US4937496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xenon short arc discharge lamp
Assignee: WC HERAEUS A OF FED REP OF GERMAN GmbH LLC
•
Filing: 1988-05-05
•
Granted: 1990-06-26
•
Expires: 2008-05-05
Abstract
Abstract A xenon short arc discharge lamp has a lamp bulb (1) of quartz glass, into which two rod-shaped electrodes (4, 5) protrude, the spacing of which is shorter than the diameter of the shaft (8) of the cathode (5); the cathode (5) is provided with a conical, obtuse tip (9). By doping with a metal halide, such as thallium iodide, the spectral radiant intensity per unit area in the plasma zone immediately in front of the cathode (5) is increased substantially compared with an undoped xenon short arc discharge lamp, and as a result of a flow-controlled tungsten-halogen cycle process, a stabilized cathode spot operation is attained, and the inner wall of the lamp bulb (1) remains free of tungsten deposits.
Inventors
- 👤 Manfred Neiger
- 👤 Reiner Hoppstock
- 👤 Bernd Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/70; G03F7/70008; G03F7/70016; H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/125; H01J61/84; H01J61/86
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
153 words
A xenon short arc discharge lamp comprising a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass, two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5), a xenon filling in said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output, said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source, wherein the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
Claim 2
Dependent Claim
153 words
A xenon short arc discharge lamp comprising a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass, two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5), a xenon filling in said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output, said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source, wherein the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
Claim 3
Dependent Claim
19 words
A lamp as defined by claim 1, characterized in that the lamp bulb (1) is completely of quartz glass.
Claim 4
Dependent Claim
31 words
A lamp as defined by claim 1 or 2, characterized in that the spacing between the electrodes (4, 5) is selected as a function of the power consumption of the lamp.
Claim 5
Dependent Claim
37 words
A lamp as defined by claim 3, characterized in that it is adapted for a power consumption of up to 20 KW, the spacing (10) between the electrodes being in the range from 0.2 to 5 mm.
Claim 6
Dependent Claim
16 words
A lamp as defined by claim 1, characterized in that the doping substance is thallium iodide.
Claim 7
Dependent Claim
16 words
A lamp as defined by claim 1, characterized in that the doping substance is indium iodide.
Claim 8
Dependent Claim
16 words
A lamp as defined by claim 1, characterized in that the doping substance is gallium iodide.
Claim 9
Dependent Claim
16 words
A lamp as defined by claim 1, characterized in that the doping substance is potassium iodide.
Claim 10
Dependent Claim
24 words
A lamp as defined by claim 1, characterized in that the doping substance is an iodide of the group IIb of the periodic table.
Claim 11
Dependent Claim
16 words
A lamp as defined by claim 9, characterized in that the doping substance is mercury iodide.
Claim 12
Dependent Claim
41 words
A xenon short arc discharge lamp according to claim 1, wherein said metal halide consists essentially of thallium oxide, and radiant intensity per unit area, in a spectral range between 500 nm and 550 nm, continuously exceeds 4 watts/sr·nm·cm 2 .
Claim 13
Dependent Claim
47 words
A xenon short arc discharge lamp according to claim 2, wherein the doping substance is an iodide of group IIb of the periodic table, and wherein radiant intensity per unit area, in a spectral range between 500 nm and 550 nm, continuously exceeds 4 watts/sr·nm·cm 2 .
Claim 14
Dependent Claim
47 words
A xenon short arc discharge lamp according to claim 3, wherein the doping substance is an iodide of group IIb of the periodic table, and wherein radiant intensity per unit area, in a spectral range between 500 nm and 550 nm, continuously exceeds 4 watts/sr·nm·cm 2 .
Claim 15
Dependent Claim
47 words
A xenon short arc discharge lamp according to claim 4, wherein the doping substance is an iodide of group IIb of the periodic table, and wherein radiant intensity per unit area, in a spectral range between 500 nm and 550 nm, continuously exceeds 4 watts/sr·nm·cm 2 .
Claim 16
Dependent Claim
154 words
A xenon short arc continuous-wave-laser-pumping light source comprising a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass, two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5), a xenon filling inn said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output, said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source, wherein the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
Claim 17
Dependent Claim
154 words
A xenon short arc continuous-wave-laser-pumping light source comprising a high-pressure-proof bulb (1), which, at least in a transparent zone thereof, comprises quartz glass, two opposed rod-shaped electrodes (4, 5) located on a common axis (3) protruding into the bulb, of which the anode (4) has a larger diameter than the cathode (5), a xenon filling inn said bulb, at a pressure of at least one atmosphere or bar in the non-operating state, thereby providing rapid approximation of maximum final light output, said electrodes (4, 5) being spaced from one another by a distance which is shorter than the diameter of the shaft (8) of the cathode (5), thereby approximating a punctiform light source, wherein the tip of the cathode (5) is at least partially conical, thereby minimizing tip melting and disintegration, and the lamp includes at least one metal halide as a doping substance, thereby constricting arc size and increasing continuum emission radiant intensity.
Claim 18
Dependent Claim
39 words
A laser light source according to claim 1, wherein said metal halide consists essentially of thallium oxide, and radiant intensity per unit area, in a spectral range between 500 nm and 550 nm, continuously exceeds 4 watts/sr·nm·cm 2 .
References Cited (Backward Citations)
US1334150A
Cited
CH297983A
Cited
US3259777A
Cited
DE1814095A1
Cited
US3714493A
Cited
US3706000A
Cited
US3902090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |