Method of forming a retroreflective material via light interfere

Details Method of forming a retroreflective material via light interfere Method of forming a retroreflective material via light interfere

1977-04-28

1978-06-20

Sacher, Paul A.

350 97, 350162ZP, G02B 518

Patent

active

040958752

ABSTRACT:
Retroreflective material including a medium containing a plurality of diffraction elements comprising light interference fringe patterns is formed by pressing a first medium having on a surface thereof a plurality of light interference fringe patterns defining an array of phase modulated fresnel zone plates onto a surface of a copy medium having a thickness equal to a given focal length associated with the fresnel zone plates and a reflective material is coated on the opposite surface of the copy medium. In making other embodiments a plurality of fringe patterns is recorded throughout the volume of a photosensitive medium.

REFERENCES:
patent: 3586412 (1971-06-01), Leith
patent: 3924925 (1975-12-01), Gale et al.
patent: 3926637 (1975-12-01), Bartolini et al.

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