WO2020133365A1 - 一种球顶材料、振膜及扬声器 - Google Patents

一种球顶材料、振膜及扬声器 Download PDF

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Publication number
WO2020133365A1
WO2020133365A1 PCT/CN2018/125373 CN2018125373W WO2020133365A1 WO 2020133365 A1 WO2020133365 A1 WO 2020133365A1 CN 2018125373 W CN2018125373 W CN 2018125373W WO 2020133365 A1 WO2020133365 A1 WO 2020133365A1
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Prior art keywords
layer
resin
fiber
film layer
dome material
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PCT/CN2018/125373
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English (en)
French (fr)
Inventor
马利鹏
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AAC Technologies Holdings Shenzhen Co Ltd
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AAC Acoustic Technologies Shenzhen Co Ltd
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Priority to PCT/CN2018/125373 priority Critical patent/WO2020133365A1/zh
Publication of WO2020133365A1 publication Critical patent/WO2020133365A1/zh
Anticipated expiration legal-status Critical
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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
    • 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
    • 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 belongs to the technical field of sound generators, and particularly relates to a dome material, a diaphragm and a speaker.
  • the diaphragm mostly includes the diaphragm body and the dome attached to the center of the diaphragm
  • the dome usually adopts sandwich structure of aluminum foil + polymethacrylimide foam (PMI) + aluminum foil, but the high-frequency cut-off frequency of the aluminum foil dome of the sandwich structure is usually within 8.5KHz, which cannot meet people's treble of speakers Partial acoustic performance requirements.
  • PMI polymethacrylimide foam
  • the dome material of the prior art has a low high-frequency cutoff frequency, which cannot meet people's demand for the acoustic performance of the tweeter part of the speaker.
  • a dome material includes: an intermediate layer, an adhesive layer, a film layer and a surface layer.
  • the adhesive layer, the film layer and the surface layer are in this order Laminated on the intermediate layer, and the adhesive layer, the film layer and the surface layer are stacked on both sides of the intermediate layer;
  • the intermediate layer is made of foamed material, the foamed
  • the density of the material is in the range of 0.05-0.50g/cm 3 ;
  • the thickness of the adhesive layer is within 3-20 ⁇ m;
  • the film layer is bonded to the intermediate layer by the adhesive layer, the film layer
  • the thickness is within 2-20 ⁇ m;
  • the surface layer is formed by unidirectional arrangement of fiber prepreg, the fiber prepreg includes fiber and resin, the weight content of the resin is within 20%-50%, the The area density of fiber prepreg is in the range of 10-100g/m 2 .
  • the intermediate layer includes any one of PMI, MCPET, PI, PAI, and PPS, or a combination of any plurality of materials.
  • the thickness of the adhesive layer is in the range of 5-15 ⁇ m.
  • the adhesive layer uses an adhesive, and the adhesive includes any one or any combination of epoxy resin, phenol resin, acrylic resin, and silica gel.
  • the thickness of the thin film layer is in the range of 5-15 ⁇ m.
  • the thin film layer includes one or any combination of aluminum foil, magnesium-lithium alloy foil, titanium foil, PI, LCP, PET, and PEN.
  • the resin includes any one or a combination of any one of epoxy resin, phenol resin, polyamide resin, PEEK, PI, and PEI.
  • the fiber includes any one or a combination of any one of carbon fiber, glass fiber, aramid fiber and basalt fiber.
  • a diaphragm is provided, which is formed by cutting the dome material as described above.
  • a speaker which includes the diaphragm as described above.
  • the middle layer of the dome material of the present invention uses a foam material, and an adhesive layer, a film layer, and a surface layer are sequentially stacked on both sides of the middle layer outward, and the surface layer uses a fiber prepreg, which can enhance the dome
  • the quality of the material; the diaphragm and the loudspeaker using the dome material of the present invention can raise the high-frequency cut-off frequency to 10KHz, thereby meeting people's demand for the acoustic performance of the treble part of the loudspeaker.
  • FIG. 1 is a schematic structural view of a dome material in an embodiment of the present invention.
  • each reference sign indicates: 1. Intermediate layer; 2. Adhesive layer; 3. Film layer; 4. Surface layer.
  • the speaker includes a diaphragm, which is formed by cutting the dome material.
  • the dome material includes: an intermediate layer 1, an adhesive layer 2, a thin film layer 3, and a surface layer 4,
  • the adhesive layer 2, the film layer 3, and the surface layer 4 are sequentially stacked on the intermediate layer 1, and the adhesive layer 2, the film layer 3, and the surface layer 4 are stacked on both sides of the intermediate layer 1;
  • Foam material the density range of the foam material is within 0.05-0.50g/cm 3 ;
  • the thickness of the adhesive layer 2 is within 3-20 ⁇ m;
  • the film layer 3 is bonded to the intermediate layer 1 by the adhesive layer 2 and the film layer 3
  • the thickness is within 2-20 ⁇ m;
  • surface layer 4 is formed by unidirectional arrangement of fiber prepreg, fiber prepreg includes fiber and resin, the weight content of resin is within 20%-50%, the surface density of fiber prepreg The range is 10-100g/m 2 .
  • the middle layer 1 of the dome material is made of foamed material, and the adhesive layer 2, the film layer 3 and the surface layer 4 are sequentially stacked on both sides of the middle layer 1 outward, and the surface layer 4 is made of fiber prepreg.
  • Improve the quality of the dome material; the diaphragm and speaker using the dome material of the present invention can increase the high-frequency cutoff frequency to 10 KHz, thereby meeting people's demand for the acoustic performance of the treble part of the speaker.
  • the foam material is preferably a rigid foam material
  • the density of the foam material may be, for example, 0.05 g/cm 3 , 0.10 g/cm 3 , 0.15 g/cm 3 , 0.20 g/cm 3 , 0.25g/cm 3 , 0.30g/cm 3 , 0.35g/cm 3 , 0.40g/cm 3 , 0.45g/cm 3 , 0.50g/cm 3, etc.
  • the intermediate layer 1 may include PMI (polymethacryloyl Imine foam), MCPET (microfoamed reflector: MicroCellularPET), PI (polyimide: Polyimide), PAI (amide-based plastic: Polyamideimide) and PPS (polyphenylene sulfide plastic: Phenylenesulfide), etc. Materials, or any combination of multiple materials, in other embodiments, the intermediate layer 1 may also include one of polystyrene, rigid polyurethane,
  • the thickness of the adhesive layer 2 can be in the range of 5-15 ⁇ m, for example: 5 ⁇ m, 6 ⁇ m, 7 ⁇ m, 8 ⁇ m, 9 ⁇ m, 10 ⁇ m, 11 ⁇ m, 12 ⁇ m, 13 ⁇ m, 14 ⁇ m or 15 ⁇ m, etc.
  • the thickness range of the adhesive layer 2 can also be in Within 3-5 ⁇ m, such as: 3 ⁇ m, 4 ⁇ m, or 5 ⁇ m, etc., the thickness of the adhesive layer 2 may also be within 15-20 ⁇ m, such as: 16 ⁇ m, 17 ⁇ m, 18 ⁇ m, 19 ⁇ m, or 20 ⁇ m.
  • the adhesive layer 2 uses an adhesive.
  • the adhesive may include any one or any combination of epoxy resin, phenolic resin, acrylic resin, and silica gel; of course, the adhesive is used In order to bond and fix the intermediate layer 1 and the film layer 3, any material that can bond and fix the intermediate layer 1 and the film layer 3 may be used.
  • the adhesive may also include cellulose ester , Vinyl polymer, polyether, polyamide, phenolic-butyronitrile rubber, phenolic-chloroprene rubber, phenolic-polyurethane rubber, epoxy-butyronitrile rubber, epoxy-polysulfide rubber, etc.kinds of combinations.
  • the thickness of the thin film layer 3 can be in the range of 5-15 ⁇ m, for example: 5 ⁇ m, 6 ⁇ m, 7 ⁇ m, 8 ⁇ m, 9 ⁇ m, 10 ⁇ m, 11 ⁇ m, 12 ⁇ m, 13 ⁇ m, 14 ⁇ m or 15 ⁇ m, etc.
  • the thickness of the thin film layer 3 can also be in the range of 2- Within 5 ⁇ m, for example: 2 ⁇ m, 3 ⁇ m, 4 ⁇ m, 5 ⁇ m, etc., the thickness of the thin film layer 3 may also be within 15-20 ⁇ m, for example: 16 ⁇ m, 17 ⁇ m, 18 ⁇ m, 19 ⁇ m, 20 ⁇ m, or the like.
  • the film layer 3 is made of a high modulus material, and the film layer 3 includes aluminum foil, magnesium-lithium alloy foil, titanium foil, PI (polyimide: Polyimide), LCP (liquid crystal polymer: Liquid Crystal Polymer) ), PET (polyethylene terephthalate plastics: Polyethyleneterephthalate) and PEN (PolyethyleneNaphthalate: polyethylene naphthalate) one or any combination of multiple; in other embodiments, the film layer 3 may also It includes one or more of lithium aluminum alloy foil, magnesium aluminum alloy foil, or PPE (polyphenylene ether).
  • the weight content of the resin may be, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% , 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47 %, 48%, 49%, 50%, etc.
  • the area density of the fiber prepreg may be, for example: 10g/m 2 , 15g/m 2 , 20g/m 2 , 25g/m 2 , 30g/m 2 , 35g/ m 2 , 40g/m 2 , 45g/m 2 , 50g/m 2 , 55g/m 2 , 60g/m 2 , 65g/m 2 , 70g/m 2 , 75g/m 2 , 80g/m 2 , 85g/ m 2 , 90g/m 2 , 95g/
  • the resin may include epoxy resin, phenol resin, polyamide resin, PEEK (polyetheretherketone: polyetheretherketone), PI (polyimide: Polyimide), and PEI (polyetherimide: Polyetherimide) Any one or any combination of any of the above; in other embodiments, the resin may also include one or more of polypropylene (PP), polycarbonate (PC), polyethersulfone (PES), etc. The combination.
  • the fiber is a high modulus fiber, and the fiber may include any one or any combination of carbon fiber, glass fiber, aramid fiber, basalt fiber, etc.
  • it may be: polyacrylonitrile Carbon fiber, pitch-based carbon fiber, PBO fiber (poly-p-phenylene benzobisthiazole fiber: Poly-p-phenylenebenzobisthiazole), poly-p-phenylene terephthalamide, PE fiber, AR glass fiber, high-strength glass fiber and Any one or any combination of E-glass fibers and the like.

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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

本发明提供了一种球顶材料、振膜及扬声器，扬声器包括振膜，振膜由球顶材料制成，球顶材料包括：中间层(1)和依次层叠设置在中间层(1)上的胶黏层(2)、薄膜层(3)和表面层(4)，中间层(1)采用发泡材料，发泡材料的密度范围在0.05-0.50g/cm 3内；胶黏层(2)的厚度在3-20μm以内；薄膜层(3)由胶黏层(2)粘结在中间层(1)上，薄膜层(3)的厚度在2-20μm以内；纤维预浸料包括纤维和树脂，树脂的重量含量在20%-50%内，纤维预浸料的面密度范围在0-100g/m 2。本发明的球顶材料的振膜和扬声器能提升高频截止频率以满足人们对高音部分声学性能的需求。

Description

一种球顶材料、振膜及扬声器 技术领域
本发明属于发声器技术领域，尤其涉及一种球顶材料、振膜及扬声器。
 背景技术
随着移动互联网时代的到来，智能移动设备的数量不断上升。而在众多移动设备之中，手机无疑是最常见、最便携的移动终端设备。目前，手机的功能极其多样，其中之一便是高品质的音乐功能，因此，用于播放声音的扬声器箱被大量应用到现在的智能移动设备之中。
现有扬声器通常采用振膜振动发声，而高频截止频率是评价振膜的一项重要参数，但在现有技术中，振膜大多包括振膜本体和贴设于振膜中央位置的球顶，球顶通常采用铝箔+聚甲基丙烯酰亚胺泡沫塑料(PMI)+铝箔的三明治结构，但三明治结构的铝箔球顶的高频截止频率通常在8.5KHz以内，无法满足人们对扬声器的高音部分声学性能的需求。
 技术问题
现有技术的球顶材料高频截止频率低，无法满足人们对扬声器的高音部分声学性能的需求。
 技术解决方案
为解决上述技术问题，本发明是这样实现的，一种球顶材料，包括：中间层、胶黏层、薄膜层和表面层，所述胶黏层、所述薄膜层和所述表面层依次层叠设置在所述中间层上,且所述中间层的两侧均叠置有所述胶黏层、所述薄膜层和所述表面层；所述中间层采用发泡材料，所述发泡材料的密度范围在0.05-0.50g/cm 3内；所述胶黏层的厚度在3-20μm以内；所述薄膜层由所述胶黏层粘结在所述中间层上，所述薄膜层的厚度在2-20μm以内；所述表面层由纤维预浸料单向排布形成，所述纤维预浸料包括纤维和树脂，所述树脂的重量含量在20%-50%内，所述纤维预浸料的面密度范围在10-100g/m 2。
进一步地，所述中间层包括PMI、MCPET、PI、PAI和PPS中任意一种材料或任意多种材料的组合。
进一步地，所述胶黏层的厚度范围在5-15μm内。
进一步地，所述胶黏层采用胶黏剂，所述胶黏剂包括环氧树脂、酚醛树脂、丙烯酸树脂和硅胶中任意一种或任意多种的组合。
进一步地，所述薄膜层的厚度范围在5-15μm内。
进一步地，所述薄膜层包括铝箔、镁锂合金箔、钛箔、PI、LCP、PET和PEN中的一种或任意多种的组合。
进一步地，所述树脂包括环氧树脂、酚醛树脂、聚酰胺树脂、PEEK、PI和PEI中任意一种或任意多种的组合。
进一步地，所述纤维包括碳纤维、玻璃纤维、芳纶纤维和玄武岩纤维中任意一种或任意多种的组合。
进一步地，提供一种振膜，所述振膜由如上任意一种所述的球顶材料切割形成。
进一步地，提供一种扬声器，包括如上所述的振膜。
 有益效果
本发明的球顶材料的中间层采用发泡材料，并在中间层的两侧朝外依次叠置设置胶黏层、薄膜层和表面层，并且表面层采用纤维预浸料，能够提升球顶材料的品质；采用本发明的球顶材料的振膜和扬声器能够提升高频截止频率至10KHz，从而满足人们对扬声器的高音部分声学性能的需求。
 附图说明
图1是本发明实施例中球顶材料的结构示意图。
在附图中，各附图标记表示：1、中间层；2、胶黏层；3、薄膜层；4、表面层。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例：
在本实施例中，扬声器包括振膜，振膜由球顶材料切割形成，其中，如图1所示，球顶材料包括：中间层1、胶黏层2、薄膜层3和表面层4，胶黏层2、薄膜层3和表面层4依次层叠设置在中间层1上,且中间层1的两侧均叠置有胶黏层2、薄膜层3和表面层4；中间层1采用发泡材料，发泡材料的密度范围在0.05-0.50g/cm 3内；胶黏层2的厚度在3-20μm以内；薄膜层3由胶黏层2粘结在中间层1上，薄膜层3的厚度在2-20μm以内；表面层4由纤维预浸料单向排布形成，纤维预浸料包括纤维和树脂，树脂的重量含量在20%-50%内，纤维预浸料的面密度范围在10-100g/m 2。
球顶材料的中间层1采用发泡材料，并在中间层1的两侧朝外依次叠置设置胶黏层2、薄膜层3和表面层4，并且表面层4采用纤维预浸料，能够提升球顶材料的品质；采用本发明的球顶材料的振膜和扬声器能够提升高频截止频率至10KHz，从而满足人们对扬声器的高音部分声学性能的需求。
具体的，在本实施例中，发泡材料优选硬质发泡材料，发泡材料的密度可以例如为0.05g/cm 3、0.10g/cm 3、0.15g/cm 3、0.20g/cm 3、0.25g/cm 3、0.30g/cm 3、0.35g/cm 3、0.40g/cm 3、0.45g/cm 3、0.50g/cm 3等，中间层1可以包括PMI(聚甲基丙烯酰亚胺泡沫塑料)、MCPET(微发泡反射板：MicroCellularPET)、PI(聚酰亚胺：Polyimide)、PAI(酰胺基塑料：Polyamideimide)和PPS(聚苯硫醚塑料：Phenylenesulfide)等中任意一种材料或任意多种材料的组合，在其他实施例中，中间层1也可以包括聚苯乙烯、硬质聚氨酯、酚醛树脂、氨基树脂、环氧树脂和硬质聚氯乙烯等中的一种或多种。
胶黏层2的厚度范围可以在5-15μm内，例如为：5μm、6μm、7μm、8μm、9μm、10μm、11μm、12μm、13μm、14μm或15μm等，胶黏层2的厚度范围也可以在3-5μm内，例如为：3μm、4μm或5μm等，胶黏层2的厚度范围也可以在15-20μm内，例如为：16μm、17μm、18μm、19μm或20μm等。胶黏层2采用胶黏剂，在本实施例中，胶黏剂可以包括环氧树脂、酚醛树脂、丙烯酸树脂和硅胶等中任意一种或任意多种的组合；当然，胶黏剂是用于将中间层1和薄膜层3粘结固定，因此，能实现粘结固定中间层1和薄膜层3的材料均可，例如，在其他实施例中，胶黏剂也可以包括如纤维素酯、烯类聚合物、聚醚、聚酰胺、酚醛-丁腈胶、酚醛-氯丁胶、酚醛-聚氨酯胶、环氧-丁腈胶、环氧-聚硫胶等中任意一种或任意多种的组合。
薄膜层3的厚度范围可以在5-15μm内，例如为：5μm、6μm、7μm、8μm、9μm、10μm、11μm、12μm、13μm、14μm或15μm等，薄膜层3的厚度范围也可以在2-5μm内，例如为：2μm、3μm、4μm或5μm等，薄膜层3的厚度范围也可以在15-20μm内，例如为：16μm、17μm、18μm、19μm或20μm等。在本实施例中，薄膜层3由高模量材料制成，薄膜层3包括铝箔、镁锂合金箔、钛箔、PI(聚酰亚胺：Polyimide)、LCP(液晶高分子聚合物：LiquidCrystalPolymer)、PET(聚对苯二甲酸类塑料：Polyethyleneterephthalate)和PEN(PolyethyleneNaphthalate：聚萘二甲酸乙二醇酯)中的一种或任意多种的组合；在其他实施例中，薄膜层3也可以包括锂铝合金箔、镁铝合金箔或PPE(聚苯醚)中的一种或任意多种。
在表面层4的纤维预浸料中，树脂的重量含量可以例如为20%、21%、22%、23%、24%、25%、26%、27%、28%、29%、30%、31%、32%、33%、34%、35%、36%、37%、38%、39%、40%、41%、42%、43%、44%、45%、46%、47%、48%、49%、50%等，纤维预浸料的面密度可以例如为：10g/m 2、15g/m 2、20g/m 2、25g/m 2、30g/m 2、35g/m 2、40g/m 2、45g/m 2、50g/m 2、55g/m 2、60g/m 2、65g/m 2、70g/m 2、75g/m 2、80g/m 2、85g/m 2、90g/m 2、95g/m 2、100g/m 2等。在本实施例中，树脂可以包括环氧树脂、酚醛树脂、聚酰胺树脂、PEEK(聚醚醚酮：polyetheretherketone)、PI(聚酰亚胺：Polyimide)和PEI(聚醚酰亚胺：Polyetherimide)等中任意一种或任意多种的组合；在其他实施例中，树脂也可以包括聚丙烯(PP)、聚碳酸酯(PC)和聚醚砜(PES)等中的一种或任意多种的组合。在本实施例中，纤维采用高模量纤维，纤维可以包括碳纤维、玻璃纤维、芳纶纤维和玄武岩纤维等中任意一种或任意多种的组合，具体的，例如可以是：聚丙烯腈基碳纤维、沥青基碳纤维、PBO纤维(聚对苯撑苯并双口恶唑纤维：Poly-p-phenylenebenzobisthiazole)、聚对苯二甲酰对苯二胺、PE纤维、AR玻璃纤维、高强玻璃纤维和E-玻璃纤维等中的任意一种或任意多种的组合。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种球顶材料，其特征在于，包括：中间层、胶黏层、薄膜层和表面层，所述胶黏层、所述薄膜层和所述表面层依次层叠设置在所述中间层上,且所述中间层的两侧均叠置有所述胶黏层、所述薄膜层和所述表面层；所述中间层采用发泡材料，所述发泡材料的密度范围在0.05-0.50g/cm 3内；所述胶黏层的厚度在3-20μm以内；所述薄膜层由所述胶黏层粘结在所述中间层上，所述薄膜层的厚度在2-20μm以内；所述表面层由纤维预浸料单向排布形成，所述纤维预浸料包括纤维和树脂，所述树脂的重量含量在20%-50%内，所述纤维预浸料的面密度范围在10-100g/m 2。
  2. 根据权利要求1所述的球顶材料，其特征在于，所述中间层包括PMI、MCPET、PI、PAI和PPS中任意一种材料或任意多种材料的组合。
  3. 根据权利要求1所述的球顶材料，其特征在于，所述胶黏层的厚度范围在5-15μm内。
  4. 根据权利要求3所述的球顶材料，其特征在于，所述胶黏层采用胶黏剂，所述胶黏剂包括环氧树脂、酚醛树脂、丙烯酸树脂和硅胶中任意一种或任意多种的组合。
  5. 根据权利要求4所述的球顶材料，其特征在于，所述薄膜层的厚度范围在5-15μm内。
  6. 根据权利要求5所述的球顶材料，其特征在于，所述薄膜层包括铝箔、镁锂合金箔、钛箔、PI、LCP、PET和PEN中的一种或任意多种的组合。
  7. 根据权利要求1-6中任意一项所述的球顶材料，其特征在于，所述树脂包括环氧树脂、酚醛树脂、聚酰胺树脂、PEEK、PI和PEI中任意一种或任意多种的组合。
  8. 根据权利要求5所述的球顶材料，其特征在于，所述纤维包括碳纤维、玻璃纤维、芳纶纤维和玄武岩纤维中任意一种或任意多种的组合。
  9. 一种振膜，其特征在于，所述振膜由权利要求1-8中任意一项所述的球顶材料切割形成。
  10. 一种扬声器，其特征在于，包括权利要求9所述的振膜。
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