To solve the problem that, if a drive of sufficient margin is performed to a load by a loading mechanism, such as a DVD recorder, etc., high-class feeling is spoiled, such as, the movement of a tray, etc. becomes excessively quick, an uncomfortable impact sound occurs at a clamping time, etc.; and if it drives so that it may become, on the contrary, a proper speed, it is stopped by a load change.
A motor is pulse driven by a pulse having a wider width than an electric time constant of the motor and a high voltage or a pulse train of a Duty ratio in which the effective voltage weight averaged serves as likely speed to the tray or a clamping operation, becoming a suitable speed. In this drive, since the peak drive voltage is high, it is strong against a frictional load. Since the effective voltage is a value becoming a suitable speed, the tray or the clamping operation does not become excessively fast to generate an uncomfortable noise, nor the high-class feeling is spoiled.
Tomoyasu Sakaguchi
Hiroki Naito