Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-03-27
2007-03-27
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
11438126
ABSTRACT:
A zoom lens system includes four lens units having, from an object to an image side, negative, positive, negative and positive optical powers, respectively. During zooming, the intervals between the first and second lens units, and also the third and fourth lens units at the telephoto end are smaller than that at the wide angle end. Also, an interval the second and third lens units at the telephoto end is larger than that at the wide angle end. A zoom ratio is about 2.5 to 4.0. The following condition is satisfied: 2.2<bfw/H<3.0, where bfw represents a back focus at the wide angle end, and H represents a maximum image height.
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Morgan & Finnegan , LLP
Schwartz Jordan M.
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