Patent ID: 7150528

Claim:
An apparatus for positioning a semi-finished product of a future spectacle lens with respect to a mounting device, said apparatus comprising: a.) an imaging camera disposed in imaging relation to the semi-finished product of a future spectacle lens when the semi-finished product of a future spectacle lens is supported on the mounting device, said imaging camera providing an output signal representing an image of a pair of mutually-spaced, generally punctiform, engravings present on the semi-finished product of a future spectacle lens at respective locations lying interiorly of a peripheral edge portion of the semi-finished product of a future spectacle lens; b.) processing means in communication with said imaging camera for receiving and evaluating said output signal to determine the positional relationship between a current position of said semi-finished product of a future spectacle lens with respect to the mounting device and a desired position of said semi-finished product of a future spectacle lens with respect to the mounting device based on information derived from said output signal without reliance upon information relating to any mark on the semi-finished product of a future spectacle lens other than said pair of mutually-spaced, generally punctiform, engravings; and c.) indicating means in communication with said processing means for indicating said positional relationship as determined by said processing means.