| 摘要 |
PURPOSE:To allow an object to approach a target position speedily without overrunning by holding voltages a half output voltages regarding the target position and a current position, and controlling the movement of the object initially on the basis of the difference voltage and then by a comparison with the held voltages. CONSTITUTION:When a movement start switch 7 is pressed, an FF8 generates an output to turn on an SW9, and sample holding operation 6 is carried out through a multivibrator MMV10 and an OR gate 11. The differential output V between voltages VO and VP corresponding to the initial object position and target position is inputted to a changeover switch 16 and comparators 17 and 18 and also attenuated by an attenuator 5 to 1/2V, which is sampled and held at a section 6 to obtain VM; and a comparator 12 compares the obtained voltage with the voltage V. Then, + or -Vcc (VD) are obtained according to comparison results to control a driving means 2. When -Vcc is obtained, a brake is applied. Further, VD is integrated by an integrator 13 and compared with a reference voltage 0V by a comparator 14, whose output is used for the holding 6 of the current output of the attenuator 5 through an MMV15 and the OR gate 11; and a switch 16 is changed over to (b) lastly and the output V is passed through an OR gate 19 to control driving operation. Thus, the object is moved speedily and never overruns. |
