Method and apparatus for controlling the rotation of a turntable

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 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 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 among a plurality of disk mounting portions formed on the turntable to a reproducing position by a key input signal of a user in the turntable, including a plurality of ribs and slots for discriminating the position of the disk mounting portion, which comprises

• rotating the turntable by supplying a driving voltage to a motor;
• extracting an output delay time Td by sensing a time when the rib or slot passes;
• judging a signal informing of the rib or slot passage, and counting the time T from the point in time when the high signal is converted into a low signal;
• and
• stopping the driving of the motor when T=Td after comparing the Td and T value.

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

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