Great relative aperture zoom lens

Details Great relative aperture zoom lens Great relative aperture zoom lens

1991-12-02

1993-03-02

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

051914760

ABSTRACT:
A great relative aperture zoom lens includes, in succession 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. The first lens unit, the third lens unit and the fourth lens unit are designed to be moved toward the object side and displaced relative to the second lens unit during magnification change from the wide angle end to the telephoto end. The second lens unit comprises a forward unit having negative refractive power and positioned on the object side, and a rearward unit having positive refractive power and positioned on the image side, and is designed to satisfy the following condition:

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patent: 4641928 (1987-02-01), Hamanishi
patent: 4657351 (1987-04-01), Mani
patent: 4756608 (1988-07-01), Itoh
patent: 5128805 (1992-07-01), Kobayashi

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