Zoom lens

Details Zoom lens Zoom lens

1994-11-22

1998-06-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359688, G02B 1514

Patent

active

057609675

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power for varying the focal length, a third lens unit of positive or negative refractive power for compensating for the image shift with zooming, an aperture stop and a fourth lens unit having the image forming function and stationary during zooming, wherein the first lens unit has a front lens sub-unit of negative refractive power, a first lens sub-unit of positive refractive power and a second lens sub-unit of positive refractive power, and wherein during focusing from an infinitely distant object to an object at the minimum distance, at least the first and second lens sub-units are axially moved.

REFERENCES:
patent: 4099845 (1978-07-01), Takesi
patent: 5136431 (1992-08-01), Terasawa et al.
patent: 5572276 (1996-11-01), Hirakawa

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