Optical disk drive and method for controlling movement of optical pickup
AssigneeHitachi-LG Data Storage, Inc.
InventorsHajime Nishimura, Yoshihiro Fukagawa, Seiji Inaba
Life of this patent
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Abstract
A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Moreover, change of the sampling signal is obtained from a difference of the sampling signals by comparing these sampling signals at the first and second points. Comparison of these sampling signals is conducted in unit of drive pulse.
Claims12
An optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk through an optical pickup, comprising:
- a motor for moving said optical pickup almost in the radius direction of said optical disk;
- a motor drive circuit for driving said motor;
- a sampling circuit for forming a sampling signal by sampling a drive current or a drive voltage of said motor output from said motor drive circuit;
- and
- a control circuit for detecting change of said sampling signal and controlling said drive current or drive voltage based on a result of said detection;
- whereby, said movement of said optical pickup can be controlled by controlling said motor based on an information about change of said sampling signal.
An optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk through an optical pickup, comprising:
- a stepping motor for driving a feed mechanism to move said optical pickup almost in the radius direction of said optical disk;
- a motor drive circuit for driving said stepping motor;
- and
- a control circuit for forming a sampling signal in unit of stepping pulse by sampling a stepping pulse outputted from said motor drive circuit and controlling said motor drive circuit based on a result of comparison by comparing said sampling signals;
- whereby change of the stepping pulse is detected based on the comparison of sampling signals and said stepping motor is controlled corresponding to a load of said feed mechanism.
An optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk through an optical pickup, comprising:
- a stepping motor for driving a feed mechanism to move said optical pickup almost in the radius direction of said optical disk;
- a motor drive circuit for driving said stepping motor;
- a first control circuit for forming a sampling signal in unit of stepping pulse by sampling said stepping pulses outputted from said motor drive circuit, storing said sampling signals and comparing said sampling signals with each other;
- and
- a second control circuit for controlling said stepping pulses by controlling said motor drive circuit based on the result of said comparison;
- whereby, change of said stepping pulse is detected based on the comparison of said sampling signals and said stepping motor is controlled corresponding to a load of said feed mechanism.
An optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk through an optical pickup, comprising:
- a stepping motor for driving a feed mechanism for moving said optical pickup almost in the radius direction of said optical disk;
- a motor drive circuit for driving said stepping motor;
- a sampling circuit for forming a sampling signal in unit of stepping pulse by sampling said stepping pulse outputted from said motor drive circuit and averaging the result of said sampling;
- a storage circuit of storage medium for storing said sampling signals;
- a first control circuit for comparing said sampling signals with each other;
- and
- a second control circuit for controlling said motor drive circuit based on the result of said comparison;
- whereby, change of said stepping pulse is detected with comparison of said sampling signals and drive of said stepping motor is controlled corresponding to a load of said feed mechanism.
A method of controlling movement of an optical pickup of an optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk, comprising the steps of;
- sampling a drive current or a drive voltage of a motor to move said optical pickup almost in the radius direction of said optical disk and then forming a sampling signal;
- detecting change of said sampling signals;
- controlling said drive current or drive voltage of motor based on the result of said comparison;
- whereby, said motor is controlled corresponding to a load of said optical pickup when it is moved in order to control the movement of said optical pickup.
A method of controlling movement of an optical pickup of an optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk, comprising the steps of;
- sampling a drive pulse of a stepping motor to move said optical pickup almost in the radius direction of said optical disk and the forming a sampling signal in unit of said drive pulse;
- comparing said sampling signals with each other;
- detecting change of said drive pulse based on the result of said comparison;
- whereby, said stepping motor is controlled corresponding to a load of said optical pickup when it is moved in order to control the movement of said optical pickup.
A method of controlling movement of an optical pickup of an optical disk drive for conducting any one or both of the information recording and reproducing operations to and from an optical disk, comprising the steps of;
- sampling a drive pulse of a stepping motor to move said optical pickup almost in the radius direction of said optical disk and then forming a sampling signal in unit of said drive pulse;
- storing said sampling signals and comparing said sampling signals with each other;
- detecting change of said drive pulses based on the result of said comparison and controlling said drive pulses;
- and
- whereby, said stepping motor is controlled corresponding to a load of said optical pickup when it is moved in order to control the movement of said optical pickup.
Dependencies are inferred from the claim text.