Dispersion plate with two=dimensional periodical microstructure - is formed as mat plate with superimposed patterns, each having many circular microstructures

摘要

The plate contains a number of superimposed patterns, each of which has a large number of microstructures. The grid vectors correspond to the periodical arrangement of the microstructures, varying in agreement with the pattern. The basic patterns have the same periodical arrangement and are superimposed with a predetermined angle phase difference. The basic patterns can have an identical or a differing arrangement. The microstructure when viewed in the normal direction to the basic patterns are circular. The dispersal plate comprises a single plate element or separate such elements with dispersing surfaces opposed to one another. USE - For use as a sharpness adjustment screen in a one-eye mirror reflex camera.