| 摘要 |
<p>PURPOSE:To reduce the operating noise level of a drive system by modulating the voltage applied to a loading motor into the prescribed pulse width when the drive system is switched and then controlling the revolution of the motor. CONSTITUTION:The voltage applied to a loading motor is modulated into the prescribed pulse width when a drive system is switched, and the revolution of the motor is controlled. Thus the rotational frequency of the loading motor can be decreased when the drive system is switched. At the same time, the force necessary for switch of the drive system is secured. Thus it is possible to surely suppress such mechanical noises as those impact noises produced when the modes are switched by a planet gear and produced when a tape cassette is ejected.</p> |
