Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1989-09-06

1991-04-09

Sugarman, Scott J.

350414, 350415, G02B 1318, G02B 2102

Patent

active

050059572

ABSTRACT:
An objective lens system for endoscopes comprising, in the order from the object side, a first lens unit having negative refractive power and a second lens unit having positive refractive power, said first lens unit comprising a surface which is concave on the image side and satisfies the following condition (1), and an aspherical surface which is arranged on the object side and satisfies the following condition (2) at 50% or more of the effective area thereof. ##EQU1##

REFERENCES:
patent: 4662725 (1987-05-01), Nisioka
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4806001 (1989-02-01), Okabe et al.

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