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
Authority: FI; Finland
Prior art keywords: frequency requirement; graphic button; electret microphone; teflon; electret
Prior art date: 1974-08-15

Application number

FI752120A

Other languages

English (en)

Finnish (fi)

Swedish (sv)

Other versions

FI752120A (xx

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.)

1974-08-15

Filing date

1975-07-24

Publication date

1980-09-10

1975-07-24 Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M

1976-02-16 Publication of FI752120A publication Critical patent/FI752120A/fi

1980-05-30 Publication of FI57680B publication Critical patent/FI57680B/sv

1980-09-10 Application granted granted Critical

1980-09-10 Publication of FI57680C publication Critical patent/FI57680C/sv

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 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
FI752120A FI752120A (xx)	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 (xx)
DE (1)	DE2532980C3 (xx)
DK (1)	DK147670C (xx)
ES (1)	ES440246A1 (xx)
FI (1)	FI57680C (xx)
FR (1)	FR2282195A1 (xx)
GB (1)	GB1510833A (xx)
IT (1)	IT1042081B (xx)
NL (1)	NL7509703A (xx)
NO (1)	NO136387C (xx)
SE (1)	SE7410408L (xx)

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

1974
- 1974-08-15 SE SE7410408A patent/SE7410408L/ not_active IP Right Cessation
1975
- 1975-07-23 DE DE2532980A patent/DE2532980C3/de not_active Expired
- 1975-07-24 FI FI752120A patent/FI57680C/sv not_active IP Right Cessation
- 1975-08-12 GB GB33607/75A patent/GB1510833A/en not_active Expired
- 1975-08-14 IT IT26359/75A patent/IT1042081B/it active
- 1975-08-14 ES ES440246A patent/ES440246A1/es not_active Expired
- 1975-08-14 FR FR7525443A patent/FR2282195A1/fr active Granted
- 1975-08-14 CH CH1057375A patent/CH589994A5/xx not_active IP Right Cessation
- 1975-08-14 NL NL7509703A patent/NL7509703A/xx not_active Application Discontinuation
- 1975-08-14 DK DK368875A patent/DK147670C/da not_active IP Right Cessation
- 1975-08-14 NO NO752839A patent/NO136387C/no unknown

Also Published As

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

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Legal Events

Date	Code	Title	Description
2004-08-31	MM	Patent lapsed	Owner name: OY L M ERICSSON AB