JP2005302086A - Device and method for recording to optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute data recording with high reliability by selecting exact recording conditions to an optical disk, even when an unknown optical disk or an optical disk with lot variation is inserted. <P>SOLUTION: An area of OPC, a physical layer management area for managing information about a physical layer such as OPC information, a Control Data Zone and a user area are respectively provided from inner peripheral side of the optical disk. An area of a file system for managing logical layer information of a file or the like recorded in the user area exists at the head of the user area and in the subsequent area, an area α in which an OPC management file A for managing the OPC information in the user area is recorded, areas β, γ, δ for executing the OPC in the user area are provided at the head of the user area. Thus, the OPC is executed in a middle peripheral region of the optical disk by using a file B for executing OPC in the user area and a file A for managing the executed OPC. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc recording apparatus and recording method, and more specifically, to an optical disc recording apparatus having a function of recording data on an overwritable optical disc, and a data recording method on an optical disc using the optical disc recording apparatus. .

  Phase-change optical discs such as CD-RW and DVD-RW that can be repeatedly recorded use a recording material that reversibly changes phase between an amorphous state and a crystalline state as a recording layer, and between these two states. Digital data is recorded and reproduced using the fact that the refractive index is different.

  Digital data is recorded on the phase change optical disk as described above by irradiating the recording layer of the optical disk with laser light, heating a minute area of the recording layer, and forming a mark corresponding to the digital data on the recording layer. Executed. The recording layer on which this mark is formed is normally in an amorphous state, and the space between the marks is in a crystalline state. Transition between these states is controlled by the power of the laser beam to be irradiated and the irradiation time.

  Naturally, there are optimum values for the power magnitude and time parameters that characterize the pulses of the laser light, and the operation for searching for the optimum conditions is read as Optimum Power Control (OPC). Prior to recording on the phase change optical disc, OPC is performed to determine the optimum condition of the laser light pulse, and data is recorded using that value.

FIG. 5 is a diagram showing an example of the data configuration of a conventional optical disc, in which the disc data configuration up to the outermost circumference is depicted as a schematic diagram on a straight line with the inner circumference side of the optical disc on the left side.
The data structure of the optical disk is provided with an OPC area of the physical layer, a physical layer management area for managing physical layer information such as OPC information, and a control data zone from the inner circumference side of the disk, and a user area on the outer circumference side. Is provided.

  Here, the OPC area where OPC is performed is provided outside the user area on the inner periphery side of the optical disc. A file system that manages logical layer information such as a file recorded in the user area exists at the head of the user area.

  When data is recorded in the user area, the optimum recording conditions are obtained by performing OPC prior to the recording. At this time, as can be seen from FIG. 5, the OPC area where the OPC is performed is provided on the innermost circumference of the optical disc, whereas the user area extends from the outside of the OPC area to the outermost circumference of the optical disc. For this reason, the optimum value obtained from the OPC performed in the innermost OPC area cannot cope with the change in the optimum recording condition in the optical disc radial direction.

  FIG. 6 is a diagram showing an example of the optimum recording power of the disc. 2. Description of the Related Art In an optical disk recording apparatus that records information on an optical disk, a constant linear velocity recording method (Constant Linear Velocity: CLV method) in which information is recorded and read at a constant linear velocity is usually employed. In this CLV method, since the relative speed between the optical disk and the laser beam is always constant, if the optimum power is determined by performing OPC at the innermost circumference of the optical disk, recording is performed using the same power over the entire circumference of the optical disk. There seems to be no problem.

  However, in practice, as shown in FIG. 6, the actual optimum recording power varies depending on the position in the optical disk radial direction. The reason for this is that the thickness of the recording layer of the optical disc becomes relatively thinner toward the outer periphery of the optical disc. When the film thickness of the recording layer is reduced, the temperature of the recording layer is increased with a relatively small recording power, so that the optimum recording power is smaller than that of a relatively thick film.

As a method for compensating for the variation in the optimum recording power in the radial direction of the optical disc as shown in FIG. 6, there is the following method.
For example, the variation in the radial direction of the optimum recording condition on the optical disc is measured in advance before shipment of the optical disc recording device (writer), and the measurement result is stored in the nonvolatile memory of the writer. There is a method in which an appropriate recording condition can be selected by using the result of OPC and the variation information in the radial direction stored in the memory.

  However, in the above method, when there is a variation between lots in the production of the optical disk, that is, when the tendency and degree of the radial variation of the optimum recording conditions are different for each lot of the optical disks, Recording will not be possible. In addition, this method can be applied to optical discs in which the fluctuation data measured in advance before shipment of the writer is stored in the nonvolatile memory. However, there arises a problem that the optical disk that has different characteristics, that is, an optical disk that is unknown to the writer, cannot be handled at all.

  For example, Patent Document 1 describes additional information other than trial writing, for example, additional information for identifying a recording medium, in a PCA (Power Calibration Area) for performing trial writing by OPC. There has been disclosed a technology that makes it possible to identify a recording medium that has been illegally copied, and to prevent a decrease in writing characteristics and jitter characteristics that occur when writing to such a recording medium.

However, in the above-mentioned Patent Document 1, when there is variation among lots in the production of an optical disc as described above, that is, the tendency and degree of variation in the radial direction of the optimum recording conditions differ for each lot of optical discs. There is no disclosure about the idea of enabling recording under proper recording conditions in some cases.
JP 2001-351241 A

  As described above, the optical disk recording device (writer) has a problem that an optimum recording condition cannot be set when the lot of the optical disk changes or when an unknown optical disk is inserted into the optical disk recording device.

  The present invention has been made in view of the above circumstances, and even when an unknown optical disk or an optical disk with lot fluctuation is inserted, an accurate recording condition is selected for the optical disk, and highly reliable data recording is performed. It is an object of the present invention to provide an optical disc recording apparatus and an optical disc recording method that can execute the above.

  The first technical means is an optical disk recording apparatus that records data by irradiating a laser pulse on an optical disk, and the optical disk recording apparatus sets an operation for obtaining an optimum condition for irradiation of a laser pulse to a user area. It is characterized by performing using.

  The second technical means is characterized in that, in the first technical means, information for managing an operation for obtaining an optimum condition related to laser pulse irradiation is recorded in a file system which is management information held on an optical disc. Is.

  According to a third technical means, in the second technical means, a plurality of areas for performing an operation for obtaining an optimum condition for laser pulse irradiation are set on the optical disk, and information for managing the plurality of areas is stored on the optical disk. It is recorded in a file system that is management information that is held.

  A fourth technical means is an optical disk recording method for recording data by irradiating an optical disk with a laser pulse, and performs an operation for obtaining an optimum condition regarding irradiation of the laser pulse using a user area set on the optical disk. It is characterized by that.

  The fifth technical means is characterized in that, in the fourth technical means, information for managing an operation for obtaining an optimum condition related to laser pulse irradiation is recorded in a file system which is management information held on an optical disc. Is.

  A sixth technical means sets, in the fifth technical means, a plurality of areas on the optical disk for performing an operation for obtaining an optimum condition for laser pulse irradiation, and information for managing the plurality of areas is stored on the optical disk. It is recorded in a file system that is management information that is held.

  According to the present invention, even when an unknown disk or a disk in which lot fluctuation has occurred is inserted into the optical disk recording apparatus, the recording condition on the optical disk is changed according to the change in the optimum recording condition at the radial position of the optical disk. By doing so, it becomes possible to record highly reliable data, thereby greatly improving the reliability of the recorded data and the reliability of the system and improving the recording compatibility of the optical disk.

FIG. 1 is a block diagram for explaining an example of an optical disk recording apparatus to which the present invention is applicable. The optical disk recording apparatus 10 includes an optical pickup 11 for irradiating the optical disk 1 with a laser, a servo control unit 12 that performs servo control necessary for the optical pickup such as a focus servo and a tracking servo of the optical pickup 11, and an optical disk recording apparatus. An ID reading unit 13 that reads ten disk IDs, a recording control unit 14 that controls data recording on the optical disc, and a controller 15 that controls the entire apparatus.
The optical disk recording apparatus 10 is connected to a host device such as the host computer 20 and the controller 15 performs a control operation according to a command from the host device.

  FIG. 2 is a diagram showing an example of the data configuration of an optical disc created according to the present invention, in which the disc data configuration up to the outermost circumference is depicted as a schematic diagram on a straight line with the inner circumference side of the optical disc on the left. The optical disc is provided with an OPC area of the physical layer, a physical layer management area for managing physical layer information such as OPC information, and a control data zone from the inner circumference side, and further provided with a user area on the outer circumference side. It has been. At the top of the user area is a file system area where a file system that manages logical layer information such as files recorded in the user area is held, and behind that, manages OPC information in the user area An area α in which the OPC management file A to be recorded is recorded, and areas β, γ, and δ for executing OPC in the user area are provided. The file system consists of management information held by the optical disk. For example, information that defines the method for creating, moving, and deleting files and folders, the method for recording data, the location of the management area, and the usage method It is included.

  The area β is provided for 700 ECC blocks from a position 24.3 mm in the radial direction of the disk from the inner circumference of the disk, and the area γ is provided for 700 ECC blocks from a position of 41.1 mm in the radial direction of the disk from the inner circumference of the disk. The area δ is provided for 700 ECC blocks from a position of 57.9 mm in the disk radial direction from the inner periphery of the disk. An ECC block is a unit in which 16 sectors as information units on a track are gathered, and error correction is performed in units of ECC blocks.

  Since the file system and the OPC areas α, β, and γ are provided in the user area of the optical disc, information created by the user is recorded using an empty area other than the above. Become. Regions β, γ, and δ are defined as elements constituting the OPC file B. Specifically, the hierarchy of the file system is as shown in FIG.

  As shown in FIG. 3, an OPC directory in the user area is defined under the Root directory, and an OPC information management file A in the user area and an area file B for executing OPC in the user area are included therein. Is defined. The start address and length (number of bytes) of file A are described in File Entry of file A. The contents of FileA are shown in Table 1 below.

  That is, the start position of the area α in FIG. 2 is LSN (logical address) 300h, and its length is 8000h bytes (16 sectors = 1 ECC block). Here, h means that the number is described in hexadecimal.

  Next, the start addresses and lengths of the areas β, γ, and δ constituting the file B for OPC execution are described in the FileEntry of the file B. The contents of FileB are shown in the following table.

  That is, the radius position 24.3 mm of the region β in FIG. 2 corresponds to LSN = 3450h, and the length of the 700 ECC block corresponds to 15E0000h bytes. Similarly, for the region γ, the radius position 41.1 mm of the region γ corresponds to LSN = E1700h, and the length of the 700 ECC block corresponds to 15E0000h bytes. For the region δ, the radial position 57.9 mm of the region δ corresponds to LSN = 22F000h, and the length of the 700 ECC block corresponds to 15E0000h bytes.

Next, the contents of the OPC information management file A in the user area will be described.
The file A has one ECC block, that is, 16 sectors, but one sector manages one OPC execution area. That is, when there are three OPC execution areas of β, γ, and δ as in the present embodiment, three sectors of the file A are used. Table 3 below shows the definition of 2048 bytes constituting one sector.

  Here, an address on the application layer described in BP9-12 will be described. FIG. 4 is a diagram for explaining the concept of the regions β, γ, and δ on the application layer. The areas β, γ, and δ that exist separately on the disc are interpreted as being continuous on the application layer, and addresses are assigned in order from those existing on the inner periphery side of the optical disc. That is, the start address of the region β is 0. Since each area has 700 ECC blocks (= 2BC0h sectors), the head of the area γ is 2BC0h, and similarly, the head address of the area δ is 5780h.

  Since the OPC is performed in order from the outer periphery side of the disk, the addresses on the application layer at the head of the ECC block that can be used for the OPC first are 2BB0h, 5770h, and 8330h in order. Table 4 below shows values described in each sector in a state before the first OPC in the user area.

When the OPC is performed, the “address on the application layer at the head of the ECC block that can be used next” described in the BP 9-12 changes.
Information for area β management is described in sector 0, information for area γ management is described in sector 1, and information for area δ management is described in sector 2. Since there are three OPC execution areas, sector 3-15 becomes invalid and 00h is described in BP0 of sector 3-15. If the number of areas is increased, sectors 3 and later are used, and the format is such that a maximum of 16 areas can be defined as user areas.

  By using the OPC execution file B in the user area and the file A for managing the performed OPC information in this way, it becomes possible to perform OPC in the inner and outer peripheral areas of the optical disc. In other words, since OPC can be executed in the vicinity of actually recording user data, even if an unknown disk or a disk with lot fluctuation is inserted, even if there is a fluctuation in the optimum recording condition at the radial position of the disk. The optimum recording conditions can be determined in accordance with the fluctuations, so that highly reliable data can be recorded.

  In accordance with the gist of the present invention, the present invention is not limited to the optical disk format described in the embodiments, and it is obvious that the present invention can be applied to various formats.

It is a block diagram for demonstrating an example of the optical disk recording device which can apply this invention. It is a figure which shows an example of the data structure of the optical disk produced by this invention. It is a figure showing the hierarchy described in the file system applied to this invention. It is a figure for demonstrating the concept of the area | region which performs OPC on an application layer. It is a figure which shows an example of the data structure in the conventional optical disk. It is a figure which shows an example of the optimal recording power of a disc.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 10 ... Optical disk recording device, 11 ... Optical pick-up, 12 ... Servo control part, 13 ... ID reading part, 14 ... Recording control part, 15 ... Controller, 20 ... Host computer.

Claims (6)

  An optical disc recording apparatus that records data by irradiating an optical disc with a laser pulse, and the optical disc recording apparatus executes an operation for obtaining an optimum condition regarding the irradiation of a laser pulse by using a user area set on the optical disc. An optical disk recording apparatus characterized by the above.   2. The optical disk recording apparatus according to claim 1, wherein information for managing an operation for obtaining an optimum condition related to the irradiation of the laser pulse is recorded in a file system which is management information held on the optical disk. apparatus.   3. The optical disk recording apparatus according to claim 2, wherein a plurality of areas for performing an operation for obtaining an optimum condition regarding the irradiation of the laser pulse are set on the optical disk, and information for managing the plurality of areas is stored on the optical disk. An optical disk recording apparatus for recording in a file system which is management information held.   An optical disc recording method for recording data by irradiating a laser pulse on an optical disc, wherein an operation for obtaining an optimum condition relating to the irradiation of a laser pulse is executed using a user area set in the optical disc. Recording method.   5. The optical disc recording method according to claim 4, wherein information for managing an operation for obtaining an optimum condition related to the irradiation of the laser pulse is recorded in a file system which is management information held on the optical disc. Method.   6. The optical disk recording method according to claim 5, wherein a plurality of areas for performing an operation for obtaining an optimum condition relating to the irradiation of the laser pulse are set on the optical disk, and information for managing the plurality of areas is stored on the optical disk. An optical disk recording method comprising: recording in a file system which is management information held.

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