Zoom lens

Details Zoom lens Zoom lens

1996-09-30

1998-10-20

Font, Frank G.

Optical: systems and elements

Lens

With variable magnification

359689, 359676, 359684, G02B 1514

Patent

active

058255567

ABSTRACT:
A zoom lens comprises a plurality of lens elements arranged into three lens units. More specifically, there is a first lens unit of positive refractive power, a second lens unit of negative refractive power, and a third lens unit of positive refractive power. The third lens unit is located between the first and the second lens units. The plurality of lens elements provide: (i) a zoom ratio greater than 1.5, (ii) an F
umber in the telephoto position of less than F/5 and an F
umber in the wide angle position of less than F/3.6, (iii) and an overall compactness ratio L.sub.v /f.sub.t <1.0, where L.sub.v is the distance from a front vertex of the zoom lens to the image plane in a telephoto position, and f.sub.t is the focal length of the zoom lens in the telephoto position.

REFERENCES:
patent: 4464023 (1984-08-01), Kato et al.
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 5062695 (1991-11-01), Iwasaki
patent: 5148321 (1992-09-01), Goto et al.
patent: 5216547 (1993-06-01), Ogata
patent: 5325235 (1994-06-01), Takashima et al.
patent: 5327290 (1994-07-01), Fukushima et al.
patent: 5353159 (1994-10-01), Morooka
patent: 5353160 (1994-10-01), Ogata
patent: 5424870 (1995-06-01), Hashimura et al.
patent: 5434711 (1995-07-01), Tetsuya et al.
patent: 5493448 (1996-02-01), Betensky et al.
patent: 5559636 (1996-09-01), Ito
patent: 5715096 (1998-02-01), Meyers
patent: 5726810 (1998-03-01), Meyers

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