Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-01-23
2007-01-23
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
Reexamination Certificate
active
11357976
ABSTRACT:
A zoom lens, comprising: a first lens group (I) having positive refractive power, a second lens group (II) having negative refractive power, an aperture stop (S), a third lens group (III) having positive refractive power and a fourth lens group (IV) having positive refractive power, wherein the first and third lens groups (I, III) move toward the object side according to a change in magnification power as the zoom lens shifts from a wide-angle position to a telephoto position, the aperture stop (S) moves independently from the lens groups (I, III), and a following formula is satisfied: 0.30<X1/fT<0.85 (1), where X1 represents a total amount of a movement of the first lens group in accordance with a change in magnification power and fT represents a focal length of an entire optical system of the zoom lens in the telephoto position.
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Hasan M.
Sugarman Scott J.
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