Method and apparatus for preventing light source degradation in

Details Method and apparatus for preventing light source degradation in Method and apparatus for preventing light source degradation in

1989-10-31

1991-01-22

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2772

Patent

active

049874446

ABSTRACT:
An apparatus for preventing degradation of a light source in an exposure apparatus using a halogen lamp as a light source includes an intermittent turning on circuit for intermittently turning on the halogen lamp, a counter for accumulating the intermittent on-time of the halogen lamp, a determining apparatus for determining whether or not the counted value has reached a prescribed value, and a circuit for keeping on the halogen lamp for realizing a halogen cycle. When the determining apparatus determines that accumulated value of the intermittent on-time of the halogen lamp has reached the prescribed value, the halogen lamp is kept on continuously for a period of time necessary for the halogen cycle.

REFERENCES:
patent: 4736224 (1988-04-01), Watanabe

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