| 摘要 |
<p>PURPOSE:To effect stable rotational phase control, by a method wherein counting is started by a counting means through a clock in response to a positional signal while a finishing signal is outputted upon finishing the counting given by a digital value. CONSTITUTION:An SWP generating circuit 2 outputs a positional signal SWP showing that a rotary body has arrived at a predetermined position. A phase controlling variable resistor 5 controls the rotational phase of the rotary body. An A/D converter 6 converts a potential, set by the variable resistor 5, into a digital value. A counter 7 starts counting by the repeated period of a clock signal CLOCK in response to the positional signal SWP and finishes the counting by the digital value from the A/D converter 6 while outputs a finishing signal D-DPG upon finishing. A drum rotational phase control circuit 4 controls the rotational body by the finishing signal D-DPG.</p> |
