Retroreflective material including geometric fresnel zone plates

Details Retroreflective material including geometric fresnel zone plates Retroreflective material including geometric fresnel zone plates

1975-02-10

1976-11-23

Smith, Alfred E.

350 35, 350 97, G02B 512

Patent

active

039934012

ABSTRACT:
Retroreflective material is made by recording an array of photoreduced images of an original geometric fresnel zone plate image in a photosensitive medium; using the developed photosensitive medium to make a stamper for embossing an array of phase modulated fresnel zone plates corresponding to the photoreduced images; using the stamper to emboss such fresnel zone plates in a transparent copy medium having a thickness equal to a given focal length associated with such fresnel zone plates to provide an array of such fresnel zone plates at one surface of the copy medium; and coating a reflective material on the opposite surface of the copy medium.

REFERENCES:
patent: 3565978 (1971-01-01), Folger et al.
patent: 3630593 (1971-12-01), Bartelt
patent: 3746783 (1973-07-01), Gerritsen et al.

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