Zoom lens system

Details Zoom lens system Zoom lens system

1994-02-15

1996-08-06

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359692, 359708, 359713, 359714, G02B 1514, G02B 1318

Patent

active

055439705

ABSTRACT:
A zoom lens system according to the present invention comprises, from the object side to the image side, a first lens unit with a positive refractive power including a negative high dispersion lens element and a positive lens element; a second lens unit with a negative refractive power consisting of two or three lens elements including a positive high dispersion lens element and a negative lens element, and having at least one aspherical surface; and a third lens unit with a positive refractive power consisting of five or less lens elements including a negative high dispersion lens element and one or two positive lens elements located on the object side of the negative high dispersion lens element, and having at least one aspherical surface. With the lens arrangement, a compact high-zoom-ratio zoom lens system having a high aberration correction performance is realized.

REFERENCES:
patent: 4659186 (1987-04-01), Sato et al.
patent: 4925280 (1990-05-01), Hashimoto
patent: 4984876 (1991-01-01), Hata

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