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

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

2007-06-12

2008-11-04

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S770000, C359S689000, C359S680000

Reexamination Certificate

active

07446956

ABSTRACT:
A zoom lens system having higher optical performance, a wide angle of view, a high zoom ratio, and compactness include, in order from an object, a first group having negative power, a second group having positive power, and a third group having positive power. At least the first and second lens groups are moved upon zooming. The first group has, in order from the object, a negative meniscus lens having a convex surface facing the object, and a positive lens. At least one surface of the negative meniscus lens is an aspherical surface. The second group has, in order from the object, a first positive lens, a second positive lens, a negative lens, and a third positive lens. At least one surface of the first positive lens is an aspherical surface. The third group has one positive lens, and at least one surface thereof is an aspherical surface.

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