Retroreflective articles and devices having viscoelastic lightguide
Disclosed herein is an optical device having a light source, a viscoelastic lightguide and a retroreflective film suitable for retroreflecting light. Light from the light source enters the viscoelastic lightguide and is transported within the lightguide by total internal reflection. The optical device may have a “front lit” configuration such that light being transported within the lightguide is extracted and retroreflected by the film toward a viewer. The optical device may have a “back lit” configuration such that light being transported within the lightguide is extracted and transmitted through the film toward a viewer. The retroreflective film may comprise beaded retroreflective sheeting such as that used in traffic signs and markings.
3M Innovative Properties Company
G G G G
G02B G02B G09F G09F
inventional inventional inventional additional
Thu-Van T. Kevin R. Michael A. Audrey A. Marie A.
Tran Schaffer Meis Sherman Boulos