Zoom lens

Details Zoom lens Zoom lens

2007-12-25

2007-12-25

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S689000

Reexamination Certificate

active

11304957

ABSTRACT:
A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first, second, and third lens units are arranged in that order from an object side to an image plane side of the zoom lens. The first lens unit includes a first lens having a negative refractive power, the second lens unit includes a second lens having a positive refractive power and a third lens having a negative refractive power, and the third lens unit includes a fourth lens having a positive refractive power. During zooming from a wide-angle end to a telephoto end, the first lens unit is fixed, and the second lens unit and the third lens unit are moved.

REFERENCES:
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 6757111 (2004-06-01), Takeuchi et al.
patent: 6813091 (2004-11-01), Nanba
patent: 2003-177314 (2003-06-01), None
patent: 2003-177315 (2003-06-01), None

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