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Retroreflective articles and devices having viscoelastic lightguide

  • US 8,651,720 B2
  • Filed: 06/26/2009
  • Issued: 02/18/2014
  • Est. Priority Date: 07/10/2008
  • Status: Active Grant
First Claim
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1. An optical device comprising:

  • a light source;

    a viscoelastic light guide comprising a pressure sensitive adhesive core, wherein light emitted by the light source enters the pressure sensitive adhesive core and is transported within the core by total internal reflection; and

    a retroreflective film suitable for retroreflecting light, wherein light being transported within the viscoelastic lightguide is extracted from the lightguide and retroreflected from a structured surface of the retroreflective film.

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