JP2004310801A - Optical disk device, and control method for optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of relieving processing burden, and realizing a high speed access operation, and to provide its control method. <P>SOLUTION: The optical disk device, in which access is controlled for an optical disk having first address information given for every first recording region of the prescribed recording density using second address information given for every second recording region in which the first recording region is sectioned logically, thereby increasing a recording density for the first recording region and recording data, comprises: a second address information deciding means deciding second address information given to the second recording region for the second recording region being a first irradiation position of a laser beam irradiating; and a second address information generating means generating second address information given to the second recording region accessed from the first irradiation position to a second irradiation position based on the second address information while the irradiation position of the laser beam is moved from the first irradiation position to the second recording region being the prescribed second irradiation position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device that performs recording or reproduction on an optical disk and a control method thereof.
[0002]
[Prior art]
As one of the standards of an optical disk capable of recording and reproducing information using a laser beam, a CD (Compact Disk) such as a data write-once type (Write Once) CD-R and a rewritable type (ReWritable) CD-RW. ) There is a standard. In recent years, the diffusion rate of CD-R and CD-RW discs has been expanding along with the price reduction, and they have been widely used.
[0003]
In an optical disk (CD standard medium) conforming to the physical format of the CD standard capable of recording / reproducing, a pre-groove (guide groove) forming a track is wobbled in accordance with a waveform FM-modulated based on absolute time information or the like. Meandering). By demodulating the wobbling frequency from this pregroove, an absolute time in pregroove (ATIP) address, which is absolute time information, can be obtained. The ATIP address is used as information for managing a recording / reproducing position of data on the CD standard medium in an optical disc apparatus that records / reproduces data using a logical format of the CD standard.
[0004]
By the way, the recording capacity of CD-R and CD-RW discs is about 650 Mbytes or 700 Mbytes as standard. In recent years, there has been a high demand for an optical disc medium to have a larger capacity for video recording and the like, and the standard recording capacities of CD-R and CD-RW discs cannot meet such needs.
[0005]
For this reason, the optical disk device converts (decodes) an ATIP address acquired from an existing CD standard medium such as a CD-R and a CD-RW into an address for high-density recording. Then, a mechanism for realizing high-density recording on the CD standard medium by using the decoded high-density recording address has been proposed (for example, see Patent Document 1 shown below).
[0006]
It should be noted that the high-density recording address is an address assigned to each divided area when a recording area corresponding to two adjacent ATIP address sections is logically divided by a predetermined number (magnification of recording density). And is associated with an ATIP address.
[0007]
When an optical disk device having the above-described mechanism (hereinafter, referred to as a conventional optical disk device) performs high-density recording on a CD-standard medium using a high-density recording address, the above-described partitioned area to be recorded with data is used. On the other hand, ID (Identification Data) information associated with the high-density recording address is recorded together with the actual data. The purpose of this is to provide a conventional optical disk device that optically reads the above-mentioned ID information from a CD standard medium, and decodes the ID information based on the read ID information, using a high-density recording address to record the position of the segmented area. It is for identifying.
[0008]
FIG. 7 is a block diagram for explaining a configuration of an address decoder unit provided in a conventional optical disk device. As shown in FIG. 1, in the conventional optical disk apparatus, an ATIP decoder 5 for decoding an ATIP address from wobbling information of a pregroove formed on a CD standard medium, and an ATIP address decoded by the ATIP decoder 5 or a CD standard A PSN (Physical Sector Number) address as a high-density recording address based on ID information optically read from the medium; and a PSN decoder 18 for decoding the PSN address. The system control microcomputer 12 is a control circuit for controlling the overall control of the optical disk device with respect to recording and reproduction of data on a CD standard medium.
[0009]
Here, the conventional optical disc apparatus uses a current irradiation position (“first irradiation position”) of the laser beam irradiated on the optical disc during a seek operation or data recording / reproducing processing. "Second irradiation position"). In this movement, the optical head for emitting the laser beam is moved in a direction along the track by a predetermined moving amount unit (for example, in the case of a seek operation), or the target track is moved by rotating the optical disk. (For example, in the case of sequential access).
[0010]
The above-described ATIP decoder 5 and PSN decoder 18 decode the ATIP address and the PSN address of the current irradiation position of the laser light every time the irradiation position of the laser light straddles the section area. Then, by referring to the decoded ATIP address and PSN address, it is determined whether or not the laser beam has reached a target irradiation position.
[0011]
[Patent Document 1]
JP-A-2002-56617
[0012]
[Problems to be solved by the invention]
An optical disk device generally has a time (access time) from when a recording / reproduction request is received from an information processing device such as a personal computer to when data recording / reproduction is actually performed on an optical disk. It is said to be longer than other peripheral storage devices. Therefore, in the above-described conventional optical disk device, it is an important issue to shorten the access time, that is, to realize high-speed access.
[0013]
However, the above-described decoding processing of the ATIP address and the PSN address is performed every time the optical disk device receives a recording / reproducing request from an information processing device such as a personal computer. Further, even in the case of an access in response to a single recording / reproduction request from the information processing apparatus described above, when the movement of the laser light is an access that extends over a plurality of the divided areas, the irradiation position of the laser light is The decoding process of the ATIP address and the PSN address is performed every time the image data passes over the divided area.
[0014]
In particular, when the moving section of the irradiation position of the laser beam is long, the number of decoding processes is significantly increased. Further, with the increase in the number of decoding processes, optical reading of the wobbling information and ID information of the CD standard medium is performed many times via an optical head or the like. In the conventional optical disk device, the increase in the number of decoding processes described above causes an increase in processing load and a factor that makes it difficult to realize high-speed access.
[0015]
Here, an object of the present invention is to solve the above-described problem, and an object of the present invention is to provide an optical disk device that reduces processing load and realizes high-speed access, and a control method thereof.
[0016]
[Means for Solving the Problems]
A main aspect of the present invention for solving the above-mentioned problem is that the first recording area is logically mapped to an optical disc having first address information assigned to each first recording area of a predetermined recording density. The access is controlled using the second address information assigned to each of the second recording areas, which is divided into groups, and the recording density of the first recording area is increased by increasing the recording density from the predetermined recording density. In an optical disc device capable of performing recording, the second address assigned to the second recording area for the second recording area to be the first irradiation position of the laser light applied to the optical disc Second address information determining means for determining information; and determining the laser light irradiation position while moving the laser light irradiation position from the first irradiation position to the second recording area to be a predetermined second irradiation position. Was done And generating the second address information given to the second recording area accessed from the first irradiation position to the second irradiation position based on the second address information. Address information generating means.
[0017]
The above-mentioned “first address information” is, for example, an “ATIP address” to be described later, and the above-mentioned “second address information” is, for example, a “PSN address” or “ID information” to be described later. That is.
The above-mentioned “second recording area obtained by logically dividing the first recording area” corresponds to one ATIP section to be described later according to a logical format adopted by the optical disc apparatus according to the present invention in a high-density recording mode. It indicates a second recording area obtained by dividing the first recording area into a predetermined number (magnification of recording density).
The above-mentioned “second address information determining unit” is, for example, an “ATIP-PSN conversion unit” described later, and the above-mentioned “second address information generating unit” is, for example, an “address-PSN converting unit” described later. Update unit ”.
The above-mentioned “access” refers to, for example, recording or reproducing data on an optical disc during a seek operation or a sequential access described later. For example, in the case of a seek operation, this corresponds to optical reading (reproduction) of wobbling information from an optical disc. In the case of sequential access (including tracing), it corresponds to recording or reproduction of actual data on an optical disk in addition to the above-mentioned optical reading (reproduction) of wobbling information.
The above-mentioned “first irradiation position” is, for example, a “seek start position” or “(sequential) access start position” which will be described later, and the above-mentioned “second irradiation position” is, for example, described later. "Seek target position" and "access end position".
[0018]
In this manner, the optical disk device according to the present invention performs access control using the second address information and can perform high-density recording as compared with a conventional optical disk device (hereinafter, referred to as a conventional optical disk device). This eliminates the need to optically read the ID information of the optical disc in the state of high-density recording and to perform the process of generating (decoding) the second address information from the read ID information.
This can reduce the processing load of the optical disk device according to the present invention and realize high-speed access. Further, since there is no need to provide a PSN decoder, which will be described later, provided in the conventional optical disk device, it is possible to realize a reduction in size, power consumption, cost, and the like.
[0019]
As a second aspect according to the present invention, the optical disc has the first address information in association with the wobbling information of a track, and the optical disc apparatus irradiates the first irradiation position. A first address information generating unit configured to receive the wobbling information read from the optical disk based on the reflected light of the laser beam and generate the first address information associated with the received wobbling information; The second address information deciding means converts the second address information associated with the first address information based on the first address information generated by the first address information generating means. I will decide. The above-mentioned "first address information generating means" is, for example, an "ATIP decoder" described later.
[0020]
As described above, the second address information determining means determines the second address information for the first irradiation position, as compared with a PSN decoder described later, which performs the same processing as that provided in the conventional optical disc device. Therefore, it is only necessary to execute the decoding process once for the optical information read from the optical disc. That is, the optical disk device according to the present invention does not need to repeatedly perform the decoding process having a relatively large processing load, so that the processing load is reduced and high-speed access can be realized.
[0021]
As a third aspect according to the present invention, the second address information generating means moves the laser beam irradiation position with respect to the second address information determined by the second address information determining means. By sequentially adding the first addition value according to the amount unit, the first recording value assigned to the second recording area accessed from the first irradiation position to the second irradiation position is obtained. It is assumed that second address information is generated.
The “movement amount unit” described above is, for example, “1 ATIP section unit” or “1 ECC block unit” described later, and the “first added value” is, for example, “PSAT address unit” described later. 2H "and" 16H ".
In this way, the second address information generating means differs from the PSN decoder described later in charge of the same processing provided in the conventional optical disk device, in that the second address information generating means does not perform the decoding processing many times, but performs the determined second processing. The first addition value is sequentially added to the address information of No. 2. Such an addition process requires a smaller processing load than a conventional PSN decoder that requires reading and decoding of optical information from an optical disc. That is, the optical disc device according to the present invention can reduce the processing load and realize high-speed access.
[0022]
As a fourth aspect according to the present invention, the optical disk device stores a normal first address information among the first address information generated by the first address information generating unit. The second address information determining means, when the first address information generated by the first address information generating means is not normal, adds the stored first address information to the stored first address information. Based on this, the second address information assigned to the first irradiation position is determined.
The above-mentioned “storage unit” is, for example, a “register” of an ATIP-PSN conversion unit described later.
The first address information necessary to determine the second address information for the first irradiation position is normal due to dust or dust on the optical disk, or a defect of the optical disk itself such as a scratch or an eccentric disk. In other words, the optical reading of the wobbling information may not be performed normally. Therefore, by adopting the above-described mechanism, the reliability in determining the second address information, that is, the reliability as the optical disk device according to the present invention is improved.
[0023]
As a fifth aspect according to the present invention, the second address information determining means determines the second address information associated with the stored first address information, and determines the determined second address information. A result obtained by adding a second addition value corresponding to the unit of movement amount of the laser light to the second address information is determined as the second address information assigned to the first irradiation position. .
This embodiment is an embodiment of the fourth embodiment. This improves the reliability of the determination of the second address information, that is, the reliability of the optical disk device according to the present invention. The “second added value” is, for example, “2H” or “16H” as a PSN address unit described later.
[0024]
As a sixth aspect according to the present invention, the second address information determining means adds a third addition value corresponding to the movement amount unit of the laser beam to the stored first address information. The second address information associated with the first address information obtained as a result of the addition is determined as the second address information assigned to the first irradiation position. .
This embodiment is an embodiment of the fourth embodiment. This improves the reliability of the determination of the second address information, that is, the reliability of the optical disk device according to the present invention. The above-mentioned "third addition value" is, for example, "one frame" as an ATIP address unit described later.
[0025]
As a seventh aspect according to the present invention, the optical disc has address inspection information for examining the first address information in association with track wobbling information. The first address information generation is performed based on the address inspection information associated with the wobbling information, which is read from the optical disk based on the reflected light of the laser light applied to the first irradiation position. Checking means for checking whether the first address information generated by the means is normal, and storing the first address information determined to be normal as a result of the check by the checking means in the storage means Means for storing the first address generated by the first address information generating means with respect to the second address information determining means. Distribution is to have a, and means for transmitting information indicating the result of inspection by the inspection unit in order to determine whether it is normal.
Note that the above-described “address check information” is, for example, “CRC data” to be described later, and the above-mentioned “inspection unit” is, for example, a “CRC check circuit” to be described later.
As described above, in order to realize a mechanism for determining whether or not the first address information is normal, the CRC check circuit provided in the conventional optical disk device can be effectively used. Thus, the optical disk device according to the present invention can be realized with a small change from the conventional optical disk device.
[0026]
According to an eighth aspect of the present invention, the first recording area is logically assigned to an optical disc having first address information assigned to each first recording area having a predetermined recording density. Access is controlled using second address information assigned to each of the divided second recording areas, and data recording is performed on the first recording area with a recording density higher than the predetermined recording density. In the method for controlling an optical disc apparatus, the second recording area, which is a first irradiation position of the laser beam irradiated to the optical disc, may be assigned to the second recording area. The address information is determined, and while the irradiation position of the laser beam moves from the first irradiation position to the second recording area to be a predetermined second irradiation position, the determined second address information is determined. On the basis of the, And generating a serial second address information added to the second recording area to be accessed between the first irradiation position to the second irradiation position.
[0027]
In this way, the control method of the optical disk device according to the present invention, compared with the control method of the conventional optical disk device, optically reads the ID information of the optical disk in the state of high-density recording, and reads the read ID information. There is no need to perform processing for generating (decoding) the second address information from the ID information.
This can reduce the processing load of the optical disk device according to the present invention and realize high-speed access. Further, since it is not necessary to provide a PSN decoder, which will be described later, provided in the conventional optical disk device, it is possible to realize a reduction in size, power consumption, cost, and the like.
Other features of the present invention will be apparent from the accompanying drawings and the description of the present specification.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
=== Example ===
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0029]
<System configuration>
First, a schematic configuration of a system including an optical disk device 100 according to an embodiment of the present invention will be described with reference to FIG. Here, the optical disc device 100 shown in FIG. 1 uses an address for high-density recording on an optical disc (CD standard medium) 200 conforming to a physical format of the existing CD standard such as CD-R and CD-RW. Recording and playback are possible. The physical format defines the dimensions of the optical disc 200, a recording / reproducing method, a sector configuration, and the like.
In consideration of user's convenience, it is preferable to support recording / reproduction on a CD standard medium in a standard recording mode conforming to the logical format of the CD standard. Further, the optical disk device 100 is capable of operating the optical disk 200 (DVD standard medium) based on the physical format of the DVD (Digital Versatile Disk) standard such as DVD-ROM, DVD-R, and DVD-RW / + RW. Recording / reproduction in a standard recording mode conforming to the format may be supported. Note that the logical format defines a mechanism of a data structure such as a file, a directory, and a volume.
[0030]
Hereinafter, for convenience of explanation, the optical disc 200 is a CD standard medium. In this CD standard medium, a pre-groove (guide groove) forming a track is wobbling (meandering) in accordance with an FM-modulated waveform based on absolute time information or the like. By demodulating the wobbling frequency from this pregroove, an ATIP (Absolute Time In Pregroove) address ("first address information"), which is absolute time information, can be obtained.
[0031]
In addition, the optical disc device 100 supports only a high-density recording mode using a high-density recording address or the like as a logical format used for recording / reproducing processing on a CD standard medium.
[0032]
As shown in FIG. 1, the optical disk device 100 includes an optical head 1, a front end processing unit 2, an optical head servo circuit 3, a WBL detection unit 4, an ATIP decoder ("first address information generating means") 5, and a PLL circuit 7. , High-density recording mode decoder 8, high-density recording mode encoder 9, interface unit 10, RAM 11, system control microcomputer 12, laser output control circuit 13, laser drive circuit 14, spindle motor 15, motor drive circuit 16, motor control A circuit 17.
[0033]
The optical head 1 includes an objective lens (not shown), a laser element 1a that emits laser light to the optical disc 200 via the objective lens, a light receiving element (not shown) that receives light reflected from the optical disc 200, and the like. Is incorporated. Further, the optical head 1 performs a slide mechanism for moving the optical head 1 to a track to be recorded / reproduced, and a control (tracking control) for causing laser light emitted to the optical disc 200 to follow the track to be recorded / reproduced. And a focus mechanism for performing control (focus control) for correcting the defocus of the laser light emitted to the optical disc 200 (both are not shown).
[0034]
The front-end processing unit 2 is a tracking error signal based on an RF amplifier including a matrix operation circuit, an amplification circuit, a waveform shaping circuit (equalizer), a three-beam method, a push-pull method, a DPD (Differential Phase Detection) method, or the like. A generation circuit, a focus error signal generation circuit based on an astigmatism method, a Foucault method, and the like are provided (all are not shown).
[0035]
The RF amplifier determines the presence or absence of a pit on a recording / reproduction target track based on an electric signal generated by a light receiving element (not shown) of the optical head 1 in accordance with the amount of received light. Radio frequency signal). Note that this RF signal is binarized. Further, the RF signal includes a wobbling frequency component for acquiring an ATIP address. Further, when the optical disc 200 is recorded at a high density in advance, the RF signal also includes ID information described later.
[0036]
The tracking error signal generation circuit controls the tracking control mechanism of the optical head 1 based on an electric signal generated by the light receiving element (not shown) of the optical head 1 according to the amount of received light, similarly to the above-described RF amplifier. Generate a tracking error signal for servo control. Similarly, the focus error signal generation circuit generates a focus error signal for servo-controlling the focus control mechanism of the optical head 1 based on the electric signal of the light receiving element (not shown).
[0037]
The optical head servo circuit 3 is a servo mechanism (tracking servo mechanism or focus servo mechanism) incorporated in the optical head 1 based on various error signals (tracking error signal, focus error signal, etc.) generated by the front end processing unit 2. A servo control signal for driving the mechanism. Then, the servo control of the servo mechanism is performed based on the servo control signal.
[0038]
The WBL detection unit 4 includes a BPF (Band Pass Filter) circuit, a comparator, and the like. In this configuration, the BPF circuit receives the RF signal generated by the front-end processing unit 2 and extracts a wobbling frequency component (center frequency 22.05 kHz) from the received RF signal. By comparing the wobbling frequency component with a reference voltage by a comparator, a WBL (Wobble) signal as binary data is transmitted to the ATIP decoder 5 and the motor control circuit 17.
[0039]
The ATIP decoder 5 decodes an ATIP address based on a WBL signal per ATIP section (described later) received from the WBL detection unit 4. Here, a WBL signal per ATIP section includes a pattern for synchronization detection, an identifier assigned to a recording area where the WBL signal is recorded, wobbling information including an ATIP address, a bit error of the wobbling information, and the like. (Refer to FIG. 2) and the like (see FIG. 2).
[0040]
Further, the ATIP decoder 5 has a CRC check circuit (“inspection means”) 6. The CRC check circuit 6 performs a CRC check based on the above-mentioned CRC data in order to determine whether or not the ATIP address has been correctly decoded from the WBL signal per ATIP section. Note that the method of checking the decoding result of the ATIP address is not limited to the CRC check method described above. For example, a parity check method using horizontal / vertical parity bits (“information for address check”) or an ECC ( An ECC check method using Error Correcting Code (“information for address inspection”) may be adopted.
[0041]
The PLL circuit 7 includes a phase comparator, a charge pump, an LPF, a VCO, a frequency divider, and the like. In this configuration, the PLL circuit 7 generates a clock signal used as a timing signal at the time of a decoding process according to the standard of the optical disc 200, based on the WBL signal received from the WBL detection unit 4.
[0042]
The high-density recording mode decoder 8 performs a decoding process corresponding to a logical format adopted for a reproduction process on the optical disc 200 in the high-density recording mode described above. In the present invention, a decoding process corresponding to a logical format defined by the DVD standard is adopted. In the DVD standard, EFM-plus is used as a modulation code, and RS (Reed Solomon) Product-Code is used as an error correction code. Therefore, the high-density recording mode decoder 8 outputs these signals based on the clock signal generated by the PLL circuit 7 and the RF signal detected by the front-end processing unit 2 (the input line of the RF signal is not shown). It is assumed that decoding processing is performed based on the modulation code and the error correction code.
[0043]
The high-density recording mode encoder 9 employs recording data input from an information processing device (not shown) such as a personal computer via the interface unit 14 in a recording process on the optical disc 200 in the above-described high-density recording mode. Perform encoding processing according to the logical format. In the present invention, an encoding process corresponding to a logical format defined by the DVD standard is employed in connection with the high-density recording mode decoder 8. The encoding process includes a process for forming an ECC block which is an error correction unit at the time of recording / reproducing, an EFM-plus modulation process, a scrambling process, and the like. The modulation signal is transmitted to the laser output control circuit 13.
The interface unit 10 controls transmission and reception of recording / reproducing data between the optical disc device 100 and an information processing device (not shown) such as a personal computer.
[0044]
When a reproduction request is received from the information processing apparatus (not shown) via the interface unit 10, the RAM 11 temporarily stores intermediate data being decoded by the high-density recording mode decoder 8 and reproduction data after the decoding processing. I do. The temporarily stored reproduction data is transmitted to the information processing device (not shown) via the interface unit 10.
Further, when recording data to be a recording request is input from the information processing apparatus (not shown) via the interface unit 10, the RAM 11 temporarily stores the recording data. The temporarily stored recording data is accessed at the time of the encoding process in the high-density recording mode encoder 9.
[0045]
The system control microcomputer 12 controls the overall system control of the optical disc device 100 related to recording and reproduction of the optical disc 200. In the present invention, the ATIP address decoded by the ATIP decoder 5 and the result of the CRC check performed by the CRC check circuit 6 on the ATIP address by the system control microcomputer 12 by the interrupt process for the ATIP decoder 5 (hereinafter, referred to as “the following”). (Referred to as CRC check result information).
In the present invention, the system control microcomputer 12 particularly includes an ATIP-PSN conversion unit (“second address information determination unit”) 12a and an access control unit 12d.
[0046]
The ATIP-PSN conversion unit 12a converts the ATIP address acquired from the ATIP decoder 5 into a PSN (Physical Sector Number) address (“second address information”) as a high-density recording address based on an ATIP-PSN conversion method described later. ]).
The ATIP-PSN conversion unit 12a has an ATIP correction unit 12b. The ATIP correction unit 12b determines, from among the ATIP addresses acquired from the ATIP decoder 5, the ATIP address for which the CRC check result is normal based on the CRC check result information acquired together with the ATIP address from the ATIP decoder 5, It is stored in a register ("storage means") 12c. If the CRC check result of the ATIP address obtained from the ATIP decoder 5 is not normal, the correction is made based on the (normal) ATIP address stored in the register 12c.
[0047]
The ATIP correction unit 12b is designed to take into account a case where optical reading of wobbling information is not normally performed due to dust or dust on the optical disk 200, or a defect of the optical disk 200 itself such as a scratch or an eccentric disk. This is a mechanism provided to improve the reliability of the PSN address converted by the ATIP-PSN conversion unit 12a, that is, the reliability of the optical disk device 100.
The register 12c may store the ATIP address acquired from the ATIP decoder 5 and the CRC check result information in association with each other. Further, the register 12c may be another storage means such as a RAM.
The access control unit 12e acquires the PSN address converted by the ATIP-PSN conversion unit 12a and uses it to control access to the optical disc 200, that is, a seek operation and data recording / reproduction processing.
[0048]
Note that the control of the data recording process is to start the encoding process of the recording data temporarily stored in the RAM 11 for the recording area (8 ATIP sections) of one ECC block specified by the acquired PSN address. This is to control the high density storage mode encoder 9 and the like.
Similarly, the control of the data reproduction process includes the high-density recording mode decoder 8 and the PLL circuit 7 in order to start the decoding process of the reproduction data from the recording area of one ECC block specified by the obtained PSN address. And so on.
[0049]
The access control unit 12d has an address updating unit ("second address information generating means") 12e as described below.
For example, when a seek operation is performed, the address updating unit 12e transmits the PSN address of the seek start position (“first irradiation position”) acquired from the ATIP-PSN conversion unit 12a to the information processing device (not shown). ) Is updated to the PSN address corresponding to the seek target position (“second irradiation position”) to be recorded / reproduced specified from (1). The updated PSN address is transmitted to the optical head servo circuit 3. The optical head servo circuit 3 controls a slide mechanism (not shown) of the optical head 1 to move the optical head 1 based on the PSN address received from the access control unit 12d, and irradiates the seek target position with laser light. Servo control for positioning the optical head 1 at a location where the optical head 1 is to be performed.
[0050]
In the seek operation, the optical head 1 may be moved in a direction along a track by a predetermined moving amount unit in order to improve the positioning accuracy of the optical head 1. In this case, at the timing when the system control microcomputer 12 acquires the ATIP address after the seek start position, the address updating unit 12e sets the “first addition value” corresponding to the above-described movement amount unit to the PSN address of the seek start position. (For example, the PSN address of the seek start position is updated by sequentially adding the difference PSN address “2H” between one sector. By this update, the PSN address of the recording area accessed during the seek operation is sequentially updated. Will be generated.
[0051]
The address updating unit 12e updates the PSN address even during data recording / reproduction. For example, when a recording area for a plurality of ECC blocks is sequentially accessed, the address updating unit 12e determines the ATIP address after the access start position (“first irradiation position”) in units of one ECC block. Similarly, the ATIP address at the access start position is updated by sequentially adding the “first addition value” (for example, the difference PSN address “16H” between one ECC block). By this update, PSN addresses for the sequentially accessed recording areas are sequentially generated.
[0052]
The above-described ATIP-PSN conversion unit 12a, ATIP correction unit 12b, access control unit 12d, and address update unit 12e can be realized by firmware of the system control microcomputer 12.
[0053]
The laser output control circuit 13 generates a pulse signal for driving the laser element 1a to emit laser light based on the recording modulation signal received from the high-density recording mode encoder 9. This pulse signal is transmitted to the laser drive circuit 14. The laser output control circuit 13 determines the characteristics of the recording layer of the optical disc 200 and the spot shape of the laser light under the control of the system control microcomputer 12, and determines the optimum output level of the laser light emitted from the laser element 1a. Is also set.
[0054]
The laser drive circuit 14 drives the laser element 1a to emit laser light during recording based on the pulse signal received from the laser output control circuit 13. As a result, laser light is emitted from the laser element 1a, and pits corresponding to the recording modulation signal output from the encoder 9 for high-density recording mode are formed on tracks of the optical disk. During reproduction, the laser element 1a is driven to emit laser light under the control of an APC (Automatic Power Control) circuit (not shown) provided inside or outside the front end processing unit 2. The optical head 1 is provided with a detector (not shown) for detecting the power of the laser light emitted from the laser element 1a, and the APC circuit detects the power of the laser light detected by this detector. While monitoring the power, control is performed so that the power of the laser light emitted from the laser element 1a becomes constant.
[0055]
The spindle motor 15 is a motor that drives the optical disc 200 to rotate, and the motor drive circuit 16 is a circuit that drives the spindle motor 15 to rotate. The motor control circuit 17 is a circuit for controlling the rotation drive of the spindle motor 15 in a constant linear velocity method according to the CD standard using information on the wobbling frequency based on the WBL signal received from the WBL detection unit 4. Alternatively, the rotation drive of the spindle motor 15 may be controlled by a constant angular velocity method using a pulse signal generated according to the rotation of the spindle motor 15.
[0056]
<Data structure of high-density recording mode>
The high-density recording mode as a logical format adopted by the optical disc apparatus 100 for recording / reproducing processing on the optical disc 200 which is a CD standard medium such as a CD-R or a CD-RW will be described in detail.
[0057]
First, the data structure in the standard recording mode will be described with reference to FIG. As shown in the figure, the minimum unit of data recorded on a CD standard medium is one EFM frame based on the EFM (Eight to Fourteen Modulation) modulation method of the CD standard. Then, one frame of 588 bits is constituted by the 98 EFM frame. Also, one frame generates subcode data (including a track number, index information, an absolute / relative address, etc.) composed of “P, Q, R,..., W”.
[0058]
Further, an absolute address corresponding to the wobbling information of the track is provided from the inner track to the outer track of the CD standard medium. This absolute address corresponds to an ATIP address as absolute time information. The ATIP address is usually composed of 24 bits of data, with the upper 8 bits indicating “minute”, the subsequent 8 bits indicating “second”, and the lower 8 bits indicating “frame”. In addition, each data of "minute", "second", and "frame" is represented by a binary-coded decimal number (BCD).
[0059]
The number of frames per second is “75” (00 to 74 frames). Here, a recording area set by an ATIP address corresponding to “1/75” second (hereinafter, referred to as one ATIP section; “first recording area”) is one sector treated as a recording / reproducing unit in the optical disc apparatus 100. It becomes. The recording area for one sector is usually composed of 2 kbytes, and records a sync pattern, an identifier, wobbling information, CRC data and the like as described above.
[0060]
Next, the data structure in the high-density recording mode will be described with reference to FIG. In this high-density recording mode, for example, a recording density 2.0 times that of the standard recording mode is realized. In this case, in one ATIP section, data of two sectors, that is, 4 kbytes of data is recorded. In this case, in the recording area for one sector (“second recording area”), ID information associated with the PSN address, recording data, parity bits for checking the ID information and the recording data, and the like are provided. Be recorded.
[0061]
Further, as described above, in the high-density recording mode, a modulation / demodulation method conforming to the DVD standard is adopted. Therefore, in the optical disc device 100, one ECC (Error Correction Code) block is adopted as a recording / reproducing unit. . Note that data for one ECC block is recorded in a recording area corresponding to 8 ATIP sections. That is, data of 16 sectors (32 kbytes) is recorded in one ECC block.
[0062]
<Relationship between ATIP address and PSN address>
=== Physical format ===
The physical format of the optical disc 200 adopted in the high-density recording mode will be described.
The physical format of the optical disc 200 is, for example, as shown in the upper part of FIG. As shown in the figure, the format area, PCA (Power Calibration Area), PMA (Program Memory Area), TOC (Table Of Contents) area, TOC (Table Of Contents) area, program area, and readout from the inner circumference to the outer circumference of the optical disc 200. An area is provided.
[0063]
In the format area, predetermined data (for example, all “0”) is recorded when the format processing of the optical disc 200 is performed in the high-density recording mode. The PCA is provided with a test area for performing test writing as setting control of the recording power of the laser element 1a, and a counter area for storing an address in the test area where the test writing is performed and the number of times of test writing.
The PMA is used as an area for temporarily recording recording mode information, recording start and end time information, etc. every time recording is performed on a track. After all the planned tracks are recorded, TOC information generated based on the information recorded in the PMA is recorded in the TOC area.
The program area is a user-usable area for recording and reproducing actual data. The lead-out area is an area for identifying the end position of recording and reproduction of the optical disc 200.
With the above configuration, the physical format adopted in the high-density recording mode has no pre-gap area compared to the physical format conforming to the existing CD standard, and high-density recording is possible.
[0064]
=== ATIP address ===
The ATIP address will be described in detail.
[0065]
The middle part of FIG. 4 shows ATIP address setting information obtained by the optical disc apparatus 100 decoding physical wobbling information of the pre-groove of the optical disc 200. The ATIP address has one side as a physical address assigned to a track of the optical disc 200 and one side as a logical address used by the optical disc apparatus 100 to control recording or reproduction on the optical disc 200.
[0066]
The ATIP address corresponding to the innermost side of the program area (hereinafter, referred to as a first reference ATIP address) is “00 (minute): 00 (second): 00 (frame)”. Then, in the recording area from the innermost side to the outermost side of the program area (hereinafter referred to as the outer peripheral side recording area), the first reference ATIP address is calculated by converting "1 second = 75 frames". Are simply increased in units of one frame. In the present invention, the maximum value of the ATIP address in the outer recording area is set to “89 (minute): 59 (second): 74 (frame)”.
[0067]
On the other hand, a recording area on the inner side of the first reference ATIP address (hereinafter referred to as an inner recording area) is a reserved area such as PCA or PMA which cannot be used by the user. An ATIP address is also assigned to this inner recording area. In the present invention, for example, the minimum value of the ATIP address in the inner recording area (hereinafter, referred to as a second reference ATIP address) is set to “90 (minute): 0:00 (second): 00 (frame)”. . Then, in the inner recording area, similarly to the outer recording area, an ATIP address which is obtained by simply increasing the second reference ATIP address by one frame in terms of “1 second = 75 frames” is assigned. Is done.
[0068]
=== PSN address ===
The PSN address will be described in detail.
[0069]
The lower part of FIG. 4 shows setting information of a PSN address used as a logical address when the optical disc apparatus 100 performs recording or reproduction on the optical disc 200 in the high-density recording mode.
Here, the PSN address indicates an address (y) for high-density recording calculated by “y = n × (x−m) + m” when an absolute address as the ATIP address is “x”. . Here, “n” is the magnification for the recording density (the magnification in the standard recording mode is 1), and if the recording density is 2.0 times, “n = 2.0”. “M” is a reference address.
[0070]
That is, the PSN address divides a recording area (1 ATIP section) corresponding to a unit time (“1/75” second) based on the absolute address “x” by a magnification (n) of the recording density. According to the logical format of the mode, it is assigned to a logically divided area of one ATIP section. By the recording in the high-density recording mode using the PSN address, n times data is recorded in one ATIP section, and as a result, the recording density of the optical disc 200 becomes n times.
[0071]
In the present invention, the magnification (n) of the recording density is "2", and the PSN address (m) on the innermost side of the program area is "30000H (Hexadecimal: hexadecimal)". In this case, the PSN address (y) associated with the ATIP address of the outer recording area is calculated as “y = 2 × (x (hexadecimal) −30000H) + 30000H”. For example, the PSN address corresponding to the ATIP address of “00 (minute): 00 (second): 01 (frame)” is “30002H = 2 × (30001H−30000H) + 30000H”.
[0072]
Thus, the ATIP address and the PSN address are associated with each other. This means that the optical disc apparatus 100 can use not only the PSN address but also the ATIP address when recording or reproducing data on or from the optical disc 200 in the high-density recording mode.
[0073]
=== Conversion from ATIP address to PSN address ===
FIG. 5 is a flowchart for explaining a conversion process from an ATIP address to a PSN address in the ATIP-PSN conversion unit 12a. In the following, for convenience of explanation, it is assumed that the result of the CRC check performed by the CRC check circuit 6 on the ATIP address decoded by the ATIP decoder 5 is normal.
[0074]
First, the ATIP-PSN conversion unit 12a obtains the ATIP address decoded by the ATIP decoder 5, and converts the ATIP address into the conversion variable A regarding "minute" information, the conversion variable B regarding "second" information, and the conversion variable C regarding "frame" information. Then, each information is set (S500). Then, the total number of frames TF (= (60A + B) × 75 + C) is calculated based on the set values of the conversion variables (A, B, C) (S501).
[0075]
Here, whether or not the set value of the conversion variable A is “minute” information of the ATIP address assigned to the outer recording area is determined by a conditional expression “0 (minute) ≦ A <90 (minute)”. A determination is made based on this (S502). If the set value of the conversion variable A satisfies the above-mentioned conditional expression (S502: YES), the total number of frames TF calculated in S501 is multiplied by "2" which is a magnification (n) of the recording density, and further hexadecimal. The PSN address is obtained by adding the first reference ATIP address “30000H” to the converted value. That is, the ATIP address in the outer recording area can be converted to a PSN address by a conversion formula of “(TF × 2) (H) + 30000H” (S503).
[0076]
On the other hand, if the set value of the conversion variable A does not satisfy the above-described conditional expression (S502: NO), the total frame of the second reference ATIP address “90 (minute): 00 (second): 00 (frame)” The number of PSN addresses corresponding to the difference between the number MIN_TF and the total number of frames TF calculated in S501 (hereinafter, referred to as a differential PSN address) is calculated. This difference PSN address is calculated by converting the result of “(TF−MIN_TF) × 2” into a hexadecimal number (S504). Then, by adding the hexadecimal PSN address corresponding to the second reference ATIP address “90 (minute): 00 (second): 00 (frame)” and the differential PSN address calculated in S504, the PSN is added. An address is obtained (S505).
[0077]
Thus, the ATIP-PSN conversion unit 12a converts the ATIP address into the PSN address. Note that the processing of S501 described above may be executed after S502. Further, the total frame number MIN_TF of the second reference ATIP address may be calculated in S504, or may be stored in a memory such as the RAM 11 that can be accessed by the system control microcomputer 12 in advance.
[0078]
<Operation of system control microcomputer>
Hereinafter, the operation of the system control microcomputer 12 which is responsible for the characteristic processing in the present invention will be described.
FIG. 6 is a flowchart illustrating the operation of the system control microcomputer 12. In the operation shown in the figure, for example, the optical head 1 is moved so that the irradiation position of the laser beam is moved from the seek start position (“first irradiation position”) to the seek target position (“second irradiation position”). A seek operation for moving by a predetermined moving amount unit, or recording of a plurality of ECC blocks included between an access start position (“first irradiation position”) and an access end position (“second irradiation position”) This is based on the assumption that the processing is performed when the area is sequentially accessed.
[0079]
Note that the ATIP decoder 5 continues to decode the ATIP address until the movement of the irradiation position of the laser beam ends. Therefore, the optical disc device 100 can identify the current irradiation position of the laser beam by referring to the ATIP address decoded by the ATIP decoder 5.
[0080]
In the following description, it is assumed that the processing is executed by the system control microcomputer 12 unless otherwise specified.
[0081]
First, based on the reflected light from the current irradiation position of the laser beam, the WBL detector 4 detects a WBL signal per ATIP section, and the ATIP decoder 5 further detects the WBL signal detected by the WBL detector 4. It is assumed that the ATIP address for the one ATIP section has been decoded based on It is also assumed that the CRC check circuit 6 has executed a CRC check in order to determine whether or not the ATIP decoder 5 has successfully decoded the ATIP address.
[0082]
Here, the system control microcomputer 12 acquires the ATIP address decoded by the ATIP decoder 5 and the CRC check result information when the CRC check is performed by the CRC check circuit 5b by the interrupt process to the ATIP decoder 5 (S600). Then, the ATIP-PSN conversion unit 12a determines whether or not the CRC check result information acquired in S600 indicates that the decoding process in the ATIP decoder 5 has been performed normally (S601).
[0083]
Here, when the CRC check result information acquired in S600 indicates that the CRC check result information is normal (S601: YES), the ATIP-PSN conversion unit 12a stores the ATIP address acquired in S600 in the register 12c. (S602). Further, the ATIP-PSN conversion unit 12a converts the ATIP address acquired in S600 into a PSN address (S603).
[0084]
On the other hand, if the CRC check result information acquired in S600 indicates that the CRC check result information is not normal (S601: NO), the ATIP-PSN conversion unit 12a causes the ATIP correction unit 12b to store the last (1ATIP) stored in the register 12c last. The ATIP address (before the section) is read. Then, the ATIP correcting unit 12b adds “2H (“ second added value ”)” after converting the data to the PSN address corresponding to the ATIP address (S604).
[0085]
Next, the access control unit 12d acquires the PSN address determined in S603 or S604, and starts the high-density recording mode decoder 8 (data In the case of reproduction) or the high-density recording mode encoder 9 (in the case of data recording) and the like are controlled (S605). Then, it is determined whether the PSN address determined in S603 or S604 is the PSN address of the laser light movement end position (seek target position, access end position) (S606).
[0086]
Here, when the PSN address determined in S603 or S604 is the PSN address of the movement end position (S606: YES), the processing such as the seek operation or the sequential access is ended. On the other hand, if the PSN address determined in S603 or S604 is not the PSN address of the movement end position (S606: NO), the irradiation position of the laser beam is moved to the next one ATIP section. Then, at the timing when the system control microcomputer 12 acquires the ATIP address of the next one ATIP section, the address updating unit 12e sets the PSN address determined in S603 or S604 to “2H (“ first added value ”)”. Is added (S606), and the process is executed again from the step of S605.
[0087]
The reason for adding “2H (“ first added value ”,“ second added value ”)” in S604 and S607 is that the unit of movement of the irradiation position of the laser beam is one ATIP section unit, ie, This is because it is assumed to be in units of two sectors. Therefore, when the irradiation position of the laser beam is moved in units of a plurality of ATIP sections during the seek operation, in S604 and S607, “multiple ATIP section units × 2H (“ first added value ”,“ second added value ”) ) ". When sequential access is performed in units of a plurality of ECC blocks, “16H (“ first added value ”,“ second added value ”)” is added in S604 and S607.
[0088]
Also, in S604 described above, when the CRC check result information acquired in S600 indicates that the CRC check result information is not normal (S601: NO), the ATIP-PSN conversion unit 12a reads out the information from the register 12c by the ATIP correction unit 12b. "1 frame (" third added value ") is added to the last stored ATIP address (before one ATIP section). The ATIP-PSN conversion unit 12a adds the ATIP address after the addition. May be converted to a PSN address.
[0089]
In this way, the optical disc device 100 can determine whether the PSN assigned to the recording area accessed from the movement start position to the movement end position is based on the ATIP address for the one ATIP section that is the laser light movement start position. Addresses are generated sequentially.
[0090]
Here, compared with the conventional optical disk device (see FIG. 7), the optical disk device 100 optically reads the ID information of the optical disk 100 and decodes the read ID information into a PSN address. There is no need to do it. Also, when compared with the conventional optical disk device using the example of the flowchart in FIG. 6, the step of S603 corresponds to the decoding process of the PSN address in the conventional optical disk device, but the PSN address of the movement start position of the laser beam. Is executed only once in order to obtain That is, in the conventional optical disk device, the processing load of the optical disk device 100 is remarkably reduced as compared with the decoding process of the PSN address executed every time the irradiation position of the laser beam crosses one ATIP section or one sector. is there.
[0091]
As described above, the optical disc device 100 and the control method thereof have a reduced processing load as compared with the conventional optical disc device, and at the same time, the time required for reading the ID information from the optical disc 200 and decoding the PSN address, High-speed access can be realized.
[0092]
The optical disk device 100 and its control method refer to the ATIP address constantly decoded by the ATIP decoder 5 in order to identify the position where the laser beam is currently irradiated. , The mechanism of access control to the optical disc 200 can be effectively used. This enables the optical disk device 100 to be realized by a small-scale specification change from the conventional optical disk device.
[0093]
Further, the optical disk device 100 and its control method do not need to include the PSN decoder 18 provided in the conventional optical disk device, so that the size, power consumption, cost, etc. can be realized accordingly.
[0094]
As described above, the embodiment of the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and can be variously changed without departing from the gist thereof.
[0095]
【The invention's effect】
According to the present invention, it is possible to provide an optical disk device and a control method thereof that realize a high-speed access by reducing a processing load.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a system including an optical disk device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a logical format adopted in a standard recording mode.
FIG. 3 is a diagram illustrating a logical format used in a high-density recording mode.
FIG. 4 is a diagram for explaining a relationship between a physical format of an optical disc, an ATIP address, and a PSN address.
FIG. 5 is a flowchart for explaining a processing flow in which the optical disk device according to the embodiment of the present invention converts an ATIP address into a PSN address.
FIG. 6 is a flowchart illustrating an operation of a system control microcomputer according to an embodiment of the present invention.
FIG. 7 is a block diagram illustrating a configuration of an address decoder unit included in a conventional optical disc device.
[Explanation of symbols]
1 Optical head 1a Laser element
2 Front end processing unit 3 Optical head servo circuit
4 WBL detector 5 ATIP decoder
6 CRC check circuit 7 PLL circuit
8 High-density recording mode decoder 9 High-density recording mode encoder
10 Interface section 11 RAM
12 System control microcomputer 12a ATIP-PSN converter
12b ATIP correction unit 12c register
12d access control unit 12e address update unit
13 Laser output control unit 14 Laser drive circuit
15 Spindle motor 16 Motor drive circuit
17 Motor control circuit 18 PSN decoder

Claims (8)

For an optical disc having first address information assigned to each first recording area of a predetermined recording density, the first recording area is assigned to each of the second recording areas logically divided. An optical disc device capable of controlling access using the second address information to be recorded and performing data recording on the first recording area at a recording density higher than the predetermined recording density;
Second address information determining means for determining the second address information assigned to the second recording area with respect to the second recording area as a first irradiation position of the laser light applied to the optical disc When,
While the irradiation position of the laser beam moves from the first irradiation position to the second recording area as a predetermined second irradiation position, the second position is determined based on the determined second address information. Second address information generating means for generating the second address information assigned to the second recording area accessed from the first irradiation position to the second irradiation position;
An optical disk device comprising: The optical disk is
The first address information is associated with wobbling information of a track,
The optical disc device,
The wobbling information read from the optical disk is received based on the reflected light of the laser light irradiated to the first irradiation position, and the first address information associated with the received wobbling information is received. It has a first address information generating means for generating,
The second address information determining means includes:
2. The method according to claim 1, wherein the second address information associated with the first address information is determined based on the first address information generated by the first address information generating unit. 3. Optical disk device. The second address information generating means includes:
The second address information determined by the second address information determining means is sequentially added with a first addition value in accordance with a unit of movement of the irradiation position of the laser light, whereby 3. The method according to claim 1, wherein the second address information assigned to the second recording area accessed from a first irradiation position to the second irradiation position is generated. Optical disk device. The optical disc device,
Storage means for storing normal first address information among the first address information generated by the first address information generation means,
The second address information determining means includes:
When the first address information generated by the first address information generating means is not normal, the first address information assigned to the first irradiation position is based on the stored first address information. 3. The optical disk device according to claim 2, wherein the second address information is determined. The second address information determining means includes:
The second address information corresponding to the stored first address information is determined, and the second address information corresponding to the determined second address information according to a unit of movement of the laser light is determined. The optical disk device according to claim 4, wherein a result of adding the addition value is determined as the second address information assigned to the first irradiation position. The second address information determining means includes:
A third addition value is added to the stored first address information in accordance with a unit of the movement amount of the laser beam, and the third addition value is associated with the first address information as a result of the addition. The optical disk device according to claim 4, wherein the second address information is determined as the second address information provided to the first irradiation position. The optical disk is
Address inspection information for inspecting the first address information is associated with track wobbling information,
The optical disc device,
The first address information is read from the optical disc based on the reflected light of the laser beam irradiated to the first irradiation position, and the first address information is read based on the address inspection information associated with the wobbling information. Checking means for checking whether the first address information generated by the generating means is normal;
Means for storing the first address information determined to be normal in the storage means as a result of the inspection by the inspection means,
The result of the inspection by the inspection means is shown to the second address information determination means to determine whether the first address information generated by the first address information generation means is normal. Means for transmitting information;
7. The optical disk device according to claim 4, comprising: For an optical disc having first address information assigned to each first recording area of a predetermined recording density, the first recording area is assigned to each of the second recording areas logically divided. A control method of an optical disc apparatus capable of controlling access using the second address information to be performed and recording data in the first recording area at a recording density higher than the predetermined recording density. At
For the second recording area to be the first irradiation position of the laser light irradiated on the optical disc, determine the second address information given to the second recording area,
While the irradiation position of the laser beam moves from the first irradiation position to the second recording area as a predetermined second irradiation position, the second position is determined based on the determined second address information. A method for controlling an optical disc device, comprising: generating the second address information assigned to the second recording area accessed between the first irradiation position and the second irradiation position.

Images