Retroreflective material made by recording a plurality of light

Details Retroreflective material made by recording a plurality of light Retroreflective material made by recording a plurality of light

1975-02-10

1977-07-19

Corbin, John K.

350 35, 350162ZP, G02B 512

Patent

active

040365522

ABSTRACT:
Retroreflective material including a medium containing a plurality of diffraction elements comprising light interference fringe patterns for enabling provision of a retroreflective effect upon light incident thereon. In making one embodiment a plurality of light interference fringe patterns defining an array of phase modulated fresnel zone plates is replicated by embossing at one 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: 3575629 (1971-04-01), O'Keeffe
patent: 3614193 (1971-10-01), Berser
patent: 3675990 (1972-07-01), Kogelnik et al.
patent: 3735278 (1973-05-01), Schafer et al.
patent: 3794426 (1974-02-01), Mueller et al.

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