JP2000021025A - Optical disk and optical disk device - Google Patents

Abstract

(57) [Summary] [Problem] To provide an optical disk and an optical disk device capable of increasing format efficiency and recording data at an arbitrary position without waste. An optical disc capable of recording and reproducing data using land tracks and groove tracks provided alternately and adjacently.
A land portion 15 provided by dividing the groove track 13; and an emboss pit 21 formed on the boundary between the land track 13 and the land portion 15 located on both sides of the groove track 14 provided with the land portion 15. An area 23 adjacent to the land portion 15 on the land track 13 on the side where the emboss pit 21 is not formed is an optical disk which is a recording / reproduction interruption area where data is not recorded and reproduced, and the recording / reproduction interruption area An optical disk device that temporarily suspends data recording or playback within the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk capable of recording and reproducing data and an optical disk drive for driving the optical disk.

[0002]

2. Description of the Related Art In a rewritable optical disk capable of repeatedly recording data at an arbitrary position on a disk and reproducing data at an arbitrary position, data is generally recorded in sector units. In this case, sector address information and error-correction-encoded data are recorded in each sector.

On the other hand, a recently standardized 120 mm
In a large-capacity rewritable optical disk called a DVD-RAM having a large diameter, in order to improve the error correction capability of data, data obtained by performing error correction coding over a plurality of sectors instead of a sector unit is used. Correction block (ECC
Data is recorded in block) units. The same applies to a DVD-ROM which is a read-only optical disk, in which data is recorded in units of error correction blocks consisting of 16 sectors including 2048 bytes of data per sector. In the DVD-ROM, the error correction coding is applied to the address information of the error correction block and the sector in the same manner as the data, so that the structure is extremely resistant to errors.

In a DVD-RAM, address information in sector units is recorded in advance as emboss pits on a disk, and a plurality of sectors (16 sectors) generate one error correction block when data is recorded. In this case, address information is always obtained in sector units. Therefore, even if the optical head moves to an adjacent track by mistake during recording, for example, the damage of erroneous recording is only one sector and the seek time is shortened. is there. Further, since a periodic signal corresponding to the cycle of the sector can always be obtained from the address information of the sector during recording and reproduction, it is possible to control the spindle motor for rotating the optical disk according to the periodic signal.

In the conventional method of recording address information on a sector-by-sector basis as in a DVD-RAM, in addition to the address information area (header field) in each sector, the rotation of the disk during data recording and reproduction is performed. A buffer area for responding to the actual sector length change on the disk caused by speed fluctuations and eccentricity, a buffer area for responding to random shift of the recording position when using the phase change recording method and start / end deterioration, etc. The area other than the area for recording the original data increases, which causes the format efficiency to decrease. For this reason,
In order to secure a sufficient recording capacity, it is necessary to increase the recording density by that much, and if the recording density is kept constant, there is a problem that the recording capacity is reduced by that much.

On the other hand, as a method for recording data without forming address information in sector units on an optical disc,
For example, as employed in CD-R, CD-RW, etc., a method of wobbling a groove on an optical disk to record address information as an FM signal, and recording data in error correction block units based on this. There is. In this case, since the address of the error correction block is determined only after data is recorded, it is generally difficult to record data at an arbitrary position without waste. Also, since the address information of the error correction block and the address information of the sector cannot be taken out without solving the error correction, even if the address is lost during recording, it cannot be dealt with, and the data is recorded at the wrong address. Could be done. In addition, address information recorded in the form of a groove wobble deteriorates during many times of writing. Further, in an area where data is written, a periodic signal of a sector cycle necessary for controlling the spindle motor is obtained from the optical disk, but in an area where data is not written, such a periodic signal may be obtained. Can not. For this reason, after data is written, finalization for recording a dummy signal for generating a periodic signal on a plurality of tracks is required, and extra recording time is required.

[0007]

As described above, among the conventional rewritable optical disks, in an optical disk in which address information in sector units is recorded as pre-pits, fluctuations in the rotational speed of the disk and the rotational speed of the sector are determined for each sector. The original data is recorded because it is necessary to provide a buffer area to cope with the actual change in the sector length caused by eccentricity and the like, and the random shift of the recording position and the deterioration of the start and end when the phase change recording method is used. In addition, the area other than the area for the increase increases, causing the format efficiency to decrease.

On the other hand, in an optical disk in which address information is recorded by wobbling a groove and data is recorded in units of error correction blocks, it is not only difficult to record data at an arbitrary position without waste. It is not possible to obtain address information in sector units without solving the error correction, and furthermore, a finalization process for generating a periodic signal for controlling the spindle motor is required, and it takes a long time to record. Was.

Therefore, the present invention provides an optical disk and an optical disk apparatus which can increase the format efficiency, can record data at an arbitrary position without waste, and do not require an extra finalization process. Is to do.

[0010]

According to the present invention, land tracks and groove tracks are alternately provided adjacent to each other, and a plurality of land tracks and groove tracks are provided by using at least one of these land tracks and groove tracks. In an optical disc capable of recording and reproducing data in units of error correction blocks composed of sectors, a land provided by dividing the groove track;
The land track is provided on either side of a groove track provided with the land and an emboss pit formed on one of boundaries of the land, and the land is located on a side where the emboss pit is not formed. The area adjacent to the land on the track is a recording / reproduction interrupted area where data recording and reproduction are not performed, and the area adjacent to the land track located on the side where the embossed pit is formed. An optical disk characterized in that a region on the groove track facing the land portion across the land track is also a recording / reproduction interrupted region where data recording and reproduction are not performed.

Here, the emboss pit may be formed for each of the error correction blocks, and may record position information of the error correction block. Further, the error correction block may be divided into a plurality of blocks, and the recording / reproduction interruption area may be formed between the plurality of blocks.

Further, a buffer area may be provided in each of the plurality of divided blocks. The logical position at which the error correction block is divided into a plurality of blocks is immediately before a synchronization pattern in a data area, immediately before sector address information, or immediately after sector address information. Or the optical disc according to any one of 5.

Further, according to the present invention, at least one of a land track and a groove track on an optical disk is
In an optical disc device for recording or reproducing data in units of error correction blocks composed of a plurality of sectors, an emboss pit provided on a boundary between a land portion provided by dividing the groove track of the optical disc and the land track is used. Based on the obtained position information, when recording or reproducing the data of each sector and the address information of the sector, the logical position information where the error correction block is divided based on the position information and the divided Generate a recording / playback interruption area inserted between blocks,
An optical disc device is provided, wherein recording or reproduction of data is temporarily suspended in the recording / reproduction suspension area.

Here, when generating the logical position information in which the error correction block is divided into a plurality of blocks,
The logical position where the error correction block is divided may be immediately before the synchronization pattern in the data area, immediately before the sector address information, or immediately after the sector address information.

As described above, the position information and the like of the error correction block are recorded as emboss pits on the optical disc,
When recording data of each sector of the error correction block and address information of the sector based on the position information, a logical position at which the error correction block is divided into a plurality of blocks from the position information of the error correction block. By generating a recording / reproduction interruption area inserted between information and the plurality of divided blocks and temporarily suspending recording in the recording / reproduction interruption area, rotation of the disk during data recording / reproduction is performed. The buffer area is divided into multiple blocks to cope with changes in the actual sector length on the disk caused by speed fluctuations and eccentricity, and random shifts in the recording position and degradation in the start and end when using the phase change recording method. That is, the error correction block may be provided for each block. In addition, since data is not recorded and reproduced on tracks adjacent to the track where embossed pits are present, the format efficiency is improved over conventional rewritable optical discs without crosstalk and problems with data recording and reproduction characteristics. It is possible to do.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. As a method for solving the above-mentioned problem, an optical disk as described below and an optical disk device for driving the same have been proposed. This is an optical disc that records and reproduces data in units of error correction blocks composed of a plurality of sectors using at least one of a land track and a groove track. Position information of the error correction block (information of the address of the error correction block or information indicating the boundary of the error correction block) is recorded as an emboss pit on the boundary, and the error correction block is determined based on the position information obtained from the emboss pit. The error-correction-coded data is written in each of the sectors, and sector address information indicating the address of the sector in which the data is to be written is written (see FIGS. 1, 2).
(See FIG. 4).

As described above, the position information of the error correction block is recorded as emboss pits on the optical disc,
If the data of each sector of the error correction block and the address information of the sector are recorded on the basis of this position information, the actual sector on the disk caused by the rotation speed fluctuation and the eccentricity of the disk at the time of recording and reproducing the data. A buffer area for coping with a length change or a random shift of a recording position and deterioration of the start and end when the phase change recording method is used may be provided for each error correction block. In other words, the buffer area is smaller than that of a conventional optical disk that records address information in sector units as embossed pits, so it is possible to increase the area for recording original data by that much, and to improve the format efficiency. Can be done.

However, in the above-described configuration, the buffer area is provided in units of error correction blocks, and since recording is performed in units of error correction blocks, the land portions provided with emboss pits must be aligned in the disk radial direction. Therefore, normal data recording and reproduction are performed on a track adjacent to the track having the embossed pit. Therefore, when the recording density in the track direction increases (when the track pitch is reduced), crosstalk between the embossed pits and the recording data on the adjacent track may become a problem. In particular, when a land track adjacent to a land portion provided with embossed pits is reproduced, a crosstalk suppression effect of a land / groove configuration cannot be obtained, and there is a concern about influence on data reproduction.

In the land track adjacent to the land portion where the embossed pit is provided, one side has a groove, but the other side is flat in a land state, and the recording and reproduction characteristics have the groove on both sides. Unlike the position, it is conceivable that a problem occurs in the recording and reproduction itself, such as formation of a desired recording mark or a large change in the DC component of the reproduction signal.

Therefore, in the present invention, further improvements are made to the above-described optical disc. First, an optical disc according to an embodiment of the present invention will be described. 1 is an enlarged perspective view showing a part of the optical disk, FIG. 2 is a plan view showing a track pattern on the optical disk, and FIG.
(A), (b) is a conceptual diagram showing a spiral format on an optical disk.

As shown in FIG. 1, the optical disk 10 of the present embodiment is formed by forming a recordable / reproducible recording film 12, for example, a phase change film on a disk substrate 11. As shown in FIGS. 1 to 3, land tracks 13 and groove tracks 14 are formed in a spiral shape on the disk substrate 11, and are provided so that both tracks are alternately adjacent to each other in the disk radial direction. As a method of arranging the land track 13 and the groove track 14, a double spiral method in which the land track 13 and the groove track 14 are arranged on two parallel spirals shown in FIG. There is a single spiral system in which the land track 13 and the groove track 14 are continuously arranged spirally as shown. In the present embodiment, the double spiral system shown in FIG.

In this embodiment, the land tracks 13 and the groove tracks 14 are used as shown in FIG.
Are wobbled by a wobble pattern having a constant period. FIGS. 1 and 3 show diagrams without wobbling for simplicity.

As shown in FIGS. 1 and 2, the groove track 14 is divided on the way, and the divided area is a land 15. The emboss pit 16 is located on the boundary between the land 15 and the land track 13.
Are formed. Here, the emboss pits 16 are formed on either one of the boundaries between the land tracks 14 located on both sides of the groove track 14 where the land portions 15 are provided and the land portions 15. This emboss pit 1
6 is an error correction block (hereinafter referred to as E) in the land track 13 and the groove track 14 located on both sides thereof.
This is for giving position information and the like of a CC block. Specifically, the address of the ECC block or E
It indicates the boundary information of the CC block, and is formed with a cycle of the ECC block length.

Further, as shown in FIG. 2, the land track 13 located on the side where the emboss pit 21 is not formed is provided.
An area 23 adjacent to the upper land 15 is a recording / reproduction interrupted area where data recording and reproduction are not performed. Further, the groove track 13 adjacent to the land track 14 located on the side where the emboss pit 22 is formed
The area 24 facing the land section 15 with the land track 14 therebetween is also a recording / reproduction interrupted area where data recording and reproduction are not performed.

That is, one ECC formed on the optical disc
The recording / reproducing area of the block includes a recording / reproducing suspended area for dividing the ECC block. If the recording format is determined, logical position information for dividing the ECC block into two blocks is generated from the position information of the error correction block.

The emboss pits 16, 21, and 22 shown in FIGS. 1 and 2 consist of a set of a plurality of pits. Although a circular pit is shown in the figure, the shape of the pit is not limited to this, and may be an ellipse, an ellipse, or a combination thereof.

As described above, the emboss pit 16 indicating the position information of the ECC block is formed for each ECC block, and the recording or reproduction is temporarily stopped in the areas 23 and 24 in the figure, so that the format efficiency will be described later in detail. , The problems relating to crosstalk and data recording / reproduction can be solved.

Further, the emboss pits 16, 21, 22 are provided on the boundary between the land portion 15 separating the groove track 14 and the land track 13 adjacent either inside or outside in the disk radial direction. The position information of the ECC block given by the pit 16 is shared by both the land track 13 and the groove track 14 located on both sides thereof.

As described above, the optical disk 10 is replaced with the current DVD.
-Even if the track pitch is narrowed to achieve a higher density than that of the RAM, the recording marks are not present in the track areas 23 and 24 adjacent to the track where the embossed pits 21 and 22 are present, so that crosstalk is affected. Signal from embossed pits 21 and 22 without sufficient SNR
Can be detected. And embossed pit 2
Since there is no data to be reproduced in the areas 23 and 24 on the tracks adjacent to the track where the tracks 1 and 22 are present, there is no need to consider crosstalk from the embossed pits 21 and 22.

Also, in the area 23 on the land track 13, the adjacent groove exists only on one side, and it is considered that the recording and reproduction characteristics are different from the case where the groove exists on both sides. Although there is a possibility that the recording / reproduction itself is not performed in the area 23 in the present invention, it is not necessary to consider such difficulty. Although not explicitly shown in the drawing, all other areas on the optical disk naturally have the same configuration as described above.

When the regulation on crosstalk is somewhat relaxed in accordance with the recording density (or track pitch) in the track direction, the recording / reproduction interruption area 2 shown in FIG.
Only one may be provided, and recording and reproduction may be performed in the recording / reproduction suspended area 24 as usual. According to this configuration, at least in the area 23 on the land track 13, the adjacent groove exists only on one side, and the problem caused by the difference in recording and reproduction characteristics from the case where the groove exists on both sides is solved. .

Next, the optical disk 1 described above with reference to FIG.
An optical disk device that drives data 0 to record and reproduce data will be described. In FIG. 4, an optical disk 10 has a spindle motor 5 driven by a motor driver 500.
01, and recording and reproduction are performed by an optical head 502 provided to face the optical disk 10. The optical head 502 includes a laser diode (LD) 503 as a light source, and the laser diode 503.
A collimator lens 504 for converting a light beam emitted from the optical disk into parallel light, a beam splitter 505 for separating incident light to the optical disk 10 and reflected light from the optical disk 10, and a light beam passing through the beam splitter 505. An objective lens 506 for condensing and irradiating the optical disc 10 with a minute light beam spot; a condensing lens 507 for condensing the reflected light reflected by the optical disc 10 and guided by the beam splitter 505; And a lens actuator 509 for moving the objective lens 506 in the optical axis direction (focus direction) and the tracking direction. However, it goes without saying that the configuration of the optical head 502 is not limited to the illustrated one.

As the photodetector 508, a multi-segment detector in which a detection area is divided into a plurality of, for example, four areas is used. The plurality of output signals output from the photodetector 508 are input to the analog operation circuit 513. Analog operation circuit 5
Reference numeral 13 generates a reproduction signal corresponding to data recorded on the optical disk 10, a focus error signal and a tracking error signal for focus servo and tracking servo, and a speed control signal for controlling a rotation speed of the spindle motor 501. I do. The focus servo is control for making the focus of the objective lens 506 coincide with the recording surface on the optical disk 10, and the tracking servo is control for causing the light beam irradiated on the optical disk 10 to follow the track.

The focus error signal and the tracking error signal are input to a servo circuit 510, and the lens actuator 50 is controlled by the servo circuit 510.
9 controls the objective lens 506 in the focus direction and the tracking direction. Also, the servo circuit 510
Is a motor driver 5 according to a speed control signal generated based on a periodic signal described later obtained from the optical disc 10.
00 is controlled.

(Recording Operation) Next, an outline of the recording operation will be described. At the time of recording, a recording data sequence Din, which is data to be recorded, is processed by the recording data processing unit 511 and then input to the LD driver 512, where the laser diode 503 is intensity-modulated by the LD driver 512. The light beam whose intensity has been modulated in this manner is applied to a collimator lens 504, a beam splitter 505, and an objective lens 5.
06 on the optical disc 10 through
Data is recorded on the recording film 12 of the optical disk 10 as a recording mark, for example, a phase change mark from crystalline to amorphous or from amorphous to crystalline.

At the time of recording, the reflected light from the optical disk 10 enters the photodetector 508 via the objective lens 506, the beam splitter 505, and the condenser lens 507, and the output of the photodetector 508 is used as an analog operation circuit. 51
3, the embossed pit 16 on the optical disc 10
(Hereinafter referred to as an emboss pit signal) and a periodic signal whose amplitude changes in accordance with a wobble pattern of a land track and a groove track on the optical disk 10.

Then, the timing extraction circuit 514 generates position information of the ECC block indicated by the emboss pit 16 according to the emboss pit signal, and further generates a speed control signal according to the periodic signal. The speed control signal is input to the servo circuit 510, and the servo circuit 510 controls the spindle motor 501 to a predetermined rotation speed via the motor driver 500 based on the speed control signal. The position information of the ECC block is stored in the recording data processing unit 5.
11 is used to generate an ECC block and further to generate sector address information.

The position information of the ECC block is input to the CPU 518 via the controller 517, and the logical position information and the 2nd position where the ECC block is divided into two blocks.
A recording / reproduction interruption area between the blocks is generated. Here, the recording / reproducing interruption area is generated on a track adjacent to a track on which an embossed pit exists on the optical disk, at a position adjacent to or opposed to a land portion where the embossed pit is provided (see FIG. 2). Controller 517
Executes a control to temporarily stop recording in the recording / reproduction interruption area during the recording operation.

At the time of this recording, a focus error signal and a tracking error signal are further generated by the analog arithmetic circuit 513, and the lens actuator 509 is generated by the servo circuit 510 based on these signals.
Is controlled, focus servo and tracking servo are performed.

The procedure of the recording operation will be described below in detail with reference to FIG. First, a recording data sequence Din is input (step S101). Next, a data frame as shown in FIG. 6 is generated from the input recording data sequence Din. After dividing the recording data sequence Din into data sectors in units of 2048 bytes, 178 × 1
It is assumed to be a 2-byte data frame. As shown in the figure, the data frame is composed of 2064 bytes arranged in a 12-row array with 172 bytes as one row.
The first line is 4-byte data identification data (data ID)
And 2 for detecting an error occurring in the data ID.
Byte ID error detection code (IED), 6-byte spare byte (RSV), and 160-byte main data D0 to
D159. Main data is an element of a data sector. The second to eleventh rows are each 172
Byte main data D160 to D331, D332 to D503,.
.., D1708 to D1879, and the last 12th row is composed of 168-byte main data D1880 to D2047 and a 4-byte error detection code (EDC) for detecting an error occurring in the data frame ( Step S1
02). Thereafter, scramble processing is performed, error correction coding is performed on the processed data frame (referred to as a scrambled frame), and an ECC block as shown in FIG. 7 is generated. The ECC block is arranged such that scrambled frames are arranged in 192 rows as 172 bytes in each row, and 208 rows are obtained by adding 16 bytes as an outer code parity PO to each 172 column, and 10 bytes as an inner code parity PI in each of these rows. Are added to form 208 lines each having 182 bytes (step S103).

Further, interleaving is performed from the ECC block to generate 16 recording frames as shown in FIG. 8 (step S104). Next, 8 from the recording frame
A modulation coding of / 16 modulation is performed, and a data field for recording on the optical disk 10 is generated from the recording frame after the modulation processing. When reproducing data recorded on the optical disk 10, the original data cannot be reconstructed unless boundaries between recording frames can be determined. Therefore, as shown in FIG.
A 32-bit synchronization pattern is added to the beginning of the 456 channel bits to generate a 1488-bit synchronization frame, thereby forming a data field. This data field consists of 13 rows, each row consisting of two synchronization frames, and 1456 channel bits in each synchronization frame are:
First and second 91 of each of one row of the recording frame
Octets. Each row of the data field represents each row of the recording frame. As the synchronization pattern, it is desirable to select a pattern that can be easily detected from the recording data sequence and that is not erroneously detected. In FIG. 9, the synchronization pattern sequence used as the synchronization pattern is SY0 to SY0.
Eight types of SY7 are prepared. From these synchronization pattern sequences SY0 to SY7, one synchronization pattern is selected in accordance with the position of the recording frame in the data field after the modulation processing (step S105).

A recording format of an ECC block, which will be described in detail later, is generated from this data field (step S106). According to the generated recording format,
By modulating the intensity of the light beam emitted from the laser diode 23 by the LD driver 32, recording on the optical disk 10 is started as described above (step S).
107).

The position information for dividing the ECC block is generated from the emboss pit information of the ECC block to be recorded next, and the recording is temporarily suspended from this information. As will be described later, the position where the ECC block is divided is set immediately before or immediately after the address information of the sector or immediately before the synchronization pattern series SY0 to SY7 in the data area so as to facilitate reproduction. The interruption time is determined in advance from the length of the emboss pit, the number of rotations of the disc, and a margin area in recording, whereby the emboss pit is provided on a track adjacent to the track where the emboss pit exists. Data can not be recorded in the area adjacent to or opposite to the land (step S108).

Finally, the recording is restarted. At this time, as will be described later, a Gap field as a field for obtaining a standby time until the light beam output from the laser diode 23 as a light source rises to a predetermined power, a Guard field for shifting a position of a phase change mark. Is provided, recording can be resumed (step S10
9).

By performing the recording as described above, FIG.
Recording in the area on the optical disk 10 as shown in FIG. An area 70 in the figure is an embossed pit area where no data is recorded. The area 71 of the land track 13 and the groove track 14 is an area where recording is interrupted,
Data is recorded in the remaining area.

(Reproduction Operation) Next, the outline of the reproduction operation will be described. At the time of reproduction, as shown in FIG. 4, a light beam of constant intensity emitted from the laser diode 503 is irradiated on the optical disk 10 via the collimator lens 504, the beam splitter 505, and the objective lens 506,
Light reflected from the optical disk 10 enters the photodetector 508 via the objective lens 506, the beam splitter 505, and the condenser lens 507. The output of the photodetector 508 is input to an analog arithmetic circuit 513, and a change in reflectance depending on the presence or absence of a recording mark on the recording film 12 is output as a reproduction signal.

During this reproduction, the analog arithmetic circuit 513 generates a periodic signal corresponding to the wobble pattern on the optical disk 10, a focus error signal and a tracking error signal. Then, a speed control signal is generated by the timing extraction circuit 514 according to the periodic signal, and based on the speed control signal, the servo circuit 600 controls the spindle motor 50 via the motor driver 500 based on the speed control signal.
1 is controlled to a predetermined rotation speed. Further, the lens actuator 509 is controlled by the servo circuit 510 based on the focus error signal and the tracking error signal, so that focus servo and tracking servo are performed.

The reproduction signal corresponding to the recording mark output from the analog operation circuit 513 is converted into binary data by the binarization circuit 515, and then converted into binary data.
4 is input. The timing extraction circuit 514 detects a synchronization pattern in the reproduction signal from the binary data, specifically, detects the position and pattern of the synchronization pattern.
Since the reproduction signal includes a bit error caused by a medium defect of the optical disk 10 or the influence of noise, the timing extraction circuit 514 cannot detect the synchronization pattern at a position where the synchronization pattern should be detected, or differs from the original synchronization pattern. A synchronization pattern may be erroneously detected at a position. The timing extraction circuit 514 has a function of correctly detecting the position of the synchronization pattern in consideration of these influences. In addition to the detection position signal of the synchronization pattern, the synchronization pattern includes a synchronization pattern sequence SY0 to SY7 described later.
The boundary of each of the demodulated symbol, the recording block, and the modulated recording sector is determined using the synchronization pattern detection signal indicating which one of the above is used. Binarization circuit 515
Is input to the reproduction data processing unit 516. The reproduction data processing unit 516 performs a process substantially opposite to that of the recording data processing unit 511 on the binary signal from the binarization circuit 515, and outputs a reproduction data sequence Dout.

The procedure of the reproducing operation will be described below. First, the optical head 502 seeks to a sector in which desired recording data is recorded. The analog signal read from the optical head 502 is input to the binarization circuit 515, where it becomes binary data. The binary data is demodulated by 16/8 modulation to become reproduced data. An address exists for each sector. First, this address information is read. As will be described in detail later in the format, the head of the address area is a VFO area, which is used to synchronize the variable frequency oscillation of the phase locked loop of the read channel bit, and obtains a synchronization signal to obtain the subsequent address information. Can be read. From the read address information, determine the position of the ECC block where the address exists,
From this position information, the position information of the area where the recording was interrupted as described above is obtained and the reproduction process is performed. That is, if the ECC block is 2
Area 71 without recording data existing during division into
Is ignored. The data following the area 71 is Ga
Starting from the p field and the Guard field, and subsequently obtaining the VFO, the subsequent address information and the synchronization signal for reading data can be stably obtained.
In this way, the reproduction data corresponding to the desired address is read out and written into the memory. When the reproduction data of the 16 recording frames constituting one ECC block is written to the memory, error correction is performed, and descrambling processing for restoring the scrambled data when generating the recording data is performed. Data series Do
Output as t.

By performing the above-described recording and reproduction, recording and reproduction can be performed in an area on the optical disk 10 as shown in FIG. 10, and cross-talk and recording and reproduction in the case where embossed pits exist in adjacent tracks. Problem can be solved.

(Regarding Recording Format of ECC Block) FIG. 11 shows a recording format of an ECC block on the optical disc 10 in the present embodiment. In the figure, the contents of each field of the ECC block are indicated by the upper alphabet, and the byte length is indicated by the lower numeral. As shown in the figure, address fields AD0 to AD15 are arranged at the head of each sector constituting the ECC block. Sector address fields AD0 to AD15
Is an area for giving address information of each sector constituting the ECC block, and includes a VFO field, an AM field, a PID field, an IED field, and a PA field. Further, in this example, the first sector address field AD0, that is, the address information of the first sector is an EC composed of the embossed pit described with reference to FIGS.
Also serves as address information in C block units.

At the time of data recording, a Buffer-S1 field, a Gap1 field, and a Guard1 field are arranged following the first sector address field AD0, and a VFO field, a PS field, a DATA field of the first sector, and a PA field after the Guard1 field. The fields are sequentially recorded as phase change marks. After this, the VFO field, AM field, PI
Following a second sector address field AD1 consisting of a D field, an IED field, and a PA field,
S field, DATA field of second sector, PA
The fields are sequentially recorded as phase change marks.

Hereinafter, similarly, the sector address field A
Dn (n = 1, 2,..., 15) and the subsequent PS field, DATA field, and PA field have n = 1
It is recorded five times as a phase change mark.

After the 16th sector address field AD15, the PS field following the address field AD15, the DATA field and the PA field of the 16th sector, Gua is added.
rd4 field, Buffer-S2 field, B
buffer3 field is formed, and one EC
The C block is completed.

Here, the position where the recording is interrupted is any one of the arrows in the figure, and is calculated from the information of AD0.
At positions corresponding to the alphabetical letters A, B, and C of the arrows, a Guard2 field, a Buffer1 field, a recording / reproducing interrupted area, a Buffer2 field, and a G
Field blocks A, B, and C including an ap2 field, a Guard3 field, a VFO field, and a PS field are inserted. Here, the position where the field block is inserted corresponds to immediately before the sector address information (A), immediately after the sector address information (B), or immediately before the synchronization pattern in the data area (C). Note that the number of bytes S of the Buffer-S1 field is determined so that the land area where the emboss pits existing in the adjacent track are formed is adjacent to the recording / reproduction interruption area.

The contents of each field will be described below. [VFO field] The VFO field is a field for providing synchronization to the variable frequency oscillator of the phase locked loop of the read channel bit, and is an ECC block address field (first sector address field) AD0.
The VFO field in the field No. and the VFO field following the buffer S1 field, the Gap field, and the Guard1 field after AD0 each have a length of 36 bytes, and the VFO field in the second to sixteenth sector address fields is 12 bytes. Each has a length. Also, the V that follows through the Guard3 field
The FO field differs depending on the recording / playback interruption position,
It has a length of 4 bytes or 36 bytes.

[AM (Address Mark) Field] The address mark is a field for providing byte synchronization to the optical disk apparatus for the next PID field, and is composed of a mark pattern that cannot be generated by 8/16 modulation, and has 3 bytes. With a length of

[PID (Physical Identification Data) Field]
This is 4-byte data including a spare area, a PID number, a sector type, a layer number, and a sector number.

[IED (ID Error Detection Code) Field] IED for detecting an error generated in data ID
, And is 2-byte data.

[PA (postamble) field] Data for completing 8/16 modulation of the last byte of the preceding field (IED field or data field), and 1 byte (16 channel bit length)
With a length of

[Gap (gap) 1, 2 fields]
This is a field for obtaining a waiting time until the light beam output from the laser diode 23 as a light source rises to a predetermined power, and is 10 + J / 16 bytes, that is, (1
60 + J) have a channel bit length. Number J is 0 ≦
It changes randomly between J ≦ 15. However, Gap2
In the field, J = 0. Variations in the length of the Gap1 field are compensated for by the length of the Buffer3 field described later.

[Guard (1), 3 fields] These fields are arranged next to the Gap field, have a length of (20 + K) bytes, and repeat a predetermined 16 channel bit pattern (20 + K) times. Number K
Is the V following the Guard1 (Guard3) field.
In order to shift the position of the phase change mark formed in the field that continues from the FO field to the Guard2 (Guard4) field, the phase change mark randomly changes between “0” and “7”. The first 20 bytes of the Guard1 (Guard3) field are for protecting the beginning of the succeeding VFO field from signal deterioration after performing overwriting many times, and their contents are ignored when reading data.

[Pre-sync code (PS) field] This is data for causing the optical disc apparatus to perform byte synchronization for the next data field, and is 3 bytes (4 bytes).
(8 channel bits).

[DATA (Data) Field] This is an area where the data of the data field described above is recorded as a phase change mark, and has a length of 2418 bytes.

[Guard (Gard) 2, 4 fields] Fields provided before Buffer 1, 2 fields, having a length of (55-K) bytes, and
The same 16-channel bit pattern as in the first and third fields is repeated (55-K) times. Guard1
(Guard3) Field and Guard2 (Guard
d4) Total length of field is 75 regardless of number K
Become bytes. The last 20 bytes of the Guard2 (Guard4) field are for protecting the end of the DATA field after performing overwriting many times from signal deterioration, and the remaining (55-K-20) bytes are used for the optical disk 10. This is for absorbing the fluctuation of the actual length of the data written above, and its contents are ignored when reading the data.

[Buffer (buffer) 1 and 2 fields] Provided immediately before and immediately after the recording / reproduction interruption area,
A change in the actual sector length caused by fluctuations in the rotation speed of the optical disc 10 or eccentricity of the track when writing data in the area from the start of the ECC block to the start position of the recording / reproduction interruption area, and a random shift of the recording position in phase change recording This is to absorb the physical position fluctuation of the recording / reproduction interrupted area due to the above. In this example, the length is 150-M bytes, and the number M is determined by (10 ≦ M ≦ 140) the position of the recording / reproduction interrupted area.

[Buffer 3 field] This is provided at the end of the ECC block, and E
Changes in the actual sector length caused by fluctuations in the rotation speed of the optical disc 10 and eccentricity of the track when data is written in the area up to the end of the CC block, and random shift and start / end deterioration of the recording position during phase change recording. It is a region for absorption, and in this example, 150-J / 16
It has a length of bytes.

[Buffer-S1 field] Buf
The fer-S1 field is provided after the first sector address field AD0 and has a length of S bytes. The number S is (0 ≦ S ≦ 100) in the first sector address field AD so that the area of the embossed pit existing in the adjacent track is exactly adjacent to the recording / reproduction interruption area in the field
It is determined based on the information of 0.

[Buffer-S2 field] Buf
The fer-S2 field is provided immediately before the Buffer2 field so that the sum of the length of the Buffer-S1 field and the length of the Buffer2 field is a fixed 100 bytes regardless of the number S.

[Recording / Reproduction Interruption Area] The recording / reproduction interruption area has a length equal to or longer than the emboss pit length, and no data is recorded in this area. Here is the same as the emboss pit length 4
It has a length of 6 bytes.

The Buff field and the Guard field are provided for each sector in the current DVD-RAM, whereas in the present embodiment, they are provided for two ECC blocks. By doing so, according to the present embodiment, compared to the current DVD-RAM, the format efficiency can be increased by the reduced amount of the buffer area and the guard area.

Hereinafter, the effect of improving the format efficiency according to the present invention will be described with reference to specific numerical examples. The current DVD-RAM has a sector format as shown in FIG. 14, and one sector has a 128-byte header field Header (H1 to H4), a 1-byte mirror field Mirror, and a (10 + J / 16) -byte G
ap field, Guard1 field of (20 + K) bytes, VFO field of 35 bytes, PS field of 3 bytes, DATA field of 2418 bytes, PA field of 1 byte, Guard2 field of (55-K) bytes, (25-J / 16 bytes), and the sector length is 2697 bytes. Since the ECC block is composed of 16 sectors, the ECC block length is 2697 × 16 =
43152 bytes.

On the other hand, in the present embodiment, FIGS.
It looks like 3. FIG. 12 shows an example in which a recording / reproduction interruption area exists immediately before sector address information, and FIG. 13 shows an example in which a recording / reproduction interruption area exists in a data area. From these figures, it is most likely that the recording / reproduction interrupted area exists in the data area and that the Buffer-1 field and the Buffer-2 field are maximum.
This is the case where the CC block length is long (M = 10).

In this case, the ECC block is composed of an ECC block address AD0 of 46 bytes and a buffer of S bytes.
r-S1 field, (10 + J / 16) bytes of Ga
p field, Guard1 field of (20 + K) bytes, VFO field of 36 bytes, P of 3 bytes
S field, 2418 byte DATA field,
Consists of a 1-byte PA field (2488 + K + J
/ 16 + S) byte first sector data and 22 byte sector address ADn (n = 1, 2, 4,..., 15)
Field, 2418-byte DATA field, 1
Byte PA field, 3 byte PS field,
2418-byte DATA field, 1-byte PA
The data includes 2444 bytes each consisting of a field, a total of 34216 bytes of second sector data, fourth sector data to fifteenth sector data, and a recording / reproduction interruption area (2914-2).
M) bytes of third sector data, (55-K) bytes of Guard4 field, and (100-S) bytes of Bu
buffer-S2 field, composed of (150-J / 16 bytes) Buffer2 field;
The CC block length is 39969-2 Mbytes. Here, the ECC block length when M is longer than 10 is 3
9949 bytes.

Therefore, according to the present embodiment, the current DVD
-The ECC block length is 39949 bytes / 43152 bytes = 93% compared to the RAM. That is, the capacity required to record the same data is the current DVD-RA
M is 93%, and the format efficiency is expected to improve by 7%.

As described above, the example in which the recording is interrupted when the emboss pit exists in the adjacent track in both the land and the groove has been described. However, in this method, the crosstalk of the emboss pit portion is larger in the groove than in the land. As described above, the present invention is applied only when recording lands when the crosstalk is sufficiently small in the groove because it is small. In this case, since the recording area increases in the groove, it is possible to further improve the format efficiency by changing the recording format between the land and the groove.

In this embodiment, Buffer-S1
Although the field and the Buffer-S2 field are provided at the head and the rear end in the recording format, the recording / reproduction interruption area is set to the Buffer-S1 field and the Buffer-S2 field.
Buf by increasing the total length of the field by the number of bytes
A recording format that eliminates the fer-S1 field and the Buffer-S2 field is also possible.

Further, in this embodiment, the rotation control method is C
Although the description has been made on the assumption of the LV, ZC which is another rotation control method is used.
The present invention is also applicable to LV and ZCAV. ZCLV, ZC
In the AV, since the number of revolutions in the zone is the same, the position where the emboss pit is always adjacent in the zone is the same in the format, and the recording / reproduction interruption area is fixed at a fixed position in the format. In this case, Buffer-S
1 field, Buffer-S2 S value and Bu
The value of M in the buffer-1 field and the buffer-2 field is constant within the zone.

[0079]

As described above, according to the present invention, the position information of the error correction block is recorded in advance as an emboss pit on the optical disk, and the data of each sector of the error correction block is recorded based on the position information. When recording the address information of the sector, logical position information in which the error correction block is divided into two blocks from the position information of the error correction block and recording between the two divided blocks are performed. By generating a reproduction interruption area and temporarily suspending the recording in the recording / reproduction interruption area, the format efficiency is improved, and the recording mark does not exist in the area where the embossed pit exists in the adjacent track. During playback, crosstalk from the embossed pit of the adjacent track or during playback of the embossed pit, It is possible to eliminate the talk.

In a land track where an embossed pit exists on an adjacent land, a groove exists on one side of the land track, but the other side is flat in a land state, and the recording and reproduction characteristics have grooves on both sides. Unlike the existing position, it is possible to solve the problem that the recording / reproducing itself becomes difficult such that a desired recording mark cannot be formed, and the DC component of the reproducing signal partially largely changes.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing a part of an optical disc according to an embodiment of the present invention.

FIG. 2 is a plan view showing a track pattern on the optical disc.

FIG. 3 is a plan view showing a spiral format on the optical disc.

FIG. 4 is a block diagram showing a configuration of an optical disk device according to one embodiment of the present invention.

FIG. 5 is an exemplary flowchart illustrating the procedure of a recording process in the embodiment.

FIG. 6 is a diagram showing a data frame structure.

FIG. 7 is a diagram showing an ECC block logical structure.

FIG. 8 is a diagram showing a structure of a recording frame.

FIG. 9 is a diagram showing a structure of a data field.

FIG. 10 is an exemplary plan view showing a recording / reproduction interruption area and a recording area on a track of the optical disc in the embodiment.

FIG. 11 is an exemplary view showing a recording format of an ECC block on the optical disc in the embodiment.

FIG. 12 shows a certain E on the optical disc in the embodiment.
FIG. 3 is a diagram showing a recording format of a CC block.

FIG. 13 shows a certain E on the optical disc in the embodiment.
FIG. 4 is a diagram showing another recording format of a CC block.

FIG. 14 is a diagram showing a sector format in a conventional DVD-RAM.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Optical disk 11 ... Disk substrate 12 ... Recording film 13 ... Land track 14 ... Groove track 15 ... Land part of the division area | region of a groove track 16 ... Emboss pit 21 ... Emboss pit (land side) 22 of the adjacent track of the ECC block to be recorded 22. ... Emboss pit (groove side) of track adjacent to ECC block to be recorded 23. Recording / reproduction suspended area (on land track) 24. Recording / reproduction suspended area (on groove track) 500 motor driver 501 spindle motor 502 optical head 503 ... Laser diode 504 ... Collimator lens 505 ... Beam splitter 506 ... Objective lens 507 ... Condenser lens 508 ... Photodetector 509 ... Lens actuator 510 ... Servo circuit 511 ... Recording data processing unit 512 ... LD driver 51 ... analog arithmetic circuit 514 ... timing extracting circuit 515 ... binarizing circuit 516 ... reproduction data processing unit 517 ... controller 518 ... CPU 70 ... emboss pit area 71 ... recording playback interrupt area

Claims (8)

[Claims] A land track and a groove track are alternately provided adjacent to each other, and data recording and reproduction are performed in units of an error correction block including a plurality of sectors by using at least one of the land track and the groove track. An optical disc capable of being formed on one of a land portion provided by dividing the groove track and a boundary between the land track and the land portion located on both sides of the groove track provided with the land portion. And an area adjacent to the land portion on the land track located on the side where the emboss pit is not formed,
An optical disc characterized by a recording / reproduction interruption area in which data recording and reproduction are not performed. 2. A recording area in which data is not recorded or reproduced in an area on a groove track adjacent to a land track on the side where the embossed pits are formed and opposed to the land portion with the land track interposed therebetween. 2. The optical disc according to claim 1, wherein the optical disc is a reproduction interruption area. 3. The optical disk according to claim 1, wherein the emboss pit is formed for each error correction block, and records the position information of the error correction block. 4. The optical disk according to claim 3, wherein the error correction block is divided into a plurality of blocks, and the recording / reproduction interruption area is formed between the plurality of blocks. 5. The optical disc according to claim 4, wherein a buffer area is provided in each of the plurality of divided blocks. 6. The logical position at which the error correction block is divided into a plurality of blocks is immediately before a synchronization pattern in a data area, immediately before sector address information, or immediately after sector address information. The optical disc according to claim 4. 7. An optical disc apparatus for recording or reproducing data in units of error correction blocks comprising a plurality of sectors on at least one of a land track and a groove track on an optical disc, wherein said groove track of said optical disc is divided and provided. When recording or reproducing data of each sector and address information of the sector based on position information obtained from embossed pits provided on the boundary between the land portion and the land track, based on the position information, Generating logical position information into which the error correction block is divided and a recording / reproduction interruption area inserted between the divided blocks, and temporarily suspending data recording or reproduction in the recording / reproduction interruption area. An optical disc device characterized by the above-mentioned. 8. When generating logical position information for dividing the error correction block into a plurality of blocks, a logical position at which the error correction block is divided is determined by a position immediately before a synchronization pattern in a data area. Alternatively, the optical disk device is located immediately before the sector address information or immediately after the sector address information.