Patent ID: 6914728
Filing Date: 2005-07-05
Classification: G02B

Abstract:
1. An optical arrangement for a microscope objective comprising in order and in the absence of one or more intervening lenses: a first lens having a positive power; a second lens having a negative power; a third lens having a positive power; a fourth lens having a positive power; and, a fifth lens having a positive power wherein the absolute value of a radius of curvature of the surface of said fifth lens proximate to an object plane is less than the absolute value of a radius of curvature of the surface of said fifth lens distal to said object plane; wherein the gap between said first lens and said second lens is sufficient to increase the ray height of a light ray entering said first lens from the ray height of said light ray exiting said second lens, and; wherein said optical arrangement is positioned on the opposite of said object plane than a source of said light ray.