| 摘要 |
The present invention provides a disk playback device comprising a laser drive circuit 15 for feeding a drive signal to an optical head 4 and adjusting the power of a laser beam irradiated by the optical head 4, an error correcting circuit 11 for detecting an error rate of a reproduced signal, and a system controller 10 for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correction circuit 11. The system controller 10 retrieves one limit value of two limit values of a reproduction power wherein the error rate is not beyond a prescribed value, and calculates an optimum reproduction power based on the one limit value retrieved. Accordingly it is possible to move to signal reproduction in a short period of time and to reproduce signals with high accuracy by setting the optimum reproduction power. <IMAGE>
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