Patent ID: 7306334
Filing Date: 2007-12-11
Classification: B24B,G02C

Abstract:
1. A method for positioning an optical element on a mounting device, said method comprising the steps of: a.) providing an imaging camera in imaging relation to the optical element when the optical element is supported on the mounting device; b.) providing an output signal from said imaging camera, said output signal representing an image of a pair of mutually spaced, generally punctiform, engravings present on the optical element at respective locations lying interiorly of a peripheral edge portion of the optical element; c.) evaluating said output signal to determine a positional relationship between a current position of the optical element with respect to the mounting device and a desired position of the optical element with respect to the mounting device based on information derived from said output signal without reliance upon information relating to any reference for the optical element other than said pair of mutually spaced, generally punctiform, engravings, and d.) positioning the optical element with respect to the mounting device based on said positional relationship as determined as a result of said evaluating step.