JPH10275349A - Device and method for recording and reproducing optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly execute the switching of land tracking and groove tracking by identifying whether the sector area of reproducing object corresponds to land track or groove track from the feature of regenerative signal and header data and further detecting the change point of land track and groove track from the header data. SOLUTION: A land/groove switching point detection circuit 70 outputs a land/groove switching signal to a tracking control circuit 48. Continuously, a CPU 50 identifies whether a sector after the header data is groove sector or land sector from the level relation of four PID numbers in the header data, detects the change point of tracks based on the information of sector types before and after the change point of land track and groove track in the header data when it can not be identified, and controls the tracking control circuit 48. Thus, the switching of land tracking and groove tracking can be exactly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus for recording data on an optical disk capable of recording data on both a spiral land track and a groove track or reproducing the recorded data, and an optical disk. It relates to a recording / reproducing method.

[0002]

2. Description of the Related Art In addition to an optical disk capable of recording data on only one of a land track and a groove track, an optical disk capable of recording data on both a land track and a groove track is known. is there.

In the latter case, during data recording and reproduction,
It is necessary to identify a land track and a groove track and switch between land tracking according to the land track and groove tracking according to the groove track. Conventionally, land tracks and groove tracks have been identified on an analog basis from the characteristics of a reproduced signal reproduced from an optical disk.

[0004]

In the case of analog discrimination as described above, there is a problem in the discrimination accuracy because the scorch is easily affected by scratches on the optical disc, meandering of the beam, and the like. For this reason, land tracking and groove tracking may be erroneously switched due to erroneous detection.

An object of the present invention has been made in view of the above circumstances, and provides an optical disk recording / reproducing apparatus and an optical disk recording / reproducing method capable of accurately switching between land tracking and groove tracking. Is to do.

[0006]

In order to solve the above-mentioned problems and achieve the object, an optical disk recording / reproducing apparatus according to the present invention is configured as follows. (1) According to the present invention, a header data area including a spiral land track and a groove track formed by a land portion and a groove portion, having a predetermined track length, and recording header data, and user data Has a plurality of continuous sector areas including a user data area in which the data is recorded, and has a land track or a groove track composed of the first to n-th continuous sector areas. In an optical disk recording / reproducing apparatus for recording or reproducing recorded data, a reproducing unit for reproducing data recorded on the optical disk and a characteristic of a reproduced signal reproduced by the reproducing unit are used as reproduction targets. The sector area is located on either the land track or the groove track. First identification means for identifying a sector area to be tracked, first tracking control means for controlling tracking according to the identification result by the first identification means, and data reproduced by the reproduction means. ,
From the identification data that can identify which of the land track and the groove track is included in the header data, the sector area having the header data is determined to be which of the land track and the groove track. Second identification means for identifying a sector area corresponding to the following, second tracking control means for controlling tracking according to the identification result by the second identification means, and data reproduced by the reproduction means. Detecting means for detecting a transition between the land track and the groove track from data indicating a position on the land track or the groove track included in the header data of the first to n-th sector areas; Tracking is performed based on the detection result by this detection means. Optical disc recording and reproducing apparatus characterized by comprising a third tracking control means Gosuru, is provided.

(2) According to the present invention, a header data area having a spiral land track and a groove track formed by a land portion and a groove portion, having a predetermined track length, and recording header data. And a user data area in which user data is recorded. A plurality of continuous sector areas including a land track or a groove track including first to n-th continuous sector areas is defined for an optical disc. In an optical disc recording / reproducing apparatus for recording data, or reproducing recorded data, a reproducing means for reproducing data recorded on the optical disc, and a reproduction target reproduced from the characteristics of a reproduced signal reproduced by the reproducing means. Which sector area is the land track or the groove track? A first identification unit for identifying a sector area corresponding to a track, and switching between land tracking according to the land track and groove tracking according to the groove track according to an identification result by the first identification unit. From the relationship between the first tracking control means for controlling and the data reproduced by the reproducing means, and a plurality of ID data included in the header data, a sector area having these ID data as header data is stored in the land area. A second identification means for identifying which of the track and the groove track the sector area corresponds to, a land tracking corresponding to the land track and the groove track according to an identification result by the second identification means; To control switching between groove tracking according to Tracking control means, and data reproduced by the reproducing means, wherein the data indicating the last sector on the land track or the groove track included in the header data of the n-th sector area, Detecting means for detecting a transition between the land track and the groove track; and third control for switching between land tracking corresponding to the land track and groove tracking corresponding to the groove track based on a detection result by the detecting means. An optical disk recording / reproducing apparatus comprising: a tracking control unit.

(3) According to the present invention, a header data area having a spiral land track and a groove track formed by a land portion and a groove portion, having a predetermined track length, and recording header data. , And a plurality of continuous sector areas including a user data area where user data is recorded.
1) In an optical disk recording / reproducing apparatus for recording data on or reproducing recorded data on an optical disk in which a format having a land track or a groove track composed of an n-th continuous sector area is defined,
A reproducing unit that reproduces data recorded on the optical disk and a characteristic of a reproduction signal reproduced by the reproducing unit, a sector area to be reproduced corresponds to either the land track or the groove track. First identification means for identifying a sector area, and first switching control for switching between land tracking according to the land track and groove tracking according to the groove track according to an identification result by the first identification means. And a sector area having the ID data as header data, which is data reproduced by the tracking control means and the reproduction means, wherein the ID data is included in the header data. Which of the tracks the sector area corresponds to A second identification unit for differentiating, and a second tracking control unit for controlling switching between land tracking according to the land track and groove tracking according to the groove track in accordance with an identification result by the second identification unit. And the data reproduced by the reproducing means, and from the data indicating the first sector on the land track or the groove track included in the header data of the first sector area, Detecting means for detecting a transition from the groove track, and third tracking control means for controlling switching between land tracking according to the land track and groove tracking according to the groove track based on a detection result by the detecting means. , Characterized by having Optical disc recording and reproducing apparatus is provided.

(4) According to the present invention, a header data area having a spiral land track and a groove track formed by a land portion and a groove portion, having a predetermined track length, and recording header data. , And a plurality of continuous sector areas including a user data area where user data is recorded.
1) In an optical disk recording / reproducing apparatus for recording data on or reproducing recorded data on an optical disk in which a format having a land track or a groove track composed of an n-th continuous sector area is defined,
A reproducing unit that reproduces data recorded on the optical disk and a characteristic of a reproduction signal reproduced by the reproducing unit, a sector area to be reproduced corresponds to either the land track or the groove track. First identification means for identifying a sector area, first tracking control means for controlling tracking according to the identification result by the first identification means, and data reproduced by the reproduction means; The magnitude relationship between the first and second ID numbers included in the header data is as follows:
When the first ID number> the second ID number, a sector area having these ID numbers as header data is identified as a sector area corresponding to the land track. When the first ID number <the second ID number ,
Second identification means for identifying a sector area having these ID numbers as header data as a sector area corresponding to the groove track, and land tracking according to the land track according to the identification result by the second identification means. And second tracking control means for controlling switching between groove tracking according to the groove track and the land track or data which is data reproduced by the reproduction means and which is included in header data of the first sector area. Data indicating that the sector is the first sector on the groove track;
1) Data indicating that the sector is immediately before the last sector on the land track or the groove track included in the header data of the sector area, or the land included in the header data of the n-th sector area. Detecting means for detecting a transition between the land track and the groove track from data indicating the last sector on the track or the groove track; and a land corresponding to the land track based on a detection result by the detecting means. An optical disk recording / reproducing apparatus is provided, comprising: third tracking control means for controlling switching between tracking and groove tracking according to the groove track at a predetermined timing.

[0010] As a result of taking the above measures, the following effects are produced. In the optical disk recording / reproducing apparatus according to the present invention, the first type of discriminating which of the land track and the groove track the sector area to be reproduced corresponds to from the characteristic of the reproduced reproduction signal. From the identification data for identifying which of the land track and the groove track included in the header data corresponds to which track area, the sector area having this header data can be identified as either the land track or the groove track. Second identification means for identifying a sector area corresponding to the above, and position data indicating a position on a land track or a groove track included in the header data (sector type data: data indicating a head sector on a track; One sector before the last sector on the track Data indicating that the track is a data track, and data indicating that the track is the last sector on the track). And the sector area corresponding to the groove track can be identified. Also, it can be identified from the identification data whether the sector area corresponds to the land track or the groove track. And the transition from can be detected. A first tracking control unit for controlling tracking according to a result of identification by the first identification unit; a second tracking control unit for controlling tracking according to an identification result by the second identification unit; And the third tracking control means for controlling the tracking in accordance with the detection result by
Tracking control based on identification data and tracking control based on position data can be performed.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention. This optical disk device records data on an optical disk (DVD-RAM) 1 as an information recording medium using focused light, or reproduces recorded data.

The optical disk 1 is formed by coating a metal film layer such as tellurium or bismuth in a donut shape on the surface of a circular substrate made of, for example, glass or plastics, and forming concentric or spiral grooves. Data recording or reproduction of recorded data is performed using both the concave portion and the land (convex portion), and header data (eg, address data) is recorded at predetermined intervals by recording marks in a mastering step. It is a phase change type and rewritable disk.

As shown in FIGS. 2 and 3, the optical disk 1 has a lead-in area 2, a data area 3, a lead-out area 4, and the like. The lead-in area 2 includes an emboss data zone 5 composed of a plurality of tracks and a rewritable data zone 6 composed of a plurality of tracks. In the emboss data zone 5, reference signals and control data are recorded at the time of manufacturing. The rewritable data zone 6 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 3 is composed of a plurality of, for example, 24 zones 3a,. The lead-out area 4 is composed of a plurality of tracks, and is a rewritable data zone, like the rewritable data zone 6, so that the same recorded contents as the data zone 6 can be recorded.

As shown in FIGS. 2 and 3, the optical disc 1 has a data zone 6 which can be rewritten with an embossed data zone 5 of the lead-in area 2, a zone 3a of the data area 3,. The lead-out area 4 is composed of 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.

In the zones 3a,..., 3x of the data area 3, the number of rotations (speed) becomes slower and the number of sectors per track increases from the inner circumference to the outer circumference of the optical disk 1. ing. Each of the above zones 3
The relationship between the speed data (number of rotations) and the number of sectors in one track for a,...

The zones 3a,... 3x of the data area 3
As shown in FIGS. 2 and 3, an ECC (error correction code) as a data recording unit
Data is recorded in advance for each block data unit (for example, 38688 bytes). As shown in FIG. 2, in the tracks of the zones 3a,... 3x of the data area 3, a header field 11 in which header data such as an address is recorded for each sector is pre-formatted in advance.

Here, the description returns to FIG. As shown in FIG. 1, the optical disc 1 is rotated by a motor 23 at a different rotation speed for each zone, for example. The motor 23 is controlled by a motor control circuit 24.

Recording of data on the optical disc 1;
Alternatively, the data recorded on the optical disc 1 is reproduced by the optical head 25 as a reproducing means. The optical head 25 is fixed to a drive coil 27 constituting a movable part of a linear motor 26. The drive coil 27 is connected to a linear motor control circuit 28.
It is connected to the.

A speed detector 29 is connected to the linear motor control circuit 28 and sends a speed signal of the optical head 25 to the linear motor control circuit 28. Further, a permanent magnet (not shown) is provided in a fixed portion of the linear motor 26, and the drive coil 27 is excited by a linear motor control circuit 28,
The optical head 25 is moved in the radial direction of the optical disc 1.

The optical head 25 has an objective lens 30
Are supported by a wire or a leaf spring (not shown), and the objective lens 30 is moved in a focusing direction (an optical axis direction of the lens) by a driving coil 31.
The drive coil 32 can move in a tracking direction (a direction orthogonal to the optical axis of the lens).

The semiconductor laser oscillator 39 is driven by the laser control circuit 33 to generate a laser beam. The laser control circuit 33 corrects the amount of laser light from the semiconductor laser oscillator 39 in accordance with the monitor current from the photodiode PD for monitoring the semiconductor laser oscillator 39.

The laser control circuit 33 includes a PLL (not shown).
It operates in synchronization with a recording clock signal from a circuit. The PLL circuit divides the frequency of a basic clock signal from an oscillator (not shown) to generate a clock signal for recording.

The laser light generated by the semiconductor laser oscillator 39 driven by the laser control circuit 33 is irradiated on the optical disk 1 via the collimator lens 40, the half prism 41, and the objective lens 30, and is irradiated from the optical disk 1. Is guided to the photodetector 44 via the objective lens 30, the half prism 41, the condenser lens 42, and the cylindrical lens 43.

The photodetector 44 is composed of four divided photodetection cells 44a, 44b, 44c and 44d. The output signal of the photodetector cell 44a of the photodetector 44 is supplied to one end of an adder 46a via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied to one end of an adder 46b via an amplifier 45b. And the light detection cell 44c
Is supplied to the other end of the adder 46a via the amplifier 45c, and the output signal of the photodetection cell 44d is supplied to the other end of the adder 46b via the amplifier 45d.

The output signal of the photodetector cell 44a of the photodetector 44 is supplied to one end of an adder 46c via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied to an amplifier 45a.
b is supplied to one end of an adder 46d, and the output signal of the photodetection cell 44c is supplied to the adder 46d via an amplifier 45c.
d, the output signal of the photodetection cell 44d is
The signal is supplied to the other end of the adder 46c via the amplifier 45d.

The output signal of the adder 46a is supplied to the inverting input terminal of the differential amplifier OP2.
Is supplied with the output signal of the adder 46b. As a result, the differential amplifier OP2 outputs a signal (focus error signal) relating to the focus point according to the difference between the adders 46a and 46b.
To be supplied. The output signal of the focusing control circuit 47 is supplied to the drive coil 31 and is controlled so that the laser beam is always just focused on the optical disc 1.

The output signal of the adder 46c is supplied to the inverting input terminal of the differential amplifier OP1.
Is supplied with the output signal of the adder 46d. As a result, the differential amplifier OP1 converts the tracking error signal into a tracking control circuit 48 as tracking control means in accordance with the difference between the adders 46c and 46d.
And a header position detection circuit 60. The tracking control circuit 48 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1. Header position detection circuit 60
Is to detect the position of the header. Various signals output from the header position detection circuit 60 are supplied to a land / groove switching point detection circuit 70. This land / groove switching point detection circuit 70
Is for detecting a switching point between a land and a groove.

The track drive signal output from the tracking control circuit 48 is supplied to the drive coil 32 in the tracking direction. The tracking error signal used in the tracking control circuit 48 is supplied to the linear motor control circuit 28.

Each light detection cell 44 of the light detector 44 in the state where focusing and tracking are performed as described above.
a, the sum signal of the outputs of .about.
The signal obtained by adding the output signal from 6d by the adder 46e is
The change in reflectivity from pits (recording data) formed on the track is reflected. This signal is supplied to a data reproducing circuit 38, where the recorded data is reproduced.

The reproduced data reproduced by the data reproducing circuit 38 is subjected to error correction by an error correcting circuit 52 using an applied error correcting code ECC, and then, via an interface circuit 55, to an optical disk as an external device. Output to control device 56.

When the tracking control circuit 48 moves the objective lens 30, the linear motor control circuit 28 controls the linear motor 26, that is, the optical motor 26 so that the objective lens 30 is located near the center position in the optical head 25. The head 25 is moved.

A data generation circuit 34 is provided at a stage preceding the laser control circuit 33. The data generation circuit 34 receives the format data of the ECC block as the recording data supplied from the error correction circuit 52,
Recording EC with synchronization code for ECC block
It has an ECC block data generation circuit 34a for converting the data into C block format data, and a modulation circuit 34b for modulating the recording data from the ECC block data generation circuit 34a by the 8-16 code conversion method.

The data generation circuit 34 is supplied with recording data to which an error correction code has been added by the error correction circuit 52 and dummy data for error checking read from the memory 10. Error correction circuit 52
Is supplied with recording data from an optical disk control device 56 as an external device via an interface circuit 55 and a bus 49.

The error correction circuit 52 converts the 32 Kbytes of recording data supplied from the optical disc control device 56 into 4K bytes.
Each of the horizontal and vertical error correction codes (ECC1, ECC1) for the recording data in the sector unit for each byte.
2), a sector ID (logical address number) is added, and format data of an ECC block is generated.

The optical disk device has a focusing control circuit 47 and a tracking control circuit 4 respectively.
8. A D / A converter 51 used for exchanging information between the linear motor control circuit 8 and the CPU 50 for controlling the entire optical disk device is provided.

The above motor control circuit 24, linear motor control circuit 28, laser control circuit 33, data reproduction circuit 3
8, a focusing control circuit 47, a tracking control circuit 48, an error correction circuit 53, etc.
This is controlled by the PU 50, and this C
The PU 50 performs a predetermined operation according to a control program recorded in the memory 10.

The memory 10 stores a control program and is used for data recording. The memory 10 has a table 10a in which the relationship between the speed data (the number of rotations) and the number of sectors on one track is recorded for each of the zones 3a,.

Next, a method (analog tracking control method) of switching between land tracking and groove tracking by detecting switching between land tracks and groove tracks in an analog manner will be briefly described.

The analog tracking control is performed by the header position detecting circuit 60, the land / groove switching point detecting circuit 70, and the tracking control circuit 48. The header position detection circuit 60 includes a differential amplifier O
Based on the track error signal supplied from P1, a header position (outer header and inner header) is detected, and a header detection signal, an outer header detection signal, and an inner header detection signal are output. The land / groove switching point detection circuit 70 detects a land / groove switching point based on the header detection signal, the outer header detection signal, and the inner header detection signal supplied from the header position detection circuit 60, and Outputs a switching signal.
The tracking control circuit 48 switches between land tracking and groove tracking based on the land / groove switching signal supplied from the land / groove switching point detection circuit 70.

Here, the header position detecting circuit 60 and the land / groove switching point detecting circuit 70 will be described with reference to FIGS. As shown in FIG. 12, the header position detection circuit 60 includes a low-pass filter (LPF) 6
1. High-pass filter (HPF) 62, slice level generator 63, differential amplifier 64, MM65, AND circuit 6
6 and an OR circuit 67. A track error signal supplied from the differential amplifier OP1 is input to the header position detection circuit 60, and a header detection signal, an inner header detection signal, and an outer header detection signal are output from the header position detection circuit 60. FIG.
The relationship between the track error signal, the header detection signal, the inner header detection signal, and the outer header detection signal is shown in FIG.

As shown in FIG. 14, the land / groove switching point detecting circuit 70
1, AND circuit 72, NAND circuit 73, OR circuit 7
4, a NOR circuit 75, an EXOR circuit 76, and the like. This land / groove switching point detection circuit 7
To 0, a header detection signal, an inner header detection signal, an outer header detection signal, a clock signal (CLK / 8) and a clock signal (CLK / 256) supplied from the header position detection circuit 60 are input.
A land / groove switching signal is output from the groove switching point detection circuit 70. FIG. 15 shows the relationship among these header detection signal, inner header detection signal, outer header detection signal, and land / groove switching signal. FIG. 15 shows various signals (S1) generated in the process of generating the land / groove switching signal from the header detection signal, the inner header detection signal, and the outer header detection signal.
To S7) are also shown.

Next, the sector format will be described with reference to FIG. FIG. 5 is a diagram schematically showing a format of one sector and a format of a header field.

As shown in FIG. 5, one sector is approximately 2 sectors.
It consists of 697 bytes, and consists of a 128-byte header field 11, a 2-byte mirror field, and a 2567-byte recording field. 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 field 11 is an area where predetermined data is recorded when the optical disc 1 is manufactured. This header field 11 has four fields,
That is, it is composed of a header 1 field, a header 2 field, a header 3 field, and a header 4 field. The header 1 field and the header 3 field are 46 bytes, the header 2 field and the header 4 field are 18 bytes, and 36 bytes or 8 bytes.
VFO (Variable Frequency Osc)
illator), 3-byte address mark AM (Address
Mark), 4-byte address part PID (Position Ident
ifier), 2-byte error detection code IED (ID Error
Detection Code) 1-byte postamble PA (Po
st Ambles).

The header 1 field and the header 3 field have a 36-byte synchronization code section VFO1, and the header field 2 and the header 4 field have an 8-byte synchronization code section VFO2. The synchronization code portions VFO1 and VFO2 are regions for pulling in the PLL. The synchronization code portion VFO1 records a sequence of "010 ..." in channel bits for "36" bytes (646 bits in channel bits) (at a constant interval). Record the pattern)
The synchronization code portion VFO2 is obtained by recording a sequence of "010 ..." in channel bits for "8" bytes (128 bits in 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.

PID1 to PID4 are areas in which 4-byte sector information (including PID numbers) and sector numbers are recorded. This P
The ID will be described later in detail.

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

Postamble PA (PA1, PA2)
Contains state information necessary for demodulation, and also has a role of polarity adjustment so that the header field 11 ends with a space.

The mirror field is used for offset correction of a tracking error signal, timing of a land / groove switching signal, and the like. The recording field is a gap field of 10 to 26 bytes, 2
Guard 1 field of 0 to 26, VFO3 of 35 bytes
Field, 3-byte PS (pre-synchronous code)
Field, 2418-byte data field, 1-byte postamble 3 (PA3) field, 48 to
It consists of a 55 byte guard 2 field and a 9 to 25 byte buffer field.

The gap field is an area where nothing is recorded. The guard 1 field 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.

Although the VFO3 field is also an area for PLL lock, it is also an area where a synchronization code is inserted in the same pattern to synchronize byte boundaries. The PS field is a tuning area for connecting to the data area.

The data field includes a data ID and a data ID error correction code IED (Data ID Error Detection Code).
Code), synchronization code, ECC (Error Collection 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 (post Amble) 3 field contains state information necessary for demodulation and is an area indicating the end of the last byte of the previous data area. The guard 2 field is an area provided to prevent the end deterioration at the time of repetitive recording peculiar to the phase change recording medium from reaching the data area.

The buffer field is an area provided to absorb fluctuations in the rotation of the motor for rotating the optical disk 1 so that the data area does not extend over the next header field 11.

Subsequently, the PID in the header field
(PID1-4) will be specifically described. PID
Is composed of a 1-byte (8-bit) sector information field and a 3-byte (24-bit) sector number field (logical sector number as a logical address indicating a logical position on a track).

Further, this sector information includes a 2-bit reserved field and a 2-bit PID.
It is composed of a number field, a 3-bit sector type field, and a 1-bit layer number field.

In this embodiment, nothing is recorded in the reserved field. A PID number is recorded in the PID number field. For example, the PID number field in the header 1 field is "00" indicating PID1, the PID number field in the header 2 field is "01" indicating PID2, and the PI in the header 3 field is PI.
“10” indicating PID3 is recorded in the D number field, and “11” indicating PID4 is recorded in the PID number field in the header 4 field.

In the present invention, land tracking and groove tracking are switched based on the relationship between the PID numbers recorded in the PID number fields in the header 1 field to the header 4 field. This PI
Switching between land tracking and groove tracking using a D number is referred to as a tracking control method using a PID number, and will be described later in detail.

In the sector type field, "00" indicating a read-only sector is set.
0, "001", "010", or "011" indicating a reserved sector (Reserved), a rewritable head sector (Rewrit) of a land or groove track.
"100" indicating that it is an able first sector), and "10" indicating that it is a rewritable last sector of a land or groove track.
1 ", the sector immediately before the rewritable last sector of the land or groove track (Rewritable before last
sector), and other rewritable sectors (Rewr) of land or groove track.
It records "111" indicating that it is an itable other sector).

In the present invention, land tracking and groove tracking are switched based on the sector type recorded in the sector type field. The switching between the land tracking and the groove tracking by the sector type is called a tracking control method by the sector type, and will be described later in detail.

“1” or “0” indicating layer 1 or 0 is recorded in the layer number field. Next, a tracking control method using a PID number will be described with reference to FIGS.

First, with reference to FIGS. 6 and 7, a description will be given of a tracking control method using a PID number of a header field 11 provided between groove sectors or between land sectors.

The header field 11 is composed of a plurality of pits P as shown in FIG. Header H1
The centers of the pits constituting 2-1 and H12-2 are located on the same line as the tangent line between the land sector L02 and the groove sector G12 (or the land sector L01 and the groove sector G11). Header H22-3 and header H22
The center of the pits constituting -4 is the groove sector G12.
And the land sector L22 (or the groove sector G11 and the land sector L21). The centers of the pits constituting the headers H32-1 and H32-2 are located at the land sector L22 and the groove sector G32 (or the land sector L21 and the groove sector G3).
It exists at a position on the same line as the tangent line of 1). Header H42
-3 and the center of the pit constituting the header H42-4 are:
The groove sector G32 and the land sector L42 (or the groove sector G31 and the land sector L41) are located on the same line. Header H52-1 and header H
The center of the pit constituting 52-2 is located in the land sector L4.
2 and the groove sector G52 (or the land sector L41 and the groove sector G51) at the same line. The centers of the pits constituting the headers H62-3 and H62-4 are located at the groove sector G52 and the land sector L62 (or the groove sector G51 and the land sector L52).
61) at a position on the same line as the tangent line.

The PI of each header of the header field 11 provided between the groove sectors
The D (physical ID number) number has a relationship as shown in FIG. For example, the PID number of each header provided between the groove sectors G11 and G12 will be described as an example. A header H12-1 (header 1 field), a header H12-2 (header 2 field), a header H22-3 (header 3 field), and a header H22-4 (header 4) are provided between the groove sectors G11 and G12. Field). The PID number of the header H12-1 is (n
+ 3N), and the PID number of the header H12-2 is (n +
3N), the PID number of the header H22-3 is (n + 2)
N), the PID number of the header H22-4 is (n + 2)
N). That is, when the PIDs of the headers provided between the groove sectors are compared, the relationship of (PID number of the header 1 field or the header 2 field)> (PID number of the header 3 field or the header 4 field) is established. I do.

On the other hand, the PID numbers of the headers in the header field 11 provided between land sectors have the relationship shown in FIG. For example, the PID number of each header provided between the land sector L21 and the land sector L22 will be described as an example. A header H is provided between the land sector L21 and the land sector L22.
32-1 (header 1 field), header H32-2
(Header 2 field), Header H22-3 (Header 3
Field) and a header H22-4 (header 4 field). Also, the P of the header H32-1
ID number is (n + N), PID of header H32-2
The number is (n + N), the PID number of the header H22-3 is (n + 2N), and the PID number of the header H22-4 is (n + 2N). That is, when the PIDs of the headers provided between the land sector and the land sector are compared, (PID of the header 1 field or the header 2 field
The relationship of (ID number) <(PID number of header 3 field or header 4 field) is established.

That is, by reproducing the header, (PID number of header 1 field or header 2 field)>
(PID of header 3 field or header 4 field
If the relationship is determined, the sector following this header is identified as a groove sector, and a reproduction process corresponding to the groove sector can be performed. vice versa,
By reproducing the header, (Header 1 field or Header 2
If the relationship of (PID number of field) <(PID number of header 3 field or header 4 field) is found, the sector following this header is identified as a land sector, and reproduction processing according to the land sector is performed. be able to.

The land sector and the groove sector are identified by the CPU 50 as identification means. Also, a reproduction process according to the identification result,
In other words, land tracking according to the land track,
And groove tracking according to the groove sector,
This is performed by a tracking control circuit as tracking control means.

Next, referring to FIGS. 8 and 9, the PID of the header field 11 provided between the groove sector and the land sector, that is, at the transition between the groove and the land.
A tracking control method using numbers will be described.

The header field 11 is composed of a plurality of pits P as shown in FIG. Header H2
The centers of the pits constituting the header 0-3 and the header H20-4 are located on the same line as the tangent to the groove sector G10 and the land sector L20. Header H30-1 and H
The center of the pit constituting 30-2 is the land sector L2.
0 and the groove sector G30 (or the groove sector G1n)
And land sector L2n) at the same line. The centers of the pits constituting the headers H40-3 and H40-4 are located between the groove sector G30 and the land sector L40 (or the land sector L2n and the groove sector G).
3n) exists on the same line as the tangent line. Header H5
The centers of the pits constituting the header 0-1 and the header H50-2 are located on the same line as the tangent of the land sector L40 and the groove sector G50 (or the groove sector G3n and the land sector L4n). The centers of the pits constituting the header H60-3 and the header H60-4 are located at the groove sector G50 and the land sector L60 (or the land sector L4).
n and the tangent to the groove sector G5n). The centers of the pits constituting the headers H70-1 and H70-2 are located on the same line as the tangent line between the land sector L60 and the groove sector G70.

The PID of each header of the header field 11 provided between the land sector and the groove sector (when changing from the land sector to the groove sector)
The (physical ID number) number has a relationship as shown in FIG. For example, the PID number of each header provided between the land sector L2n and the groove sector G30 will be described as an example. Between the land sector L2n and the groove sector G30, a header H30-1 (header 1 field), a header H30-2 (header 2 field),
A header H40-3 (header 3 field) and a header H40-4 (header 4 field) are provided.
The PID number of the header H30-1 is (m + 3
N), the PID number of the header H30-2 is (m + 3)
N), the PID number of the header H40-3 is (m + 2)
N), the PID number of the header H40-4 is (m + 2)
N). That is, when the PIDs of the headers provided between the land sector and the groove sector are compared, the relationship of (PID number of the header 1 field or the header 2 field)> (PID number of the header 3 field or the header 4 field) is established. I do.

On the other hand, the PID numbers of the headers of the header field 11 provided between the groove sector and the land sector (when changing from the groove sector to the land sector) have a relationship as shown in FIG. For example, a PID number of each header provided between the groove sector G3n and the land sector L40 will be described as an example. A header H50-1 (header 1 field) and a header H50- are provided between the groove sector G3n and the land sector L40.
2 (header 2 field), header H40-3 (header 3 field), and header H40-4 (header 4 field). The PID number of the header H50-1 is (m + N), and the PI of the header H50-2 is
The D number is (m + N), the PID number of the header H40-3 is (m + 2N), and the PID number of the header H40-4 is (m + 2N). That is, when the PIDs of the headers provided between the groove sector and the land sector are compared, the relationship of (PID number of the header 1 field or the header 2 field) <(PID number of the header 3 field or the header 4 field) is established. I do.

That is, by reproducing the header, (PID number of header 1 field or header 2 field)>
(PID of header 3 field or header 4 field
If the relationship is determined, the sector following this header is identified as a groove sector, and a reproduction process corresponding to the groove sector can be performed. vice versa,
By reproducing the header, (Header 1 field or Header 2
If the relationship of (PID number of field) <(PID number of header 3 field or header 4 field) is found, the sector following this header is identified as a land sector, and reproduction processing according to the land sector is performed. be able to.

The land sector and the groove sector are identified by the CPU 50 as identification means. Also, a reproduction process according to the identification result,
In other words, land tracking according to the land track,
And groove tracking according to the groove sector,
This is performed by a tracking control circuit as tracking control means.

As described above with reference to FIGS. 6 to 9, from the magnitude relationship between the header 1 field (or header 2 field) and the header 3 field (or header 4 field) obtained by header reproduction, the subsequent sector Whether the sector is a land sector or a groove sector can be identified. Based on this identification result, the drive coil 32 is driven by a track drive signal output from the tracking control circuit 28, and switching between land tracking and groove tracking is performed.

Next, a tracking control method based on the sector type will be described with reference to FIG. FIG.
As shown in the above, sector type information is recorded in each sector in one track (land track or groove track) as described above. That is, the head sector of the track is the “head sector”, the last sector of the track is the “last sector”, the sector immediately before the last sector of the track is the “last sector”, the head sector of the track and the track “Other sectors” are recorded as sector type information in a sector between the last sector and the sector immediately before the last sector.

Therefore, at the transition between tracks,
That is, the track change can be detected based on the sector type information recorded in the sectors before and after the land track and groove track change. For example,
If it is determined from the reproduced sector type information that this sector is the last preceding sector, it is possible to detect that the track is switched next to the next sector. If it is determined from the reproduced sector type information that this sector is the last sector, it is possible to detect that the track is switched in the next sector. Further, if it is determined from the reproduced sector type information that this sector is the first sector, it can be detected that the track has been switched. In addition,
These detections are performed by the CPU 50 as a detecting unit. The reproduction processing according to the detection result, that is, the land tracking according to the land track and the groove tracking according to the groove sector are performed by a tracking control circuit as tracking control means.

According to the present invention, switching from a land track to a groove track or from a groove track to a land track can be detected based on the sector type recorded in the sector type field. Based on this detection result, the drive coil 32 is driven by a track drive signal output from the tracking control circuit 28, and switching between land tracking and groove tracking is performed.

Next, the tracking control using the analog tracking control method, the tracking control method using the PID number, and the tracking control method using the sector type will be described with reference to the flowchart of FIG.

As shown in FIG. 11, the seek operation (ST1)
0), the track is turned on (ST12), and the analog tracking control described above is executed (ST14).

Subsequently, header reproduction is performed (ST1).
6) When the header is normally reproduced (ST18, YE
S), the above-described tracking control using the PID number is executed (ST20). The tracking control based on the PID number can be executed if at least one of PID1 and PID2 and at least one of PID3 and PID4 can be reproduced. This is because in the tracking control based on the PID number, PID1 or PID2
This is because the magnitude relationship between the PID3 and PID3 or PID4 is the point of control. If the tracking control based on the PID number is normally executed (ST22, YES), the tracking control ends.

If the tracking control based on the PID number is not normally executed (ST22, NO) and if at least one PID is reproduced (ST22)
24, YES), the tracking control based on the sector type described above is executed based on the sector type information included in the reproduced PID (ST26).

When the tracking control based on the PID number is not normally executed (ST22, NO), and when the PID cannot be reproduced (ST24, NO),
That is, when the sector type of the current sector cannot be reproduced, the current sector type is predicted from the information on the sector type of the previous sector (ST28), and tracking control is performed based on the prediction result. That is, when the previous sector is the last sector, the current sector is predicted to be the first sector, and switching is made from land tracking to groove tracking or from groove tracking to land tracking (ST30). If the sector type of the current sector and the sector type of the previous sector are unknown, the current sector type is predicted from the information on the sector type of the sector two times before.

[0084]

According to the present invention, it is possible to provide an optical disk recording / reproducing apparatus and an optical disk recording / reproducing method capable of accurately switching between land tracking and groove tracking.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a schematic configuration of an optical disc.

FIG. 3 is a block diagram showing a schematic configuration of an optical disc.

FIG. 4 is a view for explaining the number of rotations and the number of sectors per track in each zone of the optical disc.

FIG. 5 is a diagram showing a layout of a sector field, a layout of a header field, a layout of a PID field, and a layout of a sector information.

FIG. 6 is a diagram schematically showing a header field provided between a groove sector and a land sector;

FIG. 7 is a diagram schematically showing a header field provided between a groove sector and a land sector or a land sector.

FIG. 8 is a diagram schematically showing a header field provided between a groove sector and a land sector.

FIG. 9 is a diagram schematically showing a header field provided between a groove sector and a land sector.

FIG. 10 is a diagram for explaining tracking control based on a sector type.

FIG. 11 is a flowchart for explaining tracking control using analog tracking control, tracking control using a PID number, and tracking control using a sector type.

FIG. 12 is a diagram showing a schematic configuration of a header position detection circuit.

FIG. 13 is a diagram showing a relationship among a track error signal, a header detection signal, an inner header detection signal, and an outer header detection signal.

FIG. 14 is a diagram showing a schematic configuration of a land / groove switching point detection circuit.

FIG. 15 shows a header detection signal, an inner header detection signal,
The figure which shows the relationship between an outer header detection signal and a land / groove switching signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 10 ... Memory 25 ... Optical head 31, 32 ... Driving coil 33 ... Laser control circuit 38 ... Data reproduction circuit 48 ... Tracking control circuit 50 ... CPU

Claims (8)

[Claims] 1. A header data area which has a spiral land track and a groove track formed by a land part and a groove part, has a predetermined track length, and in which header data is recorded and user data are recorded. Recording or recording data on an optical disc having a plurality of continuous sector areas including a user data area and a format defined with a land track or groove track composed of first to n-th continuous sector areas An optical disc recording / reproducing apparatus for reproducing reproduced data, a reproducing means for reproducing data recorded on the optical disc, and a characteristic of a reproduced signal reproduced by the reproducing means, a sector area to be reproduced is The section corresponding to either the land track or the groove track First identification means for identifying an area, first tracking control means for controlling tracking according to an identification result by the first identification means, and data reproduced by the reproduction means, From the identification data that can identify which of the land track and the groove track is included in the header data, the sector area having the header data is assigned to which of the land track and the groove track. Second identification means for identifying a corresponding sector area; second tracking control means for controlling tracking in accordance with the identification result by the second identification means; and data reproduced by the reproduction means. The land track or the land track included in the header data of the first to n-th sector areas. Detecting means for detecting a transition between the land track and the groove track from data indicating a position on the groove track; and third tracking control means for controlling tracking based on a detection result by the detecting means. An optical disk recording / reproducing device comprising: 2. A header data area having a spiral land track and a groove track formed by a land part and a groove part, having a predetermined track length, and header data in which header data is recorded, and user data are recorded. Recording or recording data on an optical disc having a plurality of continuous sector areas including a user data area and a format defined with a land track or groove track composed of first to n-th continuous sector areas An optical disk recording / reproducing apparatus for reproducing the reproduced data; reproducing means for reproducing the data recorded on the optical disk; and a characteristic of a reproduced signal reproduced by the reproducing means, the sector area to be reproduced is The track corresponding to either the land track or the groove track A first identification unit for identifying a data area, and a first unit for controlling switching between land tracking according to the land track and groove tracking according to the groove track in accordance with an identification result by the first identification unit. Tracking control means; and data reproduced by the reproducing means, wherein, based on a relationship between a plurality of ID data included in the header data, the sector area having these ID data as header data is divided into the land track and the groove. A second identification means for identifying which track of the track corresponds to the sector area, and a land tracking corresponding to the land track and a groove corresponding to the groove track according to an identification result by the second identification means. A second tracking control means for controlling switching between tracking and From the data reproduced by the reproducing means, and from the data indicating the last sector on the land track or the groove track included in the header data of the n-th sector area, Detecting means for detecting a transition from the groove track; and third tracking control means for controlling switching between land tracking in accordance with the land track and groove tracking in accordance with the groove track based on a detection result by the detecting means. An optical disk recording / reproducing device, comprising: 3. A header data area which has a spiral land track and a groove track formed by a land portion and a groove portion, has a predetermined track length, and in which header data is recorded and user data are recorded. An optical disc having a plurality of continuous sector areas including a user data area, and a format defined with a land track or groove track including first,..., (N−1) th and n-th continuous sector areas An optical disk recording / reproducing apparatus for recording data or reproducing recorded data with respect to: a reproducing means for reproducing data recorded on the optical disc; and a reproducing signal reproduced by the reproducing means. The target sector area is either the land track or the groove track. First identification means for identifying a sector area corresponding to a track, and land tracking according to the land track and groove tracking according to the groove track according to an identification result by the first identification means. A first tracking control unit for performing switching control; and a data area reproduced by the reproduction unit, wherein a sector area having the ID data as header data is formed from a plurality of ID data included in the header data. A second identification means for identifying which of the land track and the groove track the sector area corresponds to, and a land tracking corresponding to the land track and the groove according to an identification result by the second identification means. A second method of controlling switching between groove tracking and track tracking Tracking control means; and data reproduced by the reproduction means, the data indicating that the data is a first sector on the land track or the groove track included in the header data of the first sector area, and Detecting means for detecting a transition between a track and the groove track; and third tracking for controlling switching between land tracking corresponding to the land track and groove tracking corresponding to the groove track based on a detection result by the detecting means. An optical disc recording / reproducing apparatus, comprising: control means; 4. A header data area which has a spiral land track and a groove track formed by a land portion and a groove portion, has a predetermined track length, and in which header data is recorded and user data are recorded. An optical disc having a plurality of continuous sector areas including a user data area, and a format defined with a land track or groove track including first,..., (N−1) th and n-th continuous sector areas An optical disk recording / reproducing apparatus for recording data or reproducing recorded data with respect to: a reproducing means for reproducing data recorded on the optical disc; and a reproducing signal reproduced by the reproducing means. The target sector area is either the land track or the groove track. First identification means for identifying a sector area corresponding to a disc, first tracking control means for controlling tracking according to the identification result by the first identification means, and reproduction by the reproduction means. Data, and when the magnitude relationship between the first and second ID numbers included in the header data is such that first ID number> second ID number, a sector area having these ID numbers as header data When the first ID number is smaller than the second ID number, the second ID is identified as a sector area corresponding to the groove track when the first ID number is smaller than the second ID number. And a land track corresponding to the land track according to the result of identification by the second identification means. Second tracking control means for controlling switching between locking and groove tracking according to the groove track; and the land track which is data reproduced by the reproduction means and which is included in header data of the first sector area. Or, data indicating that the sector is the first sector on the groove track, or the sector immediately before the last sector on the land track or the groove track included in the header data of the (n-1) th sector area. From the land track or the groove track included in the header data of the n-th sector area, and detects a transition between the land track and the groove track. Detection means, and this detection means And a third tracking control means for switching between land tracking according to the land track and groove tracking according to the groove track at a predetermined timing based on the detection result. Playback device. 5. A header data area having a spiral land track and a groove track formed by a land part and a groove part, having a predetermined track length, and recording header data and user data. Recording or recording data on an optical disc having a plurality of continuous sector areas including a user data area and a format defined with a land track or groove track composed of first to n-th continuous sector areas When the reproduced data is reproduced, the data recorded on the optical disk is reproduced. According to the characteristics of the reproduction signal obtained by the reproduction, the sector area to be reproduced is either the land track or the groove track. The sector area corresponding to the track of By controlling the tracking, the data obtained by the reproduction, from the identification data that can be identified as a sector area corresponding to any of the land track and the groove track included in the header data, Identifying which sector of the land track or groove track the sector area having the header data corresponds to, and controlling the tracking in accordance with the identification result by this identification; And detecting a transition between the land track and the groove track from data indicating a position on the land track or the groove track included in the header data of the first to n-th sector areas. Controls tracking based on detection results by An optical disc recording / reproducing method characterized by the above-mentioned. 6. A header data area having a spiral land track and a groove track formed by a land portion and a groove portion, having a predetermined track length, and recording header data and user data. Recording or recording data on an optical disc having a plurality of continuous sector areas including a user data area and a format defined with a land track or groove track composed of first to n-th continuous sector areas When the reproduced data is reproduced, the data recorded on the optical disk is reproduced. According to the characteristics of the reproduction signal obtained by the reproduction, the sector area to be reproduced is either the land track or the groove track. The sector area corresponding to the track of Controlling the switching between land tracking according to the land track and groove tracking according to the groove track, the relationship between a plurality of ID data included in the header data, the data being obtained by the reproduction. From these I
A sector area having D data as header data is identified as a sector area corresponding to the land track or the groove track. According to an identification result by this identification, land tracking according to the land track and Controlling the switching between groove tracking according to the groove track and the data obtained by the reproduction, and being the last sector on the land track or the groove track included in the header data of the nth sector area. A transition between the land track and the groove track is detected from the data indicating the following. Based on the detection result by this detection, switching between land tracking according to the land track and groove tracking according to the groove track is controlled. Optical disc recording and reproducing method characterized by. 7. A header data area which has a spiral land track and a groove track formed by a land portion and a groove portion, has a predetermined track length, and in which header data is recorded and user data are recorded. An optical disc having a plurality of continuous sector areas including a user data area, and a format defined with a land track or groove track including first,..., (N−1) th and n-th continuous sector areas When recording data or reproducing recorded data, the data recorded on the optical disk is reproduced. From the characteristics of the reproduction signal obtained by the reproduction, the sector area to be reproduced is By identifying which track of the land track or the groove track corresponds to the sector area, In accordance with the identification result by, the land tracking according to the land track and the groove tracking according to the groove track switching control, data obtained by the reproduction, a plurality of data included in the header data From the relationship of ID data, these I
A sector area having D data as header data is identified as a sector area corresponding to the land track or the groove track. According to an identification result by this identification, land tracking according to the land track and Controlling switching between groove tracking according to a groove track and data obtained by the reproduction, and being the first sector on the land track or the groove track included in the header data of the first sector area. A transition between the land track and the groove track is detected from the data indicating the following. Based on the detection result by this detection, switching between land tracking according to the land track and groove tracking according to the groove track is controlled. Optical disc recording and reproducing method characterized by. 8. A header data area having a spiral land track and a groove track formed by a land part and a groove part, having a predetermined track length, and recording header data and user data. An optical disc having a plurality of continuous sector areas including a user data area, and a format defined with a land track or groove track including first,..., (N−1) th and n-th continuous sector areas When recording data or reproducing recorded data, the data recorded on the optical disk is reproduced. From the characteristics of the reproduction signal obtained by the reproduction, the sector area to be reproduced is By identifying which track of the land track or the groove track corresponds to the sector area, The tracking is controlled in accordance with the identification result according to the above, and the magnitude relationship between the first and second ID numbers included in the header data, which is the data obtained by the reproduction, is expressed as: first ID number> When the ID number is 2,
A sector area having these ID numbers as header data is identified as a sector area corresponding to the land track, and when first ID number <second ID number, a sector area having these ID numbers as header data is defined as the groove area. The area is identified as a sector area corresponding to the track, and according to the identification result by this identification, switching control is performed between land tracking according to the land track and groove tracking according to the groove track. The data indicating the first sector on the land track or the groove track included in the header data of the first sector area; and the data included in the header data of the (n-1) th sector area. Land track or the groove From data indicating that it is the sector immediately before the last sector on the rack, or data indicating that it is the last sector on the land track or the groove track included in the header data of the n-th sector area, Detecting a transition between the land track and the groove track, and controlling switching between land tracking according to the land track and groove tracking according to the groove track at a predetermined timing based on a result of the detection. An optical disc recording / reproducing method characterized by the above-mentioned.