Surface light source device, and liquid crystal display device, sign display apparatus and traffic sign display apparatus using the surface light source device

摘要: A surface light source device, comprising a (2); conductor (1) which has incident face (11) on at least one side end thereof confronts the (2), and emitting (12) is substantially perpendicular to (11); angle varying sheet (3) disposed of (1), wherein back (13) comprises minute structure having an average slant 0.5 7.5 degrees. The may comprise prism plurality prisms (31) are formed parallel another thereof. roughened includes fine convex members each spherical or arrays surfaces extend said have