Zoom lens and image pickup device

Details Zoom lens and image pickup device Zoom lens and image pickup device

2006-08-15

2008-11-18

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07453649

ABSTRACT:
A zoom lens includes 10 or less lens elements and having a zoom ratio of more than 20×, said zoom lens having first, second, third, and fourth groups of lens elements placed in turn from object side to image side; wherein the first group of lens elements has positive refractive power and is fixed in position during zooming; wherein the second group of lens elements has negative refractive power and is moved in position during zooming; wherein the third group of lens elements has positive refractive power, includes at least one aspheric surface, and is fixed in position during zooming; wherein the fourth group of lens elements has positive refractive power, includes at least one aspheric surface, corrects variations in image surface position during zooming, and performs focusing; and wherein the zoom lens satisfies the following conditional expression (1):7.8<dzfw<8.8(1)where dz is the movable distance of the second group of lens elements to perform zooming and fw is the focal distance of the whole lens system at a wide angle end.

REFERENCES:
patent: 7245442 (2007-07-01), Ohtake
patent: 2005/0088756 (2005-04-01), Yamada
patent: 2005/0190458 (2005-09-01), Hamano et al.
patent: 03-033710 (1991-02-01), None
patent: 06-060971 (1994-08-01), None
patent: 08-005913 (1996-01-01), None
patent: 09-304699 (1997-11-01), None
European Search Report, Application No. 06017247.5-2217, Dec. 7, 2006.

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