WO2018233410A1 - 振膜及设有该振膜的微型发声器 - Google Patents

振膜及设有该振膜的微型发声器 Download PDF

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Publication number
WO2018233410A1
WO2018233410A1 PCT/CN2018/086887 CN2018086887W WO2018233410A1 WO 2018233410 A1 WO2018233410 A1 WO 2018233410A1 CN 2018086887 W CN2018086887 W CN 2018086887W WO 2018233410 A1 WO2018233410 A1 WO 2018233410A1
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Prior art keywords
pattern
diaphragm
patterns
projection surface
sides
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English (en)
French (fr)
Inventor
李柯
何超锋
宋健
赵国栋
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Goertek Inc
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Goertek Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the invention relates to the technical field of electroacoustic products, in particular to a diaphragm and a microphone provided with the diaphragm.
  • 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:
  • the diaphragm is less compliant, resulting in lower sensitivity of the micro-sounder and poor acoustic performance
  • 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.
  • 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.
  • 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.
  • 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.
  • first pattern and the second pattern are distributed at the curved corners of the folding ring portion.
  • 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.
  • 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.
  • 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.
  • the first patterns on both sides of the third pattern are convex in a direction away from the third pattern.
  • 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.
  • the first pattern and the second pattern on both sides of the midpoint line are both convex toward a direction of the midpoint line.
  • 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.
  • 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.
  • the folded portion of the diaphragm of the present invention includes a curved corner
  • a pattern is distributed on the curved corner
  • 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:
  • 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.
  • 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.
  • FIG. 1 is a schematic perspective view showing a first embodiment of a diaphragm of the present invention
  • FIG. 2 is a schematic view showing the orthographic projection structure of the first embodiment of the diaphragm of the present invention
  • FIG. 3 is a schematic perspective view showing the second embodiment of the diaphragm of the present invention.
  • FIG. 4 is a schematic view showing the orthographic projection structure of the second embodiment of the diaphragm of the present invention.
  • the fourth pattern is not limited to:
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • 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.
  • 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.
  • 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.
  • 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.
  • the diaphragm may also be a structure of other shapes, such as a racetrack-shaped structure, which is not limited by the present invention.
  • the loop is a ring-shaped structure of a corresponding shape.
  • the folding ring may be a racetrack-shaped annular structure.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 is a diagrammatic representation of Embodiment 1:
  • This embodiment is basically the same as the first embodiment, and the difference is that:
  • the first pattern 20b is provided on the inner side of the curved corner
  • 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.
  • 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
  • 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.
  • 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 is a diagrammatic representation of 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

本发明公开了一种振膜及设有该振膜的微型发声器，涉及电声产品技术领域，包括由内向外依次连接的中心部、折环部和固定部，所述折环部上分布有花纹，在所述振膜的正投影面内，所述花纹包括设置在靠近所述中心部的折环内侧的至少一条第一花纹和设置在靠近所述固定部的折环外侧的至少一条第二花纹，所述第一花纹及所述第二花纹均呈放射状分布，且均为月牙形花纹。本发明振膜及设有该振膜的微型发声器的振膜振动平稳、顺性高、不易产生褶皱、抗疲劳能力强，从而微型发声器的灵敏度高，失真小，可靠性余量大。

Description

振膜及设有该振膜的微型发声器 技术领域
本发明涉及电声产品技术领域，特别涉及一种振膜及设有该振膜的微型发声器。
背景技术
微型发声器是便携式电子设备中一种重要的声学部件，用于将声波电信号转换成声音信号传出，是一种能量转换器件。微型发声器通常包括振动系统和磁路系统，振动系统包括结合在一起的振膜和音圈，振膜包括由内向外依次结合的中心部、折环部和固定部，振膜是微型发声器的重要部件，对微型发声器的放声性能有着至关重要的作用，它决定了微型发声器由电能到声能的转换质量。
现有振膜的折环部的花纹通常呈直线形，且花纹由折环部的一侧边缘延伸至另一侧边缘，此种结构的振膜在振动时会产生如下缺陷：
一、振膜在大位移振动时会出现摇摆振动，振动不平稳，易有杂音出现；
二、振膜顺性较低，导致微型发声器的灵敏度较低，声学性能差；
三、振膜在振动时四角部易出现褶皱，导致高次谐波失真较高，同时还会使得振膜折环部疲劳，不易通过可靠性试验。
发明内容
针对以上缺陷，本发明所要解决的第一个技术问题是提供一种振膜，此振膜振动平稳，顺性较高，角部不易出现褶皱，能够有效的降低高次谐波失真，能够提高微型发声器的可靠性及声音质量。
基于同一个发明构思，本发明所要解决的第二个技术问题是提供一种微型发声器，此微型发声器不会产生杂音，灵敏度高，高次谐波失真小，声音质 量高。
为解决上述第一个技术问题，本发明的技术方案是：
一种振膜，包括由内向外依次连接的中心部、折环部和固定部，所述折环部上分布有花纹，在所述振膜的正投影面内，所述花纹包括设置在靠近所述中心部的折环内侧的至少一条第一花纹和设置在靠近所述固定部的折环外侧的至少一条第二花纹，所述第一花纹及所述第二花纹均呈放射状分布，且均为月牙形花纹。
其中，所述折环部的弧形拐角处分布有所述第一花纹和所述第二花纹。
其中，在所述振膜的正投影面内，所述第一花纹和所述第二花纹均相对于所述弧形拐角的内侧边缘与外侧边缘的中点连线对称分布。
其中，在所述振膜的正投影面内，位于所述中点连线两侧的所述第一花纹向靠近所述中点连线的方向凸起或向远离所述中点连线的方向凸起；所述第二花纹向靠近所述中点连线的方向凸起或向远离所述中点连线的方向凸起。
其中，在所述振膜的正投影面内，位于所述弧形拐角内侧的中心位置处设有第三花纹，所述第三花纹为直线形花纹，所述第三花纹由所述中心部向所述固定部延伸；所述第一花纹分布在所述第三花纹的两侧，并呈对称分布。
其中，在所述振膜的正投影面内，位于所述第三花纹两侧的所述第一花纹均向远离所述第三花纹的方向凸起。
其中，在所述振膜的正投影面内，位于所述弧形拐角外侧的所述中点连线上设有第四花纹，所述第四花纹为直线形花纹，所述第四花纹由所述固定部向所述中心部延伸；所述第二花纹分布在所述第四花纹两侧，并呈对称分布。
其中，在所述振膜的正投影面内，位于所述中点连线两侧的所述第一花纹和所述第二花纹均向靠近所述中点连线的方向凸起。
其中，在所述振膜的正投影面内，所述直线形花纹靠近所述弧形拐角的边缘一端的宽度小于其另一端的宽度。
为解决上述第二个技术问题，本发明的技术方案是：
一种微型发声器，包括振动系统和磁路系统，所述振动系统包括结合在一起的振膜和音圈，所述振膜为上述振膜。
采用了上述技术方案后，本发明的有益效果是：
由于本发明振膜的折环部包括弧形拐角，弧形拐角上分布有花纹，在振膜的正投影面内，花纹包括设置靠近中心部的折环内侧的至少一条第一花纹和设置在靠近固定部的折环外侧的至少一条第二花纹，第一花纹及第二花纹均呈放射状分布，且均为月牙形花纹。此种两排月牙形花纹与现有技术中的单排直线形花纹的振膜相比具有如下优点：
一、能够有效的抑制振膜在大位移时摇摆振动，使得振膜在振动时更加平稳，不会产生杂音；
二、能够增加振膜的顺性，可使得微型发声器获得更高灵敏度，具有更优的低频性能；
三、能够减小振膜拐角处褶皱的产生，能够有效的降低谐振频率处的高次谐波失真，提高微型发声器的声音质量；
四、可以有效的减缓振膜拐角处应力大的问题，有效减轻偏振，提高折环部的抗疲劳能力，提高了微型发声器的可靠性余量。
由于本发明微型发声器的振膜为上述振膜，从而不会产生杂音，灵敏度高，高次谐波失真小，声音质量高，可靠性余量大。
综上所述，本发明振膜及设有该振膜的微型发声器解决了现有技术中振膜振动不平稳、顺性低、易产生褶皱等技术问题，本发明振膜及设有该振膜的微型发声器的振膜振动平稳、顺性高、不易产生褶皱、抗疲劳能力强，从而微型发声器的灵敏度高，失真小，声音质量高，可靠性余量大。
附图说明
图1是本发明振膜实施例一的立体结构示意图；
图2是本发明振膜实施例一的正投影结构示意图；
图3是本发明振膜实施例二的立体结构示意图；
图4是本发明振膜实施例二的正投影结构示意图；
图中：10、固定部，12、折环部，14、中心部，20a、第一花纹，20b、第一花纹，22a、第二花纹，22b、第二花纹，24、第三花纹，26、第四花纹。
具体实施方式
下面结合附图和实施例，进一步阐述本发明。
实施例一：
如图1和图2共同所示，一种振膜，包括由内向外依次连接为一体的中心部14、折环部12和固定部10。折环部12包括弧形拐角及由弧形拐角连接的第一边及第二边。折环部12上分布有花纹，在振膜的正投影面内，花纹包括设置在靠近中心部14的折环内侧的至少一条第一花纹20a，及设置在靠近固定部10的折环外侧的至少一条第二花纹22a。第一花纹20a由折环部12的内边缘向折环部12的中部呈放射状分布，第二花纹22a由折环部12的外边缘向折环部12的中部呈放射状分布，且第一花纹20a与第二花纹22a互不干涉，即各第一花纹20a与各第二花纹22a之间均不存在重叠。
需要说明的是，折环部的内边缘是指靠近中心部14的一侧边缘，折环部的外边缘是指靠近固定部10的一侧边缘。
如图1和图2共同所示，第一花纹20a和第二花纹22a可以是与折环部12的凸起方向相反的凹花纹，也可以是与折环部12的凸起方向相同的凸花纹，本发明对此不做限制。
如图1和图2共同所示，本实施方式中优选振膜为方形结构，相应的折环部12为方环形结构，弧形拐角共设有四处，第一花纹20a和第二花纹22a均设置在弧形拐角处，且设置在四处弧形拐角上的花纹结构相同。
需要说明的是，在本发明实施例中，振膜还可以是其他形状的结构，例如跑道形结构，本发明对此不做限制。并且在振膜的为其他形状的结构时，则折环为相应形状的环状结构。例如，在振膜为跑道形结构时，则折环可以为跑道形环状结构。同时，花纹设置在弧形拐角处为本实施方式的优选，实际应用中花纹也可以设置在折环部的直线段处，本实施例对此不做限制。
如图2所示，在振膜的正投影面内，本实施方式优选各第一花纹20a和各第二花纹22a均相对于弧形拐角的内侧边缘的中点与外侧边缘的中点之间的连线对称分布，即相对于弧形拐角的内侧边缘与外侧边缘的中点连线对称分布。 第一花纹20a和第二花纹22a均为月牙形花纹，即为中间宽两端窄的弧形花纹。位于中点连线两侧的第一花纹20a均向远离该中点连线的方向凸起，位于中点连线两侧的第二花纹22a均向靠近该中点连线的方向凸起。此种花纹的设计在振膜振动时，月牙形花纹的花纹处褶皱会由窄到宽，再由宽到窄进行过渡，从而能够有效的减小非线性振动，使得振膜振动时更加平稳，能够提高微型发声器的可靠性和声音质量。
需要说明的是，第一花纹和第二花纹的凸起方向并不限于本实施方式中的相反设计，在实际应用中也可以选择相同的设计或是其他不同的设计，例如，第一花纹和第二花纹均向靠近中点连线的方向凸起，或者均向远离中点连线的方向凸起，或者第二花纹向远离中点连线的方向凸起，第一花纹向靠近中点连线的方向凸起等，本实施例对此不做限制。
需要说明的是，第一花纹20a和第二花纹22a的条数本实施方式不做限制，设计人员可根据折环部12的结构及所需的产品性能来设计，二者的数量可相同，也可不同，本发明的发明要点在于弧形拐角处的内、外两侧分别设置有互不干涉的月牙形花纹，而不在于各花纹的条数，如仅是条数上的差别，那么也落入本发明的保护范围之内。
如图2所示，进一步的在各第一花纹20a的中间位置设置有第三花纹24，即第三花纹24设置在弧形拐角内侧的中心位置处。第三花纹24为直线形花纹，第三花纹24由中心部14向固定部10延伸，并延伸至弧形拐角的中部，第三花纹24相当于各第一花纹20a的中心，位于第三花纹24两侧的第一花纹20a相对于第三花纹24对称分布，本实施方式中位于第三花纹24两侧的第一花纹20a均向远离第三花纹24的方向凸起，此时位于第三花纹24延长线(即中点连线)两侧的第二花纹22a均向靠近第三花纹24延长线的方向凸起。
进一步的，第三花纹24靠近弧形拐角的内边缘一端的宽度小于其另一端的宽度，即近似为水滴形状。能够进一步的减小振膜的摇摆振动，减轻偏振，使振膜在振动时更加平稳。
需要说明的是，位于第三花纹24两侧的第一花纹20a也可以均向靠近第三花纹24的方向凸起，同时位于第三花纹24延长线(即中点连线)两侧的第 二花纹22a可以向靠近第三花纹24延长线的方向凸起，也可以向远离第三花纹24延长线的方向凸起。本实施例对此不做限制。
实施例二：
本实施方式与实施例一基本相同，其不同之处在于：
如图3和图4共同所示，在振膜的正投影面内，弧形拐角的内侧仅设有第一花纹20b，弧形拐角的外侧设有第二花纹22b和第四花纹26，第四花纹26设置在各第二花纹22b的中间位置，即第四花纹26设置在弧形拐角外侧的中心位置处。此第四花纹26也为直线形花纹，由固定部10向中心部14延伸，并延伸至弧形拐角的中部，第四花纹26相当于各第二花纹22b的中心，位于第四花纹26两侧的第二花纹22b相对于第四花纹26对称分布，本实施方式中位于第四花纹26两侧的第二花纹22b均向靠近第四花纹26的方向凸起，此时位于第四花纹26延长线(即中点连线)两侧的第一花纹20b也均向靠近第四花纹26延长线的方向凸起。
进一步的，第四形花纹26靠近弧形拐角的外边缘一端的宽度小于其另一端的宽度，也近似为水滴形状。本实施方式的花纹设计同样能够有效的减小非线性振动，使得振膜振动时更加平稳，能够提高微型发声器的可靠性和声音质量。
需要说明的是，位于第四花纹26两侧的第二花纹22b也可以均向远离第四花纹26的方向凸起，同时位于第四花纹26延长线(即中点连线)两侧的第一花纹20b可以向靠近第四花纹26延长线的方向凸起，也可以向远离第四花纹26延长线的方向凸起。本实施例对此不做限制。
本发明在折环部的内、外两侧上设置互不干涉的月牙形花纹，有效的提高了振膜振动的平稳性，增加了振膜的顺性，减少了褶皱的产生，提高了抗疲劳的强度，能够通过可靠性试验。
实施例三：
一种微型发声器，包括振动系统和磁路系统，振动系统包括结合在一起的振膜和音圈，振膜为实施例一和实施例二中描述的振膜。
由于本发明微型发声器采用了实施例一和实施例二中描述的振膜，从而具 有不会产生杂音，灵敏度高，高次谐波失真小，声音质量高，可靠性余量大等优点。
本发明不局限于上述具体的实施方式，本领域的普通技术人员从上述构思出发，不经过创造性的劳动，所做出的种种变换，均落在本发明的保护范围之内。

Claims (10)

  1. 振膜，包括由内向外依次连接的中心部、折环部和固定部，所述折环部上分布有花纹，其特征在于，在所述振膜的正投影面内，所述花纹包括设置在靠近所述中心部的折环内侧的至少一条第一花纹和设置在靠近所述固定部的折环外侧的至少一条第二花纹，所述第一花纹及所述第二花纹均呈放射状分布，且均为月牙形花纹。
  2. 根据权利要求1所述的振膜，其特征在于，所述折环部的弧形拐角处分布有所述第一花纹及所述第二花纹。
  3. 根据权利要求2所述的振膜，其特征在于，在所述振膜的正投影面内，所述第一花纹和所述第二花纹均相对于所述弧形拐角的内侧边缘与外侧边缘的中点连线对称分布。
  4. 根据权利要求3所述的振膜，其特征在于，在所述振膜的正投影面内，位于所述中点连线两侧的所述第一花纹向靠近所述中点连线的方向凸起或向远离所述中点连线的方向凸起；
    所述第二花纹向靠近所述中点连线的方向凸起或向远离所述中点连线的方向凸起。
  5. 根据权利要求1－4任一项所述的振膜，其特征在于，在所述振膜的正投影面内，位于所述弧形拐角内侧的中心位置处设有第三花纹，所述第三花纹为直线形花纹，所述第三花纹由所述中心部向所述固定部延伸；所述第一花纹分布在所述第三花纹两侧，并呈对称分布。
  6. 根据权利要求5所述的振膜，其特征在于，在所述振膜的正投影面内，位于所述第三花纹两侧的所述第一花纹均向远离所述第三花纹的方向凸起。
  7. 根据权利要求1－6任一项所述的振膜，其特征在于，在所述振膜的正投影面内，位于所述弧形拐角外侧的中心位置处设有第四花纹，所述第四花纹为直线形花纹，所述第四花纹由所述固定部向所述中心部延伸；所述第二花纹分布在所述第四花纹两侧，并呈对称分布。
  8. 根据权利要求7所述的振膜，其特征在于，在所述振膜的正投影面内， 位于所述中点连线两侧的所述第一花纹和所述第二花纹均向靠近所述中点连线的方向凸起。
  9. 根据权利要求5至8任一项所述的振膜，其特征在于，在所述振膜的正投影面内，所述直线形花纹靠近所述弧形拐角的边缘一端的宽度小于其另一端的宽度。
  10. 微型发声器，包括振动系统和磁路系统，所述振动系统包括结合在一起的振膜和音圈，其特征在于，所述振膜为权利要求1至9任一权利要求所述的振膜。
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