Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-12-04
2011-10-04
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S766000
Reexamination Certificate
active
08031409
ABSTRACT:
An imaging lens includes at least a first positive lens group, a first negative lens group that moves during focusing, a second positive lens group that moves during focusing, a second negative lens group that can move in a direction substantially vertical to an optical axis, and a positive lens group, which are disposed in order from an object, wherein a condition of an expression, which is 2.0<(−f4)/d34<20.8, is satisfied, where f4 is a focal length of the second negative lens group (vibration proof group) that can move in a direction substantially vertical to the optical axis, and d34 is an air distance on the optical axis upon focusing on infinity, between a lens surface disposed closest to an image of a lens group (the second positive lens group in the case of this embodiment) which is disposed to an object side of the second negative lens group that can move in a direction substantially vertical to the optical axis, and a lens surface disposed closest to the object of the negative lens group that can move in a direction substantially vertical to the optical axis.
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Collins Darryl J
Miles & Stockbridge P.C.
Nikon Corporation
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