Zoom lens assembly

Details Zoom lens assembly Zoom lens assembly

2005-01-04

2005-01-04

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

06839184

ABSTRACT:
A lens assembly includes a first group of lens having negative power, a second group of lens having positive power, and a third group of lens having positive power arranged in sequence from an object side. A gap between the first group of lens and the second group of lens is reduced and a gap between the second group of lens and the third group of lens is widened when wide mode changed to Tele mode. The first group of lens has a negative meniscus lens with a convex surface facing the object side and a positive meniscus lens with a convex surface facing the object side. The second group of lens has a positive glued-lenses and a negative meniscus lens with a convex surface facing the object side. The third group of lens is a bi-convex lens.

REFERENCES:
patent: 6124984 (2000-09-01), Shibayama et al.
patent: 6671103 (2003-12-01), Itoh
patent: 20030133201 (2003-07-01), Nanba et al.
patent: 20030189762 (2003-10-01), Mihara et al.

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