Document size detection device

Details Document size detection device Document size detection device

1990-05-11

1991-07-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for original

355311, 355317, G03B 2762

Patent

active

050363549

ABSTRACT:
A document size detection device comprising an illuminating unit for irradiating a first light on a document on a platen; a projecting unit for projecting the first light reflected on the document onto a photosensitive member; a document cover for covering the document on the platen, the cover having a reflecting area for reflecting the first light from the illuminating unit and a non-reflecting area for transmitting the above light; a document detection sensor provided at a position corresponding to the non-reflecting area and comprising a light emitting element and a light receiving element; and a filter for transmitting a second light from the light emitting element as well as guiding the first light from the illuminating unit to the projecting unit, the filter unit being opposed to a detecting surface of the sensor.

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