GB1340158A - Electret devices - Google Patents
Electret devicesInfo
- Publication number
- GB1340158A GB1340158A GB3492872A GB3492872A GB1340158A GB 1340158 A GB1340158 A GB 1340158A GB 3492872 A GB3492872 A GB 3492872A GB 3492872 A GB3492872 A GB 3492872A GB 1340158 A GB1340158 A GB 1340158A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electret
- july
- projections
- electrets
- dome
- 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
Links
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- -1 polypropylene Polymers 0.000 abstract 2
- 239000004812 Fluorinated ethylene propylene Substances 0.000 abstract 1
- 239000004743 Polypropylene Substances 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 238000004049 embossing Methods 0.000 abstract 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 229910052763 palladium Inorganic materials 0.000 abstract 1
- 229920009441 perflouroethylene propylene Polymers 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 229920001155 polypropylene Polymers 0.000 abstract 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Filtering Materials (AREA)
Abstract
1340158 Electrets TOKYO SHIBAURA ELECTRIC CO Ltd 26 July 1972 [28 July 1971] 34928/72 Heading H1M [Also in Division H4] An electret is manufactured from polymeric material having at least one surface roughened by the provision of uniformly arranged projections or recesses, the height or depth of which is 10 to 90% of the total thickness. The material may be polypropylene, P.T.F.E., or fluorinated ethylene propylene copolymer. As shown polymer layer 10 has projections 16 formed by embossing surface 12, the other surface being coated with aluminium or palladium before or after the electret-forming process. The electret may be cylindrical or dome-shaped (Figs. 7, 8, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5601771A JPS5115599B1 (en) | 1971-07-28 | 1971-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1340158A true GB1340158A (en) | 1973-12-12 |
Family
ID=13015277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3492872A Expired GB1340158A (en) | 1971-07-28 | 1972-07-26 | Electret devices |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5115599B1 (en) |
| DE (1) | DE2237413A1 (en) |
| FR (1) | FR2147264B1 (en) |
| GB (1) | GB1340158A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2532980A1 (en) * | 1974-08-15 | 1976-03-04 | Ericsson Telefon Ab L M | PROCESS FOR PRODUCING AN ELECTRETIC MICROPHONE WITH EXACTLY DETERMINED AIR GAP |
| US4356049A (en) | 1979-05-25 | 1982-10-26 | Tokyo Shibaura Denki Kabushiki Kaisha | Method of manufacturing an electret device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT374326B (en) * | 1982-07-22 | 1984-04-10 | Akg Akustische Kino Geraete | ELECTROSTATIC CONVERTER, ESPECIALLY CONDENSER MICROPHONE |
-
1971
- 1971-07-28 JP JP5601771A patent/JPS5115599B1/ja active Pending
-
1972
- 1972-07-26 GB GB3492872A patent/GB1340158A/en not_active Expired
- 1972-07-27 FR FR7227119A patent/FR2147264B1/fr not_active Expired
- 1972-07-27 DE DE19722237413 patent/DE2237413A1/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2532980A1 (en) * | 1974-08-15 | 1976-03-04 | Ericsson Telefon Ab L M | PROCESS FOR PRODUCING AN ELECTRETIC MICROPHONE WITH EXACTLY DETERMINED AIR GAP |
| US4356049A (en) | 1979-05-25 | 1982-10-26 | Tokyo Shibaura Denki Kabushiki Kaisha | Method of manufacturing an electret device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5115599B1 (en) | 1976-05-18 |
| FR2147264A1 (en) | 1973-03-09 |
| DE2237413A1 (en) | 1973-02-08 |
| FR2147264B1 (en) | 1976-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |