Patent ID: 7253910
Filing Date: 2007-08-07
Classification: G01B

Abstract:
1. An optical measuring device, comprising: a projector means operative to use a collimated beam derived from a beam emitted from a light-emitting element to repeatedly scan a scan region in which a work to be measured locates; a photoreceptor element operative to receive a beam transmitted through said scan region to provide a scanned signal; a binarized signal generator means configured to binarize said scanned signal with a plurality of different threshold values to generate a plurality of binarized signals; an arithmetic means operative to calculate on the basis of said binarized signals a measured value associated with said work to be measured; a decision means operative to compare a plurality of measured values calculated at said arithmetic means on the basis of said binarized signals to determine whether an abnormality arises on an optical path of said beam from said light-emitting element to said photoreceptor element; and a notice means operative to notice said abnormality if said decision means determines that said abnormality arises.