Zoom lens system

Details Zoom lens system Zoom lens system

1997-02-03

1999-02-16

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359565, 359576, 359589, 359685, 359686, 359687, 359692, 359708, 359724, 359742, G02B 1514, G02B 2744, G02B 308, G02B 1318

Patent

active

058726586

ABSTRACT:
A zoom lens system includes, from the object to image side, a first lens unit of a positive refractive power having a first lens element with a power to both diffract and refract light. A second lens unit has a negative refractive power and may include a second lens element having both the power to diffract and refract light, and it least a third lens unit is included. A zooming operation is performed by varying the distances between the respective first, second, and third lens units.

REFERENCES:
patent: 5629799 (1997-05-01), Maruyama et al.

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