Patent ID: 7075046
Filing Date: 2006-07-11
Classification: G02B

Abstract:
1. A system for referencing an objective lens to a desired plane of focus, said system comprising: (a) an objective lens having a center axis; (b) an energy source for directing a first energy of a first wavelength so as to intercept said objective lens at a first location that is radially spaced at a second distance from said center axis, said first energy being directed by said objective lens to a first surface of a dichroic element positioned a predetermined first distance from the desired plane of focus, said first energy ten reflecting off said first surface and transmitting through said objective lens at a second location that is different from said first location at a third distance from said center axis; and (c) a detector operatively configured to detect said first energy after being transmitted through said objective lens at said second location, said detector providing information relating to said second distance relative to said first distance.