Patent ID: 7855766

Claim:
A device for generating pattern data for unevenness that is randomly arranged on a reflecting surface, said device comprising: a coordinate displacement device that generates a multiplicity of displaced coordinates that are randomly displaced in two dimensions with a limitation on the arrangement of patterns to prevent overlap or excessive distance between patterns, wherein the limitation on the arrangement of patterns includes limiting pattern arrangement according to a relationship between a basic pitch, a movable range and a pattern unit dimension; a pattern generator that arranges said patterns according to at least a portion of or all of said displaced coordinates generated by said coordinate displacement device to generate the pattern data for unevenness that is randomly arranged on the reflecting surface; and an entry confirmation device, wherein at least one of the following is further included: (i) the patterns are dot patterns, wherein the pattern unit dimension is a dot diameter, wherein the pattern generator arranges predetermined dot patterns, and wherein the entry confirmation device determines whether or not said basic pitch P, said movable range R, and said dot diameter D satisfy the relationship: P≧2R+D; and (ii) the patterns are line patterns, wherein the pattern unit dimension is a line width, wherein the pattern generator arranges predetermined line patterns, and wherein the entry confirmation device determines whether or not said basic pitch P, said movable range R, and said line width W satisfy the relationship: P≧2R+W.