Zoom lens with diffractive optical elements

Details Zoom lens with diffractive optical elements Zoom lens with diffractive optical elements

1998-10-26

1999-11-02

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359576, 359570, 359708, G02B 1300

Patent

active

059781530

ABSTRACT:
A zoom lens includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, and a subsequent lens unit of positive refractive power as a whole, wherein during zooming from a wide-angle end to a telephoto end, at least the first lens unit is moved along an optical axis such that a separation between the first lens unit and the second lens unit increases, and wherein at least one diffractive optical element is provided in the first lens unit.

REFERENCES:
patent: 5044706 (1991-09-01), Chen
patent: 5268790 (1993-12-01), Chen et al.
patent: 5493441 (1996-02-01), Chipper
patent: 5847877 (1998-12-01), Imamura et al.

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