Transparent optically variable device

Details Transparent optically variable device Transparent optically variable device

1989-04-26

1994-01-11

Arnold, Bruce Y.

Optical: systems and elements

Light interference

Produced by coating or lamina

283 91, 283902, 359580, G02B 528, B42D 1500

Patent

active

052785904

ABSTRACT:
Transparent optically variable device comprising a symmetric three-layer coating. The three-layer coating has first and second partially transmitting absorber layers and a dielectric spacer layer disposed between the first and second absorber layers.

REFERENCES:
patent: 3858977 (1975-01-01), Baird et al.
patent: 4048039 (1977-09-01), Daxinger
patent: 4639069 (1987-01-01), Yatabe et al.
patent: 4705300 (1987-11-01), Berning et al.
patent: 4705356 (1987-11-01), Berning et al.
patent: 4721217 (1988-01-01), Phillips et al.

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