Zoom lens system, imaging apparatus, method for zooming, and...

Details Zoom lens system, imaging apparatus, method for zooming, and... Zoom lens system, imaging apparatus, method for zooming, and...

2011-03-15

2011-03-15

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S557000

Reexamination Certificate

active

07907350

ABSTRACT:
Providing a high optical performance zoom lens system with realizing a high zoom ratio and compactness suitable for a highly integrated electronic imaging device. The system includes, in order from an object along an optical axis: a first group G1having positive refractive power; a second group G2having negative refractive power; a third group G3having positive refractive power; a fourth group G4having positive refractive power; and a fifth group G5having negative refractive power. Upon zooming from a wide-angle end state W to a telephoto end state T, the second group G2and the fourth group G4are moved along the optical axis. The first group G1includes, in order from the object along the optical axis, a front group G1fhaving negative refractive power, an optical-path-bending element P for bending an optical path, and a rear group G1rhaving positive refractive power. Given expression is satisfied.

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