JPH1139802A - Optical disk and apparatus for forming optical disk prototype and optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record and reproduce data such as animation or the like without decreasing a transmission speed and adding a special circuit while securing the same transmission rate, by making constant a product of a revolution number for each zone and a corresponding count of sector areas per one track for the zone. SOLUTION: A revolution number (39.78-19.91 Hz) is decreased towards an outer circumference from an inner circumference of an optical disk 1 at zones 43a,... 43x of a data area 43, while a count of sectors (17-40) per one track is increased. The revolution number at each zone 43a,... 43x is set so that a product of the revolution number with the corresponding count of sectors of the zone 43a,... 43x is constant. Accordingly, a transmission rate is nearly constant on the optical disk 1, and a constant user data bit rate is secured all over the optical disk 1. In other words, serial data such as animation or the like can be recorded, reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk on which data is recorded and from which recorded data is reproduced, an optical disk master manufacturing apparatus used for producing the optical disk, and a method for recording data on the optical disk. And an optical disk device for reproducing data recorded on an optical disk.

[0002]

2. Description of the Related Art Recently, a digital video disk (DVD) has been developed as an optical disk of a large-capacity recording medium, and an optical disk apparatus for recording data on the optical disk and reproducing data recorded on the optical disk has been developed. Is being developed.

[0003] The optical disk of such an optical disk device has a plurality of annular zones each comprising a plurality of tracks.
It is divided in the radial direction of the optical disc, and the number of sectors per track in each zone is the same. Each time the zone moves from the inner zone to the outer zone, the The number of sectors increases by one.

In the above-described optical disk apparatus, recording can be performed only at a substantially fixed linear velocity (the moving speed of the track on the optical disk by the laser light of the optical head is almost constant) due to the characteristics of the optical disk. For this reason, at the time of data recording, rotation is performed at a different rotation speed for each zone. In other words, the rotation is performed at a rotational speed that becomes slower each time the zone moves from the inner zone to the outer zone.

Also, during reproduction, the number of revolutions is changed for each zone in the radial direction as in recording. In such an optical disk device, the data transfer rate at the time of reproduction is different for each zone.

For this reason, when a moving image is recorded and reproduced as data, the transfer rate is different for each zone, so a circuit for adjusting the transfer rate to the same is required. Therefore, there is a disadvantage that the transfer speed is low.

[0007]

SUMMARY OF THE INVENTION According to the present invention, the same transfer rate can be secured without reducing the transfer rate, and the recording of data such as moving images can be performed without adding a special circuit.
It is an object of the present invention to provide an optical disk capable of performing reproduction, an optical disk master manufacturing apparatus, and an optical disk apparatus.

[0008]

An optical disk according to the present invention has a spiral or concentric track on which data is recorded, and this track is composed of a groove and a land in one turn, and a plurality of tracks are provided. A plurality of continuous sectors each including a plurality of zones, each zone having a predetermined track length, and including an address area where address data indicating a position on the track is recorded and a recording area where recording data is recorded. A format is defined in which a plurality of areas are provided, and the number of sector areas per track is increased by one each time the zone moves from the inner zone to the outer zone. Error correction data for reproducing recorded data recorded in these predetermined number of sector areas. However, recording is performed in units of a block area including an error correction data recording area which is collectively recorded with respect to a set of a predetermined number of sector areas, and is gradually delayed every time a transition is made from an inner zone to an outer zone. In the case of rotating at a certain number of revolutions, the product of the number of revolutions of each zone and the number of sector areas per track corresponding to each zone is a constant value.

An optical disk master manufacturing apparatus according to the present invention comprises:
The track has a spiral or concentric track on which data is recorded. The track is composed of grooves and lands in one turn, and is composed of a plurality of zones of a plurality of tracks. Each zone has a predetermined track length. Consisting of
And a plurality of continuous sector areas including an address area where address data indicating a position on a track is recorded and a recording area where recording data is recorded,
A format is defined in which the number of sector areas per track is increased by one each time the zone moves from the inner zone to the outer zone, and a group of a predetermined number of sector areas among a plurality of sector areas is defined. A block area including an error correction data recording area in which error correction data for reproducing recording data recorded in the predetermined number of sector areas is collectively recorded with respect to a set of the predetermined number of sector areas. In manufacturing a master disc for an optical disc that is recorded in units and is rotated at a rotational speed that gradually decreases as the zone moves from the inner zone to the outer zone, each zone corresponds to the number of rotations of each zone. The master is manufactured such that the product of the number of sector areas per track for each is a constant value.

The optical disk device of the present invention has a spiral or concentric track on which data is recorded, and this track is composed of grooves and lands in one turn, and is composed of a plurality of zones of a plurality of tracks. For each zone, a plurality of continuous sector areas each having a predetermined track length and including an address area in which address data indicating a position on the track is recorded and a recording area in which recording data is recorded are provided. A format is defined in which the number of sector areas per track is increased by one each time the zone is shifted from the inner zone to the outer zone, and a predetermined number of sectors among a plurality of sector areas are defined. The error correction data for reproducing the recording data recorded in the predetermined number of sector areas comprises a predetermined number of areas. For an optical disc on which recording is performed in block area units including an error correction data recording area which is collectively recorded with respect to a group of sector areas, every time the optical disc moves from an inner zone to an outer zone. The number of sector areas per track in each zone corresponding to the number of rotations in each zone when data is recorded or the recorded data is reproduced in a state in which the number of rotations is sequentially reduced at a slower rate. Are constant values.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an apparatus for manufacturing an optical disk master according to an embodiment of the present invention; FIG. 1 shows a cutting apparatus for producing a master glass (mastering step) when producing a stamper. In FIG. 1, when a cutting apparatus prepares a glass master for an optical disk (RAM) for recording and reproduction, a photo-resist is applied to a glass substrate 1 having no irregularities by turning on and off a laser power. By melting the resist, a concave portion (groove) of the track and a minute concave recording mark (pit) are formed.

In FIG. 1, a glass substrate 1 coated with a photoresist is rotated by a motor 3 at different rotational speeds, for example, at positions corresponding to respective zones described later. The motor 3 is controlled by a motor control circuit 4.

The cutting process on the glass substrate 1 is performed by the optical head 5. The optical head 5 is fixed to a drive coil 7 that constitutes a movable portion of a linear motor 6, and the drive coil 7 is connected to a linear motor control circuit 8
It is connected to the.

A speed detector 9 is connected to the linear motor control circuit 8, and a speed signal from the speed detector 9 is sent to the linear motor control circuit 8. Further, a permanent magnet (not shown) is provided at a fixed portion of the linear motor 6, and when the drive coil 7 is excited by the linear motor control circuit 8, the optical head 5
The glass substrate 1 is moved in the radial direction.

The optical head 5 holds an objective lens 10 by a wire or a leaf spring (not shown).
The objective lens 10 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 12 and is movable in the tracking direction (the direction orthogonal to the optical axis of the lens) by the drive coil 11.

The laser beam generated by the laser generator 19 driven by the laser control circuit 13 is transmitted through the half prism 21 and the objective lens 10 to the glass substrate 1.
The light reflected upward from the glass substrate 1 is guided to a photodetector 24 via an objective lens 10, a half prism 21, a condenser lens 22, and a cylindrical lens 23.

As shown in FIG. 2, the laser generator 19
A semiconductor laser oscillator (or an argon-neon laser oscillator) 19a for generating laser light, a collimator lens 19b for collimating the laser light from the semiconductor laser oscillator 19a, and a laser light from the collimator lens 19b for transmitted light and reflected light. Beam splitter 1
9c, a modulator 19d that modulates the laser light transmitted through the beam splitter 19c, a modulator 19f that modulates the laser light reflected by the beam splitter 19c and guided through the mirror 19e, and transmits the laser light from the modulator 19d. In addition, it is constituted by a half prism 19h that reflects a laser beam guided from the modulator 19f via a mirror 19g.

Each of the modulators 19d and 19f selectively shields a guided laser beam according to a control signal from the laser control circuit 13, and is composed of, for example, a shutter or the like. The modulator 19d transmits laser light when a groove is generated by being modulated according to the modulation signal shown in FIG. 3C.
f is a signal which is modulated according to the modulation signal shown in FIG. 3 (b) to transmit laser light when address pits are generated.

The laser beam Ca from the modulator 19d is guided to the glass substrate 1 via the half prism 19h, the half prism 21 and the objective lens 10, and the laser beam Cb from the modulator 19f is sent to the mirror 19g and the half prism 1
9h, it is guided to the glass substrate 1 via the half prism 21 and the objective lens 10.

At this time, the mirror 19g is adjusted so that the center of the laser beam Ca coincides with the center of the groove, and the center of the laser beam Cb is shifted from the center of the groove in the radial direction of the glass substrate 1. Have been.

As a result, as shown in FIG.
The center of the laser light Ca matches the center of the groove, and the center of the laser light Cb matches the extension of the boundary between the land and the groove.

The photodetector 24 includes a four-divided photodetector cell 24.
a, 24b, 24c and 24d.
The output signal of the photodetector cell 24a of the photodetector 24 is supplied to one end of an adder 26a via an amplifier 25a, and the output signal of the photodetector cell 24b is supplied to one end of an adder 26b via an amplifier 25b. The output signal of the light detection cell 24c is supplied to the other end of the adder 26a via the amplifier 24c, and the output signal of the light detection cell 24d is supplied to the other end of the adder 26b via the amplifier 25d. It has become.

The output signal of the adder 26a is a differential amplifier OP
And the non-inverting input terminal of the differential amplifier OP2 is supplied with the output signal of the adder 26b. Thus, the differential amplifier OP supplies a signal related to the focus point to the focusing control circuit 27 according to the difference between the adders 26a and 26b. The output signal of the focusing control circuit 27 is supplied to the focusing drive coil 12, and the laser beam is controlled so that it is always just focused on the glass substrate 1.

The tracking control circuit 28 includes a CPU 30
A track drive signal is created in accordance with a control signal supplied from the D / A converter 31 through the D / A converter 31. The track drive signal output from the tracking control circuit 28 is
It is supplied to the drive coil 11 in the tracking direction.

The supply of the track drive signal to the drive coil 11 causes the objective lens 10 to gradually move and move by one track while the glass substrate 1 makes one rotation.

When the objective lens 10 is moved by the tracking control circuit 28, the linear motor control circuit 8
Moves the linear motor 6, that is, the optical head 5, so that the objective lens 10 is located near the center position in the optical head 5.

Further, a modulation circuit 14 is provided before the laser control circuit 13. The modulation circuit 14 converts the preformat data recorded in the emboss data zone of the lead-in area supplied from the memory 33 to be described later and the preformat data of the header area of each sector for each zone in the data area into 8- The data is converted (modulated) by a 16-code conversion method or the like.

The focusing device has a focusing control circuit 27 and a tracking control circuit 2 respectively.
8, a D / A converter 31 used to transfer data between the linear motor control circuit 8 and the CPU 30 is provided.

The laser control circuit 13, focusing control circuit 27, tracking control circuit 28, linear motor control circuit 8, motor control circuit 4, modulation circuit 14 and the like are controlled by a CPU 30 via a bus line 29. The CPU 30 performs a predetermined operation in accordance with a cutting start instruction from the operation panel 34 and a program stored in the memory 33.

As shown in FIGS. 4 and 5, the memory 33 stores the radial position of each zone, the number of sectors in one track of each zone,
The number of tracks in each zone, the physical sector number of each zone, and the number of revolutions of each zone are stored, and the data of the header portion preformatted in each zone of the memory area are stored.

The tracks in the embossed data zone in the lead-in area are formed by spiral grooves, and the tracks in each zone in the memory area are formed by using both grooves and lands that are switched spirally at every turn. It is a single spiral system. The rewritable data zone in the lead-in area and the track in the lead-out area may be formed by spiral grooves, or may be formed by using both the grooves and lands that are switched in a spiral in every turn. .

With the cutting device as described above,
When producing the glass master, a concave portion corresponding to the groove and the emboss data is generated while the glass substrate 1 is being rotated at a rotation speed corresponding to each zone in accordance with the structure of the optical disk 40 described later.

With the cutting device as described above,
After the photoresist on the glass substrate 1 is melted in accordance with the groove and the header portion with respect to the entire surface, the cutting process is completed, and then development and conductivity treatment are performed to produce a glass master. Using this glass master, a stamper made of nickel or the like is created by electroplating or the like.

Using this stamper, an optical disk 40 for recording and reproduction is prepared by an injection molding method or the like. Next, the structure of the optical disk 40 created above will be described.

The optical disk 40 is made of, for example, a disc-shaped substrate made of a transparent resin such as polycarbonate or acrylic having a thickness of 0.6 mm, a phase-change recording film, a reflective film, a protective film, and a sheet or adhesive for bonding. Consists of 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 to 7, the optical disc 40 has a rewritable data zone 4 and a rewritable data zone 45 in the lead-in area 42 in order from the inside.
.., 43x of the data area 43 and the data zone of the lead-out area 44, the clock signal for each zone is the same, the rotation speed (speed) of the optical disc 40 for each zone, and The number of sectors is different from each other.

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 includes 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.

The zones 43a,... 43 of the data area 43
At x, as the optical disk 40 moves from the inner circumference to the outer circumference, the rotation speed (speed 39.78 to 19.91H)
z) becomes slow, and the number of sectors per track (17 to 4)
0) increases.

Therefore, the transfer rate at the time of reproduction in each zone of the optical disc 40 is determined by the number of sectors per track in each zone and the number of revolutions of the zone. As the number of revolutions gradually decreases from a speed of 39.78 as the direction from the inner zone 43a toward the outer periphery of the optical disk 40 increases, and the number of sectors per track increases from 17 to 1, the result is shown in FIG. Thus, the transfer rate for each zone is the same (11080000 bit rate;
11, 08 Mbps).

The product of the number of revolutions for each zone and the number of sectors per track of the corresponding zone is a constant value. This constant value is a value (676.3) obtained by dividing the bit rate as the transfer rate by the number of bits per sector (2048 × 8).

That is, the bit rate is the product of the number of sectors per track and the number of user bits in one sector multiplied by the number of revolutions per zone. That is, the rotation speed (Hz) of the optical disc 40 is S, the user data bit rate (bps) is R, the number of sectors per track is N,
When the number of user bits in one sector is B, S = R / (NB).

The above zones 43a,... 43x, 44, 4
The relationship between the speed data as the number of revolutions and the number of sectors per track for the tracks 5 and 46 is the same as that shown in FIGS.
, Or in the emboss data zone 45 of the optical disc 40.

Each of the zones 43a,... 43x (zones 0 to 23) has a guide area as a buffer area on which data recording is not performed on the inner peripheral side and the outer peripheral side (boundary portion between zones). Is provided. However, no guide area is provided on the inner peripheral side of the zone 43a and the outer peripheral side of the zone 43x. Each of the zones 43a,... 43x has a recording area 24 on which data is actually recorded excluding the respective guide areas on the inner peripheral side and the outer peripheral side.
(0 to 23). Each group is composed of a user area and a spare area composed of a substitute sector for a defective sector. The spare area is provided on the outer peripheral side of the corresponding user area.

Each of the zones 43a,... 43x (zone 0)
As shown in FIG. 9, each of the constituent contents in the steps 23 to 23) is stored in a table 93 in a memory 93 of the optical disk device 61 described later.
a, or the emboss data zone 4 of the optical disc 40
5 recorded.

That is, as shown in FIG. 9, for each zone, the zone number, the number of sectors per track (per revolution), the start sector number (hex), and the sector number of the inner guard area (hex) , Group number, user area sector number (hex) and ECC block number, spare area sector number (hex) and sector number, outer guard area sector number (hex), end sector number (hex), group A start sector number and a group start sector number (hex) are recorded.

The number of sectors in one track is as follows:
7, zone 1 is 18,... Zone 23 is 40, and the number increases by one sector as going from the inner circumference to the outer circumference. The start sector number indicates the number of the first sector of the corresponding zone in hexadecimal. The sector number of the inner guard area indicates the first sector number and the last sector number of the inner guard area of the corresponding zone in hexadecimal. The group numbers are assigned the same numbers as the corresponding zone numbers. The sector number of the user area indicates the first sector number and the last sector number of the user area of the corresponding zone in hexadecimal. The number of ECC blocks indicates the number of ECC blocks in the user area of the corresponding zone in decimal. The sector number of the spare area indicates the first sector number and the last sector number of the spare area of the corresponding zone in hexadecimal. The number of sectors indicates the number of sectors in the spare area of the corresponding zone in decimal. The first sector number and the last sector number of the outer guard area of the corresponding zone are set to 1 for the sector number of the outer guard area.
Shown in hexadecimal. The end sector number indicates the number of the last sector of the corresponding zone in hexadecimal. The start sector number of the group indicates the first sector number of the actually used sector of the corresponding zone group in decimal and hexadecimal, and is consecutively numbered for each zone.

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 2K bytes of data are recorded. As shown in FIG. 10, each sector has a 4-byte (32-bit) sector ID (identification data) as address data. ) 1-I
D16 is a 2-byte error detection code (IED: I
D error detection code) along with a horizontal ECC (error correction code) 1 and a vertical ECC 2 as an error correction code for reproducing data recorded in an ECC block. It is to be recorded. This ECC
Numerals 1 and 2 are error correction codes added to data as redundant words in order to prevent data from being unable to be reproduced due to a defect of the optical disk 40.

Each sector is composed of 172 bytes of 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 40, as shown in FIG. 11, every predetermined data amount of each sector (for every predetermined data length interval, for example, 91 bytes).
A synchronization code (2 bytes: 32 channel bits) for byte synchronization when data is reproduced every byte (1456 channel bits).

As shown in FIG. 12, each sector is composed of 26 frames from the 0th frame to the 25th frame, and the synchronization code (frame synchronization signal) assigned to each frame indicates the frame number. It consists of a specific code (1 byte: 16 channel bits) for specifying and a common code (1 byte: 16 channel bits) common to each frame.

That is, as shown in FIG. 12, the 0th frame is SY0, and the second, 10th, and 18th frames are SY0.
The first, fourth, twelfth, and twentieth frames are SY2, the sixth, fourteenth, and twenty-second frames are SY3, eighth, sixteenth, and twenty-fourth frames.
The frame is SY4, the first, third, fifth, seventh, and ninth frames are SY5, the eleventh, thirteenth, fifteenth, and seventeenth frames are SY6, and the nineteenth, twenty-first, twenty-third, and twenty-fifth frames are SY7.

The zones 43a of the data area 43,...
As shown in FIG. 6, a track 43x has a header section 5 in which addresses and the like are recorded for each sector.
1,... Are pre-formatted in advance.

The header section 51 is formed when the groove is formed. This header section 51
13 and 14, a plurality of pits 52 are formed, and the groove 53 is preformatted as shown in the figure. The center of the pit 52 is a boundary line between the groove 53 and the land 54. Exist on the same line. FIG. 13 shows a header section 51 added to the head sector of each track, and FIG. 14 shows a header section 51 added to a sector in the middle of each track.

As shown in FIG. 13 and FIG.
D1 is a header part of land 1, pit string ID2 is a header part of groove 2, pit string ID3 is a header part of land 2,
The pit string ID 4 is the header part of the groove 3, the pit string ID
5 is the header portion of the land 3 and the pit row ID 6 is the groove 4
Of the header.

Therefore, the header portion for the groove and the header portion for the land are formed alternately (in a staggered manner).
The format for each sector is shown in FIG.

In FIG. 15, one sector is composed of 2697 bytes (bytes), a 128-byte header area (corresponding to the header section 51) 51, 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 40 is manufactured. This header area 51
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 composed of 46 bytes or 18 bytes, and a 36-byte or 8-byte synchronization code part 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 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 (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 "0100100000000100" is used.

Address sections PID1 to PID4 are sector addresses (including ID numbers) as 4-byte address information.
Is an area where is recorded. The sector address is a physical sector number as a physical address indicating a physical position on the track. Since this physical sector number is recorded in the mastering step, it cannot be rewritten.

The 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. Error detection code IED
Is an error (error) detection code for a sector address (including an ID number), and can 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.

Although the VFO3 area is also an area for PLL lock, it is also an area for synchronizing byte boundaries by inserting a synchronization code in the same pattern. 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 sector IDs (1 to 16) are composed of 1-byte (8-bit) sector information and a 3-byte sector number (logical sector number as a logical address indicating a logical position on a track). ing. The sector information includes a 1-bit sector format type area,
It is composed of a bit tracking method area, a 1-bit reflectivity area, a 1-bit reserved area, a 2-bit area type area, a 1-bit data type area, and a 1-bit layer number area.

The logical sector number differs from the physical sector number due to the slip replacement process due to the initial defect. The PA (postamble) 3 area 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 area is an area provided in order 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 area is an area provided for absorbing rotation fluctuation of a motor for rotating the optical disc 40 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. .

The above-described master has the same configuration as the above-described optical disk 40. Next, an optical disk system 60 that handles the optical disk 40 will be described. An optical disk system 60 shown in FIG. 16 uses an optical disk (DVD-RAM) 40 as a recording medium to record data (information) using focused light or to reproduce data recorded on the optical disk 40. Device 61;
An optical disk control device 62 is provided as an external device for instructing the optical disk device 61 to perform recording and reproduction.

In FIG. 16, the optical disk 4
0 is rotated by the motor 63 at a different rotation speed for each zone, for example. The motor 63 is controlled by a motor control circuit 64.

The recording of data on the optical disk 40 or the reproduction of data recorded on the optical disk 40 is performed by the optical head 65. The optical head 65 is fixed to a drive coil 67 constituting a movable portion of a linear motor 66, and the drive coil 67 is connected to a linear motor control circuit 68.

A speed detector 69 is connected to the linear motor control circuit 68, and sends a speed signal of the optical head 65 to the linear motor control circuit 68. Further, a permanent magnet (not shown) is provided at a fixed portion of the linear motor 66, and the drive coil 67 is excited by the linear motor control circuit 68,
The optical head 65 is moved in the radial direction of the optical disc 40.

The optical head 65 has an objective lens 70
Are supported by a wire or a leaf spring (not shown), and the objective lens 70 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 71.
The drive coil 72 can move in the tracking direction (the direction orthogonal to the optical axis of the lens).

The semiconductor laser oscillator 79 is driven by the laser control circuit 73 to generate a laser beam. The laser control circuit 73 corrects the amount of laser light from the semiconductor laser oscillator 79 in accordance with the monitor current from the photodiode PD for monitoring the semiconductor laser oscillator 79.

The laser control circuit 73 includes a PLL (not shown)
It operates in synchronization with a recording clock signal from a circuit. This 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 79 driven by the laser control circuit 73 is irradiated onto the optical disk 40 via the collimator lens 80, the half prism 81, and the objective lens 70, and is emitted from the optical disk 40. Is guided to a photodetector 84 via an objective lens 70, a half prism 81, a condenser lens 82, and a cylindrical lens 83.

The photodetector 84 is constituted by four divided photodetection cells 84a, 84b, 84c and 84d. The output signal of the photo detector cell 84a of the photo detector 84 is supplied to one end of an adder 86a via an amplifier 85a, and the output signal of the photo detector cell 84b is supplied to one end of an adder 86b via an amplifier 85b. And the light detection cell 84c
Is supplied to the other end of the adder 86a via the amplifier 85c, and the output signal of the light sensing cell 84d is supplied to the other end of the adder 86b via the amplifier 85d.

The output signal of the photodetector cell 84a of the photodetector 84 is supplied to one end of an adder 86c via an amplifier 85a, and the output signal of the photodetector cell 84b is supplied to an amplifier 85a.
b to one end of an adder 86d, and the output signal of the light-sensing cell 84c is supplied to the adder 86d via an amplifier 85c.
d, the output signal of the light detection cell 84d is
The signal is supplied to the other end of the adder 86c via the amplifier 85d.

The output signal of the adder 86a is supplied to the inverting input terminal of the differential amplifier OP2.
Is supplied with the output signal of the adder 86b. Accordingly, the differential amplifier OP2 outputs a signal (focus error signal) related to the focus point according to the difference between the adders 86a and 86b.
To be supplied. The output signal of the focusing control circuit 87 is
And the laser light is controlled so that it is always just focused on the optical disk 40.

The output signal of the adder 86c is supplied to the inverting input terminal of the differential amplifier OP1.
Is supplied with the output signal of the adder 86d. Thus, the differential amplifier OP1 supplies a tracking error signal to the tracking control circuit 88 according to the difference between the adders 86c and 86d.
The tracking control circuit 88 creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 88 is supplied to the drive coil 72 in the tracking direction. The tracking error signal used in the tracking control circuit 88 is supplied to the linear motor control circuit 68.

Each light detecting cell 84 of the light detector 84 in the state where focusing and tracking are performed as described above.
a, the sum signal of the outputs of ８４84d, that is, the adders 86c, 8
The signal obtained by adding the output signal from 6d by the adder 86e is
The change in reflectivity from pits (recording data) formed on the track is reflected. This signal is supplied to a data reproducing circuit 78, where the recorded data is reproduced.

The reproduced data reproduced by the data reproducing circuit 78 is subjected to error correction by an error correcting circuit 92 using the applied error correction code ECC, and thereafter, an optical disk as an external device is transmitted via an interface circuit 95. Output to the control device 62.

Further, when the objective lens 70 is being moved by the tracking control circuit 88, the linear motor control circuit 68 controls the linear motor 66, that is, the optical motor so that the objective lens 70 is positioned near the center position in the optical head 65. The head 65 is moved.

Further, a data generation circuit 74 is provided at a stage preceding the laser control circuit 73. 10 supplied from the error correction circuit 92 to the data generation circuit 74.
As shown in FIG. 11, an ECC block data generation circuit 74a for converting ECC block format data as recording data into recording ECC block format data to which an ECC block synchronization code is added as shown in FIG. And a modulation circuit 74b for modulating the recording data from the ECC block data generation circuit 74a by the 8-16 code conversion method.

The data generation circuit 74 is supplied with record data to which an error correction code has been added by the error correction circuit 92 and dummy data for error checking read from the memory 10. Error correction circuit 92
Is supplied with recording data from an optical disk control device 62 as an external device via an interface circuit 95 and a bus 89.

The error correction circuit 92 converts the 32 Kbytes of recording data supplied from the optical disc control device 62 to 2K 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 as shown in FIG. 10 is generated.

The optical disk device 61 has a focusing control circuit 87, a tracking control circuit 88, a linear motor control circuit 68, and a D which is used for exchanging information between the CPU 90 for controlling the entire optical disk device. A / A converter 91 is provided.

The motor control circuit 64, linear motor control circuit 68, laser control circuit 73, data reproduction circuit 7
8, a focusing control circuit 87, a tracking control circuit 88, an error correction circuit 93, etc.
This is controlled by the PU 90.
The PU 90 performs a predetermined operation according to a control program recorded in the memory 93.

The memory 93 stores a control program and is used for data recording. This memory 93 stores the above-mentioned zones 43a,.
Table 93a in which the speed data as the number of rotations and the number of sectors for each track are recorded for Nos. 5 and 46.
have.

The tracking control circuit 88 is provided by the
As shown in FIG.
2, a phase compensation circuit 103 and a drive circuit 104.

The changeover switch 101 is switched by a tracking polarity switching signal (land / groove switching signal) from the CPU 90. When the polarity of the tracking polarity switching signal is a groove, the tracking error signal from the differential amplifier OP1 is transmitted. When the tracking polarity switching signal is output to the phase compensation circuit 103 and the polarity of the tracking polarity switching signal is a land, the track error signal whose polarity has been inverted by the polarity inversion circuit 102 is output to the phase compensation circuit 103.

The polarity inversion circuit 103 includes a differential amplifier OP1
The polarity of the track error signal supplied from the inverter is inverted (opposite phase), and the output is supplied to the changeover switch 102.

The phase compensating circuit 103 includes the changeover switch 10
1 compensates the phase of the positive (positive phase) track error signal or the reverse polarity (negative phase) track error signal supplied from 1 and outputs it to the drive circuit 104.

The drive circuit 104 moves the objective lens 70 in the tracking direction by driving the drive coil 71 according to the track drive signal from the phase compensation circuit 103.

The track error signal is shown in FIG.
As shown in (b), the position of the laser beam changes with respect to the groove and the land. That is, when the position of the laser beam is located at the center of the groove or land, the track error signal is 0.
And the difference increases as the distance from the center increases.

Next, the mechanism of the optical disk device 61 for realizing the zone CLV will be described. The optical head 65 mounted on the optical disk device 61 has a home position, and is controlled so that the optical head 65 always comes to this position when power is turned on. The home position is designed so that the radius position is mechanically set to a predetermined value, and the CPU 90 knows what zone the home position corresponds to.
Adjust the number of rotations to zero. At this position, the position of the header section 51, that is, the address is confirmed (the sector address at the current position is read). To seek to a certain sector, a distance is calculated from the address of the seek destination sector and the current address, and a linear motor 67 as a coarse movement mechanism of the optical head 65 is driven. The number of rotations of the optical disk 40 is determined by referring to the table 93a from the address of the sector to which the seek operation is performed, and the zone number and the number of rotations are determined.

After that, the linear motor 6 of the optical head 65
7 is moved, the moving position is confirmed by reading the header 51. The difference between the moved position and the target sector of the seek destination is calculated, and the track jump of the difference is performed using the tracking control circuit 88 to move to the target sector.

Next, a description will be given of a process when a moving image is recorded across the zones of the optical disc 40 in the above configuration. For example, a process for recording (writing) from a predetermined ECC block (zone 0) will now be described.

For example, an instruction to record (write) data from a predetermined ECC block (zone 0) in the data area 43 of the optical disk 40 and data to be recorded are transmitted from the optical disk control device 62 via the interface circuit 95. It is supplied into the optical disk device 61. Thus, an instruction to record data from a predetermined ECC block is supplied to the CPU 90, and the recording data is stored in the memory 93.

Thus, the CPU 90 determines the recording from the first sector of the ECC block, and the address including the track number and the sector number corresponding to the first sector and the rotation corresponding to the zone 0 including the first sector. The number (39.78 Hz) is determined based on the contents stored in the table 93a of the memory 93.

In response to this determination, the CPU 90 rotates the optical disk 40 at a rotation speed (39.78 Hz) corresponding to the zone 0 including the ECC block to be recorded, and sets the irradiation position of the laser beam by the optical head 65 to the address. The access processing for moving to the position corresponding to is performed.

After this access processing is performed, the CPU 9
0 is the recording data, and a new correction code is added to generate recording data of the first ECC block and record it on the optical disc 1.

Thereafter, data is recorded on consecutive ECC blocks in the same zone supplied from the optical disk control circuit 62. Then, after recording of data in the last ECC block of the user area in zone 0 is completed,
The CPU 90 determines the shift to the zone 1, reads the rotation speed (37.57 Hz) corresponding to the zone 1 from the table 93a of the memory 93, and changes the rotation of the optical disc 40 to this rotation speed. Until the rotation speed is changed and stabilized, the laser light from the optical head 65 is applied to the guard area of zone 0 (outer periphery) and the guard area of zone 1 (inner periphery).
Each track is traced. For this reason, the rotation fluctuation can be absorbed.

As a result, data is recorded sequentially from the first ECC block in the user area of zone 1. When data is recorded over the above zones, a constant transfer rate can be secured over the entire surface of the optical disk due to the relationship between the rotation speed of the optical disk 40 and the number of sectors per track as described above.

Next, a process when a moving image recorded over a zone of the optical disc 40 is reproduced will be described. For example, a process for reproducing (reading) from a predetermined ECC block (zone 0) will now be described.

For example, an instruction to reproduce (read) data from a predetermined ECC block (zone 0) in the data area 43 of the optical disk 40 is issued by the optical disk control device 6.
2 is supplied to the CPU 90 in the optical disk device 61 via the interface circuit 95. Thereby, the CP
The U90 judges the reproduction from the head sector of the ECC block, and the rotation speed (39.78 Hz) corresponding to the zone 0 including the head sector, together with the address consisting of the track number and the sector number corresponding to the head sector.
Is determined based on the contents stored in the table 93a of the memory 93.

In accordance with this determination, the CPU 90 rotates the optical disk 40 at a rotation speed (39.78 Hz) corresponding to zone 0 including the ECC block to be recorded, and sets the irradiation position of the laser beam by the optical head 65 to the address. The access processing for moving to the position corresponding to is performed.

After the access processing is performed, the CPU 9
0 outputs to the error correction circuit 92 data for each sector area in ECC block units demodulated by a demodulation circuit (not shown) in the data reproduction circuit 78. This allows
Data for one ECC block is supplied to the error correction circuit 92, and error correction is performed using ECC1 and ECC2.

When it is determined that the correction by the error correction process has been completed normally, the CPU 90 outputs the reproduced data of the reproduced ECC block to the optical disk control circuit 62 via the interface circuit 95 as a reproduced result.

Thereafter, reproduction data of successive ECC blocks in the same zone is output to the optical disk control circuit 62. Then, after the reproduction data of the last ECC block in the user area in zone 0 is output to the optical disk control circuit 62, the CPU 90 determines the shift to zone 1, and determines the rotation speed (37.57 Hz) corresponding to zone 1 Memory 93
Is read from the table 93a, and the rotation of the optical disk 40 is changed to this number of rotations. Until the rotation speed is changed and stabilized, the laser light from the optical head 65 traces the tracks in the guard area of zone 0 (outer side) and the guard area of zone 1 (inner side). For this reason, the rotation fluctuation can be absorbed.

As a result, the reproduced data of the first ECC block in the user area in zone 1 is sequentially output to the optical disk control circuit 62. At the time of reproduction over the above zone, the rotation speed of the optical disc 40 and the
Due to the relationship with the number of sectors per track, the transfer rate of the reproduction data can be made the same without lowering the transfer speed, and the moving image can be reproduced without adding a special circuit.

As described above, by configuring the optical disc, it is possible to make the transfer rate substantially constant on the optical disc. That is, a constant user data bit rate can be secured over the entire surface of the optical disk, and recording and reproduction of serial data such as moving images can be performed.

[0122]

As described in detail above, according to the present invention, the same transfer rate can be secured without slowing down the transfer rate, and recording and reproduction of data such as moving images can be performed without adding a special circuit. It is an object of the present invention to provide an optical disk, an optical disk master manufacturing apparatus, and an optical disk apparatus capable of performing the optical disk.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cutting device for explaining an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a laser generator.

FIG. 3 is a diagram for explaining generation of a groove, generation of an address pit, and a modulation signal.

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

FIG. 5 is a diagram for explaining a rotation speed and the like of each zone of the optical disc.

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

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

FIG. 8 is a diagram for explaining a transfer rate calculated based on the number of rotations for each zone of the data area of the optical disc and the number of sectors per track.

FIG. 9 is a diagram for explaining the configuration of each zone of the data area of the optical disc.

FIG. 10 is a diagram for explaining a configuration of an ECC block of the optical disc.

FIG. 11 is a diagram for explaining a configuration of an ECC block of the optical disc.

FIG. 12 is a diagram for explaining the configuration of each sector of an ECC block.

FIG. 13 is a view for explaining preformat data in a header portion of the optical disc.

FIG. 14 is a view for explaining preformat data in a header portion of the optical disc.

FIG. 15 is a diagram showing a sector format of an ECC block.

FIG. 16 is a block diagram showing a schematic configuration of an optical disk system.

FIG. 17 is a block diagram showing a schematic configuration of a tracking control circuit.

FIG. 18 is a diagram for explaining signal waveforms of main parts of the tracking control circuit. Figure.

[Explanation of symbols]

 40 optical disk 60 optical disk system 61 optical disk device 62 optical disk controller 63 motor 78 data reproduction circuit 90 CPU 92 error correction circuit 93 memory

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 19/02 501 G11B 19/02 501B 19/28 19/28 B

Claims (9)

[Claims] 1. A spiral or concentric track on which data is recorded, the track being composed of grooves and lands in one turn, comprising a plurality of zones of a plurality of tracks. A plurality of continuous sector areas each having a predetermined track length and including an address area in which address data indicating a position on the track is recorded and a recording area in which recording data is recorded; A format is defined in which the number of sector areas per track is increased by one each time the zone moves from the zone on the outer side to the zone on the outer side, and comprises a set of a predetermined number of sector areas among a plurality of sector areas. Error correction data for reproducing the recording data recorded in these predetermined number of sector areas In an optical disc in which recording is performed in units of block areas including an error correction data recording area which is collectively recorded, and which is rotated at a rotational speed that gradually decreases as the zone moves from the inner zone to the outer zone, each zone An optical disc characterized in that the product of the number of rotations per sector and the number of sector areas per track in each zone corresponding to each zone is a constant value. 2. The optical disk according to claim 1, wherein the number of tracks in each zone is a multiple of the number of sector areas in one block area. 3. In each zone, data provided at a boundary between a user area in which user data is recorded, a spare area serving as a replacement sector area for a defective sector area of the user area, and an inner zone are not recorded. 2. The optical disk according to claim 1, comprising a second guard area on the boundary between the first guard area and the zone on the outer peripheral side, on which no data is recorded. 4. It has a spiral or concentric track on which data is recorded, and this track consists of grooves and lands in one turn, and a plurality of zones of a plurality of tracks. A plurality of continuous sector areas each having a predetermined track length and including an address area in which address data indicating a position on the track is recorded and a recording area in which recording data is recorded; A format is defined in which the number of sector areas per track is increased by one each time the zone moves from the zone on the outer side to the zone on the outer side, and comprises a set of a predetermined number of sector areas among a plurality of sector areas. Error correction data for reproducing the recording data recorded in these predetermined number of sector areas Production of master discs for optical discs in which recording is performed in units of block areas including the error correction data recording area that is recorded collectively, and that is rotated at a slower speed as the zone moves from the inner zone to the outer zone. An apparatus for manufacturing a master for optical disks, characterized in that the master for manufacturing a master in which the product of the number of rotations for each zone and the number of sector areas per track for each zone is a constant value. 5. The optical disk master manufacturing apparatus according to claim 4, wherein the number of tracks in each zone is a multiple of the number of sector areas in one block area. 6. In each zone, data provided at a boundary between a user area in which user data is recorded, a spare area serving as a substitute sector area for a defective sector area of the user area, and an inner zone are not recorded. 2. The optical disc master manufacturing apparatus according to claim 1, comprising a first guard area and a second guard area provided at a boundary between the zone on the outer peripheral side and on which no data is recorded. 7. It has a spiral or concentric track on which data is recorded, and this track consists of grooves and lands in one turn, and a plurality of zones of a plurality of tracks. A plurality of continuous sector areas each having a predetermined track length and including an address area in which address data indicating a position on the track is recorded and a recording area in which recording data is recorded; A format is defined in which the number of sector areas per track is increased by one each time the zone is shifted from the zone on the outer side to the zone on the outer side, and is composed of a set of a predetermined number of sector areas among a plurality of sector areas. Error correction data for reproducing the recording data recorded in these predetermined number of sector areas For an optical disc on which recording is performed in units of a block area including an error correction data recording area which is collectively recorded, the rotation speed is gradually decreased each time the optical disc moves from an inner zone to an outer zone. In a rotating state,
In an optical disc apparatus for recording data or reproducing recorded data, the product of the number of rotations for each zone and the number of sector areas per track corresponding to each zone is a constant value. Optical disk device. 8. The optical disk apparatus according to claim 1, wherein the number of tracks in each zone of the optical disk is a multiple of the number of sector areas in one block area. 9. Each of the zones of the optical disk is a data area provided at a boundary between a user area in which user data is recorded, a spare area serving as a substitute sector area for a defective sector area of the user area, and an inner zone. 2. The optical disk apparatus according to claim 1, comprising a first guard area where no data is recorded and a second guard area where data is not provided and is provided at a boundary between the zone on the outer peripheral side.