WO2017181536A1 - 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
WO2017181536A1
WO2017181536A1 PCT/CN2016/089370 CN2016089370W WO2017181536A1 WO 2017181536 A1 WO2017181536 A1 WO 2017181536A1 CN 2016089370 W CN2016089370 W CN 2016089370W WO 2017181536 A1 WO2017181536 A1 WO 2017181536A1
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diaphragm
film
layer
layers
thermoplastic elastomer
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French (fr)
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程真真
谷建华
吴增勋
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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
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
    • 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
    • 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
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • 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
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials

Definitions

  • the invention relates to the technical field of electroacoustic products, in particular to a composite diaphragm and a micro sound generator 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 rim portion, a loop portion and a ball top which are sequentially combined from the outside to the inside, and the diaphragm is a micro vocalizer.
  • 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 existing diaphragm is usually made of a single layer of TPU (Thermoplastic polyurethanes) or a TPEE (thermoplastic polyurethane elastomer) film, which has poor heat resistance, poor rigidity and low damping. It is easy to deform, resulting in poor stability of F0 (resonant frequency) of the micro-sounder, high total harmonic distortion, and poor sound quality, which is difficult to meet the high sound quality requirements of electronic devices.
  • TPU Thermoplastic polyurethanes
  • TPEE thermoplastic polyurethane elastomer
  • the first technical problem to be solved by the present invention is to provide a diaphragm which has good heat resistance and is not easily deformed, can improve the F0 stability of the micro-sounder, and reduce the total harmonics of the micro-speaker. distortion.
  • the second technical problem to be solved by the present invention is to provide a miniature sound generator, which has high stability, low total harmonic distortion, high sound quality, and can satisfy people's high electronic equipment. Sound quality requirements.
  • the technical solution of the present invention is:
  • a diaphragm comprising a multilayer composite structure comprising a thermoplastic elastomer layer and a film layer alternately stacked together.
  • the multilayer composite structure is three layers, and two layers of the thermoplastic elastomer are composed of The layer and a layer of the film layer are formed.
  • the multilayer composite structure is five layers composed of three layers of the thermoplastic elastomer layer and two layers of the film layer.
  • the multilayer composite structure is seven layers, and is composed of four layers of the thermoplastic elastomer layer and three layers of the film layer.
  • thermoplastic elastomer layer is one or more of a TPEE film, a TPU film and a TPAE film.
  • the thermoplastic elastomer layer has a thickness of 5 ⁇ m to 100 ⁇ m and a Young's modulus of 50 MPa to 500 MPa.
  • the film layer is one or more of an acrylic film and a silicone film.
  • the thickness of the film layer is from 1 ⁇ m to 100 ⁇ m.
  • the diaphragm has a thickness of 10 ⁇ m to 300 ⁇ m.
  • 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 diaphragm of the present invention is a multilayer composite structure
  • the multilayer composite structure includes a thermoplastic elastomer layer and a film layer which are alternately stacked together.
  • the diaphragm composed of the thermoplastic elastomer layer and the film layer has high rigidity and strong heat resistance, effectively improves the damping property of the micro-speaker, reduces the total harmonic distortion and damping coefficient of the micro-speaker, and maintains The long-term stability of F0 greatly improves the sound quality of the micro-speaker.
  • the diaphragm of the micro-speaker of the present invention is the above-mentioned diaphragm, the total harmonic distortion and the damping coefficient are reduced, and the stability of F0 is higher and the sound quality is higher, which can meet the requirements for high sound quality of electronic equipment.
  • the diaphragm of the present invention and the micro-speaker provided with the diaphragm solve the technical problems of unstable micro-speaker F0 and high total harmonic distortion in the prior art, the diaphragm of the present invention and the diaphragm provided thereon
  • the micro-sounder has low total harmonic distortion and damping coefficient, higher stability of F0 and high sound quality, which can meet people's requirements for high sound quality of electronic equipment.
  • FIG. 1 is a schematic cross-sectional structural view of a diaphragm according to an embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional structural view of a diaphragm according to an embodiment of the present invention
  • FIG. 3 is a schematic cross-sectional structural view of a three-diaphragm film according to an embodiment of the present invention.
  • edge portion 12, folding ring portion, 14, ball top, 20, thermoplastic elastomer layer, 22, film layer.
  • a diaphragm comprising a ball top portion 14, a loop portion 12 and an edge portion 10 that are sequentially joined from the inside to the outside.
  • the diaphragm is a multi-layer composite structure comprising a thermoplastic elastomer layer and a film layer alternately stacked together, that is, the thermoplastic elastomer layer is spaced apart from the film layer, and the total thickness is 10 ⁇ m to 300 ⁇ m, preferably 20 ⁇ m to 200 ⁇ m.
  • the thermoplastic elastomer layer is one or more of a TPEE film, a TPU film, and a TPAE (polyamide thermoplastic elastomer) film, but is not limited to the above three.
  • the thermoplastic elastomer layer has a thickness of 5 ⁇ m to 100 ⁇ m, preferably 5 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and a thermoplastic elastomer layer having a Young's modulus of 50 MPa to 500 MPa, preferably 80 MPa to 350 MPa.
  • the film layer is one or more of an acrylic film and a silicone film, and is not limited to the above two.
  • the thickness of the film layer is from 1 ⁇ m to 100 ⁇ m, preferably from 1 ⁇ m to 50 ⁇ m, and more preferably from 2 ⁇ m to 50 ⁇ m.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the diaphragm is a three-layer composite structure composed of two thermoplastic elastomer layers 20 and a film layer 22, the thermoplastic elastomer layer 20 is located on the surface, and the film layer 22 is sandwiched between two layers of thermoplastic elastomer. Between layers 20.
  • the two layers of thermoplastic elastomer layer 20 can be selected from the same material, such as one of TPEE film, TPU film or TPAE film, or two different materials, such as TPEE film and TPU film or TPU film and TPAE.
  • the film layer 22 is made of one of an acrylic film or a silicone film.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the diaphragm is a five-layer composite structure composed of three layers of thermoplastic elastomer layer 20 and two layers of film 22, while the thermoplastic elastomer layer 20 is on the surface, and the film layer 22 is in the middle and alternately stacked.
  • the three-layer thermoplastic elastomer layer 20 can be selected from the same material, such as one of TPEE film, TPU film or TPAE film, or two different materials or three different materials; two layers
  • the film layer 22 can be selected from the same material, such as one of an acrylic film or a silicone film, or two different materials, that is, one layer is an acrylic film and the other layer is a silicone film.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the diaphragm is a seven-layer composite structure composed of four layers of thermoplastic elastomer layer 20 and three layers of film layer 22.
  • the four layers of the thermoplastic elastomer layer 20 may all be selected from the same material or different materials; the three layers of the film layer 22 may also be selected from the same material or different materials.
  • the diaphragm of the invention is compounded by a thermoplastic elastomer layer and a rubber film layer, has large rigidity and strong heat resistance, effectively improves the damping property of the micro sounder, and reduces the total harmonic distortion and damping coefficient of the micro speaker.
  • the long-term stability of F0 is maintained, and the sound quality of the micro-speaker is greatly improved.
  • a micro sound generator comprising the above diaphragm comprises a vibration system and a magnetic circuit system, the vibration system comprises a diaphragm and a voice coil combined, and the diaphragm is a vibration composed of the thermoplastic elastomer layer and the rubber layer membrane.
  • the micro-sounder of the invention adopts the above composite diaphragm, the total harmonic distortion and the damping coefficient are reduced, the stability of the F0 is higher, the sound quality is higher, and the requirements for high sound quality of the electronic device can be satisfied.

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

Abstract

一种振膜及设有振膜的微型发声器，涉及电声产品技术领域，振膜为多层复合结构，多层复合结构包括交替叠加在一起的热塑性弹性体层（20）和胶膜层（22）。振膜及设有振膜的微型发声器解决了现有技术中微型扬声器F0不稳定，总谐波失真高等技术问题，振膜及设有振膜的微型发声器总谐波失真和阻尼系数低，F0稳定性更高，声音质量高，能够满足人们对电子设备高声音质量的要求。

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，特别涉及一种复合型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，振膜包括由外向内依次结合的边缘部、折环部和球顶部，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。
现有的振膜通常是由单层的TPU(Thermoplastic polyurethanes，热塑性聚氨酯弹性体橡胶)或TPEE(热塑性聚氨酯弹性体)薄膜制成，此种振膜耐热性较差，刚性差，阻尼性低，易变形，从而导致微型发声器的F0(谐振频率)稳定性差，总谐波失真高，声音质量较差，难以满足人们对电子设备高声音质量的要求。
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，此振膜耐热性好，不易变形，能够提高微型发声器的F0稳定性，降低微型发声器的总谐波失真。
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F0稳定性高，总谐波失真低，声音质量高，能够满足人们对电子设备高声音质量的要求。
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，所述振膜为多层复合结构，所述多层复合结构包括交替叠加在一起的热塑性弹性体层和胶膜层。
作为一种实施方式，所述多层复合结构为三层，由两层所述热塑性弹性体 层和一层所述胶膜层构成。
作为另一种实施方式，所述多层复合结构为五层，由三层所述热塑性弹性体层和两层所述胶膜层构成。
作为再一种实施方式，所述多层复合结构为七层，由四层所述热塑性弹性体层和三层所述胶膜层构成。
其中，所述热塑性弹性体层为TPEE薄膜、TPU薄膜和TPAE薄膜中的一种或多种。
其中，所述热塑性弹性体层的厚度为5μm～100μm，杨氏模量为50MPa～500Mpa。
其中，所述胶膜层为丙烯酸胶膜和硅胶膜中的一种或多种。
其中，所述胶膜层的厚度为1μm～100μm。
其中，所述振膜的厚度为10μm～300μm。
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：
由于本发明振膜为多层复合结构，该多层复合结构包括交替叠加在一起的热塑性弹性体层和胶膜层。此种由热塑性弹性体层和胶膜层构成的振膜，刚性大，耐热性强，有效的提高了微型发声器的阻尼性，降低了微型扬声器的总谐波失真和阻尼系数，保持了F0的长期稳定性，大大的提高了微型发声器的声音质量。
由于本发明微型发声器的振膜为上述振膜，从而降低了总谐波失真和阻尼系数，F0的稳定性更高，声音质量更高，能够满足人们对电子设备高声音质量的要求。
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微型扬声器F0不稳定，总谐波失真高等技术问题，本发明振膜及设有该振膜的微型发声器总谐波失真和阻尼系数低，F0稳定性更高，声音质量高，能够满足人们对电子设备高声音质量的要求。
附图说明
图1是本发明实施例一振膜的剖面结构示意图；
图2是本发明实施例二振膜的剖面结构示意图；
图3是本发明实施例三振膜的剖面结构示意图；
图中：10、边缘部，12、折环部，14、球顶部，20、热塑性弹性体层，22、胶膜层。
具体实施方式
下面结合附图和实施例，进一步阐述本发明。
一种振膜，包括由内向外依次结合的球顶部14、折环部12和边缘部10。该振膜为多层复合结构，此多层复合结构包括交替叠加在一起的热塑性弹性体层和胶膜层，即热塑性弹性体层与胶膜层间隔设置，总厚度为10μm～300μm，优选为20μm～200μm。
热塑性弹性体层为TPEE薄膜、TPU薄膜和TPAE(polyamide thermoplastic elastomer，聚酰胺热塑性弹性体)薄膜中的一种或多种，但并不限于上述的三种。热塑性弹性体层的厚度为5μm～100μm，优选为5μm～50μm，进一步优选为10μm～50μm；热塑性弹性体层的杨氏模量为50MPa～500Mpa，优选为80MPa～350Mpa。
胶膜层为丙烯酸胶膜和硅胶膜中的一种或多种，也不限于上述的两种。胶膜层的厚度为1μm～100μm，优选为1μm～50μm，进一步优选为2μm～50μm。
下面以几种具体的实施方式进一步简述上述技术方案：
实施方式一：
如图1所示，振膜为三层复合结构，由两层热塑性弹性体层20和一层胶膜层22构成，热塑性弹性体层20位于表面，胶膜层22夹在两层热塑性弹性体层20之间。其中：两层热塑性弹性体层20可以选用同一种材质，如TPEE薄膜、TPU薄膜或TPAE薄膜中的一种材质，也可以选用两种不同的材质，如TPEE薄膜和TPU薄膜或者TPU薄膜和TPAE薄膜等；胶膜层22选用丙烯酸胶膜或硅胶膜中的一种材质。
实施方式二：
如图2所示，振膜为五层复合结构，由三层热塑性弹性体层20和两层胶膜层22构成，依然是热塑性弹性体层20位于表面，胶膜层22位于中间并交替叠加设置。其中：三层热塑性弹性体层20可以选用同一种材质，如TPEE薄膜、TPU薄膜或TPAE薄膜中的一种材质，也可以选用其中的两种不同的材质，或者三种不同的材质；两层胶膜层22可以选用同一种材质，如丙烯酸胶膜或硅胶膜中的一种材质，或者是两种不同的材质，即一层为丙烯酸胶膜，另一层为硅胶膜。
实施方式三：
如图3所示，振膜为七层复合结构，由四层热塑性弹性体层20和三层胶膜层22构成。与前两种实施方式一样，四层热塑性弹性体层20可以都选用同一种材质，或者选用不同的材质；三层胶膜层22也同样可以都选用同一种材质，或者选用不同的材质。
本发明振膜由热塑性弹性体层和胶膜层共同复合而成，刚性大，耐热性强，有效的提高了微型发声器的阻尼性，降低了微型扬声器的总谐波失真和阻尼系数，保持了F0的长期稳定性，大大的提高了微型发声器的声音质量。
一种包含上述振膜的微型发声器，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，振膜为上述由热塑性弹性体层和胶膜层共同复合而成的振膜。
由于本发明微型发声器采用了上述复合振膜，从而降低了总谐波失真和阻尼系数，F0的稳定性更高，声音质量更高，能够满足人们对电子设备高声音质量的要求。
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，其特征在于，所述振膜为多层复合结构，所述多层复合结构包括交替叠加在一起的热塑性弹性体层和胶膜层。
  2. 根据权利要求1所述的振膜，其特征在于，所述多层复合结构为三层，由两层所述热塑性弹性体层和一层所述胶膜层构成。
  3. 根据权利要求1所述的振膜，其特征在于，所述多层复合结构为五层，由三层所述热塑性弹性体层和两层所述胶膜层构成。
  4. 根据权利要求1所述的振膜，其特征在于，所述多层复合结构为七层，由四层所述热塑性弹性体层和三层所述胶膜层构成。
  5. 根据权利要求2至4任一权利要求所述的振膜，其特征在于，所述热塑性弹性体层为TPEE薄膜、TPU薄膜和TPAE薄膜中的一种或多种。
  6. 根据权利要求5所述的振膜，其特征在于，所述热塑性弹性体层的厚度为5μm～100μm，杨氏模量为50MPa～500Mpa。
  7. 根据权利要求2至4任一权利要求所述的振膜，其特征在于，所述胶膜层为丙烯酸胶膜和硅胶膜中的一种或多种。
  8. 根据权利要求7所述的振膜，其特征在于，所述胶膜层的厚度为1μm～100μm。
  9. 根据权利要求2至4任一权利要求所述的振膜，其特征在于：所述振膜的厚度为10μm～300μm。
  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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