Original edge detecting system and optical sensor

Details Original edge detecting system and optical sensor Original edge detecting system and optical sensor

1996-05-01

1998-03-17

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250236, 359 17, G01N 2147, H01J 314, G02B 2608, G02B 532

Patent

active

057290245

ABSTRACT:
An original placement table is provided, on which an original sheet is placed. An original scanning device causes a light beam to scan the original sheet placed on the original placement table. A light receiving device receives a light beam which has been reflected by the original sheet placed on the original placement table after being emitted by the original scanning device. An original edge determining device monitors light intensity of the light beam received by the light receiving device. The original edge determining device determines that the light beam currently being received by the light receiving device is the light beam reflected by an edge of the original sheet placed on the original placement table when a significant variation is detected in the light intensity either for the first time or for the last time in one scanning operation of the original scanning device.

REFERENCES:
patent: 5214294 (1993-05-01), Toyofuku
patent: 5252991 (1993-10-01), Storlie et al.
patent: 5479274 (1995-12-01), Baba
patent: 5610407 (1997-03-01), Baba

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