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US4945291A
Expired / Lapsed
US
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Lamp-lighting device
Assignee: Individual
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Filing: 1988-04-12
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Granted: 1990-07-31
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Expires: 2008-04-12
Abstract
Abstract Disclosed is a novel lamp-lighting device, comprising a full-wave rectifier having both an input terminal connected with an ac source and an output terminal connected with a lamp, a smoothing means connected in parallel with the lamp, means to detect a voltage across the lamp that exceeds a prescribed level, means to switch the operation of said rectifier to half-wave rectification mode, and means to connect said switching means with said detecting means.
Inventors
- 👤 Kazumi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:46
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B39/00; H05B39/04; H05B39/041; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A device for lighting an incandescent lamp, consisting of: a full-wave rectifier having both an input terminal connected with an ac source and an output terminal connected with an incandescent lamp; a smoothing means connected in parallel with the incandescent lamp; a detecting means to monitor a voltage across the incandescent lamp; and means to switch the operation of said rectifier to half-wave rectification mode, said switching means switching the operation of said rectifier to half-wave rectification mode in order to decrease a voltage across the incandescent lamp to a prescribed level when a voltage across the incandescent lamp exceeds the prescribed level and is detected by said detecting means; and means to connect said switching means with said detecting means.
Claim 2
Independent Claim
121 words
A device for lighting an incandescent lamp, consisting of: a full-wave rectifier having both an input terminal connected with an ac source and an output terminal connected with an incandescent lamp; a smoothing means connected in parallel with the incandescent lamp; a detecting means to monitor a voltage across the incandescent lamp; and means to switch the operation of said rectifier to half-wave rectification mode, said switching means switching the operation of said rectifier to half-wave rectification mode in order to decrease a voltage across the incandescent lamp to a prescribed level when a voltage across the incandescent lamp exceeds the prescribed level and is detected by said detecting means; and means to connect said switching means with said detecting means.
Claim 3
Dependent Claim
14 words
The device of claim 1, wherein said detecting means comprises a voltage regulation diode.
Claim 4
Dependent Claim
13 words
The device of claim 1, wherein said connecting means is a magnetic relay.
Claim 5
Dependent Claim
12 words
The device of claim 1, wherein said full-wave rectifier consists of diodes.
Claim 6
Dependent Claim
15 words
The device of claim 1, wherein said full-wave rectifier consists of diodes and a thyristor.
Claim 7
Dependent Claim
16 words
The device of claim 1, wherein a surge-limiting means is connected in series with the lamp.
Claim 8
Dependent Claim
19 words
The device of claim 1, wherein a choke coil is connected with the input terminal of the full-wave rectifier.
References Cited (Backward Citations)
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FR2574613A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |