US5117150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference filter for deuterium lamp for spectral analyzers
Assignee: Balzers und Leybold Deutschland Holding AG
•
Filing: 1990-01-20
•
Granted: 1992-05-26
•
Expires: 2010-01-20
Abstract
Abstract PCT No. PCT/EP90/00114 Sec. 371 Date Sep. 10, 1990 Sec. 102(e) Date Sep. 10, 1990 PCT Filed Jan. 20, 1990 PCT Pub. No. WO90/09032 PCT Pub. Date Aug. 9, 1990.A deuterium lamp with a quartz glass bulb for spectral analyzers is disclosed. At least the portion of the quartz glass bulb through which the radiation produced passes is provided on its outer surface with a multiple interference filter layer; the physical layer thickness of each layer is in the range from 10 to 70 nm. The multiple layer comprises atlternating aluminum oxide and silicon dioxide, or magnesium fluoride. The interference filter layers are preferably vapor-deposited in a vacuum.
Inventors
- 👤 Werner Schwarz
- 👤 Horst Kremmling
- 👤 Gunter Thomas
- 👤 Hans-Georg Lotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:20
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A deuterium lamp with a quartz discharge bulb for spectral analyzers, in particular spectral photometers, in which the radiation produced passes through a portion of the bulb, characterized in that at least that portion of the bulb through which said radiation passes has, on its outer surface, a multiple interference filter layer of alternating aluminum oxide and either silicon dioxide or magnesium fluoride, wherein the physical layer thickness of each layer is in the range from 10 to 70 nms and the first effective layer of the interference filter, facing the bulb surface, comprises aluminum oxide, and the multiple interference filter layer has an absorption edge at a wavelength from approximately 190 to 200 nm, but has maximally high transmission for wavelengths greater than 200 nm.
Claim 2
Dependent Claim
126 words
A deuterium lamp with a quartz discharge bulb for spectral analyzers, in particular spectral photometers, in which the radiation produced passes through a portion of the bulb, characterized in that at least that portion of the bulb through which said radiation passes has, on its outer surface, a multiple interference filter layer of alternating aluminum oxide and either silicon dioxide or magnesium fluoride, wherein the physical layer thickness of each layer is in the range from 10 to 70 nms and the first effective layer of the interference filter, facing the bulb surface, comprises aluminum oxide, and the multiple interference filter layer has an absorption edge at a wavelength from approximately 190 to 200 nm, but has maximally high transmission for wavelengths greater than 200 nm.
Claim 3
Dependent Claim
41 words
The deuterium lamp of claim 1, characterized in that the multiple interference filter layer comprises at least 10 pairs of layers, wherein one pair of layers comprises one aluminum oxide layer and one layer comprises either silicon dioxide or magnesium fluoride.
Claim 4
Dependent Claim
43 words
The deuterium lamp of claim 1, characterized in that the case where the interference filter layer combination is aluminum oxide and silicon dioxide, the uppermost layer of the interference filter, facing away from the surface of the quartz glass bulb, comprises silicon dioxide.
Claim 5
Dependent Claim
43 words
The deuterium lamp of claim 1, characterized in that the case where the interference filter layer combination is aluminum oxide and magnesium fluoride, the uppermost layer of the interference filter, facing away from the surface of the quartz glass bulb, comprises aluminum oxide.
Claim 6
Dependent Claim
21 words
The deuterium lamp of claim 1, characterized in that the interference filter layers are layers that are vapor-deposited i a vacuum.
Claim 7
Dependent Claim
29 words
The deuterium lamp of claim 1, characterized in that the thickness of each layer of the interference filter is lambda/4, where lambda equals limit wavelength of the absorption edge.
References Cited (Backward Citations)
FR1353566A
Cited
DE1589095A1
Cited
US3914023A
Cited
US3931536A
Cited
DE2530195A1
Cited
US4049987A
Cited
US4320936A
Cited
NL8502966A
Cited
US4910431A
Cited
US4880988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |