JP2003141777A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk in which intrinsic data regarding the individual difference of the physical structure of an optical disk itself can be integrally held, and the intrinsic data can be effectively used. SOLUTION: The optical disk 3 where data is recorded and/or reproduced is provided with a data recording area 5 where the data is recorded by molding, and an intrinsic data recording area 6 where intrinsic data regarding the individual difference of the physical structure of the optical disk 3 itself is recorded after the molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc on which data is recorded and / or reproduced.

[0002]

2. Description of the Related Art With the recent development of the information industry, data is distributed in various recording media in a recorded state. For example, CD (Compact Disc: trade name)
In such a recording medium, data is recorded in advance through a molding process. As described above, since the data is created by the molding process, the same data is recorded on each recording medium. Such a read-only recording medium has a characteristic that it cannot be recorded again.

On the other hand, for example, a DVD (Digital V
Recording media such as ersatile disc (trademark) have BCA (Burst Cutt) on the inner peripheral side.
A recording area for unique data called "ing Area" is provided. In this BCA, a bar code is recorded on a disc near the center hole of a DVD with a high power laser such as a YAG laser. The barcode writing on the recording medium is performed after the molding process is completed.

Since the content of the bar code can be freely selected, it is possible to record unique data such as serial numbers, which are different for each recording medium, on each recording medium. For example, a DVD-ROM drive can read BCA bar code information using an optical pickup using laser light. The amount of data that can be recorded in this BCA is, for example, about 188 bytes.

In addition to the data already recorded in the data recording area, this recording medium also has a BCA.
The serial number and identification number of the recording medium are recorded in. Therefore, the recording medium having such a BCA can be distinguished from other recording media by the serial number or the like. Therefore, in the conventional recording medium, data other than such a serial number has never been recorded in the BCA.

[0006] Here, taking a disk as an example of the recording medium, for example, an optical disk molded by a molding process in a manufacturing line is evaluated for its physical shape by an evaluation device. In this evaluation device, the reference disk and the molded optical disk are compared and evaluated.

In such a production line, a large number of discs are generally evaluated by a plurality of evaluation devices, and the reference disc itself is also manufactured by a predetermined molding process. Therefore, the physical structure of each reference disk is slightly different. For this reason, in the conventional evaluation device, a reference disk with attached paper or the like on which the measurement results that have been measured for calibration are described is used, and the difference between the measurement results is calibrated and the optical disks formed are calibrated. Evaluating. Specifically, when evaluating a disc with an evaluation device, the measurement result is manually read from a paper or the like on which the measurement result is written, a calibration value is obtained from the measured value, and there is a variation in the evaluation of each evaluation device. The evaluation device was calibrated so that it would not occur.

[0008]

However, it is difficult to manage such that the paper in which such measurement results are described is put in a case or the like and attached to the reference disc so that they are not separated. There was a point.

Therefore, the present invention can solve the above-mentioned problems and can hold the unique data concerning the individual difference of the physical structure of the optical disk as a unit and make the unique data effectively used. While you can
It is an object of the present invention to provide an optical disc capable of effectively utilizing its unique data.

[0010]

The above object is, in the invention of claim 1, an optical disc on which data is recorded and / or reproduced, and a data recording area in which the data is recorded by molding. An optical disc, which is provided with a unique data recording area in which unique data regarding an individual difference in physical structure of the optical disc itself is recorded after molding. According to the structure of claim 1, in the peculiar data recording area of the optical disc, after molding, the peculiar data relating to the individual difference in the physical structure of the optical disc itself, not the serial number not related to the physical structure of the optical disc itself. Is recorded. When there are a plurality of optical disks, the unique data of each optical disk differs according to the physical structure, and different unique data is recorded in the unique data recording area of each optical disk. Therefore, by reading the unique data from the unique data recording area of each optical disc, the physical structure of each optical disc can be grasped. For this reason, each optical disc has its own unique data recorded in the unique data recording area even if it is not attached with the unique data regarding the individual difference in its physical structure on a paper surface as in the past. It will be held as one.

According to a second aspect of the present invention, in the configuration of the first aspect, the optical disc is an evaluation device for evaluating a physical structure of another manufactured optical disc, and is compared with the other optical disc. It is characterized by being a reference disk of. According to the configuration of claim 2, in addition to the operation of claim 1, the evaluation device compares and evaluates another manufactured optical disc and the reference disc with respect to the physical structure. Therefore, the evaluation device can calibrate the error in the physical structure of the reference disk itself based on the unique data recorded on each reference disk, and accurately evaluate other optical disks.

According to a third aspect of the present invention, in the configuration of the second aspect, the unique data recorded in the unique data recording area is for calibration for calibrating the reference disk having an individual difference in physical structure. It is characterized by being data. According to the configuration of claim 3, in addition to the operation of claim 2, by performing calibration with the calibration data, it is possible to absorb the physical individual difference of the optical disc and accurately evaluate other optical discs.

According to a fourth aspect of the invention, in the configuration of the third aspect, in addition to the calibration data, calibration correction data for correcting the calibration data is recorded in the unique data recording area. It is characterized by Claim 4
According to the configuration, in addition to the effect of the first aspect, by correcting with the correction data for calibration, it is possible to absorb the physical individual difference of the optical disk and to evaluate other optical disks more accurately.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limitations are given, the scope of the present invention is not limited to these forms unless otherwise specified in the description below.

FIG. 1 is a plan view showing a configuration example of an optical disc 3 as a preferred embodiment of the present invention. The optical disc 3 is a disc-shaped information recording medium in which data is recorded and / or reproduced by using light. This optical disc 3
Is a reference disc for evaluation in comparison with the above-mentioned other optical discs in an evaluation device for evaluating the physical structure of the other optical discs manufactured on the production line. Hereinafter, this optical disc 3 will be referred to as "reference disc 3".
Say. The reference disk 3 has a data recording area 5 extending from the inner circumference side to the outer circumference side, and for example, a unique data recording area 6 is provided on the inner circumference side.

Data is recorded in advance in the data recording area 6 by, for example, a molding process. On the other hand, in the unique data recording area 6, it is possible to additionally record unique data (hereinafter referred to as “unique data”) regarding individual differences in the physical structure of the reference disk 3 itself after molding. As a specific example of the unique data recording area 6, for example, DV
D (Digital Versatile Disc:
If it is a trademark name), for example, BCA may be used. The reference disc 3 is a disc having data additionally recorded on the inner peripheral side of the reference disc 3 by a method called BCA after a normal molding process. As a result, each reference disk 3
It can hold different data. The specific data is, for example, calibration data (calibration data) for calibrating variations in the physical structure of the reference disk 3 itself, which is used as a reference for comparative evaluation in the evaluation device. In the following description, “calibration data” is exemplified as the unique data. The calibration data is, for example, skew-related information described later.

The calibration data may be mechanical parameters such as the angular displacement of the reference disk 3 and the average displacement of one rotation. If such mechanical parameters are used as calibration data, this reference disk 3
The reference disk 3 itself can hold the calibrated values of the mechanical parameters of, and the values can be referred to anytime, anywhere, and it is convenient because the configuration values and the reference disk 3 are not separated. At the same time,
It is possible to automate the measurement and calibration by reading with an automatic measuring device.

Further, the calibration data may be optical parameters such as reflectance and birefringence of the reference disk 3, for example. When such an optical parameter is used as calibration data, the calibration value of the mechanical parameter of the reference disk 3 can be held by the reference disk 3 itself, and the value can be referred to anytime, anywhere.
It is convenient not to say that the constituent values and the reference disk 3 are disjointed, and at the same time, the measurement and calibration can be automated by reading with an automatic measuring device.

Further, the calibration data may be, for example, information about a defect such as an error position or an error size due to a scratch or the like generated on the reference disk 3. When the information regarding such defects is used as the calibration data, different errors are generated in the reference discs 3, so that different calibration data is recorded in the unique data recording area 6 of each reference disc 3. . Therefore, it is determined that the plurality of reference discs 3 are different from each other, and the evaluation device evaluates the structure of other manufactured optical discs according to the physical structure of each reference disc 3. You can

Further, the calibration data may be, for example, a high frequency (HF) signal such as asymmetry of the modulated amplitude signal or crosstalk.

FIG. 2 is a diagram showing an example of how physical data is recorded on the molded reference disk 3. The skew measuring device 13 is connected to the control computer 19 and has a function of measuring the skew of the reference disk 3 under the control of the control computer 19, although a specific configuration will be described later. The skew value of the reference disk 3 measured by the skew measuring device 13 is output to the control computer 19.

The control computer 19 is connected to the skew measuring device 13 and the data recording device 17, and controls the skew measuring device 13 and the data recording device 17, although the specific configuration will be described later.

The data recorder 17 is connected to the control computer 19 and has a function of recording the calibration data on the reference disk 3 under the control of the control computer 19, although a specific configuration will be described later.

FIG. 3 is a block diagram showing a configuration example of the control computer 19 of FIG. Control computer 19
Is a CPU 21, a storage unit 25, a display unit 27, an operation unit 23.
And an interface unit 29.

The CPU 21 includes a display unit 27, a storage unit 25,
The central processing unit is connected to the operation unit 23 and the interface unit 29 and controls them. The storage unit 25 is an information recording medium such as a memory and a hard disk. The operation unit 23 is an operation means such as a mouse or a keyboard. The display unit 27 is a liquid crystal display or a CRT.
It is a display means such as (Cathode Ray Tube). The interface unit 29 is an interface for electrically connecting to the skew measuring device 13 and the data recorder 17.

FIG. 4 is a block diagram showing a configuration example of the skew measuring device 13 of FIG. The skew measuring device 13 includes an interface unit 39, a control unit 37, and a skew measuring unit 3.
1, a motor controller 35 and a motor 33. The control unit 37 includes an interface unit 29 and a skew measuring unit 3.
1. It is connected to the motor control unit 35 and controls them. The interface unit 39 is an interface for electrically connecting to the control computer 19. The motor control unit 35 is a control unit for controlling driving of the motor 33 for rotating the reference disk 3 in the R direction.

The skew measuring section 31 has a function of measuring the skew of the rotating reference disk 3 and acquiring the skew value under the control of the control section 35. The acquired skew value is output from the interface unit 39 to the control computer 19 under the control of the control unit 37.

FIG. 5 is a block diagram showing a configuration example of the data recorder 17 of FIG. The data recorder 17 includes an interface unit 49, a control unit 47, a recording unit 41, a motor control unit 45, and a motor 43. The control unit 47 is connected to the interface unit 49, the recording unit 41, and the motor control unit 45, and controls these. The interface unit 49 is an interface for electrically connecting to the control computer 19. Motor control unit 45
Is a control means for controlling the drive of the motor 43 for rotating the reference disk 3 in the R direction.

The recording section 41 has a function of recording the calibration data in the unique data recording area 6 of the rotating reference disk 3 under the control of the control section 35. This calibration data is acquired via the interface unit 49, and the control unit 47 causes the motor control unit 45 to rotate the reference disc 3 and causes the recording unit 41 to perform calibration on the unique data recording area 6 of the reference disc 3. Have the data recorded.

The reference disc 3 and the like are configured as described above. Next, with reference to FIGS. 1 to 5, an optical disc manufactured on a production line with the reference disc 3 as a reference (other optical discs will be evaluated). An example of the evaluation method will be described below, and the following description will be made by exemplifying the information regarding the skew as the calibration data.

Measurement Process FIG. 6 is a flowchart showing an example of a procedure for recording physical data on the molded reference disk 3, and FIG. 7 is a diagram showing an example of calibration data. Step ST of FIG.
In 1, the measurement is first started. Next, at step ST2, the skew of the reference disk 3 is measured by the skew measuring device 13 shown in FIG. Next, in step ST3, the measurement data as the measurement result is sent to the control computer 1.
Predetermined processing is performed by 9 to generate calibration data. Next, in step ST4, the calibration data is transferred to the calibration data recorder 17 (recorder).

Next, in step ST5, the calibration data recorder 17 records the calibration data in the unique data recording area 6 of the molded reference disk 3. Therefore, the reference disk 3 has a structure in which calibration data is integrated.

If there are a plurality of reference disks 3, each of the reference disks 3 has a different structure.
Therefore, referring to the physical data recorded in the unique data recording area 6 of each reference disk 3, each reference disk 3
You can understand what kind of physical structure is. That is, by referring to the physical data recorded on the reference disk 3, the reference disk 3 and other reference disks (not shown) can be distinguished with respect to their physical structures.

Calibration Process Next, the calibration process will be described with reference to FIG.
FIG. 8 is a diagram showing an example of how an evaluation device (not shown) is calibrated, and FIG. 9 is a flowchart showing an example of the calibration process. The skew measuring device 13 shown in FIG.
Has the same configuration as the skew measuring instrument 13 shown in FIG. 10A is a diagram showing an example of the calibration data already recorded in the unique data recording area 6 of the reference disc 3, and FIG. 10B is a measurement of the physical structure of the reference disc 3. It is a figure which shows an example of data and correction data for calibration.

The calibration of the evaluation device is started in step ST11 of FIG. 9, and the calibration value is obtained as follows. First, in step ST12, an evaluation device (not shown) is equipped with the reference disk 3, and the evaluation device measures, for example, data (measurement data) regarding the skew of the reference disk 3. Next, in step ST13, the calibration data recorded in the unique data recording area 6 of the reference disk 3 is read by the skew measuring device 13 as shown in FIG.

Next, in step ST14, the control computer 19 of FIG. 8 compares the measurement data with the calibration data. When there is a difference between the physical data and the calibration data, the control computer 19 can recognize that there is an individual difference in the physical structure of the reference disk 3. In other words, this reference disk 3 should be the same as the master disk to be the reference for evaluation, but has a physically different structure.

Next, in step ST15, the control computer 19 adjusts the skew angle measurement value as an example of the measured measurement data shown in FIG. 10A so as to match the measurement data shown in the middle column of FIG. 10B. , The skew angle as the correction data for calibration shown in the right column of FIG. 10C is calculated.
This calibration correction data is used to calibrate an error that cannot be absorbed by the difference in the evaluation device itself even if the difference between the plurality of reference disks 3 is absorbed by the calibration data recorded in the unique data recording area 6 of the reference disk 3. It is data for doing. Next, in step ST16, the calibration data corrected by the calibration correction data is set in the evaluation device.

Evaluation Processing FIG. 11 is a diagram showing an example of how a plurality of optical disks 3a manufactured by the disk molding machines 9a, 9b are evaluated by the evaluation devices 11a, 11b. The evaluation devices 11a and 11b each have a function of performing, for example, skew measurement and evaluation. These evaluation devices 11
Reference disks 3 having substantially the same physical structure are provided on a and 11b. As described above, calibration data is recorded in the unique data recording area 6 after molding on each of the plurality of reference disks 3.

First, the evaluation devices 11a and 11b automatically obtain the calibration data from the unique data recording area 6 of each reference disk 3. Next, each evaluation device 11a, 1
1b performs calibration in consideration of the difference in the physical structure of each reference disk 3 according to the calibration data. Therefore, each of these evaluation devices 11a and 11b can automatically evaluate the molded optical disk after automatically considering the individual difference.

According to an embodiment of the present invention, the optical disc 3
It is possible to provide the optical disc 3 capable of integrally holding the unique data regarding the individual difference in its physical structure. That is, according to the present embodiment, by additionally recording the calibration data specific to the reference disc 3 on the reference disc 3, the affinity between the calibration data specific to the reference disc 3 and the system for reading it is improved. , Automation and other applications are expanded. Further, according to the present embodiment, since the calibration data is stored in the reference disk 3, it is possible to prevent the unique calibration data from being lost. Since such calibration data is recorded on the reference disc 3, the evaluation device can automatically perform calibration. Therefore, the evaluation device can perform accurate evaluation.

The present invention is not limited to the above embodiment. In the above embodiment, the BCA is used as the unique data recording area 6, for example.
The method is not limited to this, and another method can be adopted. Other methods include, for example, CD-R (Compact D
It is also possible to adopt a disc type called “hybrid disc” which has both the functions of a recorded disc and a recordable disc, to which isc-recordable) technology is applied.

In this "hybrid disc", usually, data or pregram fixed to the inner peripheral portion is written in the factory by the same method as CD (Compact Disc: trade name). On the other hand, the outer peripheral portion has a recording layer of an organic dye such as CD-R, and is a disc developed for the purpose of recording data that can be produced when the customer uses the above-mentioned program on the same recording medium. .

In the present embodiment, the data portion to be measured required for the data recorded portion in the first half is prepared by mastering, the data in the portion is measured, and the data required for the recordable disc portion is set in the factory. It can also be applied to the test disc additionally recorded in. In this case, as the writing device, for example, a CD-R writer can be used for writing.

A part of each structure of the above-mentioned embodiments can be omitted, or can be arbitrarily combined differently from the above.

[0045]

As described above, according to the present invention,
It is possible to provide an optical disc that can hold unique data related to individual differences in the physical structure of the optical disc itself as a unit and can effectively use the unique data.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration example of an optical disc as a preferred embodiment of the present invention.

FIG. 2 is a diagram showing an example of how physical data is recorded on a molded reference disc.

3 is a block diagram showing a configuration example of a control computer in FIG.

FIG. 4 is a block diagram showing a configuration example of the skew measuring device in FIG.

5 is a block diagram showing a configuration example of the data recorder of FIG.

FIG. 6 is a flowchart showing an example of a procedure for recording physical data on a molded reference disk.

FIG. 7 is a diagram showing an example of measurement results.

FIG. 8 is a diagram showing an example of how an evaluation device (not shown) is calibrated.

FIG. 9 is a flowchart showing an example of calibration processing.

FIG. 10 is a diagram showing an example of calibration data.

FIG. 11 is a diagram showing an example of how a plurality of optical disks manufactured by a disk molding machine are evaluated by an evaluation device.

[Explanation of symbols]

3 ... Optical disc, 5 ... Data recording area, 6 ...
・ Unique data recording area

Claims (4)

[Claims] 1. An optical disc on which data is recorded and / or reproduced, wherein a data recording area in which the data is recorded by molding, and unique data relating to individual differences in physical structure of the optical disc itself after molding. An optical disc having a unique data recording area to be recorded. 2. The optical disk is an evaluation device for evaluating the physical structure of another manufactured optical disk,
The optical disc according to claim 1, wherein the optical disc is a reference disc for comparison with the other optical discs. 3. The unique data recorded in the unique data recording area is calibration data for calibrating the reference disk having an individual difference in physical structure. The described optical disc. 4. The correction data for calibration for correcting the calibration data is recorded in addition to the calibration data in the unique data recording area. optical disk.