Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

1999-03-26

2000-08-22

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, 359680, 359676, G02B 1514

Patent

active

061081361

ABSTRACT:
The invention provides a wide-angle yet high-magnification zoom lens system which can have satisfactory performance with a simple lens arrangement, and an optical system which can make satisfactory correction for off-axis aberrations becoming a problem in taking wide-angle shots. The zoom lens system comprises a first lens group G1 having negative power, a second lens group G2, a third lens group G3 having positive power, a fourth lens group G4 having negative power and a fifth lens group G5. For zooming, the first group G1 moves nonlinearly and the second group G2 to the fifth group G5 moves toward an object side of the system on a wide-angle end basis. For a wide-angle end to a telephoto end of the system, the lens groups move such that spacings between the first group G2 and the second group G2, between the second group G2 and the third group G3 and between the fourth group G4 and the fifth group G5 become narrow while a spacing between the third group G3 and the fourth group G4 becomes wide. An aspherical surface is at least used in the first group G1. The zoom lens system satisfies a condition 0.7<.vertline.f.sub.1 /f.sub.w <3 where f.sub.1 is a focal length of the first group G1 and f.sub.w is a focal length of the zoom lens system at a wide-angle end of the system.

REFERENCES:
patent: 4172635 (1979-10-01), Ogino
patent: 4190323 (1980-02-01), Ogawa et al.
patent: 4299454 (1981-11-01), Betensky
patent: 5504626 (1996-04-01), Oshikiri
patent: 5576890 (1996-11-01), Tanaka et al.
patent: 5774267 (1998-06-01), Kodama et al.
patent: 5982429 (1999-11-01), Kamamoto et al.

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