Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1995-06-26
1997-08-19
Pascal, Robert
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315159, 315116, 315360, 315 94, H05B 3702
Patent
active
056592272
ABSTRACT:
A fluorescent lamp controller for an original-document exposing apparatus includes a detection circuit for detecting the quantity of light emitted by a fluorescent lamp, an actuator for applying between filaments of the fluorescent lamp a voltage having a duty that is determined in accordance with the quantity of light detected, and a preheating circuit for preheating each of the filaments of the fluorescent lamp by applying a preheating voltage. According to the present invention, the actuator applies, between the filaments of the fluorescent lamp, a voltage having a duty which is smaller than the full duty regardless of a result of the quantity of light detected in a predetermined period at a start of turning the fluorescent lamp on, and the preheating circuit applies the preheating voltage to each of the filaments of the fluorescent lamp simultaneously with the application of the turning on voltage.
REFERENCES:
patent: 4378515 (1983-03-01), Nakai et al.
patent: 4533853 (1985-08-01), Hammond et al.
patent: 4533854 (1985-08-01), Northrup
patent: 4797598 (1989-01-01), Oikawa et al.
patent: 5095329 (1992-03-01), Morikawa
Miyamoto Kazuki
Ohki Naoyuki
Takata Shin-ichi
Ushiro Takahiro
Canon Kabushiki Kaisha
Pascal Robert
Philogene Haissa
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