GB1340158A - Electret devices - Google Patents

Electret devices

Info

Publication number
GB1340158A
GB1340158A GB3492872A GB3492872A GB1340158A GB 1340158 A GB1340158 A GB 1340158A GB 3492872 A GB3492872 A GB 3492872A GB 3492872 A GB3492872 A GB 3492872A GB 1340158 A GB1340158 A GB 1340158A
Authority
GB
United Kingdom
Prior art keywords
electret
july
projections
electrets
dome
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
GB3492872A
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co 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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Publication of GB1340158A publication Critical patent/GB1340158A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Filtering Materials (AREA)
GB3492872A 1971-07-28 1972-07-26 Electret devices Expired GB1340158A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5601771A JPS5115599B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1971-07-28 1971-07-28

Publications (1)

Publication Number Publication Date
GB1340158A true GB1340158A (en) 1973-12-12

Family

ID=13015277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3492872A Expired GB1340158A (en) 1971-07-28 1972-07-26 Electret devices

Country Status (4)

Country Link
JP (1) JPS5115599B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2237413A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2147264B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1340158A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2532980A1 (de) * 1974-08-15 1976-03-04 Ericsson Telefon Ab L M Verfahren zur herstellung eines elektretmikrophons mit genau bestimmtem luftspalt
US4356049A (en) 1979-05-25 1982-10-26 Tokyo Shibaura Denki Kabushiki Kaisha Method of manufacturing an electret device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT374326B (de) * 1982-07-22 1984-04-10 Akg Akustische Kino Geraete Elektrostatischer wandler, insbesondere kondensatormikrophon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2532980A1 (de) * 1974-08-15 1976-03-04 Ericsson Telefon Ab L M Verfahren zur herstellung eines elektretmikrophons mit genau bestimmtem luftspalt
US4356049A (en) 1979-05-25 1982-10-26 Tokyo Shibaura Denki Kabushiki Kaisha Method of manufacturing an electret device

Also Published As

Publication number Publication date
JPS5115599B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-05-18
DE2237413A1 (de) 1973-02-08
FR2147264B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-03-12
FR2147264A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-03-09

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee