Endoscope objective lens

Details Endoscope objective lens Endoscope objective lens

1994-07-05

1996-05-07

Epps, Georgia Y.

Optical: systems and elements

Lens

With light limiting or controlling means

G02B 900

Patent

active

055152082

ABSTRACT:
An endoscope objective lens having a first lens group of negative power, a diaphragm, a second lens group of positive power consisting of first and second lenses, and a third lens group of positive power consisting of a positive lens cemented to a negative lens. The first lens group, diaphragm, first and second lenses of the second lens group, and positive and negative lenses of the third lens group are arranged in this order from an object side. A lens surface on the image side of the first lens has a radius of curvature ri which satisfies the relationship "-0.25.ltoreq.1/ri<0".

REFERENCES:
patent: 2671380 (1954-03-01), Baker
patent: 2720140 (1955-10-01), Lange
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4979808 (1990-12-01), Yamagata et al.
patent: 5071235 (1991-12-01), Mori et al.
patent: 5087988 (1992-02-01), Nakayama
patent: 5119238 (1992-06-01), Igarashi
patent: 5296971 (1994-03-01), Mori

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