EP0067030A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A fluorescent lamp
Assignee: Toshiba Corp
•
Filing: 1982-06-02
•
Granted: —
•
Expires: 2002-06-02
Abstract
Abstract A compact fluorescent lamp (10) having a vacuum tube (1) which is convoluted in shape, and having a wall loading between 600 and 900 W/m<2> is disclosed. The inner surface of the tube is coated with a phosphor layer (2) including a blue light-emitting phosphor, a green light-emitting phosphor and a red light-emitting phosphor. The red light-emitting phosphor is at least 40 percent of the phosphor layer by weight and the phosphor layer is as resistant to ultraviolet radiation as a conventional straight tube.
Inventors
- 👤 Hiroyuki C/O Patent Division Ebara
- 👤 Taketo C/O Patent Division Kamei
- 👤 Kenji C/O Patent Division Oda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:46
CPC Classifications
A; A23; A23C; A23C9/00; A23C9/12; A23C9/123; A23C9/1232; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; A23B; A23B11/00; A23B11/10; A23B11/14; A23B2/00; A23B2/90; A23B2/92; A23C9/13; A23V; A23V2400/00; A23V2400/11; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
A fluorescent lamp comprising: a vacuum-tight radiation transmitting tube; mercury and rare gas in said tube; electrodes in said tube between which discharge takes place during operation; and a phosphor layer coating a surface of said tube, said phosphor layer including a plurality of phosphors including at least a red light-emitting phosphor, at least 40 percent by weight of said phosphor layer being said red light-emitting phosphor.
Claim 2
Dependent Claim
67 words
A fluorescent lamp comprising: a vacuum-tight radiation transmitting tube; mercury and rare gas in said tube; electrodes in said tube between which discharge takes place during operation; and a phosphor layer coating a surface of said tube, said phosphor layer including a plurality of phosphors including at least a red light-emitting phosphor, at least 40 percent by weight of said phosphor layer being said red light-emitting phosphor.
Claim 3
Dependent Claim
81 words
A compact fluorescent lamp comprising: a vacuum-tight radiation transmitting convoluted tube having a wall loading in the range of 600-900 W/m 2 ; mercury and rare gas in said tube; electrodes in said tube between which discharge takes place during operation; and a phosphor layer coating a surface of said tube, said phosphor layer including a plurality of phosphors including at least a red light-emitting phosphor, at least 40 percent by weight of said phosphor layer being said red light-emitting phosphor.
Claim 4
Dependent Claim
81 words
A compact fluorescent lamp comprising: a vacuum-tight radiation transmitting convoluted tube having a wall loading in the range of 600-900 W/m 2 ; mercury and rare gas in said tube; electrodes in said tube between which discharge takes place during operation; and a phosphor layer coating a surface of said tube, said phosphor layer including a plurality of phosphors including at least a red light-emitting phosphor, at least 40 percent by weight of said phosphor layer being said red light-emitting phosphor.
Claim 5
Dependent Claim
21 words
A fluorescent lamp according to claim 2, wherein said phosphor layer is disposed directly on an inner surface of said tube.
Claim 6
Dependent Claim
20 words
A fluorescent lamp according to claim 2, further comprising another phosphor layer disposed between said phosphor layer and said tube.
Claim 7
Dependent Claim
17 words
A fluorescent lamp according to claim 4, wherein said other phosphor layer includes a calcium halophosphate phosphor.
Claim 8
Dependent Claim
22 words
A fluorescent lamp according to any of claims 2 to 5, wherein said red light-emitting phosphor comprises yttrium oxide activated by europium.
Claim 9
Dependent Claim
25 words
A fluorescent lamp according to any of claims 2 to 6, wherein said phosphor layer includes a blue light-emitting phosphor and a green light-emitting phosphor.
Claim 10
Dependent Claim
83 words
A fluorescent lamp according to claim 7, wherein said blue light-emitting phosphor is at least one of: a strontium calcium halophosphate activated by europium; barium magnesium aluminate activated by europium; a strontium calcium barium halo-boro-phosphate activated by europium; and strontium chlorophosphate activated by europium, and said green light-emitting phosphor is at least one of lanthanum phosphate activated by cerium and terbium; magnesium aluminate activated by cerium and terbium, yttrium silicate activated by cerium and terbium; and lanthanum silicophosphate activated by cerium and terbium.
Claim 11
Dependent Claim
20 words
A fluorescent lamp according to any of claims 2 to 8, wherein said tube includes at least one U-shaped portion.
Claim 12
Dependent Claim
14 words
A fluorescent lamp according to claim 9, wherein said tube includes three U-shaped portions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.