US4887002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge lamp and apparatus utilizing the same
Assignee: Toshiba Corp
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Filing: 1987-12-01
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Granted: 1989-12-12
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Expires: 2007-12-01
Abstract
Abstract A gas discharge lamp has a discharge gas sealed in a light-transmissive, cylindrical tube in which an internal electrode is provided as a first receiving end. An external electrode having predetermined widths along the axis of the tube is provided on the outer surface of the tube as a second receiving end. A shielding film is also provided on the outer surface of the tube excluding where a slit with a predetermined width is formed. The widths of the external electrode can be changed in accordance with the luminance distribution of the gas discharge lamp. The internal and external electrodes are connected to a high frequency power source and are applied with high frequency power therefrom, thereby causing discharge within the tube.
Inventors
- 👤 Yoshitomi Dobashi
- 👤 Akihiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:46
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35; H01J65/00; H01J65/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A gas discharge lamp comprising: a tube having a discharge gas therein; an internal electrode provided within said tube; and an external electrode provided on an outer surface of said tube generally parallel to an axis of said tube, said external electrode having a width that is non-uniform along said axis, the width at various positions along said axis being selected so as to obtain a desired luminance distribution, said internal and external electrodes being adapted to be coupled to a high frequency power source to cause discharge within said tube.
Claim 2
Dependent Claim
91 words
A gas discharge lamp comprising: a tube having a discharge gas therein; an internal electrode provided within said tube; and an external electrode provided on an outer surface of said tube generally parallel to an axis of said tube, said external electrode having a width that is non-uniform along said axis, the width at various positions along said axis being selected so as to obtain a desired luminance distribution, said internal and external electrodes being adapted to be coupled to a high frequency power source to cause discharge within said tube.
Claim 3
Dependent Claim
28 words
A gas discharge lamp according to claim 1, wherein the width of said external electrode is selected so as to obtain substantially uniform luminance distribution along said axis.
Claim 4
Dependent Claim
31 words
A gas discharge lamp according to claim 2, wherein said external electrode positioned at a centerportion of said tube is formed narrower than that positioned near the ends of said tube.
Claim 5
Dependent Claim
23 words
A gas discharge lamp according to claim 1, wherein said discharge gas is at least one of xenon, krypton, argon, neon and helium.
Claim 6
Dependent Claim
23 words
A gas discharge lamp according to claim 4, wherein said discharge gas is xenon having its vapor pressure of 30 to 160 Torr.
Claim 7
Dependent Claim
15 words
A gas discharge lamp according to claim 4, wherein said discharge gas further includes mercury.
Claim 8
Dependent Claim
25 words
A gas discharge lamp according to claim 1, wherein said tube has inner and outer diameters of below 2 mm and below 3 mm, respectively.
Claim 9
Dependent Claim
23 words
A gas discharge lamp according to claim 1, which further comprises a fluorescent material layer formed on an inner surface of said tube.
Claim 10
Dependent Claim
26 words
A gas discharge lamp according to claim 1, which further comprises light shielding means formed on said tube for partly shielding light emitted by the discharge.
Claim 11
Dependent Claim
119 words
A gas discharge lamp apparatus comprising: a gas discharge lamp device including a tube having a discharge gas therein, an internal electrode provided within said tube, and an external electrode provided on an outer surface of said tube generally parallel to an axis of said tube, said external electrode having a width that is non-uniform along said axis, the width at various positions along said axis being selected so as to obtain a desired luminance distribution; and a high frequency power source for applying high frequency power to said internal and external electrodes of said gas discharge lamp device to cause discharge within said tube and irradiating visible rays generated by said discharge to the outside of said tube.
Claim 12
Dependent Claim
119 words
A gas discharge lamp apparatus comprising: a gas discharge lamp device including a tube having a discharge gas therein, an internal electrode provided within said tube, and an external electrode provided on an outer surface of said tube generally parallel to an axis of said tube, said external electrode having a width that is non-uniform along said axis, the width at various positions along said axis being selected so as to obtain a desired luminance distribution; and a high frequency power source for applying high frequency power to said internal and external electrodes of said gas discharge lamp device to cause discharge within said tube and irradiating visible rays generated by said discharge to the outside of said tube.
References Cited (Backward Citations)
GB2067826A
Cited
JPS5738571A
Cited
JPS5834560A
Cited
US4645979A
Cited
JPH06163760A
Cited
JPH06195052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |