Patent ID: 7787079

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 dot patterns; a pattern generator that arranges said dot patterns according to at least a portion of or all of said displaced coordinates generated by said coordinate displacement device to generate pattern data; and further comprising at least one of: (i) an entry confirmation device that determines whether or not a basic pitch P, a movable range R, and a dot diameter D, entered in connection with the limitation on the arrangement of patterns, satisfy the relationship: P≧2R+D; (ii) an arranging device that arranges the displaced coordinates in positions such that even-numbered rows of the displaced coordinates are displaced by one-half of said basic pitch in the column direction relative to odd-numbered rows of the displaced coordinates; and (iii) a displacement device that displaces said displaced coordinates such that half-width H of a distribution graph of the displacements of said displaced coordinates satisfies the relationship with said basic pitch P: 0.3 P≦H≦0.9 P.