| 摘要 |
PURPOSE:To simplify a control circuit and to make accurate positioning possible by using a deceleration position sensor and a target stop position sensor and correcting the position if a lens stops before a target stop position or overruns it. CONSTITUTION:If a timer expires before a target stop position sensor PS detects a master lens 4, it is discriminated that the driving speed of a motor M1 becomes zero before the lens 4 reaches the target stop position, and therefore, a master motor low speed signal is set to drive the motor M1 in a low speed again. If the sensor PS detects the lens 4 before the timer expires, the motor M1 is stopped to confirm whether the lens 4 is stopped or not. If the lens 4 overruns the target stop position, a master motor-on signal is set, and a master motor reverse signal is inverted to change the driving direction, and the master motor low speed signal is set, and the lens 4 is returned slowly until the sensor PS detects the lens 4 again. |
