US4020377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure mercury vapor discharge lamp
Assignee: Osram GmbH
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Filing: 1976-04-08
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Granted: 1977-04-26
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Expires: 1996-04-08
Abstract
Abstract An improved high pressure mercury vapor discharge lamp having a high color temperature together with high luminous efficacy and a high color rendering. This is accomplished by including in the filling halides of at least one of the rare-earth metals dysprosium, holmium, thulium, erbium, and terbium; together with the halides of at least one of the alkali or alkaline earth metals; and including a filtering agent for radiation in the blue spectral region. The lamp is preferably of isothermal design. The electrodes preferably contain 1-3% of Dy2O3.
Inventors
- 👤 Hanns-Peter Popp
- 👤 Walter Pilz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:06
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
A high pressure mercury vapor discharge lamp comprising a light-transmissive discharge vessel; spaced electrodes sealed into the discharge vessel; a filling in said discharge vessel comprising mercury as the buffer gas, an inert ignition gas, at least one halide of at least one of the rare-earth metals selected from the group consisting of dysprosium, holmium, thulium, erbium, and terbium to effect excitation of molecular emission in the orange-red spectral region, and thallium halide together with at least one halide of at least one metal selected from the group consisting of alkali and alkaline-earth metals to increase the vapor pressure of said rare-earth metal halides; and a filtering agent acting as a filter in the blue spectral region, whereby when said lamp is discharged by passing a current through said electrodes, the lamp has a color temperature less than 4,500 K, a luminous efficacy of more than 70 lm/W, and a color rendering R a greater than 70.
Claim 2
Dependent Claim
157 words
A high pressure mercury vapor discharge lamp comprising a light-transmissive discharge vessel; spaced electrodes sealed into the discharge vessel; a filling in said discharge vessel comprising mercury as the buffer gas, an inert ignition gas, at least one halide of at least one of the rare-earth metals selected from the group consisting of dysprosium, holmium, thulium, erbium, and terbium to effect excitation of molecular emission in the orange-red spectral region, and thallium halide together with at least one halide of at least one metal selected from the group consisting of alkali and alkaline-earth metals to increase the vapor pressure of said rare-earth metal halides; and a filtering agent acting as a filter in the blue spectral region, whereby when said lamp is discharged by passing a current through said electrodes, the lamp has a color temperature less than 4,500 K, a luminous efficacy of more than 70 lm/W, and a color rendering R a greater than 70.
Claim 3
Dependent Claim
22 words
The lamp of claim 1 wherein said filtering agent is tin iodide which is included in the filling in the discharge vessel.
Claim 4
Dependent Claim
30 words
The lamp of claim 2 wherein said electrodes are refractory metal electrodes, and wherein said halides are at least one halide selected from the group consisting of iodine and bromine.
Claim 5
Dependent Claim
25 words
The lamp of claim 3 wherein said filling in the discharge vessel contains dysprosium, sodium, thallium, tin, iodine, bromine, mercury, and the inert ignition gas.
Claim 6
Dependent Claim
41 words
The lamp of claim 4 containing per cubic centimeter of volume of the discharge vessel, 10 mg Hg, 0.6 mg Dy, 0.4 mg NaI, 0.2 mg TlI, 0.7 mg Sn, 1 mg HgI 2 , and 0.9 mg Br 2 .
Claim 7
Dependent Claim
21 words
The lamp of claim 5 wherein the electrodes are tungsten electrodes containing between 1 and 3% by weight of dysprosium oxide.
Claim 8
Dependent Claim
23 words
The lamp of claim 1 wherein the electrodes stabilize the discharge arc which forms between the electrodes when the lamp is in operation.
Claim 9
Dependent Claim
22 words
The lamp of claim 7 wherein said electrodes comprise a refractory metal containing between 1 and 3% by weight of dysprosium oxide.
Claim 10
Dependent Claim
16 words
The lamp of claim 8 wherein said discharge vessel has isothermal characteristics with bell-shaped electrode spaces.
Claim 11
Dependent Claim
16 words
The lamp of claim 1 wherein said discharge vessel has isothermal characteristics with bell-shaped electrode spaces.
Claim 12
Dependent Claim
16 words
The lamp of claim 4 wherein said discharge vessel has isothermal characteristics with bell-shaped electrode spaces.
Claim 13
Dependent Claim
16 words
The lamp of claim 6 wherein said discharge vessel has isothermal characteristics with bell-shaped electrode spaces.
Claim 14
Dependent Claim
21 words
The vessel of claim 1 wherein said filtering agent is a coating applied to the light-transmissive material of the discharge vessel.
Claim 15
Dependent Claim
19 words
The lamp of claim 1 wherein said filtering agent is incorporated in the light-transmissive material comprising the discharge vessel.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |