Optical image scanning apparatus detecting sheet size and displa

Details Optical image scanning apparatus detecting sheet size and displa Optical image scanning apparatus detecting sheet size and displa

1995-07-06

1997-03-11

Henry, Jon W.

Radiant energy

Photocells; circuits and apparatus

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

250236, 359 17, 359197, 399216, G01N 2147, H01J 314, G02B 2608, G02B 532

Patent

active

056104073

ABSTRACT:
An image scanning apparatus can obtain, using a simple optical detection system, original sheet information including size and displacement information of an original sheet before an image scanning operation starts. The image scanning apparatus comprises a single beam emitting unit for emitting a coherent first beam. A deflecting unit deflects the first beam so that the first beam traces a predetermined scan line on a plane including a surface of the original sheet. A second beam is generated by reflection of the first beam at the surface of the original, and the second beam is input to the sensing unit via the deflecting unit. The original sheet information is obtained in accordance with the detection of a sharp change in the intensity of the second beam received by the sensing unit with reference to the scanning position of the first beam.

REFERENCES:
patent: 4025796 (1977-05-01), Erdmann
patent: 5479274 (1995-12-01), Baba

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