Optical disc drive and recording method

An optical disc drive comprising:

• a recording start address detector configured to detect a recording start address;
• a recording speed calculator configured to calculate a recording speed according to the recording start address detected by the recording start address detector;
• a first register configured to store a write strategy calculated by carrying out an interpolation process to a preset write strategy corresponding to the recording speed;
• a second register configured to store a recording power coefficient that is calculated based on an optimum recording power value obtained by a calibration, the calibration being executed when a recording instruction is received;
• a recording power calculator configured to calculate a recording power value at the recording start address corresponding to the recording speed calculated by the recording speed calculator, and the recording power coefficient stored in the second register;
• and
• a recording controller configured to control a recording process for writing recording user data, and to perform writing a first part of the recording user data from the recording start address to a micro address on the optical disc by using the recording speed calculated by the recording speed calculator, the strategy stored in the first register and the recording power value calculated by the recording power calculator,
• wherein the recording controller is configured to suspend the recording process after the writing the first part of the recording user data, to acquire an asymmetry value or a β value calculated by using the reproducing signal of the first part of the recording user data which is recorded before the suspending, and comparing, in a first comparing, the absolute value difference between the asymmetry value or the β value and a preset target value,
• the recording controller is configured to perform a first adjusting process so that the absolute value is adjusted to less than a first predetermined value when the absolute value is not less than the first predetermined value in the first comparing, the first adjusting process including calculating a new recording power coefficient, updating the recording power coefficient stored in the second register using the new recording power coefficient, adjusting the recording power using the updated recording power coefficient, writing the first part of the recording user data from the recording start address at which the recording process is suspended to a micro address on the optical disc using the adjusted recording power, suspending the recording process after writing the first part of the recording user data, and reproducing the first part of the recording user data;
• the recording controller is configured to acquire a correction amount of write strategy calculated from a reproducing signal at a location recorded when it is determined that the absolute value is less than the first predetermined value in the first comparing,
• the recording controller is configured to acquire, when the correction amount is within a second predetermined value, recording speed at a joint recording start address corresponding to a specified recording mode, the write strategy stored in the first register based on the recording speed, and recording power based on the recording speed at the joint recording start address, to restart the recording process for writing a second part of the recording user data from the recording start address to a micro address on the optical disc, to suspend a recording process after writing the second part of the recording user data, and to reproduce the second part of the recording user data recorded in the optical disc,
• the recording controller is configured to suspend the recording process after the writing the second part of the recording user data, to acquire an asymmetry value or a β value calculated by using the reproducing signal of the second part of the recording user data which is recorded before the suspending, and to compare an absolute difference between the asymmetry value or the β value and the preset target value in a second comparing,
• the recording controller is configured to perform a second adjusting process so that the absolute value is adjusted to less than the first predetermined value when the absolute value is not less than the first predetermined value in the second comparing, the second adjusting process including calculating a next new recording power coefficient, updating the recording power coefficient stored in the second register using the next new recording power coefficient to adjust the recording power using the updated recording power coefficient, writing the second part of the recording user data from the recording start address at which the recording process is suspended to a micro address on the optical disc using the adjusted recording power, suspending the recording process after the writing the second part of the recording user data, and reproducing the second part of the recording user data;
• the recording controller is configured to acquire, when the absolute value is less than the first predetermined value in the second comparing, a correction amount of write strategy calculated from a reproducing signal at a location recorded just before the suspending of the recording process, and to restart the recording process using by the write strategy stored in the first register and the recording power value acquired based on the recording speed at a joint recording start address when the correction amount is within the second predetermined value.

A recording method comprising:

• detecting an address to start recording on an optical disc;
• calculating a recording speed according to the recording start address;
• storing a write strategy calculated by carrying out an interpolation process to a preset write strategy corresponding to the recording speed in a first register:
• calculating a recording power value at the recording start address corresponding to a recording power coefficient stored in a second register and the recording speed, the recording power coefficient being calculated based on an optimum recording power value obtained by a calibration, the calibration being executed when a recording instruction is received;
• performing a recording process for writing recording user data, the recording process including writing a part of the recording user data from the recording start address to a micro address on the optical disc by using the calculated recording speed, the write strategy stored in the first register, and the calculated recording power value;
• suspending the recording process after the writing part of the recording user data, acquiring an asymmetry value or β value calculated by using the reproducing signal of the part of recording user data, and comparing an absolute difference between the asymmetry value or the β value and preset target value;
• performing an adjusting process so that the absolute value is adjusted to less than a first predetermined value when the absolute value is not less than the first predetermined value, the adjusting process including calculating a new recording power coefficient, updating the recording power coefficient stored in the second register using the new recording power coefficient to adjust the recording power using the updated recording power coefficient, writing the part of the recording user data from the recording start address at which the recording process is suspended to a micro address on the optical disc using the adjusted recording power, suspending the recording process after the writing the part of the recording user data, and reproducing the part of the recording user data;
• acquiring, when the absolute value is not less than the first predetermined value, a correction amount of write strategy calculated from a reproducing signal at a location recorded just before suspending of the recording process, and restarting, when the correction amount is within a second predetermined value, the recording process for writing a remaining of recording user data starting to record non-recording user data using the write strategy stored in the first register and the calculated recording power value.

A recording method comprising:

• detecting an address to start recording on an optical disc;
• calculating a recording speed according to the recording start address;
• storing a write strategy calculated by carrying out a interpolation process to a preset write strategy corresponding to the recording speed in a first register;
• calculating a recording power value at the recording start address corresponding to a recording power coefficient stored in a second register and the recording speed, the recording power coefficient being calculated based on an optimum recording power value obtained by a calibration, the calibration being executed when a recording instruction is received;
• performing a recording process for writing recording user data, the recording process including writing a first part of the recording user data from the recording start address to a micro address on the optical disc by using calculated recording speed, the write strategy stored in the first register, and the calculated recording power value;
• suspending the recording process after the writing the first part of the recording user data, acquiring an asymmetry value or a β value calculated by using the reproducing signal of the first part of the recording user data, and comparing, in a first comparing, an absolute value of difference between the asymmetry value or the β value and preset target value;
• performing a first adjusting process so that the absolute value is less than a first predetermined value when the absolute value is not less than the first predetermined value in the first comparing, the first adjusting process including calculating a new recording power coefficient, updating the recording power coefficient stored in the second register using the new recording power coefficient, adjusting the recording power using the updated recording power coefficient, writing the first part of the recording user data from the recording start address at which the recording process is suspended to a micro address on the optical disc using the adjusted recording power, suspending the recording process after the writing the first part of the recording user data, and reproducing the first part of the recording user data;
• acquiring a correction amount of write strategy calculated from a reproducing signal at a location recorded just before the suspending of the recording process when the absolute value is not less than the first predetermined value in the first comparing;
• acquiring, when the correction amount is within a second predetermined value, recording speed at a joint recording start address corresponding to a specified recording mode, the write strategy stored in the first register based on the recording speed, and recording power based on the recording speed at a joint recording start address, restarting the recording process for writing a second part of the recording user data from the recording start address to a micro address on the optical disc, to suspending a recording process after writing the second part of the recording user data, and reproducing the second part of the recording user data recorded in the optical disc;
• acquiring an asymmetry value or a β value calculated by using the reproducing signal of the second part of the recording user data which is recorded before the suspending, and comparing, in a second comparing, an absolute value of difference between the asymmetry value or the β value and preset target value;
• performing a second adjusting process so that the absolute value is adjusted to less than the first predetermined value when the absolute value is not less than the first predetermined value in a second comparing, the second adjusting process including calculating a next new recording power coefficient, updating the recording power coefficient stored in the second register using the next new recording power coefficient, adjusting the recording power using the updated recording power coefficient, writing the second part of the recording user data from the recording start address at which the recording process is suspended to a micro address on the optical disc using the adjusted recording power, suspending the recording process after the writing the second part of the recording user data, and reproducing the second part of the recording user data;
• acquiring, when the absolute value is not less than the first predetermined value in the second comparing, a correction amount of write strategy calculated from a reproducing signal at a location recorded just before the suspending of the recording process, and restarting, when the correction amount is within the second predetermined value, the recording process using by the write strategy stored in the first register and the recording power value acquired based on the recording speed at the recording start address.