Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-03-02
2009-08-11
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S683000
Reexamination Certificate
active
07573649
ABSTRACT:
The present invention is directed to a high variable power zoom lens that ensures a flange-back or a backfocal distance required for typical 35-mm film cameras while keeping an angle of view sufficient to cover the wide-angle for an APS-size imaging plane dimensioned smaller than 35 mm. The high variable power zoom lens has the first lens group L1of positive refractivity closest to the subject, the second lens group L2of negative refractivity second closest to the subject, the third lens group L3of positive refractivity, and the fourth lens group L4of positive refractivity farthest from the subject, and the zoom lens satisfies the requirements 0.6≦|f2|/fW≦0.73 where f2is the focal length of the second lens group and fW is the focal length of the entire optics moved to the wide-angle end, and also satisfies the requirements 2.2≦f3/fW≦3.7 where f3is the focal length of the third lens group.
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Jacobson & Holman PLLC
Sugarman Scott J
Tamron Co., Ltd.
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