Patent ID: 6490085
Filing Date: 2002-12-03
Classification: G02B

Abstract:
A symmetrical relay lens system for transmitting an image through the lens system, comprising:a first imaging part and a second imaging part optically aligned with said first imaging part, each of said first and second imaging parts comprising: an elongated concavo-convex rod lens formed of crown glass and having at longitudinally opposite ends a first convex end surface and a second concave end surface; a concavo-convex flint lens axially aligned with and affixed in surface-to-surface relation to the convex end surface of the rod lens; and an achromatic lens comprising a positive lens element and a negative lens element affixed together in surface-to-surface, optically-aligned relation and disposed adjacent said second concave end surface of the rod lens and in optically-aligned relation to said rod lens, wherein said positive and negative lens elements satisfy the relationship nx/ny=vx/vy wherein n is a refraction index of each lens element x, y and v is an Abbe number of each lens element x, y; wherein said first and second imaging parts are disposed such that the flint lens of said first imaging part is disposed in substantially confronting opposition to the flint lens of said second imaging part.