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 PDFInfo
- 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
Links
- 239000004809 Teflon Substances 0.000 description 13
- 229920006362 Teflon® Polymers 0.000 description 13
- 239000012528 membrane Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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)
Applications Claiming Priority (2)
| 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. |
| SE7410408 | 1974-08-15 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| FI752120A7 FI752120A7 (enrdf_load_html_response) | 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)
Families Citing this family (6)
| 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)
| 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 (enrdf_load_html_response) * | 1971-07-28 | 1976-05-18 | ||
| SE362571B (enrdf_load_html_response) * | 1971-12-02 | 1973-12-10 | Ericsson Telefon Ab L M | |
| NL7210088A (enrdf_load_html_response) * | 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 FR FR7525443A patent/FR2282195A1/fr active Granted
- 1975-08-14 DK DK368875A patent/DK147670C/da not_active IP Right Cessation
- 1975-08-14 ES ES440246A patent/ES440246A1/es not_active Expired
- 1975-08-14 NO NO752839A patent/NO136387C/no unknown
- 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
Also Published As
| Publication number | Publication date |
|---|---|
| DK368875A (da) | 1976-02-16 |
| NO136387C (no) | 1977-08-31 |
| FR2282195A1 (fr) | 1976-03-12 |
| SE382297B (sv) | 1976-01-19 |
| NO136387B (enrdf_load_html_response) | 1977-05-16 |
| DK147670B (da) | 1984-11-05 |
| ES440246A1 (es) | 1977-03-01 |
| FI752120A7 (enrdf_load_html_response) | 1976-02-16 |
| CH589994A5 (enrdf_load_html_response) | 1977-07-29 |
| DE2532980C3 (de) | 1985-07-11 |
| FR2282195B1 (enrdf_load_html_response) | 1979-05-11 |
| DE2532980A1 (de) | 1976-03-04 |
| FI57680B (fi) | 1980-05-30 |
| NL7509703A (nl) | 1976-02-17 |
| GB1510833A (en) | 1978-05-17 |
| IT1042081B (it) | 1980-01-30 |
| SE7410408L (sv) | 1976-01-19 |
| NO752839L (enrdf_load_html_response) | 1976-02-17 |
| DK147670C (da) | 1985-05-20 |
| DE2532980B2 (de) | 1976-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Patent lapsed |
Owner name: OY L M ERICSSON AB |