| 摘要 |
PURPOSE:To measure a rotational angle and a rotational speed by converting signals from two detecting elements, arranged on a rotary disk nearly symmetrically with respect to rotation into rectangular waves, and then processing them by time-division detection by using a common pulse generator and a counter. CONSTITUTION:When a rotating shaft 11 rotates, an index plate 13 and a rotary disk 12 move relatively, and photoelectric converting elements 15 and 15' output photoelectric conversion signals of sine waves, which are converted into rectangulary wave signals A and B by amplifiers 16 and 16' and Schmitt trigger circuits 17 and 17'. A pulse generating circuit 19 has a frequency much higher than the frequencies of the signals 6A and 6B, and then reads the signals A and B on time-division basis by out-of-phase clock pulses having the same frequency from a generator 18 to generate a pulse at the point in time when the signals A and B vary. The value of the counting 20 of said pulse is halved and averaged to display a value under no influence of a shaft plate and eccentricity on a part 21. |
