Zoom lens

Details Zoom lens Zoom lens

2008-04-22

2008-04-22

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S682000, C359S683000, C359S691000, C359S713000, C359S717000, C359S749000, C359S753000, C359S761000, C359S793000

Reexamination Certificate

active

11116016

ABSTRACT:
A zoom lens includes, in sequence from the object side: a first lens group with an overall negative refractive power; and a second lens group with an overall positive refractive power. A zoom factor changes by moving the second lens group. Focal adjustments are made by moving the first lens group accompanied by the change of the zoom factor made by the movement of the second lens group. The first lens group includes a first lens having a negative refractive power and a second lens having a positive refractive power. The second lens group includes a third lens having a positive refractive power, a fourth lens with a positive refractive power and a fifth lens with a negative refractive power bonded together, and a sixth lens with a positive refractive power. The bonded lenses form a meniscus shape with a convex surface facing the object side. The resulting lens is short in length, compact, thin, and suitable for digital still cameras.

REFERENCES:
patent: 5696633 (1997-12-01), Nakajima
patent: 6487024 (2002-11-01), Sato
patent: 6618558 (2003-09-01), Enomoto
patent: 2002/0149857 (2002-10-01), Nobe
patent: 2003/0138245 (2003-07-01), Watanabe
patent: 2003/0165019 (2003-09-01), Yamamoto
patent: 2005/0063070 (2005-03-01), Watanabe et al.
patent: 2000-035537 (2000-02-01), None
patent: 2003-307676 (2003-10-01), None
Examination Report for European Patent Application No. 05 009 290.7 dated Dec. 15, 2005.

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