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WO2016141745A1 - 一种振膜以及一种扬声器装置 - Google Patents

一种振膜以及一种扬声器装置 Download PDF

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Publication number
WO2016141745A1
WO2016141745A1 PCT/CN2015/097753 CN2015097753W WO2016141745A1 WO 2016141745 A1 WO2016141745 A1 WO 2016141745A1 CN 2015097753 W CN2015097753 W CN 2015097753W WO 2016141745 A1 WO2016141745 A1 WO 2016141745A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
carbon fiber
fiber cloth
body portion
diaphragm body
Prior art date
Application number
PCT/CN2015/097753
Other languages
English (en)
French (fr)
Inventor
常秀丽
杨健斌
Original Assignee
歌尔声学股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 歌尔声学股份有限公司 filed Critical 歌尔声学股份有限公司
Priority to EP15884423.3A priority Critical patent/EP3247131B1/en
Priority to US15/556,091 priority patent/US20180270578A1/en
Publication of WO2016141745A1 publication Critical patent/WO2016141745A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12Non-planar diaphragms or cones
    • H04R7/122Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/06Plane diaphragms comprising a plurality of sections or layers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12Non-planar diaphragms or cones
    • H04R7/127Non-planar diaphragms or cones dome-shaped
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00Details 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
    • H04R2307/023Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00Details 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
    • H04R2307/025Diaphragms comprising polymeric materials
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00Details 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
    • H04R2307/029Diaphragms comprising fibres

Definitions

  • the invention relates to a diaphragm and a speaker device.
  • the prior art speaker diaphragm generally includes a reinforcing portion at a central position and a folded portion at an edge position, wherein the folded portion is generally a relatively flexible material, the reinforcing portion is a relatively rigid material, and the rigidity is reinforced.
  • the part can prevent the diaphragm from generating split vibration in the high frequency range, which can improve the high frequency sound effect of the speaker product.
  • the reinforcement material is required to be lighter in weight and more rigid, so it is necessary to provide a reinforcement that has a lighter weight and greater rigidity.
  • a diaphragm comprising a diaphragm body portion and a reinforcing portion coupled to a central portion of the diaphragm body portion, the reinforcing portion comprising a carbon fiber cloth layer.
  • the carbon fiber cloth layer is a woven carbon fiber cloth or a unidirectional carbon fiber cloth; and the woven carbon fiber cloth is a plain carbon fiber cloth or a twill carbon fiber cloth.
  • the carbon fiber cloth layer is a woven carbon fiber cloth and the diaphragm body portion is an isotropic diaphragm material; or the carbon fiber cloth layer is a unidirectional carbon fiber cloth and the diaphragm body portion is oriented Opposite diaphragm material.
  • the carbon fiber cloth layer is a woven carbon fiber cloth and the diaphragm body portion is a TPU material; or the carbon fiber cloth layer is a unidirectional carbon fiber cloth and the diaphragm body portion is a PEEK material; or The carbon fiber cloth layer is a unidirectional carbon fiber cloth and the diaphragm body portion is a TPEE material.
  • the carbon fiber cloth layer comprises a plurality of carbon fiber cloths which are combined together.
  • the carbon fiber cloth layer is a carbon fiber prepreg.
  • the shape of the reinforcing portion is any one of the following: a flat plate type, a dome type, and a straw hat type.
  • the diaphragm body portion is a polymer material or a silicone rubber material.
  • the reinforcing portion is bonded to the diaphragm body portion; or the reinforcing portion is integrally injection molded with the diaphragm body portion; or the reinforcing portion and the diaphragm body portion One-piece hot press forming.
  • the diaphragm body portion is a polymer material and the reinforcing portion is bonded to the diaphragm body portion; or the diaphragm body portion is a polymer material and the reinforcing portion is The diaphragm body portion is integrally thermoformed; or the diaphragm body portion is a silicone rubber material and the reinforcing portion is integrally injection molded with the diaphragm body portion.
  • the diaphragm body portion includes a central portion at an intermediate position and a folded portion at an edge position, and a portion of the central portion facing the reinforcing portion conforms to a shape of the reinforcing portion,
  • the reinforcing portion is integrally formed with the diaphragm body portion.
  • the diaphragm body portion includes a central portion at an intermediate position and a folded portion at an edge position, the central portion is provided with a recess, the reinforcing portion is embedded in the recess, and the reinforcing portion is The diaphragm body portion is integrally formed.
  • a speaker device comprising a diaphragm as described above.
  • the diaphragm of the invention adopts carbon fiber cloth as the reinforcing portion, and the carbon fiber cloth has the characteristics of low density, high strength and high modulus, can fully satisfy the requirements of the diaphragm for the performance of the reinforcing portion and satisfies the acoustic performance of the speaker device to the diaphragm.
  • the requirements for the diaphragm and speaker device have the following technical effects:
  • the low-density reinforcement produces low Mms (vibration quality), which enables the diaphragm to achieve high sensitivity and high-frequency response.
  • the high-strength, high-modulus reinforcement can increase the transmission speed of high-frequency sound waves, ensuring that the vibration frequency of the diaphragm portion at the edge of the reinforcing portion and the reinforcing portion is higher, thereby obtaining a higher resonance frequency. Broaden the frequency band of high frequencies.
  • the carbon fiber cloth can withstand high temperature.
  • it is only necessary to overlap the cut reinforcing portion and the diaphragm film (the diaphragm body portion), and then integrally press-forming the two to connect the two together.
  • the manufacturing process is simple and easy to implement.
  • Figure 1 is a schematic view showing the structure of a first embodiment of a diaphragm of the present invention.
  • Figure 2 is a schematic view showing the structure of a second embodiment of the diaphragm of the present invention.
  • Figure 3 is a schematic view showing the structure of a third embodiment of the diaphragm of the present invention.
  • Figure 4 is a schematic view showing the structure of a fourth embodiment of the diaphragm of the present invention.
  • Figure 5 is a schematic view showing the structure of a fifth embodiment of the diaphragm of the present invention.
  • Figure 6 is a schematic view showing the structure of a first embodiment of the woven structure of the carbon fiber cloth of the present invention.
  • Figure 7 is a schematic view showing the structure of a second embodiment of the woven structure of the carbon fiber cloth of the present invention.
  • Figure 8 is a schematic view showing the structure of a third embodiment of the woven structure of the carbon fiber cloth of the present invention.
  • any specific value should be construed as merely illustrative. Illustrative, not as a limitation. Thus, other examples of the exemplary embodiments may have different values.
  • a diaphragm in accordance with a first aspect of the present invention, includes a diaphragm body portion 200 and a reinforcement portion 100 coupled to a central position of the diaphragm body portion 200, the reinforcement portion 100 including The carbon fiber cloth layer, the diaphragm body portion 200 is fixed to the support member 300 of the diaphragm.
  • the reinforcing portion 100 may have a shape such as a flat plate type, a dome type, or a straw hat type, and the flat plate type may have a shape such as a rectangle, a circle, or an ellipse.
  • the diaphragm body portion 200 includes a central portion 201 at an intermediate position and a folded portion 202 at an edge position, and the central portion 201 and the reinforcing portion 100 are each in the shape of a flat plate. It can be bonded.
  • the diaphragm body portion 200 is a hollow structure and the edge position is provided with a folding ring structure 202, and the reinforcing portion 100 is located at a center position of the diaphragm body portion 200; in the second embodiment, The edge portion of the reinforcing portion 100 and the diaphragm body portion 200 partially overlap, and the two may be bonded.
  • the diaphragm body portion 200 includes a central portion 201 at an intermediate position and a folded portion 202 at an edge position.
  • the central portion 201 is provided with a recess, and the reinforcing portion 100 is embedded in the recess to compensate
  • the strong portion 100 and the diaphragm body portion 200 may be integrally injection molded.
  • the support member 300 may also be integrally molded with them; of course, the reinforcing portion 100 and the diaphragm body portion 200 may also be integrally formed by hot pressing or bonding. Connected together.
  • the diaphragm body portion 200 includes a central portion 201 at an intermediate position and a folded portion 202 at an edge position, and a portion of the central portion 201 facing the reinforcing portion 100 and a reinforcing portion
  • the shape of the 100 is the same, which means that the reinforcing portion 100 can be closely attached to the center portion 201.
  • the reinforcing portion 100 is a dome type or a straw hat type; the reinforcing portion 100 and the diaphragm body portion 200 It can be integrally formed by hot press molding or integral injection molding, or it can be bonded.
  • the diaphragm body portion 200 is a hollow structure and has an edge.
  • the position is provided with a folding ring structure 202, and the reinforcing portion 100 is located at a central position of the diaphragm body portion 200, which is different from the second embodiment in that the reinforcing portion 100 is a straw hat type; in the fifth embodiment, the reinforcing portion is reinforced.
  • the edge portion of the portion 100 and the diaphragm body portion 200 partially overlap, and the two may be bonded.
  • connection between the reinforcing portion and the diaphragm main body portion may be any one of the following: bonding, integral injection molding, and integral hot press molding.
  • integral hot press forming the cut carbon fiber cloth (reinforcing portion) and the diaphragm film (the diaphragm body portion) may be stacked together and then integrally formed by hot pressing.
  • One-piece molding reduces the bonding process and provides stability and consistency.
  • the diaphragm body portion may be a polymer material or a silicone rubber material.
  • the diaphragm body portion is a polymer material and the reinforcing portion is bonded to the diaphragm body portion; or the diaphragm body portion is a polymer material and the reinforcing portion and the diaphragm body portion are integrally thermoformed; or
  • the film body portion is a silicone rubber material, and the reinforcing portion and the diaphragm body portion are integrally injection-molded.
  • the carbon fiber cloth may be formed by arranging or weaving carbon fiber threads, and the carbon fiber wires may have a rectangular or circular or elliptical cross section. Further, the carbon fiber prepreg can be formed by dipping or the like, and the prepreg can seal the gap between the carbon fiber lines and the meshed mesh, and facilitate the later molding.
  • the carbon fiber cloth layer is a single-layer carbon fiber cloth or a multi-layer carbon fiber cloth which is compounded together, and the multi-layer carbon fiber cloth is combined to increase the hardness and strength of the reinforcing portion, and at the same time, the gap between the carbon fiber lines and the weaving can be further sealed. Mesh.
  • the woven structure of the carbon fiber cloth may be a plain weave structure.
  • the plain weave structure is that the warp threads are floated and slid in the weft direction, and the floating line sinking of the adjacent warp threads is reversed, and the weft lines are, for example, a1-a4, warp threads. For example, b1-b8. Due to the warp and weft interlacing of the carbon fiber thread, the plain carbon fiber cloth has the same elastic characteristics in two directions, and the texture of the plain weave fabric is firm and the appearance is flat, and the size of the mesh can be adjusted according to actual needs.
  • the woven structure of the carbon fiber cloth may also be a twill weave structure, and the tissue points of the twill weave structure are continuous and obliquely grained.
  • a twill weave structure is shown. Each weft line alternately floats on two warp threads while alternately sinking under two warp threads, such as a1-a4, and warp threads such as b1-b8.
  • the twill carbon fiber cloth has the same elastic strength in both directions.
  • the diaphragm body portion is preferably an isotropic diaphragm material to ensure that the vibration system of the product is isotropic and does not cause polarization problems.
  • the isotropic diaphragm material is, for example, TPU (Thermoplastic polyurethanes).
  • the carbon fiber cloth may also be a woven structure of a combination of plain and twill.
  • the carbon fiber cloth layer is a unidirectional carbon fiber cloth in which each carbon fiber line is arranged in the same direction without crossing, for example, carbon fiber lines c1-c8. Since the carbon fiber thread itself has directionality, the unidirectional carbon fiber cloth has a directional direction in a two-dimensional space and different elastic properties in two directions.
  • the diaphragm body portion is preferably made of an anisotropic diaphragm material to ensure balanced vibration of the vibration system of the product without causing polarization problems.
  • the anisotropic diaphragm material is, for example, PEEK (Polyetheretherketone) or TPEE (Thermoplastic polyurethanes).
  • a reinforcing portion (reinforcing portion) can be obtained, and the reinforcing portion 100 can be in the shape of a flat plate, a dome type, a straw hat, or the like.
  • the flat type may be a rectangle, a circle, an ellipse or the like.
  • a loudspeaker apparatus comprising a diaphragm as previously described.
  • the diaphragm of the present invention uses a carbon fiber cloth as a reinforcing portion (DOME). Since the carbon fiber cloth has low density, high strength, and high modulus characteristics, it can fully satisfy the requirements of the diaphragm for the performance of the reinforcing portion and satisfy the vibration of the speaker device.
  • the acoustic performance requirements of the membrane give the diaphragm and speaker device the following technical effects:
  • the low-density reinforcement produces low Mms (vibration quality), which enables the diaphragm to achieve high sensitivity and high-frequency response.
  • High-strength, high-modulus reinforcement to increase the transmission speed of high-frequency sound waves and ensure
  • the diaphragm vibration portion at the edge of the reinforcing portion and the reinforcing portion has a higher splitting vibration frequency, thereby obtaining a higher resonance frequency and widening the frequency band of the high frequency.
  • the carbon fiber cloth can withstand high temperature.
  • it is only necessary to overlap the cut reinforcing portion and the diaphragm film (the diaphragm body portion), and then integrally press-forming the two to connect the two together.
  • the manufacturing process is simple and easy to implement.

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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

本发明公开了一种振膜和一种扬声器装置,振膜包括振膜本体部和结合于振膜本体部中心位置处的补强部,所述补强部包括碳纤维布层。本发明的振膜采用具有较轻的重量和较大的刚性的碳纤维布作为补强部,能够充分满足扬声器装置对振膜声学性能的要求。 (图1)

Description

一种振膜以及一种扬声器装置 技术领域
本发明涉及一种振膜以及一种扬声器装置。
背景技术
现有技术中的扬声器振膜通常包括位于中心位置的补强部和位于边缘位置的折环部,其中折环部通常为相对柔性的材料,补强部为相对刚性的材料,刚性的补强部可以防止振膜在高频段产生分割振动,可以提高扬声器产品的高频声效。理想状态下要求补强部材料的重量较轻而且刚性较大,因此有必要提供一种补强部,使其具有较轻的重量和较大的刚性。
发明内容
本发明的目的在于提供一种具有较轻重量和较大刚性的补强部的振膜以及具有这种振膜的扬声器装置。
根据本发明的第一方面,提供了一种振膜,包括振膜本体部和结合于振膜本体部中心位置的补强部,所述补强部包括碳纤维布层。
优选的,所述碳纤维布层为编织碳纤维布或者单向碳纤维布;所述编织碳纤维布为平纹碳纤维布或者斜纹碳纤维布。
优选的,所述碳纤维布层为编织碳纤维布并且所述振膜本体部为各向同性的振膜材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为各向异性的振膜材料。
优选的,所述碳纤维布层为编织碳纤维布并且所述振膜本体部为TPU材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为PEEK材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为TPEE材料。
优选的,所述碳纤维布层包括复合在一起的多层碳纤维布。
优选的,所述碳纤维布层为碳纤维预浸布。
优选的,所述补强部的形状为以下任一:平板型、球顶型、草帽型。
优选的,所述振膜本体部为高分子材料或硅橡胶材料。
优选的,所述补强部与所述振膜本体部粘接;或者,所述补强部与所述振膜本体部一体注塑成型;或者,所述补强部与所述振膜本体部一体热压成型。
优选的,所述振膜本体部为高分子材料并且所述补强部与所述振膜本体部粘接;或者,所述振膜本体部为高分子材料并且所述补强部与所述振膜本体部一体热压成型;或者,所述振膜本体部为硅橡胶材料并且所述补强部与所述振膜本体部一体注塑成型。
优选的,所述振膜本体部包括位于中间位置的中心部以及位于边缘位置的折环部,所述中心部的正对所述补强部的部分与所述补强部的形状一致,所述补强部与所述振膜本体部一体成型。
优选的,所述振膜本体部包括位于中间位置的中心部以及位于边缘位置的折环部,所述中心部设有凹陷,所述补强部嵌入所述凹陷内,所述补强部与所述振膜本体部一体成型。
根据本发明的第二方面,提供了一种扬声器装置,所述扬声器装置包括如前所述的振膜。
本发明的振膜采用碳纤维布作为补强部,由于碳纤维布具有低密度、高强度、高模量的特性,能够充分满足振膜对补强部性能的要求以及满足扬声器装置对振膜声学性能的要求,使振膜和扬声器装置具有以下技术效果:
1.低密度的补强部产生低的Mms(振动质量),能够使振膜获得高的灵敏度和高频响应。
2.高强度、高模量的补强部,能够提高高频声波的传输速度,确保补强部和补强部边缘处的振膜部分的分割振动频率较高,从而获得较高的谐振频率,拓宽高频的频带。
3.碳纤维布可耐高温,制造振膜时只需要将裁切好的补强部和振膜薄膜(振膜本体部)重叠在一起,然后一体热压成型,就可以将两者连接在一起,制造工艺简单易实施。
通过以下参照附图对本发明的示例性实施例的详细描述,本发明的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实施例,并且连同其说明一起用于解释本发明的原理。
图1是本发明振膜第一实施例的结构示意图。
图2是本发明振膜第二实施例的结构示意图。
图3是本发明振膜第三实施例的结构示意图。
图4是本发明振膜第四实施例的结构示意图。
图5是本发明振膜第五实施例的结构示意图。
图6是本发明碳纤维布的编织结构的第一实施例的结构示意图。
图7是本发明碳纤维布的编织结构的第二实施例的结构示意图。
图8是本发明碳纤维布的编织结构的第三实施例的结构示意图。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到:除非另外具体说明,否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的,决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论,但在适当情况下,所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中,任何具体值应被解释为仅仅是示 例性的,而不是作为限制。因此,示例性实施例的其它例子可以具有不同的值。
应注意到:相似的标号和字母在下面的附图中表示类似项,因此,一旦某一项在一个附图中被定义,则在随后的附图中不需要对其进行进一步讨论。
参考图1-5所示,根据本发明的第一方面,提出了一种振膜:包括振膜本体部200和结合于振膜本体部200中心位置的补强部100,补强部100包括碳纤维布层,振膜本体部200固定在振膜的支撑件300上。其中,补强部100可以为平板型、球顶型、草帽型等形状,平板型可以是矩形、圆形、椭圆形等形状。
参考图1所示的第一实施例,振膜本体部200包括位于中间位置的中心部201以及位于边缘位置的折环部202,中心部201和补强部100均为平板形状,两者之间可以为粘接。
参考图2所示的第二实施例,振膜本体部200为中空结构并且边缘位置设置有折环结构202,补强部100位于振膜本体部200的中心位置;在第二实施例中,补强部100的边缘部分和振膜本体部200有部分重叠,两者之间可以为粘接。
参考图3所示的第三实施例,振膜本体部200包括位于中间位置的中心部201以及位于边缘位置的折环部202,中心部201设有凹陷,补强部100嵌入凹陷内,补强部100和振膜本体部200可以为一体注塑成型,进一步的,支撑件300也可以与它们一体注塑成型;当然,补强部100和振膜本体部200还可以为一体热压成型或者粘接在一起。
参考图4所示的第四实施例,振膜本体部200包括位于中间位置的中心部201以及位于边缘位置的折环部202,中心部201的正对补强部100的部分与补强部100的形状一致,这意味着补强部100可以紧密贴合于中心部201,本实施例中补强部100为球顶型,也可以为草帽型;补强部100和振膜本体部200可以一体热压成型或一体注塑成型,也可以为粘接。
参考图5所示的第五实施例,振膜本体部200为中空结构并且边缘 位置设置有折环结构202,补强部100位于振膜本体部200的中心位置,和第二实施例的不同之处在于,补强部100为草帽型;在第五实施例中,补强部100的边缘部分和振膜本体部200有部分重叠,两者之间可以为粘接。
补强部与振膜本体部的连接方式可以为以下任一:粘接、一体注塑成型、一体热压成型。一体热压成型时,可以先将裁切好的碳纤维布(补强部)和振膜薄膜(振膜本体部)叠放在一起,然后一体热压成型。一体成型减少了粘接工艺,并且稳定性与一致性好。
振膜本体部可以为高分子材料或硅橡胶材料。优选的,振膜本体部为高分子材料并且补强部与振膜本体部粘接;或者,振膜本体部为高分子材料并且补强部与振膜本体部一体热压成型;或者,振膜本体部为硅橡胶材料并且补强部与振膜本体部一体注塑成型,一体注塑成型时,将裁切好的补强部(补强部)放入注塑模具,使硅橡胶振膜主体和补强部注塑在一起。
下面介绍补强部使用的碳纤维布的结构:
碳纤维布可以由碳纤维线排列或编织形成,碳纤维线的截面可以为矩形或者圆形或者椭圆形。进一步的,之后还可以再经过浸胶等工艺形成碳纤维预浸布,预浸可以密封碳纤维线之间的缝隙和编织的网孔,同时便于后期的成型。碳纤维布层为单层碳纤维布或者为复合在一起的多层碳纤维布,多层碳纤维布复合在一起可以增加补强部的硬度和强度,同时还可以进一步密封碳纤维线之间的缝隙和编织的网孔。
碳纤维布的编织结构可以为平纹编织结构,参考图6所示,平纹编织结构是经线沿着纬向顺序一浮一沉于纬线,相邻经线的浮沉情况相反,纬线例如为a1-a4,经线例如为b1-b8。由于碳纤维线经纬交错编织,平纹碳纤维布在两个方向上的弹性特性相同,且平纹织物的质地坚牢、外观平挺,可以根据实际需要调整网孔的大小。
碳纤维布的编织结构还可以为斜纹编织结构,斜纹编织结构的组织点是连续的、成斜向纹路的。参考图7所示为斜纹编织结构的一个实施例, 每根纬线交替浮于两根经线之上同时交替沉于两根经线之下,纬线例如为a1-a4,经线例如为b1-b8。斜纹碳纤维布在两个方向上的弹性强度相同。
如果选用平纹或者斜纹的碳纤维布作为补强部,振膜本体部优选采用各向同性的振膜材料,确保产品的振动系统为各向同性,不会引起偏振问题。各向同性的振膜材料例如为TPU(Thermoplastic polyurethanes,热塑性聚氨酯弹性体橡胶)。
以上给出了编织结构的两个实施例,当然碳纤维布也可以是平纹和斜纹组合的编织结构。
参考图8所示,碳纤维布层为单向碳纤维布,是将每根碳纤维线在同一方向排列起来不进行交叉,例如碳纤维线c1-c8。由于碳纤维线本身具有方向性,所以单向碳纤维布在二维空间中是有方向的,在两个方向上的弹性特性不同。
如果选用单向碳纤维布作为补强部,振膜本体部优选采用各向异性的振膜材料,确保产品的振动系统均衡振动,不会引起偏振问题。各向异性的振膜材料例如为PEEK(Polyetheretherketone,聚醚醚酮)或者TPEE(Thermoplastic polyurethanes,热塑性聚氨酯弹性体橡胶)。
碳纤维布层经热压成型后或者经其它工艺成型后,再进行裁切,就可以获得补强部(补强部),补强部100可以为平板型、球顶型、草帽型等形状,平板型可以是矩形、圆形、椭圆形等形状。
根据本发明的第二方面,提出了一种扬声器装置,扬声器装置包括如前所述的振膜。
本发明的振膜采用碳纤维布作为补强部(DOME),由于碳纤维布具有低密度、高强度、高模量的特性,能够充分满足振膜对补强部性能的要求以及满足扬声器装置对振膜声学性能的要求,使振膜和扬声器装置具有以下技术效果:
1.低密度的补强部产生低的Mms(振动质量),能够使振膜获得高的灵敏度和高频响应。
2.高强度、高模量的补强部,能够提高高频声波的传输速度,确保 补强部和补强部边缘处的振膜部分的分割振动频率较高,从而获得较高的谐振频率,拓宽高频的频带。
3.碳纤维布可耐高温,制造振膜时只需要将裁切好的补强部和振膜薄膜(振膜本体部)重叠在一起,然后一体热压成型,就可以将两者连接在一起,制造工艺简单易实施。
虽然已经通过例子对本发明的一些特定实施例进行了详细说明,但是本领域的技术人员应该理解,以上例子仅是为了进行说明,而不是为了限制本发明的范围。本领域的技术人员应该理解,可在不脱离本发明的范围和精神的情况下,对以上实施例进行修改。

Claims (13)

  1. 一种振膜,其特征在于,包括振膜本体部和结合于振膜本体部中心位置的补强部,所述补强部包括碳纤维布层。
  2. 根据权利要求1所述的振膜,其特征在于,所述碳纤维布层为编织碳纤维布或者单向碳纤维布;所述编织碳纤维布为平纹碳纤维布或者斜纹碳纤维布。
  3. 根据权利要求1-2任一项所述的振膜,其特征在于,所述碳纤维布层为编织碳纤维布并且所述振膜本体部为各向同性的振膜材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为各向异性的振膜材料。
  4. 根据权利要求1-3任一项所述的振膜,其特征在于,所述碳纤维布层为编织碳纤维布并且所述振膜本体部为TPU材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为PEEK材料;或者,所述碳纤维布层为单向碳纤维布并且所述振膜本体部为TPEE材料。
  5. 根据权利要求1-4任一项所述的振膜,其特征在于,所述碳纤维布层包括复合在一起的多层碳纤维布。
  6. 根据权利要求1-5任一项所述的振膜,其特征在于,所述碳纤维布层为碳纤维预浸布。
  7. 根据权利要求1-6任一项所述的振膜,其特征在于,所述补强部的形状为以下任一:平板型、球顶型、草帽型。
  8. 根据权利要求1-7任一项所述的振膜,其特征在于:所述振膜本体部为高分子材料或硅橡胶材料。
  9. 根据权利要求1-8任一项所述的振膜,其特征在于,所述补强部与所述振膜本体部粘接;或者,所述补强部与所述振膜本体部一体注塑成型;或者,所述补强部与所述振膜本体部一体热压成型。
  10. 根据权利要求1-9任一项所述的振膜,其特征在于,所述振膜本体部为高分子材料并且所述补强部与所述振膜本体部粘接;或者,所述振 膜本体部为高分子材料并且所述补强部与所述振膜本体部一体热压成型;或者,所述振膜本体部为硅橡胶材料并且所述补强部与所述振膜本体部一体注塑成型。
  11. 根据权利要求1-10任一项所述的振膜,其特征在于,所述振膜本体部包括位于中间位置的中心部以及位于边缘位置的折环部,所述中心部的正对所述补强部的部分与所述补强部的形状一致,所述补强部与所述振膜本体部一体成型。
  12. 根据权利要求1-10任一项所述的振膜,其特征在于,所述振膜本体部包括位于中间位置的中心部以及位于边缘位置的折环部,所述中心部设有凹陷,所述补强部嵌入所述凹陷内,所述补强部与所述振膜本体部一体成型。
  13. 一种扬声器装置,其特征在于,包括根据权利要求1-12任一项所述的振膜。
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CN104703100A (zh) 2015-06-10

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