Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-04-28
2008-09-02
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
07420745
ABSTRACT:
A zoom lens includes, in order from an object side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, a fourth lens group having a positive refracting power, and the first lens group being moved to the object side during changing a magnification from a wide angle end to a telephoto end, and the fourth lens group comprises one positive lens, both surfaces of the positive lens are an aspheric surface, respectively, and total displacement of the first lens group during changing the magnification from the wide angle end to the telephoto end, X1and an focal length of an entire system at the telephoto end, fT satisfy the following condition: (1) 0.30<X1/fT<0.85.
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U.S. Appl. No. 11/762,435, filed Jun. 13, 2007, Ohashi et al.
Choi William C
Ricoh & Company, Ltd.
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