Zoom lens system

Details Zoom lens system Zoom lens system

1997-01-15

2000-05-23

Epps, Georgia

Optical: systems and elements

Diffraction

From zone plate

359576, 359677, 359692, 359742, G02B 2744, G02B 518, G02B 1514, G02B 308

Patent

active

060671963

ABSTRACT:
A zoom lens system has the first and second lens units. During zooming from a wide-angle end to a telephoto end, the lens units are moved to decrease a distance therebetween. The first lens unit has a positive refractive power. The second lens unit has a negative refractive power. The zoom lens system is provided with at least one surface having a power to diffract light.

REFERENCES:
patent: 4936661 (1990-06-01), Betensky et al.
patent: 4972075 (1990-11-01), Hamada et al.
patent: 5268790 (1993-12-01), Chen
patent: 5493441 (1996-02-01), Chipper
patent: 5619381 (1997-04-01), Anderson

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