GB1394347A - Electret foil - Google Patents

Electret foil

Info

Publication number
GB1394347A
GB1394347A GB3417073A GB3417073A GB1394347A GB 1394347 A GB1394347 A GB 1394347A GB 3417073 A GB3417073 A GB 3417073A GB 3417073 A GB3417073 A GB 3417073A GB 1394347 A GB1394347 A GB 1394347A
Authority
GB
United Kingdom
Prior art keywords
july
electrets
electret foil
layer
foil
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
GB3417073A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1394347A publication Critical patent/GB1394347A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Laminated Bodies (AREA)

Abstract

1394347 Electrets PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 18 July 1973 [21 July 1972] 34170/73 Heading H1M [Also in Division H4] Robust foil electrets comprise a layer of electretized material, e.g. PTFE, FEP, deposited on a substrate layer of material having a higher elastic limit, e.g. polyimide.
GB3417073A 1972-07-21 1973-07-18 Electret foil Expired GB1394347A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7210088A NL7210088A (en) 1972-07-21 1972-07-21

Publications (1)

Publication Number Publication Date
GB1394347A true GB1394347A (en) 1975-05-14

Family

ID=19816577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3417073A Expired GB1394347A (en) 1972-07-21 1973-07-18 Electret foil

Country Status (8)

Country Link
JP (2) JPS4946426A (en)
AT (1) AT326197B (en)
DE (1) DE2333418C2 (en)
FR (1) FR2194028B1 (en)
GB (1) GB1394347A (en)
IN (1) IN139061B (en)
IT (1) IT991799B (en)
NL (1) NL7210088A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022630A1 (en) * 1979-07-06 1981-01-21 The Post Office Method and apparatus for implanting a charge in an electret foil
WO2008102063A1 (en) 2007-02-23 2008-08-28 Panphonics Oy Acoustic actuator plate structure

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL179104C (en) * 1974-03-15 1986-07-01 Philips Nv ELECTROSTATIC TRANSDUCENT.
JPS5112125A (en) * 1974-07-19 1976-01-30 Matsushita Electric Ind Co Ltd EREKUTORETSUTODENKIONKYOHENKANKI
SE7410408L (en) * 1974-08-15 1976-01-19 Ericsson Telefon Ab L M PROCEDURE FOR MANUFACTURING AN ELECTRIC MICROPHONE WITH A CAREFULLY DETERMINED AIR GAP.
JPS5430300B1 (en) * 1975-01-21 1979-09-29
JPS5814317B2 (en) * 1976-04-20 1983-03-18 松下電器産業株式会社 electrically sensitive recording paper
DE102008013942A1 (en) * 2008-03-12 2009-09-17 Nanogate Ag Electret coating on a substrate, useful e.g. for finishing textiles and carpets, producing filters, preferably for filtering air and water, and in sensors, comprises non-magnetic particles with inorganic coating and/or magnetic particles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1789091B2 (en) * 1967-05-15 1974-04-04 Thermo Electron Corp., Waltham, Mass. (V.St.A.) Electret and process and apparatus for its manufacture. Eliminated from: 1639444
NL143362B (en) * 1968-07-10 1974-09-16 Tno METHOD OF FORMING A ONE-SIDED METALLIZED ELECTRICAL PHOELY, AND SUCH AN ELECTRICAL FOELY FORMED ACCORDING TO THIS METHOD.
GB1302590A (en) * 1969-09-10 1973-01-10
JPS4857614A (en) * 1971-11-17 1973-08-13

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022630A1 (en) * 1979-07-06 1981-01-21 The Post Office Method and apparatus for implanting a charge in an electret foil
WO2008102063A1 (en) 2007-02-23 2008-08-28 Panphonics Oy Acoustic actuator plate structure
CN101636264B (en) * 2007-02-23 2013-08-07 潘菲尼克斯公司 Acoustic actuator plate structure
US9301055B2 (en) 2007-02-23 2016-03-29 Panphonics Oy Acoustic actuator plate structure

Also Published As

Publication number Publication date
IT991799B (en) 1975-08-30
AT326197B (en) 1975-11-25
FR2194028A1 (en) 1974-02-22
ATA633673A (en) 1975-02-15
DE2333418A1 (en) 1974-01-31
DE2333418C2 (en) 1985-01-10
FR2194028B1 (en) 1977-02-18
JPS55133699U (en) 1980-09-22
NL7210088A (en) 1974-01-23
IN139061B (en) 1976-05-01
JPS4946426A (en) 1974-05-04

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee