JP2000311346A - Optical disk recording and reproducing device and optimum power value deciding method for optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable laser outputs in recording to be adjusted to optimum recording powers with respect to data areas where information are to be written in the case of recording information on an optical disk which is additionally writable or rewritable and which has multilayered structure. SOLUTION: When information are to be recorded to an optical disk 1 in which a data area where is to be used for recording information and a trial writing area where is to be used for deciding the optimum recording power value of the luminous power of a laser beam in the reproduction are provided at positions different with each other on each layer of recording surfaces having multilayered structure by the control of an operation control unit 9, an optimum recording power is to be found by performing trial write with recording powers to the data area where the information are to be recorded and to the trial area of the same area as that of the data area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording information on an optical disc having a multilayer structure by using a laser beam.
Find the optimum recording power value for the data area of each layer,
The present invention relates to an optical disk recording / reproducing apparatus for recording information at the optimum recording power value and a method for determining an optimum recording power value of an optical disk for obtaining an optimum recording laser power when recording information on an optical disk having a multilayer structure.

[0002]

2. Description of the Related Art Conventionally, a means for measuring a control offset value for each of a groove portion and a land portion of an optical disk medium having a two-layer structure and storing the measured value of the control offset is provided. An optical disk recording / reproducing apparatus that optimizes a control offset value depending on the irradiation position (for example, see Japanese Patent Application Laid-Open No. 9-2315).
No. 88).

Further, in order to record, reproduce, or erase with a light beam of appropriate power on each recording layer of a multilayer recording medium having a plurality of recording layers, a test writing operation is performed for each information track at each radial position. There has been an optical disk recording / reproducing apparatus (see, for example, Japanese Patent Application Laid-Open No. H11-3550) which checks the reproduction signal to determine the optimum light beam conditions for recording, erasing or reproducing information on each information track. .

At present, in the field of optical disks, various types of optical disks (for example, CD-
R, DVD-R and other write-once optical disks, CD-RW, D
Rewritable optical disks such as VD-RAMs) are increasing.

[0005] Optical discs on which information can be recorded in this manner include optical discs of different types of optical disc compositions (eg, dye-change optical discs, phase-change optical discs, etc.).

There is also an optical disk having a different recording layer structure. For example, an optical disk, which has been a single-layer recording layer, has been changed to an optical disk having a two-layer structure, and the number of recording layers has been increased, and the structure of the optical disk has become more complicated.

However, if the recording layer has a two-layer structure, the recording capacity can be expected to increase more than before, and it is very useful for an optical disc aiming at increasing the capacity.

[0008] In an optical disc having a multi-layered recording surface including an optical disc having such a two-layer structure, various recording settings performed on a single-layer optical disc when information is additionally recorded or rewritten are described below. The same must be done for optical disks having a multilayer structure.
One of the settings is to determine and correct the optimum recording power value of the laser output for recording information.

[0009]

However, an optical disk having a multilayer structure has different characteristics on the information recording surface as compared with an optical disk having a single-layer structure. There is a problem that the processing of a different method must be used, and cannot be realized by the above-described conventional optical disk recording apparatus.

[0010] Here, the main features of the optical disk having a multilayer structure will be described. In an optical disk having a multilayer structure, since the recording layers may be overlapped in several layers, a higher recording surface (a surface closer to the disk surface). Of the recording surface) is kept low.

Further, the transmittance is set high so that the laser beam reaches the recording surface of the lower layer. In addition, since the recording marks (pits) are slightly larger, the recording mark density for one layer is lower.

Therefore, when recording information on a higher-order recording surface, it is necessary to adjust the laser power at the time of recording so that a correct recording mark can be formed.

The reason why the laser output at the time of recording is corrected to the optimum recording power value is the same as in the case of a single-layer optical disc, and the optimum recording power control (OPC: Optimal Power Control) of the laser irradiated when recording information is performed.
If (troll) is not performed, when information recorded on an optical disk is reproduced after information is recorded, jitter increases, and there is a possibility that accurate information reproduction may not be performed.

Therefore, when reproducing the recorded information,
In order to perform the accurate reproduction while minimizing the jitter, it is necessary to control the laser beam to the optimum recording power in accordance with the characteristics of the data area in which the information is to be written. And
Controlling the recording light emission power is one of the very effective methods for suppressing the reproduction jitter, so that the optimum recording power value is corrected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when information is recorded on an optical disk having a multi-layered structure that can be written on or rewritten, the information is recorded on a data area of a layer on which information is written. The purpose is to be able to adjust the laser output of the laser to the optimum recording power value

[0016]

According to the present invention, there is provided a data area for recording information on each layer of a recording surface having a multilayer structure, and an optimum recording power of a laser beam emission power at the time of recording information. In an optical disc recording / reproducing apparatus having means for recording and reproducing information on and from an optical disc in which a test writing area used for determining a value is provided at different positions, when recording information on the optical disc, Is provided with an optimum recording power value determining means for performing a test writing of the recording power in a test writing area on the same layer as the data area for recording the optimum recording power value.

Further, a data area for recording information on each layer of the recording surface of the multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. When information is recorded in a data area of any one of the layers of the optical disc, a test write of the same layer as the data area is performed. Of the multiple sub-regions within the region,
It is preferable to provide an optimum recording power value determining means for performing test writing on a new small area at a position corresponding to a small area where test writing has not been performed yet in a test writing area of another layer to obtain an optimum recording power value.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of the emission power of the laser beam at the time of recording information are respectively located at different positions. When information is recorded in a data area of any one of the layers of the optical disc, a test write of the same layer as the data area is performed. From a plurality of small areas in the area, a test write is performed on a new small area at a position corresponding to a small area in which a test write has not yet been performed in a test write area in a higher layer than the test write area, and an optimum recording power value is obtained. Is preferably provided.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are different from each other. In an optical disc recording / reproducing apparatus provided with means for recording and reproducing information on and from an optical disc provided at a position, when recording information in a data area of any layer of the optical disc,
A new small area at a position corresponding to a small area that has not yet been subjected to test writing in a test writing area in a layer higher than the test writing area among a plurality of small areas in the test writing area on the same layer as the data area. Detecting, when information has already been recorded in the recording location of the upper layer data area corresponding to the recording location of the information in the data area, the information corresponding to the detected small area in the same layer as the data area. After recording random information in a small area of the test writing area of the upper layer, it is preferable to provide an optimum recording power value determining means for performing test writing on the detected small area to obtain an optimum recording power value.

Further, a data area for recording information only on one layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a light emission power of a laser beam at the time of recording information. When recording information on the optical disc in an optical disc recording / reproducing apparatus provided with means for recording and reproducing information on an optical disc provided at different positions and provided only with a data area for recording information on other layers. Performing test writing of recording power on a test writing area of a layer having two areas, the data area and the test writing area, to obtain an optimum recording power value;
An optical disk recording / reproducing apparatus provided with an optimum recording power value determining means for obtaining an optimum recording power value of a layer having only the data area based on the optimum recording power value.

Further, there is provided an optical disk recording / reproducing apparatus provided with the following means (1) to (6).

(1) A data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are different from each other. When information is recorded on an optical disc provided at a position, first optimum recording power value determining means for performing test writing of recording power in a test writing area on the same layer as a data area for recording the information to obtain an optimum recording power value .

(2) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the emission power of the laser beam at the time of recording information are different from each other. When information is recorded in the data area of any layer of the optical disk provided at the position, the test writing of the test writing area of the other layer among the plurality of small areas in the test writing area of the same layer as the data area is not performed. A second optimum recording power value determining means for performing test writing on a new small area at a position corresponding to the small area which has not been written to obtain an optimum recording power value;

(3) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the emission power of the laser beam when recording information are different from each other. When information is recorded in the data area of any layer of the optical disk provided at the position, of a plurality of small areas in the test writing area of the same layer as the data area, the test writing of the upper layer than the test writing area is performed. Third optimum recording power value determining means for performing test writing on a new small area at a position corresponding to a small area on which test writing has not yet been performed to obtain an optimum recording power value;

(4) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the emission power of the laser beam when recording information are different from each other. When information is recorded in the data area of any layer of the optical disk provided at the position, of a plurality of small areas in the test writing area of the same layer as the data area, the test writing of the upper layer than the test writing area is performed. A new small area at a position corresponding to a small area in which test writing has not yet been performed in the area is detected, and information has already been recorded in a recording location in the upper layer data area corresponding to the information recording location in the data area. When random information is recorded in a small area of the test writing area in the upper layer corresponding to the detected small area in the same layer as the data area, a test is performed in the detected small area. Fourth optimum recording power value determining means for writing to obtain an optimum recording power value.

(5) A data area for recording information on only one layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. Are provided at different positions, and when information is recorded on an optical disc provided with only a data area for recording information on the other layers, a test write area of a layer having two areas of the data area and the test write area is provided. Fifth optimum recording power value determining means for determining the optimum recording power value by performing test writing of the recording power and obtaining the optimum recording power value of a layer having only the data area based on the optimum recording power value.

(6) Means for selecting and validating any one of the first to fifth optimum recording power values.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. Method for determining the optimum recording power value of an optical disc by performing test writing of the recording power in a test writing area in the same layer as the data area for recording the information when recording information on the optical disc provided in the optical disc I will provide a.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. When information is recorded in the data area of any layer of the optical disk provided in the test writing area, the test writing of the test writing area of the other layer is still performed among the plurality of small areas in the test writing area of the same layer as the data area. It is preferable to determine the optimum recording power value of the optical disk by performing test writing on a new small area at a position corresponding to the small area that is not present and obtaining the optimum recording power value.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. When information is recorded in the data area of any layer of the optical disk provided in the test writing area, of the plurality of small areas in the test writing area of the same layer as the data area, the test writing area of the higher layer than the test writing area It is preferable to use a method for determining the optimum recording power value of the optical disc in which the test writing is performed on a new small area at a position corresponding to the small area on which the test writing has not yet been performed to obtain the optimum recording power value.

Further, a data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. When information is recorded in the data area of any layer of the optical disk provided in the test writing area, of the plurality of small areas in the test writing area of the same layer as the data area, the test writing area of the higher layer than the test writing area A new small area at a position corresponding to a small area where test writing has not yet been performed has been detected, and information has already been recorded in the recording area of the upper layer data area corresponding to the recording area of the information in the data area. At this time, after random information is recorded in the small area of the test writing area in the upper layer corresponding to the detected small area in the same layer as the data area, the test is performed in the detected small area. Write better to the optimum recording power of the optical disk for obtaining the value optimum recording power value determination method performed.

Further, a data area for recording information only on one layer of the recording surface of the multilayer structure and a test writing area used for determining the optimum recording power value of the emission power of the laser beam at the time of recording information. When information is recorded on an optical disc provided at different positions and provided only with a data area for recording information on other layers, recording is performed on a test writing area of a layer having two areas, the data area and the test writing area. The present invention also provides a method for determining an optimum recording power value for an optical disc, in which an optimum recording power value is obtained by performing test writing of power, and based on the optimum recording power value, an optimum recording power value for a layer having only the data area is obtained.

[0033]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to an embodiment of the present invention.

This optical disk recording / reproducing apparatus has a CPU,
It has the following functional units realized by a microcomputer including a ROM, a RAM, and the like, and records information with an optimum recording power value on the optical disc 1 having a two-layer structure shown in FIGS. 2, 3, and 7. Then, a process of reproducing information recorded on the optical disc 1 is performed.

The optical disk recording / reproducing apparatus can rotate the optical disk 1 freely by fixing the optical disk 1 to the optical disk rotating mechanism 2. After irradiating the optical disk 1 with a laser beam from the laser beam light source unit 3 and obtaining control initial conditions depending on the optical disk 1,
The servo control unit 8 performs control, irradiates a laser beam again, reads a signal of the optical disc 1 from the optical head unit 4, and processes a signal processing unit 5, a reproduction processing unit 7, an operation control unit 9
In, the reproduction signal is processed.

On the other hand, for recording information, after determining the control initial condition, the discriminating circuit 12 records the optical disk recording / reproducing apparatus according to any one of claims 1 to 5 of the present invention, and claim 7 to claim 7. 11. A determination is made as to the method for determining an optimum recording power value of the optical disk according to any one of (11), and the optimum recording power of the laser beam at the time of recording is determined for a test writing area determined based on the determination result. In order to obtain it, test writing is performed by sequentially changing the recording power.

Then, the recording information on which the test writing has been performed is reproduced, and the optical disk recording / reproducing apparatus according to any one of claims 1 to 5 of the present invention and the optical disk recording / reproducing apparatus according to any one of claims 7 to 11 of the present invention. For determining the optimum recording power value related to the method for determining the optimum recording power value of the optical disc. In this way, information can be recorded at the obtained optimum recording power value.

That is, each unit of the optical disk recording / reproducing apparatus performs the functions of the following units (A) to (G), and performs the processing of the optimum recording power value determining method of (H) to (L). Execute.

(A) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the emission power of the laser beam at the time of recording information are different from each other. A means for recording and reproducing information on and from an optical disk provided at a position.

(B) When recording information on an optical disk, a first optimum recording power value for obtaining an optimum recording power value by performing test writing of recording power in a test writing area on the same layer as a data area for recording the information. Decision means.

(C) When information is recorded in the data area of any layer of the optical disc, of the plurality of small areas in the test writing area of the same layer as the data area, the test writing area of another layer is still being tested. A second optimum recording power value determining means for performing test writing on a new small area at a position corresponding to a small area where no writing has been performed to obtain an optimum recording power value.

(D) When information is recorded in the data area of any layer of the optical disk, of the plurality of small areas in the test writing area of the same layer as the data area, the information is recorded in the upper layer of the test writing area. Third optimum recording power value determining means for performing test writing on a new small area at a position corresponding to a small area in which no test writing has been performed in the test writing area to obtain an optimum recording power value.

(E) When information is recorded in the data area of any layer of the optical disk, out of a plurality of small areas in the test writing area of the same layer as the data area, the information is recorded in the upper layer of the test writing area. A new small area is detected at a position corresponding to a small area in the test writing area that has not yet been subjected to the test writing, and information is already recorded in the recording area of the upper layer data area corresponding to the information recording area of the data area. When random information is recorded in the small area of the test writing area in the upper layer corresponding to the detected small area in the same layer as the data area, test writing is performed in the detected small area. A fourth optimum recording power value determining means for determining an optimum recording power value by performing the operation;

(F) A data area for recording information on only one layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. Are provided at different positions, and when information is recorded on an optical disc having only a data area for recording information on the other layers, the test writing of the layer having the two areas of the data area and the test writing area is performed. Fifth optimum recording power value determining means for performing test writing of recording power on an area to determine an optimum recording power value, and calculating an optimum recording power value for a layer having only the data area based on the optimum recording power value.

(G) Means for selecting and validating any one of the first to fifth optimum recording power values.

(H) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the laser beam emission power at the time of recording information are different from each other. When recording information on an optical disc provided at a position, a test writing of recording power is performed in a test writing area on the same layer as a data area for recording the information to determine an optimum recording power value for the optical disc. processing.

(I) A data area for recording information on each layer of the recording surface of the multilayer structure is different from a test writing area used for determining an optimum recording power value of the emission power of the laser beam when recording information. When information is recorded in the data area of any layer of the optical disk provided at the position, the test writing of the test writing area of the other layer among the plurality of small areas in the test writing area of the same layer as the data area is not performed. Optimal recording power value determination processing for an optical disc in which trial writing is performed on a new small area at a position corresponding to a small area that has not been written to determine an optimum recording power value.

(J) A data area for recording information on each layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of information recording are different from each other. When information is recorded in the data area of any layer of the optical disk provided at the position, of the plurality of small areas in the test writing area of the same layer as the data area, the test writing of the higher layer than the test writing area is performed. Optimal recording power value determination processing of an optical disc for performing trial writing on a new small area at a position corresponding to a small area on which trial writing has not yet been performed to obtain an optimum recording power value.

(K) The data area for recording information on each layer of the recording surface of the multilayer structure and the test writing area used for determining the optimum recording power value of the emission power of the laser beam at the time of recording information are different from each other. When information is recorded in the data area of any layer of the optical disk provided at the position, of a plurality of small areas in the test writing area of the same layer as the data area, the test writing of the upper layer than the test writing area is performed. A new small area at a position corresponding to a small area in which test writing has not yet been performed in the area is detected, and information has already been recorded in a recording location in the upper layer data area corresponding to the information recording location in the data area. When random information is recorded in a small area of the test writing area in the upper layer corresponding to the detected small area in the same layer as the data area, a test is performed in the detected small area. Optimal recording power value determination processing for an optical disc for writing to determine the optimal recording power value.

(L) A data area for recording information on only one layer of the recording surface of the multilayer structure, and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. Are provided at different positions, and when information is recorded on an optical disc provided with only a data area for recording information on the other layers, a test write area of a layer having two areas of the data area and the test write area is provided. Optimal recording power value determination processing for an optical disc in which trial writing of recording power is performed to determine an optimum recording power value, and based on the optimum recording power value, an optimum recording power value of a layer having only the data area is determined.

Next, an optical disc 1 having a two-layered recording surface used in this optical disc recording / reproducing apparatus will be described. FIG. 2 is a sectional view of an example of the optical disc 1 having a two-layer recording surface. FIG. 3 is an explanatory diagram showing an example of a configuration of a data area and a test writing area of the optical disc 1 having a two-layer recording surface.

As shown in FIG. 2, the optical disk 1 has a recording surface for recording information divided into a first layer 20 and a second layer 21. The distance between the recording layers of the first layer 20 and the second layer 21 is 40 to 60 μm, and the distance from the surface of the optical disc 1 to the midpoint between the first layer 20 and the second layer 21 is , 0.57 mm. In addition, the first layer 20
Is a translucent recording layer, and the reflectance is suppressed to 18 to 30%.

As shown in FIG. 3, on the recording surfaces of both layers 20 and 21 of the optical disc 1 having a two-layer structure, data areas D1 (first layer 20) and D2 (second layer 20) for recording information are recorded. The test writing areas T1 (first layer 20) and T2 (second layer 21) used for determining the emission power of the laser beam when recording information are provided at different positions.

Next, a description will be given of a process for obtaining the optimum value of the recording laser power when recording information on the optical disk 1 having the two-layer structure shown in FIGS. 2 and 3 in this optical disk recording / reproducing apparatus.

FIG. 4 is a flow chart showing processing relating to the method for determining the optimum recording laser power value according to claim 7 by the function of the means according to claim 1 of the present invention in this optical disk recording / reproducing apparatus.

The optical disk recording / reproducing apparatus uses the optical disk 1
When the data area to be recorded is detected in step (indicated by "S" in the figure) 1 at the time of recording information to the memory, the process proceeds to step 2 to detect a test writing area on the same layer as the data area to be recorded. Proceeding to 3, the test writing is performed by changing the recording light emission power (recording power value) stepwise.

Proceed to step 4 to read and compare the recording result of the test writing, proceed to step 5 to determine the optimum recording power value, and proceed to step 6 to obtain the preset optimal recording power value. Then, information is recorded in the data area with the corrected optimum recording power value, and the recording process ends.

Further, the optimum recording power value determination processing in this recording processing will be described. This optical disk recording / reproducing apparatus is a test area used for determining an optimum recording power value of a laser beam emission power at the time of recording information and data areas (D1, D2) for recording information on each layer of a recording surface of a multilayer structure. When information is recorded on the optical disc 1 in which the writing areas (T1, T2) are provided at different positions,
The test writing of the recording power is performed in the test writing area (T2) of the same layer as the data area (for example, D2) in which the information is recorded, and the optimum recording power value is obtained.

For example, as shown in FIG. 3, when information is recorded in the data area D2a in the second layer 21, the test writing area T2 in the same second layer 21 as the data area D2a is recorded.
At a, test writing recording is performed by sequentially changing the laser beam stepwise.

After that, when the recording in the test writing area T2a is completed, the written information is read out and detected, the comparison is performed, and the optimum recording power value in the data area D2a is calculated and stored.

Then, by correcting the laser power having the preset optimum recording power value to the calculated optimum recording power value, information can be correctly recorded in the data area D2a.

As described above, this optical disk recording / reproducing apparatus has a multi-layer structure, and has a test writing area and a data area in each layer. It is possible to determine the optimum recording power value by performing test write recording on the area. Therefore, a recording mark can be correctly formed on the recording layer for recording information, and the recorded information can be reproduced without error.

Next, a description will be given of a processing example relating to the method for determining the optimum recording laser power value according to claim 8 by the function of the means according to claim 2 of the present invention.

In this recording processing, in the recording processing shown in FIG. 4, when the test writing is performed to obtain the optimum recording power value, the test writing is performed using a new test writing area in which no test writing is performed in any layer. To determine the optimum recording power value.

The optimum recording power value determination processing in this recording processing will be described. This optical disk recording / reproducing apparatus is a test area used for determining an optimum recording power value of a laser beam emission power at the time of recording information and data areas (D1, D2) for recording information on each layer of a recording surface of a multilayer structure. A data area (for example, in any layer) of the optical disc 1 in which the writing areas (T1, T2) are provided at different positions, respectively.
When information is recorded in D2), its data area (D2)
And a plurality of small areas (T2) in the test writing area (T2)
a, T2b), test writing is performed on a new small area (T2b) at a position corresponding to a small area (for example, T1b) of the test writing area (T1) of another layer which has not been subjected to the test writing yet, and optimal recording is performed. Find the power value.

For example, as shown in FIG.
When recording information in the data recording small area D2a, the test writing area T2 on the same layer as the data recording small area D2a
The case where test writing is performed on the small area T2a will be described.

Here, the small area T2a of the test writing area T2
Alternatively, the small area T1 of the test writing area T1 of the first layer 21
If the test writing has already been performed in a, the small area T2a of the test writing area T2 is not used.

On the other hand, if the small area T1b of the test writing area T1 of the first layer 20 or the small area T2b of the test writing area T2 of the second layer 21 is not used, the test writing area T2 is tested. The writing target is changed from the small area T2a to the small area T2.
The test writing is performed by gradually changing the recording power in the small area T2b of the test writing area, and performing the test writing, and obtaining the optimum recording power value based on the result of the test writing.

As described above, this optical disk recording / reproducing apparatus performs test write recording by gradually changing the laser beam in the test write area of an optical disk having a multilayer structure in order to determine the optimum recording power value. Since the optimum recording power value is always calculated using a new test writing area in which no test writing has been performed in the test writing area of any layer,
The optimum recording power value suitable for the condition of the layer can be corrected without being affected by another layer.

Next, a description will be given of a process relating to the method for determining an optimum recording laser power value according to the ninth aspect of the present invention, which is performed by the function of the means according to the third aspect of the present invention.

FIG. 5 is a flowchart showing the processing. When recording information on the optical disk 1, the optical disk recording / reproducing apparatus detects a data area to be recorded in step (indicated by "S" in the figure) 11 and proceeds to step 12 to select a data area for recording. The test writing area in the same layer is detected, and the process proceeds to step 13 to determine whether or not the test writing is performed in a higher layer (for example, the first layer 20) than the layer in which the test writing is performed.

If the test writing has been performed in the above determination, the flow advances to step 14 to move to the next new test writing area, and the flow advances to step 16 to change the recording light emission power (recording power value) stepwise to perform the test writing. Perform

If test writing has not been performed in the above determination, the process proceeds to step 15 without shifting to the test writing area, and proceeds to step 16 to change the recording light emission power (recording power value) stepwise to perform the test writing. Perform

Proceeding to step 17, the recording result of the test writing is read and compared, and proceeding to step 18, the optimum recording power value is obtained. Then, the process proceeds to step 19, where the preset optimum recording power value is obtained. Then, information is recorded in the data area with the corrected optimum recording power value, and the recording process ends.

Further, the optimum recording power value determination processing in this recording processing will be described. This optical disk recording / reproducing apparatus is a test area used for determining an optimum recording power value of a laser beam emission power at the time of recording information and data areas (D1, D2) for recording information on each layer of a recording surface of a multilayer structure. When information is recorded in a data area (for example, D2) of any layer of the optical disc 1 in which the writing areas (T1, T2) are provided at different positions, a test writing area on the same layer as the data area (D2). Of the plurality of small areas (T2a, T2b) in (T2), the test writing area (T2
Test writing is performed on a new small area (T2b) at a position corresponding to a small area (for example, T1b) in which the test writing has not been performed yet in the test writing area (T1) of a higher layer than 2), and the optimum recording power value is set. Ask.

For example, as shown in FIG. 3, when information is recorded in the small area D2a of the data area D2 of the second layer 21, the same information is recorded in the second layer 21 as the small area D2a of the data area D2.
, A small area T2a of the test writing area T2 is detected.

After the small area T2a is detected, the small area T1a of the test writing area T1 of the first layer 20, which is the upper layer of the small area T2a of the test writing area T2, is detected.
It is determined whether 1a has already been trial written.

If the small area T1a of the test writing area T1 has already been subjected to the test writing, the test writing area for actually performing the test writing is shifted from the small area T2a to the small area T2b.

Then, the small area T2b of the test writing area T2
However, similarly, it is determined whether or not test writing has been previously performed on the small area T1b of the test writing area T1 of the upper layer (first layer 20). Test writing is performed by sequentially changing the laser beam stepwise in the small area T2b of the writing area T2.

Thereafter, the small area T2b of the test writing area T2
When the recording on the data area D is completed, the written information is read and detected, the comparison is performed, and the optimum recording power value in the small area D2a of the data area D2 is calculated and stored.

Then, by correcting the laser power of the preset optimum recording power value to the calculated optimum recording power value, information can be correctly recorded in the data area D2a.

On the other hand, information is stored in the data area D of the first layer 20.
When recording in the first small area D1a, the test writing area T1 on the same first layer 20 as the small area D1a in the data area D1.
Is detected.

Here, the small area T1a of the test writing area T1
Therefore, even if the test writing was previously performed on the small area T2a of the test writing area T2 of the second layer 21, the test writing must be performed on the small area T1a of the test writing area T1. For example, the test write recording is performed by sequentially changing the laser beam stepwise in the small area T1a of the test write area T1, and the optimum recording power value is obtained. Therefore, the space for the test writing area can be saved, and a large number of data areas can be provided.

As described above, this optical disk recording / reproducing apparatus performs test writing in a test writing area of the same layer as a data area for recording information on an optical disk having a multilayer structure. If the test writing has already been performed in a lower layer than the layer, the test writing is performed in the same test writing area, but if the test writing has already been performed in the upper layer, the test writing area is not used. Test writing is performed in a new next test writing area. Therefore, the test writing area can be used efficiently, and the data area can be widened.

Next, a description will be given of a process relating to the optimum recording power value determining method according to the tenth aspect of the present invention, which is performed by the function of the means according to the fourth aspect of the present invention.

FIG. 6 is a flowchart showing the processing. When recording information on the optical disk 1, the optical disk recording / reproducing apparatus detects a data area to be recorded in step (indicated by "S" in the figure) 21 and proceeds to step 22 to execute an upper layer (for example, , The first layer) is detected as to whether or not information is recorded in the data area.

Proceeding to step 23, upper layer (first layer)
If the information is recorded in the data area of the hierarchical level, random data (random information based on a preset rule) is recorded in the test writing area of the hierarchical level.
Then, the process proceeds to the test writing area on the same layer as the data area for recording information.

Further, the process proceeds to step 24, where the upper layer (first
If no data (information) is recorded in the layer of
In step 25, the test writing area is left as it is without shifting.
Then, the process proceeds to the test writing area on the same layer as the data area for recording information.

Thereafter, the process proceeds to step 26, in which test writing is performed by changing the recording light emission power (recording power value) stepwise. The process proceeds to step 27, where the recording result of the test writing is read and compared, and the process proceeds to step 28. In step 29, the optimum recording power value is calculated, and the preset optimum recording power value is corrected to the above-mentioned optimum recording power value. Is recorded, and this recording process ends.

Further, the optimum recording power value determination processing in this recording processing will be described. This optical disk recording / reproducing apparatus is a test area used for determining an optimum recording power value of a laser beam emission power at the time of recording information and data areas (D1, D2) for recording information on each layer of a recording surface of a multilayer structure. When information is recorded in a data area (for example, D2) of any layer of the optical disc 1 in which the writing areas (T1, T2) are provided at different positions, a test writing area on the same layer as the data area (D2). Of the plurality of small areas (T2a, T2b) in (T2), the test writing area (T2
A new small area (T2a) at a position corresponding to a small area (for example, T1a) in which test writing has not yet been performed in the test writing area (T1) of a higher layer than 2) is detected, and the data area (D2) The recording location (D1) in the data area (D1) of the upper layer corresponding to the recording location (for example, D2a) of the information
If information has already been recorded in a), a small area (T1) in the test writing area (T1) in the upper layer corresponding to the detected small area (T2a) in the same layer as the data area (D2).
After recording random information in 1a), test writing is performed on the detected small area (T2a) to obtain an optimum recording power value.

For example, as shown in FIG. 3, when information is recorded in the small area D2a of the data area D2 of the second layer 21, the information is recorded in the upper layer (first layer 20) of the small area D2a of the data area D2. Detecting a small area D1a of a certain data area D1,
It is determined whether information is already recorded in the small area D1a.

If the information is not recorded in the small area D1a of the data area D1, the small area T2a of the test writing area T2 on the same layer as the small area D2a of the data area D2 for recording the information.
To obtain an optimum recording power value.

However, if information has already been recorded in the small area D1a of the data area D1, test writing should have been originally performed on the small area D2a of the data area D2. Random data is recorded in the small area T1a of the test writing area T1 in the upper layer (first layer 20) of the small area T2a before the test writing.

This corresponds to the small area T1a of the test writing area T1.
By recording random data in the small area D1 of the data area D1 with respect to the small area D2a of the data area D2.
This is because the same condition as 1a is created for the small area T2a of the test writing area T2 and the small area T1a of the test writing area T1.

Then, the small area T1a of the test writing area T1
With random data recorded in the test writing area T
The test write recording is performed by sequentially changing the laser beam in a stepwise manner in the second small area T2a to determine the optimum recording power value.

As described above, this optical disk recording / reproducing apparatus is suitable for an optical disk having a multi-layer structure, if data has already been recorded in a data area of a higher hierarchy than a data area in which information is recorded. Also in the test writing area for calculating the recording power value, once recording is performed in the same test writing area as the layer in which data is already recorded, and then test writing is performed in the test writing area of the layer for which the optimum recording power value is calculated. To determine the optimum recording power value.

Therefore, the optimum recording power value can be obtained by taking into account not only the optimum recording power value for the layer for recording information but also the situation of other layers which are considered to be involved in that layer.

Next, another example of the optical disk 1 having a two-layered recording surface used in the optical disk recording / reproducing apparatus will be described. FIG. 7 is an explanatory diagram showing another example of the configuration of the data area and the test writing area of the optical disc 1 having a two-layered recording surface.

This optical disk 1 has a two-layer structure as in the optical disk shown in FIG. 2, but as shown in FIG. 7, one of the recording surfaces having the two-layer structure (the first layer
A data area D1 for recording information only in the area 0) and a test writing area T1 used to determine the emission power of the laser beam when recording information are provided at different positions.
Then, on the other recording surface (second layer 21), only the data area D2 for recording information exists.

Next, a description will be given of a process for obtaining the optimum value of the recording laser power when recording information on the optical disk 1 having the two-layer structure shown in FIG.

FIG. 8 is a flowchart showing a process relating to the method for determining an optimum recording laser power value according to claim 11 by the function of the means according to claim 5 of the present invention.

The optical disk recording / reproducing apparatus uses the optical disk 1
When information is recorded in the step (shown by "S" in the figure) 31
When the data area to be recorded is detected in step 3, the process proceeds to step 32, where the test writing area in the first layer is detected.
Proceeding to 3, the test writing is performed by changing the recording light emission power (recording power value) stepwise.

Proceeding to step 34, the recording result of the trial writing is read and compared, proceeding to step 35 to determine the optimum recording power value, and proceeding to step 36, where the second recording power value is calculated based on the calculated optimum recording power value. If the optimum recording power value of the layer is to be obtained, it is set to use the previously calculated coefficients of the second layer and the first layer. And
Proceeding to step 37, the optimum recording power value is calculated using the above-mentioned coefficient, and this processing ends.

Further, the processing for determining the optimum recording power value will be described. This optical disc recording / reproducing apparatus is used for determining a data area (D1) for recording information only on one layer of a recording surface of a multilayer structure and an optimum recording power value of a laser beam emission power at the time of recording information. When recording information on the optical disc 1 provided with the test writing area (T1) at different positions and only the data area (D2) for recording information on the other layers, the data area (D1) and the test writing area Test writing of recording power is performed on a test writing area (for example, T1a) of a layer having two areas (T1) to obtain an optimum recording power value, and based on the optimum recording power value, only a data area (D2) is provided. Find the optimum recording power value for the layer that does not exist.

For example, as shown in FIG. 7, when information is recorded in the small area D2a of the data area D2 of the second layer 21, the test writing area is only in the first layer 20.
The test writing recording is performed by sequentially changing the laser beam stepwise in the small area T1a of the test writing area T1 of the layer 20.

After the test writing is completed, the information written in the small area T1a of the test writing area T1 is read to determine the optimum recording power value. Further, in consideration of the difference between the optimum recording power values of the first layer 20 and the second layer 21 which have been obtained in advance, the optimum recording power value of the first layer 20 is calculated using a coefficient. The optimum recording power value of the second layer 21 is calculated from the recording power value.

The information is correctly recorded in the small area D2a of the data area D2 by correcting the preset optimum recording power value to the laser power of the optimum recording power value obtained by the above calculation and recording. You can do it.

As described above, this optical disk recording / reproducing apparatus has a multilayer structure having only one data layer and two areas, ie, a data area and a test writing area, and other recording layers having only a data area. When recording on an optical disk, the optimum recording power of a recording layer having only a data area and a test writing area is determined by test writing,
From this, the optimum recording power of the recording surface on which information is actually recorded is calculated, so that it is not necessary to have a test writing area in each layer of the optical disc, and a large amount of data area can be used.

In the above-mentioned optical disk recording / reproducing apparatus, the optimum recording power value determining means according to the first to fifth aspects of the present invention is provided alone or in combination for an optical disk having a multilayer structure. By selecting and validating, it is possible to easily record and reproduce information without worrying about the type of the optical disk medium.

[0110]

As described above, according to the optical disc recording / reproducing apparatus and the optimum recording power value determining method of the optical disc of the present invention, when information is recorded on an optical disc having a multi-layered structure which can be additionally written or rewritten, The laser output at the time of recording with respect to the data area of the layer to which information is written can be adjusted to an optimum recording power value.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an example of an optical disc 1 having a two-layered recording surface used by the optical disc recording / reproducing apparatus shown in FIG.

3 is an explanatory diagram showing an example of a configuration of a data area and a test writing area of an optical disc 1 having a two-layered recording surface used by the optical disc recording / reproducing apparatus shown in FIG.

FIG. 4 is a block diagram of the optical disk recording / reproducing apparatus shown in FIG. 1 according to the function of the means described in claim 1 of the present invention;
5 is a flowchart showing a process related to an optimum recording laser power value determining method described in FIG.

FIG. 5 is a block diagram showing an optical disk recording / reproducing apparatus shown in FIG. 1 according to a third embodiment of the present invention;
5 is a flowchart showing a process related to an optimum recording laser power value determining method described in FIG.

FIG. 6 is a block diagram showing an optical disk recording / reproducing apparatus shown in FIG. 1 according to a fourth embodiment of the present invention;
7 is a flowchart illustrating a process related to an optimum recording power value determination method described in No. 0.

FIG. 7 is an explanatory diagram showing another example of the configuration of the data area and the test writing area of the optical disc 1 having a two-layered recording surface used by the optical disc recording / reproducing apparatus shown in FIG.

FIG. 8 is a block diagram of the optical disk recording and reproducing apparatus shown in FIG. 1 according to the function of the means described in claim 5 of the present invention;
3 is a flowchart illustrating a process related to the optimum recording laser power value determination method described in No. 1.

[Explanation of symbols]

 1: optical disk 2: optical disk rotation mechanism 3: laser beam light source 4: optical head 5: signal processing unit 6: test writing / reproduction signal processing unit 7: reproduction processing unit 8: servo control unit 9: operation control unit 10: Laser beam control unit 11: trial writing recording control unit 12: discrimination circuit 20: first layer 21: second layer

Claims (11)

[Claims] 1. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. An optical disk recording / reproducing apparatus having means for recording and reproducing information on and from an optical disk provided in the optical disk, wherein when recording information on the optical disk, recording power is applied to a test writing area on the same layer as a data area for recording the information. An optical disk recording / reproducing apparatus provided with an optimum recording power value determining means for obtaining an optimum recording power value by performing test writing. 2. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a light emission power of a laser beam at the time of recording information, respectively. An optical disc recording / reproducing apparatus provided with means for recording and reproducing information on and from an optical disc provided in the optical disc, wherein when information is recorded in a data area of any layer of the optical disc, Optimum recording to obtain the optimum recording power value by performing test writing on a new small area at a position corresponding to the small area where the test writing has not been performed yet in the test writing area of the other layer among the multiple small areas in the test writing area An optical disk recording / reproducing apparatus comprising a power value determining means. 3. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. An optical disk recording / reproducing apparatus provided with means for recording and reproducing information on and from an optical disk provided in the optical disk, when recording information in a data area of any layer of the optical disk, Of a plurality of small areas in the test writing area of the layer, performing test writing in a new small area at a position corresponding to a small area in which the test writing has not been performed yet in the test writing area of the upper layer than the test writing area. An optical disc recording / reproducing apparatus comprising an optimum recording power value determining means for obtaining an optimum recording power value. 4. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. An optical disk recording / reproducing apparatus provided with means for recording and reproducing information on and from an optical disk provided in the optical disk, when recording information in a data area of any layer of the optical disk, A new small area at a position corresponding to a small area in which the test writing has not yet been performed in the test writing area in the upper layer than the test writing area is detected from among the plurality of small areas in the test writing area of the layer, When information has already been recorded at a recording location in the data area of the upper layer corresponding to the recording location of the information in the data area, the information corresponds to the detected small area in the same layer as the data area. Said After recording random information in a small area of the test writing area of the lower layer, an optimum recording power value determining means for performing a test writing on the detected small area to obtain an optimum recording power value is provided. Optical disk recording and playback device. 5. A data area for recording information only on one layer of a recording surface having a multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. An optical disc recording / reproducing apparatus provided with means for recording and reproducing information on an optical disc provided at different positions and having only a data area for recording information on other layers; The test write area of the layer having the two areas of the data area and the test write area is subjected to the test write of the recording power to obtain the optimum write power value, and based on the optimum write power value, only the data area is provided. An optical disc recording / reproducing apparatus comprising an optimum recording power value determining means for obtaining an optimum recording power value of a layer. 6. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. When information is recorded on the optical disk provided in the first area, first optimum recording power value determining means for performing test writing of recording power in a test writing area on the same layer as a data area for recording the information to obtain an optimum recording power value; An optical disc having a data area for recording information on each layer of a recording surface having a multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information at different positions; When information is recorded in the data area of any one of the layers, of the plurality of small areas in the test writing area on the same layer as the data area, A second optimum recording power value determining means for performing test writing on a new small area at a position corresponding to a small area on which test writing has not been performed to obtain an optimum recording power value; A data area for recording and a test writing area used for determining the optimum recording power value of the emission power of the laser beam at the time of recording information are provided at different positions in the data area of any layer of the optical disc. When information is recorded, of the plurality of small areas in the test writing area on the same layer as the data area, a small area in which the test writing has not yet been performed in the test writing area on the upper layer than the test writing area. Third optimum recording power value determining means for performing test writing on a new small area at a corresponding position to obtain an optimum recording power value; a data area and information for recording information on each layer of a recording surface of a multilayer structure When information is recorded in a data area of any layer of an optical disc provided with a test writing area used to determine an optimum recording power value of a laser beam emission power at the time of recording, the data is stored in the data area. Of a plurality of small areas in the test writing area on the same layer as the data writing area, a new small area at a position corresponding to a small area in which the test writing has not been performed yet in the test writing area in the upper layer than the test writing area is detected. And
When information has already been recorded in the recording location of the data area in the upper layer corresponding to the recording location of the information in the data area, the information is stored in the detected small area in the same layer as the data area. Fourth optimum recording power value determining means for recording random information in a corresponding small area of the upper layer test writing area and then performing test writing on the detected small area to obtain an optimum recording power value; A data area for recording information only on one layer of the recording surface of the multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are provided at different positions. When information is recorded on an optical disc having only a data area for recording information in the other layers, the recording power test is performed in a test writing area of a layer having two areas, the data area and the test writing area. Fifth optimum recording power value determining means for obtaining an optimum recording power value by performing writing and obtaining an optimum recording power value of a layer having only the data area based on the optimum recording power value; Means for selecting and activating any one of the optimum recording power values. 7. A data area for recording information in each layer of a recording surface of a multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information are respectively located at different positions. Recording information on the optical disk provided in the optical disk, and performing test writing of the recording power in a test writing area on the same layer as the data area for recording the information to obtain an optimum recording power value. Recording power value determination method. 8. A data area for recording information on each layer of a recording surface of a multilayer structure and a test writing area used for determining an optimum recording power value of a light emission power of a laser beam at the time of recording information. When information is recorded in the data area of any layer of the optical disk provided in the above, the test writing area of the test writing area of the other layer is not yet written among the plurality of small areas in the test writing area of the same layer as the data area. A method for determining an optimum recording power value for an optical disk, wherein test writing is performed on a new small area at a position corresponding to a small area where no writing has been performed to determine an optimum recording power value. 9. A data area for recording information on each layer of a recording surface of a multilayer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information, respectively. When information is recorded in the data area of any layer of the optical disk provided in the above-mentioned area, of the plurality of small areas in the test writing area of the same layer as the data area, a layer higher than the test writing area A method for determining the optimum recording power value of an optical disk by performing test writing on a new small area at a position corresponding to a small area where test writing has not been performed yet in the test writing area. 10. A data area for recording information on each layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information, respectively. When information is recorded in the data area of any layer of the optical disk provided in
Of a plurality of small areas in the test writing area on the same layer as the data area, a new small area at a position corresponding to a small area in which the test writing has not been performed yet in the test writing area on the upper layer than the test writing area. When an area has been detected and information has already been recorded in a recording location of a data area in an upper layer corresponding to the recording location of the information in the data area, the detection in the same layer as the data area is performed. An optical disk for recording random information in a small area of the upper layer test writing area corresponding to the detected small area, and then performing test writing in the detected small area to obtain an optimum recording power value. Method for determining the optimum recording power value. 11. A data area for recording information only on one layer of a recording surface of a multi-layer structure and a test writing area used for determining an optimum recording power value of a laser beam emission power at the time of recording information. Set up in different positions,
When information is recorded on an optical disk having only a data area for recording information on other layers, test writing of recording power is performed on a test writing area of a layer having two areas, the data area and the test writing area. An optimal recording power value for a layer having only the data area based on the optimal recording power value.