Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-07-10
2007-07-10
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S557000, C396S055000
Reexamination Certificate
active
11446319
ABSTRACT:
Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.
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Mizuguchi Keiko
Shibayama Atsushi
Miles & Stockbridge P.C.
Nikon Corporation
Schwartz Jordan M.
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