered, without limitation, as long as the purpose of improving the strength of the vibration plate 1211 can be achieved.

In the present invention, the central portion 1211b occupies 21.7% of the total area of the surface of the vibrating plate 1211 facing the magnetic circuit system 13, and the height of the central portion 1211b is 0.2 mm. In other embodiments, the central portion 1211b may occupy 5% to 99% of the total area of the surface of the vibration plate 1211 facing the magnetic circuit system 13, and the height of the central portion 1211b may be between 0.01mm and 3mm, so as to ensure the reinforcing effect on the overall strength of the vibration plate 1211 and improve the high-frequency resonance state of the sound generating device 1.

In the technical solution of the present invention, one side of central magnetic circuit portion 132 facing vibration system 12 is provided with a groove 1322a for avoiding central portion 1211b, and the coverage area of the opening projection of groove 1322a on diaphragm 121 contains central portion 1211b, providing sufficient avoiding space for central portion 1211b, preventing central portion 1211b from colliding with central magnetic circuit portion 132 in the vibration process and affecting the acoustic performance. Specifically, central magnetic circuit portion 132 includes central magnet 1321 and the central magnetic conductive plate 1322 that the lid was located central magnet 1321 among the technical scheme of the utility model, recess 1322a sets up in central magnetic conductive plate 1322, and recess 1322 a's open shape is the rectangle. In other embodiments, when the central portion 1211b is shaped like a frustum of a pyramid, the opening shape of the recess 1322a is preferably rectangular; when the central portion 1211b has a cylindrical or circular truncated cone shape, it is understood that the opening shape of the recess 1322a is preferably designed to be circular.

Further, the depth of recess 1322a is not less than the height of central portion 1211b, so that a certain gap is maintained between diaphragm 1211 and central magnetic circuit portion 132 when diaphragm 1211 vibrates to the lowest point along with voice coil 122, thereby preventing impact from affecting acoustic performance. In the technical solution of the present invention, the thickness of the central magnetic conducting plate 1322 is 0.3mm, and the depth of the groove 1322a is also set to 0.3mm, i.e. the groove 1322a completely penetrates through the central magnetic conducting plate 1322. In other embodiments, the recess 1322a may not penetrate through the central magnetic conducting plate 1322, or may penetrate through the central magnetic conducting plate 1322 while forming a recess 1322a with a certain depth on the central magnet 1321, or may even penetrate through the central magnetic conducting plate 1322 and the central magnet 1321 simultaneously, and the specific depth is not limited herein, and the specific design should be set according to the height of the central portion 1211b of the vibrating plate 1211, so as to provide a sufficient vibration space for the vibrating system 12, and the arrangement of the recess 1322a of the central magnetic circuit system 13 effectively reduces the overall weight of the sound generating apparatus 1.

On the other hand, the size of the opening of the recess 1322a is not limited in this patent, and the specific design should be set according to the size of the central portion 1211b of the vibrating plate 1211, and the coverage area of the opening of the recess 1322a projected on the vibrating diaphragm 121 includes the area of the central portion 1211b, so as to provide a sufficient space for the central portion 1211b, but it should be noted that, in order to ensure that the magnetic circuit 13 can provide a sufficient magnetic field strength, the area of the opening of the recess 1322a projected on the central magnet 1321 should be no more than 80% of the central magnet 1321.

Referring to fig. 3, fig. 3 is a schematic diagram comparing total harmonic distortion test curves of the sound generating apparatus 1 of the present invention and the sound generating apparatus 1 in the prior art. In the figure, the abscissa is frequency (Hz), the ordinate is total harmonic distortion (%), the solid line is the utility model discloses well sound generating mechanism 1's total harmonic distortion test curve, the dotted line is sound generating mechanism 1's total harmonic distortion test curve among the prior art. It can be seen that the THD of the sound generating apparatus 1 of the present invention is significantly reduced at the peak of the high frequency portion. This shows, the utility model discloses technical scheme's sound generating mechanism 1's high frequency resonance state obviously improves, and high frequency tone quality obtains promoting.

Compared with the prior art, the utility model discloses sound generating mechanism 1 among the technical scheme, one side at vibration board 1211 towards magnetic circuit 13 be equipped with an integrated into one piece fashioned central part 1211b, assembly processes have been saved, the process complexity has been reduced, set up the recess 1322a that is used for dodging central part 1211b in the position that central magnetic circuit part 132 corresponds with central part 1211b, prevent to collide and influence acoustic performance among the vibration process, under the condition that does not increase sound generating mechanism 1 overall height, the thickness at vibration board 1211 center has been increased, the holistic intensity of vibration board 1211 has been strengthened, the high frequency resonance state of sound generating mechanism 1 has been improved, the high frequency sound effect of sound generating mechanism 1 has been promoted, be favorable to electronic equipment's miniaturization, the design of portability.

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 comprising:

a magnetic circuit system for driving the vibration system;

it is characterized in that the preparation method is characterized in that,

2. The sound generating apparatus of claim 1, wherein the central portion and the body portion are integrally formed by machining or injection molding.

3. The sound generating apparatus as claimed in claim 1, wherein the material of the vibrating plate includes at least one of aluminum, aluminum alloy, carbon fiber, PET, PEN, PI foam, and PMI foam.

4. The apparatus according to claim 1, wherein the central portion is shaped as one of a rectangular parallelepiped, a cylinder, a truncated pyramid, and a truncated cone.

5. The sound generator of claim 4, wherein the central portion has a chamfer or radius.

6. The sound generating apparatus as claimed in claim 4, wherein the central portion occupies 5% to 99% of the total area of the surface of the vibration plate facing the magnetic circuit system.

7. The sound generator of claim 4, wherein the height of the center portion is between 0.01mm-3 mm.

8. The apparatus according to claim 1, wherein said central magnetic circuit portion comprises a central magnet and a central magnetic conductive plate covering said central magnet, and said recess is formed in or through said central magnetic conductive plate and is formed in said central magnet.

9. The sound generating apparatus of claim 8 wherein the depth of the groove is between 0.01mm and 5 mm.

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