| 摘要 |
PURPOSE:To make a stable seek operation possible by controlling always the current flowed to a voice coil motor to a saturation current or lower even if the length to a target is a prescribed value or longer. CONSTITUTION:The length to a target position is given to start the seel operation, and an output signal is outputted to an offset generating circuit 4 from a discriminating circuit 5 if this length is longer than a prescribed length. The offset generating circuit 4 outputs an offset signal to a reference speed generating circuit 1. The offset signal controls displacement of a target speed curve of the target speed outputted from the reference speed generating circuit 1 so that the length to the target position is smaller than a prescribed value apparently. When the control rushes into a deceleration control section, a signal is outputted from a deceleration section detecting circuit 3 to the offset generating circuit 4, and the output of the offset signal is released, and the current flowed to a VCM7 is controlled by the speed error obtained from controlled target speed and actual speed to position accurately and quickly a recording/reproducing head (omitted in a figure) to the target position. |
