EP0348979A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fluorescent lamp apparatus
Assignee: Toshiba Lighting and Technology Corp
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Filing: 1989-06-29
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Granted: —
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Expires: 2009-06-29
Abstract
Abstract A fluorescent lamp apparatus is disclosed which (15) includes a fluorescent lamp including a discharge tube (16) having a discharge space (17) filled with a gas conducive to light emission and electrodes (20) sealed one at each end of the tube and having a phosphor layer (21) coated on an inner surface (18) of the tube (16) and a high-frequency lighting circuit (30) for supplying a high-frequency electric power with a potential gradient set at over 5 V/cm, in which a light-transmitting electric insulation layer (22) is provided between the phosphor layer (21) and the inner surface (18) of the tube (16). The fluorescent lamp apparatus is of such a type that mercury ions within the discharge space (17) are prevented by the insulating layer from intruding in the wall of the tube (16).
Inventors
- 👤 Akihiro Inoue
- 👤 Shinichi Tsunekawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:58
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
124 words
A fluorescent lamp apparatus comprising: a fluorescent lamp (15) including a discharge tube (16, 50, 51) filled with a discharge gas, a pair of electrodes (20, 20) provided within said tube (16, 50, 51) and a phosphor layer (21) coated on the inner surface (18) of said tube (16, 50, 51); and means (30) for applying a high-frequency electric power to said lamp; characterized in that said fluorescent lamp (15) includes an electrically insulating layer (22) formed between an inner surface (18) of said tube (16, 50, 51) and the phosphor layer (21) to allow light to be passed and said means (30) for applying a high-frequency electric power is adopted to operate said lamp (15) at a potential gradient set over 5 V/cm.
Claim 2
Dependent Claim
124 words
A fluorescent lamp apparatus comprising: a fluorescent lamp (15) including a discharge tube (16, 50, 51) filled with a discharge gas, a pair of electrodes (20, 20) provided within said tube (16, 50, 51) and a phosphor layer (21) coated on the inner surface (18) of said tube (16, 50, 51); and means (30) for applying a high-frequency electric power to said lamp; characterized in that said fluorescent lamp (15) includes an electrically insulating layer (22) formed between an inner surface (18) of said tube (16, 50, 51) and the phosphor layer (21) to allow light to be passed and said means (30) for applying a high-frequency electric power is adopted to operate said lamp (15) at a potential gradient set over 5 V/cm.
Claim 3
Dependent Claim
14 words
The apparatus according to claim 1, characterized in that said discharge gas contains mercury.
Claim 4
Dependent Claim
14 words
The apparatus according to claim 1, characterized in that said discharge gas contains xenon.
Claim 5
Dependent Claim
19 words
The apparatus according to claim 1, characterized in that said electric insulating layer (22) is formed of powdered alumina.
Claim 6
Dependent Claim
22 words
The apparatus according to claim 1, characterized in that said tube is circular in cross-section and below 7 mm in inner diameter.
Claim 7
Dependent Claim
28 words
The apparatus according to claim 1, characterized in that said tube is elliptical in cross-section and has a major diameter and a minor diameter of below 7 mm.
Claim 8
Dependent Claim
116 words
A fluorescent lamp apparatus comprising: a fluorescent lamp (15) including a discharge tube (16, 50, 51) filled with a discharge gas, an electrode (20, 60) provided within said tube (16, 50, 51), and a phosphor layer (21) coated on an inner surface (18) of said tube (16, 50, 51); and a proximity electroconductive member (10, 40, 61) provided near an outer surface (19) of said tube (16, 50, 51); and means (30) for applying a high-frequency electric power to said lamp to operate said lamp (15), characterized in that the fluorescent lamp (15) includes an electrically insulating layer (22) formed on a surface (15, 19) of said tube (16, 50, 51) to allow light to pass.
Claim 9
Dependent Claim
116 words
A fluorescent lamp apparatus comprising: a fluorescent lamp (15) including a discharge tube (16, 50, 51) filled with a discharge gas, an electrode (20, 60) provided within said tube (16, 50, 51), and a phosphor layer (21) coated on an inner surface (18) of said tube (16, 50, 51); and a proximity electroconductive member (10, 40, 61) provided near an outer surface (19) of said tube (16, 50, 51); and means (30) for applying a high-frequency electric power to said lamp to operate said lamp (15), characterized in that the fluorescent lamp (15) includes an electrically insulating layer (22) formed on a surface (15, 19) of said tube (16, 50, 51) to allow light to pass.
Claim 10
Dependent Claim
28 words
The apparatus according to claim 7, characterized in that said electrical insulating layer (22) is formed between an inner surface of said tube and said phosphor layer (20).
Claim 11
Dependent Claim
23 words
The apparatus according to claim 7, characterized in that said electrical insulating layer (22) is formed on an outer surface (19) said tube.
Claim 12
Dependent Claim
34 words
The apparatus according to claim 7, characterized in that a distance between an outer surface (19) of said tube (16, 50, 51) and said proximity electroconductive member (10, 40, 61) is below 10 mm.
Claim 13
Dependent Claim
26 words
The apparatus according to claim 10, characterized in that said proximity electroconductive member is an external electrode (61) which causes a discharge relative to said electrode.
Claim 14
Dependent Claim
14 words
The apparatus according to claim 7, characterized in that said discharge gas contains mercury.
Claim 15
Dependent Claim
14 words
The apparatus according to claim 7, characterized in that said discharge gas contains xenon.
Claim 16
Dependent Claim
16 words
The apparatus according to claim 7, characterized in that said electric insulating layer is powdered alumina.
Claim 17
Dependent Claim
23 words
The apparatus according to claim 7, characterized in that said tube (16) is circular in cross-section and below 7 mm in inner diameter.
Claim 18
Dependent Claim
28 words
The apparatus according to claim 8, characterized in that said tube is elliptical in cross-section and has a major diameter and a minor diameter of below 7 mm.
References Cited (Backward Citations)
No citation records indexed.
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