Zoom lens system

Details Zoom lens system Zoom lens system

1997-06-13

1999-07-13

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

059234784

ABSTRACT:
The object of the present invention is to provide a high-performance zoom lens system that has a small number of lens elements and can also be used for wide-angle purpose. In order to achieve the object, said zoom lens system has, from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power and a fourth lens unit having positive refractive power, wherein said zoom lens system varies magnification by changing a distance between at least said first and second lens units, wherein at least one of said lens units includes a gradient index lens, said gradient index lens having at least one aspherical surface.

REFERENCES:
patent: 4976521 (1990-12-01), Ishii et al.
patent: 4998807 (1991-03-01), Uzawa et al.
patent: 5046833 (1991-09-01), Tsuchida
patent: 5184251 (1993-02-01), Tsuchida et al.
patent: 5313328 (1994-05-01), Aoki
patent: 5321552 (1994-06-01), Horiuchi et al.
patent: 5541775 (1996-07-01), Kiriki

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