Patent Number: 6,166,856

Title: Self light-emitting retroreflective sheet and method for producing the same

Abstract: The present invention provides a self light-emitting retroreflective sheet including a light-transmitting retroreflective element including a plurality of prismatic projections, a lining film, and an electroluminescence device. The lining film includes a light-transmitting film which has sealing projections on one of its surfaces so that the prismatic projections are confined within a plurality of sealed cells formed by the sealing projections. In the sealed cells, a surface of the prismatic projections interface with air so as to increase light-emitting luminance and improve its uniformity.

Inventors: Araki; Yoshinori (Sagae, JP), Abe; Hidetoshi (Tendo, JP), Matsumoto; Kazumi (Sagamihara, JP)

Assignee: 3M Innovative Properties Company

International Classification: G02B 5/124 (20060101); G02B 5/12 (20060101); G02B 007/180 (); G09F 013/20 (); G09F 013/22 ()

Expiration Date: 12/26/2017