GB499897A - Improvements in auxiliary electrodes in electric discharge devices - Google Patents
Improvements in auxiliary electrodes in electric discharge devicesInfo
- Publication number
- GB499897A GB499897A GB23431/37A GB2343137A GB499897A GB 499897 A GB499897 A GB 499897A GB 23431/37 A GB23431/37 A GB 23431/37A GB 2343137 A GB2343137 A GB 2343137A GB 499897 A GB499897 A GB 499897A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- envelope
- tungsten
- quartz
- sealed
- 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
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/366—Seals for leading-in conductors
Abstract
499,897. Sealing leading-in conductors; discharge lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. f³r Elektrische Gl³hlampen) Aug. 26, 1937, Nos. 23431/37, 31334/37, and 5409/38. [Class 36] [Also in Group XL] In a high-pressure mercury vapour-discharge device having a quartz or other hard glass envelope and,comprising at least one auxiliary electrode located near one of a pair of main electrodes, the auxiliary electrode is constituted by the inner end of a thin adherent metallic layer extending along a vitreous rod or tube passing through the wall of the envelope, the remainder of the layer serving as a lead to the auxiliary electrode. The layer, which is preferably of tungsten or molybdenum, may be of high resistance so that the normal series resistor for the auxiliary electrode is necessary. The layer may be partially oxidized to increase its resistance. In the construction shown in Fig. 1 a quartz rod 4 coated with a tungsten layer 3 is sealed into one end 2 of a tubular quartz envelope 1, the inner end of the rod carrying a main electrode 5 consisting of a tungsten helix coated with or enclosing thermionically active material, the helix having spaced turns 5<1> which are wrapped around the layer 3 and sealed between this layer and the tubular end of the envelope. The layer 3 serves as a lead to the electrode 5. At the upper end of the envelope a main electrode 5 is similarly attached to the end of a quartz tube 9 which is coated with a tungsten layer 11 and seated in a tubular end 2 of the envelope. Within the tube 9 is sealed a tungsten-coated quartz rod 8, the inner end of the rod projecting into the main electrode so that the end of the coating 10 thereon may act as an auxiliary electrode whilst the remainder of the coating serves as a lead to that electrode. External connection to the tungsten coatings 3, 9, 10 is effected by clamps 7, 14, 15 which engage wrappings of wire arranged on the ends of the coatings. In a modified construction a main electrode is carried by a tungsten or molybdenum strip sealed within a flat quartz tube the outer surface of the tube being tungstencoated so as to constitute an auxiliary electrode and the lead thereto. The tube is sealed into the end of the envelope of the discharge device with the inner end of the coating projecting into an enlarged portion of the envelope. As shown in Fig. 4, tungsten-coated quartz rods 4 connected by a quartz strip 19 and carrying main electrodes 5 are sealed into the envelope 1 of the discharge device. The tungsten layer 3 on the lower rod is extended over the strip 19 to form an auxiliary electrode 3<1>. Fig. 5 shows a construction in which the lower end of the envelope 1 is sealed by a metal-coated quartz rod 8, the coating being circumferentially divided to form a main layer 11 and a narrow strip 10 which is separated from the layer 11 by gaps 20. The layer 11 serves as a lead to a main electrode 5 whilst the inner end 10<1> of the strip 10 constitutes an auxiliary electrode to which current is fed through the remainder of the strip.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP75723D DE677916C (en) | 1937-08-15 | 1937-08-15 | Electric high pressure vapor discharge lamp with quartz vessel and auxiliary electrodes that facilitate ignition |
GB21263/38A GB510828A (en) | 1937-08-15 | 1938-07-18 | Improvements in electric discharge devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB499897A true GB499897A (en) | 1939-01-31 |
Family
ID=25990990
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23431/37A Expired GB499897A (en) | 1937-08-15 | 1937-08-26 | Improvements in auxiliary electrodes in electric discharge devices |
GB21263/38A Expired GB510828A (en) | 1937-08-15 | 1938-07-18 | Improvements in electric discharge devices |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21263/38A Expired GB510828A (en) | 1937-08-15 | 1938-07-18 | Improvements in electric discharge devices |
Country Status (4)
Country | Link |
---|---|
US (1) | US2200939A (en) |
DE (5) | DE677916C (en) |
FR (1) | FR842065A (en) |
GB (2) | GB499897A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2232812A (en) * | 1989-03-14 | 1990-12-19 | Narva Veb | Leads for a discharge lamp |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2438562A (en) * | 1942-03-13 | 1948-03-30 | Gen Electric | Seal for electric discharge devices and method of manufacture |
US2659183A (en) * | 1950-11-13 | 1953-11-17 | Hanovia Chemical & Mfg Co | Electrical conductor for discharge devices |
US2706366A (en) * | 1950-11-25 | 1955-04-19 | Bell Telephone Labor Inc | Method of constructing a helix assembly |
US2805134A (en) * | 1954-12-15 | 1957-09-03 | Mine Safety Appliances Co | Combustible gas indicator and filament therefor |
US2781470A (en) * | 1955-10-21 | 1957-02-12 | Bellott Emile Melvin | Electrical connection means |
US3581133A (en) * | 1968-12-23 | 1971-05-25 | Ushio Electric Inc | Gaseous discharge tube with metallically coated, electrode support portions |
FR2231107A1 (en) * | 1973-05-25 | 1974-12-20 | Central Eclairage Lab | Sodium vapour high-pressure discharge lamp - having internal auxiliary electrode for short ignition discharge path |
US4340264A (en) * | 1979-07-05 | 1982-07-20 | The Perkin-Elmer Corporation | Manufacture of glass base lamp |
US6744206B2 (en) * | 2002-02-25 | 2004-06-01 | Matsushita Electric Industrial Co., Ltd. | Metal halide lamp with reduced change in color temperature |
KR101008530B1 (en) * | 2002-11-25 | 2011-01-14 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Discharge vessel, gas-tight high-pressure burner, lamp comprising said burner and method of manufacturing said burner |
KR101078446B1 (en) * | 2006-12-07 | 2011-10-31 | 오스람 아게 | Discharge lamp and method for producing a bulb neck for a discharge lamp |
-
1937
- 1937-08-15 DE DEP75723D patent/DE677916C/en not_active Expired
- 1937-08-26 GB GB23431/37A patent/GB499897A/en not_active Expired
- 1937-11-04 DE DEP76190D patent/DE680475C/en not_active Expired
- 1937-11-04 DE DEP76189D patent/DE684893C/en not_active Expired
-
1938
- 1938-02-11 DE DEP76750D patent/DE684894C/en not_active Expired
- 1938-07-05 DE DEP77564D patent/DE686048C/en not_active Expired
- 1938-07-18 GB GB21263/38A patent/GB510828A/en not_active Expired
- 1938-08-12 US US224614A patent/US2200939A/en not_active Expired - Lifetime
- 1938-08-13 FR FR842065D patent/FR842065A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2232812A (en) * | 1989-03-14 | 1990-12-19 | Narva Veb | Leads for a discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
US2200939A (en) | 1940-05-14 |
GB510828A (en) | 1939-08-09 |
DE684894C (en) | 1939-12-07 |
DE680475C (en) | 1939-08-30 |
DE686048C (en) | 1939-12-30 |
DE677916C (en) | 1939-07-05 |
FR842065A (en) | 1939-06-05 |
DE684893C (en) | 1939-12-07 |
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