GB455376A - Improvements in and relating to electric discharge devices - Google Patents
Improvements in and relating to electric discharge devicesInfo
- Publication number
- GB455376A GB455376A GB5346/35A GB534635A GB455376A GB 455376 A GB455376 A GB 455376A GB 5346/35 A GB5346/35 A GB 5346/35A GB 534635 A GB534635 A GB 534635A GB 455376 A GB455376 A GB 455376A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- discharge
- potential
- electrodes
- supply
- 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
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/50—Thermionic-cathode tubes
- H01J17/52—Thermionic-cathode tubes with one cathode and one anode
- H01J17/54—Thermionic-cathode tubes with one cathode and one anode having one or more control electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/40—Cold-cathode tubes with one cathode and one anode, e.g. glow tubes, tuning-indicator glow tubes, voltage-stabiliser tubes, voltage-indicator tubes
Landscapes
- Gas-Filled Discharge Tubes (AREA)
- Discharge Lamp (AREA)
Abstract
455,376. Supply systems for discharge lamps. BRITISH THOMSON - HOUSTON CO., Ltd., Crown House, Aldwych, London. Feb. 19, 1935, No. 5346. Convention date, Feb. 19, 1934. [Class 38 (iv)] [See also Group XL] A gaseous discharge device comprises a sealed envelope 1, Fig. 5, containing a principal discharge - supporting gas and from 0À001 to 3 per cent of an auxiliary gas having an ionizing potential which is less than a metastable potential of the principal gas, a pair of electrodes 8 sealed into the envelope, and a grid 9 extending between the electrodes, the openings in the grid being of such a size that, when a supply potential is applied between the electrodes and the grid is at a predetermined intermediate potential the gas is not ionized and practically no electrons can penetrate through the meshes of the grid, but that when the potential of the grid is disturbed from its intermediate value a discharge is initiated between the electrodes. The device is shown used as a relay in series with a load such as an incandescent lamp 12, Fig. 5, or the coil 25, Fig. 8. A potentiometer 13 of high resistance is connected across the main electrodes and centre-tapped for connection of the grid 9. A switch 14 enables the grid 9 to be connected to one pole of the mains through a resistance 15. Normally, the grid prevents a discharge from occurring between the main electrodes, but when the switch 14 is momentarily closed, a discharge starts between grid 9 and the left-hand electrode 8, the current being limited to a few microamperes by the resistance 15. The resultant ionization neutralizes the field of the grid 9 and enables a discharge to pass between electrodes 8, the excess voltage being available for the load 12. If desired, the potentiometer may be omitted, when the grid assumes a floating potential producing the same effect. In modifications, two or three grids are disposed consecutively between the main electrodes and connected to appropriate points on the potentiometer. The voltage controlled may be thereby increased without materially raising the discharge maintaining potential. When a D.C. supply is being controlled, the grid voltage may be displaced so that advantage is taken of the fact that the grid, especially if coated with aluminium, has a higher breakdown potential with respect to an anode than with respect to a cathode, the relay effect being increased. The modification shown in Fig. 8 employs, instead of cold electrodes, two indirectly heated cathodes 22, two grids 24 being provided between them. A lower discharge-maintaining potential and a higher discharge current are obtained. While shown with A.C. supply, this form may also be used on D.C. supply, with suitable sources of current for heaters 23.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US712031A US2116677A (en) | 1934-02-19 | 1934-02-19 | Gaseous electric discharge device and method of operating the same |
US30593A US2116970A (en) | 1934-02-19 | 1935-07-10 | Gaseous electric discharge device and method of operating same |
Publications (1)
Publication Number | Publication Date |
---|---|
GB455376A true GB455376A (en) | 1936-10-19 |
Family
ID=26706215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5346/35A Expired GB455376A (en) | 1934-02-19 | 1935-02-19 | Improvements in and relating to electric discharge devices |
Country Status (3)
Country | Link |
---|---|
US (1) | US2116970A (en) |
FR (1) | FR785962A (en) |
GB (1) | GB455376A (en) |
-
1935
- 1935-02-19 GB GB5346/35A patent/GB455376A/en not_active Expired
- 1935-02-19 FR FR785962D patent/FR785962A/en not_active Expired
- 1935-07-10 US US30593A patent/US2116970A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2116970A (en) | 1938-05-10 |
FR785962A (en) | 1935-08-23 |
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