Microfilm reader printer equipped with improved exposure amount

Details Microfilm reader printer equipped with improved exposure amount Microfilm reader printer equipped with improved exposure amount

1981-09-08

1984-02-28

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 57, 355 68, 355 69, G03B 2752

Patent

active

044339062

ABSTRACT:
A microfilm reader printer which includes a photo detector provided in a light path from a light source to a projecting surface, a control arrangement for setting quantity of light on the projecting surface to a predetermined value in accordance with an output of the photo detector, and an arrangement for compensating an error between change in output of the photo detector and change in quantity of light on the projecting surface in response to changeover of the projection magnification, in accordance with the changed projection magnification. By the above arrangement, the quantity of light on the projecting surface is maintained at the predetermined constant value regardless of the changeover of the projection magnification.

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patent: 4172657 (1979-10-01), Watanabe et al.
patent: 4278334 (1981-07-01), Maeda

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