JP2013084326A - Optical disk device and adjusting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time until a recording start and to adjust focus balance with high reliability.SOLUTION: The optical disk device for reading/writing data in an optical disk medium includes a pickup for reading/writing data in the optical disk medium by a laser beam, and a control unit for controlling the operation of the optical disk device. The control unit determines whether data is yet to be recorded in the loaded optical disk medium, reads data from a predetermined logical block address of the optical disk medium when it is determined that data is yet to be recorded in the optical disk medium, and adjusts focus balance when the data is read from the predetermined logical block address.

Description

  The present invention relates to an optical disc apparatus, and more particularly to a technique for adjusting a focus balance when reading and writing information.

  In an optical disc apparatus that records information on an optical disc medium such as a CD, DVD, or BD, for example, focus balance adjustment has been a problem in the past. In a conventional optical disc apparatus, data recorded on the disc is read to adjust the focus balance.

  For unrecorded optical disc media, a method has been proposed in which focus balance adjustment data is recorded on a PCA (Power Calibration Area) before adjusting the focus balance, and the recorded management information is read to adjust the focus balance. (For example, refer to Patent Document 1).

JP 2010-55678 A

  As described above, since data for focus balance is recorded in a predetermined area (for example, PCA) in an unrecorded optical disc medium, recording power adjustment (OPC) for this recording must be performed. In fact, it took time for focus balance.

  In addition, when performing the focus balance a plurality of times, data is recorded in a predetermined area (for example, the PCA on the inner peripheral side or the outer peripheral side) every time the focus balance is executed, so that the recording area of the PCA is wasted. As a result, the PCA recording area may be insufficient later.

  On the other hand, Blu-ray Discs (particularly, BD-RE systems) are often sold with unrecorded disk media already in a logical format (UDF format) in order to improve user convenience. .

  An object of the present invention is to provide an optical disc apparatus capable of reducing the time required to start a write process even with an unrecorded disc.

  A typical example of the present invention is as follows. That is, an optical disk device that reads and writes data from and to an optical disk medium, and includes a pickup that reads and writes data to and from the optical disk medium by laser light, and a control unit that controls the operation of the optical disk device, and the control unit is mounted It is determined whether the optical disk medium is unrecorded. If it is determined that the optical disk medium is unrecorded, data is read from a predetermined logical block address of the optical disk medium, and data is read from the predetermined logical block address. When reading out, adjust the focus balance.

  According to the embodiment of the present invention, it is possible to shorten the time until the write process is started even on an unrecorded disc.

It is a block diagram which shows the structure of the optical disk apparatus of embodiment of this invention. 6 is a flowchart of recording power control and focus balance adjustment processing according to the embodiment of the present invention. 6 is a timing chart of recording power and focus balance adjustment processing according to the embodiment of the present invention. It is explanatory drawing which shows the format of the BD-R disc with which the optical disk apparatus of embodiment of this invention is mounted | worn. It is explanatory drawing which shows the format of the BD-RE disc with which the optical disk apparatus of embodiment of this invention is mounted | worn.

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

  An optical disk apparatus according to an embodiment of the present invention includes a disk motor 2, an optical pickup 3, a front monitor 4, a temperature sensor 5, a motor drive unit 6, an RF signal generation unit 7, a servo control unit 8, a laser power control unit 9, and a laser driver. 10, a decoder 11, a control unit 12, a memory 13 and an encoder 14.

  The disk motor 2 is driven by the motor driving unit 6 and rotates the optical disk medium 1. The motor drive unit 6 controls the rotation (for example, rotation, stop, rotation speed) of the motor according to an instruction from the control unit 12.

  The optical pickup 3 includes an actuator 31, an objective lens 32, a laser 33, a light receiving unit, a splitter, a front monitor 4, and a temperature sensor 5. The laser 33 is a light emitting unit including a semiconductor laser that generates laser light having a predetermined intensity for recording and reproduction. Laser light emitted from the laser 33 is applied to the recording surface (optical disc surface) of the optical disc medium 1 through the objective lens 32. The light receiving unit receives the laser light reflected by the recording surface of the optical disc medium 1 through the objective lens 32, converts the received reflected light into an electric signal, and outputs the converted electric signal. The objective lens 32 is driven by the actuator 31 and is adjusted so that the laser beam is focused on the optical disk surface. The actuator 31 is driven by the servo control unit 8.

  The laser beam generated by the laser 33 is separated by the splitter and guided to the front monitor 4. The front monitor 4 monitors the power of the laser light by the laser light separated by the splitter. The temperature sensor 5 detects the temperature of the optical pickup 3.

  The RF signal generation unit 7 performs analog processing (amplification, demodulation, etc.) of the signal from the optical pickup 3.

  The servo control unit 8 controls focus servo, tracking servo, and slide servo. That is, the focus servo controls the objective lens 32 by driving the actuator 31 so that the laser light is focused on the optical disk surface. The tracking servo controls the optical pickup 3 so as to follow the track of the optical disk medium 1. The slide servo controls the optical pickup to move to a predetermined position and keep the position.

  The laser power control unit 9 controls the output intensity of the laser light according to the laser output recorded in advance on the optical disc medium 1 or the laser output determined by OPC (Optimum Power Control). The laser driver 10 is a driver circuit that drives the laser 33. The laser power control unit 9 controls the laser driver 10.

  The decoder 11 outputs a signal from the optical pickup 3 as an RF signal, a tracking error signal, a focus error signal, and the like. The encoder 14 generates data to be written on the optical disc medium 1.

  The control unit (microcomputer) 12 controls the operation of the optical disc apparatus. For example, OPC processing for determining the intensity of laser light output from the laser 33, focus balance adjustment processing for determining the position of the objective lens 32 so that the laser light is focused on the optical disk surface, and laser light during recording operation The output control process. The memory 13 stores a program executed by the control unit 12 and data necessary for executing the program.

  The optical disk device is connected to a host computer via an interface (not shown).

  FIG. 2 is a flowchart of recording power and focus balance adjustment processing according to the embodiment of the present invention.

  First, when power is supplied to the optical disk apparatus, the optical disk apparatus is ready to accept commands from the host computer after initial settings such as various communication parameter settings, and transmits a ready command to the host computer.

  Thereafter, when the control unit 12 detects that the optical disk medium is loaded, it notifies the host computer that the optical disk medium is loaded.

  Before reading data from the optical disk medium, the host computer sends a command for reading file system information in order to know the data format of the loaded optical disk medium. This file system information is information necessary for the host computer to read data recorded on the optical disk medium, that is, information necessary to know the state of the data recorded on the optical disk medium. This is a read request command that is normally transmitted first after the host computer that has received the ready command.

  First, when an optical disk medium is loaded, the control unit 12 instructs the servo control unit 8 to move the optical pickup 3 to an initial position (for example, an end on the inner peripheral side), and then The laser 33 is turned on. Then, the management information recorded in the management area (for example, DMA) is read, and it is determined whether or not the loaded disc is an unrecorded disc (new disc) (S101). For example, since the final recording position is recorded in the DMA of the recorded disk, if the final recording position can be read from the DMA, it can be determined that the disk is a recorded disk. The determination can also be made based on data recorded in Control Data, PAC (see FIG. 4).

  As a result, when it is determined that the disc is a recorded disc, the focus balance is adjusted using already recorded data (S108). This focus balance adjustment can be performed by reading the data recorded in the data area, or by reading the data recorded in the predetermined area when executing the previous focus balance. It is also possible to read out the management information recorded in. Thereafter, the process proceeds to step S109, and recording power adjustment (OPC) is performed.

  For adjusting the focus balance using the recorded data, for example, the actuator is operated, the data (or RF) is read while changing the focal length of the objective lens, and the optimum reading condition is set as the focus balance. For example, the lens position where the maximum value of the output tracking signal is obtained is set to the optimum focus balance for this optical disc. Further, the focus balance may be set using an optimum value of jitter (or other parameters such as modulation) of the read data.

  On the other hand, if it is determined that the disc is an unrecorded disc, it is determined whether or not file system information is recorded (S102). For example, the determination can be made based on whether specific data is recorded in a specific area. That is, since an area to be recorded on the optical disk medium is always determined when the UDF is formatted, whether the optical disk medium has been recorded can be determined based on whether data is recorded in this area. Specifically, file system information is recorded on the inner periphery side of the optical disk medium (for example, logical block addresses 0x10 to 0x100) in the optical disk medium formatted by UDF.

  As a result, when it is determined that the disc is an unrecorded disc on which file system information is recorded, the file system information is read to adjust the focus balance (S103). A specific method for adjusting the focus balance is the same as the method described in step S108. Thereafter, the process proceeds to step S109, and recording power adjustment (OPC) is performed.

  Instead of the file system information, other information recorded by executing the UDF format (for example, information recorded in Pre Write Area, Control Data, DMA, etc.) may be used. Further, an RF signal obtained by reading other information (for example, a signal of a predetermined pattern) recorded on the UDF formatted optical disc medium may be used. Furthermore, if the data is recorded, the focus balance can be adjusted based on an index of data read quality (for example, PI Error, SER, Jitter, etc.), and more stable focus balance adjustment is possible. it can.

  On the other hand, when it is determined that the disc is an unrecorded disc in which file system information is not recorded, the recording power is temporarily adjusted (Pre OPC) using the inner or outer PCA (Power Calibration Area) (S104). . Specifically, the recording surface of the optical disc medium 1 is irradiated with laser light whose recording power (laser output) has been changed, and predetermined data (recording marks) is recorded on the final recording position of the PCA of the optical disc medium 1 (next OPC For the data to be written). Note that a value adjusted at the time of manufacturing the optical disc apparatus (or a default value specified by firmware) may be used for setting the focus balance during temporary OPC. Then, by reading the recorded data and measuring the β value, jitter, error rate, etc. of the read data, an appropriate recording power of the laser beam is temporarily set. The OPC in step S104 is a temporary adjustment of the laser power for adjusting the focus balance in step S106.

  Thereafter, the data is recorded at the final recording position of the PCA with the recording power temporarily set in step S104 (S105). Since this data is to be read when the focus balance is adjusted in step S104, arbitrary data, for example, continuous “0” data may be used. Note that when the OPC data is recorded in the PCA, the focus balance is not adjusted, so the data may be written with the center value of the focus balance.

  Thereafter, the focus balance is adjusted using the data written in step S104 (S106). A specific method for adjusting the focus balance is the same as the method described in step S108.

  After that, information such as an address where data for adjusting the focus balance is written (or can be written) is stored in the memory. These pieces of information can be left on the Disc by using a reserved area of the Disc management information, and data can be added when updating the Disc management information. In step S107, the information is actually stored on the Disc. There is no need to record.

  Thereafter, recording power adjustment (OPC) is performed using the set focus balance (S109).

  In FIG. 2, the processing for adjusting the recording power and the focus balance is described as being executed when a command for reading file system information is transmitted from the host computer. It may be executed when a start request is received.

  For example, the optical disk device reads file system information to determine during setup whether the mounted optical disk medium has been formatted. If the file system information is recorded, it is determined that the UDF format has been completed, and the above-described processing for adjusting the recording power and the focus balance is executed.

  Further, as described above, it is determined whether the UDF format has been completed during the setup, and when the recording start request is received, the above-described processing for adjusting the recording power and the focus balance is executed.

  FIG. 3 is a timing chart of processing for adjusting the recording power and the focus balance according to the embodiment of the present invention.

  According to this timing chart, a conventional process for adjusting the recording power and focus balance (FIG. 3A) on an unrecorded disc, and a process for adjusting the recording power and focus balance according to the present invention (FIG. 3B). The differences will be described.

  As shown in FIG. 3A, in the conventional method, when an optical disk medium is loaded, information recorded in the file system is read to determine whether the loaded unrecorded disk is UDF formatted or not. (S102). For example, it is possible to determine whether the disc is a UDF formatted disc based on whether specific data is recorded in a predetermined logical block address (for example, logical address 0x10 to 0x100) of the optical disc medium.

  If it is determined that data has not been written even in the optical disk medium in the UDF format, for example, temporary adjustment of recording power (Pre OPC) is performed using the inner peripheral PCA (S104). Thereafter, data is recorded at the final recording position of the PCA with the temporarily adjusted recording power to create an adjustment area (S105). Then, the focus balance is adjusted using the data written in the adjustment area (S106), and the recording power is adjusted (OPC) using the adjusted focus balance (S109).

  Thereafter, the data requested from the host computer is written to the optical disk medium.

  On the other hand, in the method of the embodiment of the present invention, as shown in FIG. 3B, when an optical disk medium is loaded, information recorded in the file system is read and the loaded disk is an UDF formatted optical disk. It is determined whether or not it is a medium (S102).

  If it is determined that the optical disk medium is UDF formatted and data is not written, the file system information is read to adjust the focus balance (S103), and the adjusted focus balance is used to adjust the recording power. Adjustment (OPC) is performed (S109).

  Thereafter, the data requested from the host computer is written to the optical disk medium.

  FIG. 4 is an explanatory diagram showing a format of a BD-R disc mounted on the optical disc apparatus according to the embodiment of the present invention.

  The BD-R disc is provided with a lead-in area 51, a data recording area 52, and a lead-out area 53 from the inner periphery.

  The file system data 54 is recorded on the inner circumference side of the data recording area 52 (for example, logical block addresses 0x10 to 0x100). As described above, file system data is recorded on an optical disc medium that has been UDF formatted.

  In addition, in the BD-R disc that has been logically formatted, data is recorded in the Pre Write Area 55 in the lead-in area 51.

  For this reason, when the optical disc loaded in the optical disc apparatus is a BD-R disc, in step S102, the management information on the inner peripheral side (for example, data of Pre Write Area 55) or the outer peripheral side is read, and the read data is used. The focus balance may be adjusted (S103).

  FIG. 5 is an explanatory diagram showing a format of a BD-RE disc mounted on the optical disc apparatus according to the embodiment of the present invention.

  The BD-RE disc is provided with a lead-in area 51, a data recording area 52, and a lead-out area 53 from the inner periphery.

  The file system data 54 is recorded on the inner circumference side of the data recording area 52 (for example, logical block addresses 0x10 to 0x100). As described above, in the UDF formatted optical disk medium, the file system specification of the optical disk medium is determined, and file system data is recorded.

  In addition, in a logically formatted BD-RE disc, the control data areas 56 and 57 in the lead-in area 51, the PAC areas 60 and 61, the DMA areas 62 and 63, and the control data areas 58 and 59 in the lead-out area 53 are displayed. Data is recorded in the DMA areas 64 and 65.

  For this reason, after the optical disk medium is loaded in the optical disk apparatus, if the loaded optical disk is a BD-RE disk, data in any of the Control Data area, PAC area, and DMA area is read in step S102. The focus balance may be adjusted in this area (S103).

  The embodiment of the present invention has been described with respect to the example in which the focus balance is set using the file system information. However, the tilt adjustment may be performed using the read file system information.

  As described above, according to the embodiment of the present invention, since the focus balance is adjusted using file system information in an unrecorded disc, the focus balance can be adjusted without wasting the recording area of the PCA. . In addition, the focus balance can be adjusted with high reliability. This is because the file system information is an area that is always requested to be read from the host computer. Therefore, in response to the read request of the file system information from the host computer, the data (file system information) of a specific logical block address is stored. This is because it is efficient to use and adjust the focus balance.

  In addition, since it is not necessary to search for an unrecorded area in which data for focus balance is written and to write data for focus balance, the time required to start the write process can be shortened.

  Furthermore, the file system information includes information on the format of data recorded on the optical disk medium. If the file system information cannot be read, the data recorded on the optical disk medium cannot be read correctly. For this reason, the focus balance can be adjusted with high reliability by adjusting the focus balance using the file system information. In other words, the optical disk apparatus can be set to a condition that allows the file system information to be read reliably as compared to adjusting the focus balance using other management information of the optical disk medium.

DESCRIPTION OF SYMBOLS 1 Optical disk 3 Optical pick-up 31 Actuator 32 Objective lens 33 Laser 9 Laser power control part 10 Laser driver 12 Control part

Claims (15)

An optical disk device for reading / writing data from / to an optical disk medium,
A pickup that reads / writes data from / to an optical disk medium with laser light, and a control unit that controls the operation of the optical disk device,
The controller is
Determine whether the mounted optical disk medium is unrecorded,
When it is determined that the optical disk medium is unrecorded, data is read from a predetermined logical block address of the optical disk medium,
An optical disc apparatus for adjusting a focus balance when reading data from the predetermined logical block address. The optical disk device is connected to the host computer,
The data reading from the predetermined logical block address is a reading of data for the host computer to know the state of data recorded on an optical disk medium mounted on the optical disk device. 1. An optical disc device according to 1. The optical disk device is connected to the host computer,
Reading of data from the predetermined logical block address is performed by an initial read request after the initial setting of the optical disk device is completed and a request from the host computer can be accepted. The optical disc apparatus according to claim 1.   The optical disk apparatus according to claim 1, wherein the optical disk apparatus reads data from a predetermined logical block address of the optical disk medium in the middle of initial setting after power is turned on.   5. The optical disc apparatus according to claim 1, wherein reading of data from the predetermined logical block address is information of a file system set in the optical disc medium. An adjustment method of an optical disk device for reading and writing data on an optical disk medium,
The optical disc device includes a pickup that reads and writes data from and to an optical disc medium by laser light, and a control unit that controls the operation of the optical disc device,
The method
The control unit determines whether the mounted optical disk medium is unrecorded;
When the control unit determines that the optical disk medium is unrecorded, it reads data from a predetermined logical block address of the optical disk medium,
An adjustment method of an optical disc apparatus, wherein the control unit adjusts a focus balance when reading data from the predetermined logical block address. The optical disk device is connected to the host computer,
The data reading from the predetermined logical block address is a reading of data for the host computer to know the state of data recorded on an optical disk medium mounted on the optical disk device. 6. An adjustment method for an optical disc apparatus according to item 6. The optical disk device is connected to the host computer,
Reading of data from the predetermined logical block address is performed by an initial read request after the initial setting of the optical disk device is completed and a request from the host computer can be accepted. The method of adjusting an optical disk device according to claim 6.   The optical disk apparatus adjustment method according to claim 6, wherein the control unit reads data from a predetermined logical block address of the optical disk medium in the middle of initial setting after power is turned on.   10. The method of adjusting an optical disk device according to claim 6, wherein reading of data from the predetermined logical block address is information on a file system set in the optical disk medium. . An optical disk device for reading / writing data from / to an optical disk medium,
A pickup that reads / writes data from / to an optical disk medium with laser light, and a control unit that controls the operation of the optical disk device,
The controller is
Determine whether the mounted optical disk medium is unrecorded,
When it is determined that the optical disk medium is unrecorded, data is read from a predetermined logical block address of the optical disk medium,
An optical disc apparatus for adjusting a tilt of the optical disc medium when reading data from the predetermined logical block address. The optical disk device is connected to the host computer,
The data reading from the predetermined logical block address is a reading of data for the host computer to know the state of data recorded on an optical disk medium mounted on the optical disk device. 11. An optical disc device according to item 11. The optical disk device is connected to the host computer,
Reading of data from the predetermined logical block address is performed by an initial read request after the initial setting of the optical disk device is completed and a request from the host computer can be accepted. The optical disc apparatus according to claim 11.   12. The optical disk apparatus according to claim 11, wherein the optical disk apparatus reads data from a predetermined logical block address of the optical disk medium in the middle of initial setting after power is turned on.   15. The optical disk apparatus according to claim 11, wherein reading of data from the predetermined logical block address is information of a file system set in the optical disk medium.

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