JP2007207286A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of achieving a long life of holding performance of data recorded in an optical disk even by using a normal optical disk. <P>SOLUTION: The optical disk device 10 for recording data in an optical disk 20 by a laser beam emitted from an optical pickup 30, includes a control means 40 or controlling the optical pickup 30 to record data by shifting deviation from optimal deviation during data recording so that optimal deviation is set when deviation changes with deterioration of the optical disk 20 with time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus, and more specifically, by recording data on an optical disc by recording at least one of a deviation of a reflected light signal immediately after data recording on the optical disc and a beta value from an optimum state. The present invention relates to an optical disc apparatus capable of maintaining the recording quality of the data recorded in (1) over a long period of time.

In order to maintain the recording quality of the data recorded on the optical disc for a long period of time, for example, a method of adopting a durable material as the material constituting the protective film of the optical disc is used. As such a technique, for example, a technique disclosed in Patent Document 1 has been proposed. The technique according to Patent Document 1 is intended to prevent corrosion of the protective film by adding sulfur or phosphorus to the material of the protective film of the optical disk, and to maintain the recording quality of data recorded on the optical disk for a long period of time.
JP 7-37284 A

  As in the optical disk described in Patent Document 1, in order to contain sulfur and phosphorus in the protective film, there is a problem that the manufacturing cost of the optical disk is increased because it takes time and effort in terms of materials and processes. Further, since sulfur and phosphorus are harmful substances, there is a problem that handling of these materials is troublesome at the time of manufacturing an optical disc.

  The present invention has been made to solve the above-mentioned problems, and its object is to maintain the recording quality of data recorded on an optical disc for a long period of time while using an optical disc formed of a normal material. It is an object of the present invention to provide an optical disc apparatus capable of performing the above.

An optical disc apparatus according to the present invention has the following configuration.
That is, in an optical disk apparatus that records data on an optical disk with laser light emitted from an optical pickup, in order to maintain an error-correctable level of a reflected light signal when reading the data recorded on the optical disk, Control means for controlling the optical pickup so as to record the data on the optical disc by removing the deviation at the time of data recording from the optimum deviation so that the optimum deviation is obtained when the deviation changes due to deterioration. This is an optical disc device.
As a result, the deterioration of the data recording quality does not start immediately after the recording, and the deterioration of the recording quality of the data recorded on the optical disk is postponed.

  Further, in an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, in order to maintain an error-correctable level of a reflected light signal when reading the data recorded on the optical disc, Control means for controlling the optical pickup so as to record the data on the optical disc by removing the beta value at the time of data recording from the optimum beta value so that the optimum beta value is obtained when the beta value changes with deterioration. An optical disc apparatus comprising the optical disc device.

  Further, in an optical disk apparatus that records data on an optical disk by laser light emitted from an optical pickup, in order to maintain an error-correctable level of a reflected light signal when reading the data recorded on the optical disk, When the deviation and the beta value change due to deterioration, the deviation and the beta value at the time of data recording are removed from the optimum deviation and the optimum beta value so that at least one of the deviation and the beta value becomes an optimum state. An optical disc apparatus comprising control means for controlling the optical pickup so as to record data.

  Also, in an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, it is optimal for the purpose of maintaining the error-correctable level of the reflected light signal when reading the data recorded on the optical disc for a long period of time. Using the optimum deviation immediately after the data is recorded according to the conditions and the degradation deviation after the deterioration of the optical disc on which the data is recorded according to the optimum conditions, the state is changed from the optimum deviation to the degraded deviation. As a correction strategy, a strategy for obtaining a correction deviation obtained by changing the optimum deviation is used as a correction strategy, and storage means stored in advance corresponding to the type of the optical disk is provided. Then, after specifying the type of the mounted optical disk, a correction strategy corresponding to the specified optical disk type is extracted from the storage means, and the optical pickup is used to extract the correction strategy corresponding to the specified optical disk type. An optical disc apparatus that records data on a loaded optical disc.

  Furthermore, in an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, for the purpose of maintaining a level capable of error correction of a reflected light signal when reading data recorded on the optical disc for a long period of time, Using the optimum beta value immediately after the data is recorded under the optimum condition and the degradation beta value after the degradation of the optical disk on which the data is recorded according to the optimum condition, the state changed from the optimum beta value to the degraded beta value; Compensation beta value obtained by changing the optimum beta value to the opposite change state is provided with storage means that is stored in advance corresponding to the type of optical disc, and the control means is provided after the optical disc is mounted. Identifies the type of the mounted optical disc, and specifies the specified optical disc. After extracting the corrected beta value corresponding to the type of light from the storage means, the corrected beta light output is determined by the OPC operation using the corrected beta value as a target value, and the optical pickup is mounted by using the corrected laser light output. An optical disc apparatus that records data on an optical disc.

  Furthermore, in an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, for the purpose of maintaining a level capable of correcting an error of a reflected light signal when reading data recorded on the optical disc for a long period of time. From the optimum deviation to the degraded deviation, the optimum deviation and the optimum beta value immediately after the data is recorded under the optimum condition and the degradation deviation and the degraded beta value after the deterioration of the optical disc on which the data is recorded according to the optimum condition are used. A strategy for obtaining a correction deviation obtained by changing the optimum deviation to a change state opposite to the changed state is a correction strategy, and a state in which the optimum beta value is changed to the deteriorated beta value A beta value obtained by changing the optimum beta value to the change state of the above is used as a corrected beta value, and the storage unit stores the correction strategy and the corrected beta value in advance corresponding to the type of the optical disc, After the optical disk is mounted, the control unit identifies the type of the mounted optical disk, extracts a correction strategy and a correction beta value corresponding to the specified type of the optical disk from the storage unit, and then performs the correction. An optical disc characterized in that an OPC operation is executed with a beta value as a target value, a corrected laser beam output is determined, and data is recorded on the mounted optical disc by the optical pickup using the correction strategy and the corrected laser beam output. Device.

The storage means also stores in advance an optimum strategy and optimum beta value for recording data on the optical disc in an optimum state in a state corresponding to the type of the optical disc, and the control means stores the data on the optical disc. At least one of a strategy and a beta value to be used for recording is selected by the user from the optimum strategy, the correction strategy, the optimum beta value, and the corrected beta value stored in the storage unit. It has the input means which can do.
This allows the user to select either a normal data writing method or a long-life data writing method when writing data to the optical disc, depending on the purpose of the data to be recorded, etc. It will be possible to properly use them accordingly.

According to the optical disk device of the present invention, the recording quality of the data recorded on the optical disk can be maintained for a long time even for an optical disk formed of a normal material.
In addition, the user can select either the conventional data recording method that optimizes the data recording quality immediately after writing the data on the optical disc, or the data recording method that can maintain the data recorded on the optical disc for a long period of time. Thus, the method of writing data to the optical disc can be used properly according to the purpose.

(First embodiment)
The best mode of the optical disk apparatus according to the present embodiment will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the optical disc apparatus according to the first embodiment. FIG. 2 is an explanatory diagram showing the correlation between the optimum deviation, the degradation deviation, and the correction deviation. FIG. 3 is an explanatory diagram showing the correlation among the optimum beta value, the deteriorated beta value, and the corrected beta value.
The deviation is one of the physical basic elements of the reproduction signal of the optical disc 20, and is a deviation of the distribution with respect to the theoretical values of the pit and land positions. The beta value is an index indicating the balance of physical recording of pits and lands. That is, the deviation and the change in the beta value directly affect the state of the reflected signal (that is, the quality of the data recorded on the optical disc 20).

The optical disc apparatus 10 in the present embodiment includes an optical pickup 30 that irradiates a laser beam onto the optical disc 20, an RF amplifier 40 that binarizes an RF signal from the optical pickup 30, a control unit 50, a storage unit 60, This has a general configuration including an encoder 70 for converting data to be recorded on the optical disc 20.
The optical pickup 30 includes a laser diode 32 that irradiates the optical disc 20 with laser light, and a photodiode 34 that receives reflected light from the optical disc 20.
The control means 50 includes a CPU 52 and a laser driver 54 for controlling the amount of power supplied to the laser diode 32 of the optical pickup 30, and the optical disk according to the firmware F stored in the storage means 60 in advance. The operation of each component of the apparatus 10 is controlled.

  The storage means 60 stores the type of the optical disk 20 (digital multipurpose disk (DVD) or compact disk (CD), R, RW, RAM, how many times the data writing speed is, etc.). The corresponding correction strategy HST and correction beta value HB are stored in advance. The correction strategy HST and the correction beta value HB are calculated in advance by an experiment or the like by an optical disc apparatus manufacturer.

Each of the correction strategy HST and the correction beta value HB will be specifically described.
First, the correction strategy HST will be described. As shown in FIG. 2, the optimum conditions for the optical disc 20 (strategies calculated empirically by the optical disc apparatus manufacturer in accordance with the type of the optical disc 20, the media manufacturer, etc., and the data recording conditions of the laser light output). In other words, the optimum deviation immediately after the data is recorded under the condition that the data recording quality immediately after the data is written on the optical disk) and the deterioration in the state where the optical disk 20 on which the data is recorded under the optimum condition is deteriorated. The measurement is measured by a measurer using, for example, a general personal computer (hereinafter referred to as a PC), and stored in a storage means that can be used in the PC or the like.
The control means (for example, CPU) of the PC used for the measurement calculates the corrected deviation by changing the optimum deviation from the optimum deviation state to the changed state which is the reverse of the changed deviation state. The strategy capable of obtaining the corrected deviation calculated in this way can be calculated by the control means of the PC based on the optimum strategy. The strategy obtained in this way is used as a correction strategy HST.

Next, the corrected beta value HB will be described. Similarly to the correction strategy HST, the correction beta value HB is also calculated in advance by an experiment or the like by the optical disk device manufacturer. As shown in FIG. 3, the measurer uses a PC or the like to determine the optimum beta value immediately after data is recorded on the optical disk 20 and the deteriorated beta value when the optical disk 20 on which data is recorded under the optimum condition is deteriorated. Each is measured and stored in a storage means that can be used in a PC or the like used for measurement.
The CPU of the PC used for the measurement calculates the corrected beta value HB by changing the optimum beta value from the optimum beta value state to the changed state opposite to the deteriorated beta value state. The beta value obtained in this way is used as a corrected beta value HB.

As described above, the correction deviation and the correction beta value are changed by the control means such as a PC used for measurement to change the respective optimum state from the optimum state to the deteriorated state. The absolute value of the change state (degree of change) that has changed from the optimal state to the deteriorated state, and the absolute value that changes the optimal state from the optimal state to the change state opposite to the change state The values do not necessarily have to match.
As long as the data state recorded on the optical disc 20 can be reproduced, the optimum deviation and the degree of change from the optimum beta value when calculating the corrected deviation HDB and the corrected beta value HB can be changed as appropriate. is there.

Next, a processing procedure for writing data to the optical disc 20 loaded in the optical disc apparatus 10 will be described. FIG. 4 is a flowchart showing a procedure for writing data to the optical disc loaded in the optical disc apparatus.
When the user mounts the optical disk 20 on the optical disk apparatus 10 according to the present invention (step 1), the CPU 52 uses the reflected light signal from the lead-in area to make a media maker of the optical disk 20 mounted on the optical disk apparatus 10 or the optical disk 20. Type (digital multipurpose disc (DVD) or compact disc (CD), R, RW, RAM, how many times the data writing speed is, etc.)) is determined (step 2).

After the type of the mounted optical disk 20 is determined, the control unit 50 reads out from the storage unit 60 the correction strategy HST and the correction beta value HB that are suitable for the optical disk 20 mounted in the optical disk device 10 (step 3). Thereafter, the CPU 52 calculates the laser light output by executing the OPC operation with the corrected beta value HB as the target value in the mounted optical disk 20 (step 4). The control means 50 temporarily stores the laser light output thus obtained as the corrected laser light output HLP in the storage means 60 (step 5).
The laser driver 54 records data on the optical disc 20 while controlling the operation of the laser diode 32 of the optical pickup 30 using the correction strategy HST and the correction laser light output HLP read from the storage means 60 (step 6).

FIG. 5 is a graph showing changes in beta value and deviation index quality when the same data on the same optical disk is recorded using the conventional technique and the technique according to the present invention. FIG. 6 is a graph showing the change over time in the overall quality of recorded data when the same data is recorded on the same optical disk using the prior art and the technology according to the present invention.
If data recording based on the correction strategy HST and the correction laser light output HLP is executed, the deviation of the reflected light signal after the data recording and the index quality of the beta value change once improved as shown in FIG. It will show a gradual decline. The index quality of the deviation and the beta value directly affects the quality of data writing to the optical disc 20, and therefore when the change in the index quality of the deviation and the beta value changes as shown in FIG. A change with time in the data writing quality indicates a change state as shown in FIG.

  As is apparent from FIG. 6, data is written to the optical disc 20 with the correction strategy HST and the correction beta value HB as compared to the change over time of the data recording quality when the data is written to the optical disc 20 with the optimal strategy and the optimal beta value. In this case, the temporal change in the data recording quality is slightly lower immediately after the data recording, but it is higher except for immediately after the data recording. In addition, in the data recorded on the optical disc, it takes a long time to satisfy the error correction possible level. That is, by writing data to the optical disc 20 using the correction strategy HST and the correction beta value HB (correction laser light output), data is written using the optimal strategy and the optimal beta value (optimum laser light output). Compared with the optical disc 20, the lifetime can be increased.

By the way, the change in the strategy mainly affects the deviation, but also slightly affects the beta value. On the other hand, the change in the output power of the laser beam for writing data mainly affects the beta value, but also slightly affects the deviation.
That is, as described in the previous embodiment, when writing data to the optical disc 20, it is not always necessary to apply both the correction strategy HST and the correction beta value at the same time. Even when only one of the correction strategy HST and the correction beta value is employed, the life of the data recording quality of the optical disc 20 can be extended.

  Specifically, a correction strategy HST and an optimum beta value corresponding to the type of the optical disk 20 are stored in advance in the storage device 60 of the optical disk apparatus 10, and when the optical disk 20 is mounted on the optical disk apparatus 10, the mounted optical disk After the 20 types are discriminated, the correction strategy HST and the optimum beta value corresponding to the loaded optical disk 20 are read from the storage means, and then a normal OPC operation is performed to output the data writing laser light to the optical disk 20 The data may be written to the optical disc 20 based on the correction strategy HST and the normal data writing laser light output (optimum laser light output) (another embodiment 1).

  Further, only the optimum strategy and the corrected beta value HB corresponding to the type of the optical disk 20 are stored in advance in the storage device 60 of the optical disk apparatus 10, and when the optical disk 20 is loaded in the optical disk apparatus 10, After the type is discriminated, the optimum strategy and the corrected beta value HB corresponding to the mounted optical disk 20 are read from the storage means, and then the OPC operation is executed with the corrected beta value HB as the target value, and data is written to the optical disk 20 The laser light output (corrected laser light output HLP) may be obtained, and data may be written on the optical disc 20 based on the corrected laser light output HLP and the optimum deviation (other embodiment 2).

  Even in the optical disc 20 in which data is recorded according to these other embodiments 1 and 2, the temporal change in the recording quality of the data becomes a graph as shown in FIG. Compared to the case of recording, the data recording quality can be extended.

As yet another embodiment, the storage unit 60 of the optical disc apparatus 10 stores in advance the optimal strategy, the optimal beta value, the correction strategy HST, and the correction beta value HB corresponding to the type of the optical disc. After recording, the data recording method to the optical disc 20 is performed by a normal method (the optimum strategy and the optimum beta value are used and the data recording quality immediately after the data recording is the highest), or the data recording method to the optical disc 20 is changed. A mode in which an input means is provided so as to be selectable by a method for extending the life (a method for recording data on the optical disc 20 using at least one of the correction strategy HST and the correction beta value HB). It is also good. The input means here may be a key provided on the optical disc apparatus 10 main body, a keyboard of a PC to which the optical disc apparatus 10 is connected, a mouse, and data writing software.
Further, when the data recording method is selected to have a long life, the user selects the combination of the correction strategy HST and the correction beta value HB, and then uses the input means described above. It is more preferable that the input is set to enable input.

Although the present invention has been described above based on the embodiments, the present invention is of course not limited to the above embodiments.
In short, the strategy and / or laser light output is removed from the optimum condition and data is written to the optical disc 20, so that the deviation and / or beta value immediately after data recording on the optical disc 20 is changed from the optimum deviation and / or optimum beta value. It is only necessary that the recording quality of the data recorded on the optical disc 20 can be maintained over a long period of time by removing it.

It is a block diagram which shows the structure of the optical disk apparatus in 1st Embodiment. It is explanatory drawing which shows the correlation of optimal deviation, degradation deviation, and correction | amendment deviation. It is explanatory drawing which shows the correlation of an optimal beta value, a degradation beta value, and a correction | amendment beta value. It is a flowchart which shows the data write-in process procedure to the optical disk with which the optical disk apparatus was mounted | worn. It is a graph showing the relationship between the beta value, the quality of the deviation, and the elapsed time when the same data on the same optical disk is recorded using the technology according to the prior art and the present invention. It is a graph showing the relationship between the overall quality of recorded data and the elapsed time when the same data is recorded on the same optical disk using the technology according to the prior art and the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk apparatus 20 Optical disk 30 Optical pick-up 32 Laser diode 34 Photo diode 40 RF amplifier 50 Control means 52 CPU
54 Laser diode 60 Memory means 70 Encoder

Claims (7)

In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup,
In order to maintain the error-correctable level of the reflected light signal when reading the data recorded on the optical disc for a long period of time, the data is recorded at the time of data recording so that the optimum deviation is obtained when the deviation changes with the aging of the optical disc. An optical disc apparatus comprising control means for controlling the optical pickup so as to record the data on the optical disc by removing the deviation from the optimum deviation. In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup,
In order to maintain the error-correctable level of the reflected light signal when reading the data recorded on the optical disc over a long period of time, the data is set so that the optimum beta value is obtained when the beta value changes with the aging of the optical disc. An optical disc apparatus comprising control means for controlling the optical pickup so that a beta value at the time of recording is removed from an optimum beta value and data is recorded on the optical disc. In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup,
In order to maintain the error-correctable level of the reflected light signal when reading the data recorded on the optical disc over a long period of time, when the deviation and the beta value change with the aging of the optical disc, at least the deviation or the beta value Control means for controlling the optical pickup so as to record the data on the optical disc by removing the deviation and the beta value at the time of data recording from the optimum deviation and the optimum beta value so that one of them is in an optimum state. An optical disk device. In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, for the purpose of maintaining a level capable of error correction of a reflected light signal when reading data recorded on the optical disc for a long period of time,
Using the optimum deviation immediately after the data is recorded under the optimum condition and the degradation deviation after the deterioration of the optical disc on which the data is recorded under the optimum condition,
A strategy for obtaining a correction deviation obtained by changing the optimum deviation from a state where the optimum deviation is changed to the deteriorated deviation is stored in advance as a correction strategy corresponding to the type of the optical disc. Comprising storage means;
The control means includes
After the optical disk is mounted, the type of the mounted optical disk is specified, and then a correction strategy corresponding to the specified type of optical disk is extracted from the storage means, and the light is extracted using the extracted correction strategy. An optical disk apparatus, wherein data is recorded on the mounted optical disk by a pickup. In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, for the purpose of maintaining a level capable of error correction of a reflected light signal when reading data recorded on the optical disc for a long period of time,
Using the optimum beta value immediately after the data is recorded under the optimum condition and the degradation beta value after the deterioration of the optical disc on which the data is recorded under the optimum condition,
Storage means for storing in advance a correction beta value obtained by changing the optimum beta value from a state where the optimum beta value is changed to the deteriorated beta value in a state opposite to the changed beta value, corresponding to the type of the optical disc. Equipped,
After the optical disk is mounted, the control means identifies the type of the mounted optical disk, extracts a corrected beta value corresponding to the specified optical disk type from the storage means, and then calculates the corrected beta value. An optical disc apparatus characterized in that a correction laser beam output is determined by an OPC operation as a target value, and data is recorded on the mounted optical disc by the optical pickup using the correction laser beam output. In an optical disc apparatus that records data on an optical disc by laser light emitted from an optical pickup, for the purpose of maintaining a level capable of error correction of a reflected light signal when reading data recorded on the optical disc for a long period of time,
Using the optimum deviation and the optimum beta value immediately after the data is recorded under the optimum condition, and the degradation deviation and the deteriorated beta value after the deterioration of the optical disc on which the data is recorded according to the optimum condition,
The strategy for obtaining the correction deviation obtained by changing the optimum deviation from the optimum deviation to the deterioration deviation is changed to a correction strategy, and the optimum beta value is changed to the deteriorated beta value. A storage unit that stores in advance a correction beta value that is obtained by changing the optimum beta value to a change state opposite to the changed state, and stores the correction strategy and the correction beta value in advance corresponding to the type of the optical disc. Comprising
The control means includes
After the optical disk is mounted, the type of the mounted optical disk is specified, and the correction strategy and the correction beta value corresponding to the specified optical disk type are extracted from the storage unit, respectively.
An OPC operation is performed using the corrected beta value as a target value, a corrected laser light output is determined, and data is recorded on the mounted optical disk by the optical pickup using the correction strategy and the corrected laser light output. Optical disk device to perform. In the storage means, an optimal strategy for recording data on the optical disc in an optimal state and an optimal beta value are also stored in advance in a state corresponding to the type of the optical disc,
At least one of a strategy and a beta value to be used when the control unit records data on the optical disc, the optimal strategy, the correction strategy, the optimal beta value, and the corrected beta value stored in the storage unit 7. The optical disk device according to claim 4, further comprising an input unit that can be selected by a user.

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