US4347462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp lighting device
Assignee: Mitsubishi Electric Corp
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Filing: 1980-12-19
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Granted: 1982-08-31
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Expires: 2000-12-19
Abstract
Abstract A discharge lamp starting device such as for a fluorescent lamp in which a nonlinear capacitor is connected in parallel with a discharge lamp with a Zener diode connected in series with the nonlinear capacitor. A semiconductor switching device, such as a diode thyristor, is connected in parallel with the discharge lamp. Due to the presence of the Zener diode, the semiconductor switching device can have a wide range of threshold voltage so that the cost of the device is low.
Inventors
- 👤 Hiromi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:36
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/042; H05B41/044; Y; Y10; Y10S; Y10S315/00; Y10S315/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
A discharge lamp lighting device comprising: a discharge lamp; an inductive stabilizer connected in series with said discharge lamp; a nonlinear capacitor; semiconductor switch means connected in parallel with said discharge lamp; a Zener diode connected in series with said nonlinear capacitor with the series connected nonlinear capacitor and Zener diode coupled in parallel with said discharge lamp.
Claim 2
Dependent Claim
58 words
A discharge lamp lighting device comprising: a discharge lamp; an inductive stabilizer connected in series with said discharge lamp; a nonlinear capacitor; semiconductor switch means connected in parallel with said discharge lamp; a Zener diode connected in series with said nonlinear capacitor with the series connected nonlinear capacitor and Zener diode coupled in parallel with said discharge lamp.
Claim 3
Dependent Claim
29 words
The device as claimed in claim 1 in which said capacitor is such that, upon application of a voltage higher than a predetermined value, said capacitor stops storing charge.
Claim 4
Dependent Claim
18 words
The device as claimed in claim 1 in which said semiconductor switch means comprises a bi-directional diode thyristor.
Claim 5
Dependent Claim
19 words
The device as claimed in claim 1 in which said semiconductor switch means comprises a reverse blocking diode thyristor.
References Cited (Backward Citations)
US4119886A
Cited
US4165475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |