Mikio MIMURA, Atsuya ISHIDA and Kouichi HAYAKAWA

Department of Applied Physics, Faculty of Engineering, Osaka City University, Sumiyoshi-ku, Osaka, 558 Japan

(Received July 25, 1996; Accepted August 19, 1996)

A diffraction grating matrix made of negative film is applied to display dot characters. Using an X-Y plotter of a personal computer, a multiple grating pattern is plotted in a matrix form. The photograph of the pattern is the negative-film diffraction grating matrix. When a laser light illuminates the grating matrix, the diffracted light displays a dot character. Several alphabetic characters are displayed in this way.

Key words : diffraction, grating matrix, negative film, X-Y plotter, dot character