Zoom lens system

Details Zoom lens system Zoom lens system

1997-12-22

1999-05-11

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, 359685, G02B15/14

Patent

active

059033983

ABSTRACT:
A zoom lens system including a first lens group of a positive refractive power having two lenses which moves linearly toward an object for a magnification change; a second lens group of a negative refractive power at least having one lens of a negative refractive power and one lens of a positive refractive power adhered thereto; a third lens group of a positive refractive power which moves non-linearly toward the object for a magnification changes; and a fourth lens group of a negative refractive power which moves linearly toward the object for a magnification change.

REFERENCES:
patent: 5493447 (1996-02-01), Ohtake
patent: 5528427 (1996-06-01), Tanaka et al.
patent: 5642224 (1997-06-01), Suzuki
patent: 5666231 (1997-09-01), Ohtake
patent: 5815320 (1998-09-01), Hoshi et al.

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