Patent ID: 6292306
Filing Date: 2001-09-18
Classification: G02B

Abstract:
In a video inspection apparatus of the type including a video camera mounted on a slide above a work support for reciprocation vertically by the slide toward and away from an object positioned for inspection on said support, a telecentric zoom lens system mounted on the slide between the said camera and work support, and comprisinga lens barrel having in one end thereof an objective lens assembly positioned to have the front focal point thereof registering with an inspected object on the support, thereby to project an image of the inspected object coaxially of said barrel toward the opposite end thereof,an adjustable iris diaphragm mounted in said barrel rearwardly of said objective lens assembly and having therein an adjustable telecentric stop opening disposed coaxially of said barrel and registering with the rear focal point of said objective lens assembly,means in said barrel for projecting said image of an object from said stop opening to a first image plane positioned adjacent said opposite end of said barrel, anda zoom lens housing having an image inlet end connected to said opposite end of said lens barrel coaxially thereof, and having an image outlet end connected to said camera to transmit said image of an inspected object to an image plane in said camera,said housing having therein a plurality of movable zoom lens groups for projecting a magnified image of said object from said first image plane to said image plane in said camera, andsaid zoom lens groups being adjustable axially of said housing to alter the magnification of said image projected to said camera.