Zoom lens system with vibration reduction

Details Zoom lens system with vibration reduction Zoom lens system with vibration reduction

2007-08-07

2007-08-07

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S715000, C359S740000, C359S774000, C359S557000

Reexamination Certificate

active

11237743

ABSTRACT:
To provide a zoom lens system with a vibration reduction having a long back focal length suitable for a digital SLR camera, a high zoom ratio, and a wide angle of view of 70° or more. The system includes, in order from the object, a first positive lens group, a second negative lens group, a third positive lens group, and a fourth positive lens group. Upon zooming from wide-angle end state to telephoto end state, a distance between the first and second lens groups increases, a distance between the second and third lens groups decreases, and a distance between the third and fourth lens groups varies. The third lens group is composed of a positive front lens group and a negative rear lens group. Image plane correction upon camera shake can be performed by shifting only the rear lens group substantially perpendicularly to the optical axis. Given conditions are satisfied.

REFERENCES:
patent: 6462885 (2002-10-01), Nishio
patent: 2001/0022696 (2001-09-01), Nishio
patent: 10 232420 (1998-09-01), None
patent: 2001-166208 (2001-06-01), None
patent: 2002-6217 (2002-01-01), None
patent: 2003-050350 (2003-02-01), None
patent: 2003-140048 (2003-05-01), None
patent: 2003-295060 (2003-10-01), None

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