Zoom lens

Details Zoom lens Zoom lens

2007-08-03

2008-07-29

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

07405885

ABSTRACT:
A zoom lens includes a first lens group with a negative refractive power and a second lens group with a positive refractive power. The first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence and refractive powers thereof are negative, negative, negative and positive respectively. The first and second lenses are meniscus lenses and two surfaces of the second lens are aspheric surfaces. The third lens is a biconcave lens and the fourth lens is a biconvex lens. The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence and refractive powers thereof are positive, positive, positive, negative and positive respectively. A cemented doublet lens is composed of the seventh and eighth lenses. The ninth lens is a biconvex lens.

REFERENCES:
patent: 4189212 (1980-02-01), Mizutani et al.
patent: 4380375 (1983-04-01), Mogami
patent: 4484799 (1984-11-01), Doi et al.
patent: 5076677 (1991-12-01), Sato
patent: 6809882 (2004-10-01), Takatsuki

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