NO136387B - - Google Patents

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Publication number
NO136387B
NO136387B NO752839A NO752839A NO136387B NO 136387 B NO136387 B NO 136387B NO 752839 A NO752839 A NO 752839A NO 752839 A NO752839 A NO 752839A NO 136387 B NO136387 B NO 136387B
Authority
NO
Norway
Prior art keywords
electret microphone
teflon
film
electret
plastic film
Prior art date
Application number
NO752839A
Other languages
English (en)
Norwegian (no)
Other versions
NO752839L (ref
NO136387C (no
Inventor
N A M Andersson
R B G Joensson
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of NO752839L publication Critical patent/NO752839L/no
Publication of NO136387B publication Critical patent/NO136387B/no
Publication of NO136387C publication Critical patent/NO136387C/no

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
    • 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)
NO752839A 1974-08-15 1975-08-14 Fremgangsm}te for fremstilling av en elektretmikrofon med et n¦yaktig bestemt luftgap NO136387C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7410408A SE7410408L (sv) 1974-08-15 1974-08-15 Forfarande for framstellning av en elektretmikrofon med ett noggrant bestemt luftgap.

Publications (3)

Publication Number Publication Date
NO752839L NO752839L (ref) 1976-02-17
NO136387B true NO136387B (ref) 1977-05-16
NO136387C NO136387C (no) 1977-08-31

Family

ID=20321900

Family Applications (1)

Application Number Title Priority Date Filing Date
NO752839A NO136387C (no) 1974-08-15 1975-08-14 Fremgangsm}te for fremstilling av en elektretmikrofon med et n¦yaktig bestemt luftgap

Country Status (11)

Country Link
CH (1) CH589994A5 (ref)
DE (1) DE2532980C3 (ref)
DK (1) DK147670C (ref)
ES (1) ES440246A1 (ref)
FI (1) FI57680C (ref)
FR (1) FR2282195A1 (ref)
GB (1) GB1510833A (ref)
IT (1) IT1042081B (ref)
NL (1) NL7509703A (ref)
NO (1) NO136387C (ref)
SE (1) SE7410408L (ref)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE398588B (sv) * 1977-03-23 1977-12-27 Ericsson Telefon Ab L M Temperaturstabil elektretmikrofon
GB2079055B (en) * 1980-06-30 1985-02-20 Tokyo Shibaura Electric Co Electret device
US4365283A (en) 1980-10-16 1982-12-21 Pennwalt Corporation Corona discharge poling process
US4418246A (en) 1980-10-29 1983-11-29 Tibbetts Industries, Inc. Cell assembly for electret transducer
GB2136207B (en) * 1983-03-07 1987-06-17 Harold Wilson Meredith Pook Manufacture of electrets
DE3927254A1 (de) * 1989-08-18 1991-02-21 Reifenhaeuser Masch Verfahren und spinnduesenaggregat fuer die herstellung von kunststoff-faeden und/oder kunststoff-fasern im zuge der herstellung von einem spinnvlies aus thermoplastischem kunststoff

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA832651A (en) * 1970-01-20 Thermo Electron Corporation Electroacoustic transducers and method of making the same
DE844306C (de) * 1948-10-02 1952-07-17 Siemens Ag Kondensatormikrophon mit sehr kleinem Abstand zwischen Membran und Gegenflaeche
FR1324076A (fr) * 1962-05-30 1963-04-12 Accumulatoren Fabrik Ag Accumulateur dont l'énergie électrique est accumulée dans un diélectrique et procédé pour sa fabrication
US3373251A (en) * 1965-02-23 1968-03-12 Shure Bros Electrostatic transducer
NL146969B (nl) * 1969-11-12 1975-08-15 Tno Verbetering van werkwijze voor het formeren van een eenzijdig gemetalliseerde elektreetfoelie.
JPS5115599B1 (ref) * 1971-07-28 1976-05-18
SE362571B (ref) * 1971-12-02 1973-12-10 Ericsson Telefon Ab L M
NL7210088A (ref) * 1972-07-21 1974-01-23

Also Published As

Publication number Publication date
FR2282195A1 (fr) 1976-03-12
FR2282195B1 (ref) 1979-05-11
FI57680B (fi) 1980-05-30
DE2532980B2 (de) 1976-08-05
FI57680C (fi) 1980-09-10
NO752839L (ref) 1976-02-17
SE382297B (sv) 1976-01-19
DK147670C (da) 1985-05-20
IT1042081B (it) 1980-01-30
NL7509703A (nl) 1976-02-17
DE2532980C3 (de) 1985-07-11
SE7410408L (sv) 1976-01-19
CH589994A5 (ref) 1977-07-29
NO136387C (no) 1977-08-31
FI752120A7 (ref) 1976-02-16
DE2532980A1 (de) 1976-03-04
DK147670B (da) 1984-11-05
DK368875A (da) 1976-02-16
ES440246A1 (es) 1977-03-01
GB1510833A (en) 1978-05-17

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