Zoom lens system

Details Zoom lens system Zoom lens system

2006-10-17

2006-10-17

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S570000

Reexamination Certificate

active

07123422

ABSTRACT:
To provide a zoom lens system having high optical performance by using a diffractive optical element, the system includes a first group having positive power, a second group having negative power, and a third group having positive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first group and the second group and a distance between the second group and the third group vary. The third group is composed of a front group having positive power locating to the object side of the largest space in the third group and a rear group having negative power locating to an image side of the space. The front group includes an aperture stop and a diffractive optical surface. An incident angle of a principal ray reaching the maximum image height to the diffractive optical surface is ten degrees or less. Given condition is satisfied.

REFERENCES:
patent: 6704149 (2004-03-01), Ohmori et al.
patent: 11-305126 (1999-11-01), None
patent: 2004-258239 (2004-09-01), None
Introduction to Diffractive Optical Elements, Published by OPTRONICS, May 20, 1997, pp. 7-14, 30-35, and 117-125 (with English translation).

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