Compact zoom lens

Details Compact zoom lens Compact zoom lens

2007-11-06

2007-11-06

Spector, David N. (Department: 2873)

Optical: systems and elements

Holographic system or element

Authentication

C359S680000, C359S689000

Reexamination Certificate

active

11443648

ABSTRACT:
A compact zoom lens that include: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power, wherein the first through third lens groups are arranged sequentially from an object when zooming is performed from a wide angle position to a telephoto position, a distance between the first lens group and the second lens group decreases and a distance between the second lens group and the third lens group increases, and the zoom lens includes at least one plastic lens and satisfies the inequality1≤(G⁢⁢1+G⁢⁢2+G⁢⁢3)fw≤1.8where G1denotes a thickness of the first lens group, G2denotes a thickness of the second lens group, G2denotes a thickness of the third lens group, and fw denotes an overall focal length at the wide angle position. Accordingly, the zoom lens can ensure a high zoom ratio, and be made compact and light at low manufacturing costs.

REFERENCES:
patent: 6804064 (2004-10-01), Hirakawa
patent: 7079326 (2006-07-01), Hirakawa
patent: 7092170 (2006-08-01), Satori
patent: 7180679 (2007-02-01), Nose et al.
patent: 2000-267009 (2000-09-01), None
patent: 2002-372667 (2002-12-01), None
patent: 2003-050352 (2003-02-01), None
patent: 2005-258067 (2005-09-01), None

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