Internal focusing zoom lens system

Details Internal focusing zoom lens system Internal focusing zoom lens system

1995-06-07

1997-12-16

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359685, 359687, G02B 1514

Patent

active

056991983

ABSTRACT:
An internal focusing zoom lens comprises a first lens group of positive refracting power, a second lens group of negative refracting power, a third lens group of positive refracting power and a fourth lens group of positive refracting power disposed in the named order from the object side, in which at least the first lens group, the third lens group and the fourth lens group move toward an object along the optical axis during zooming from wide angle to telephoto such that an air gap increases between the first lens group and the second lens group, an air gap decreases between the second lens group and the third lens group and an air gap decreases between the third lens group and the fourth lens group, in which the second lens group moves toward the object along the optical axis during focusing, and which satisfies various conditions.

REFERENCES:
patent: 5000551 (1991-03-01), Shibayama
patent: 5018843 (1991-05-01), Inadome et al.
patent: 5144488 (1992-09-01), Endo et al.
patent: 5191476 (1993-03-01), Sato
patent: 5241420 (1993-08-01), Yamanashi
patent: 5412507 (1995-05-01), Sato

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