Optical: systems and elements – Lens – With light limiting or controlling means
Patent
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".
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patent: 5296971 (1994-03-01), Mori
Ogawa Ryota
Yamamoto Chikara
Asahi Kogaku Kogyo Kabushiki Kaisha
Epps Georgia Y.
Lester Evelyn A.
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