Patent ID: 8294905
Filing Date: 2012-10-23
Classification: G01B

Abstract:
1. An optical measurement device comprising: a light projecting portion configured to project an irradiation light towards a measuring target object existing in a measurement region, a light receiving portion configured to (i) receive a reflected light of both a diffuse reflected light and a specular reflected light generated when the irradiation light is reflected at a surface of the measuring target object from a direction in which a position of a reflected light image obtained according to a displacement of the surface of the measuring target object changes, and (ii) to acquire an image of the reflected light image; and a measurement processing portion configured to measure the displacement of the surface of the measuring target object that reflects the irradiation light based on the image acquired by the light receiving portion; wherein the light receiving portion includes: wherein the light projecting portion is configured to project the irradiation light to converge a component at a position in the direction of the center optical axis of the image-forming portion where the light shielding portion exists when the irradiation light is specular reflected at the measuring target object existing in the measurement region, the component being the specular reflected light and parallel to the predetermined plane.