Objective lens

Details Objective lens Objective lens

1988-09-09

1989-06-06

Corbin, John K.

350450, G02B 920

Patent

active

048366650

ABSTRACT:
An objective lens having a stop provided most adjacent to the image side comprises, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave lens, a third lens which is a biconvex lens, and a fourth lens which is a negative meniscus lens having its convex surface facing the image side and is joined to the third lens and formed into a compositely positive cemented lens. The objective lens satisfies the following conditions:

REFERENCES:
patent: 3953112 (1976-04-01), Imai
patent: 4192579 (1980-03-01), Hyakumura
patent: 4606615 (1986-08-01), Wakamiya
patent: 4676607 (1987-06-01), Wakamiya

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