Optical films for creating unique optical effects

Details Optical films for creating unique optical effects Optical films for creating unique optical effects

2007-11-20

2007-11-20

Chang, Audrey (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S569000, C359S567000, C359S742000

Reexamination Certificate

active

10805850

ABSTRACT:
An optical layer comprises a sheet of material having a surface. The surface comprises a plurality of optical elements. The optical elements are comprised of microscopic patterns in the surface that cooperate to produce an image. Each of the elements has a focal length. At least some of the focal lengths are significantly different from other focal lengths, such that some portions of the surface appear to be closer to a viewer than other portions of the surface.

REFERENCES:
patent: 3661385 (1972-05-01), Schneider
patent: 4492442 (1985-01-01), Gaudyn
patent: 5956164 (1999-09-01), Waitts
patent: 6700712 (2004-03-01), Servatius et al.
patent: 6800357 (2004-10-01), Keberlein

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