JP2000030359A - Optical disk drive - Google Patents

Abstract

(57) Abstract: The present invention predicts a header position based on a count value of an encoder, and records data in a recording area of a corresponding sector even when an address part PID of a header part cannot be read. Data can be reproduced. According to the present invention, a position of a recording area in a sector can be determined based on an encode pulse based on rotation of a spindle motor even if an address part PID of a header part cannot be reproduced. is there.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD-RAM.
The present invention relates to an optical disk device that records data on an optical disk such as an optical disk and reproduces the recorded data.

[0002]

2. Description of the Related Art Recently, DVD-RAM is used as an optical disk.
Is being developed. In the case of such a DVD-RAM,
The land and the groove are switched every track (alternately), and the header section is preformatted in units of a plurality of sectors existing in one track.
The header section and the recording area following the header section form 1
It is a unit sector area.

Tracking servo is performed by switching the polarity of tracking between the land track and the groove track. The header section is provided with a sector number as an address and information (sector type) indicating the first sector and the last sector as position information in each track.

[0004] In an optical disk apparatus that records data on such an optical disk and reproduces the recorded data, when recording or reproducing data in a predetermined sector area, a sector in a header portion is used. If the number could not be reproduced, it was determined to be a defective sector, and data could not be recorded or reproduced in the corresponding recording area.

If the information indicating the last sector in the header of the last sector in each track cannot be reproduced, the tracking polarity can be switched at an appropriate position (the switching position between the land track and the groove track). Did not.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in an optical disk apparatus for recording data on an optical disk or reproducing the recorded data, data is recorded or reproduced in a predetermined sector area. In this case, if the sector number in the header section cannot be reproduced, it is regarded as a defective sector, and there is a disadvantage that data cannot be recorded or reproduced in the corresponding recording area, and furthermore, the last sector of each track cannot be recorded. When the information indicating the last sector in the header section cannot be reproduced, the disadvantage that the tracking polarity cannot be switched at an appropriate position is eliminated. When recording data or reproducing data in a predetermined sector area. Even if the sector number in the header part could not be reproduced, the corresponding recording area An optical disc that can record data or reproduce data, and can switch the tracking polarity at an appropriate position even if information indicating the last sector in the header of the last sector in each track cannot be reproduced. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION An optical disk apparatus according to the present invention has a groove and a land recording track for recording spiral or concentric data, and has a header section composed of a fixed length of groove and land and composed of address data. And has a plurality of sectors consisting of a recording area in which data is recorded, and records data on the optical disc,
Alternatively, in a device for reproducing data recorded on an optical disk, a rotating device for rotating the optical disk, an output device for rotating with the rotating device and outputting an encode pulse corresponding to the rotation of the rotating device, and performing recording or reproducing Reproducing means for reproducing the header part of the sector, processing means for recording data in the recording area corresponding to the header part reproduced by the reproducing means, or reproducing the recorded data, and reproducing the header part by the reproducing means Counting means for counting the number of encode pulses output from the output means, and the counting means cleared when the next header portion is reproduced by the reproducing means, and the recording area of a plurality of sectors is continuously processed by the processing means. While the data is being recorded or the recorded data is being reproduced, the counting means There upon a predetermined number, determines that the recording area of the next sector, and a control means for reproducing data recorded or recording data to the recording area by the processing means.

The optical disk device of the present invention has a recording track in which spiral and concentric data are recorded and is switched between a groove and a land, and the groove and the land are alternately switched for each round of the recording track. It has a plurality of sectors each having a header section composed of address data and position data in a track with a fixed track length, and a recording area in which data is recorded, and records data on the optical disc or records data on the optical disc. The data is reproduced, and tracking with different polarities is performed between the groove track and the land track. A rotating means for rotating the optical disc, and an encode pulse which is rotated together with the rotating means and corresponds to the rotation of the rotating means. Output means for outputting, reproducing the header of the sector for recording or reproduction A reproducing unit, a processing unit for recording data in a recording area corresponding to the header portion reproduced by the reproducing unit, or reproducing the recorded data, and a position data in the track of the header portion reproduced by the reproducing unit. Judgment means for judging the first sector or the last sector in the track; counting the number of encode pulses output by the output means after the first sector is judged by the judgment means; Counting means, which is cleared when it is determined that the counting means and the processing means are performing continuous data recording or reproduction of the recorded data in the recording area of the plurality of sectors. When the count value reaches a predetermined number, it is determined that the track is to be switched,
It comprises processing means for switching the tracking polarity.

The optical disk apparatus of the present invention has a groove and a land recording track for recording spiral or concentric data, and a header and data consisting of a fixed length of groove and land and address data are recorded. A plurality of sectors each including a recording area for recording data on the optical disk or reproducing data recorded on the optical disk; rotating means for rotating the optical disk; Output means for outputting an encoded pulse having a pulse number of 1.5 times or more the maximum number of sectors in one track of the optical disk in accordance with rotation of the rotating means, and reproducing means for reproducing a header portion of a sector for recording or reproducing. The data is stored in a recording area corresponding to the header portion reproduced by the reproducing means. Processing means for recording or reproducing the recorded data; counting the number of encode pulses output by the output means from the time of reproducing the header part by the reproducing means; reproducing the next header part by the reproducing means; Counting means, which is cleared when the data is continuously recorded in the recording area of a plurality of sectors or the recorded data is reproduced by the processing means. , A control unit which determines the recording area of the next sector and records the data in the recording area or reproduces the recorded data by the processing unit.

The optical disk device of the present invention has a recording track in which spiral and concentric data are recorded and is switched between a groove and a land, and the groove and the land are alternately switched for each round of the recording track. It has a plurality of sectors each having a header section composed of address data and position data in a track with a fixed track length, and a recording area in which data is recorded, and records data on the optical disc or records data on the optical disc. A rotating means for rotating the optical disc, which is rotated together with the rotating means, and which rotates the optical disc in accordance with the rotation of the rotating means. Encoding of pulse number 1.5 times or more the maximum number of sectors in one track Output means, reproducing means for reproducing the header portion of the sector that performs recording or reproduction for outputting a pulse,
Processing means for recording data or reproducing data recorded in a recording area corresponding to the header portion reproduced by the reproducing means; and a head in each track based on position data in the track of the header portion reproduced by the reproducing means. Determining means for determining the first sector or the last sector, counting the number of encode pulses output by the output means after the first sector is determined by the determining means, and determining the last sector by the determining means. In the state where the data is continuously recorded in the recording area of a plurality of sectors or the recorded data is reproduced by the processing means, the counted value of the counting means is cleared. When the predetermined number is reached, it is determined that the track is to be switched, and the processing means for switching the tracking polarity is used. That.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an optical disk device. This optical disc device is for recording data on an optical disc (DVD-RAM) 1 and reproducing data from the optical disc 1.

This optical disk device is configured as a device capable of reading data not only from a DVD-RAM but also from other DVD disks and CD disks, and writing data to a rewritable DVD disk. .

Therefore, the optical pickup 2 is a DVD
And an objective lens 4 for CD. In the optical pickup 2, a DVD objective lens 3 is provided.
DVD and CD corresponding to the objective lens 4 for DVD and CD
A semiconductor laser unit (not shown) is provided, and one of the semiconductor laser units is selected according to whether the loaded optical disk 1 is a DVD disk or a CD disk, and is energized by a laser control unit 5 to correspond to each other. A laser beam having a predetermined wavelength. When either the DVD or CD semiconductor laser unit is selected and energized, the laser beam corresponding to the optical disk 1 is directed to the corresponding objective lens 3, 4, and the objective lens 3, 4 causes the laser beam to be directed to the optical disk 1. Converges. Data is written to or reproduced from the optical disc 1 by the converged laser beam.

The setting of the laser control unit 5 is set by the DVD data processing unit 6. The setting includes a reproduction mode for obtaining a reproduction signal, a recording mode for recording data, an erasing mode for erasing data, and a DV mode.
The DVD mode for executing data processing on the D disk and the CD mode for executing data processing on the CD disk are different. That is, in the DVD mode, the DVD
The semiconductor laser unit for CD is selected and energized, and in the CD mode, the semiconductor laser unit for CD is selected and energized. The laser beam for DVD or CD has three modes: playback mode, recording mode, and erasing mode.
The semiconductor laser unit is energized by the laser control unit 5 so that the two modes have different levels of power and generate a laser beam having a power corresponding to the mode.

The DVD disk or the CD is arranged so that the DVD disk 1 or the CD disk is arranged to face the DVD objective lens 3 and the CD objective lens 4.
The disk is transported into the apparatus by the tray 7 directly or stored in the disk cartridge 1a. A tray motor 8 for driving the tray 7 is provided in the apparatus. Also, the loaded DVD disk 1 or C
The D disk is rotatably held on a spindle motor 10 by a stamper 9.
Rotated by

An encoder 10a is provided on a rotating shaft of the spindle motor 10. This encoder 10a
A disk with a slit and this slit turn on,
It is constituted by a detector that is turned off, and outputs a pulse based on the rotation of the spindle motor 10.
The output from the encoder 10a is output to a spindle motor control circuit 91 and a counter circuit 64 in the DVD data processing unit 6, which will be described later.

When the maximum number of sectors per rotation is used as a parameter, the maximum error between the number of pulses of the encoder 10a and the estimated position of the address portion PID with respect to the number of pulses of the encoder 10a when the number of sectors is changed in increments of 20 from 20 to 200 is as follows. As shown in FIG. 2, the error can be reduced to 25% or less, which is sufficiently small if the maximum number of sectors in one rotation is 1.5 times or more.

In this embodiment, the maximum number of sectors in one rotation is 40, and the number of pulses of the encoder 10a is 60 or more. For example, as shown in FIG. 3A, an encoder output signal as shown in FIG. 3A is output from the encoder 10a to a header section 51 and a recording area 58 described later in each sector area. Is done.

The optical pickup 2 is, as shown in FIG.
The optical disc 1 is mounted on a feed mechanism (not shown) driven by the feed motor 11 and is driven by the feed mechanism.
Is moved in the radial direction.

The optical pickup 2 has a photodetector (not shown) for detecting a laser beam therein. This photodetector is reflected by the optical disc 1 and the objective lens 3,
4 to detect the laser beam returned. A detection signal (current signal) from the photodetector is converted into a voltage signal by a current / voltage converter (I / V) 12, and this signal is supplied to a reference amplifier (RF amplifier) 13 and a servo amplifier 14. . The reference amplifier 13 outputs to the DVD data processing unit 6 a tracking error signal for reproducing data in the header section 51 described later and an addition signal for reproducing data in the recording area 58. In the DVD mode, the servo signals (track error signal and focus signal) from the servo amplifier 14 are DV signals.
The signal is output to the D servo seek control unit 15, and is output to the CD servo seek control and CD data processing unit 16 in the CD mode.

As a method for optically detecting the amount of defocus, there is, for example, the following method. [Astigmatism Method] An optical element (not shown) for generating astigmatism is arranged on a detection optical path of laser light reflected by a light reflection film or a light reflection recording film of the optical disc 1, and is placed on a photodetector. This is a method for detecting a change in the shape of the irradiated laser light. The light detection area is divided into four diagonally. The difference between the diagonal sums of the detection signals obtained from the respective detection areas is calculated in the DVD servo seek control unit 15 to obtain a focus error detection signal (focus signal).

[Knife Edge Method] This is a method of arranging a knife edge that asymmetrically shields a part of the laser light reflected by the optical disk 1. The light detection area is divided into two parts, and a difference between detection signals obtained from each detection area is obtained to obtain a focus error detection signal.

Usually, either the astigmatism method or the knife edge method is employed. The optical disc 1 has spiral or concentric tracks, and information is recorded on the tracks. Information is reproduced or recorded / erased by tracing the converged spot along this track. In order to stably trace the focused spot along the track, it is necessary to optically detect the relative displacement between the track and the focused spot.

The following method is generally used as a track shift detecting method. [Phase difference detection (Differential
Phase Detection) Method] A change in the intensity distribution of the laser light reflected by the light reflection film or the light reflection recording film of the optical disk 201 on the photodetector is detected. The light detection area is divided into four on a diagonal line. The difference between the diagonal sums of the detection signals obtained from the respective detection areas is calculated in the DVD servo seek control unit 15 to obtain a track error detection signal (tracking signal).

[Push-Pull Method] A change in intensity distribution of a laser beam reflected by the optical disk 1 on a photodetector is detected. The light detection area is divided into two parts, and a track error detection signal is obtained by taking the difference between the detection signals obtained from each detection area.

[Twin-Spot Method] A diffractive element or the like is arranged in a light transmission system between the semiconductor laser element and the optical disk 1 to split the light into a plurality of wavefronts and to irradiate the optical disk 1 with ± first-order diffracted light. The change in reflected light amount is detected. A light detection area for individually detecting the reflected light amount of the + 1st-order diffracted light and the reflected light amount of the -1st-order diffracted light is arranged separately from the light detection area for detecting the reproduction signal. Get.

In the DVD mode, a focus signal, a tracking signal and a feed signal are sent from the DVD servo seek control unit 15 to the focus and tracking actuator driver and the feed motor driver 17,
The focus servo control and tracking servo control of the objective lenses 3 and 4 are performed by the driver 17.

Further, the driver 17 responds to the access signal.
Is supplied to the feed motor 11 to control the conveyance of the optical pickup 2. The DVD servo seek control unit 15 is controlled by the DVD data processing unit 6. For example, an access signal is supplied from the DVD data processing unit 6 to the DVD servo seek control unit 15 to generate a feed signal.

The spindle motor driver 18 and the tray motor driver 19 are controlled by a control signal from the DVD data processing unit 6, the spindle motor 10 and the tray motor 8 are energized, and the spindle motor 10 is rotated at a predetermined speed. The tray motor 8 controls the tray appropriately.

A reproduction signal corresponding to the data of the header section 51 supplied to the DVD data processing unit 6 is supplied to a CPU 25 described later. Thereby, the CPU 25
Determines the sector number as an address of the header section 51 based on the reproduced signal, and compares it with the sector number as an address to access (record data or reproduce recorded data). I have.

The reproduction signal corresponding to the data in the recording area 58 supplied to the DVD data processing unit 6 is stored in the RAM 2
0 is stored in the DVD data processing unit 6, and the necessary data is stored in the DVD data processing unit 6.
SCSI interface control unit having M21 and C
The reproduction processing signal is supplied to the D-ROM decoder 22 and supplied to another device, for example, a personal computer via the SCSI.

In the CD mode, a focus signal from the CD servo seek control and the CD data processing unit 16
The tracking signal and the feed signal are sent to the focus and tracking actuator driver and the feed motor driver 17, and the driver 17 performs focus servo control of the objective lenses 3 and 4 and also performs tracking servo control.

Further, the driver 17 responds to the access signal.
Is supplied to the feed motor 11 to control the conveyance of the optical pickup 2. The spindle motor driver 18 and the tray motor driver 19 are controlled by a control signal from the CD servo seek control and the CD data processing unit 16.
Is controlled, the spindle motor 10 is energized, and the spindle motor 10 is rotated at a predetermined rotation speed.
The reproduction signal supplied to the CD data processing unit 16 is
The data is processed by the processing unit 16 and output via the CD data output amplifier 23.

Each unit shown in FIG. 1 is controlled by the CPU 25 in accordance with the procedure stored in the ROM 24. RA
M26 is used as a memory of the CPU 25. next,
The structure of the DVD-RAM optical disk 1 created above will be described.

The optical disk 1 has a thickness of, for example, 0.6 m.
m, a disc-shaped substrate made of a transparent resin such as polycarbonate or acrylic, a phase-change recording film, a reflective film, a protective film, and a sheet or adhesive for bonding. Grooves and header information are recorded in an irregular shape on a transparent substrate, a recording film or the like is formed on the irregular surface, and then the irregular surfaces are adhered to each other so that recording and reproduction can be performed on both surfaces.

As shown in FIGS. 4 and 5, the optical disc 1 is composed of a groove 51 which has been wobbled for tracking and a header section 51 which is composed of a prepit (emboss pit) row indicating a track address and the like.

That is, the tracking groove is wobbled at a constant cycle in order to obtain a reference signal for data recording. At this time, the phase of the signal for wobbling the header section 51 and the tracking groove at a constant period is made to substantially match.

The header portion 51 first wobbles outward, then wobbles inward, and the wobble of the tracking groove also wobbles outward first, and then wobbles inward.

As shown in FIGS. 6 and 7, the optical disc 1 has a data zone 46 rewritable with the emboss data zone 45 of the lead-in area 42, a zone 43a of the data area 43,... The readout area 44 includes data zones. The clock signal for each zone is the same, and the rotation speed (speed) of the optical disc 1 and the number of sectors for each track are different for each zone.

A plurality of (189) lead-in areas
6) An emboss data zone 45 composed of tracks and a rewritable data zone 46 composed of a plurality of tracks. The emboss data zone 45 includes a blank zone, a reference signal zone, a blank zone, a control data zone, and a blank zone. In the emboss data zone 45, reference signals and control data are recorded at the time of manufacturing. The rewritable data zone 46 includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, and a replacement management zone as a replacement management area.

The data area 43 has a plurality (1) in the radial direction.
888), for example, 24 zones 43a,... 43x. However, only the zone 43a has 1888 tracks including the rewritable data zone 46.

The lead-out area 44 has a plurality (144
6) The track is a rewritable data zone similar to the rewritable data zone 46, and can record the same contents as the data zone 46.

43 in the data area 43
In x, the number of rotations (speed 39.78 to 16.91H
z) becomes slow, and the number of sectors per track (17 to 4)
0) increases.

The zones 43a of the data area 43,...
As shown in FIGS. 6 and 7, the track 43x has an ECC (error correction cod) as a data recording unit.
e) Block data unit (for example, 38688 bytes)
Each time, data is recorded.

The ECC block is composed of 16 sectors in which 2 Kbytes of data are recorded. For each sector, two 4-byte (32-bit) sector IDs (identification data) 1 to ID16 as address data are 2 bytes. A horizontal ECC (error) is added to main data (sector data) together with an error detection code (IED: ID error detection code) of the configuration and serves as an error correction code for reproducing data recorded in an ECC block.
correction code) 1 and ECC2 in the vertical direction are recorded. These ECCs 1 and 2 are
The error correction code is added to the data as a redundant word in order to prevent the data from being unable to be reproduced due to the defect of the data.

Each sector is composed of 172 bytes and 12 rows of data. Each row (line) is provided with a 10-byte horizontal ECC1 and 18 rows.
A vertical ECC2 for one row of a 2-byte configuration is provided. Thus, the error correction circuit 92 described later performs error correction processing for each line using the horizontal ECC 1 and performs error correction processing for each column using the vertical ECC 2. .

When the ECC block is recorded on the optical disc 1, when data is reproduced for each predetermined data amount of each sector (for each predetermined data length interval, for example, 91 bytes: 1456 channel bits), byte synchronization is required. Synchronization code to take (2 bytes: 32 channel bits)
Is given.

Each sector is composed of 26 frames from the 0th frame to the 25th frame, and a synchronization code (frame synchronization signal) assigned to each frame is
A specific code (1 byte:
16 bits) and a common code (1 byte: 16 channel bits) common to each frame.

The zones 43a of the data area 43,...
As shown in FIG. 6 and FIG. 7, a header section 51,..., Which records a sector number or the like as an address for each sector, is pre-formatted on the 43x track in advance.

The header section 51 is formed when the groove is formed. This header section 51
Is composed of a plurality of header areas 52 composed of a plurality of pits, as shown in FIGS.
3 is preformatted as shown in the figure, and the center of the pit is located on the same line as the center of the amplitude of the boundary line between the groove 53 and the land 54. FIG. 8 shows a header section 51 given to the first sector of each track, and FIG. 9 shows a header section 51 given to a sector in the middle of each track.

In this case, the header portions for the grooves and the header portions for the lands are formed alternately (in a staggered manner). The format for each sector is shown in FIG.

In FIG. 10, one sector is composed of 2697 bytes (bytes), a 128-byte header area (corresponding to the header section 51) 51, and a 2-byte mirror area 5
It comprises a recording area 58 of 7,2567 bytes.

The channel bits recorded in the sector have a format in which 8-bit data is modulated into 16-bit channel bits by 8-16 code. The header area 51 is an area where predetermined data is recorded when the optical disc 1 is manufactured. This header area 51
It is composed of four header 1 areas, two header areas, three header areas, and four header areas.

The header 1 area to the header 4 area are each composed of 46 bytes or 18 bytes, and a 36-byte or 8-byte synchronization code portion VFO (Variable Frequency O).
scillator), 3-byte address mark AM (Addres
s Mark), 4-byte address part PID (Position Ide)
ntifier), 2-byte error detection code IED (ID Err
or Detection Code) 1 byte postamble PA
(Postambles).

The header 1 area and the header 3 area have a 36-byte synchronization code section VFO1, and the header area 2 and the header 4 area have an 8-byte synchronization code section VFO2.

The synchronous code portions VFO1 and VFO2 are areas for pulling in the PLL. The synchronous code portion VFO1 records a sequence of "010 ..." in channel bits for "36" bytes (576 bits in channel bits) ( (Recording a pattern at a fixed interval), and the synchronization code portion VFO
Reference numeral 2 denotes a sequence of “010...” Of channel bits recorded for “8” bytes (128 bits of channel bits).

The address mark AM is a "3" byte synchronization code indicating where the sector address starts. As a pattern of each byte of the address mark AM, a special pattern which does not appear in the data portion of "0110010000000100" is used.

The address sections PID1 to PID4 are areas in which a sector number as a 4-byte address is recorded. The sector number is a physical sector number as a physical address indicating a physical position on a track of the optical disc 1. Since this physical sector number is recorded in a mastering process, it cannot be rewritten.

The address part PID (1-4) is composed of 1-byte (8-bit) sector information and 3-byte sector number (physical sector number as a physical address indicating a physical position on a track). Have been. The sector information includes a 2-bit reserved area and a 2-bit physical I
It is composed of a D number area, a 3-bit sector type area, and a 1-bit layer number area.

The physical ID number is, for example, “1” in the case of PID1, and is a number indicating the number of the overwriting four times in one header section 51. In the sector type area, codes indicating the first sector, the last sector, and the like in the track are recorded.

The error detection code IED is an error (error) detection code for a sector address (including an ID number).
It is possible to detect the presence or absence of an error in the read PID.

The postamble PA includes state information necessary for demodulation, and also has a role of adjusting the polarity so that the header section 51 ends with a space. The mirror area 57 is used for offset correction of a tracking error signal, timing generation of a land / groove switching signal, and the like.

The recording area 58 has a gap area of 10 to 26 bytes, a guard 1 area of 20 to 26 bytes, and a V area of 35 bytes.
FO3 area, 3-byte pre-synchronous code (P
S) area, data area of 2418 bytes, postamble 3 (PA3) area of 1 byte, guard 2 area of 48 to 55 bytes, and buffer area of 9 to 25 bytes.

The gap area is an area where nothing is written. The guard 1 area is an area provided in order to prevent terminal deterioration at the time of repetitive recording peculiar to the phase change recording medium from reaching the VFO3 area.

The VFO3 area is also an area for PLL lock, but is also an area for inserting a synchronization code in the same pattern to synchronize byte boundaries. PS
The (pre-synchronous code) area is a tuning area for connecting to a data area.

The data area includes a data ID and a data ID error correction code IED (Data ID Error Detection Code).
e), synchronization code, ECC (Error Correction Code)
), An EDC (Error Detection Code), user data, and the like. The data ID is a sector ID 1 of 4 bytes (32 channel bits) of each sector.
~ ID16. Data ID error correction code IED
Is a 2-byte (16-bit) error correction code for data ID.

The PA (postamble) 3 area includes state information necessary for demodulation, and indicates the end of the last byte of the previous data area. The guard 2 area is an area provided to prevent the end deterioration at the time of repeated recording peculiar to the phase change recording medium from reaching the data area.

The buffer area is an area provided for absorbing rotation fluctuations of the motor for rotating the optical disk 1 so that the data area does not cover the next header section 51.

The reason why the gap area is expressed as 10 + J / 16 bytes is that a random shift is performed. The random shift is to shift the data write start position in order to reduce the repetitive recording deterioration of the phase change recording medium. The length of the random shift is adjusted by the length of the buffer area located at the end of the data area, and the entire length of one sector is fixed at 2697 bytes.

The zones 43a of the data area 43,...
As described above, spare sectors are prepared in the 43x, and are used as final spares when a sector-based slip replacement process (slipping replacement algorithm) is performed in the same zone. .

Next, in the DVD data processing unit 6, as shown in FIG. 11, a demodulation section 61 for demodulating data in the recording area 58 and a demodulation section 62 for demodulating data in the address section PID of the header section 51. , The spindle motor control unit 63 for controlling the drive of the spindle motor driver 18, cleared each time the header unit 51 is reproduced, and
The counter circuit 64 that counts the number of encode pulses output from the encoder 10a is cleared each time the last header section 51 (or the first header section 51) is reproduced.
A counter circuit 65 for counting the number of encode pulses output from a is provided.

The counter circuit 64 outputs a signal indicating the recording area of the next sector when the number of encode pulses (predetermined value) for one sector in each zone is counted without being cleared. .

The counter circuit 65 outputs a signal indicating switching of tracking when the output means counts the number of encode pulses for one round without being cleared.

The demodulation section 61 equalizes the waveform of the added signal from the RF amplifier 13 with a waveform equalizing circuit 71. The demodulating section 61 binarizes the reproduced RF signal whose waveform is equalized by the waveform equalizing circuit 71.
A binarization circuit 72 for obtaining 16 signals, a PLL circuit 73 for generating a PLL clock synchronized with the 8-16 signal from the binarization circuit 72, and a binarization circuit 72 using the PLL clock from the PLL circuit 73 And a demodulation circuit 74 for detecting a synchronization signal from the 8-16 signal from the controller, separating the data, and performing 8-16 demodulation.

The demodulation section 62 detects the address mark AM from the tracking error signal from the RF amplifier 13 and extracts the signal of the address section PID following the address mark AM. The address section PID extracted by the PID extraction circuit 81 Binarization circuit 82 for binarizing the signal of
A PLL circuit 83 for generating a PLL clock synchronized with a signal from the value conversion circuit 82;
A demodulation circuit 84 demodulates the signal from the binarization circuit 82 using the L clock.

The spindle motor control unit 63 includes a spindle motor control circuit 91 for controlling the spindle motor driver 18 and an oscillator 9 for generating a clock of a predetermined frequency.
2. A frequency divider 93 for dividing the frequency of the clock from the oscillator 92 based on the frequency division ratio based on the number of rotations controlled by the CPU 25.

The spindle motor control circuit 91 outputs an encode signal (the spindle motor 1) from the encoder 10a.
A spindle motor drive signal is output to the spindle motor driver 18 in accordance with the current rotational speed of 0 (zero) and the signal from the frequency divider 93 (corresponding to the rotational speed to be controlled).

The counter circuit 64 is cleared by a clear signal from the CPU 25 at the time of identifying the address part PID of the header part 51, and counts the number of pulses of the encode signal from the encoder 10a to determine the start position of the next header part 51. Is output to the CPU 25.

With such a configuration, the added signal from the RF amplifier 13 is waveform-equalized by the waveform equalization circuit 71.
The reproduced RF signal whose waveform has been equalized is binarized by the binarization circuit 72 to obtain an 8-16 signal, and the binarization circuit 72 uses the PLL clock from the PLL circuit 73 synchronized with the 8-16 signal. The synchronization signal is detected from the 8-16 signal of
The data is separated, 8-16 demodulation is performed by the demodulation circuit 74, and the reproduction data of the recording area 58 is output to the CPU 25.

Further, based on the detection of the address mark AM, the PID extraction circuit 81 extracts the signal of the address part PID following the tracking error signal from the RF amplifier 13 based on the detection of the address mark AM, and converts the signal of the address part PID into the binarization circuit 8.
The data is separated from the binarized signal from the binarizing circuit 82 by using the PLL clock from the PLL circuit 83 synchronized with the signal binarized by 2, demodulated by the demodulating circuit 84, and sent to the CPU 25 by the demodulator 84. Playback data is output.

The CPU 25 counts the number of encode pulses from the previous switching from the groove track to the land track or from the switching from the land track to the groove track by the counting circuit 65, and stores the count for one track. Even when the address portion PID in the header section 51 of the last sector cannot be reproduced, the polarity of tracking in the DVD servo seek control unit 15 is switched based on the count value.

Therefore, if the number of pulses by the encoder 10a is set to 1.5 times or more the maximum number of sectors in one rotation and the address PID cannot be read due to a scratch or the like on the optical disc 1, the recording / reproducing position and the land are not read. The switching position of the tracking polarity for the group is inferred by counting the pulses of the encoder 10a.

That is, when one of the address parts PID in the predetermined header part 51 is read, the counter circuit 64
Is reset, and the number corresponding to the position where the address part PID appears in the next header part 51 is counted. When the counting by the counter circuit 64 is completed, the address part PID is detected at that position. At this time, a different value for the count end value of the counter circuit 64 is set in advance by the CPU 25 for each zone. If the address part PID cannot be read, recording and reproduction are performed when the counting of the number of times that the next address part PID originally appears is completed.

At this time, the tracking polarity is switched based on the count value of the count circuit 65.
When reproducing the code indicating the last sector from the sector type area in the address part PID, the CPU 25 sets the DVD
The tracking polarity in the servo seek control unit 15 is switched.

The CPU 25 determines the address of the header section 51 based on the demodulated output of the address section PID from the demodulation circuit 84 of the demodulation section 62, and determines whether or not the address is an address to be accessed. The data demodulated from the demodulation circuit 74 of the demodulation circuit 74 to the recording area 58 is temporarily written into the RAM 20 as a DVD correction memory by the PLL clock from the PLL circuit 73, and then subjected to a correction process according to the DVD format for correction. After completion, the data is read from the RAM 20 and output to the SCSI interface control unit and the CD-ROM decoder 22 together with the DVD synchronization signal.

Next, a description will be given of a process for continuously recording data or reproducing recorded data over a plurality of sectors in the above configuration. For example, when an access instruction for recording and reproduction, that is, the number of sectors is supplied to the CPU 25 from an external device such as a PC (not shown), the CPU 25 rotates the spindle motor at the rotation speed of the zone corresponding to the number of sectors. Also, the CPU 25
Controls the movement of the optical pickup 2 to the track corresponding to the number of sectors. The CPU 25 sets the number of pulses of the encoder 10a corresponding to the sector interval determined by the number of sectors in the zone in the counter circuit 64.

When reproducing the address portion PID of the header portion 51 of each sector, the CPU 25 determines the sector number and determines whether the sector is the start sector, the last sector, or any other sector. In the case of the last sector, the count value of the count circuit 65 is cleared at the end of the recording and reproduction processing for that sector.

In such a state, after the recording and reproduction of the recording area 58 are performed based on the reproduction of the header area 51 for the predetermined sector, the counting circuit 64
When the address part PID of the header part 51 of the next sector cannot be reproduced even if the count value reaches a predetermined count value, it is determined that the reproduction of the header part 51 is abnormal. Perform recording and playback.

When the header section 51 cannot be reproduced, the CPU 25 determines whether or not the count value of the count circuit 65 has reached the number of encode pulses in one track. Judge as the last sector, and switch the tracking polarity in the DVD servo seek control unit 15.

As described above, the position of the recording area in the sector can be determined based on the encode pulse based on the rotation of the spindle motor, even if the address part PID of the header part cannot be reproduced. .

Thus, the address part PID of the header part
Can be recorded / reproduced at the position of the recording area in the sector even if the data cannot be reproduced. Also, by counting the number of encode pulses from the start sector for each predetermined track, when the number of the final sectors of one track for each corresponding zone is reached,
Even when the code indicating the last sector is not reproduced by the header portion, the tracking polarity is switched.

Thus, when the irradiation position of the laser beam by the optical pickup shifts from a land track to a groove track or from a groove track to a land track, the polarity of tracking can be reliably switched.

In the above-described embodiment, the case where the counter circuit counts the pulse as the encode signal from the encoder as shown in FIG. 11 has been described. However, the present invention is not limited to this, and FIG. The pulse of the frequency divider 92 used for the reference signal for controlling the spindle motor may be used in place of the above pulse.

In this case, since the pulse from the encoder 10a and the signal from the frequency divider 92 are synchronized, the operation is the same as when the pulse from the encoder 10a is used. In FIG. 13, an output signal of the PLL circuit 83 which is a reference signal for sector number demodulation may be used instead of the pulse from the encoder 10a.

In this case, the pulse of the encoder 10a and P
Since the output signal of the LL circuit 83 is synchronized, the same operation is performed when the pulse of the encoder 10a is used. In FIG. 14, an output signal of the PLL circuit 73, which is a data demodulation reference signal, may be used instead of the pulse of the encoder 10a. In this case, since the pulse of the encoder 10a and the output signal of the PLL circuit 73 are synchronized, the same operation is performed when the pulse of the encoder 10a is used.

[0096]

As described above in detail, according to the present invention, when data is recorded or reproduced in a predetermined sector area, even if the sector number in the header part cannot be reproduced, it is possible to cope with the problem. The polarity of tracking can be switched at an appropriate position even when data can be recorded or reproduced in the recording area, and even when information indicating the last sector in the header of the last sector in each track cannot be reproduced. An optical disk device capable of performing the above can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a maximum error between an estimated position of an address part PID and a pulse number of an encoder.

FIG. 3 is a diagram for explaining an encoder output signal for a header section and a recording area in each sector area.

FIG. 4 is a plan view showing a schematic configuration of an optical disc.

FIG. 5 is a diagram showing a wobble state of a header portion and a groove portion of the optical disc.

FIG. 6 is a plan view showing a schematic configuration of an optical disc.

FIG. 7 is a plan view showing a schematic configuration of an optical disc.

FIG. 8 is a view for explaining states of preformat data in a header portion of the optical disc, and surrounding grooves and lands.

FIG. 9 is a view for explaining the state of preformat data in a header portion of an optical disc and peripheral grooves and lands.

FIG. 10 is a diagram showing a sector format for each sector.

FIG. 11 is a block diagram showing a schematic configuration of a DVD data processing unit.

FIG. 12 is a block diagram showing a schematic configuration of another embodiment of the DVD data processing unit.

FIG. 13 is a block diagram showing a schematic configuration of another embodiment of the DVD data processing unit.

FIG. 14 is a block diagram showing a schematic configuration in another embodiment of a DVD data processing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Optical pickup 3 ... Objective lens 6 ... DVD data processing unit 14 ... Servo amplifier 15 ... DVD servo seek control unit 17 ... Driver 51 ... Header part 58 ... Recording area 61, 62 ... Demodulation part 63 ... Spindle motor control Part 64, 65 ... count circuit

Claims (4)

[Claims] The present invention has a groove and land recording track for recording spiral or concentric data, and comprises a header section composed of grooves and lands of a fixed length and composed of address data, and a recording area for recording data. An optical disc apparatus having a plurality of sectors, for recording data on the optical disc or reproducing data recorded on the optical disc, comprising: a rotating means for rotating the optical disc; Output means for outputting an encoding pulse corresponding to the rotation of the means; reproducing means for reproducing a header portion of a sector for recording or reproducing; recording or recording of data in a recording area corresponding to the header reproduced by the reproducing means; Processing means for reproducing recorded data; and Counting the number of encode pulses output by the output means from the time of reproduction of the section, and counting means cleared when the next header section is reproduced by the reproduction means; and a recording area of a plurality of sectors by the processing means. If the count value of the counting means reaches a predetermined number while data is being recorded or the recorded data is being reproduced continuously, it is determined that the recording area is the recording area of the next sector. Control means for recording data in a recording area or reproducing recorded data by the means. 2. A recording track for switching between a groove and a land for recording spiral or concentric data, wherein the groove and the land are alternately switched for each round of the recording track, and a fixed track length is provided. Has a plurality of sectors consisting of a header part consisting of address data and position data in a track and a recording area where data is recorded,
An optical disc device that records data on the optical disc or reproduces data recorded on the optical disc and performs tracking with different polarities between a groove track and a land track; a rotating unit that rotates the optical disc; Output means for rotating the rotating means and outputting an encode pulse corresponding to the rotation of the rotating means; reproducing means for reproducing a header of a sector for recording or reproducing; and corresponding to the header reproduced by the reproducing means. Processing means for recording data in a recording area to be reproduced or reproducing data recorded in the recording area, and determining the first sector or the last sector in each track based on the position data in the track of the header portion reproduced by the reproducing means. Means and the first sector by this determination means. From it is determined,
A counting means for counting the number of encode pulses output by the output means and being cleared when the last sector is determined by the determination means; and a recording area of a plurality of sectors by the processing means. Processing means for determining that the track is to be switched when the count value of the counting means has reached a predetermined number while data is being recorded or reproducing the recorded data, and for switching the tracking polarity; An optical disk device comprising: 3. It has a groove and a land recording track for recording spiral or concentric data, and comprises a header part composed of grooves and lands of a fixed length and composed of address data and a recording area for recording data. An optical disc apparatus having a plurality of sectors, for recording data on the optical disc or reproducing data recorded on the optical disc, comprising: a rotating means for rotating the optical disc; Output means for outputting an encoded pulse having a pulse number of 1.5 times or more the maximum number of sectors in one track of the optical disk in accordance with rotation of the means; reproducing means for reproducing a header portion of a sector to be recorded or reproduced; Data is recorded in the recording area corresponding to the header portion reproduced by the reproducing means. Processing means for reproducing the recorded data, and the reproducing means counts the number of encode pulses output from the output means from the time of reproducing the header part, and reproduces the next header part by the reproducing means. A counting means that is cleared at the time of reproduction; and a state that the count value of the counting means is in a state where the data is continuously recorded in the recording area of a plurality of sectors or the recorded data is reproduced by the processing means. And control means for judging the recording area of the next sector when the number reaches a predetermined number, and recording the data in the recording area or reproducing the recorded data by the processing means. Optical disk device. 4. A recording track for switching between a groove and a land for recording spiral or concentric data, wherein the groove and the land are alternately switched for each round of the recording track, and a fixed track length is provided. Has a plurality of sectors consisting of a header part consisting of address data and position data in a track and a recording area where data is recorded,
An optical disc device that records data on the optical disc or reproduces data recorded on the optical disc and performs tracking with different polarities between a groove track and a land track; a rotating unit that rotates the optical disc; An output unit that is rotated together with the rotation unit and outputs an encode pulse having a pulse number of 1.5 times or more the maximum number of sectors of one track on the optical disk in accordance with the rotation of the rotation unit; and a header of a sector for recording or reproduction. Reproducing means for reproducing a part, a processing means for recording data in a recording area corresponding to the header part reproduced by the reproducing means, or reproducing the recorded data, and a header part reproduced by the reproducing means. First sector in each track according to position data in the track Rui determination means for determining the final sector, since the head of the sector is determined by the determination means,
A counting means for counting the number of encode pulses output by the output means and being cleared when the last sector is determined by the determination means; and a recording area of a plurality of sectors by the processing means. Processing means for determining that the track is to be switched when the count value of the counting means has reached a predetermined number while data is being recorded or reproducing the recorded data, and for switching the tracking polarity; An optical disk device comprising: