Patent ID: 7916398

Claim:
A high performance front objective lens system for use in a video inspection apparatus of the type in which an image of an object in an imaging plane is projected to a video camera, the system comprising: a first lens set comprising lens elements forming a doublet; a second lens set in spaced relationship to the first lens set and intermediate the first lens set and the imaging plane, the second lens set comprising lens elements forming a doublet and an adjacent lens element; and wherein each of said lens have first and second optical lens surfaces that are, respectively, more distant from the imaging plane and less distant from the imaging plane, and wherein at least one of: the lens surfaces of the doublet of the second lens set are all bowed away from the imaging plane, the lens surfaces of the second lens set are all bowed away from the imaging plane, and the lens surfaces of both lens sets are all bowed away from the imaging plane except for lens surfaces intermediate the lens elements of the first lens set.