Disk reproducing speed control method and a disk reproducing apparatus using the same

A method of controlling an operation of a disk apparatus wherein a disk is rotated to at least one of read and write information from and to the disk by a member driven by an actuator and movable with respect to the disk, said method comprising the steps of:

• monitoring a parameter of the actuator when the disk is rotated at a present rotating speed, and outputting an output corresponding thereto;
• comparing the output of the parameter of the actuator to determine whether the output is within a predetermined range;
• and
• when the output of the parameter is within the predetermined range, continuing to rotate the disk at the present rotating speed, and when the output of the parameter is not within the predetermined range, changing the present rotating speed to a new rotating speed;
• wherein the output of the parameter of the actuator is indicative of at least one of a rotational eccentricity and planar vibration of the rotating disk at a present rotating speed, and the predetermined range is more specifically a predetermined acceptable range of at least one of an acceptable rotational eccentricity and an acceptable planar vibration of the rotating disk, and wherein if the output of the parameter is not within the predetermined acceptable range, changing the present rotating speed to a lower rotating speed;
• wherein the output of the parameter of the actuator more specifically corresponds to at least one of a present operating voltage, a present operating current and a present operating temperature of the actuator.

A method of controlling an operation of a disk apparatus wherein a disk is rotated to at least one of read and write information from and to the disk by a member driven by an actuator and movable with respect to the disk, said method comprising the steps of:

• monitoring a parameter of the actuator when the disk is rotated at a present rotating speed, and outputting an output corresponding thereto;
• comparing the output of the parameter of the actuator to determine whether the output is within a predetermined range;
• and
• when the output of the parameter is within the predetermined range, continuing to rotate the disk at the present rotating speed, and when the output of the parameter is not within the predetermined range, changing the present rotating speed to a new rotating speed;
• wherein the output of the parameter of the actuator is indicative of at least one of a rotational eccentricity and planar vibration of the rotating disk at a present rotating speed, and the predetermined range is more specifically a predetermined acceptable range of at least one of an acceptable rotational eccentricity and an acceptable planar vibration of the rotating disk, and wherein if the output of the parameter is not within the predetermined acceptable range, changing the present rotating speed to a lower rotating speed;
• and
• wherein a microprocessor is used to perform at least the comparing, continuing and changing steps.

An apparatus having a disk rotated to at least one of read and write information from and to the disk, comprising:

• a member driven by an actuator and movable with respect to the disk, to at least one of read and write information from and to the disk;
• a monitoring device monitoring a parameter of the actuator when the disk is rotated at a present rotating speed, and outputting an output corresponding thereto;
• a comparator device comparing the output of the parameter of the actuator to determine whether the output is within a predetermined range;
• and
• a control device which, when the output of the parameter is within the predetermined range, continues to rotate the disk at the present rotating speed, and when the output of the parameter is not within the predetermined range, changes the present rotating speed to a new rotating speed.

An apparatus having a disk rotated to at least one of read and write information from and to the disk, comprising:

• a member driven by an actuator and movable with respect to the disk, to at least one of read and write information from and to the disk;
• a monitoring device monitoring a parameter of the actuator when the disk is rotated at a present rotating speed, and outputting an output corresponding thereto;
• a comparator device comparing the output of the parameter of the actuator to determine whether the output is within a predetermined range;
• and
• a control device which, when the output of the parameter is within the predetermined range, continues to rotate the disk at the present rotating speed, and when the output of the parameter is not within the predetermined range, changes the present rotating speed to a new rotating speed;
• wherein the output of the parameter of the actuator is indicative of at least one of a rotational eccentricity and planar vibration of the rotating disk at a present rotating speed, and the predetermined range is more specifically a predetermined acceptable range of at least one of an acceptable rotational eccentricity and an acceptable planar vibration of the rotating disk, and wherein if the output of the parameter is not within the predetermined acceptable range, changing the present rotating speed to a lower rotating speed;
• wherein the output of the parameter of the actuator more specifically corresponds to at least one of a present operating voltage, a present operating current and a present operating temperature of the actuator.

An apparatus having a disk rotated to at least one of read and write information from and to the disk, comprising:

• a member driven by an actuator and movable with respect to the disk, to at least one of read and write information from and to the disk;
• a monitoring device monitoring a parameter of the actuator when the disk is rotated at a present rotating speed, and outputting an output corresponding thereto;
• a comparator device comparing the output of the parameter of the actuator to determine whether the output is within a predetermined range;
• and
• a control device which, when the output of the parameter is within the predetermined range, continues to rotate the disk at the present rotating speed, and when the output of the parameter is not within the predetermined range, changes the present rotating speed to a new rotating speed;
• wherein the output of the parameter of the actuator is indicative of at least one of a rotational eccentricity and planar vibration of the rotating disk at a present rotating speed, and the predetermined range is more specifically a predetermined acceptable range of at least one of an acceptable rotational eccentricity and an acceptable planar vibration of the rotating disk, and wherein if the output of the parameter is not within the predetermined acceptable range, changing the present rotating speed to a lower rotating speed;
• wherein the monitoring device, comparator device and control device are provided by a microprocessor.

A disk reproducing apparatus comprising:

• an information read section for reading information recorded on a disk;
• an actuator section for performing focusing and/or tracking control on said information read section;
• a switching control device for switching a disk reproducing speed between a first reproducing speed and a second reproducing speed that is lower than said first reproducing speed depending on information associated with an operating variable of said actuator section;
• wherein, if the information associated with said operating variable is smaller than a predetermined value, said disk is reproduced by setting the disk reproducing speed to said first reproducing speed and, if the information associated with said operating variable is greater than said predetermined value, said disk is reproduced by setting the disk reproducing speed to said second reproducing speed.