Exposure detecting device for copying machine

Details Exposure detecting device for copying machine Exposure detecting device for copying machine

1983-07-25

1985-08-06

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 14E, G03B 2774

Patent

active

045332380

ABSTRACT:
An exposure detecting device for a copying machine having an optical system which produces an image of an original on a photosensitive drum using an image forming lens and at least one mirror. At least one mirror in the optical system is implemented with a multilayer film interference filter which transmits light rays in a spectral range in which said photosensitive body is not sensitive and reflects light rays in other ranges. A photosensor is arranged on the rear surface of the multilayer film interference filter. The output of the photosensor is applied to control the intensity of a light source used for forming the image of the original on the photosensitive drum.

REFERENCES:
patent: 4117375 (1978-09-01), Bachur et al.
patent: 4433906 (1984-02-01), Nakatani et al.

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