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Patent US3764210A successfully refreshed from Google Patents.
US3764210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A lighting system for a halogen lamp in a duplicating machine
Assignee: Minolta Co Ltd
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Filing: 1970-11-03
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Granted: 1973-10-09
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Expires: 1990-11-03
Abstract
Abstract A halogen exposure lamp in a copying machine is controlled to provide a voltage less than the rated voltage for preheating the halogen lamp and is periodically energized with a voltage in excess of its rated voltage for exposing an original. The halogen lamp can be controlled by connecting additional voltage sources to the lamp or by controlling the conductive phase angle of the effective voltage applied to the lamp.
Inventors
- 👤 K Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A lighting system for a halogen lamp in an electronic copying machine, comprising: a halogen lamp; an AC electric power source for generating an effective voltage higher by 10 to 300 percent than the rated voltage of said halogen lamp; means for changing the conductive phase angle of the power applied to said halogen lamp; and means for selecting the conductive phase angle of said means for changing the conductive phase angle between a conductive phase angle for applying an effective voltage to said halogen lamp lower than the rated voltage thereof to preheat said halogen lamp for maintaining the halogen cycle thereof and a conductive phase angle for applying an effective voltage higher by 10 to 300 percent than the rated voltage thereof to light said halogen lamp for 0.1 to 2 seconds.
Claim 2
Dependent Claim
134 words
A lighting system for a halogen lamp in an electronic copying machine, comprising: a halogen lamp; an AC electric power source for generating an effective voltage higher by 10 to 300 percent than the rated voltage of said halogen lamp; means for changing the conductive phase angle of the power applied to said halogen lamp; and means for selecting the conductive phase angle of said means for changing the conductive phase angle between a conductive phase angle for applying an effective voltage to said halogen lamp lower than the rated voltage thereof to preheat said halogen lamp for maintaining the halogen cycle thereof and a conductive phase angle for applying an effective voltage higher by 10 to 300 percent than the rated voltage thereof to light said halogen lamp for 0.1 to 2 seconds.
Claim 3
Dependent Claim
21 words
A lighting system as in claim 1, wherein said means for changing the conductive phase angle includes a silicon control rectifier.
Claim 4
Dependent Claim
19 words
A lighting system as in claim 1, wherein said means for changing the conductive phase angle includes a Thyristor.
Claim 5
Dependent Claim
75 words
A lighting system as in claim 1, wherein said means for changing the conductive phase angle includes a controlled gate, and said means for selecting the conductive phase angle includes a resistor and a rectifier connected in parallel with each other and serially connected to said electric power source and said halogen lamp, a capacitor for applying a charged voltage to said gate, and a change-over switch for selectively connecting said gate to said capacitor.
Claim 6
Dependent Claim
77 words
A lighting system as in claim 1, wherein said means for changing the conductive phase angle includes a controlled gate, and said means for selecting the conductive phase angle includes a fixed resistor and a variable resistor connected in parallel with each other and serially connected to said electric power source and said halogen lamp, a capacitor for applying a charged voltage to said gate, and a change-over switch for selectively connecting said capacitor to said gate.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |