Endoscope objective lens system

Details Endoscope objective lens system Endoscope objective lens system

1988-05-25

1990-12-25

Sugarman, Scott J.

G02B 900

Patent

active

049798081

ABSTRACT:
An endoscope objective lens system is disclosed in which the lens disposed just in front of a diaphragm stop in the lens system is a divergent lens having a concave surface on the image side and the convergent lens disposed immediately after the diaphragm stop is in the form of a convergent lens unit comprising, in order from the object side, a first optical element and a second optical element. The two optical elements are made of optical materials having different Abbe numbers (.nu. values) in such a way that the relation .nu..sub.2 <.nu..sub.3 is satisfied, where .nu..sub.2 is the Abbe number of the first optical element and .nu..sub.3 is the Abbe number of the second optical element.

REFERENCES:
patent: 4403837 (1983-09-01), Nakahashi
patent: 4493537 (1985-01-01), Nakahashi
patent: 4662725 (1987-05-01), Nisioka
patent: 4674844 (1987-06-01), Nishioka et al.

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