OPTICAL STORAGE DEVICE ROTATION SPEED CONTROL APPARATUS AND METHOD
First Claim
1. A method for controlling angular velocity of a spindle motor to rotate an optical disc in an optical disc reproduction apparatus, the optical disc reproduction apparatus having an optical pick-up to read information stored on the optical disc, the method comprising:
- generating a first control signal while in a first control mode, and generating a second control signal while in a second control mode;
when receiving the first control signal in the first control mode, sending a first pulse with a first control voltage and a second pulse with a second control voltage to the spindle motor, causing the spindle motor to produce a first armature current upon reception of the first pulse and produce a second armature current upon reception of the second pulse;
when receiving the second control signal in the second control mode, sending a third DC signal with a third control voltage to the spindle motor, causing the spindle motor to produce a third armature current upon reception of the DC signal;
sensing the first, the second, and the third armature currents, and outputting a first, a second, and a third test voltage corresponding to the first, the second, and the third armature currents;
using the first and the second control voltages and the first and second test voltages to obtain a motor coefficient of the spindle motor;
using the third control voltage, the motor coefficient, and the third test voltage to obtain a relative angular velocity of the spindle motor for controlling the angular velocity of the spindle motor.
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Accused Products
Abstract
A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sent to the motor, which causes the motor to produce a first armature current and a second armature current. In another mode, a DC signal of a third voltage is produced, which causes the motor to produce a third armature current. The armature currents are detected, and test voltages are outputted. The first and second voltages, and the first and second test voltages are used to find a motor coefficient. The third voltage, the motor coefficient, and the third test voltage are used to calculate a motor rotation speed. The calculated speed is used to control the real motor speed.
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Citations
12 Claims
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1. A method for controlling angular velocity of a spindle motor to rotate an optical disc in an optical disc reproduction apparatus, the optical disc reproduction apparatus having an optical pick-up to read information stored on the optical disc, the method comprising:
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generating a first control signal while in a first control mode, and generating a second control signal while in a second control mode;
when receiving the first control signal in the first control mode, sending a first pulse with a first control voltage and a second pulse with a second control voltage to the spindle motor, causing the spindle motor to produce a first armature current upon reception of the first pulse and produce a second armature current upon reception of the second pulse;
when receiving the second control signal in the second control mode, sending a third DC signal with a third control voltage to the spindle motor, causing the spindle motor to produce a third armature current upon reception of the DC signal;
sensing the first, the second, and the third armature currents, and outputting a first, a second, and a third test voltage corresponding to the first, the second, and the third armature currents;
using the first and the second control voltages and the first and second test voltages to obtain a motor coefficient of the spindle motor;
using the third control voltage, the motor coefficient, and the third test voltage to obtain a relative angular velocity of the spindle motor for controlling the angular velocity of the spindle motor. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for reproducing information on a disk-shaped information storing medium, comprising:
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a pick-up for reproducing information on the medium;
a spindle motor for rotating the medium;
a motor driving circuit for generating a first pulse with a first control voltage to the spindle motor and causing the spindle motor to produce a first armature current, generating a second pulse with a second control voltage to the spindle motor and causing the spindle motor to produce a second armature current, and generating a DC signal with a third voltage to the spindle motor and causing the spindle motor to produce a third armature current;
a sensor circuit for sensing the first, the second, and the third armature currents, and generating a first, a second, and a third test voltage corresponding to the first, the second, and the third armature currents, respectively;
wherein the first and the second test voltages are calculated to obtain a motor coefficient of the spindle motor; and
wherein the third control voltage, the motor coefficient, and the third test voltage are calculated to obtain a relative angular velocity of the spindle motor for controlling the angular velocity of the spindle motor. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for controlling angular velocity of a spindle motor to rotate an optical disc in an optical disc reproduction apparatus, the optical disc reproduction apparatus having an optical pick-up to read information stored on the optical disc, the method comprising:
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generating a first pulse with a first control voltage and a second pulse with a second control voltage to the spindle motor, causing the spindle motor to produce a first armature current upon reception of the first pulse and produce a second armature current upon reception of the second pulse;
generating a third DC signal with a third control voltage to the spindle motor, causing the spindle motor to produce a third armature current upon reception of the DC signal;
sensing the first, the second, and the third armature currents, and outputting a first, a second, and a third test voltage corresponding to the first, the second, and the third armature currents;
using the first and the second control voltages and the first and second test voltages to obtain a motor coefficient of the spindle motor;
using the third control voltage, the motor coefficient, and the third test voltage to obtain a relative angular velocity of the spindle motor for controlling the angular velocity of the spindle motor.
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Specification