Device for dtecting the size of an original document in a docume

Details Device for dtecting the size of an original document in a docume Device for dtecting the size of an original document in a docume

1996-09-12

1997-12-02

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2505592, 25055926, 25055929, 355311, 358488, H01L 2700

Patent

active

056939337

ABSTRACT:
A document reading device comprises a plurality of distance sensors, an original document size detection board, and a main unit control board. The plurality of distance sensors measure distance as for each certain position of an original document table. The original document size detection board comprises an EEPROM for storing a threshold value and an original document size detection CPU 1 for implementing a program for original document size detection. The original document size detection board judges the presence or the absence of an original document at each preset position of an original document table by comparing each threshold value from the plurality of distance sensors with the threshold value, detects the size of an original document according to the judging result from the original document size detection board, and outputs data indicative of the detected original document size. The main unit control CPU 2 implements a program for original document reading control.

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patent: 4954846 (1990-09-01), Matsuo et al.
patent: 5010371 (1991-04-01), Matsuo et al.
patent: 5036354 (1991-07-01), Miyamoto
patent: 5072259 (1991-12-01), Ikeda
patent: 5223904 (1993-06-01), Umezawa

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