US4267485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp with sharp emission peaks betwen 480 and 490 nm and between 620 and 640 nm
Assignee: Mitsubishi Electric Corp
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Filing: 1978-10-25
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Granted: 1981-05-12
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Expires: 1998-10-25
Abstract
Abstract A fluorescent lamp having excellent color rendering property and high luminous efficiency comprises a fluorescent layer coated on an inner surface of a discharge tube. The fluorescent layer mainly comprises a first fluorescent material having-emission peak in a range of wavelength of 480 to 490 nm which is an alkaline earth metal boron phosphate activated by a divalent europium compound having the formula m(Sr1-x-y-pBaxCayEupO)x(1-n)P2O5xnB2O3 wherein the parameters x, y, p, m and n are in ranges of 0</=x</=0.5 0</=y</=0.2 0.001</=p</=0.15 1.75</=m</=2.30 and 0.05</=n</=0.23 and a second fluorescent material having the emission peak in a range of wavelength of 620 to 649 nm and a band width (50%) of 120 to 160 nm.
Inventors
- 👤 Katsuo Murakami
- 👤 Yoshinori Anzai
- 👤 Mitsuoki Otani
- 👤 Hiroshi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:52
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71; C09K11/59; C09K11/62; C09K11/67; C09K11/68; C09K11/74; C09K11/75; C09K11/76; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/774; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A fluorescent lamp which comprises a luminous layer comprising mainly a first fluorescent material having the emission peak in a range of wavelength of 480 to 490 nm and a second fluorescent material having the emission peak in a range of wavelength of 620 to 640 nm and a band width (50%) of 120 to 160 nm, on an inner surface of a discharge tube wherein the first fluorescent material is an alkaline earth metal boron phosphate activated by a divalent europium compound having the formula m(Sr.sub.1-x-y-p Ba.sub.x Ca.sub.y Eu.sub.p O)·(1-n)P.sub.2 O.sub.5 ·nB.sub.2 O.sub.3, wherein the parameters x, y, p, m, and n are respectively in ranges of 0≦x≦0.5 0≦y≦0.2 0.001≦p≦0.15 1.75≦m≦2.30 and 0.05≦n≦0.23.
Claim 2
Dependent Claim
114 words
A fluorescent lamp which comprises a luminous layer comprising mainly a first fluorescent material having the emission peak in a range of wavelength of 480 to 490 nm and a second fluorescent material having the emission peak in a range of wavelength of 620 to 640 nm and a band width (50%) of 120 to 160 nm, on an inner surface of a discharge tube wherein the first fluorescent material is an alkaline earth metal boron phosphate activated by a divalent europium compound having the formula m(Sr.sub.1-x-y-p Ba.sub.x Ca.sub.y Eu.sub.p O)·(1-n)P.sub.2 O.sub.5 ·nB.sub.2 O.sub.3, wherein the parameters x, y, p, m, and n are respectively in ranges of 0≦x≦0.5 0≦y≦0.2 0.001≦p≦0.15 1.75≦m≦2.30 and 0.05≦n≦0.23.
Claim 3
Dependent Claim
48 words
A fluorescent lamp according to claim 1 wherein the second fluorescent material is a strontium-magnesium phosphate activated by tin or a modified one wherein a part of the strontium is substituted with barium or calcium or the a part or whole of the magnesium is substituted with zinc.
Claim 4
Dependent Claim
211 words
A fluorescent lamp according to claim 1 wherein the first fluorescent material having the emission peak in a range of wavelength of 480 to 490 nm and the formula defined and the second fluorescent material having the emission peak in a range of wavelength of 620 to 640 nm and a band width (50%) of 120 to 160 nm are combined with one or more of a third to sixth fluorescent materials defined below to form a luminous layer on an inner surface of the discharge tube; (a) the third fluorescent material having the emission peak in a range of wavelength of 470 to 500 nm and a band width of 140 to 150 nm; (b) the fourth fluorescent material having the emission peak in a range of wavelength of 520 to 540 nm and a band width of 40 to 50 nm; (c) the fifth fluorescent material having the emission peak in a range of wavelength of 655 to 660 nm which mainly emits in a range of wavelength of 600 to 700 nm; and (d) the sixth fluorescent material having two emission peaks in ranges of 470 to 500 nm and 570 to 590 nm which mainly emits in a range of visible wavelength of 400 to 700 nm.
Claim 5
Dependent Claim
48 words
A fluorescent lamp according to claim 3 wherein the second fluorescent material is a strontium-magnesium phosphate activated by tin or a modified one wherein a part of the strontium is substituted with barium or the calcium or a part or whole of the magnesium is substituted with zinc.
Claim 6
Dependent Claim
25 words
A fluorescent lamp according to claim 3 wherein the third fluorescent material is an alkaline earth metal halophosphate activated by antimony or a magnesium tungstate.
Claim 7
Dependent Claim
24 words
A fluorescent lamp according to claim 3 wherein the fourth fluorescent material is zinc silicate activated by manganese or zinc-magnesium silicate-germanate activated by manganese.
Claim 8
Dependent Claim
24 words
A fluorescent lamp according to claim 3 wherein the fifth fluorescent material is magnesium fluorogermanate activated by manganese or magnesium-lithium aresenate activated by manganese.
Claim 9
Dependent Claim
21 words
A flourescent lamp according to claim 3 wherein the sixth fluorescent material is an alkaline earth metal halophosphate activated by antimony-manganese.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |