Patent ID: 6177986
Filing Date: 2001-01-23
Classification: G01M

Abstract:
Method of testing a lens having a plurality of field angles characteristic of the magnification of said lens, comprising the steps of:providing a platform for holding at least one test pattern;providing means to illuminate one of said at least one test pattern;providing a reflecting surface capable of rotating and translating movements about an optical path defined by a beam of light having a predetermined optical path, said beam of light having been converted to a collimated array of light rays by a collimating lens arranged in said optical path between said at least one test pattern and said reflecting surface;illuminating one of said at least one test pattern with a beam of light, said beam of light passing through said at least one test pattern and then said collimating lens thereby forming a collimated array of light rays; and,reflecting said collimated array of light rays off said reflecting surface arranged at a first position and then directing said collimated array of light rays through said lens at a first field angle to form a first image at a first image plane;translating and rotating said reflecting surface along said optical path to a second position; and,reflecting said collimated array of light rays off said reflecting surface and then directing said collimated array of light rays through said lens at a second field angle to form a second image at a second image plane.