REFLECTIVE STRUCTURE HAVING A DIRECTIVITY OF DIFFUSE REFLECTION AND APPARATUS WITH IT

摘要

An object of the invention is to provide a reflective structure which can cause diffused reflecting light to have a desired directivity more reliably and an apparatus with it. An optical diffusing reflective structure 1 having an optical reflective layer 20 whose surface is roughened and which is supported by a base layer 10. The optical reflective layer 20 comprises mesh potions 2h arranged in mesh form and each having one shape of a cave and a rise and a net portion 2M continuously extending around these mesh portions 2h in net form and having the other shape of a cave and a rise. The net portion 2M is classified in a plan view into a first extending elements Po' extending in a predetermined first direction #1 and in a second direction #2 that intersects the first direction #1 almost at a right angle and a second extending elements Ps' extending substantially at 45º with respect to the first and second directions #1 and #2. The first and second extending elements Po' and Ps' have the respective substantially constant widths, and widths of the first extending elements Po' are greater than widths of the second extending elements Ps' to have greater effective reflective surface area per unit extending length.