Patent US3897594A successfully refreshed from Google Patents.
US3897594A
Expired / Lapsed
US
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High pressure mercury discharge lamp
Assignee: Osram GmbH
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Filing: 1974-03-19
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Granted: 1975-07-29
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Expires: 1994-03-19
Abstract
Abstract A high pressure discharge lamp containing metal halides in the fill and having a power input of more than 1,000 W is dimensioned such that the ratio of electrode spacing to inner diameter of the envelope is between 0.05 and 1 per kW of power input, and the ratio of power input in watts to volume in cubic centimeters is between 10 and 100. The lamp is operated with a current intensity of at least 25 amperes and preferably has a high-current seal, the main constituent thereof being a cup of molybdenum with its bottom closing off the discharge space. Intense molecular radiation is emitted from a broad annular zone surrounding the discharge core and occupies at least 80% of the lamp diameter.
Inventors
- 👤 Hanns-Peter Popp
- 👤 Horst Grabner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/82; H01J61/827
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
An improved high pressure mercury discharge lamp having a power input in excess of 1,000 watts comprising spaced apart electrodes in a bulb of transparent material having high heat capacity and containing metal halides, the improvement comprising the combination wherein the ratio of electrode spacing to inner diameter of the bulb is between 0.05 and 1 per kilowatt of power input to the lamp, and the ratio of power input in watts to volume of the discharge arc in cubic centimeters is from 10 to 100.
Claim 2
Dependent Claim
86 words
An improved high pressure mercury discharge lamp having a power input in excess of 1,000 watts comprising spaced apart electrodes in a bulb of transparent material having high heat capacity and containing metal halides, the improvement comprising the combination wherein the ratio of electrode spacing to inner diameter of the bulb is between 0.05 and 1 per kilowatt of power input to the lamp, and the ratio of power input in watts to volume of the discharge arc in cubic centimeters is from 10 to 100.
Claim 3
Dependent Claim
47 words
The lamp of claim 1, wherein said ratio of electrode spacing to inner diameter is from 0.1 to 0.5 per kilowatt of power input, and the said ratio of power input in watts to volume of the discharge arc in cubic centimeters if from 20 to 50.
Claim 4
Dependent Claim
27 words
The lamp of claim 1, wherein the width of the luminous portion of the discharge arc is at least 80% of the diameter of the said bulb.
Claim 5
Dependent Claim
27 words
The lamp of claim 1, wherein the width of the luminous portion of the discharge arc is at least 90% of the diameter of the said bulb.
Claim 6
Dependent Claim
21 words
The lamp of claim 1, wherein the said lamp is adapted to a current intensity input of at least 25 amperes.
Claim 7
Dependent Claim
21 words
The lamp of claim 3, wherein the said lamp is adapted to a current intensity input of at least 25 amperes.
Claim 8
Dependent Claim
131 words
The lamp of claim 1 having at each end a high-current seal hermetically sealed to said bulb, said seal comprising a cup-shaped refractory metal with the cup bottom facing the interior of said bulb and having cup walls which taper in the direction away from the cup bottom and are hermetically sealed to said bulb, and having a lead-in rod of refractory material hermetically passed through the bottom of said cup, said lead-in rod having an electrode attached at its inner end thereof and being provided with annular grooves for heat accumulation directly in front of said cup bottom in the interior direction of said bulb and having a supporting disk positioned behind said cup bottom, and said bulb material abutting the surface of said disk and said tapered cup walls.
Claim 9
Dependent Claim
130 words
The lamp of claim 6 having at each end a high-current seal hermetically sealed to said bulb, said seal comprising a cup-shaped molybdenum with the cup bottom facing the interior of said bulb and having cup walls which taper in the direction away from the cup bottom and are hermetically sealed to said bulb, and having a lead-in rod of refractory material hermetically passed through the bottom of said cup, said lead-in rod having an electrode attached at its inner end thereof and being provided with annular grooves for heat accumulation directly in front of said cup bottom in the interior direction of said bulb and having a supporting disk positioned behind said cup bottom, and said bulb material abutting the surface of said disk and said tapered cup walls.
Claim 10
Dependent Claim
16 words
The lamp of claim 8, wherein said bulb is enclosed in an outer envelope or jacket.
Claim 11
Dependent Claim
16 words
The lamp of claim 1, wherein said bulb is enclosed in an outer envelope or jacket.
References Cited (Backward Citations)
US2650322A
Cited
US2714686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |