System for constant angular velocity disk recording and method for laser power control thereof

A laser power control method for recording data on a disk under CAV (Constant Angular Velocity) control format where the existing recorded data is recorded with CLV (Constant linear Velocity) format, the disk inner tracks having a PCA (Power Calibration Area), the disk outer tracks further having a lead out area, the control method rotating under a fixed CAV control format and comprising:

• performing OPC (Optimal power Calibration) in the PCA and rendering a first optimum laser power of the disk inner tracks, detecting a corresponding first CLV value;
• performing OPC in the second half of the lead out area on the outer track area and rendering a second optimum laser power of the disk inner tracks, detecting a corresponding second CLV value;
• applying the first optimum laser power, the first CLV value, the second optimum laser power and the second CLV value and thereby creating a linear equation;
• using the linear equation and attaining a third optimum laser power based on a corresponding third CLV value;
• adjusting the recording laser power based on the third optimum laser power.

A laser power control method for recording data on a disk under CAV (Constant Angular Velocity) control format where the existing recorded data is recorded with CLV (Constant linear Velocity) format, the disk inner tracks area having a PCA (Power Calibration Area), the control method comprising:

• rotating the disk under a first fixed multiple CLV control format;
• performing OPC (Optimal power Calibration) in the PCA and rendering a first optimum laser power of the disk inner tracks area, detecting a corresponding first CLV value;
• rotating the disk under a second fixed multiple CLV control format;
• performing OPC in the PCA and rendering a second optimum laser power of the disk inner tracks, detecting a corresponding second CLV value;
• applying the first optimum laser power, the first CLV value, the second optimum laser power, and the second CLV value and thereby creating an linear equation;
• rotating the disk under a fixed CAV control format;
• using the linear equation and attaining a third optimum laser power based on a corresponding third CLV value;
• and
• adjusting the recording laser power based on the third optimum laser power.

A system using CAV (Constant Angular Velocity) control format for recording data on a disk where the existing recorded data is recorded with CLV (Constant Linear Velocity) format, the system comprising:

• a PUH (Pick-Up Head), reading and recording on the disk;
• a laser driver, generating and outputting a laser driver signal to the PUH for causing the PUH to generate a wobble signal, the wobble signal reflected by the optical disk and then read by the PUH;
• a write pulse generator, generating a write pulse signal to control the laser driver signal of the laser driver;
• an ATIP (Absolute Time In Pre-grooves) decoder, collecting the wobble signal from the PUH and generating an ATIP decoded data;
• a clock synthesizer, generating a clock signal according to the ATIP decoded data and providing the clock signal to the write pulse generator.

A system using CAV (Constant Angular Velocity) control format for recording data on a disk where the existing recorded data is recorded with CLV (Constant Linear Velocity) format, the system comprising:

• a PUH (Pick-Up Head), reading and recording on the disk;
• a laser driver, generating and outputting a laser driver signal to the PUH for causing the PUH to generate a feed signal and a wobble signal, the wobble signal reflected by the optical disk and then read by the PUH;
• an automatic power control, receiving the feed signal and generating a first control signal used for causing the laser driver to adjust the laser driver signal;
• an ATIP (Absolute Time In Pre-grooves) decoder, collecting the wobble signal and generating ATIP decoded data;
• a CLV value detector, receiving the ATIP decoded data and generating CLV decoded data;
• and
• a laser power control, receiving the CLV decoded data and generating a second control signal, which is used for causing the automatic power control to adjust the first control signal.

A system using CAV (Constant Angular Velocity) control format for recording data on a disk where the existing recorded data is recorded with CLV (Constant Linear Velocity) format, the system comprising:

• a PUH (Pick-Up Head), reading and recording on the disk;
• a laser driver, generating and outputting a laser driver signal to the PUH for causing the PUH to generate a wobble signal, the wobble signal reflected by the optical disk and then read by the PUH;
• a write pulse generator, generating a write pulse signal to control the laser driver signal of the laser driver;
• an ATIP (Absolute Time In Pre-grooves) decoder, collecting the wobble signal from the PUH and generating ATIP decoded data;
• a CLV value detector, receiving the ATIP decoded data and generating CLV decoded data;
• and
• a dynamic write strategy table, receiving the CLV decoded data, providing a third control signal, and causing the write pulse generator to adjust the write pulse signal according to the third control signal.