Telecentric projection lens system

Details Telecentric projection lens system Telecentric projection lens system

1989-07-24

1990-04-03

Sugarman, Scott J.

350464, 350465, 350466, G02B 960, G02B 962

Patent

active

049135406

ABSTRACT:
A wide-angle telecentric projection lens system for use in enlarged projection at a magnification of about 15-20, that has a brightness of about F.sub.NO 1:7, and which covers a wide field of up to about 25 degrees in terms of the half viewing angle. This is attained by a telecentric projection lens system that comprises, in order from the screen side to the chart side, a first lens group composed of a single positive lens element, a second lens group composed of either a single negative lens element or a positive lens cemented to a negative lens, and a third lens group composed of both a negative lens cemented to a positive lens and two or more positive lens elements, which lens system satisfies the following conditions (1) and (2):

REFERENCES:
patent: 3947094 (1976-03-01), Ikemori
patent: 4441792 (1984-04-01), Tateoka

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