| 摘要 |
<p>PURPOSE:To execute a stable tracking control in a short time in a tracking controller using electromechanical conversion elements. CONSTITUTION:This controller is provided with a tracking reference value preparing circuit 109 which prepares the reference value of a tracking control, diving data comparing circuit 110 which drives the electric/mechanical conversion elements, direct current component integration circuit 112 which integrates direct current voltage components included in driving data, and detection signal preparing circuit 113 which prepares a detection signal 114 for resetting the tracking reference value from the output value of the direct current component integration circuit 112. When the integrated result being the output of the direct current component integration circuit 112 is beyond a prescribed range, the resetting of the tracking reference value is executed.</p> |
