Optical disk apparatus and test writing method

Abstract

Test writing is executed while skipping areas where deviations are present on an optical disk to thereby improve accuracy and reliability of an optimum recording condition to be derived. A deviation detecting unit detects the deviations of a guide groove on the optical disk on the basis of a fluctuation amount of a focus error signal or a tracking error signal, and registers information of the detected deviations onto a memory. A test writing processing unit refers to the memory, and records and reproduces a test signal while skipping the areas where the deviations are detected.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 2 is a diagram illustrating occurrence and detection of deviations;

FIG. 3 is a diagram illustrating a method of performing test writing while skipping the deviations;

FIG. 4 is a flowchart showing an example of a test writing process; and

FIG. 5 is a flowchart showing another example of the test writing process.

Claims

1. An optical disk apparatus for adjusting a recording condition by test writing when a laser beam is irradiated on an optical disk for recording data, the apparatus comprising: a spindle motor which rotates the optical disk;a pickup which irradiates the laser beam on test writing areas of the optical disk to record and reproduce a test signal;a signal processing unit which obtains a reproduced signal of the test signal, and a focus error signal or a tracking error signal from a signal detected by the pickup;a deviation detecting unit which detects deviations of a guide groove on the optical disk on the basis of a fluctuation amount of the obtained focus error signal or tracking error signal; anda test writing processing unit which supplies the test signal to the pickup and assessing the quality of the reproduced signal of the test signal that is obtained by the signal processing unit to adjust the recording condition,wherein the test writing processing unit records the test signal while skipping areas where the deviations are detected by the deviation detecting unit, and reproduces the test signal while skipping the areas.

2. The optical disk apparatus according to claim 1, further comprising a memory on which information about the deviations detected by the deviation detecting unit is registered, wherein the test writing processing unit interrupts the recording and reproducing of the test signal in the areas where the deviations are detected by referring to the information about the deviations registered on the memory.

3. The optical disk apparatus according to claim 1, wherein the information about the deviations detected by the deviation detecting unit is registered in a predetermined area on the optical disk, andthe test writing processing unit interrupts the recording and reproducing of the test signal at the areas where the deviations are detected by referring to the information about the deviations registered on the optical disk.

4. The optical disk apparatus according to claim 1, wherein the deviation detecting unit samples the focus error signal or the tracking error signal at predetermined intervals to detect the deviations on the basis of a difference value between adjacent sampled values.

5. A test writing method for adjusting a recording condition when a laser beam is irradiated on an optical disk for recording data, the method comprising the steps of: obtaining a focus error signal or a tracking error signal from areas on the optical disk where test writing is performed;detecting deviations of a guide groove on the optical disk on the basis of a fluctuation amount of the obtained focus error signal or tracking error signal;recording a test signal while skipping areas where the deviations are detected, and reproducing the test signal while skipping the areas; andassessing the quality of the reproduced test signal to adjust the recording condition.

6. The test writing method according to claim 5, further comprising the steps of: registering information about the detected deviations on a memory; andinterrupting the recording and reproducing of the test signal in the areas where the deviations are detected by referring to the information about the deviations registered on the memory.

7. The test writing method according to claim 5, further comprising the steps of: registering information about the detected deviations in a predetermined area of the optical disk; andinterrupting the recording and reproducing of the test signal in the areas where the deviations are detected by referring to the information about the deviations registered on the optical disk.

8. The test writing method according to claim 6, further comprising the steps of: performing the detection of the deviations and the recording of the test signal in parallel;when the deviations are detected, registering the information about the detected deviations on the memory while interrupting the recording of the test signal in the areas; andinterrupting the reproducing of the test signal in the areas where the deviations are detected by referring to the memory.