Wide angle reading lens system

Details Wide angle reading lens system Wide angle reading lens system

1987-09-04

1988-11-01

Corbin, John K.

G02B 936

Patent

active

047814497

ABSTRACT:
A wide-angle reading lens system is disclosed which comprises, in order from the object side, a first lens element which is a negative meniscus lens having its convex surface directed toward the object side, a second lens element which is a positive lens having a strong convex surface directed toward the object side, a third lens element which is a negative lens, and a fourth lens element which is a positive lens having an strong convex surface directed toward the image side, said lens system satisfying the following conditions:

REFERENCES:
patent: 4591234 (1986-05-01), Hamanishi

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