Original size detecting apparatus of an image forming apparatus

Details Original size detecting apparatus of an image forming apparatus Original size detecting apparatus of an image forming apparatus

1989-04-21

1991-07-16

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, 355 75, 355311, G03B 2752, G03G 1500

Patent

active

050328670

ABSTRACT:
A scanner starts to move for preliminary scanning and an exposure lamp of the scanner turns on after a prescribed period after the start of the movement of the scanner. When a rear edge of an original of the minimum size placed on a platen is irradiated by the scanning, an amount of irradiation of the exposure lamp attains a prescribed amount since the prescribed period has passed from the turn-on thereof. Accordingly, insufficiency of an irradiation amount of the exposure lamp does not occur at the time of original size detecting operation. Thus, detection operation is speeded up and the first copy speed of the image forming apparatus is improved.

REFERENCES:
patent: 4568181 (1986-02-01), Nishiyama
patent: 4695154 (1987-09-01), Watanabe
patent: 4796060 (1989-01-01), Mizude
patent: 4827283 (1989-05-01), Yamamoto et al.

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