Patent ID: 6326749
Filing Date: 2001-12-04
Classification: G11B

Abstract:
A motor rotation control device that controls a motor in an optical disk player, comprising:a motor rotational direction sensor that receives a plurality of rotation signals regarding rotation of the motor and determines the rotational direction of the motor by detecting a phase difference between at least two of the rotation signals, said motor rotational direction sensor generating a forward rotation signal during the forward rotation of said motor and a backward rotation signal during the backward rotation of said motor;a motor rotational state sensor that receives one of the rotational signals and counts the period of the received rotational signal, said motor rotational state sensor outputting a normal driving signal, if the counted period is within a normal driving interval, a forward driving signal if the counted period is within a forward accelerated interval, a backward driving signal if the counted period is within a backward accelerated interval, or an explosive signal if the counted period is within an explosive interval;a forward acceleration enable signal generator that generates a forward acceleration enable signal when a forward rotation signal and a forward acceleration signal are simultaneously output or when a backward rotation signal is output; anda normal driving enable signal generator that generates a backward acceleration enable signal when an explosive signal has been outputted while said forward rotation signal is outputted until a backward acceleration signal is output.