JP2017004575A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device which allows information of BCA to be properly read even when a disk medium is changed.SOLUTION: A disk information acquisition unit 71 acquires disk information for specifying a disk d. In a BCA recording position database 80, a movement control amount of an optical pickup 2 which has successfully read information of BCA of the disk d is stored in association with the disk information. A search unit 72 searches for the movement control amount associated with the disk information acquired by the disk information acquisition unit 71, in the BCA recording position database 80. A control unit 70 causes the optical pickup 2 to read information of BCA of the disk d on the basis of the movement control amount found by the search unit 72.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a disk device for reading / writing information from / to a disk medium having a burst cutting area.

  2. Description of the Related Art Conventionally, a technique for preventing unauthorized copying of content recorded on a disc medium using disc-specific identification information has been widespread. The content is recorded on the disc in a state scrambled by this identification information. Therefore, even if only the content is copied to another disc, the content cannot be unscrambled without this identification information.

Since disc-specific identification information is used as described above, it is not recorded in a normal track area, but is recorded in a burst cutting area (hereinafter referred to as BCA).
The BCA is an area provided on the inner periphery of the disc, and the identification information is recorded as a slit pattern formed by partially burning the BCA recording film. This slit pattern is formed at the manufacturing stage of the disk and cannot be formed by a normal disk device.

The information recorded on the BCA is read as digital information indicated by the slit pattern, and the recording position is not managed by the address information as in the track area. For this reason, high-speed access to the recording position based on the address information is impossible.
Further, since the BCA is a ring-shaped narrow area provided in the inner periphery of the disk, information reading failure due to disk eccentricity is likely to occur.

On the other hand, for example, in the disk recording / reproducing apparatus described in Patent Document 1, when reading the information from the BCA, the beam spot is set to the BCA so that the beam spot of the optical head does not deviate from the BCA even if the disk is decentered. Is located in the center of
In order to control the optical head in this way, the disk recording / reproducing apparatus moves the optical head to the radial start edge of the BCA and then further traverses the BCA, and based on the time taken for this traversal, The application time of the driving force to move to the center position is estimated.

JP 2005-85415 A

  Since the eccentricity of the disc has an individual difference for each disc, even if the grant time is determined for one disc, the grant time cannot always be used for other discs. For example, the beam spot may not be positioned at the center of the BCA of the disk B even if the optical head is moved with the application time determined for the disk A. For this reason, it is necessary to estimate the application time every time the disk changes. Therefore, before the content recorded on the disc is reproduced, it is necessary to estimate the grant time by traversing the BCA with the optical head, so that a delay in the reproduction start time is inevitable.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a disk device that can appropriately read BCA information even if the disk medium is changed.

The disk device according to the present invention includes an acquisition unit, a database, a search unit, and a control unit.
The acquisition unit acquires disk information for specifying a disk medium. In the database, the movement control amount of the optical pickup that has succeeded in reading the BCA information of the disk medium is stored in association with the disk information. The search unit searches the database for a movement control amount corresponding to the disk information acquired by the acquisition unit. The control unit causes the optical pickup to read the BCA information of the disk medium based on the movement control amount searched by the search unit.

  According to the present invention, the movement control amount corresponding to the disk information is read out from the database in which the movement control amount of the optical pickup that has been successfully read out of the BCA information of the disk medium is stored in association with the disk information. Therefore, even if the disk medium is changed, the BCA information can be read appropriately.

It is a figure which shows the hardware constitutions of the disk apparatus based on Embodiment 1 of this invention. It is a block diagram which shows the function structure of CPU of FIG. It is a figure which shows the outline | summary of the recording area of a disc medium. 3 is a flowchart showing the operation of the disk device according to the first embodiment.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a hardware configuration of a disk device 1 according to Embodiment 1 of the present invention. FIG. 1 shows only the main part of the disk device 1 according to the present invention, and illustration of well-known components in the optical disk recording / reproducing apparatus other than the components shown in FIG. 1 is omitted. The disc device 1 is a device that records information on and reproduces information from the disc d, and is realized, for example, as a disc device of an audio device mounted on a vehicle.

  The optical pickup 2 is a pickup that reads a signal from the data recording area of the disk d. The optical pickup 2 has a drive mechanism that drives the objective lens in the focus direction. Laser light from the light source is condensed on the recording surface of the disk d by the objective lens.

  The transport mechanism 3 transports the optical pickup 2 in the radial direction of the disk d by the driving force of the motor 4. The motor 4 is a stepping motor that applies a driving force to the transport mechanism 3 to drive the optical pickup 2 for every fixed feed amount. The amplifier 5 is an amplifier that amplifies a control signal output from the servo unit 9 to the motor 4. The transport mechanism 3, the motor 4, and the amplifier 5 constitute a feeding mechanism for the optical pickup 2.

The A / D converter 6 converts a signal read from the disk d by the optical pickup 2 into a digital signal and outputs the digital signal to a CPU (Central Processing Unit) 7.
The CPU 7 executes the program read from the memory 8 and controls the servo unit 9.
The program stored in the memory 8 is a program in which functions described later with reference to FIG. 2 are described. The servo unit 9 controls the optical pickup 2 to perform servo processing. Servo processing includes tracking servo and focus servo. The A / D converter 6, the CPU 7, the memory 8, and the servo unit 9 constitute an arithmetic processing unit of the disk device 1.

FIG. 2 is a block diagram showing a functional configuration of the CPU 7. As shown in FIG. 2, the CPU 7 includes a control unit 70, a disk information acquisition unit 71, a search unit 72, and a determination unit 73. The memory 8 stores a BCA recording position database 80.
The memory 8 is a non-volatile memory so that the storage of the BCA recording position database 80 is maintained even when the power supply to the disk device 1 is stopped.

  The control unit 70 is a control unit that controls the servo unit 9 to execute various servo processes. Further, the control unit 70 controls the servo unit 9 based on the movement control amount of the optical pickup 2 retrieved from the BCA recording position database 80, and drives the optical pickup 2 to read the BCA information of the disk d. The movement control amount of the optical pickup 2 is the inner circumferential feed amount of the optical pickup 2 when accessing the BCA, for example, the feed amount sent to the inner circumference by a distance of half the BCA width from the BCA start position. is there.

The disc information acquisition unit 71 embodies the acquisition unit of the present invention, and acquires disc information for specifying the disc d. The disc information includes at least information indicating the manufacturer of the disc d. In addition to this, there is information indicating the disc type, the number of layers, the region code, the storage capacity, and the recording speed.
The disk type is the type of the disk d, and is, for example, DVD-R, DVD-RW, DVD-RAM, DVD-ROM, BD (Blu-ray Disc; registered trademark, omitted from the following description) -RE, BD. -R, BD-ROM.
Note that the recording position of the slit pattern formed on the BCA generally depends on the disk manufacturing specifications of the disk d manufacturer.
That is, of the information included in the disc information, information indicating the manufacturer of the disc d is the most dominant information for recording information in the BCA.

The search unit 72 searches the BCA recording position database 80 for a movement control amount corresponding to the disc information acquired by the disc information acquisition unit 71. The movement control amount obtained as a search result is sent from the search unit 72 to the control unit 70.
The determination unit 73 inputs information read from the BCA by the optical pickup 2 via the A / D converter 6 and determines whether or not the information has been successfully read from the BCA based on this information. . The determination result is notified from the determination unit 73 to the control unit 70.

The BCA recording position database 80 embodies the database according to the present invention, and stores the movement control amount of the optical pickup 2 that has successfully read the BCA information of the disk d in association with the disk information.
In addition, the control unit 70 associates the movement control amount of the optical pickup 2 when the determination unit 73 determines that reading of information from the BCA is successful with the BCA recording position database 80 in association with the disk information of the disk d. Remember. Thereby, the information of the BCA recording position database 80 can be updated appropriately.

  The functions of the control unit 70, the disk information acquisition unit 71, the search unit 72, and the determination unit 73 in the disk device 1 are realized by a processing circuit. That is, the disk device 1 includes a processing circuit for executing each process described later with reference to FIG. The processing circuit is a CPU 7 that executes a program stored in the memory 8.

  The functions of the control unit 70, the disk information acquisition unit 71, the search unit 72, and the determination unit 73 are realized by software, firmware, or a combination of software and firmware. Software and firmware are described as programs and stored in the memory 8. The processing circuit reads out and executes the program stored in the memory 8, thereby realizing the function of each unit. That is, the disk device 1 includes a memory 8 that stores a program that, when executed by the processing circuit, results in each process of FIG. 4 being executed. In addition, these programs cause the computer to execute the procedures and methods of the control unit 70, the disc information acquisition unit 71, the search unit 72, and the determination unit 73.

  FIG. 3 is a diagram showing an outline of the recording area of the disk d. As shown in FIG. 3, the disk d has a data recording area in which normal recording tracks are formed, and a BCA is formed in the inner periphery of the data recording area. When reading information from the BCA, the optical pickup 2 is sent to the inner periphery of the data recording area to access the BCA.

BCA is a recording area whose radial width is narrower than that of the data recording area, and the beam spot of the optical pickup 2 is likely to come off due to the eccentricity of the disk d. In particular, the eccentricity of the disk d varies from disk to disk. For this reason, it is necessary to manage the movement control amount of the optical pickup 2 when information is successfully read from the BCA for each disk d.
Therefore, in the present invention, by using the BCA recording position database 80, BCA information can be appropriately read even if the disk d is changed.

Next, the operation will be described.
FIG. 4 is a flowchart showing the operation of the disk device 1 according to the first embodiment, and shows a series of processes for reading information from the BCA.
When the disk d is inserted into the disk device 1, the disk d is rotated by the spindle motor. The control unit 70 controls the servo unit 9 to drive the optical pickup 2 and reads data from the data recording area of the rotating disk d. This data is converted into a digital signal by the A / D converter 6 and then input to the disc information acquisition unit 71 and the determination unit 73. The disc information acquisition unit 71 reads the disc information of the disc d from the data input from the A / D converter 6 (step ST1).

The search unit 72 searches the movement control amount corresponding to the disc information acquired by the disc information acquisition unit 71 by referring to the BCA recording position database 80 (step ST2).
If the movement control amount corresponding to the BCA recording position database 80 is registered (step ST3; YES), the control unit 70 determines the optical pickup 2 based on the movement control amount of the optical pickup 2 searched by the search unit 72. Drive to access BCA. This causes the optical pickup 2 to read the BCA information of the disk d (step ST4).
As a result, the disc-specific identification information recorded in the BCA is immediately read, so that subsequent content playback can be started without delay.

On the other hand, when the movement control amount corresponding to the BCA recording position database 80 is not registered (step ST3; NO), the control unit 70 sends the optical pickup 2 to the inner periphery of the data recording area to access the BCA. Try (step ST5).
Thereafter, the determination unit 73 determines whether or not the information recorded in the BCA has been successfully read based on the information input from the A / D converter 6 (step ST6). For example, when the information input from the A / D converter 6 is sent to the content reproduction unit and the content is scrambled by this information, it is determined that the information has been successfully read from the BCA.

If it is determined that reading of information from the BCA has failed (step ST6; NO), the determination unit 73 notifies the control unit 70 of the determination result.
Upon receiving the failure notification from the determination unit 73, the control unit 70 returns to the process of step ST5, changes the inner peripheral feed amount of the optical pickup 2, and retries access to the BCA.

When it is determined that reading of information from the BCA is successful (step ST6; YES), the determination unit 73 notifies the control unit 70 of the determination result.
Upon receiving the success notification from the determination unit 73, the control unit 70 registers the movement control amount obtained by this access in the BCA recording position database 80 in association with the disc information of the disc d (step ST7). Thereafter, the process is terminated.

So far, the case where information whose disc information completely matches is read from the BCA recording position database 80 has been shown. However, the present invention is not limited to this.
For example, priorities may be given to each information included in the disc information, and the control movement amount corresponding to the information with higher priority may be read from the BCA recording position database 80.
The highest priority is given to the information indicating the most dominant manufacturer in the information recording in the BCA, and the next highest priority is given to the disc type considered to be the next dominant.
Thereby, the movement control amount of the optical pickup 2 that can appropriately read information from the BCA of the disk d can be specified based on the information dominant in the information recording in the BCA.
Even if there is no information indicating the manufacturer in the disc information, it is possible to specify the movement control amount of the optical pickup 2 using the next dominant information.

Further, the search unit 72 may be configured to search the BCA recording position database 80 for the control movement amount corresponding to the information specified by statistical analysis among the pieces of information included in the disc information.
For example, each piece of information included in the disc information is converted into 0, 1 dummy variables X ₁ , X ₂ ,..., X _n as category data, and a regression equation is obtained by multiple regression analysis for the feed amount of the optical pickup 2. Get Y. By using this regression equation Y, it is possible to specify the movement control amount of the optical pickup 2 that can appropriately read information from the BCA based on the disc information of the disc d newly inserted in the disc device 1. . If the information indicating the manufacturer of the disc d is dominant in the recording of information in BCA, it is expected that the weighting coefficients a _n corresponding to the variable X _n of the information indicating the manufacturer is increased.
The disc information used for generating the regression equation Y can be arbitrarily specified.
Thereby, the movement control amount of the optical pickup 2 that can read information from the BCA can be accurately specified.

As described above, the disk device 1 according to the first embodiment includes the control unit 70, the disk information acquisition unit 71, the search unit 72, and the BCA recording position database 80.
The disk information acquisition unit 71 acquires disk information for specifying the disk d.
In the BCA recording position database 80, the movement control amount of the optical pickup 2 that has succeeded in reading the BCA information of the disk d is stored in association with the disk information.
The search unit 72 searches the BCA recording position database 80 for a movement control amount corresponding to the disc information acquired by the disc information acquisition unit 71.
The control unit 70 causes the optical pickup 2 to read the BCA information of the disk d based on the movement control amount searched by the search unit 72.
Thus, since the movement control amount corresponding to the disc information is read from the BCA recording position database 80 and used for reading the BCA information, the BCA information can be appropriately read even if the disc d is changed.

Further, the disk device 1 according to the first embodiment includes a determination unit 73 that determines whether or not the reading of the BCA information of the disk d is successful. The control unit 70 stores, in the BCA recording position database 80, the movement control amount of the optical pickup 2 when it is determined by the determination unit 73 that reading is successful, in association with the disk information of the disk d.
With this configuration, the information in the BCA recording position database 80 can be updated appropriately.

  Further, in the disk device 1 according to the first embodiment, the disk information includes at least information indicating the manufacturer of the disk d. As a result, the amount of movement control of the optical pickup 2 that can appropriately read information from the BCA of the disk d can be specified using information that is most dominant for recording information in the BCA.

  Further, in the disk device 1 according to the first embodiment, the search unit 72 searches the BCA recording position database 80 for the control movement amount corresponding to the information with high priority among the pieces of information included in the disk information. With this configuration, it is possible to specify a movement control amount of the optical pickup 2 that can appropriately read information from the BCA using information with high priority. For example, a higher priority may be set for information indicating the manufacturer of the disk d.

  Further, in the disk device 1 according to the first embodiment, the search unit 72 uses the BCA recording position database 80 to calculate the control movement amount corresponding to the information specified by statistical analysis among the pieces of information included in the disk information. Search from. With this configuration, it is possible to accurately specify the movement control amount of the optical pickup 2 that can read information from the BCA.

  In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

  1 disk device, 2 optical pickup, 3 transport mechanism, 4 motor, 5 amplifier, 6 A / D converter, 7 CPU, 8 memory, 9 servo unit, 70 control unit, 71 disk information acquisition unit, 72 search unit, 73 Determination unit, 80 BCA recording position database.

Claims (5)

An acquisition unit for acquiring disk information for identifying a disk medium;
A database in which the movement control amount of the optical pickup that has succeeded in reading the information of the burst cutting area of the disk medium is stored in association with the disk information;
A search unit that searches the database for a movement control amount corresponding to the disk information acquired by the acquisition unit;
A disc apparatus comprising: a control unit that causes an optical pickup to read out information on a burst cutting area of a disc medium based on a movement control amount searched by the search unit. A determination unit for determining whether or not the information of the burst cutting area of the disk medium has been successfully read;
2. The control unit according to claim 1, wherein a movement control amount of the optical pickup when the determination unit determines that the reading is successful is stored in the database in association with disk information of a disk medium. Disk unit.   3. The disk device according to claim 1, wherein the disk information includes at least information indicating a manufacturer of the disk medium.   4. The search unit according to claim 1, wherein the search unit searches the database for a control movement amount corresponding to information having a high priority among the pieces of information included in the disc information. 5. 2. The disk device according to 1.   4. The search unit according to claim 1, wherein the search unit searches the database for a control movement amount corresponding to information specified by statistical analysis among pieces of information included in the disk information. The disk device according to any one of the above.

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