Dual grooved Fresnel lens for overhead projection

Details Dual grooved Fresnel lens for overhead projection Dual grooved Fresnel lens for overhead projection

1988-12-16

1990-02-13

Arnold, Bruce Y.

350452, G02B 308

Patent

active

049001299

ABSTRACT:
This invention consists of a Fresnel lens having focusing grooves on both sides of a single element. The relative frequencies of the grooved surfaces are controlled such that Moire fringe patterns between the two grooved surfaces are reduced. Specifically, the frequency of the Fresnel elements on one surface of the element is at least four times that of the Fresnel elements on the other surface and not a integral multiple thereof.

REFERENCES:
patent: 4044889 (1977-08-01), Orentreich et al.

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