Zoom lens system

Details Zoom lens system Zoom lens system

1994-12-08

1997-05-06

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359775, 359690, G02B 1514

Patent

active

056276826

ABSTRACT:
A zoom lens system comprising, in order from the object side, a first lens unit which has a positive refractive power and is to be kept stationary for zooming the lens system, a second lens unit which has a negative refractive power and is movable for zooming said lens system, and a third lens unit which has a positive refractive power and is to be kept stationary for zooming the lens system: the second lens unit consisting of a front subunit having a negative refractive power and a rear subunit having a negative refractive power. The zoom lens system is configured so as to corect a deviation of an image location by varying, during zooming, an airspace reserved between the front subinit and the rear subunit.

REFERENCES:
patent: 3922070 (1975-11-01), Macher
patent: 4135786 (1979-01-01), Ikemori

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