Zoom lens system

Details Zoom lens system Zoom lens system

2006-08-15

2006-08-15

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S685000, C359S686000, C359S714000, C359S757000, C359S763000, C359S764000

Reexamination Certificate

active

07092169

ABSTRACT:
A zoom lens system, in sequence from an object side to an image side, includes a first lens group having positive refractive power and fixed for gathering incoming light; a second lens group having negative refractive power for changing a focal length of the zoom lens system; a third lens group having positive refractive power and made stationary; a fourth lens group having positive refractive power and movable for compensating for a fluctuation of an image plane position; and a fifth lens group having positive refractive power and movable for focusing purpose. During zooming from a wide-angle end to a telephoto end, the second and fourth lens groups are moved independently toward the third lens group in such a manner that spacing between the first lens group and the second lens group increases and spacing between the third lens group and the fourth lens group decreases.

REFERENCES:
patent: 5185676 (1993-02-01), Arimoto
patent: 6061186 (2000-05-01), Nishio
patent: 6718132 (2004-04-01), Nishina

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