Position detecting apparatus and position detecting method

Details Position detecting apparatus and position detecting method Position detecting apparatus and position detecting method

2007-09-05

2009-02-24

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

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

C250S559290

Reexamination Certificate

active

07495248

ABSTRACT:
A position detecting apparatus includes a first illuminating unit that radiates light onto a substrate in a direction substantially parallel to the front and the rear surfaces of the substrate from the direction of a lateral face of the substrate; a second illuminating unit that radiates light onto the front surface of the substrate, in a direction substantially perpendicular to the front surface of the substrate; an image pickup unit that takes an image of the substrate from a rear surface side thereof; and an edge-position detecting unit that detects an edge position of the substrate, based on a first image that is taken while the light is being radiated from the first illuminating unit and a second image that is taken while the light is being radiated from the second illuminating unit, respectively.

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