WO2018214785A1 - 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
WO2018214785A1
WO2018214785A1 PCT/CN2018/086890 CN2018086890W WO2018214785A1 WO 2018214785 A1 WO2018214785 A1 WO 2018214785A1 CN 2018086890 W CN2018086890 W CN 2018086890W WO 2018214785 A1 WO2018214785 A1 WO 2018214785A1
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Prior art keywords
curved
diaphragm
pattern
corner
vibrating diaphragm
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PCT/CN2018/086890
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English (en)
French (fr)
Inventor
李柯
何超锋
宋健
赵国栋
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歌尔股份有限公司
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Publication of WO2018214785A1 publication Critical patent/WO2018214785A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2207/00—Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
    • H04R2207/021—Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

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 elongated, and the extending direction of the pattern is perpendicular to the direction 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 fatigue resistance. High capacity to improve the reliability margin of micro-speakers.
  • the second technical problem to be solved by the present invention is to provide a miniature sound generator that does not generate noise, has high sensitivity, low harmonic distortion, high sound quality, and reliability. large.
  • 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, the folding ring portion including a curved corner, and a first side and a second side connected by the curved corner a pattern is disposed on the arcuate corner, and the pattern includes at least one curved pattern in the orthographic projection surface of the diaphragm, and each of the curved patterns is adjacent to the folded portion The first side extends toward the second side, and the curved pattern at each of the curved corners is sequentially arranged from the inner side to the outer side of the curved corner.
  • the curved convex direction of the curved pattern coincides with the curved convex direction of the curved corner.
  • the pattern further comprises at least one linear pattern; wherein the curved pattern is distributed inside or outside the curved corner, and the linear pattern is distributed The outer side or the inner side of the curved corner.
  • the linear pattern is radially distributed in a direction from the inner side to the outer side of the curved corner or the straight line is on the outer side to the inner side of the curved corner Radially distributed in the direction.
  • the width of one end of the rectilinear pattern near the outer edge of the arcuate corner is smaller than the width of one end of the inner edge of the arcuate corner.
  • the linear pattern is symmetrically distributed with respect to a midpoint of the arcuate corner and a midpoint of the outer edge.
  • the curved pattern is provided with at least two, and at least two curved patterns extend along a trajectory of at least two concentric circles corresponding to the number of curved patterns.
  • the center of each of the concentric circles is located on the central portion.
  • the center of each of the concentric circles overlaps the center of the circle where the inner edge of the curved corner is located.
  • 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 curved corners, and the first side and the second side connected by the curved corners, the curved corners are distributed with a pattern, and in the orthographic projection surface of the diaphragm, the at least A curved pattern, and each of the curved patterns extends from the first side to the second side, and the curved pattern at each of the curved corners is sequentially arranged from the inner side to the outer side of the curved corner.
  • Such a pattern in which the extending direction extends from one end of the curved corner to the other end, that is, the pattern substantially conforming to the direction of the folding ring portion has the following advantages as compared with the pattern in the prior art in which the extending direction is perpendicular to the direction of the folding ring portion. :
  • the generation of wrinkles at the corners of the diaphragm can be reduced, the harmonic distortion at the resonant frequency can be effectively reduced, and the fatigue resistance of the folded portion can be improved, and the reliability margin of the micro-sounder can be improved.
  • 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.
  • Figure 5 is a perspective view showing the three-dimensional structure of the third embodiment of the diaphragm of the present invention.
  • Figure 6 is a schematic view showing the orthographic projection structure of the third embodiment of the diaphragm of the present invention.
  • 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 20a is disposed on the arcuate corner of the loop portion 12, and the pattern 20a includes at least one curved pattern 22 in the orthographic projection surface of the diaphragm, and each of the curved patterns 22 is adjacent to the loop portion 12.
  • the first side extends in the second direction, that is, each of the curved lines 22 extends from one end of the curved corner to the other end.
  • the curved lines 22 at each of the curved corners are sequentially arranged in the direction from the inner side to the outer side of the curved corner.
  • the curved convex direction of the curved pattern 22 coincides with the curved convex direction of the curved corner.
  • the utility model can effectively reduce the wrinkles at the curved corners of the diaphragm, reduce the high-order harmonic distortion, and improve the fatigue resistance of the folding ring, thereby improving the reliability margin of the product.
  • the inner side of the curved corner refers to the side close to the central portion 14 of the diaphragm.
  • the outer side of the curved corner refers to the side close to the diaphragm fixing portion 10.
  • the pattern 20a may be a concave pattern that is opposite to the convex direction of the folded ring portion 12, or a ridge pattern that is the same as the convex direction of the folded ring portion 12 may be employed. It is preferred that the pattern is disposed at the curved corner. In the practical application, the pattern may be disposed at a straight line segment of the folding ring portion, which is not limited in this embodiment.
  • the diaphragm may have a square structure, and the corresponding loop portion 12 is a square ring structure.
  • the loop portion 12 includes two opposite first sides.
  • the opposite two second sides and the curved corners connecting the first side and the second side are provided in four corners, and each of the curved corners is provided with a pattern 20a.
  • the diaphragm may also be a structure of other shapes, such as a racetrack-shaped structure.
  • the folding portion 12 includes opposite first and second sides, and connects the first side and The curved corner of the second side.
  • the loop is a ring-shaped structure of a corresponding shape.
  • the folding ring may be a racetrack-shaped annular structure, which is not limited in this embodiment.
  • the curved pattern 22 is provided with at least two, and at least two curved patterns 22 are along at least two concentric circles corresponding to the number of the curved patterns 22.
  • the track extends.
  • the curved pattern 22 is provided with four strips, and the four curved patterns 22 respectively extend along the trajectories of the four concentric circles. Further, the center of each concentric circle is located on the center portion 14. Further, the center of the four concentric circles overlaps with the center of the circle where the inner edge of the curved corner of the folded ring portion 12 is located, which can further suppress the rocking vibration of the product at a large displacement, and make the diaphragm more stable during vibration. And increase the smoothness of the diaphragm to obtain better low frequency performance.
  • the center of at least two concentric circles can be determined according to the following method. a first perpendicular perpendicular to the first side is formed at the intersection of the curved corner and the first side, and a second perpendicular perpendicular to the second side is formed at the junction of the curved corner and the second side, the first perpendicular The intersection of the second perpendicular is the center of the circle.
  • the center of the concentric circle can be determined by other methods, for example, arbitrarily selecting a point as a center of the circle or otherwise determining the center of the circle, which is not limited in this embodiment.
  • the number of the curved patterns 22 is designed according to the width of the curved pattern 22 and the width of the folded portion 12 and the required product performance, and is not limited to the above four, and the main point of the invention is the curve.
  • the shape and direction of the pattern, rather than the number of the curves 22, such as only the difference in the number of the strips, are also within the scope of the present invention.
  • each of the curved patterns 22 is smaller than the width of the central portion thereof, that is, each of the curved patterns 22 is approximately a crescent shape. Designing the curved pattern into a crescent shape can reduce the nonlinearity of the vibration, make the vibration more stable, and improve the reliability and sound quality of the microphone.
  • 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 arcuate corners of the loop portion 12 are distributed with a pattern 20b, and the pattern 20b includes a plurality of curved patterns 22 distributed on the inner side of the arcuate corners of the loop portion 12 and distributed over the fold ring. At least one rectilinear pattern 24a on the outer side of the arcuate corner of the portion 12.
  • the curved pattern 22 may also be disposed outside the curved corner, and the linear pattern 24a may be disposed inside the curved corner.
  • two curved patterns 22 are provided, and six straight patterns 24a are provided.
  • the six rectilinear patterns 24a are radially distributed from the inner side to the outer side of the arcuate corner.
  • the lengths of the six rectilinear patterns 24a may vary according to the position in which they are located. For example, the length of the rectilinear pattern 24a may be sequentially decreased from the middle to the both ends, that is, the rectilinear pattern 24a at the intermediate position has the longest length at both ends.
  • the linear pattern 24a at the edge position has the shortest length. In this way, the wrinkles of the diaphragm pattern during the vibration process can be improved, and the flatness and symmetry of the micro-sounder can be improved, thereby effectively reducing the harmonic distortion of the product and improving the sound quality.
  • the width of one end of the outer edge of the arc-shaped corner of the six straight-shaped pattern near the folding ring portion 12 is smaller than the width of one end of the inner edge of the arc-shaped corner, that is, each straight line
  • the pattern 24a is approximately in the shape of a drop. It can make the diaphragm vibrate more smoothly and obtain better low frequency performance.
  • the six rectilinear patterns 24a are symmetrically distributed with respect to the line between the midpoint of the inner edge of the arcuate corner of the bucking portion 12 and the midpoint of the outer edge. It can effectively reduce polarization and reduce harmonic distortion of products.
  • the curved pattern 22 and the linear pattern 24a do not interfere with each other.
  • the number of the curved pattern and the linear pattern in the present embodiment is not limited to the above two and six strips, only two curved patterns and six straight linear patterns are taken as an example, and the designer can The structure of the folded portion and the performance requirements of the product are modified, and the embodiment of the present invention does not limit this.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • This embodiment is basically the same as the first embodiment, and the difference is that:
  • the arcuate corners of the loop portion 12 are distributed with a pattern 20c including a curved pattern 22 distributed inside the arcuate corner of the loop portion 12 and distributed at the curved corners. At least one linear pattern on the outside.
  • the curved pattern 22 may also be disposed outside the curved corner, and the linear pattern 24b may be disposed inside the curved corner.
  • two curved patterns 22 are provided, and three straight patterns 24b are provided.
  • the three rectilinear patterns 24b are radially distributed from the outer edge of the loop portion 12 toward the curved pattern 22.
  • the lengths of the three rectilinear patterns 24b are unequal according to the position at which they are located, and the three rectilinear patterns 24b are symmetrically distributed with respect to the line between the midpoint of the inner edge of the arcuate corner of the loop portion 12 and the midpoint of the outer edge.
  • the two rectilinear patterns 24b at the edges are longer in length and extend to both ends of the curved pattern 22 on the outer side; the length of the linear pattern 24b in the middle is shorter, and the curved corners of the folded portion 12 are The midpoint of the outer edge extends toward the midpoint of the outer curve 22. In this way, it is also possible to improve the wrinkles of the diaphragm pattern during the vibration process, improve the flatness and symmetry of the microphone sound, thereby effectively reducing the harmonic distortion of the product and improving the sound quality.
  • the number of the curved pattern and the linear pattern in the embodiment is not limited to the above two and three, and only two curved patterns and three straight patterns are taken as an example, and the designer can The structure of the folded portion and the performance requirements of the product are modified, and the embodiment of the present invention does not limit this.
  • the invention is provided with a curved pattern on the folding ring portion which is substantially consistent with the direction of the folding ring portion, which effectively improves the stability of the vibration of the diaphragm, increases the smoothness of the diaphragm, reduces the generation of wrinkles, and improves The strength against fatigue can pass the reliability test.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • 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, the second embodiment and the third embodiment.
  • the micro-speaker of the present invention adopts the diaphragms described in the first embodiment, the second embodiment and the third embodiment, the noise is high, the sensitivity is high, the harmonic distortion is small, the sound quality is high, and the reliability margin is high. Great advantages.

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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，所述折环部包括弧形拐角，及由所述弧形拐角连接的第一边及第二边，所述弧形拐角上分布有花纹，在所述振膜的正投影面内，所述花纹包括至少一条曲线形花纹，且每条所述曲线形花纹由所述折环部的相邻的所述第一边向所述第二边方向延伸，每个所述弧形拐角处的所述曲线形花纹是由所述弧形拐角的内侧至外侧的方向依次排布。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。 (图2)

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长条状，且花纹的延伸方向与折环部的走向相垂直，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，抗疲劳能力高，能够提高微型发声器的可靠性余量。
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，可靠性余量大。
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，所述折环部包括弧形拐角，及由所述弧形拐角连接的第一边及第二边，所述弧形拐角上分布有花纹，在所述振膜的正投影面内，所述花纹包括至少一条曲线形花纹，且每条所述曲线形花纹由所述折环部的相邻的所述第一边向所述第二边方向延伸，每个所述弧形拐角处的所述曲线形花纹是由所述弧形拐角的内侧至外侧的方向依次排布。
其中，在所述振膜的正投影面内，所述曲线形花纹的曲线凸起方向与所述弧形拐角的曲线凸起方向一致。
其中，在所述振膜的正投影面内，所述花纹还包括至少一条直线形花纹；其中，所述曲线形花纹分布在所述弧形拐角的内侧或外侧，所述直线形花纹分布在所述弧形拐角的外侧或内侧。
其中，在所述振膜的正投影面内，所述直线形花纹在所述弧形拐角的内侧至外侧的方向上呈放射状分布或所述直线形花纹在所述弧形拐角的外侧至内侧的方向上呈放射状分布。
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外侧边缘的一端的宽度小于其靠近所述弧形拐角的内侧边缘的一端的宽度。
其中，在所述振膜的正投影面内，所述直线形花纹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，所述曲线形花纹设有至少两条，至少两条曲线形花纹是沿着与曲线形花纹数量相对应的至少两个同心圆的轨迹延伸。
其中，各所述同心圆的圆心位于所述中心部上。
其中，各所述同心圆的圆心与所述弧形拐角的内侧边缘所在圆的圆心重叠。
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，及由弧形拐角连接的第一边及第二边，弧形拐角上分布有花纹，在振膜的正投影面内，所述包括至少一条曲线形花纹，且每条曲线形花纹由第一边向第二边方向延伸，每个弧形拐角处的曲线形花纹是由弧形拐角的内侧至外侧的方向依次排布。。此种延伸方向由弧形拐角的一端向另一端延伸的花纹，即与折环部的走向基本一致的花纹与现有技术中的延伸方向与折环部的走向垂直的花纹相比具有如下优点：
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；
三、能够减小振膜角部褶皱的产生，能够有效的降低谐振频率处的高次谐波失真，同时还能够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5是本发明振膜实施例三的立体结构示意图；
图6是本发明振膜实施例三的正投影结构示意图；
图中：10、固定部，12、折环部，14、中心部，20a、花纹，20b、花纹，20c、花纹，22、曲线形花纹，24a、直线形花纹，24b、直线形花纹。
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的弧形拐角上分布有花纹20a，在振膜的正投影面内，花纹20a包括至少一条曲线形花纹22，且每条曲线形花纹22均由折环部12的相邻的第一边向第二边方向延伸，即每条曲线形花纹22均由弧形拐角的一端向另一端延伸。每个弧形拐角处的曲线花纹22均是由弧形拐角的内侧至外侧的方向依次排布。本实施方式优选曲线形花纹22的曲线凸起方向与弧形拐角的曲线凸起方向一致。能够有效的减小振膜的弧形拐角处的褶皱，降低高次谐波失真，提高折环的抗疲劳能力，从而提高产品的可靠性余量。
需要说明的是，弧形拐角的内侧是指靠近振膜中心部14的一侧。弧形拐角的外侧是指靠近振膜固定部10的一侧。
如图1和图2共同所示，花纹20a可以采用为与折环部12的凸起方向相反的凹花纹，也可以采用与折环部12的凸起方向相同的凸花纹。花纹设置在弧形拐角处为本实施方式的优选，实际应用中上述花纹还可以设置在折环部的直线段处，本实施例对此不做限制。
进一步的，如图1和图2共同所示，本实施方式优选振膜可以为方形结构，相应的折环部12为方环形结构，此时折环部12包括相对的两个第一边、相对的两个第二边以及连接第一边和第二边的弧形拐角，弧形拐角共设有四处，每处弧形拐角上均设置有花纹20a。
需要说明的是，在本实施方式中，振膜还可以是其他形状的结构，例如跑道形结构，此时，折环部12包括相对的第一边和第二边，以及连接第一边和第二边的弧形拐角。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，本实施例对此不做限制。
如图2所示，在振膜的正投影平面内，曲线形花纹22设有至少两条，至少两条曲线形花纹22是沿着与曲线形花纹22数量相对应的至少两个同心圆的轨迹延伸。
本实施方式优选曲线形花纹22设有四条，四条曲线花纹22分别沿着四个同心圆的轨迹延伸。进一步的，各同心圆的圆心位于中心部14上。更进一步的四个同心圆的圆心与折环部12的弧形拐角的内侧边缘所在的圆的圆心重叠，能够进一步的抑制产品在大位移时的摇摆振动，使振膜在振动时更加平稳，并增加振膜的顺性，获得更优的低频性能。
需要说明的是，至少两个同心圆的圆心可根据如下方法确定。在弧形拐角与第一边连接处做垂直于第一边的第一垂线，在弧形拐角与第二边的连接处做垂直于第二边的第二垂线，第一垂线与第二垂线的相交点即为圆心。当然，还可以通过其他方法确定同心圆的圆心，例如，任意选取一点作为圆心或是其他方式确定出圆心，本实施例对此不做限制。
需要说明的是，曲线形花纹22设置的条数根据曲线形花纹22的宽度及折环部12的宽度及所需的产品性能来设计，并不限于上述的四条，本发明的发明要点在于曲线形花纹的形状及延伸方向，而不在于曲线形花纹22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，各曲线形花纹22的两端部的宽度均小于其中心部的宽度，即各曲线形花纹22均近似为月牙形。将曲线形花纹设计成月牙形，能够减少振动的非线性，使得振动更平稳，能够提高微型发声器的可靠性和声音质量。
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，折环部12的弧形拐角分布有花纹20b，花纹20b包括分布在折环部12的弧形拐角的内侧的多条曲线形花纹22和分布在折环部12的弧形拐角的外侧的至少一条直线形花纹24a。实际应用中也可以将曲线形花纹22设置在弧形拐角的外侧，将直线形花纹24a设置在弧形拐角的内侧。
如图3和图4共同所示，本实施方式中曲线形花纹22设有两条，直线形花纹24a设有六条。在振膜的正投影面内，六条直线形花纹24a由弧形拐角的 内侧至外侧的方向上呈放射状分布。六条直线形花纹24a的长度根据所处的位置不等，例如，直线形花纹24a的长度可以从中间至两端依次递减，即为位于中间位置的直线形花纹24a的长度最长，位于两端边缘位置的直线形花纹24a的长度最短。这样，能够改善振动过程中振膜花纹出现褶皱，改善微型发声器顺性的平坦度及对称性，从而有效降低产品的谐波失真，提高声音质量。
进一步的，在振膜的正投影面内，六条直线形花纹靠近折环部12的弧形拐角的外侧边缘的一端的宽度均小于其靠近弧形拐角的内侧边缘一端的宽度，即各直线形花纹24a均近似为水滴状。能够使得振膜振动时更加平稳，获得更优的低频性能。
进一步的，六条直线形花纹24a相对于折环部12的弧形拐角的内边缘的中点与外边缘的中点之间的连线对称分布。能够有效的减轻偏振，降低产品的谐波失真。
如图3和图4共同所示，曲线形花纹22与直线形花纹24a相互之间不相干涉。
需要说明的是，本实施方式中曲线形花纹和直线形花纹的数量也不限于上述的两条和六条，仅是以曲线形花纹两条，直线形花纹六条为例进行说明，设计人员可以根据折环部的结构及产品的性能要求进行更改，本发明实施例对此不做限制。
实施例三：
本实施方式与实施例一基本相同，其不同之处在于：
如图5和图6共同所示，折环部12的弧形拐角分布有花纹20c，花纹20c包括分布在折环部12的弧形拐角的内侧的曲线形花纹22和分布在弧形拐角的外侧的至少一条直线形花纹。实际应用中也可以将曲线形花纹22设置在弧形拐角的外侧，将直线形花纹24b设置在弧形拐角的内侧。
如图5和图6共同所示，本实施方式中曲线形花纹22设有两条，直线形花纹24b设有三条。在振膜的正投影面内，三条直线形花纹24b由折环部12的外边缘向曲线形花纹22呈放射状分布。三条直线形花纹24b的长度根据所处的位置不等，三条直线形花纹24b相对于折环部12的弧形拐角的内边缘的 中点与外边缘的中点之间的连线对称分布，位于边缘的两条直线形花纹24b长度较长，分别延伸至位于外侧的曲线形花纹22的两端部；位于中间的直线形花纹24b的长度较短，由折环部12的弧形拐角的外侧边缘的中点向位于外侧的曲线形花纹22的中点延伸。这样，同样能够起到改善振动过程中振膜花纹出现褶皱，改善微型发声器顺性的平坦度及对称性，从而有效降低产品的谐波失真，提高声音质量的作用。
需要说明的是，本实施方式中曲线形花纹和直线形花纹的数量也不限于上述的两条和三条，仅是以曲线形花纹两条，直线形花纹三条为例进行说明，设计人员可以根据折环部的结构及产品的性能要求进行更改，本发明实施例对此不做限制。
本发明在折环部上设有延伸方向与折环部的走向基本一致的曲线形花纹，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。
实施例四：
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、实施例二和实施例三中描述的振膜。
由于本发明微型发声器采用了实施例一、实施例二和实施例三中描述的振膜，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，所述折环部包括弧形拐角，及由所述弧形拐角连接的第一边及第二边，所述弧形拐角上分布有花纹，其特征在于，在所述振膜的正投影面内，所述花纹包括至少一条曲线形花纹，且每条所述曲线形花纹由所述折环部的相邻的所述第一边向所述第二边方向延伸，每个所述弧形拐角处的所述曲线形花纹是由所述弧形拐角的内侧至外侧的方向依次排布。
  2. 根据权利要求1所述的振膜，其特征在于，在所述振膜的正投影面内，所述曲线形花纹的曲线凸起方向与所述弧形拐角的曲线凸起方向一致。
  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，所述花纹还包括至少一条直线形花纹；其中，所述曲线形花纹分布在所述弧形拐角的内侧或外侧，所述直线形花纹分布在所述弧形拐角的外侧或内侧。
  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，所述直线形花纹在所述弧形拐角的内侧至外侧的方向上呈放射状分布或所述直线形花纹在所述弧形拐角的外侧至内侧的方向上呈放射状分布。
  5. 根据权利要求4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外侧边缘的一端的宽度小于其靠近所述弧形拐角的内侧边缘的一端的宽度。
  6. 根据权利要求4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。
  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，所述曲线形花纹设有至少两条，至少两条曲线形花纹是沿着与曲线形花纹数量相对应的至少两个同心圆的轨迹延伸。
  8. 根据权利要求7所述的振膜，其特征在于，各所述同心圆的圆心位于所述中心部上。
  9. 根据权利要求7所述的振膜，其特征在于，各所述同心圆的圆心与所 述弧形拐角的内侧边缘所在圆的圆心重叠。
  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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