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US4461978A
Expired / Lapsed
US
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Method of driving gas discharge light-emitting devices
Assignee: Hitachi Ltd
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Filing: 1982-07-15
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Granted: 1984-07-24
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Expires: 2002-07-15
Abstract
Abstract A method of driving a gas discharge light-emitting device is disclosed which utilizes Townsend emission occurring transiently when discharge is started by applying power to a gas discharge light-emitting device so as to cause discharge and stopping the application of the power approximately when the ratio of radiation output of the discharge to the charged power starts decreasing.
Inventors
- 👤 Shigeo Mikoshiba
- 👤 Shinichi Shinada
- 👤 Shoji Shirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:33
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/28; G09G3/288; G09G3/291; G09G3/30; G09G3/32; G09G3/3208; G09G3/3275; G09G3/3291; G09G3/282
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
In a method of driving a gas discharge light-emitting device consisting of at least a pair of electrodes, a gas charged around said electrodes and an air-tight container for holding said gas, the improvement wherein power is applied to said gas discharge light-emitting device through said electrodes so as to cause discharge, and the application of said power is terminated approximately when the ratio of radiation output of said discharge to the charged power starts decreasing.
Claim 2
Dependent Claim
76 words
In a method of driving a gas discharge light-emitting device consisting of at least a pair of electrodes, a gas charged around said electrodes and an air-tight container for holding said gas, the improvement wherein power is applied to said gas discharge light-emitting device through said electrodes so as to cause discharge, and the application of said power is terminated approximately when the ratio of radiation output of said discharge to the charged power starts decreasing.
Claim 3
Dependent Claim
41 words
The method of driving a gas discharge light-emitting diode as defined in claim 1, wherein the time width from when power is applied to when the power is no longer applied is up to three times the width of Townsend emission.
Claim 4
Dependent Claim
39 words
The method of driving a gas discharge light-emitting device as defined in claim 1 wherein the time width from when the power is applied to when the power is no longer applied is from 0.05 μs to 0.5 μs.
Claim 5
Dependent Claim
42 words
The method of driving a gas discharge light-emitting device as defined in claim 1 wherein the time width from when power is applied to when power is no longer applied is from 1/4 times to 1.5 times the width of Townsend emission.
Claim 6
Dependent Claim
37 words
The method of driving a gas discharge light-emitting device as defined in claim 1 wherein the time width from when power is applied to when power is no longer applied is from 0.05 μs to 0.3 μs.
Claim 7
Independent Claim
31 words
The method of driving a gas discharge light-emitting device as defined in any of claims 2 through 5 wherein a pulse voltage having said time width is applied as said power.
Claim 8
Dependent Claim
25 words
The method of driving a gas discharge light-emitting device as defined in claim 6 wherein said pulse voltage is from 200 V to 1,000 V.
Claim 9
Dependent Claim
25 words
The method of driving a gas discharge light-emitting device as defined in claim 6 wherein said pulse voltage is from 200 V to 400 V.
Claim 10
Dependent Claim
25 words
The method of driving a gas discharge light-emitting device as defined in claim 1 wherein the start and stop of said power are periodically repeated.
Claim 11
Dependent Claim
26 words
The method of driving a gas discharge light-emitting device as defined in claim 9 wherein the period of repetition is from 7 μs to 100 μs.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |