| 摘要 |
PURPOSE:To perfectly bring all of slit rows to a gray code system, by forming an additional code successively changing by one bit between adjacent non-gray codes at the time of non-gray between the mutual codes corresponding to adjacent slit rows. CONSTITUTION:At the time of non-gray between a code 059 of an angle 359 deg. and a code 399 of an angle 000 deg., codes 0, 12, 9 of a dummy angle 359' and codes 3, 12, 9 of a dummy angle 000' are inputted. That is, the dummy codes 0, 12, 9 and 3, 12, 9 are determined so as to successively change by one bit between adjacent non-gray codes 059, 399 and all codes can be brought to a perfect gray code system by two gray forming additional codes. Therefore, even if the irregularity in the response speeds or level judging threshold values of a circuit system is present or there is a slight error in slit processing, no error is generated in an output signal.
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