| 摘要 |
PURPOSE:To eliminate the unstability of a device owing to transient fluctuations by providing a delay circuit consisting of capacitors and transistors for electric discharging to the input of the driving circuit of a taking lens, disabling the lens driving circuit for a fixed time and instantaneously discharging the charge of the capacitors. CONSTITUTION:In the taking lens driving control circuit, transistors TR1-TR4 control the forward and backward revolutions of a taking lens drive motor MT. TR5 and TR6 are transistors for controlling the TR1 and TR2, and the driving of the TR5, TR6 is delayed by way of capacitors C1, C2. On the other hand, the charge of the C1, C2 is instantaneously discharged by way of TR7, TR8, whereby the turning-off of the TR5, TR6 is made early to prevent the taking lens from fluctuating. The motor MT is revolved in a forward or backward direction by the combinations of the H level and L level of the focus detecting information MV1- MV4 from a focus control circuit, whereby the focusing is controlled. Thereby, the unstability owing the transient fluctuations of the focus detector is removed and the device is stably operated. |
