Optical sensor including a first and second converging optical s

Details Optical sensor including a first and second converging optical s Optical sensor including a first and second converging optical s

1997-08-18

1999-07-27

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250236, 250216, 359 17, G01J 120

Patent

active

059294361

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: 5479274 (1995-12-01), Baba
patent: 5594242 (1997-01-01), Konishi et al.
patent: 5729024 (1998-03-01), Baba et al.

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