DIFFUSER, METAL MOLD FOR DIFFUSER AND METHOD FOR MANUFACTURING DIFFUSER

WIPO Patent Application WO/2016/163275

A1

The purpose of the present invention is to provide an easy-to-manufacture diffuser which achieves easy control of radiation intensity distribution, and less incidence of uneven radiation intensity distribution and irradiance distribution. Provided is a diffuser provided with a structure having recesses and protrusions on a plane, wherein when a normal to the plane is defined as a z-axis, an x-axis is set within the plane, the x-axis is divided into a plurality of sections in a xz cross section, nx is defined as a positive integer identifying a section, the length in the x-axis direction of the section nx is represented by Snx, the maximum value of Snx is represented by Sx-max, and the minimum value of Snx is represented by Sx-min, the following expression holds. 2