Projection lens with long working distance

Details Projection lens with long working distance Projection lens with long working distance

1981-05-05

1984-01-17

Corbin, John K.

350464, G02B 962, G02B 964

Patent

active

044261365

ABSTRACT:
A projection lens with a long working distance for projecting a magnified image of an object comprises, in the order from the image side, a diverging first lens group containing a positive lens element and a negative lens element, a diverging second lens group having a negative meniscus lens element with a convex surface thereof facing toward the image side, a converging third lens group containing a positive meniscus lens element whose concave surface faces toward the image side, a converging fourth lens group having a positive lens composed of mutually cemented negative lens element and positive lens element, and a converging fifth lens group. The projection lens of an elevated magnification has a working distance from twice to five times longer than the focal length and is bright with a limited number of lens components.

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