Patent ID: 7859687
Filing Date: 2010-12-28
Classification: G01B,G03G

Abstract:
1. A detection apparatus, comprising: a light source unit; an illumination optical system for illuminating a subject surface with a light flux emitted from the light source unit; an imaging optical system for causing the light flux reflected on the subject surface to form an image as a line image on an imaging surface; and a light detection unit disposed on the imaging surface, the light detection unit having multiple sensors arranged one-dimensionally or two-dimensionally, the detection apparatus detecting the height information of the subject surface in an optical axis direction of the illumination optical system based on light information detected by the light detection unit, wherein: the light detection unit has a light detection surface thereof positioned on an optical axis of the imaging optical system; and the light detection surface of the light detection unit is positioned in a plane rotated about a rotational axis, the rotational axis being an axis which is perpendicular to an optical axis of an optical element positioned optically closest to the light detection unit among optical elements constituting the imaging optical system, and is perpendicular to the line image to be formed by the imaging optical system.