GB1445943A - Methods of making electrets - Google Patents

Methods of making electrets

Info

Publication number
GB1445943A
GB1445943A GB2933574A GB2933574A GB1445943A GB 1445943 A GB1445943 A GB 1445943A GB 2933574 A GB2933574 A GB 2933574A GB 2933574 A GB2933574 A GB 2933574A GB 1445943 A GB1445943 A GB 1445943A
Authority
GB
United Kingdom
Prior art keywords
film
electret
plate
july
heating
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.)
Expired
Application number
GB2933574A
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB1445943A publication Critical patent/GB1445943A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric
    • H01G7/023—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

1445943 Electret transducers SONY CORP 2 July 1974 [5 July 1973] 29335/74 Heading H4J [Also in Division H1] A monocharge film electret suitable for use as the vibrating diaphragm in a headphone or the like is manufactured by mounting a film of electret-forming dielectric material on a metal plate, charging the film by a corona discharge and then heating the film at a temperature between its glass transition temperature and softening point for a period of time such that both major surfaces have a like charge, preferably negative. To reduce the time of heat-treatment the film may be peeled off the plate and placed on a second plate with the same surface exposed prior to heating. The film may be a fluorine containing polymer, e.g. fluorinated ethylene-propylene copolymer.
GB2933574A 1973-07-05 1974-07-02 Methods of making electrets Expired GB1445943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7602773A JPS5650408B2 (en) 1973-07-05 1973-07-05

Publications (1)

Publication Number Publication Date
GB1445943A true GB1445943A (en) 1976-08-11

Family

ID=13593326

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2933574A Expired GB1445943A (en) 1973-07-05 1974-07-02 Methods of making electrets

Country Status (7)

Country Link
US (1) US3924324A (en)
JP (1) JPS5650408B2 (en)
CA (1) CA1008187A (en)
DE (1) DE2432377C2 (en)
FR (1) FR2236259B1 (en)
GB (1) GB1445943A (en)
NL (1) NL181062C (en)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2627249A1 (en) * 1976-06-18 1977-12-29 Battelle Institut E V STORAGE ELEMENT FOR ERASABLE, DIGITAL PERMANENT MEMORY
US4127681A (en) * 1976-09-24 1978-11-28 Pennwalt Corporation Single electrode poling of dielectric films
DE2643260C2 (en) * 1976-09-25 1979-02-15 Elektro-Thermit Gmbh, 4300 Essen Movable, portable device for working off excess weld metal when welding rails
US4248808A (en) * 1978-12-29 1981-02-03 Bell Telephone Laboratories, Incorporated Technique for removing surface and volume charges from thin high polymer films
FR2446045A1 (en) * 1979-01-04 1980-08-01 Thomson Csf PIEZOELECTRIC TRANSDUCER WITH POLYMER ELEMENT AND MANUFACTURING METHOD THEREOF
NL7907539A (en) * 1979-10-11 1981-04-14 Tno METHOD FOR MANUFACTURING ELECTRETS
CA1141020A (en) * 1979-10-19 1983-02-08 Slawomir W. Sapieha Electrets from plasma polymerized material
US4397702A (en) * 1980-01-09 1983-08-09 Johnson Controls, Inc. Fabrication of non-conductive charged sensing probe unit
US4308223A (en) * 1980-03-24 1981-12-29 Albany International Corp. Method for producing electret fibers for enhancement of submicron aerosol filtration
US4365283A (en) * 1980-10-16 1982-12-21 Pennwalt Corporation Corona discharge poling process
US4527218A (en) * 1981-06-08 1985-07-02 At&T Bell Laboratories Stable positively charged Teflon electrets
US4451736A (en) * 1982-04-16 1984-05-29 Wisconsin Alumni Research Foundation Method and apparatus for measuring air ion concentrations
US4513049A (en) * 1983-04-26 1985-04-23 Mitsui Petrochemical Industries, Ltd. Electret article
JPS62160919U (en) * 1986-03-31 1987-10-13
US5045747A (en) * 1990-02-28 1991-09-03 Industrial Technology Research Institute Apparatus for poling a piezoelectric ceramic
CA2037942A1 (en) * 1990-03-12 1991-09-13 Satoshi Matsuura Process for producing an electret, a film electret, and an electret filter
US5652609A (en) * 1993-06-09 1997-07-29 J. David Scholler Recording device using an electret transducer
AU2923397A (en) * 1996-04-18 1997-11-07 California Institute Of Technology Thin film electret microphone
US5952645A (en) * 1996-08-27 1999-09-14 California Institute Of Technology Light-sensing array with wedge-like reflective optical concentrators
ATA80098A (en) * 1998-05-12 1999-06-15 Johannes Dr Heitz THIN ELECTRIC LAYERS AND A METHOD FOR THEIR PRODUCTION
DK79198A (en) * 1998-06-11 1999-12-12 Microtronic As Process for producing a transducer with a membrane having a predetermined clamping force
AU5030100A (en) * 1999-05-19 2000-12-05 California Institute Of Technology High performance mems thin-film teflon electret microphone
JP2001122996A (en) * 1999-10-28 2001-05-08 Bridgestone Corp Surface treatment of fluorine resin and production of laminated body
US7280014B2 (en) 2001-03-13 2007-10-09 Rochester Institute Of Technology Micro-electro-mechanical switch and a method of using and making thereof
AU2002303933A1 (en) 2001-05-31 2002-12-09 Rochester Institute Of Technology Fluidic valves, agitators, and pumps and methods thereof
WO2002100551A1 (en) * 2001-06-11 2002-12-19 Rochester Institute Of Technology An electrostatic filter and a method thereof
US7378775B2 (en) 2001-10-26 2008-05-27 Nth Tech Corporation Motion based, electrostatic power source and methods thereof
US7211923B2 (en) 2001-10-26 2007-05-01 Nth Tech Corporation Rotational motion based, electrostatic power source and methods thereof
US7217582B2 (en) 2003-08-29 2007-05-15 Rochester Institute Of Technology Method for non-damaging charge injection and a system thereof
US7287328B2 (en) 2003-08-29 2007-10-30 Rochester Institute Of Technology Methods for distributed electrode injection
US8581308B2 (en) 2004-02-19 2013-11-12 Rochester Institute Of Technology High temperature embedded charge devices and methods thereof
JP4810661B2 (en) * 2006-04-27 2011-11-09 国立大学法人埼玉大学 Electromechanical transducer and method for manufacturing the same
US9285930B2 (en) * 2007-05-09 2016-03-15 Wacom Co., Ltd. Electret stylus for touch-sensor device
JP2011181748A (en) * 2010-03-02 2011-09-15 Daikin Industries Ltd Method of manufacturing polarized resin film
BRPI1001408B1 (en) 2010-03-08 2019-06-25 Sabo Industria E Comercio De Autopeças S/A ISSUING WHEEL ASSEMBLY
DE102017101950A1 (en) 2017-02-01 2018-08-02 Achim Limbeck Hemostatic material and method and apparatus for its preparation
US11081285B2 (en) * 2019-05-08 2021-08-03 Deborah Duen Ling Chung Electrically conductive electret and associated electret-based power source and self-powered structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644605A (en) * 1969-02-11 1972-02-22 Bell Telephone Labor Inc Method for producing permanent electret charges in dielectric materials
JPS5019183B1 (en) * 1970-03-10 1975-07-04
JPS5024440B1 (en) * 1970-07-10 1975-08-15
CA992738A (en) * 1971-04-08 1976-07-13 Naohiro Murayama Pyroelectric element of polymer film
FR2144933A5 (en) * 1971-07-02 1973-02-16 Anvar

Also Published As

Publication number Publication date
JPS5025677A (en) 1975-03-18
NL7409136A (en) 1975-01-07
DE2432377A1 (en) 1975-01-23
FR2236259B1 (en) 1977-10-14
DE2432377C2 (en) 1987-10-01
NL181062B (en) 1987-01-02
CA1008187A (en) 1977-04-05
NL181062C (en) 1987-06-01
US3924324A (en) 1975-12-09
FR2236259A1 (en) 1975-01-31
JPS5650408B2 (en) 1981-11-28

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19940701