Zoom lens

Details Zoom lens Zoom lens

2006-09-12

2006-09-12

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07106522

ABSTRACT:
The present invention is directed to a zoom lens which includes, in order from an object side: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power. While zooming from a wide-angle position to a telephoto position, the distance between the third lens group and an image side is greater at the wide-angle position than at the telephoto position. The zoom lens satisfies the following conditional expression:1.0≤LIIfW⁢fT≤1.5where fWdenotes the total focal length at the wide-angle position; fTdenotes the total focal length at the telephoto position; and LIIdenotes the moving distance of the second lens group from the wide-angle position to the telephoto position.

REFERENCES:
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patent: 2003/0117716 (2003-06-01), Sekita
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patent: 11-084243 (1999-03-01), None
patent: 2002-14284 (2002-01-01), None

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