GB995419A - An electric discharge lamp - Google Patents
An electric discharge lampInfo
- Publication number
- GB995419A GB995419A GB27094/61A GB2709461A GB995419A GB 995419 A GB995419 A GB 995419A GB 27094/61 A GB27094/61 A GB 27094/61A GB 2709461 A GB2709461 A GB 2709461A GB 995419 A GB995419 A GB 995419A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- discharge
- cathode
- envelope
- basic discharge
- 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
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
Landscapes
- Discharge Lamp (AREA)
Abstract
995,419. Discharge lamps; electrode materials. PATENT-TREUHAND-GESELLSCHAFT FUR ELEKTRISCHE GLUHLAMPEN. July 26, 1961 [July 27, 1960], No. 27094/61. Heading H1D. An electric discharge lamp filled with metal vapour and/or rare gas and operating at a loading of more than 10<SP>4</SP>W/cm.<SP>3</SP> and at a pressure of more than one atmosphere comprises a cathode 2 and anode 3 connected to a D.C. supply to set up a basic discharge and a third electrode 4 arranged laterally of the line between the electrodes 2 and 3 and nearer to the cathode 2 and connected as an additional cathode in a circuit supplying a continuous or pulsating D.C., the electrode 4 being so dimensioned and positioned in relation to the basic discharge and the current which it carries during operation being so chosen that a discharge without cathode spot originates on it. The envelope can be of quartz glass, glass, aluminium oxide or of metal with windows. The metal envelope can form one of the electrodes, e.g. the anode. The basic discharge can be operated with relatively low power consumption and the current supplied to the third electrode can have a much higher value than that of the basic discharge. The third electrode can be in the form of a ring 7, Fig. 2, surrounding the arc of the basic discharge and in a plane at right angles to the direction of the basic discharge. The anode can be an annular electrode and can have an insulating layer on the side facing the cathode. A material which reduces the work function of the electrons and facilitates the formation of a discharge without cathode spot can be added to the material of the third electrode. The third electrode can consist of tungsten with an addition of thorium oxide or lanthanum boride, or can consist wholly or partly of thoriated tungsten, tantalum or hafnium. The third electrode can be provided with a groove facing the basic discharge which groove is filled with an activating material. The filling of the lamp can contain a material, e.g. a halogen or a halogen compound, which forms with the material of the third electrode, e.g. tungsten, a compound having a higher vapour pressure than the electrode material at the temperature prevailing in the lamp and dissociating at the high temperatures in the arc starting at the third electrode-this purifies the envelope. Magnetic displacement of the discharge can be prevented by effecting the current supply to the ring-shaped electrode 7, Fig. 2, at two oppositely arranged supply points or at several supply points arranged symmetrically, or by arranging that the conductor for the current supply to the third electrode forms outside the envelope one or several turns which lie substantially in the plane defined by the axis of the basic discharge and the direction of the current inlead to the third electrode within the envelope. The filling can be xenon or krypton at an operating pressure of 1-50 atmospheres.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP25430A DE1139208B (en) | 1960-07-27 | 1960-07-27 | High-luminance high pressure discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
GB995419A true GB995419A (en) | 1965-06-16 |
Family
ID=7370083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27094/61A Expired GB995419A (en) | 1960-07-27 | 1961-07-26 | An electric discharge lamp |
Country Status (3)
Country | Link |
---|---|
US (1) | US3218510A (en) |
DE (1) | DE1139208B (en) |
GB (1) | GB995419A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3319114A (en) * | 1964-01-09 | 1967-05-09 | Westinghouse Electric Corp | Electromagnetic switching device having a discharge gap formed by two spaced coaxial lines extending into a gas-filled waveguide |
AR207269A1 (en) * | 1975-03-20 | 1976-09-22 | Dentsply Int Inc | LIGHT SOURCE APPARATUS TO SUPPLY ULTRAVIOLET RADIATION TO A RESTRICTED SURFACE AREA |
US4229658A (en) * | 1978-08-18 | 1980-10-21 | Dentsply Research & Development Corp. | Xenon light apparatus for supplying ultraviolet and visible spectra |
ITMI20012389A1 (en) * | 2001-11-12 | 2003-05-12 | Getters Spa | CABLE CATHODE WITH INTEGRATED GETTER FOR DISCHARGE LAMPS AND METHODS FOR ITS REALIZATION |
US7564192B2 (en) * | 2005-10-24 | 2009-07-21 | General Electric Company | HID dimming method and apparatus |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE695667C (en) * | 1936-06-28 | 1940-08-30 | Osram G M B H Komm Ges | Lighting device for cinema, television and advertising purposes |
NL52742C (en) * | 1937-08-05 | |||
US2567491A (en) * | 1943-12-29 | 1951-09-11 | Mitchell John Wesley | Luminous discharge tube |
DE906243C (en) * | 1949-07-19 | 1954-03-11 | Dr Hermann E Krefft | Electric metal vapor and noble gas high pressure discharge lamps equipped with fixed glow electrodes and procedures for their operation |
US2697183A (en) * | 1950-10-16 | 1954-12-14 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | High-pressure electric discharge lamp |
US2728871A (en) * | 1954-06-09 | 1955-12-27 | Sylvania Electric Prod | Electric discharge lamp |
US2930920A (en) * | 1956-11-02 | 1960-03-29 | Engelhard Ind Inc | Electrical discharge lamp |
-
1960
- 1960-07-27 DE DEP25430A patent/DE1139208B/en active Pending
-
1961
- 1961-07-21 US US125711A patent/US3218510A/en not_active Expired - Lifetime
- 1961-07-26 GB GB27094/61A patent/GB995419A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1139208B (en) | 1962-11-08 |
US3218510A (en) | 1965-11-16 |
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