Zoom lens optical system

Details Zoom lens optical system Zoom lens optical system

2007-05-22

2007-05-22

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11328903

ABSTRACT:
A compact zoom lens optical system that includes: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, wherein the first through fourth lens groups are arranged sequentially from an object, zooming is performed from a wide angle position to a telephoto position so that the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group increases, and the first through fourth lens groups satisfy:6≤LWFW+LtFt≤8where Lwdenotes a distance between a first surface of an object-side lens of the first lens group and an image surface when in the wide angle position, Ltdenotes a distance between the first surface of the object-side lens of the first lens group and the image surface when in the telephoto position, Fwdenotes an overall focal length when in the wide angle position, and the Ftdenotes an overall focal length when in the telephoto position.

REFERENCES:
patent: 5986821 (1999-11-01), Yoon
patent: 6185050 (2001-02-01), Ota et al.
patent: 2003/0002171 (2003-01-01), Sato
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patent: 2003-177317 (2003-06-01), None
patent: 2004-109653 (2004-04-01), None

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