| 摘要 |
PURPOSE:To prevent the titled circuit from malfunction by inhibiting auto- focusing operation by an inhibiting means on the way of the rotation of a zoom ring, and only when the zoom ring is rotated from the wide angle side to the telephotographic side, releasing the inhibition of the autofocus operation based on the inhibiting means simultaneously with the completion of the rotation. CONSTITUTION:When the zoom ring 4 completes the rotation of the telephotographic direction, an output from an output terminal C is turned from the 'H' level to the 'L' level, monostable multivibrator 26 is triggered by the trailing edge of the output and outputs a reset signal. A flip-flop (FF) 25 is reset and a switch 27 is closed. Although auto-focus waiting state is held during the rotation of the zoom lens 4 in the telephoto direction, the auto-focus waiting state, is forcedly released by stopping the rotation of the ring 4 is at a required zoom position simultaneously with the stop of the rotation even if the output of an absolve value forming circuit 20 is less than a threshold voltage V0, the zoom ring 4 is turned from the wide to the telephotographic side by new climbing control and out-of-focus image to be generated by the decrease of the depth of a field can be corrected. |
