| 摘要 |
PURPOSE:To increase and uniformalize the luminosity in an advertizing medium and make the whole size thin by providing both sides having transparent groove parts with reflection boards or reflection mirrors, and limiting the area of inclination angle of groove side face. CONSTITUTION:A plurality of groove parts 1b are formed on a face 1a of a transparent board 1. The degree of inclination angle thetaa, thetab of each groove part 1b with respect to the face 1a of inclination face 1c, 1d facing a light source 2 is set in a range so that the faces 1c, 1d reflect all light beams (a), (b) form the source 2 incident to the face 1a parallelly, and the beams are not reflected against another face 1e. A reflection board 4 is arranged on the side of face 1a of the board 1 and an advertizing medium is arranged on the side of face 1e. It is thus possible to uniformly increase the luminosity in the advertizing medium and make the whole size thin. |
