Triangular-pyramidal cube-corner retroreflection sheet

• Main Authors: Mimura, Ikuo, Adachi, Keiji
• Format: Patent
• Language: English
• Published: 21.05.2002

The present invention relates to a triangular-pyramidal cube-corner retroreflective sheeting having a novel structure. More minutely, the present invention relates to a triangular-pyramidal cube-corner retroreflective sheeting in which triangular-pyramidal reflective elements having a novel structure are arranged in the closest-packed state. A triangular-pyramidal cube-corner retroreflective sheeting characterized in that a lateral face (prism face) (face c) using a base edge (x) of triangular-pyramidal reflective elements faced each other and arranged in the closest-packed state by sharing the base edge (x) on a base plane (X-X′) as one side is hexagonal or triangular, two other faces (faces a and b) sharing one ridge line starting with an apex (H) of the triangular-pyramidal reflective elements is quadrangular and when assuming the height from the apex (H) up to the base plane (X-X′) as (h) and the height up to a substantially horizontal plane (Z-Z′) including base edges (z and w) of other two faces (faces a and b) as (h), and the angle formed between the optical axis of the triangular-pyramidal reflective elements and a plane (Y-Y′) including the base edge (x) and vertical to the base plane (X-X′) as ( ), h and hare not substantially equal to each other but h/hand meet a specific relational expression.