Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1997-08-18
1998-10-06
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
358488, 250236, G01N 2147, H01J 314
Patent
active
058180621
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: 4680806 (1987-07-01), Bolza-Schunemann
patent: 5479274 (1995-12-01), Baba
patent: 5510908 (1996-04-01), Watanabe et al.
patent: 5729024 (1998-05-01), Baba et al.
Aoki Sumiaki
Baba Nobuyuki
Kudo Koichi
Murai Toshiharu
Allen Stephone B.
Ricoh & Company, Ltd.
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