PRODUCTION OF HOLOGRAM FILTER FOR RECOGNITION, HOLOGRAM FILTER FOR RECOGNITION AND RECOGNIZING DEVICE USING THIS FILTER

摘要

PURPOSE:To obtain an instantaneous and stable identification power by classifying patterns to plural groups with the patterns which are not analogous to each other as elements, shifting the positions of the individual patterns in the groups, exposing the patterns simultaneously, and superposing the pattern groups on each other, then exposing the same by each group so as to have different angles of reconstruction light. CONSTITUTION:The plural pattern groups are classified to the plural groups with the patterns which are not analogous to each other as the elements. The positions of the individual patterns in the groups are shifted and the patterns are simultaneously exposed. Further, the pattern groups are superposed on each other and are exposed so as to have the different angles of the reconstruction light with each group. Since the pattern groups of the low analogousness are recorded within the same groups at this time, the wrong recognition of the analogous characters and symbols in the same photoelectric converter is decreased. Since the nonanalogous characters and symbols are recorded in parallel, the number of multiple exposings is decreased and the degradation in diffraction efficiency is prevented. The recognition which allows instantaneous decision with the decreased fluctuations in the decision accuracy by the patterns is executed in this way.