Telephoto lens

Details Telephoto lens Telephoto lens

2007-07-03

2007-07-03

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Telephoto

C359S689000, C359S690000

Reexamination Certificate

active

11367393

ABSTRACT:
A telephoto lens is provided and has three lens groups as a whole. A first lens group includes a first positive lens having a meniscus shape and having a convex surface on an object side thereof, a negative lens arranged on an image side of the first positive lens and having a concave surface on the image side thereof, and a second positive lens arranged on the image side of the negative lens and having a convex surface on the object side thereof. Further, the following Condition Equations are satisfied. ν11designates an Abbe number of the first positive lens, ν12designates an Abbe number of the negative lens, ν13designates an Abbe number of the second positive lens.in-line-formulae description="In-line Formulae" end="lead"?35<ν11<50  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ν12<45  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?75<ν13  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ν12<ν11  (4)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 4534626 (1985-08-01), Mihara
patent: 2002/0041452 (2002-04-01), Ozaki
patent: 2002-55275 (2002-02-01), None
patent: 2004-226648 (2004-08-01), None

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