| 摘要 |
PURPOSE:To achieve saving of power by specifying the control method of an objective lens drive motor. CONSTITUTION:The 1st circuit consisting comparators C1, C2 and NAND gate G1, the 2nd circuit consisting of a switch SW 1 and resistance R5 and the 3rd circuit consisting of NAND gates G2, G3, stop circuit 14 are connected to the control circuit 13 of a motor M which drives an objective lens 10. As a result of this, the focus matching signal is formed from the output of a focus detecting circuit 11 by the 1st circuit and the operation signal is formed in cooperation to the displacement of a shutter button from the home position to a half-pushed position by the 2nd circuit. The 3rd circuit stops the motor M when inputted with the focus match signal by way of the control circuit 13 and operates the motor M when inputted with the operation signal. Hence, the idle operation of the motor during the time after resetting of the return mirror until new framing is done is obviated. |
