Patent ID: 9383191
Filing Date: 2016-07-05
CPC Classification: G01B

Claim Text:
1. An outer dimension measuring apparatus comprising: a light source configured to emit light; an optical system configured to focus the light emitted from the light source onto an optical axis; a reflector configured to reflect the light focused by the optical system, the reflector comprising: a detector configured to detect an intensity of the reflected light according to a focus position on the optical axis of the light passing through the optical system; and a calculator configured to calculate an outer dimension of a measured object using a first focus position, a second focus position, and a position of the reflector on the optical axis, the first focus position lying on the optical axis where a peak in reflected light intensity is detected by the detector for light reflected by a first surface, which is a surface of the measured object closest to the optical system, and the second focus position lying on the optical axis where a peak in reflected light intensity is detected by the detector for light that has been reflected by the reflector and emitted at a second surface, which is a surface of the measured object closest to the reflector, and reflected by the second surface.