Zoom lens system using a diffractive optical element and image p

Details Zoom lens system using a diffractive optical element and image p Zoom lens system using a diffractive optical element and image p

1999-04-12

2000-12-05

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359569, 359686, 359687, 359689, 359690, 359691, G02B 1514

Patent

active

061574945

ABSTRACT:
The invention provides a high-performance zoom lens system which is well corrected for chromatic aberrations by use of a DOE, makes the angle of incidence of a ray bundle on a diffractive surface as small as possible from a wide-angle side to a telephoto side thereof, and ensures the sufficient number of DOE gratings with respect to the ray bundle. The zoom lens system comprises a negative lens group G2 taking the largest zooming action and at least one positive lens group G3 on an image side thereof. The positive lens group G3 is constructed of one diffractive optical element having a diffractive surface r.sub.10.

REFERENCES:
patent: 5268790 (1993-12-01), Chen
patent: 5808810 (1998-09-01), Mihara

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