WO2015085697A1 - 一种扬声器振膜及其制造方法 - Google Patents

一种扬声器振膜及其制造方法 Download PDF

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Publication number
WO2015085697A1
WO2015085697A1 PCT/CN2014/076121 CN2014076121W WO2015085697A1 WO 2015085697 A1 WO2015085697 A1 WO 2015085697A1 CN 2014076121 W CN2014076121 W CN 2014076121W WO 2015085697 A1 WO2015085697 A1 WO 2015085697A1
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WO
WIPO (PCT)
Prior art keywords
silk cloth
coated
diaphragm
thermoplastic polyurethane
speaker diaphragm
Prior art date
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Ceased
Application number
PCT/CN2014/076121
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English (en)
French (fr)
Inventor
常秀丽
张永华
籍成宗
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Goertek Inc
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Goertek Inc
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Publication date
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Priority to KR1020167018407A priority Critical patent/KR101777832B1/ko
Priority to US15/103,231 priority patent/US9838817B2/en
Publication of WO2015085697A1 publication Critical patent/WO2015085697A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising 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
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • 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
    • H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
    • H04R2231/001—Moulding aspects of diaphragm or surround
    • 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
    • H04R2307/021—Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen
    • 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
    • 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
    • H04R2307/029—Diaphragms comprising fibres
    • 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

Definitions

  • the invention relates to the technical field of electroacoustic products, and in particular to a loudspeaker diaphragm and a manufacturing method thereof. Background technique
  • the single-layer speaker diaphragm has only the basic properties of the single-layer material itself, and it is difficult to meet the requirements of the speaker diaphragm.
  • the speaker diaphragm adopts a multi-layer material composite structure, but the diaphragm material selected is generally difficult to take into consideration both the rigidity and the damping characteristics of the diaphragm.
  • the diaphragm with relatively large rigidity is relatively small, and the diaphragm with relatively large damping is too rigid. Small, can not meet the requirements of the current speaker on the diaphragm, especially the tweeter. Therefore, it is necessary to improve the speaker diaphragm of this structure and its manufacturing method to avoid the above drawbacks. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a speaker diaphragm and a manufacturing method thereof, which can simultaneously take into consideration the rigidity and damping characteristics of the diaphragm and improve the acoustic performance of the diaphragm.
  • a speaker diaphragm including a ball top at a center position and a loop portion at an edge position, wherein the ball top, or the ball top and the
  • the folded ring portion includes a silk cloth and a thermoplastic polyurethane combined with the silk cloth, and the surface of the silk cloth is coated with a thermosetting glue.
  • the silk cloth and the thermoplastic polyurethane are thermocompression bonded. Further, preferably, both sides of the silk cloth are coated with the thermosetting glue.
  • the silk cloth is coated with the thermosetting glue only on one side surface.
  • thermosetting glue is located between the silk cloth and the thermoplastic polyurethane.
  • the silk cloth is located between the thermosetting glue and the thermoplastic polyurethane.
  • the silk cloth is coated under high temperature conditions, the glue is a thermosetting glue, and the colloid-coated silk cloth is baked.
  • step b Combine the glued silk cloth in step a with thermoplastic polyurethane to form a film; c. Press the film formed in step b to form a ball top at a high temperature, or press to form a ball top and a loop portion.
  • step c it is necessary to form two molds of the upper mold and the lower mold, and the thermoplastic resin is contacted with the upper mold during molding, and the lower mold is contacted with the silk cloth coated with the thermosetting rubber.
  • the temperature of the upper mold is not higher than the temperature of the lower mold.
  • thermosetting glue and the thermoplastic polyurethane in the film in a high temperature state are in a molten state.
  • the ball top of the speaker diaphragm of the present invention comprises a thermosetting glue-coated silk cloth and a thermoplastic polyurethane combined with the silk cloth in combination with the conventional structure,
  • the silk cloth is rigid after being glued, and the thermoplastic polyurethane has a large internal resistance. Therefore, the combined speaker diaphragm of the two materials has good rigidity and damping characteristics, thereby improving the acoustic performance of the diaphragm, especially high frequency. Acoustic performance.
  • FIG. 1 is a schematic perspective view showing a diaphragm of a diaphragm according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view of the diaphragm of Figure 1;
  • Figure 3 is a schematic enlarged view of the portion A shown in Figure 2;
  • FIG. 4 is a schematic perspective view showing the structure of a diaphragm according to an embodiment of the present invention.
  • Figure 5 is a cross-sectional view of the diaphragm of Figure 4.
  • Fig. 6 is an enlarged schematic view showing a portion B of Fig. 5.
  • the speaker diaphragm 1 is composed of two layers of materials, including a thermoplastic polyurethane 11 and a silk cloth 12 which is heat-compressed with the thermoplastic polyurethane 11, wherein the surface of the silk cloth 12 is coated with a curing glue.
  • the curing glue can increase the rigidity of the silk cloth 12.
  • the curing glue is a thermosetting glue, and the thermosetting glue is combined with the silk cloth to be solidified at a normal temperature to ensure the stability of the silk cloth after the glue is applied, wherein the diaphragm 1
  • the thermosetting glue is in a solid state during the working process.
  • the diaphragm 1 of this material has a large internal damping due to the thermoplastic polyurethane 11, and the silk cloth 12 has great rigidity after being coated with the thermosetting glue. Therefore, the diaphragm 1 has good rigidity and damping characteristics at the same time, which can be improved.
  • the silk cloth 12 can be coated with a thermosetting glue on one side or a thermosetting glue on both sides. Both structures can make the silk cloth have a certain rigidity, and the single-side rubber coating and the double-sided rubberized silk cloth 12 can be used. With different rigidity, it can be adjusted according to actual needs.
  • thermoplastic polyurethane 11 when the silk cloth 12 is coated with the thermosetting glue on one side, the thermoplastic polyurethane 11 may be bonded to one side surface of the silk cloth 12 coated with the thermosetting glue, and the thermosetting glue is located on the silk cloth 12 and the thermoplastic The thermoplastic polyurethane 11 may also be bonded to one side surface of the silk cloth 12 not coated with the thermosetting glue, and the silk cloth 12 is located between the thermosetting glue and the thermoplastic polyurethane 11.
  • the diaphragm 1 of the present embodiment includes a ball top I at a central position and a folded portion II at an edge position.
  • the preferred ball top I and the folded portion II are each made of the above-mentioned thermoplastic polyurethane 11 and a cured rubber-coated silk cloth 12
  • the diaphragm structure after hot pressing composite is both of the same material structure, which can be used for the molding process of the product, and since the diaphragm 1 can simultaneously take into consideration the rigidity and damping characteristics of the diaphragm 1, It is beneficial to improve the acoustic performance of the speaker, especially the acoustic performance of the tweeter.
  • the manufacturing method of the speaker diaphragm of the present invention is as follows:
  • the silk cloth is coated under high temperature conditions, and the silk cloth is coated with glue to dry the glued silk cloth, wherein the glue is a thermosetting glue;
  • step b The silk cloth 12 after the glued in step a is thermocompression bonded to the thermoplastic polyurethane 11 at a high temperature.
  • step b The film formed in step b is pressed at a high temperature to form a ball top I and a folded portion I I .
  • the two molds of the upper mold and the lower mold are required to be formed, and the thermoplastic resin is contacted with the upper mold during molding, and the lower mold is contacted with the silk cloth coated with the thermosetting rubber;
  • the temperature of the upper mold is not higher than the temperature of the lower mold.
  • the upper mold and the lower mold press the diaphragm, and at a high temperature, the diaphragm can be molded in a few seconds to ten seconds.
  • step c the thermosetting glue and the thermoplastic polyurethane 11 in the film are both molten at a high temperature, and then pressed to form the ball top I and the folded portion I I of the diaphragm of a specific shape.
  • the thermoplastic polyurethane has a melting temperature of about 150 ° C.
  • the temperature in the above method for fabricating the speaker diaphragm can be controlled within a range of 150-230 C, preferably 170-230 ° C, for example, controlled at 180. ° (:, 200 ° C 210 ° (:.
  • the silk cloth can be coated on both sides, or only one side.
  • the thermoplastic polyurethane 11 can Combined with the surface of the silk cloth coated on one side, it can also be combined with the uncoated side surface of the silk cloth.
  • the manufacturing method of the speaker diaphragm can make the thickness of each part of the diaphragm uniform and ensure the performance of the diaphragm.
  • the rear diaphragm has good rigidity and damping characteristics, which is beneficial to improve the acoustic performance of the diaphragm.
  • the diaphragm 1 of the speaker includes a ball top I at a central position and a folded portion II at an edge position, wherein the ball top I includes a silk cloth 12 coated with thermosetting glue and The silk cloth 12 is thermocompression bonded with thermoplastic polyurethane 11, and the thermosetting glue is not shown.
  • the folding ring portion I I adopts other structures, and the ball top portion I and the folding ring portion I I are not fixedly integrated by gluing or the like.
  • the rubberized silk cloth 12 has good rigidity, and the thermoplastic polyurethane 11 has large internal damping.
  • the spherical top I of the diaphragm 1 ' has good rigidity and damping characteristics at the same time, and the diaphragm 1 can be significantly improved. 'Acoustic characteristics, especially high frequency acoustic performance.
  • the silk cloth 12 can be a single-sided or double-sided adhesive structure.
  • the speaker diaphragm is manufactured as follows:
  • the silk cloth is coated under high temperature conditions, and the silk cloth is coated with glue to dry the glued silk cloth, wherein Description
  • This glue is a thermosetting glue
  • step b The film formed in step b is pressed at a high temperature to form the top of the ball I.
  • the two molds of the upper mold and the lower mold are required to be formed, and the thermoplastic resin is contacted with the upper mold during molding, and the lower mold is contacted with the silk cloth coated with the thermosetting rubber;
  • the temperature of the upper mold is not higher than the temperature of the lower mold.
  • the upper mold and the lower mold press the diaphragm, and at a high temperature, the diaphragm can be molded in a few seconds to ten seconds.
  • step c the thermosetting glue and the thermoplastic polyurethane 11 in the film are both molten at a high temperature, and then pressed to form a ball top I of a diaphragm of a specific shape.
  • the melting temperature of the thermoplastic polyurethane is about 150 ° C
  • the temperature in the method for fabricating the speaker diaphragm can be controlled within a range of 150-230 ° C, preferably in the range of 170-230 ° C, for example, can be controlled 180° (:, 200°C 210° (:.
  • the silk cloth can be coated on both sides, or only one side.
  • thermoplastic polyurethane 11 It can be combined with the side surface of the silk cloth coated with rubber, or it can be combined with the uncoated side surface of the silk cloth.
  • the manufacturing method of the speaker diaphragm can make the thickness of each part of the diaphragm uniform and ensure the performance of the diaphragm.
  • the formed diaphragm ball top has good rigidity and damping characteristics, which is beneficial to improve the acoustic performance of the diaphragm.

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

Abstract

　一种扬声器振膜，包括位于中心位置的球顶部和位于边缘位置的折环部，球顶部和/或折环部包括蚕丝布和与所述蚕丝布结合的热塑性聚氨酯，蚕丝布的表面涂布有热固胶。上述扬声器振膜的制造方法，包括如下步骤：a．将蚕丝布在高温条件下涂布热固胶，将涂布有胶体的蚕丝布烘干；b．将步骤a中涂布热固胶后的蚕丝布与热塑性聚氨酯热压结合，形成膜片；c．将步骤b中形成的膜片在高温下压制形成球顶部或折环部，或者压制形成球顶部和折环部。本发明扬声器振膜的球顶部，或者球顶部和折环部包括涂有热固胶的蚕丝布和与蚕丝布结合热压结合的热塑性聚氨酯，这两种材料结合后的扬声器振膜具有良好的刚性和阻尼特性，因此可以提升振膜的声学性能。

Description

说 明 书
一种扬声器振膜及其制造方法 技术领域
本发明涉及电声产品技术领域， 特别涉及一种扬声器振膜及其制造方法。 背景技术
单层结构的扬声器振膜仅具有单层材料本身的基本属性， 难以达到扬声器 振膜的要求。 目前扬声器振膜采用多层材料复合的结构， 但是选用的振膜材料 通常难以同时兼顾振膜的刚性和阻尼特性，通常刚性比较大的振膜阻尼比较小， 而阻尼比较大的振膜刚性太小， 均无法满足目前扬声器对振膜的要求， 尤其是 高频扬声器。 因此， 有必要对这种结构的扬声器振膜及其制造方法进行改进， 以避免上述缺陷。 发明内容
本发明所要解决的技术问题是提供一种扬声器振膜及其制造方法， 可以同 时兼顾振膜的刚性和阻尼特性， 提升振膜的声学性能。
为解决上述技术问题， 本发明的技术方案是： 一种扬声器振膜， 包括位于 中心位置的球顶部和位于边缘位置的折环部， 其中， 所述球顶部， 或者所述球 顶部和所述折环部包括蚕丝布和与所述蚕丝布结合的热塑性聚氨酯， 所述蚕丝 布的表面涂布有热固胶。
此外，优选的方案是，所述蚕丝布与所述热塑性聚氨酯为热压结合的结构。 此外， 优选的方案是， 所述蚕丝布的两侧表面均涂布有所述热固胶。
此外， 优选的方案是， 所述蚕丝布仅一侧表面涂有所述热固胶。
此外， 优选的方案是， 所述热固胶位于蚕丝布与热塑性聚氨酯之间。
此外， 优选的方案是， 所述蚕丝布位于热固胶与热塑性聚氨酯之间。
一种上述扬声器振膜的制造方法， 其中， 包括如下步驟：
将蚕丝布在高温条件下涂胶， 所述胶为热固胶， 将涂有胶体的蚕丝布烘 说 明 书 干；
b. 将步驟 a中涂胶后的蚕丝布与热塑性聚氨酯热压结合， 形成膜片； c 将步驟 b中形成的膜片在高温下压制形成球顶部， 或者压制形成球顶部 和折环部。
此外， 优选的方案是， 在步驟 c中， 需要采用上模和下模两个模具成型， 成型时接触上模的为热塑性聚氨酯， 下模接触涂有热固胶的蚕丝布。
此外， 优选的方案是， 所述上模的温度不高于所述下模的温度。
此外， 优选的方案是， 在步驟 C中， 高温状态下的所述膜片中的热固胶和 热塑性聚氨酯均为熔融状态。
采用上述技术方案后， 与传统结构相比， 本发明扬声器振膜的球顶部， 或 者球顶部和折环部包括涂有热固胶的蚕丝布和与蚕丝布结合热压结合的热塑性 聚氨酯， 由于蚕丝布涂胶后具有刚性， 热塑性聚氨酯具有较大的内阻， 因此这 两种材料结合后的扬声器振膜具有良好的刚性和阻尼特性， 因此可以提升振膜 的声学性能， 特别是高频的声学性能。 附图说明
通过下面结合附图对本发明进行描述， 本发明的上述特征和技术优点将会 变得更加清楚和容易理解。
图 1是本发明实施例一振膜的立体结构示意图；
图 2是图 1所示振膜的剖面图；
图 3是图 2所示 A部分的放大结构示意图；
图 4是本发明实施例二振膜的立体结构示意图；
图 5是图 4所示振膜的剖面图；
图 6是图 5所示 B部分的放大结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步详细的描述 说 明 书 实施例一：
如图 1至图 3所示， 扬声器振膜 1 由两层材料复合而成， 包括热塑性聚氨 酯 11和与热塑性聚氨酯 11热压复合的蚕丝布 12，其中蚕丝布 12的表面涂布有 固化胶， 图中未显示。 固化胶可以使蚕丝布 12的刚性加大， 优选的， 固化胶为 热固胶， 热固胶与蚕丝布结合后在常温下会固化， 以保证蚕丝布涂胶后的稳定 性， 其中振膜 1 工作过程中热固胶为固体状态。 这种材料的振膜 1， 由于热塑 性聚氨酯 11具有较大的内阻尼， 蚕丝布 12涂布热固胶后具有很大的刚性， 因 此， 振膜 1 同时具有良好的刚性和阻尼特性， 可提升振膜 1的声学性能， 特别 是高频的声学特性。
其中， 蚕丝布 12可以单面涂布热固胶， 也可以双面涂布热固胶， 两种结构 均可以使蚕丝布具有一定的刚性，单面涂胶和双面涂胶的蚕丝布 12具有不同的 刚性， 可根据实际需要进行调整。
其中， 当蚕丝布 12单面涂布热固胶时， 所述热塑性聚氨酯 11 可以结合于 蚕丝布 12涂布有所述热固胶的一侧表面， 所述热固胶位于蚕丝布 12与热塑性 聚氨酯 11之间； 所述热塑性聚氨酯 11也可以结合于蚕丝布 12未涂布有所述热 固胶的一侧表面， 所述蚕丝布 12位于热固胶与热塑性聚氨酯 11之间。
本实施例振膜 1包括位于中心位置的球顶部 I和位于边缘位置的折环部 I I , 优选的球顶部 I和折环部 I I均采用上述由热塑性聚氨酯 11和涂固化胶后的蚕丝 布 12热压复合后的振膜结构。这样扬声器振膜 1的球顶部 I和折环部 I I均采用 同一种材料的结构， 可以筒化产品的成型工艺， 而且由于这种振膜 1可以同时 兼顾振膜 1的刚性和阻尼特性， 有利于提高扬声器的声学性能， 特别是高频扬 声器的声学性能。
本发明这种扬声器振膜的制造方法如下：
将蚕丝布在高温条件下涂胶， 蚕丝布涂胶后对涂胶的蚕丝布烘干， 其中 这种胶为热固胶；
b . 将步驟 a中涂胶后的蚕丝布 12与热塑性聚氨酯 11在高温下热压结合， 说 明 书
形成膜片；
c 将步驟 b中形成的膜片在高温下压制形成球顶部 I和折环部 I I。
其中， 步驟 c在成型的过程中， 需要采用上模和下模两个模具成型， 成型 时接触上模的为热塑性聚氨酯， 下模接触涂有热固胶的蚕丝布； 由于热塑性聚 氨酯的熔点低于热固胶的熔点， 优选的， 上模的温度不高于下模的温度。 上模 和下模对膜片进行压制， 高温下， 控制在几秒到十几秒内振膜即可成型。
其中，在步驟 c中膜片中的热固胶和热塑性聚氨酯 11在高温下均为熔融状 态， 然后压制形成特定形状的振膜的球顶部 I和折环部 I I。 所述热塑性聚氨酯 的熔融温度大约为 150°C , 上述扬声器振膜的制作方法中的温度可控制在 150-230 C的范围内， 优选为 170-230°C的范围内， 例如可控制在 180° (：、 200°C 210° (：。 在步驟 a中蚕丝布可以双面均涂胶， 或者仅单面涂胶。 蚕丝布仅单面涂 胶时，在步驟 b中， 热塑性聚氨酯 11可以结合在蚕丝布涂胶的一侧表面， 也可 以结合在蚕丝布未涂胶的一侧表面。 这种扬声器振膜的制造方法可以使振膜各 部分的厚薄均匀，保证振膜的性能，成型后的振膜具有良好的刚性和阻尼特性， 有利于提高振膜的声学性能。 实施例二：
如图 4至图 6所示， 扬声器的振膜 1， 包括位于中心位置的球顶部 I和位 于边缘位置的折环部 I I ,其中球顶部 I 包括涂布有热固胶的蚕丝布 12和与蚕丝 布 12热压结合的热塑性聚氨酯 11 , 图中热固胶未显示。 其中， 折环部 I I采用 其他结构， 未采用上述球顶部 I和折环部 I I通过涂胶等方式固定结合为一体。 涂胶后的蚕丝布 12具有良好的刚性， 热塑性聚氨酯 11具有较大的内阻尼， 两 者结合后振膜 1 ' 的球顶部 I 同时具有良好的刚性和阻尼特性， 可以显著的提 升振膜 1 ' 的声学特性， 尤其高频的声学性能。
同样， 根据产品的具体需要蚕丝布 12可以为单面涂胶或双面涂胶的结构。 这种扬声器振膜的制作方法如下：
将蚕丝布在高温条件下涂胶， 蚕丝布涂胶后对涂胶的蚕丝布烘干， 其中 说 明 书
这种胶为热固胶；
b . 将步驟 a中涂胶后的蚕丝布 12与热塑性聚氨酯 11在高温下热压结合， 形成膜片；
c 将步驟 b中形成的膜片在高温下压制形成球顶部 I。
其中， 步驟 c在成型的过程中， 需要采用上模和下模两个模具成型， 成型 时接触上模的为热塑性聚氨酯， 下模接触涂有热固胶的蚕丝布； 由于热塑性聚 氨酯的熔点低于热固胶的熔点， 优选的， 上模的温度不高于下模的温度。 上模 和下模对膜片进行压制， 高温下， 控制在几秒到十几秒内振膜即可成型。
其中，在步驟 c中膜片中的热固胶和热塑性聚氨酯 11在高温下均为熔融状 态， 然后压制形成特定形状的振膜的球顶部 I。 所述热塑性聚氨酯的熔融温度 大约为 150°C , 上述扬声器振膜的制作方法中的温度可控制在 150-230°C的范围 内， 优选为 170-230°C的范围内， 例如可控制在 180° (：、 200°C 210° (：。 在步驟 a中蚕丝布可以双面均涂胶， 或者仅单面涂胶。 蚕丝布仅单面涂胶时， 在步驟 b 中， 热塑性聚氨酯 11可以结合在蚕丝布涂胶的一侧表面， 也可以结合在蚕丝布 未涂胶的一侧表面。这种扬声器振膜的制造方法可以使振膜各部分的厚薄均匀， 保证振膜的性能， 成型后的振膜球顶部具有良好的刚性和阻尼特性， 有利于提 高振膜的声学性能。
在本发明的上述教导下， 本领域技术人员可以在上述实施例的基础上进行 其他的改进和变形， 而这些改进和变形， 都落在本发明的保护范围内， 本领域 技术人员应该明白， 上述的具体描述只是更好的解释本发明的目的， 本发明的 保护范围由权利要求及其等同物限定。

Claims

权 利 要 求 书
1.一种扬声器振膜， 包括位于中心位置的球顶部和位于边缘位置的折环部， 其特征在于， 所述球顶部， 或者所述球顶部和所述折环部包括蚕丝布和与所述 蚕丝布结合的热塑性聚氨酯， 所述蚕丝布的表面涂布有热固胶。
2. 根据权利要求 1所述的扬声器振膜， 其特征在于， 所述蚕丝布与所述热 塑性聚氨酯为热压结合的结构。
3. 根据权利要求 1或 2所述的扬声器振膜， 其特征在于， 所述蚕丝布的两 侧表面均涂布有所述热固胶。
4. 根据权利要求 1或 2所述的扬声器振膜， 其特征在于， 所述蚕丝布仅一 侧表面涂布有所述热固胶。
5. 根据权利要求 4所述的扬声器振膜， 其特征在于， 所述热固胶位于蚕丝 布与热塑性聚氨酯之间。
6. 根据权利要求 4所述的扬声器振膜， 其特征在于， 所述蚕丝布位于热固 胶与热塑性聚氨酯之间。
7. 根据权利要求 1至 6任一权利要求所述的扬声器振膜的制造方法， 其特 征在于， 包括如下步驟：
将蚕丝布在高温条件下涂胶， 所述胶为热固胶， 将涂有胶体的蚕丝布烘 干；
b. 将步驟 a中涂胶后的蚕丝布与热塑性聚氨酯热压结合， 形成膜片； c 将步驟 b中形成的膜片在高温下压制形成球顶部或折环部， 或者压制形 成球顶部和折环部。
8. 根据权利要求 7所述的扬声器振膜的制造方法， 其特征在于， 在步驟 c 中， 需要采用上模和下模两个模具成型， 成型时接触上模的为热塑性聚氨酯， 下模接触涂有热固胶的蚕丝布。
9. 根据权利要求 8所述的扬声器振膜的制造方法， 其特征在于， 所述上模 的温度不高于所述下模的温度。
10. 根据权利要求 7所述的扬声器振膜的制造方法， 其特征在于， 在步驟 c 中， 高温状态下的所述膜片中的热固胶和热塑性聚氨酯均为熔融状态。
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