GB2079055B - Electret device - Google Patents

Electret device

Info

Publication number
GB2079055B
GB2079055B GB8119538A GB8119538A GB2079055B GB 2079055 B GB2079055 B GB 2079055B GB 8119538 A GB8119538 A GB 8119538A GB 8119538 A GB8119538 A GB 8119538A GB 2079055 B GB2079055 B GB 2079055B
Authority
GB
United Kingdom
Prior art keywords
electret device
electret
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
GB8119538A
Other versions
GB2079055A (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
Priority claimed from JP8878080A external-priority patent/JPS5714286A/en
Priority claimed from JP8881680A external-priority patent/JPS5714293A/en
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Publication of GB2079055A publication Critical patent/GB2079055A/en
Application granted granted Critical
Publication of GB2079055B publication Critical patent/GB2079055B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/04—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using capacitive elements
GB8119538A 1980-06-30 1981-06-24 Electret device Expired GB2079055B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8878080A JPS5714286A (en) 1980-06-30 1980-06-30 Electret device
JP8881680A JPS5714293A (en) 1980-06-30 1980-06-30 Electret device

Publications (2)

Publication Number Publication Date
GB2079055A GB2079055A (en) 1982-01-13
GB2079055B true GB2079055B (en) 1985-02-20

Family

ID=26430120

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8119538A Expired GB2079055B (en) 1980-06-30 1981-06-24 Electret device

Country Status (2)

Country Link
DE (1) DE3125776A1 (en)
GB (1) GB2079055B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188105A (en) * 1981-05-14 1982-11-19 Toshiba Corp Electret constituent
DE4409850C2 (en) * 1994-03-22 1999-05-12 Fraunhofer Ges Forschung Information storage unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE928842C (en) * 1953-07-09 1955-06-13 Joachim Dr-Ing Euler Process for making electrets
GB1135737A (en) * 1965-10-23 1900-01-01
JPS4948119B1 (en) * 1969-12-19 1974-12-19
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.
CA1106982A (en) * 1976-09-24 1981-08-11 Oliver S. Sprout, Jr. Polarization of a multi-ply stack of piezoelectric- forming resin pellicles

Also Published As

Publication number Publication date
GB2079055A (en) 1982-01-13
DE3125776A1 (en) 1982-05-27

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Legal Events

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