Diffractive multi-focal objective lens

Details Diffractive multi-focal objective lens Diffractive multi-focal objective lens

1996-08-27

1998-11-17

Henry, Jon W.

Optical: systems and elements

Diffraction

From zone plate

359569, G02B 2744, G02B 518

Patent

active

058384960

ABSTRACT:
A diffractive multi-focal objective lens formed, macroscopically, as a double convex lens having convex aspherical surfaces of which radii of curvatures are larger as a function of distance from the optical axis. One lens surface is provided with a microscopic diffractive lens construction that is formed as ring zones concentric about the optical axis. The diffractive lens construction is designed so that the higher the diffractive order, the shorter the focal length. For example, a first order diffractive light beam forms a first focal point F1 on the optical axis, and a second order diffractive light beam forms a second focal point F2 on the optical axis that is nearer to the lens than the first focal point F1.

REFERENCES:
patent: 4995714 (1991-02-01), Cohen
patent: 5054905 (1991-10-01), Cohen
patent: 5100226 (1992-03-01), Freeman
patent: 5229797 (1993-07-01), Futhey et al.
patent: 5344447 (1994-09-01), Swanson
patent: 5384606 (1995-01-01), Koch et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5629799 (1997-05-01), Maruyama et al.

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