GB1230403A - - Google Patents
Info
- Publication number
- GB1230403A GB1230403A GB1230403DA GB1230403A GB 1230403 A GB1230403 A GB 1230403A GB 1230403D A GB1230403D A GB 1230403DA GB 1230403 A GB1230403 A GB 1230403A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- electrode
- furnace
- ionized gas
- polyhalocarbon
- 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
- 239000000463 material Substances 0.000 abstract 4
- 229920001577 copolymer Polymers 0.000 abstract 2
- 239000004642 Polyimide Substances 0.000 abstract 1
- 239000004721 Polyphenylene oxide Substances 0.000 abstract 1
- 239000004793 Polystyrene Substances 0.000 abstract 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000003989 dielectric material Substances 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000000178 monomer Substances 0.000 abstract 1
- 229920002492 poly(sulfone) Polymers 0.000 abstract 1
- 239000004417 polycarbonate Substances 0.000 abstract 1
- 229920000515 polycarbonate Polymers 0.000 abstract 1
- -1 polyhalocarbon Polymers 0.000 abstract 1
- 229920001721 polyimide Polymers 0.000 abstract 1
- 229920006380 polyphenylene oxide Polymers 0.000 abstract 1
- 229920002223 polystyrene Polymers 0.000 abstract 1
- 229920000131 polyvinylidene Polymers 0.000 abstract 1
- 239000005033 polyvinylidene chloride Substances 0.000 abstract 1
- 229920001169 thermoplastic Polymers 0.000 abstract 1
- 239000004416 thermosoftening plastic Substances 0.000 abstract 1
Classifications
-
- 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
- H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric
- H01G7/023—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
1,230,403. Electrets. THERMO ELECTRON CORP. 2 April, 1968 [15 May, 1967], No. 54356/70. Divided out of 1,230,402. Heading H1M. In the manufacture of an electret, a film 1 of thermoplastic dielectric material is supported within furnace 3 between electrode 5 in contact with one surface and grid electrode 7 spaced from the other surface, the material is heated to a softening temperature and a D.C. potential applied between the electrodes while an ionized gas is provided between film 1 and electrode 7 and, after the material has become charged, it is cooled to room temperature while maintaining the field and ionized gas. As shown the furnace may be heated by induction coil 11 which also ionizes the air or other gas in the furnace. The bulk polarized material may be given a surface charge by increasing the D.C. bias in the presence of ionized gas, or by rubbing the film with material of opposite charge selectivity. The film 1 may be polycarbonate, polysulphone, polyimide, polyhalocarbon, polyphenylene oxide, polyvinylidene oxide or copolymers thereof. The film may have a surface coating of polystyrene, polyhalocarbon or polyvinylidene chloride or copolymer of their monomers to improve the surface charge. Electrode 5 may be a metallized layer. For use in a transducer the formed electret has a metallized layer or is bonded to a metal film.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63846367A | 1967-05-15 | 1967-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1230403A true GB1230403A (en) | 1971-05-05 |
Family
ID=24560137
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1230403D Expired GB1230403A (en) | 1967-05-15 | 1968-04-02 | |
| GB1230402D Expired GB1230402A (en) | 1967-05-15 | 1968-04-02 | |
| GB1230404D Expired GB1230404A (en) | 1967-05-15 | 1968-04-02 |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1230402D Expired GB1230402A (en) | 1967-05-15 | 1968-04-02 | |
| GB1230404D Expired GB1230404A (en) | 1967-05-15 | 1968-04-02 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5025160B1 (en) |
| DE (1) | DE1639444B2 (en) |
| GB (3) | GB1230403A (en) |
| NL (1) | NL167542C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU181900U1 (en) * | 2018-04-16 | 2018-07-26 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | DEVICE FOR PRODUCING ELECTRETHES |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4815868B1 (en) * | 1969-08-28 | 1973-05-17 | ||
| JPS5121334B2 (en) * | 1971-08-27 | 1976-07-01 | ||
| CA989514A (en) * | 1972-09-08 | 1976-05-18 | Loh-Yi Chang | Electromechanical transducer and method of making same |
| AT323257B (en) * | 1973-06-26 | 1975-07-10 | Akg Akustische Kino Geraete | CONDENSER MICROPHONE |
| JPS5130997A (en) * | 1974-09-11 | 1976-03-16 | Kureha Chemical Ind Co Ltd | Kobunshifuirumu no renzokuseikyokuhoho |
| US4085297A (en) * | 1977-06-13 | 1978-04-18 | Polaroid Corporation | Spring force biasing means for electroacoustical transducer components |
| JPS57188105A (en) * | 1981-05-14 | 1982-11-19 | Toshiba Corp | Electret constituent |
| JP5691085B2 (en) * | 2012-07-25 | 2015-04-01 | 株式会社ビスキャス | Vibration generator and power generation method using the same |
| KR102337495B1 (en) | 2019-12-20 | 2021-12-09 | 삼성에스디아이 주식회사 | Detecting system for control circuit of load |
-
1968
- 1968-01-16 DE DE19681639444 patent/DE1639444B2/en active Pending
- 1968-04-02 GB GB1230403D patent/GB1230403A/en not_active Expired
- 1968-04-02 GB GB1230402D patent/GB1230402A/en not_active Expired
- 1968-04-02 GB GB1230404D patent/GB1230404A/en not_active Expired
- 1968-04-25 NL NL6805919A patent/NL167542C/en not_active IP Right Cessation
-
1969
- 1969-12-19 JP JP10174669A patent/JPS5025160B1/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU181900U1 (en) * | 2018-04-16 | 2018-07-26 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | DEVICE FOR PRODUCING ELECTRETHES |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1639444A1 (en) | 1971-04-22 |
| NL167542B (en) | 1981-07-16 |
| GB1230404A (en) | 1971-05-05 |
| JPS5025160B1 (en) | 1975-08-21 |
| NL167542C (en) | 1981-12-16 |
| DE1639444B2 (en) | 1972-08-03 |
| GB1230402A (en) | 1971-05-05 |
| NL6805919A (en) | 1968-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |