Patent ID: 9205576
Filing Date: 2015-12-08
Classification: B29C,G01B,G02B

Abstract:
1. A measuring apparatus comprising: an imaging optical system configured to form an image of an object to be measured; and an imaging section including a transmissive member which is arranged in the vicinity of an image plane of the imaging optical system to be inclined with respect to an optical axis of the imaging optical system; wherein the imaging optical system includes a first optical member which is non-coaxial with respect to the optical axis, and which has a surface that is rotationally symmetric about a first symmetry axis, wherein the transmissive member is arranged along the image plane, and is a flat member via which a light flux condensed by the imaging optical system is transmissive, wherein the first symmetry axis with respect to the optical axis is inclined in a plane that includes the optical axis and a first axis connecting a first point in the object plane and a second point in the image plane conjugate with the first point in the object plane, and that is perpendicular to an intersection line between a plane including the object plane and a plane including the imaging plane, and wherein the first optical member is inclined in an opposite direction to a direction in which the transmissive member is inclined with respect to the optical axis.