Light source device

Details Light source device Light source device

1988-02-16

1989-08-15

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, 355 68, G03B 2772

Patent

active

048579670

ABSTRACT:
In a light source device in which one or more light emitting tubes are adapted to emit light sequentially, there are provided one or more counters for counting the number of times of failure of light emission of the light emitting tubes, and comparator or judging circuit for comparing the number counted by the counters with a predetermined number to produce an interruption signal when the counted number is over the predetermined value, a control unit acts to interrupt the light emission of the light emitting tube in response to the interruption signal and a warning device is activated for indicating a warning in response to the interruption signal.

REFERENCES:
patent: 3887279 (1975-06-01), Rubin
patent: 4272183 (1981-06-01), Maese et al.
patent: 4551011 (1981-11-01), Yuasa et al.
patent: 4608522 (1986-08-01), Yuasa et al.
patent: 4693589 (1987-09-01), Watanabe et al.
patent: 4704025 (1987-11-01), Yuasa et al.
patent: 4711569 (1987-12-01), Nishimori et al.

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