Zoom lens and electronic imaging system using the same

Details Zoom lens and electronic imaging system using the same Zoom lens and electronic imaging system using the same

2006-12-26

2006-12-26

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S679000

Reexamination Certificate

active

07154680

ABSTRACT:
The invention relates to an expensive zoom lens that has a zoom ratio of as high as about 5 and high optical performance and is very thin in its depth direction. With the invention, the optical path of the optical system is easily bendable by means of a reflecting optical member. The zoom lens includes a first lens group G1having positive power, a second lens group G2having negative power, a third lens group G3having positive power and a fourth lens group G4having positive power, and comprises five lens groups in all. The first lens group G1comprises, in order from its object side, a lens component of negative refracting power, an optical path-bending reflecting optical member P and a lens component of positive refracting power. Upon zooming from the wide-angle end to the telephoto end, the first lens group remains substantially fixed with respect to an image plane I, the second lens group G2moves only toward the image side, and the fourth lens group G4moves in such a way as to be positioned nearer to the object side at the telephoto end than at the wide-angle end.

REFERENCES:
patent: 4246148 (1981-01-01), Shimp et al.
patent: 6104432 (2000-08-01), Nakamura et al.
patent: 6333823 (2001-12-01), Ozaki et al.
patent: 6754446 (2004-06-01), Hagimori et al.
patent: 2004/0233302 (2004-11-01), Kojima
patent: 2004-037967 (2004-02-01), None

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