EP1276348A1 - Procédé pour former des couches de fibres de carbone pour une membrane acoustique - Google Patents

Procédé pour former des couches de fibres de carbone pour une membrane acoustique Download PDF

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Publication number
EP1276348A1
EP1276348A1 EP01117154A EP01117154A EP1276348A1 EP 1276348 A1 EP1276348 A1 EP 1276348A1 EP 01117154 A EP01117154 A EP 01117154A EP 01117154 A EP01117154 A EP 01117154A EP 1276348 A1 EP1276348 A1 EP 1276348A1
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EP
European Patent Office
Prior art keywords
carbon fiber
layer
fiber layer
vibration absorber
absorber layer
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01117154A
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German (de)
English (en)
Inventor
Lin Tung-Siang
Lin Chao-Hsien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP01117154A priority Critical patent/EP1276348A1/fr
Publication of EP1276348A1 publication Critical patent/EP1276348A1/fr
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a method for forming a composite carbon fiber layer and more particularly to a method for forming a composite carbon fiber layer adapted to be used in an acoustic diaphragm.
  • the present invention also relates to a structure of a carbon fiber molded acoustic diaphragm having high strength.
  • Carbon fiber is widely used in fabricating sporting goods and military supplies because of its high strength, low weight and excellence in flexibility. For example, carbon fibers are added into aluminum alloy to produce a golf shaft or into plastic materials to form a carbon fiber reinforced plastic (CFRP) for producing tires.
  • CFRP carbon fiber reinforced plastic
  • carbon fibers are also employed as acoustic diaphragms of planar diaphragm speakers.
  • the acoustic diaphragm of a typical planar diaphragm speaker is relatively stiff and substantially flat and supported by a frame.
  • the acoustic diaphragm is vibrated by an electromagnetic driver coupled to the rear surface thereof so as to emit sound.
  • the acoustic diaphragm is constructed by combining at least two carbon fiber layers.
  • Figs. 1 and 2 show two types of acoustic diaphragm according to prior art.
  • the acoustic diaphragm 10 is formed by coupling two carbon fiber layers 11 and 12.
  • the fibers 110 of the upper carbon fiber layer 11 and the fibers 120 of the lower carbon fiber layer 12 are perpendicular to each other. Since the applied stresses on the both layers 11 and 12 are usually not uniform, the ends will be raised and therefore could not be used in a planar diaphragm speaker.
  • an acoustic diaphragm 20 is formed by coupling three carbon fiber layers 21, 22 and 23 from top to bottom.
  • the fibers 210 of the top layer 21 and the fibers 230 of the bottom layer 23 are parallel with each other but perpendicular to the fibers 220 of the medium layer 22. It is known in the art that the thickness of each layer is about 0.1 mm.
  • the three carbon fiber layers 21, 22 and 23 are then subjected to a heating and pressing process to form the composite layer 20 to be used as an acoustic diaphragm. It is found that the structure of the carbon fiber composite layer 20 could only slightly increase the strength thereof; however, the three layers' structure brings about increase in weight.
  • the present invention provides an improved structure of an acoustic diaphragm for overcoming the problems described above.
  • a method for forming a composite carbon fiber layer includes steps of providing two carbon fibers layers having fibers in parallel with each other and disposed in a stacked form, and heating and pressing the two carbon layers simultaneously to form the carbon fiber composite layer.
  • the heating and pressing step is carried out at about 130 °C under 300 psia for 60 minutes.
  • the carbon fiber composite layer further includes a first vibration absorber layer between the top carbon fiber layer and the bottom carbon fiber layer.
  • the carbon fiber composite layer further includes a second vibration absorber layer disposed on the top carbon fiber layer and a third vibration absorber layer disposed under the bottom carbon fiber layer.
  • each of the first vibration absorber layer, the second vibration absorber layer and the third vibration absorber layer is made of high-density polyethylene (HDPE).
  • HDPE high-density polyethylene
  • the thickness of the top carbon fiber layer is about 0.1 mm and the thickness of the bottom carbon fiber layer is about 0.1 mm.
  • an acoustic diaphragm which includes a bottom carbon fiber layer and a top carbon fiber layer disposed on the bottom carbon fiber layer, wherein the fibers of the top carbon fiber layer and the fibers of the bottom carbon fiber layer are parallel with each other.
  • the acoustic diaphragm further includes a first vibration absorber layer between the top carbon fiber layer and the bottom carbon fiber layer.
  • the acoustic diaphragm further includes a second vibration absorber layer disposed on the top carbon fiber layer and a third vibration absorber layer disposed under the bottom carbon fiber layer.
  • each of the first vibration absorber layer, the second vibration absorber layer and the third vibration absorber layer is made of high-density polyethylene (HDPE).
  • HDPE high-density polyethylene
  • the thickness of the top carbon fiber layer is about 0.1 mm and the thickness of the bottom carbon fiber layer is about 0.1 mm.
  • a structure of an acoustic diaphragm adapted to be used in a planar diaphragm speaker.
  • the structure includes a bottom carbon fiber layer having a first fiber direction, a first vibration absorber layer disposed on the bottom carbon fiber layer, and a top carbon fiber layer disposed on the bottom carbon fiber layer and has a second fiber direction, wherein the first fiber direction and the second fiber direction are parallel with each other.
  • Fig. 3 is a perspective view showing the acoustic diaphragm including two carbon fiber layers according to the first embodiment of the present invention.
  • the top carbon fiber layer 31 is disposed on the bottom carbon fiber layer 32.
  • Fig. 4 is a perspective view showing the acoustic diaphragm according to the second embodiment of the present invention.
  • the acoustic diaphragm 40 could further include a first vibration absorber layer 41 between the two layers 31 and 32, as can be seen in Fig. 4.
  • Fig. 5 is a perspective view showing the acoustic diaphragm according to the third embodiment of the present invention.
  • the acoustic diaphragm 50 further includes a second vibration absorber layer 42 disposed on the top carbon fiber layer 31 and a third vibration absorber layer 43 disposed under the bottom carbon fiber layer.
  • the vibration absorber layers 41, 42 and 43 are preferably made of high-density polyethylene (HDPE) for damping the acoustic diaphragms 30, 40 and 50.
  • HDPE high-density polyethylene
  • connection of the two carbon fiber layers 31 and 32 in Fig. 3 are performed by heating and pressing simultaneously.
  • the three layers 31, 32 and 41 in Fig. 4 and the five layers 31, 32, 41, 42 and 43 in Fig. 5 are subjected to heating and pressing simultaneously to form the acoustic diaphragms 30, 40 and 50 respectively.
  • the heating and pressing process is carried out at about 130°C under 300 psia for 60 minutes.
  • the acoustic diaphragm of the present invention utilizes two carbon fiber layers whose fibers are parallel with each other. Such structure is lighter than the three layers' structure in the prior art and can prevent the ends of the two layers' structure from raising and bending. Furthermore, the acoustic diaphragm of the present invention has the advantage of higher strength. In addition, only two steps are required to form the composite carbon fiber layer, which is more convenient and less time-consuming.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP01117154A 2001-07-14 2001-07-14 Procédé pour former des couches de fibres de carbone pour une membrane acoustique Withdrawn EP1276348A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01117154A EP1276348A1 (fr) 2001-07-14 2001-07-14 Procédé pour former des couches de fibres de carbone pour une membrane acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01117154A EP1276348A1 (fr) 2001-07-14 2001-07-14 Procédé pour former des couches de fibres de carbone pour une membrane acoustique

Publications (1)

Publication Number Publication Date
EP1276348A1 true EP1276348A1 (fr) 2003-01-15

Family

ID=8178045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01117154A Withdrawn EP1276348A1 (fr) 2001-07-14 2001-07-14 Procédé pour former des couches de fibres de carbone pour une membrane acoustique

Country Status (1)

Country Link
EP (1) EP1276348A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016082442A (ja) * 2014-10-17 2016-05-16 ヤマハ株式会社 スピーカー用振動板及びその製造方法
US9388519B1 (en) 2015-01-30 2016-07-12 Velcro BVBA Needling fibrous webs
GB2549955A (en) * 2016-05-03 2017-11-08 4A Mfg Gmbh Membrane plate structure for generating sound waves
US9872543B2 (en) 2015-05-29 2018-01-23 Velcro BVBA Loop fastening material
US10010142B2 (en) 2015-05-29 2018-07-03 Velcro BVBA Loop fastening material
US12421638B2 (en) 2019-02-28 2025-09-23 Velcro Ip Holdings Llc Making soft fabric touch fasteners

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5664596A (en) * 1979-10-30 1981-06-01 Sanyo Electric Co Ltd Speaker diaphragm and its manufacture
US4562899A (en) * 1982-06-16 1986-01-07 Nippon Gakki Seizo Kabushiki Kaisha Diaphragm of electroacoustic transducer and method of manufacturing the same
US5701359A (en) * 1995-04-06 1997-12-23 Precision Power Flat-panel speaker
DE20104724U1 (de) * 2001-03-19 2001-07-05 Lin, Chao-Hsien, Taipeh/T'ai-pei Aus Kohlenstofffasern hergestellte akustische Membran für planare Membranlautsprecher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5664596A (en) * 1979-10-30 1981-06-01 Sanyo Electric Co Ltd Speaker diaphragm and its manufacture
US4562899A (en) * 1982-06-16 1986-01-07 Nippon Gakki Seizo Kabushiki Kaisha Diaphragm of electroacoustic transducer and method of manufacturing the same
US5701359A (en) * 1995-04-06 1997-12-23 Precision Power Flat-panel speaker
DE20104724U1 (de) * 2001-03-19 2001-07-05 Lin, Chao-Hsien, Taipeh/T'ai-pei Aus Kohlenstofffasern hergestellte akustische Membran für planare Membranlautsprecher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 129 (E - 070) 19 August 1981 (1981-08-19) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016082442A (ja) * 2014-10-17 2016-05-16 ヤマハ株式会社 スピーカー用振動板及びその製造方法
US9388519B1 (en) 2015-01-30 2016-07-12 Velcro BVBA Needling fibrous webs
US9790626B2 (en) 2015-01-30 2017-10-17 Velcro BVBA Needling fibrous webs
US9872543B2 (en) 2015-05-29 2018-01-23 Velcro BVBA Loop fastening material
US10010142B2 (en) 2015-05-29 2018-07-03 Velcro BVBA Loop fastening material
GB2549955A (en) * 2016-05-03 2017-11-08 4A Mfg Gmbh Membrane plate structure for generating sound waves
US11039252B2 (en) 2016-05-03 2021-06-15 4A Manufacturing Gmbh Membrane plate structure for generating sound waves
US12421638B2 (en) 2019-02-28 2025-09-23 Velcro Ip Holdings Llc Making soft fabric touch fasteners

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