| 摘要 |
<P>PROBLEM TO BE SOLVED: To move an electrically-driven fader smoothly and to start it smoothly without previously measuring operating characteristics of the electrically-driven fader. <P>SOLUTION: The arrival time to a goal position of the electrically-driven fader 5 is measured by a motor control means 2 using the output of a position detecting means 6 during the operation. When the arrival time is longer than a prescribed time, the moving speed of the electric fader 5 is compensated and controlled to be increased. And, the moving speed of the electrically-driven fader 5 is detected, and the drive is turned off if the speed is too high. The start of the electrically-driven fader 5 is smooth because a driving part 4 outputs a pattern waveform, whose duty proportion gradually becomes larger, and drives the electrically driven fader 5. <P>COPYRIGHT: (C)2004,JPO |
