Method and apparatus for controlling the rotation of a turntable which is capable of instantly and accurately moving a disc mounting unit regardless of rotation speed variation or aging of parts

A method for controlling the rotation of a turntable in order to move a disk mounting portion selected among a plurality of disk mounting portions installed on a turntable, to a pickup side by a key input signal of a user, which comprises

• rotating the turntable by supplying a driving voltage to a turntable driving motor;
• sensing the rotation velocity of the turntable, and varying an output delay time of the motor driving voltage for stopping the pertinent disk mounting portion on a reproducing position on the basis of the sensed rotation velocity of the turntable;
• and
• cutting off the output of the driving voltage to the motor.

A method for controlling the rotation of a turntable in order to move a disk mounting portion selected from among a plurality of disk mounting portions formed on the turntable to a reproducing position in the turntable by a key input signal of a user, including a plurality of ribs and slots for discriminating the position of the disk mounting portion, said method comprising:

• rotating the turntable by supplying a driving voltage to a motor;
• extracting an output delay time Td by sensing a time when one of said plurality of ribs or slots passes;
• detecting a signal indicative of the rib or slot passage, and counting a time T from a point in time when a high signal is converted into a low signal;
• and
• stopping supply of the driving voltage when T=Td after comparing the Td and T values.

An apparatus for controlling the rotation of a turntable in order to move a disk mounting portion selected from among a plurality of disk mounting portions formed on the turntable to a reproducing position, comprising:

• a key input unit for generating a key signal by a key input inputted from a user;
• a sensor unit for generating a pulse signal by a position sensing mechanism;
• a control unit for measuring a rotational velocity of the turntable by inputting the pulse signal of the sensor unit, adjusting a driving voltage acting time to a turntable driving motor in accordance with a measured rotational velocity, and outputting a stop command control signal about the driving voltage of the turntable driving motor;
• and
• a driving unit for driving the turntable driving motor by generating the driving voltage in accordance with the stop command control signal from the control unit;
• said turntable being adapted to be moved to the reproducing position accurately regardless of a variation in the rotational velocity due to a variation in load quantity.

A method for controlling the rotation of a turntable in order to move a disk mounting portion selected from among a plurality of disk mounting portions formed on the turntable to a reproducing position by a key input signal of a user, said turntable including a sensing device for discriminating the position of the disk mounting position, said method comprising:

• rotating the turntable by supplying a driving voltage to a motor;
• extracting an output delay time Td by sensing a rotation time of the turntable;
• judging a signal from the sensing device, and counting a time T from a high/low signal transition point;
• and
• stopping supply of the driving voltage when T=Td after comparing the Td and T values.