Zoom lens and information device

Details Zoom lens and information device Zoom lens and information device

2008-04-14

2009-06-30

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07554746

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, X1 and 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. 11/873,078, filed Oct. 16, 2007, Ohashi.
U.S. Appl. No. 12/102,257, filed Apr. 14, 2008, Ohashi.

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