WO2018233410A1

WO2018233410A1 - Diaphragm and micro speaker provided with the same

Info

Publication number: WO2018233410A1
Application number: PCT/CN2018/086887
Authority: WO
Inventors: 李柯; 何超锋; 宋健; 赵国栋
Original assignee: 歌尔股份有限公司
Priority date: 2017-06-19
Filing date: 2018-05-15
Publication date: 2018-12-27
Also published as: CN107155158A; CN107155158B

Abstract

The present invention relates to the technical field of electroacoustic products. Disclosed are a diaphragm and a micro speaker provided with the same. The diaphragm comprises a central portion, a ring portion, and a fixing portion which are sequentially connected from inside to outside. The ring portion includes patterns arranged therein. In a frontal projection plane of the diaphragm, the patterns include one or more first patterns arranged at an inner side of the ring portion close to the central portion and one or more second patterns arranged at an outer side of the ring portion close to the fixing portion. Both the first patterns and the second patterns are distributed radially and are crescent-shaped. In the diaphragm and the micro speaker provided with the same, the diaphragm oscillates stably, has high compliance and fatigue resistance, and is less likely to form creases thereon. Accordingly, the micro speaker has high sensitivity, less distortion and a large reliability margin.

Description

Diaphragm and micro sounder provided with the diaphragm

Technical field

The invention relates to the technical field of electroacoustic products, in particular to a diaphragm and a microphone provided with the diaphragm.

Background technique

Micro-speaker is an important acoustic component in portable electronic equipment. It is used to convert acoustic electric signals into sound signals. It is an energy conversion device. The micro-speaker usually includes a vibration system including a diaphragm and a voice coil, and the diaphragm includes a central portion, a folding portion and a fixing portion which are sequentially combined from the inside to the outside, and the diaphragm is a micro-sounding device. The important components play a vital role in the sound performance of the micro-speaker, which determines the quality of the micro-speaker from electrical energy to acoustic energy.

The pattern of the folding ring portion of the existing diaphragm is generally linear, and the pattern extends from one side edge to the other side edge of the folding ring portion. The diaphragm of such a structure generates the following defects when vibrating:

1. When the diaphragm vibrates at large displacement, it will have a rocking vibration, the vibration is not stable, and there is easy noise;

Second, the diaphragm is less compliant, resulting in lower sensitivity of the micro-sounder and poor acoustic performance;

Third, the diaphragm is prone to wrinkles at the four corners when vibrating, resulting in higher harmonic distortion, and at the same time, the diaphragm ring is fatigued, and it is difficult to pass the reliability test.

Summary of the invention

In view of the above drawbacks, the first technical problem to be solved by the present invention is to provide a diaphragm which has stable vibration, high compliantness, and is less prone to wrinkles at the corners, and can effectively reduce high-order harmonic distortion and can improve The reliability and sound quality of the micro-speaker.

Based on the same inventive concept, the second technical problem to be solved by the present invention is to provide a micro-sounding device which does not generate noise, has high sensitivity, low harmonic distortion and high sound quality.

In order to solve the above first technical problem, the technical solution of the present invention is:

A diaphragm comprising a central portion, a loop portion and a fixing portion which are sequentially connected from the inside to the outside, wherein the loop portion is provided with a pattern, and in the orthographic projection surface of the diaphragm, the pattern includes being disposed close to At least one first pattern on the inner side of the folded portion of the central portion and at least one second pattern disposed on the outer side of the folded ring of the fixed portion, the first pattern and the second pattern are radially distributed, and They are all crescent-shaped patterns.

Wherein the first pattern and the second pattern are distributed at the curved corners of the folding ring portion.

Wherein, in the orthographic projection surface of the diaphragm, the first pattern and the second pattern are symmetrically distributed with respect to a midpoint of the arcuate corner and a midpoint of the outer edge.

Wherein, in the orthographic projection surface of the diaphragm, the first pattern on both sides of the midpoint line is convex toward a direction near the midpoint line or away from the midpoint line The direction is convex; the second pattern is convex toward a direction close to the midpoint line or is convex away from a line connecting the midpoint.

Wherein, in a front projection plane of the diaphragm, a third pattern is provided at a central position inside the arc corner, the third pattern is a linear pattern, and the third pattern is from the center portion Extending to the fixing portion; the first pattern is distributed on both sides of the third pattern and is symmetrically distributed.

Wherein, in the front projection plane of the diaphragm, the first patterns on both sides of the third pattern are convex in a direction away from the third pattern.

Wherein, in the orthographic projection surface of the diaphragm, a fourth pattern is provided on the midpoint connecting line outside the curved corner, the fourth pattern is a linear pattern, and the fourth pattern is The fixing portion extends toward the central portion; the second pattern is distributed on both sides of the fourth pattern and is symmetrically distributed.

Wherein, in the orthographic projection surface of the diaphragm, the first pattern and the second pattern on both sides of the midpoint line are both convex toward a direction of the midpoint line.

Wherein, in the orthographic projection surface of the diaphragm, the width of one end of the straight line near the edge of the curved corner is smaller than the width of the other end.

In order to solve the above second technical problem, the technical solution of the present invention is:

A miniature sound generator comprising a vibration system and a magnetic circuit system, the vibration system comprising a diaphragm and a voice coil combined, the diaphragm being the diaphragm.

After adopting the above technical solutions, the beneficial effects of the present invention are:

Since the folded portion of the diaphragm of the present invention includes a curved corner, a pattern is distributed on the curved corner, and in the orthographic projection surface of the diaphragm, the pattern includes at least one first pattern disposed on the inner side of the folded ring near the central portion and disposed at At least one second pattern near the outer side of the folding ring of the fixing portion, the first pattern and the second pattern are radially distributed, and both are crescent-shaped. Such a two-row crescent pattern has the following advantages over the prior art single-row linear pattern diaphragm:

First, it can effectively suppress the rocking vibration of the diaphragm during large displacement, so that the diaphragm is more stable during vibration and does not produce noise;

Second, it can increase the smoothness of the diaphragm, which can make the micro-sounder get higher sensitivity and have better low-frequency performance;

Third, it can reduce the generation of wrinkles at the corner of the diaphragm, can effectively reduce the high-order harmonic distortion at the resonant frequency, and improve the sound quality of the micro-sounder;

Fourth, it can effectively alleviate the problem of large stress at the corner of the diaphragm, effectively reduce the polarization, improve the fatigue resistance of the folding ring part, and improve the reliability margin of the micro sounder.

Since the diaphragm of the micro-sounder of the present invention is the diaphragm described above, noise is not generated, sensitivity is high, high-order harmonic distortion is small, sound quality is high, and reliability margin is large.

In summary, the diaphragm of the present invention and the micro-speaker provided with the diaphragm solve the technical problems of unstable vibration, low compliantness, and easy wrinkling of the diaphragm in the prior art, and the diaphragm of the present invention and the same The diaphragm of the micro-sounder of the diaphragm has stable vibration, high compliantness, less wrinkles and strong fatigue resistance, so that the micro-sounder has high sensitivity, small distortion, high sound quality and large reliability margin.

DRAWINGS

1 is a schematic perspective view showing a first embodiment of a diaphragm of the present invention;

2 is a schematic view showing the orthographic projection structure of the first embodiment of the diaphragm of the present invention;

3 is a schematic perspective view showing the second embodiment of the diaphragm of the present invention;

4 is a schematic view showing the orthographic projection structure of the second embodiment of the diaphragm of the present invention;

In the figure: 10, fixing portion, 12, folding ring portion, 14, central portion, 20a, first pattern, 20b, first pattern, 22a, second pattern, 22b, second pattern, 24, third pattern, 26 The fourth pattern.

Detailed ways

The invention will now be further elucidated with reference to the drawings and embodiments.

Embodiment 1:

As shown in FIG. 1 and FIG. 2, a diaphragm includes a center portion 14, a folded ring portion 12, and a fixing portion 10 which are integrally connected in order from the inside to the outside. The loop portion 12 includes curved corners and first and second sides joined by curved corners. A pattern is distributed on the folded ring portion 12, and the pattern includes at least one first pattern 20a disposed on the inner side of the folded ring near the central portion 14 and on the outer side of the folded ring near the fixed portion 10 in the orthographic projection surface of the diaphragm. At least one second pattern 22a. The first pattern 20a is radially distributed from the inner edge of the folded portion 12 toward the central portion of the folded portion 12, and the second pattern 22a is radially distributed from the outer edge of the folded portion 12 toward the middle of the folded portion 12, and the first pattern The 20a and the second pattern 22a do not interfere with each other, that is, there is no overlap between each of the first patterns 20a and each of the second patterns 22a.

It should be noted that the inner edge of the loop portion refers to a side edge near the center portion 14, and the outer edge of the loop portion refers to a side edge near the fixed portion 10.

As shown in FIG. 1 and FIG. 2, the first pattern 20a and the second pattern 22a may be concave patterns opposite to the convex direction of the folding ring portion 12, or may be the same convex direction as the convex direction of the folding ring portion 12. The pattern is not limited by the present invention.

As shown in FIG. 1 and FIG. 2, in the embodiment, the diaphragm is preferably a square structure, and the corresponding folding portion 12 is a square ring structure, and the arc corners are provided in four places, and the first pattern 20a and the second pattern 22a are both Set at the corner of the arc, and the pattern structure set on the four corners of the arc is the same.

It should be noted that, in the embodiment of the present invention, the diaphragm may also be a structure of other shapes, such as a racetrack-shaped structure, which is not limited by the present invention. Further, when the diaphragm has a structure of another shape, the loop is a ring-shaped structure of a corresponding shape. For example, when the diaphragm is a racetrack-shaped structure, the folding ring may be a racetrack-shaped annular structure. At the same time, the arrangement of the pattern at the curved corner is preferred in the embodiment. In practical applications, the pattern may also be disposed at a straight line segment of the folding ring portion, which is not limited in this embodiment.

As shown in FIG. 2, in the front projection plane of the diaphragm, in the present embodiment, each of the first pattern 20a and each of the second patterns 22a is preferably between the midpoint of the inner edge of the curved corner and the midpoint of the outer edge. The line is symmetrically distributed, that is, symmetrically distributed with respect to the midpoint of the curved corner and the midpoint of the outer edge. The first pattern 20a and the second pattern 22a are both crescent-shaped, that is, an arc-shaped pattern having narrow ends at the center and the width. The first patterns 20a on both sides of the midpoint line are all convex in a direction away from the midpoint line, and the second patterns 22a on both sides of the midpoint line are all convex toward the midpoint line. When the diaphragm is vibrated, the folds of the crescent pattern will be narrow to wide, and then transition from wide to narrow, so that the nonlinear vibration can be effectively reduced, making the diaphragm vibrate more smoothly. Improves the reliability and sound quality of micro-speakers.

It should be noted that the convex directions of the first pattern and the second pattern are not limited to the opposite design in the embodiment, and the same design or other different designs may be selected in practical applications, for example, the first pattern and The second pattern is convex toward the line connecting the midpoint, or both are convex away from the midpoint line, or the second pattern is convex away from the midpoint line, and the first pattern is near the midpoint. The direction of the connection is raised, and the like, which is not limited in this embodiment.

It should be noted that the number of the first pattern 20a and the second pattern 22a is not limited in this embodiment, and the designer can design according to the structure of the folding portion 12 and the required product performance, and the number of the two can be the same. Alternatively, the gist of the present invention is that the inner and outer sides of the curved corner are respectively provided with crescent shapes that do not interfere with each other, and not the number of the respective patterns, such as only the difference in the number of strips, It also falls within the scope of protection of the present invention.

As shown in FIG. 2, a third pattern 24 is further provided at an intermediate position of each of the first patterns 20a, that is, the third pattern 24 is disposed at a center position inside the curved corner. The third pattern 24 is a linear pattern, and the third pattern 24 extends from the central portion 14 toward the fixed portion 10 and extends to the middle of the curved corner. The third pattern 24 corresponds to the center of each of the first patterns 20a and is located at the third pattern. The first patterns 20a on both sides of the 24 are symmetrically distributed with respect to the third pattern 24. In the present embodiment, the first patterns 20a located on both sides of the third pattern 24 are all convex away from the third pattern 24, and are located at the third position. The second patterns 22a on both sides of the pattern 24 extension line (i.e., the midpoint line) are all convex toward the direction in which the third pattern 24 is extended.

Further, the width of one end of the inner edge of the third pattern 24 near the curved corner is smaller than the width of the other end, that is, approximately the shape of a water drop. It can further reduce the rocking vibration of the diaphragm, reduce the polarization, and make the diaphragm more stable when vibrating.

It should be noted that the first patterns 20a located on both sides of the third pattern 24 may also be convex toward the third pattern 24, and at the same time on the extension of the third pattern 24 (ie, the midpoint line). The two patterns 22a may be convex toward the direction in which the third pattern 24 is extended, or may be convex away from the extension of the third pattern 24. This embodiment does not limit this.

Embodiment 2:

This embodiment is basically the same as the first embodiment, and the difference is that:

As shown in FIG. 3 and FIG. 4, in the orthographic projection surface of the diaphragm, only the first pattern 20b is provided on the inner side of the curved corner, and the second pattern 22b and the fourth pattern 26 are provided on the outer side of the curved corner. The four patterns 26 are disposed at intermediate positions of the respective second patterns 22b, that is, the fourth patterns 26 are disposed at the center position outside the curved corners. The fourth pattern 26 is also a rectilinear pattern extending from the fixing portion 10 toward the central portion 14 and extending to the middle of the curved corner. The fourth pattern 26 corresponds to the center of each of the second patterns 22b, and is located at the fourth pattern 26 The second pattern 22b on the side is symmetrically distributed with respect to the fourth pattern 26. In the present embodiment, the second patterns 22b located on both sides of the fourth pattern 26 are all convex toward the fourth pattern 26, and are located in the fourth pattern 26 at this time. The first patterns 20b on both sides of the extension line (i.e., the midpoint line) are also convex toward the direction in which the extension of the fourth pattern 26 is extended.

Further, the width of one end of the outer edge of the fourth pattern 26 near the curved corner is smaller than the width of the other end, and is also approximately a shape of a water drop. The pattern design of the present embodiment can also effectively reduce the nonlinear vibration, making the diaphragm vibrate more smoothly, and improving the reliability and sound quality of the microphone.

It should be noted that the second patterns 22b located on both sides of the fourth pattern 26 may also be convex away from the fourth pattern 26, and at the same time on both sides of the extension line of the fourth pattern 26 (ie, the midpoint line). A pattern 20b may be convex toward the direction in which the fourth pattern 26 is extended, or may be convex away from the extension of the fourth pattern 26. This embodiment does not limit this.

The invention provides a crescent-shaped pattern which does not interfere with each other on the inner and outer sides of the folding ring portion, effectively improves the vibration stability of the diaphragm, increases the smoothness of the diaphragm, reduces the generation of wrinkles, and improves the resistance. The strength of fatigue can pass the reliability test.

Embodiment 3:

A miniature sound generator comprising a vibration system and a magnetic circuit system, the vibration system comprising a diaphragm and a voice coil combined, the diaphragm being the diaphragm described in the first embodiment and the second embodiment.

Since the micro-speaker of the present invention employs the diaphragms described in the first embodiment and the second embodiment, it has the advantages of no noise, high sensitivity, low harmonic distortion, high sound quality, and large reliability margin.

The present invention is not limited to the specific embodiments described above, and various changes made by those skilled in the art without departing from the inventive concept are all within the scope of the present invention.

Claims

a diaphragm comprising a central portion, a loop portion and a fixing portion which are sequentially connected from the inside to the outside, wherein the folding ring portion is provided with a pattern, wherein the pattern includes a setting in a front projection surface of the diaphragm At least one first pattern on the inner side of the folded ring near the central portion and at least one second pattern disposed on the outer side of the folded ring near the fixed portion, the first pattern and the second pattern are radially distributed And all are crescent-shaped patterns.
The diaphragm according to claim 1, wherein the first pattern and the second pattern are distributed at arcuate corners of the folded portion.
The diaphragm according to claim 2, wherein said first pattern and said second pattern are both opposite inner and outer edges of said curved corner in a front projection plane of said diaphragm The midpoints are symmetrically distributed.
The diaphragm according to claim 3, wherein in the orthographic projection surface of the diaphragm, the first pattern on both sides of the midpoint line is oriented in a direction close to the midpoint line Raising or protruding in a direction away from the midpoint line;

The second pattern is convex toward a direction near the midpoint line or in a direction away from the midpoint line.
The diaphragm according to any one of claims 1 to 4, wherein a third pattern is provided at a center position of the arcuate corner inside the orthographic projection surface of the diaphragm. The three patterns are linear patterns, and the third pattern extends from the central portion toward the fixing portion; the first patterns are distributed on both sides of the third pattern and are symmetrically distributed.
The diaphragm according to claim 5, wherein in the orthographic projection surface of the diaphragm, the first patterns on both sides of the third pattern are convex toward a direction away from the third pattern Start.
The diaphragm according to any one of claims 1 to 6, wherein a fourth pattern is provided at a center position outside the curved corner in the orthographic projection surface of the diaphragm. The four patterns are linear patterns, and the fourth pattern extends from the fixing portion toward the center portion; the second pattern is distributed on both sides of the fourth pattern and is symmetrically distributed.
The diaphragm according to claim 7, wherein in the orthographic projection surface of the diaphragm, the first pattern and the second pattern on both sides of the midpoint line are both approached The direction of the midpoint connection is raised.
The diaphragm according to any one of claims 5 to 8, wherein in the orthographic projection surface of the diaphragm, the width of one end of the straight line near the edge of the curved corner is smaller than the other end thereof. The width.
A microspeaker comprising a vibrating system and a magnetic circuit system, the vibrating system comprising a diaphragm and a voice coil combined, wherein the diaphragm is a diaphragm according to any one of claims 1 to 9.