FI57680C - Foerfarande foer framstaellning av en elektret-mikrofon med ett noggrant bestaemt luftgap - Google Patents

Foerfarande foer framstaellning av en elektret-mikrofon med ett noggrant bestaemt luftgap Download PDF

Info

Publication number
FI57680C
FI57680C FI752120A FI752120A FI57680C FI 57680 C FI57680 C FI 57680C FI 752120 A FI752120 A FI 752120A FI 752120 A FI752120 A FI 752120A FI 57680 C FI57680 C FI 57680C
Authority
FI
Finland
Prior art keywords
frequency requirement
graphic button
electret microphone
teflon
electret
Prior art date
Application number
FI752120A
Other languages
English (en)
Swedish (sv)
Other versions
FI752120A (fi
FI57680B (fi
Inventor
Nils Aoke Martin Andersson
Rolf Bertil Goeran 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 FI752120A publication Critical patent/FI752120A/fi
Application granted granted Critical
Publication of FI57680B publication Critical patent/FI57680B/fi
Publication of FI57680C publication Critical patent/FI57680C/fi

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
    • 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
    • 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)
FI752120A 1974-08-15 1975-07-24 Foerfarande foer framstaellning av en elektret-mikrofon med ett noggrant bestaemt luftgap FI57680C (fi)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7410408 1974-08-15
SE7410408A SE382297B (sv) 1974-08-15 1974-08-15 Forfarande for framstellning av en elektretmikrofon med ett noggrant bestemt luftgap.

Publications (3)

Publication Number Publication Date
FI752120A FI752120A (fi) 1976-02-16
FI57680B FI57680B (fi) 1980-05-30
FI57680C true FI57680C (fi) 1980-09-10

Family

ID=20321900

Family Applications (1)

Application Number Title Priority Date Filing Date
FI752120A FI57680C (fi) 1974-08-15 1975-07-24 Foerfarande foer framstaellning av en elektret-mikrofon med ett noggrant bestaemt luftgap

Country Status (11)

Country Link
CH (1) CH589994A5 (fi)
DE (1) DE2532980C3 (fi)
DK (1) DK147670C (fi)
ES (1) ES440246A1 (fi)
FI (1) FI57680C (fi)
FR (1) FR2282195A1 (fi)
GB (1) GB1510833A (fi)
IT (1) IT1042081B (fi)
NL (1) NL7509703A (fi)
NO (1) NO136387C (fi)
SE (1) SE382297B (fi)

Families Citing this family (4)

* 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
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 (fi) * 1971-07-28 1976-05-18
SE362571B (fi) * 1971-12-02 1973-12-10 Ericsson Telefon Ab L M
NL7210088A (fi) * 1972-07-21 1974-01-23

Also Published As

Publication number Publication date
FR2282195B1 (fi) 1979-05-11
NO136387C (no) 1977-08-31
DK147670C (da) 1985-05-20
FI752120A (fi) 1976-02-16
FR2282195A1 (fr) 1976-03-12
DK147670B (da) 1984-11-05
NO752839L (fi) 1976-02-17
DK368875A (da) 1976-02-16
NL7509703A (nl) 1976-02-17
NO136387B (fi) 1977-05-16
DE2532980A1 (de) 1976-03-04
SE7410408L (sv) 1976-01-19
DE2532980B2 (de) 1976-08-05
DE2532980C3 (de) 1985-07-11
FI57680B (fi) 1980-05-30
ES440246A1 (es) 1977-03-01
SE382297B (sv) 1976-01-19
IT1042081B (it) 1980-01-30
CH589994A5 (fi) 1977-07-29
GB1510833A (en) 1978-05-17

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Owner name: OY L M ERICSSON AB