Zoom lens

Details Zoom lens Zoom lens

2006-03-24

2008-11-11

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

07450317

ABSTRACT:
A zoom lens includes a first lens group having a negative refracting power, a second lens group having a positive refracting power and being aligned closer to an image surface than the first lens group, and a third lens group aligned closer to the image surface than the second lens group. The distance between first and second lens groups is shortened and the distance between second and third lens groups is lengthened as the zoom lens performs zooming action from a wide angle position to a telephoto position.

REFERENCES:
patent: 6124984 (2000-09-01), Shibayama et al.
patent: 6614599 (2003-09-01), Watanabe
patent: 1282881 (2001-02-01), None
patent: 2004295075 (2004-10-01), None

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