US3898504A
Expired / Lapsed
US
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High pressure metal vapor discharge lamp
Assignee: Panasonic Holdings Corp
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Filing: 1973-11-15
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Granted: 1975-08-05
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Expires: 1993-11-15
Abstract
Abstract An electric discharge lamp having an excellent color rendition with a color acceptability higher than 1.0, a relatively high luminous efficacy and a good life performance, is provided, in a high pressure metal vapor lamp using a polycrystalline alumina ceramic tubing as the arc tube envelope within which sodium as a metal for producing radiant emission, mercury or cadmium as a buffer gas and xenon as a starting inert gas are contained, by controlling such quantities which are variable in the design of the high pressure metal vapor discharge lamp as the lamp wattage W in watts, an increased internal diameter of the arc tube envelope of the lamp d in millimeters, the interelectrode gap length L in millimeters and a lowered average potential gradient of the arc tube E in volts per centimeter in such a manner that they may satisfy the relations:
Inventors
- 👤 Hidezoh Akutsu
- 👤 Haruo Yamazaki
- 👤 Takio Okamoto
- 👤 Yoshiaki Watarai
- 👤 Shoichi Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:19
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/82; H01J61/825; H01J61/02; H01J61/12; H01J61/18; H01J61/22; H01J61/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A HIGH PRESSURE SODIUM VAPOR DISCHARGE LAMP COMPRISING A TUBE ENVELOPE CONTAINING THEREIN SODIUM, INERT STATING GAS, BUFFER GAS COMPRISING AT LEAST ONE OF MERCURY AND CADMIUM AND DISCHARGE ELECTRODES SEALED IN SAID ENVELOPE, SAID LAMP SATISFYING THE FOLLOWING RELATION BETWEEN THE TUBE DIAMETER D IN MILLIMETERS AND AN AVERAGE POTENTIAL GRADIENT E IN VOLTS PER CENTIMETER
Claim 2
Dependent Claim
57 words
A HIGH PRESSURE SODIUM VAPOR DISCHARGE LAMP COMPRISING A TUBE ENVELOPE CONTAINING THEREIN SODIUM, INERT STATING GAS, BUFFER GAS COMPRISING AT LEAST ONE OF MERCURY AND CADMIUM AND DISCHARGE ELECTRODES SEALED IN SAID ENVELOPE, SAID LAMP SATISFYING THE FOLLOWING RELATION BETWEEN THE TUBE DIAMETER D IN MILLIMETERS AND AN AVERAGE POTENTIAL GRADIENT E IN VOLTS PER CENTIMETER
Claim 3
Dependent Claim
110 words
A high pressure metal vapor discharge lamp using a translucent polycrystalline alumina ceramic tubing as the lamp envelope within which are contained sodium as metal for producing radiant emission, at least one of mercury and cadmium as a source of buffer gas, xenon as an inert starting gas and discharge electrodes sealed in said envelope, wherein the operating voltage E of the lamp is lower than such a critical value VLO in volts of the lamp voltage that an economical ballast can be designed, and the lamp wattage W in watts, the lamp diameter d in millimeters and the interelectrode gap length L in millimeters simultaneously satisfy the following conditions:
Claim 4
Dependent Claim
110 words
A high pressure metal vapor discharge lamp using a translucent polycrystalline alumina ceramic tubing as the lamp envelope within which are contained sodium as metal for producing radiant emission, at least one of mercury and cadmium as a source of buffer gas, xenon as an inert starting gas and discharge electrodes sealed in said envelope, wherein the operating voltage E of the lamp is lower than such a critical value VLO in volts of the lamp voltage that an economical ballast can be designed, and the lamp wattage W in watts, the lamp diameter d in millimeters and the interelectrode gap length L in millimeters simultaneously satisfy the following conditions:
Claim 5
Dependent Claim
20 words
A high pressure metal vapor discharge lamp as claimed in claim 2, wherein said critical value VLO is 130 volts.
Claim 6
Dependent Claim
33 words
A high pressure metal vapor discharge lamp as claimed in claim 3, wherein said critical value VLO is 0.6 Vs, where Vs is a voltage value in volts of the power supply line.
Claim 7
Dependent Claim
20 words
A high pressure metal vapor discharge lamp as claimed in claim 3, wherein said critical value VLO is 140 volts.
Claim 8
Dependent Claim
99 words
A high pressure metal vapor discharge lamp using a polycrystalline alumina ceramic tubing as the arc tube envelop within which are contained sodium metal for producing radiant emission, a buffer gas comprising at least one of mercury and cadmium, inert starting gas and discharge electrodes sealed in said envelope, wherein the lamp wattage W in watts, the lamp diameter d in millimeters, the interelectrode gap length L in millimeters and the average potential gradient E in volts per centimeter simultaneously satisfy the following conditions: E > or = 37.7 - 2.05d, wherein E < or = 25 and d>9,
Claim 9
Dependent Claim
99 words
A high pressure metal vapor discharge lamp using a polycrystalline alumina ceramic tubing as the arc tube envelop within which are contained sodium metal for producing radiant emission, a buffer gas comprising at least one of mercury and cadmium, inert starting gas and discharge electrodes sealed in said envelope, wherein the lamp wattage W in watts, the lamp diameter d in millimeters, the interelectrode gap length L in millimeters and the average potential gradient E in volts per centimeter simultaneously satisfy the following conditions: E > or = 37.7 - 2.05d, wherein E < or = 25 and d>9,
Claim 10
Dependent Claim
20 words
A high pressure metal vapor discharge lamp as claimed in claim 6, wherein said buffer gas consists essentially of cadmium.
Claim 11
Dependent Claim
20 words
A high pressure metal vapor discharge lamp as claimed in claim 6, wherein said buffer gas consists essentially of mercury.
Claim 12
Dependent Claim
26 words
A discharge lamp as claimed in claim 1, wherein the diameter d is given in a range 9 < or = d < or = 13.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |