Zoom lens system

Details Zoom lens system Zoom lens system

2007-10-23

2009-08-25

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C348S240300, C396S072000

Reexamination Certificate

active

07580201

ABSTRACT:
A zoom lens system includes, in order from an object side to an image side, a first positive lens group (G1), a second negative lens group (G2), a third positive lens group (G3), and a fourth positive lens group (G4). The second and third lens groups are movable for varying the focal length. The zoom lens system offers a four-times zoom ratio, and employs two plastic aspheric lenses (L3, L9) and a resin hybrid lens (L6). The first lens group consists of two lenses (L1, L2) arranged in an abutting relationship. The second and third lens groups each includes a pair of cemented lenses (L4, L5; L7, L8).

REFERENCES:
patent: 5103343 (1992-04-01), Sekita
patent: 5712733 (1998-01-01), Mukaiya
patent: 6014268 (2000-01-01), Yahagi
patent: 6744571 (2004-06-01), Ishii et al.
patent: 7113346 (2006-09-01), Souma et al.
patent: 2005/0002115 (2005-01-01), Mihara
patent: 2006/0044423 (2006-03-01), Hagimori et al.
patent: 2007/0115561 (2007-05-01), Chuang et al.

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