Great aperture zoom lens

Details Great aperture zoom lens Great aperture zoom lens

1994-07-19

1995-05-02

Nguyen, Viet Q.

Optical: systems and elements

Lens

With variable magnification

359688, 359689, 359695, 359733, 359754, 359771, 359745, G02B 1500

Patent

active

054125073

ABSTRACT:
A great aperture zoom lens has, 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 second lens unit has, in succession from the object side, a negative lens component, a negative lens component, a positive lens component and a negative lens component. In case of the magnification change from the wide angle end to the telephoto end, the first lens unit, the third lens unit and the fourth lens unit are moved toward the object side. The zoom lens satisfies various predetermined conditions.

REFERENCES:
patent: 3584935 (1971-06-01), Kojima
patent: 4460251 (1984-07-01), Okudaira
patent: 5144488 (1992-09-01), Endo et al.
patent: 5225937 (1993-07-01), Horiuchi
patent: 5267084 (1993-11-01), Nozawa

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