GB1575874A - Electret microphone - Google Patents

Electret microphone Download PDF

Info

Publication number
GB1575874A
GB1575874A GB10530/78A GB1053078A GB1575874A GB 1575874 A GB1575874 A GB 1575874A GB 10530/78 A GB10530/78 A GB 10530/78A GB 1053078 A GB1053078 A GB 1053078A GB 1575874 A GB1575874 A GB 1575874A
Authority
GB
United Kingdom
Prior art keywords
film
electret microphone
microphone
fixed electrode
plastics material
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
GB10530/78A
Other languages
English (en)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB1575874A publication Critical patent/GB1575874A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
GB10530/78A 1977-03-23 1978-03-16 Electret microphone Expired GB1575874A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7703355A SE398588B (sv) 1977-03-23 1977-03-23 Temperaturstabil elektretmikrofon

Publications (1)

Publication Number Publication Date
GB1575874A true GB1575874A (en) 1980-10-01

Family

ID=20330819

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10530/78A Expired GB1575874A (en) 1977-03-23 1978-03-16 Electret microphone

Country Status (13)

Country Link
US (1) US4142073A (https=)
AU (1) AU516257B2 (https=)
CA (1) CA1084153A (https=)
CH (1) CH626765A5 (https=)
DE (1) DE2810813A1 (https=)
DK (1) DK142340B (https=)
ES (1) ES468174A1 (https=)
FR (1) FR2385288A1 (https=)
GB (1) GB1575874A (https=)
IT (1) IT1093606B (https=)
NL (1) NL7803009A (https=)
NO (1) NO140450C (https=)
SE (1) SE398588B (https=)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4331840A (en) * 1980-02-22 1982-05-25 Lectret S.A. Electret transducer with tapered acoustic chamber
US4418246A (en) * 1980-10-29 1983-11-29 Tibbetts Industries, Inc. Cell assembly for electret transducer
US5442595A (en) * 1994-04-22 1995-08-15 Xecutek Corporation Capacitance-type ultrasonic transducer
DE19703311A1 (de) * 1997-01-30 1998-08-06 Sennheiser Electronic Grenzflächenmikrofon
DE19715365C2 (de) * 1997-04-11 1999-03-25 Sennheiser Electronic Kondensatormikrofon
US6741709B2 (en) * 2000-12-20 2004-05-25 Shure Incorporated Condenser microphone assembly
US7062058B2 (en) * 2001-04-18 2006-06-13 Sonion Nederland B.V. Cylindrical microphone having an electret assembly in the end cover
JP4181580B2 (ja) 2003-11-20 2008-11-19 松下電器産業株式会社 エレクトレット及びエレクトレットコンデンサー
JP4264103B2 (ja) * 2004-03-03 2009-05-13 パナソニック株式会社 エレクトレットコンデンサーマイクロホン
EP1722595A4 (en) * 2004-03-05 2010-07-28 Panasonic Corp ELECTRET condenser
KR20120034763A (ko) 2009-06-29 2012-04-12 노키아 코포레이션 온도 보상 장치, 방법, 마이크로폰, 전자 장치 및 이동 단말 장치

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328653A (en) * 1966-09-22 1967-06-27 Budd Co Thin film pressure transducer
USRE28420E (en) 1967-05-15 1975-05-13 Blbctret acoustic transducer
US3821490A (en) * 1970-10-09 1974-06-28 Chester C Pond Electroacoustic transducer especially electrostatic speakers and systems
SE362571B (https=) * 1971-12-02 1973-12-10 Ericsson Telefon Ab L M
SE382297B (sv) * 1974-08-15 1976-01-19 Ericsson Telefon Ab L M Forfarande for framstellning av en elektretmikrofon med ett noggrant bestemt luftgap.
US4070741A (en) * 1976-09-27 1978-01-31 Genrad Inc. Method of making an electret acoustic transducer
US4063050A (en) * 1976-12-30 1977-12-13 Industrial Research Products, Inc. Acoustic transducer with improved electret assembly

Also Published As

Publication number Publication date
DK142340B (da) 1980-10-13
NL7803009A (nl) 1978-09-26
DK142340C (https=) 1981-03-23
NO781052L (no) 1978-09-26
NO140450B (no) 1979-05-21
IT1093606B (it) 1985-07-19
AU516257B2 (en) 1981-05-28
FR2385288B1 (https=) 1984-03-23
DK128378A (https=) 1978-09-24
SE398588B (sv) 1977-12-27
AU3425478A (en) 1979-09-20
DE2810813A1 (de) 1978-09-28
NO140450C (no) 1979-08-29
US4142073A (en) 1979-02-27
FR2385288A1 (fr) 1978-10-20
CH626765A5 (https=) 1981-11-30
IT7821534A0 (it) 1978-03-23
CA1084153A (en) 1980-08-19
ES468174A1 (es) 1979-01-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee