US3731133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-intensity arc lamp
Assignee: Excelitas Technologies Illumination Inc
•
Filing: 1972-01-07
•
Granted: 1973-05-01
•
Expires: 1992-01-07
Abstract
Abstract A short arc gas discharge lamp includes a solid ceramic body provided with a reflector-shaped surface extending from one end face into the body. A thermally conductive tube inserted in an aperture extending through the other end face of the ceramic body supports an anode opposite to a cathode. The cathode is mounted adjacent to a window of the lamp and in predetermined relationship to the one end face of the body so that the point of highest intensity of a gas discharge within the lamp will be located at the focal point of the reflector surface. In one embodiment of the lamp, the reflector-shaped surface of the ceramic body is metallized to provide a reflective surface, whereas in a second embodiment the reflector-shaped surface is provided with a smooth glazed coating that is suitable for direct reception of a metallic reflective coating without the use of intermediate metallizing steps such as plating and polishing.
Inventors
- 👤 R Mcrae
- 👤 W Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/98
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
An arc lamp comprising an opaque dielectric member forming the sidewall and base end portion of said lamp, a transparent wall portion forming an optical window adjacent the end of said lamp opposite said base end, the window end of said opaque dielectric member having a concave surface on which a reflector is formed, an anode and a cathode electrode each having one end positioned within the space formed by said concave surface, said one end of said electrodes being spaced apart to form an arc gap, first metallic means sealing one of said electrodes and said window to said window end of said opaque dielectric member, said first metallic means forming an electrical lead for said one electrode, the base end of said opaque dielectric member having an aperture, and second metallic means sealing the other of said electrodes in said aperture and forming an electrical lead for said other electrode.
Claim 2
Dependent Claim
152 words
An arc lamp comprising an opaque dielectric member forming the sidewall and base end portion of said lamp, a transparent wall portion forming an optical window adjacent the end of said lamp opposite said base end, the window end of said opaque dielectric member having a concave surface on which a reflector is formed, an anode and a cathode electrode each having one end positioned within the space formed by said concave surface, said one end of said electrodes being spaced apart to form an arc gap, first metallic means sealing one of said electrodes and said window to said window end of said opaque dielectric member, said first metallic means forming an electrical lead for said one electrode, the base end of said opaque dielectric member having an aperture, and second metallic means sealing the other of said electrodes in said aperture and forming an electrical lead for said other electrode.
Claim 3
Dependent Claim
19 words
The arc lamp of claim 1 wherein said reflector is configured as a surface of revolution about an axis.
Claim 4
Dependent Claim
23 words
The arc lamp of claim 2 wherein said electrodes are elongate with the long axes thereof coinciding with the axis of the reflector.
Claim 5
Dependent Claim
13 words
The arc lamp of claim 1 wherein said opaque dielectric member is ceramiC.
Claim 6
Dependent Claim
14 words
The arc lamp of claim 4 wherein said ceramic member is made of alumina.
Claim 7
Dependent Claim
17 words
The arc lamp of claim 1 wherein said reflector comprises a polished portion of said concave surface.
Claim 8
Dependent Claim
17 words
The arc lamp of claim 1 wherein said reflector comprises a metallized portion of said concave surface.
Claim 9
Dependent Claim
17 words
The arc lamp of claim 1 wherein said reflector comprises a glazed coating on said concave surface.
Claim 10
Dependent Claim
19 words
The arc lamp of claim 8 wherein said glazed coating has a thickness of from two to six mils.
Claim 11
Dependent Claim
42 words
The arc lamp of claim 1 wherein said opaque dielectric member is cylindrical, said first metallic means comprises an annular structure disposed coaxially with and exteriorly of said opaque dielectric member, and said one electrode is mounted coaxially with said annular structure.
Claim 12
Dependent Claim
44 words
The arc lamp of claim 1 wherein said second metallic means comprises tubulation, a portion of said other electrode is disposed within the bore of said tubulation, and said tubulation is apertured to provide a path for evacuation of air therethrough from said envelope.
Claim 13
Dependent Claim
158 words
The arc lamp of claim 1 wherein said opaque dielectric member is cylindrical and said first metallic means comprises a first annular ring which abuts the window end of said opaque dielectric member and is coaxial therewith, said first annular ring having an outer diameter equal to the outer diameter of said opaque dielectric member, a second annular ring which has a generally L-shaped rim cross-section, one arm of said rim abutting said first annular ring, said first and second annular rings being sealingly joined together at said abutment, a third annular ring which abuts said second annular ring and is sealingly joined thereto, said third annular ring supporting and sealingly joined to said window, and a fourth annular ring which surrounds a portion of said opaque dielectric member adjacent the abutment of said opaque dielectric member with said first annular ring, said fourth annular ring substantially surrounding said first, second and third annular rings and said window.
Claim 14
Dependent Claim
51 words
The arc lamp of claim 1 wherein a metallic member is affixed to the exterior surface of the base end of said opaque dielectric member, said metallic member being in contact with said second metallic means to provide a thermally conductive path for the removal of heat from said other electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |