GB560707A - Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes - Google Patents
Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodesInfo
- Publication number
- GB560707A GB560707A GB17256/42A GB1725642A GB560707A GB 560707 A GB560707 A GB 560707A GB 17256/42 A GB17256/42 A GB 17256/42A GB 1725642 A GB1725642 A GB 1725642A GB 560707 A GB560707 A GB 560707A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- resistance
- starting
- heating
- tube
- 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
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/02—Details
- H05B41/04—Starting switches
- H05B41/06—Starting switches thermal only
Landscapes
- Lasers (AREA)
Abstract
560,707. Control systems for space discharge apparatus. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 4, 1942, No. 17256. Convention date, Dec. 10, 1941. [Class 38 (iv)] To prevent continued attempts to start a defective discharge tube a starting switch 25, 26, controlling an electrode heating circuit and comprising a bimetallic element 25 heated by a resistance 29, whereby the heating circuit, closed at starting, is opened after a time interval to cause an inductance 14 to provide the starting impulse, comprises also a bimetallic element 26 heated by a high resistance 30 in shunt with the switch, whereby repeated operations of the switch produce a progressive movement of both elements 25, 26 in such a direction as to cause eventual contact between element 25 and a contact 31' connected to element 26, whereby the switch 25, 26 is short-circuited. The heating resistance 29 maintains this short circuit until the tube circuit is opened at the switch 15 or the tube is removed..The resistance 30 is arranged for slow heating and cooling. Its temperature-resistance coefficient determines the time available for attempts at starting and may be negative. The switch may operate in air or in an envelope containing hydrogen, helium, or a vacuum. Specifications 542,853 and 560,075 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US560707XA | 1941-12-10 | 1941-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB560707A true GB560707A (en) | 1944-04-17 |
Family
ID=22001964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17256/42A Expired GB560707A (en) | 1941-12-10 | 1942-12-04 | Improvements in and relating to starting devices for electric discharge tubes havingthermionic cathodes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB560707A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243487A (en) * | 1990-04-27 | 1991-10-30 | Chun Shu Chiang | A thermal starter switch for fluorescent lights |
-
1942
- 1942-12-04 GB GB17256/42A patent/GB560707A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2243487A (en) * | 1990-04-27 | 1991-10-30 | Chun Shu Chiang | A thermal starter switch for fluorescent lights |
| GB2243487B (en) * | 1990-04-27 | 1994-11-23 | Chun Shu Chiang | Thermal switch starter for fluorescent lights |
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