Optical disk apparatus and recording parameters setting method

Abstract

An optical disk apparatus and a recording parameters setting method are provided to more effectively execute recording parameter learning during data recording on the optical disk, thereby shortening the time required for setting an optimum recording parameter. A phase error detection unit detects a phase error amount from a reproduction signal of actual data being recorded. A phase error adjustment unit adjusts recording parameters (recording strategy) set by a recording parameters setting unit based on the detected phase error amount. The phase error amount detection is executed simultaneously with a verify process of the actual data. If a verify process judgment results says that a target quality is not attained, test writing by a test signal is not executed but the adjustment of recording parameters is conducted on the basis of the phase error amount.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing an optical disk apparatus according to one embodiment of the present invention;

FIG. 2 is a diagram explaining the operations of a phase error detection unit and a phase error adjustment unit in FIG. 1;

FIGS. 3A to 3C illustrate an example of a table listing phase error measurement results and recording strategy adjustment;

FIG. 4 is a flowchart describing an example of data recording according to a conventional recording parameters setting method; and

FIG. 5 is a flowchart explaining an embodiment of data

FIG. 5 is a flowchart explaining an embodiment of data recording according to a recording parameters setting method of the present invention.

Claims

1. An optical disk apparatus capable of adjusting recording parameters of a laser beam when recording data by irradiation of a laser beam onto an optical disk, the apparatus comprising: a spindle motor which rotates the optical disk;a pickup which irradiates the laser beam onto the optical disk and records and reproduces the data;a signal processing unit which generates a record signal of the data, supplies the signal to the pickup, and generates a reproduction signal of the data from a detection signal of the pickup;a recording parameters setting unit which sets the recording parameters when the pickup records the data;a recording quality judgment unit which judges recording quality from the reproduction signal generated by the signal processing unit;a phase error detection unit which detects a phase error amount from the reproduction signal generated by the signal processing unit;a phase error adjustment unit which adjusts the recording parameter set by the recording parameters setting unit on the basis of the phase error amount detected by the phase error detection unit;a memory which stores the recording parameter set by the recording parameters setting unit when the data is recorded; anda control unit which controls the data recording and reproducing operations and the recording parameter setting operation,wherein, when the memory already stores recording parameters, the control unit does not execute test writing but initially sets a recording parameter referring to the stored recording parameter, records the data in predetermined unit in a data recording region on the optical disk, reproduces the recorded data to judge recording quality thereof with the recording quality judgment unit and simultaneously, executes detection of a phase error amount with the phase error detection unit, and adjusts the recording parameter by the phase error adjustment unit based on the phase error amount detected by the phase error detection unit if a judgment result of the recording quality judgment unit verifies that a target quality is not satisfied.

2. The optical disk apparatus according to claim 1, wherein the control unit records the data in predetermined unit and reproduces the recorded data in the predetermined unit, and executes a verify process judging the quality of a reproduction signal by recording quality judgment unit.

3. The optical disk apparatus according to claim 1, wherein the recording parameters setting unit executes a test writing process, through which test signals under various recording parameters are recorded in a test writing region on the optical disk and the recorded test signals are reproduced so as to obtain an optimum signal parameter; wherein, the control unit initially sets a recording parameter by executing the test writing process with the recording parameters setting unit when a new data is to be recorded, andthe control unit does not execute the test writing process but executes adjustment of the recording parameter by the phase error adjustment unit based on the phase error amount detected by the phase error detection unit, in the case that the data recording quality is not equated to the target quality according to the judgment result provided from the recording quality judgment unit.

4. The optical disk apparatus according to claim 1, wherein the phase error detection unit combines a mark length and a space length included in the data, respectively, and measures a shift amount of a mark edge position per pattern; and the phase error adjustment unit adjusts for each of the patterns a power level or an irradiation timing of the laser beam set by the recording parameters setting unit, so as to compensate the measured shift amount.

5. A recording parameters setting method during data recording by irradiation of a laser beam onto an optical disk, the method comprising the steps of: storing a recording parameter set during the data recording in a memory or in a predetermined area of the corresponding optical disk;if the memory or the optical disk already stores recording parameters, not executing a test writing process but initially setting a recording parameter referring to the stored recording parameters, and reproducing the data which is recorded in the data recording region on the optical disk;detecting a phase error amount from a reproduction signal obtained by reproducing the data; andadjusting recording parameters of the laser beam for use in recording the data, on the basis of the detected phase error amount.

6. A recording parameters setting method during data recording by irradiation of a laser beam onto an optical disk, the method comprising the steps of: storing a recording parameter set during the data recording in a memory or in a predetermined area of the corresponding optical disk;if the memory or the optical disk already stores recording parameters, not executing a test writing process but initially setting a recording parameter referring to the stored recording parameters, recording the data in predetermined unit in a data recording region on the optical disk, reproducing the data, and conducting a recording quality judgment process judging recording quality from the reproduction signal obtained by reproducing the recorded data;detecting a phase error amount from the reproduction signal simultaneously with the recording quality judgment process; andif target quality is not attained according to a recording quality measurement result, adjusting recording parameters of the laser beam for use in recording the data, on the basis of the detected phase error amount.

7. The recording parameters setting method according to claim 6, wherein the recording quality judgment process is a verify process which records the data in predetermined unit, reproduces the recorded data per predetermined unit, and judges the quality of a reproduction signal per predetermined unit.

8. The recording parameters setting method according to claim 6, wherein a test writing process is executed, through which test signals under various recording parameters are recorded in a test writing region on the optical disk and the recorded test signals are reproduced so as to obtain an optimum signal parameter; wherein a recording parameter is initially set by executing the test writing process when a new data is to be recorded, andthe test writing process is not executed but adjustment of the recording parameter is executed based on the phase error amount detected, in the case that the data recording quality is not equated to the target quality according to a judgment result provided from the recording quality judgment process.

9. The recording parameters setting method according to claim 6, wherein, in the phase error detection process, a mark length and a space length included in the data are combined, respectively, and a shift amount of a mark edge position is measured per pattern; andin the recording parameter adjustment process, a power level or an irradiation timing of the laser beam at the time of recording is adjusted for each of the patterns, so as to compensate the measured shift amount.