Image forming apparatus

Details Image forming apparatus Image forming apparatus

1989-08-04

1990-11-27

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355231, 355243, G03G 2100

Patent

active

049740229

ABSTRACT:
An image forming apparatus comprises an original table for carrying an original with an image thereon, an original cover for covering the original table along with the original thereon, image carriers, an optical scanning system for optically scanning the original on the original table and forming an image corresponding to the image of the original on the image carrier, two optical detectors which is are simultaneously moved for scanning the original table with the original thereon. The two optical detectors independently detect at predetermined positions the presence or absence of the original on the original table, and output signals indicative of the presence or absence of the original at the predetermined positions. The apparatus also includes a discriminating circuit for discriminating the size of the original by finding out the logical sum of the signals from the two detectors.

REFERENCES:
patent: 4585332 (1986-04-01), Shenoy
patent: 4692019 (1987-09-01), Morimoto et al.
patent: 4851883 (1989-07-01), Ito

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