US3858082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warm white lamp with normal output and improved color rendition
Assignee: Philips North America LLC
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Filing: 1972-08-10
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Granted: 1974-12-31
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Expires: 1992-08-10
Abstract
Abstract A lamp to generate three narrow band emissions which together provide white light with both high color rendition and high efficiency. The lamp uses a substantially homogeneous mixture of phosphors in which 3-40 percent by weight is a blue-emitting phosphor, 20-50 percent by weight is a green-emitting phosphor and 10-70 percent by weight is a red-emitting phosphor and in which the blue-emitting phosphor is at least one of strontium chloroapatite activated by divalent europium, alumino silicate activated with divalent europium, and calcium-barium-magnesium silicate activated with divalent europium, the green-emitting phosphor is at least one of zinc silicate activated with manganese, zinc germanate activated with manganese, zinc silico germanate activated with manganese, yttrium silicate activated with terbium, and zinc borate activated with terbium, and the red-emitting phosphor is at least one of yttrium oxide activated with trivalent europium, lithium indate activated with trivalent europium, yttrium vanadate activated with trivalent europium, and yttrium phosphate vanadate activated with trivalent europium. Preferably, the blue-emitting phosphor is strontium chloroapatite activated by divalent europium, the green-emitting phosphor is zinc silicate activated with manganese, and the red-emitting phosphor is yttrium oxide activated with trivalent europium.
Inventors
- 👤 W Thornton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A LUMINESCENT DISCHARGE LAMP WHICH WILL EFFICIENTLY GENERATE WHITE LIGHT OF A QUANTITY WHICH WILL PROVIDE ILLUMINATED OBJECTS WITH A COLOR APPEARANCE REASONABLY REPRESENTATIVE OF THE COLOR APPEARANCE OF SAID OBJECTS UNDER NATURAL LIGHT, SAID LAMP COMPRISING: A. A LIGHT GENERATING MEDIUM WHICH IS A SUBSTANTIALLY HOMOGENOUS MIXTURE OF PHOSPHORS, SAID MIXTURE BY CONSTITUENT WEIGHT PERCENT SUBSTANTIALLY COMPRISING: I. 3-40 PERCENT OF A BLUE-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF STRONTIUM CHLOROAPATITE ACTIVATED BY DIVALENT EUROPIUM, ALUMINO SILICATE ACTIVATED WITH DIVALENT EUROPIUM, AND CALCIUM-BARIUMMAGNESIUM SILICATE ACTIVATED WITH DIVALENT EUROPIUM; II. 20-50 PERCENT OF A GREEN-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF ZINC SILICATE ACTIVATED WITH MANGANESE, ZINC GERMANATE ACTIVATED WITH MANGANESE, ZINC SILICOGERMANATE ACTIVATED WITH MANGANESE, YTTRIUM SILICATE ACTIVATED WITH TERBIUM AND ZINC BORATE ACTIVATED WITH TERBIUM; AND III. 10-70 PERCENT OF A RED-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF YTTRIUM OXIDE ACTIVATED WITH TRIVALENT EUROPIUM, LITHIUM INDATE ACTIVATED WITH TRIVALENT EUROPIUM, YTTRIUM VANADATE ACTIVATED WITH TRIVALENT EUROPIUM, AND YTTRIUM PHOSPHATE VANADATE ACTIVATED WITH TRIVALENT EUROPIUM; AND B. MEANS FOR ENERGIZING SAID MIXTURE OF PHOSPHORS TO A VISIBLE-LIGHT-GENERATING CONDITION.
Claim 2
Dependent Claim
185 words
A LUMINESCENT DISCHARGE LAMP WHICH WILL EFFICIENTLY GENERATE WHITE LIGHT OF A QUANTITY WHICH WILL PROVIDE ILLUMINATED OBJECTS WITH A COLOR APPEARANCE REASONABLY REPRESENTATIVE OF THE COLOR APPEARANCE OF SAID OBJECTS UNDER NATURAL LIGHT, SAID LAMP COMPRISING: A. A LIGHT GENERATING MEDIUM WHICH IS A SUBSTANTIALLY HOMOGENOUS MIXTURE OF PHOSPHORS, SAID MIXTURE BY CONSTITUENT WEIGHT PERCENT SUBSTANTIALLY COMPRISING: I. 3-40 PERCENT OF A BLUE-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF STRONTIUM CHLOROAPATITE ACTIVATED BY DIVALENT EUROPIUM, ALUMINO SILICATE ACTIVATED WITH DIVALENT EUROPIUM, AND CALCIUM-BARIUMMAGNESIUM SILICATE ACTIVATED WITH DIVALENT EUROPIUM; II. 20-50 PERCENT OF A GREEN-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF ZINC SILICATE ACTIVATED WITH MANGANESE, ZINC GERMANATE ACTIVATED WITH MANGANESE, ZINC SILICOGERMANATE ACTIVATED WITH MANGANESE, YTTRIUM SILICATE ACTIVATED WITH TERBIUM AND ZINC BORATE ACTIVATED WITH TERBIUM; AND III. 10-70 PERCENT OF A RED-EMITTING PHOSPHOR CONSISTING ESSENTIALLY OF AT LEAST ONE OF YTTRIUM OXIDE ACTIVATED WITH TRIVALENT EUROPIUM, LITHIUM INDATE ACTIVATED WITH TRIVALENT EUROPIUM, YTTRIUM VANADATE ACTIVATED WITH TRIVALENT EUROPIUM, AND YTTRIUM PHOSPHATE VANADATE ACTIVATED WITH TRIVALENT EUROPIUM; AND B. MEANS FOR ENERGIZING SAID MIXTURE OF PHOSPHORS TO A VISIBLE-LIGHT-GENERATING CONDITION.
Claim 3
Dependent Claim
27 words
The lamp of claim 1, wherein said blue-emitting phosphor is strontium chloroapatite activated with divalent europium and said red-emitting phosphor is yttrium oxide activated with trivalent europium.
Claim 4
Dependent Claim
26 words
The lamp of claim 1, wherein said blue-emitting phosphor is strontium chloroapatite activated with divalent europium and said green-emitting phosphor is zinc silicate activated with manganese.
Claim 5
Dependent Claim
26 words
The lamp of claim 1, wherein said red-emitting phosphor is yttrium oxide activated with trivalent europium and said green-emitting phosphor is zinc silicate activated with manganese.
Claim 6
Dependent Claim
36 words
The lamp of claim 1, wherein said blue-emitting phosphor is strontium chloroapatite activated with divalent europium, said green-emitting phosphor is zinc silicate activated with manganese, and said red-emitting phosphor is yttrium oxide activated with trivalent europium.
Claim 7
Dependent Claim
52 words
The lamp of claim 5, wherein 3-11 percent of strontium chloroapatite activated with divalent europium, 27-46 percent of zinc silicate activated with manganese, and 46-70 percent of yttrium oxide activated with trivalent europium are used, whereby said lamp will generate white light generally of a quality of the Warm White chromaticity specification.
Claim 8
Dependent Claim
52 words
The lamp of claim 5, wherein 11-22 percent of strontium chloroapatite activated with divalent europium, 30-50 percent of zinc silicate activated with manganese, and 30-55 percent of yttrium oxide activated with trivalent europium are used, whereby said lamp will generate white light generally of a quality of the Cool White chromaticity specification.
Claim 9
Dependent Claim
26 words
The lamp of claim 1, wherein said lamp is a fluoroscent lamp having a product of color rendering index and lumens per watt of approximately 6,300-7,300.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |