GB788614A - Improvements in or relating to variable capacitors - Google Patents
Improvements in or relating to variable capacitorsInfo
- Publication number
- GB788614A GB788614A GB1872155A GB1872155A GB788614A GB 788614 A GB788614 A GB 788614A GB 1872155 A GB1872155 A GB 1872155A GB 1872155 A GB1872155 A GB 1872155A GB 788614 A GB788614 A GB 788614A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- plates
- june
- variable capacitors
- sintering
- 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
- 239000003990 capacitor Substances 0.000 title abstract 3
- 238000000576 coating method Methods 0.000 abstract 6
- 239000011248 coating agent Substances 0.000 abstract 5
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 238000005245 sintering Methods 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 238000005530 etching Methods 0.000 abstract 1
- 229920001903 high density polyethylene Polymers 0.000 abstract 1
- 239000004700 high-density polyethylene Substances 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000004816 latex Substances 0.000 abstract 1
- 229920000126 latex Polymers 0.000 abstract 1
- 229920001684 low density polyethylene Polymers 0.000 abstract 1
- 239000004702 low-density polyethylene Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- -1 polytetrafluoroethylene Polymers 0.000 abstract 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract 1
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract 1
- 239000005871 repellent 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
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/04—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode
- H01G5/06—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode due to rotation of flat or substantially flat electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
788,614. Variable capacitors. BRITISH DIELECTRIC RESEARCH, Ltd. June 27, 1956 [June 28, 1955], No. 18721/55. Class 37. In a variable capacitor, inter-electrode spacing is reduced by coating one or both sets of plates with a non- hygroscopic, moisture-repellent insulating material having a low coefficient of friction with itself or with metal. As shown, the edges of the interleaving portions are rounded by mechanical, chemical or electro-chemical polishing or may be etched away after coating. The plates may be from 0.01 to 0.1 inch thick, of porous metal, or may be surface-etched to provide a key. Aluminium plates may be anodised. The insulating coating may take the form of polytetrafluoroethylene latex which is afterwards sintered. The coating and sintering processes can be repeated alternately to provide greater thickness; any edge etching is carried out after sintering the first coating. Alternatively, high or low density polyethylene may be applied in molten state or in the form of a solution at elevated temperature. The coatings are preferably 0.125 to 10 mil. thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1872155A GB788614A (en) | 1955-06-28 | 1955-06-28 | Improvements in or relating to variable capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1872155A GB788614A (en) | 1955-06-28 | 1955-06-28 | Improvements in or relating to variable capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB788614A true GB788614A (en) | 1958-01-02 |
Family
ID=10117269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1872155A Expired GB788614A (en) | 1955-06-28 | 1955-06-28 | Improvements in or relating to variable capacitors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB788614A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3217217A (en) * | 1965-11-09 | Variable capacitor with vane spacing means | ||
| US3818287A (en) * | 1972-10-30 | 1974-06-18 | Alps Electric Co Ltd | Variable condenser |
| USRE28611E (en) * | 1971-10-30 | 1975-11-11 | Variable condenser | |
| US3949280A (en) * | 1975-02-18 | 1976-04-06 | Mitsumi Electric Co., Ltd. | Miniature variable capacitor and method of manufacture |
| US4089093A (en) * | 1974-10-22 | 1978-05-16 | U.S. Philips Corporation | Method of manufacturing a variable capacitor |
| EP2654052A3 (en) * | 2012-01-31 | 2018-03-28 | Sumitomo Heavy Industries, Ltd. | Rotary capacitor |
-
1955
- 1955-06-28 GB GB1872155A patent/GB788614A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3217217A (en) * | 1965-11-09 | Variable capacitor with vane spacing means | ||
| USRE28611E (en) * | 1971-10-30 | 1975-11-11 | Variable condenser | |
| US3818287A (en) * | 1972-10-30 | 1974-06-18 | Alps Electric Co Ltd | Variable condenser |
| US4089093A (en) * | 1974-10-22 | 1978-05-16 | U.S. Philips Corporation | Method of manufacturing a variable capacitor |
| US3949280A (en) * | 1975-02-18 | 1976-04-06 | Mitsumi Electric Co., Ltd. | Miniature variable capacitor and method of manufacture |
| EP2654052A3 (en) * | 2012-01-31 | 2018-03-28 | Sumitomo Heavy Industries, Ltd. | Rotary capacitor |
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