Patent ID: 7701562
Filing Date: 2010-04-20
Classification: G01B,G01M

Abstract:
1. A method of measuring a front surface profile and a back surface profile of a lens, the lens having a first measuring surface and a second measuring surface at a front surface and a back surface within a contour, the front surface profile and the back surface profile of the lens being measured while relatively moving the lens and a probe, the method comprising: mounting the lens in such a posture that the first measuring surface of the lens is measurable by the probe; first measuring the contour of the lens while relatively moving the lens and the probe with the posture of the lens set in the mounting of the lens being maintained; measuring a profile of the first measuring surface of the lens while relatively moving the lens and the probe with the posture of the lens set in the mounting of the lens being maintained; reversing the target object to such a posture that the second measuring surface of the lens is measurable by the probe; second measuring the contour of the lens while relatively moving the lens and the probe with the posture of the lens set in the reversing of the lens being maintained; obtaining a measurement position of the second measuring surface by comparing first contour data obtained through the first measuring of the contour with second contour data obtained through the second measuring of the contour, the measurement position of the second measuring surface corresponding to a measurement position of the first measuring surface at which the measuring of the first measuring surface is conducted; measuring a profile of the second measuring surface of the lens along the obtained measurement position of the second measuring surface while relatively moving the lens and the probe with the posture of the lens set in the reversing of the lens being maintained; and analyzing the surface profiles of the lens by obtaining a displacement and inclination of an optical axis of the first measuring surface and the second measuring surface of the lens based on the first contour data obtained in the first measuring and the second contour data obtained in the second measuring.