Zoom lens

Details Zoom lens Zoom lens

2011-01-04

2011-01-04

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S676000

Reexamination Certificate

active

07864442

ABSTRACT:
A zoom lens includes, in order from an object side thereof: a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a negative refractive power; and a fifth lens group with a positive refractive power. A power of the zoom lens is varied by changing intervals between neighboring lens groups in the first through fifth lens groups. The second lens group includes a cemented lens consisting of one positive lens and one negative lens, and the third lens group includes a cemented lens consisting of two positive lenses and one negative lens.

REFERENCES:
patent: 7450314 (2008-11-01), Satori et al.
patent: 7719773 (2010-05-01), Atsuumi et al.
patent: 2008/0304161 (2008-12-01), Souma
patent: 2008/0304167 (2008-12-01), Souma
patent: 2001-033703 (2001-02-01), None
patent: 2005-189670 (2005-07-01), None

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