Auto exposure control device for reader-printer

Details Auto exposure control device for reader-printer Auto exposure control device for reader-printer

1985-01-29

1986-05-27

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, G03B 2780, G03B 2774

Patent

active

045912645

ABSTRACT:
There is disclosed an automatic exposure control device for use in a reader-printer which controls the amount of exposure in accordance with outputs of photodetectors arranged in an optical path. Each photodetector is connected to a comparator which is supplied with comparison voltage through changes of the comparison voltage stepwise. The control device changes the amount of variation per step of comparison voltage in accordance with a change of the type of film to the positive or to the negative, and limits the photodetectors to be used for controlling only to the photodetectors being capable of receiving the light of micro film image.

REFERENCES:
patent: 3790275 (1974-02-01), Huboi et al.
patent: 3926518 (1975-12-01), Berry et al.
patent: 3977778 (1976-08-01), Seko et al.
patent: 4367033 (1983-01-01), Watanabe
patent: 4433906 (1984-02-01), Nukatani et al.

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