Zoom lens system, optical device with zoom lens system, and...

Details Zoom lens system, optical device with zoom lens system, and... Zoom lens system, optical device with zoom lens system, and...

2011-02-15

2011-02-15

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07889439

ABSTRACT:
A zoom lens system comprises, in order from an object, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. The first lens group has a first-a partial lens group and a first-b partial lens group arranged on an image side of the first-a partial lens group with an air space and is constructed such that the first-b partial lens group moves along an optical axis direction upon focusing from infinity to a close-range object. The third lens group is constituted by a third-a partial lens group having a positive refractive power and a third-b partial lens group having a negative refractive power arranged on the image side of the third-a partial lens group with an air space.

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patent: 2004-109993 (2004-04-01), None

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