Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2011-01-11
2011-01-11
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S682000
Reexamination Certificate
active
07869134
ABSTRACT:
Provided is a microminiaturized zoom optical system capable of sufficiently correcting aberration. The zoom optical system (100) includes a first lens group (101) having a negative optical power, a second lens group (102) having a positive optical power, and a third lens group (103) having a positive or negative optical power in this order from the object side. The zoom optical system is configured in such a manner that the interval between the first lens group (101) and the second lens group (102) is decreased in zooming from the wide angle end to the telephoto end. A positive lens element in the third lens group (103) or in a lens group closer to the image side than the third lens group (103) satisfies the following conditional expression:in-line-formulae description="In-line Formulae" end="lead"?vp<40in-line-formulae description="In-line Formulae" end="tail"?where vp is the minimum value of the Abbe number of the positive lens element.
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Matsusaka Keiji
Ohzawa Soh
Konica Minolta Opto Inc.
Sidley Austin LLP
Spector David N
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