Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-02-15
2005-02-15
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
06856467
ABSTRACT:
The invention has for its object to use a zoom system that comprises a reduced number of lens elements, is compact and simplified, and has high image-formation capability, thereby achieving thorough size reductions in video cameras or digital cameras. A zoom lens for use on an image pickup system comprises a first lens group G1negative power comprising an aspheric negative lens element and a positive lens element, a second lens group G2comprising a positive single lens element, a positive doublet wherein a positive and a negative lens element are cemented together in this order and which is in a meniscus form convex toward an object side of the zoom lens and a positive single lens element, wherein two or more surfaces except the cementing surface of the doublet are each defined by an aspheric surface, and a third lens group G3comprising one positive lens component. For zooming from the wide-angle end to the telephoto end of the zoom lens, the second lens group G2moves only toward the object side of the zoom lens, and the third lens group G3moves in a locus different from that of the second lens group G2. For focusing, the third lens group G3moves. Condition (1) for the shape factor of the object side-positive lens element in the second lens group G2and condition (2) for the magnification of the second lens group G2are satisfied.
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Kenyon & Kenyon
Olympus Corporation
Spector David N.
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