Patent ID: 7333217

Claim:
A system for detecting position deviations of an object having a curved surface, comprising: a first lens having a first optical axis and a principal plane, the first lens positioned to receive and transmit therethrough light reflected from the curved surface; a first body having at least a portion thereof that is substantially transparent to light, the first body being positioned proximate the first lens and configured such that the first optical axis extends therethrough, whereby at least a portion of the reflected light passes through the substantially transparent portion of the first body; an image formation device positioned to receive the reflected light transmitted through the first lens and the substantially transparent portion of the first body and operable to form a reflected image based on the received reflected light; and a moveable support configured to support the object and operable to move the object in at least a first axis that is parallel to the first optical axis, whereby the object is moveable between at least two positions relative to the principal plane of the first lens.