Zoom lens

Details Zoom lens Zoom lens

1995-07-24

1996-12-24

Anderson, Bruce C.

Optical: systems and elements

Lens

With variable magnification

359685, G02B 1514

Patent

active

055878407

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of positive refractive power and a fourth lens unit of negative refractive power, totaling four lens units, wherein, when zooming from the wide-angle end to the telephoto end, the lens units move axially in such relation that the air separation between the first lens unit and the second lens unit increases, the air separation between the second lens unit and the third lens unit increases and the air separation between the third lens unit and the fourth lens unit decreases.

REFERENCES:
patent: 4756609 (1988-07-01), Estelle
patent: 4787718 (1988-11-01), Cho
patent: 5111338 (1992-05-01), Nakayama
patent: 5184251 (1993-02-01), Tsuchida et al.
patent: 5270865 (1993-12-01), Kikuchi et al.
patent: 5274504 (1993-12-01), Itoh
patent: 5365376 (1994-11-01), Itoh
patent: 5493447 (1996-02-01), Ohtake

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