Automatic exposure device

Details Automatic exposure device Automatic exposure device

1989-05-31

1991-02-05

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355 68, 355 69, 355214, G03G 1504

Patent

active

049909576

ABSTRACT:
An automatic exposure control device for use in a copying machine in which a light source for illuminating the light to an original document is controlled based on the signal representing the light amount of the original document sensed by a light senses. There are two kinds of HIGH level limiter for limiting the upper limit of the power supplied to the light source. The HIGH level limiters are selected depending on whether the amount of light of the light source has been raised sufficiently or not, whereby over exposure copy or foggy copy can be prevented.

REFERENCES:
patent: 4124294 (1978-11-01), Nakamura
patent: 4674863 (1987-06-01), Tomosada et al.
patent: 4796060 (1989-01-01), Mizude
patent: 4831418 (1989-05-01), Ito et al.
patent: 4910554 (1990-03-01), Noda

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