EP0625793A2
Expired / Lapsed
EP
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Fluorescent lamp for use in aquaria
Assignee: Interpet Ltd
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Filing: 1994-05-05
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Granted: —
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Expires: 2014-05-05
Abstract
Abstract A fluorescent lamp produces light having colour coordinates within an ellipse (A) about 22 standard deviation of colour matching around the colour coordinates (B) x = 0.344 y = 0.302. The luminescent layer of the lamp comprises a mixture of: magnesium fluorogermanate activated by manganese as red emitter; calcium halophosphate as white emitter; and a blue emitter preferably strontium pyrophosphate activated by divalent tin. The layer may alternatively be a mixture of red emitting magnesium fluorogermanate and blue emitting barium titanium pyrophosphate. Other blue emitters are disclosed. <IMAGE>
Inventors
- 👤 Milroy Gamani Abeywickrama
- 👤 Adrian Justin Exell
- 👤 Martin Paul Andrew Baines
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:59
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71; C09K11/66; C09K11/664; C09K11/665; C09K11/67; C09K11/671; C09K11/673; C09K11/74; C09K11/75; C09K11/76; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A fluorescent lamp for use in aquaria, the luminescent layer in said lamp comprising a mixture of: a red emitting phosphor emitting predominantly at about 660 nm; and a blue emitting phosphor emitting predominantly in the range 420 to 495 nm with a half peak width in the range 100 to 170 nm; and optionally a white emitting phosphor; the phosphors being blended to form said mixture in such proportions that the colour coordinates of the lamp on the CIE chromaticity diagram differ from the point x = 0.344 y = 0.302 in any direction by no more than 22 standard deviations of colour matching (SDCM).
Claim 2
Dependent Claim
50 words
A lamp according to claim 1 wherein said mixture comprises the said red emitting phosphor, the said blue emitting phosphor and said white emitting phosphor, the red emitting phosphor being Magnesium Fluorogermanate activated by Manganese and the white emitting phosphor being a Calcium Halophosphate activated with both Antimony and Manganese.
Claim 3
Dependent Claim
17 words
A lamp according to claim 2 wherein the blue emitting phosphor is Strontium Pyrophosphate activated by Tin.
Claim 4
Dependent Claim
33 words
A lamp according to claim 2 wherein the blue emitting phosphor is a compound of the formula: Ca (1-x) Mg x WO₄ optionally activated by Lead, where O≦x≦1; or Ca₅F(PO₄)₃ activated by Antimony.
Claim 5
Dependent Claim
23 words
A lamp according to claim 3 wherein the blue, red and white emitting phosphors are mixed in the ratio, by weight, 45:30:25 respectively.
Claim 6
Dependent Claim
48 words
A lamp according to claim 1 wherein said mixture is a binary mixture of the red emitting phosphor and the blue emitting phosphor, the red emitting phosphor being Magnesium Fluorogermanate activated by Manganese and the blue emitting phosphor being Barium Titanium Pyrophosphate or Strontium Fluorophosphate activated with Antimony.
References Cited (Backward Citations)
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