| 摘要 |
PURPOSE:To permit the speed signal generating circuit of a positioning device to respond to a fast movement and also generate a low-noise speed signal, by using a discontinuous position signal showing the position of a member and the current value signal of a driving motor. CONSTITUTION:A position signal 101 in a triangular wave shape is inputted to a differentiator 11 and gate signal generators 17 and 18; and the signal 101, when at a prescribed level +E2--E2, is differentiated and inputted to a sample holding circuit 13 via a rectifier 12 to generate a speed output 110 because a sample signal 103 is on. The signal when at any level other than the prescribed level is in a discontinuous region and a clamp signal 105 turns on, so a rectangular wave signal 107 is applied to the differentiator. The signal 107 is generated by switching the speed signal by a polarity inverter 14 according to a selective signal 102, and consequently the output 106 of the differentiator is forced to equal the differential signal 106 when the signal 105 is off, thereby speeding the rising and falling of the differential signal extremely. A slight step part of the rectifier output is eliminated by adding the current value signal 104 to the circuit 13. |
