Zoom lens system

Details Zoom lens system Zoom lens system

1998-06-23

2000-06-20

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359690, 359689, G02B 1514

Patent

active

060784342

ABSTRACT:
A zoom lens system includes a first lens unit having a negative optical power, located closer to an object side, and a second lens unit having a positive optical power, located farther from the object side. Zooming is accomplished by varying the spacing between the first and second lens units. The surface of at least one lens element in the two lens units is a diffractive optical surface. At least one surface of the lens element is an aspherical surface.

REFERENCES:
patent: 5619381 (1997-04-01), Anderson
patent: 5717525 (1998-02-01), Estelle et al.
patent: 5731914 (1998-03-01), Meyers
patent: 5745301 (1998-04-01), Betensky
patent: 5768030 (1998-06-01), Estelle et al.
patent: 5852516 (1998-12-01), Chipper
patent: 5872658 (1999-02-01), Ori

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