| 摘要 |
PURPOSE:To ensure an accurate and smooth shift to a servo control state, by using a servo gain control circuit which sets the gain of a servo control system at low sensitivity when the operation is started, and then changing the gain gradually to high sensitivity. CONSTITUTION:A current flows slowly to a capacitor 14 via a resistance 13, and the terminal voltage of the capacitor 14 rises up gradually in accordance with a time constant as shown by (b). When the terminal voltage approximates to 0V, the gate potential of an FET6 rises up by a resistance 8. Thus the FET6 conducts gradually. Then the gain of a servo control system rises up gradually as shown by (c) since the signal F branches to the FET6. Then the FET6 is completely turned on about 1sec after the actuation of the servo control system is started. At the same time, a resistance 4 is short-circuited. As a result, the gain of the servo control system has a high sensitivity set at a resistance 3. |
