US4179037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xenon arc lamp with compressive ceramic to metal seals
Assignee: Excelitas Technologies Illumination Inc
•
Filing: 1978-05-15
•
Granted: 1979-12-18
•
Expires: 1998-05-15
Abstract
Abstract A high pressure arc lamp envelope having an anode portion and cathode portion, separated by a ceramic insulator, is configured to prevent the high pressure from causing tensile stresses in the ceramic and its associated hermetic seals. The window seal is configured to reduce tensile stresses in the window and to place the metal-to-window bond of the seal in compression.
Inventors
- 👤 Edwin T. Chan
- 👤 Stanley R. Jepson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:08
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/84; H01J61/86; H01J61/02; H01J61/36; H01J61/98
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
159 words
An envelope for an arc lamp, said envelope being capable of containing a gas therewithin at a pressure higher than atmospheric pressure, said envelope comprising: a first metallic member having an inwardly projecting flange portion, a second metallic member having an outwardly projecting flange portion, the outwardly projecting flange portion of said second metallic member being received within said first metallic member, the inwardly projecting flange portion of said first metallic member being disposed to overlap the outwardly projecting flange portion of said second metallic member, said overlapping flange portions of said first and second metallic members being radially spaced apart to define a generally annular region between said first and second metallic members, a ceramic member disposed in said annular region, and means for hermetically sealing said ceramic member to said inwardly and outwardly projecting flange portions so that said ceramic member is under compression when said envelope contains a gas at a pressure higher than atmospheric pressure.
Claim 2
Dependent Claim
159 words
An envelope for an arc lamp, said envelope being capable of containing a gas therewithin at a pressure higher than atmospheric pressure, said envelope comprising: a first metallic member having an inwardly projecting flange portion, a second metallic member having an outwardly projecting flange portion, the outwardly projecting flange portion of said second metallic member being received within said first metallic member, the inwardly projecting flange portion of said first metallic member being disposed to overlap the outwardly projecting flange portion of said second metallic member, said overlapping flange portions of said first and second metallic members being radially spaced apart to define a generally annular region between said first and second metallic members, a ceramic member disposed in said annular region, and means for hermetically sealing said ceramic member to said inwardly and outwardly projecting flange portions so that said ceramic member is under compression when said envelope contains a gas at a pressure higher than atmospheric pressure.
Claim 3
Dependent Claim
61 words
The arc lamp envelope of claim 1 wherein said sealing means comprises a first seal interposed between a first surface portion of said ceramic member and the outwardly projecting flange portion of said second metallic member, and a second seal interposed between a second surface portion of said ceramic member and the inwardly projecting flange portion of said first metallic member.
Claim 4
Dependent Claim
39 words
The arc lamp envelope of claim 2 wherein said first and second surface portions of said ceramic member are planar, and wherein each of said first and second seals comprises a metallic alloy member formed to a knife-edge seal.
Claim 5
Dependent Claim
41 words
The arc lamp envelope of claim 3 wherein said planar surface portions of said ceramic member are metallized, and wherein said first and second knife-edge seals are brazed, respectively, to said first and second metallized surface portions of said ceramic member.
Claim 6
Dependent Claim
28 words
The arc lamp envelope of claim 4 wherein said first and second knife-edge seals are brazed, respectively, to the flanged portions of said second and first metallic members.
Claim 7
Dependent Claim
32 words
The arc lamp envelope of claim 2 wherein said ceramic member is of annular configuration surrounding a nonflanged portion of said second metallic member and is contained within said first metallic member.
Claim 8
Dependent Claim
22 words
The arc lamp envelope of claim 6 wherein said annular ceramic member is spaced apart from said first and second metallic members.
Claim 9
Dependent Claim
70 words
The arc lamp envelope of claim 6 wherein a first surface portion and a second surface portion of said annular ceramic member are planar, said planar surface portions being metallized, and wherein each of said first and second seals comprises a metallic alloy member formed to a knife-edge seal, said first and second knife-edge seals being brazed, respectively, to said first and second metallized surface portions of said ceramic member.
Claim 10
Dependent Claim
28 words
The arc lamp envelope of claim 8 wherein said first and second knife-edge seals are brazed, respectively, to the flanged portions of said second and first metallic members.
Claim 11
Dependent Claim
124 words
In an arc lamp comprising a metallic envelope member and a window, an outer surface of said window being a portion of the exterior of an enclosure for containing a gas at higher than atmospheric pressure, sealing means for providing a hermetic seal between said metallic envelope member and said window, said sealing means comprising: a knife-edge member disposed between said metallic envelope member and said window, said knife-edge member being in contact with said window only where a first edge of said knife-edge member abuts a peripheral portion of the outer surface of said window, said window being spaced apart from said metallic envelope member, a second edge of said knife-edge member abutting an inwardly projecting flange portion of said metallic envelope member.
Claim 12
Dependent Claim
124 words
In an arc lamp comprising a metallic envelope member and a window, an outer surface of said window being a portion of the exterior of an enclosure for containing a gas at higher than atmospheric pressure, sealing means for providing a hermetic seal between said metallic envelope member and said window, said sealing means comprising: a knife-edge member disposed between said metallic envelope member and said window, said knife-edge member being in contact with said window only where a first edge of said knife-edge member abuts a peripheral portion of the outer surface of said window, said window being spaced apart from said metallic envelope member, a second edge of said knife-edge member abutting an inwardly projecting flange portion of said metallic envelope member.
Claim 13
Dependent Claim
31 words
The sealing means of claim 10 wherein said peripheral portion of the outer edge of said window is metallized, and wherein said first edge of said knife-edge member is brazed thereto.
Claim 14
Dependent Claim
27 words
The sealing means of claim 10 wherein said second edge of said knife-edge member is brazed to said inwardly projecting flange portion of said metallic envelope member.
Claim 15
Dependent Claim
25 words
The sealing means of claim 11 wherein the outer surface of said window is generally circular, and wherein said knife-edge member is of annular configuration.
Claim 16
Dependent Claim
15 words
The sealing means of claim 11 wherein said knife-edge member is made of Kovar alloy.
References Cited (Backward Citations)
US2513920A
Cited
US2677781A
Cited
US3458744A
Cited
US3551719A
Cited
US3808496A
Cited
US3715613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |