JPH1196668A - Optical disk recording device and optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the transfer rate at the occasions of recording and reproducing to optical disks with a simple configuration. SOLUTION: These devices are provided with a recorded data processing means 12 which divides the data to be recorded every specified unit to constitute segmented data by imparting at least specified pattern data and data of the segment number to each divided data, plural buffer memories 21-25 which are supplied with the segment data processed by this recorded data processing means 12 in the unit of segment in the smaller order of the respective residual amount of memory and plural optical pickups 31-36 which simultaneously record the data stored in the respective buffer memories into the track of an optical disk in the unit of segment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording using an optical disk and an optical disk reproducing apparatus for reproducing data recorded on the optical disk.

[0002]

2. Description of the Related Art Various recording apparatuses and reproducing apparatuses using optical disks have been put to practical use. For example, binary data (digital data of 1 or 0) modulated by a predetermined method is recorded by forming pits on a signal recording surface of a disk, and during reproduction, the presence or absence of the pits is irradiated on the signal recording surface of the disk. There is an apparatus which performs processing for reproducing recorded binary data by detecting it from the returned light of the laser beam.

Further, a magnetic film on which information is recorded in a magnetization direction is formed as a recording film, and in a state where a modulation magnetic field is generated, information is recorded in advance on the recording film at a position irradiated with a laser beam. On the other hand, there is a reproducing apparatus using a disk called a magneto-optical disk, which detects a change corresponding to the magnetization direction of the reflectivity of a laser beam at the time of reproduction and performs processing for reproducing recorded information. . In this specification, an optical disk is a disk on which data can be recorded and reproduced by laser light, and a disk on which various optical recording and reproduction can be performed, such as a magneto-optical disk and a phase change disk. Shall be included.

[0004]

By the way, in an optical disc on which recording and reproduction are performed by these recording devices and reproduction devices, the transfer rate of recorded data is determined to a predetermined value. On the other hand, there is a demand for increasing the data writing speed and the reading speed, and a specified linear velocity (in the case of constant linear velocity control: CLV control) and a rotational angular velocity (in the case of constant rotational velocity control: CAV control) Often, the disk is rotated at a faster speed to improve the transfer rate. For example, by rotating the disk at 10 times the prescribed speed, the transfer rate can be improved to 10 times.

As described above, it is possible to increase the transfer rate by increasing the rotation speed of the disk, but there is a limit to increasing the rotation speed of the disk. That is, when recording or reproducing data on an optical disk, a desired track is scanned with a laser beam from an optical pickup, and data is recorded on the track with a laser beam or the like, or a reflected beam of the laser beam from the track is read. It is necessary to properly irradiate the laser beam from the optical pickup to the track to be recorded or reproduced. Specifically, it is necessary to perform various servo controls related to the optical pickup, such as tracking servo control for matching the irradiation position of the laser beam to the track of the track to be recorded or reproduced. Here, as the disk rotation speed increases, higher-speed servo control is required, and it is necessary to take measures by widening the servo band.However, there is a limit to speeding up servo control. There has been a limit to increasing the rotation speed of the disk in a state where reproduction is possible.

As a method of improving the data transfer rate other than increasing the rotation speed of the disk, for example, a plurality of optical pickups are provided, and the plurality of optical pickups scan different tracks at the same time, so that a plurality of tracks are simultaneously scanned. Writing and simultaneous reading may be performed.
If a configuration is used in which a plurality of optical pickups are arranged on one disk, the configuration of the apparatus becomes more complicated, and it is necessary to perform tracking servo control on the target track for each optical pickup. There was a problem that became complicated.

FIG. 6 is a diagram showing an example of a configuration in which simultaneous recording and reproduction are performed by a plurality of optical pickups conventionally proposed. In this case, tracks are formed in a spiral shape on both sides of the optical disc 1. To use.
However, in this case, the track formed on one surface and the track formed on the other surface are formed to be spiral in opposite directions when each surface is viewed from the surface. After the optical disc 1 having such a configuration is driven to rotate by the spindle motor 2, the track on one surface is scanned by the first optical pickup 3 to perform recording or reproduction, and the track on the other surface is recorded on the second surface. Optical pickup 4
To perform recording or reproduction. Here, the two optical pickups 3 and 4 move in the radial direction of the disk 1 (the direction of arrow a and the direction of arrow b) depending on the scanning position.
Control of the recording position or the reproduction position so that the radial position of the first optical pickup 3 for scanning the track on one surface and the radial position of the second optical pickup 4 for scanning the track on the other surface are equal. I do.

By controlling the optical pickups 3 and 4 that scan each surface so that the radial positions are equal, simultaneous recording and reproduction can be performed by the two optical pickups with relatively easy control. Compared to the data transfer rate for recording and playback with two optical pickups.
Recording and reproduction can be performed at twice the transfer rate. However, in this configuration, it is impossible to improve the transfer rate more than twice, and it is necessary to scan the tracks on both sides. Therefore, the transfer rate cannot be improved using only the tracks on one side of the disk. . In the case of the configuration shown in FIG. 6, the tracks on one side and the tracks on the other side are spirally formed in the opposite direction as the optical disk. Therefore, there is a disadvantage that the manufacturing cost of the optical disk is increased.

An object of the present invention is to propose a recording apparatus and a reproducing apparatus which can improve a transfer rate at the time of recording and reproducing on an optical disk.

[0010]

In order to achieve the above object, an optical disk recording apparatus according to the present invention divides data to be recorded into predetermined units and stores at least specific pattern data and segment number data in each divided data. Recording data processing means for adding and converting the data into segment data; a plurality of buffer memories in which the segment data processed by the recording data processing means are supplied in segment units in ascending order of the remaining storage capacity; A plurality of optical pickups for simultaneously recording data stored in the memory on a track of the optical disk in segment units.

According to this configuration, data divided in segments is supplied in parallel to each of the plurality of optical pickups, and data can be recorded using the plurality of optical pickups simultaneously.

An optical disk reproducing apparatus according to the present invention comprises: a plurality of optical pickups for simultaneously reproducing recorded data from a track of an optical disk in segment units; a buffer memory for storing data reproduced by each optical pickup; And a reproduction data processing unit for arranging the reproduction data stored in the data array in the original data array based on the data of the segment number given in each segment unit.

According to such a configuration, the data in the segment unit reproduced by each of the plurality of optical pickups is returned to the original data array according to the segment number, and the data is reproduced by using the plurality of optical pickups simultaneously. Can be processed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

First, the configuration of the optical disk used in the apparatus of the present embodiment will be described. In the optical disk of the present embodiment, tracks are formed in advance in a spiral or concentric manner by a predetermined method. A clock signal is recorded on the entire surface in advance. The recording state of the clock signal is such that when this track is scanned at a constant linear velocity, a constant frequency is detected as the clock signal (hereinafter referred to as a constant linear velocity recording state). As a specific example of the track forming state and the clock signal recording state, for example, a track is formed in a spiral shape by a groove called a groove, and pits are formed in the groove, and wobbling of the groove is constant. A clock signal of a frequency is recorded at a constant linear velocity. Alternatively, the track may be formed by another method and the clock signal in the track may be recorded.

The optical disk of this embodiment having tracks as described above may be either a track formed on only one side or a track formed on both sides. The tracks on each surface are formed in the same state. That is, for example, when tracks are formed spirally on a double-sided recording disc,
The spiral direction when each surface is viewed from the surface is the same (that is, the spiral direction when the tracks on both surfaces are overlapped and viewed) is the same. In the following description of the recording system and the reproduction system with reference to FIGS. 1 to 3, it is assumed that recording and reproduction are performed using an optical disk having tracks formed in a spiral shape only on one side, and a double-sided disk is described. Examples of use will be described later.

Next, a description will be given of the configuration of an optical disk apparatus (here, configured as an apparatus that performs both recording and reproduction) on which the optical disk configured as described above is mounted. FIG. 1 is a block diagram showing a configuration of a recording system of the apparatus of the present embodiment. The recording data obtained at a recording data input terminal 11 is supplied to a recording processing unit 12 to perform a recording process. As a process for recording in the processing unit 12, a process of converting the recording data into data having a sector structure is performed.

The sector structure here will be described.
FIG. 3 is a diagram showing the structure of one sector in the present example. One sector is divided into a predetermined number (here, M + N: M and N are arbitrary numbers determined according to the method), and all the segments have the same data. The synchronization part D1, the segment number part D2, the sector number part D3, and the recording method data part D
4, a data part D5 and a parity part D6.

The synchronizing section D1 is provided with synchronizing data which is specific pattern data indicating the beginning of a segment. In the segment number part D2, data of a segment number sequentially assigned to each segment in one sector is arranged. In the sector number part D3, data of the number of the sector to which the segment belongs is allocated. Recording method data part D
Reference numeral 4 denotes data relating to a method of recording data. Specifically, data of an error correction method (ECC method) and data of a data distribution method indicating a data distribution state in a sector are recorded. The data part D5 is provided with data to be actually recorded. However, in the case of this example, parity data is allocated to the data portion D5 from the (M + 1) th segment S _{M + 1} to the (M + N) th segment S _{M + N} in one sector composed of M + N segments. Is done. Parity data generated based on the data allocated to the data unit D5 is allocated to the parity unit D6.

The parity data allocated to the parity part D6 is a parity formed within one segment (horizontal direction in FIG. 3) and a parity formed with respect to data from the segment number part D2 to the data part D5. is there. Data part D
5, the parities arranged from the (M + 1) th segment S _{M + 1} to the (M + N) th segment S _{M + N} are parities formed between the segments in the sector (vertical direction in FIG. 3), and Parity formed for data.

In the data of the error correction method recorded in the recording method data part D4, data such as the location and length of these horizontal parity and vertical parity and the method of error correction are recorded. Similarly, recording method data section D4
In the data in the data distribution state recorded in the data, data such as a recording position when data is dispersedly recorded, a method of assigning a sector address, and the like are recorded.

The parity data allocated to the data section D5 and the parity section D6 is subjected to an arithmetic processing to be generated in the recording processing section 12 based on an error correction method applied to the recording data at that time.

The recording data having such a segment structure is transferred from the recording processing unit 12 to the main buffer memory 13.
To supply. The main buffer memory 13 is composed of a so-called first-in first-out (hereinafter referred to as FIFO) memory in which writing and reading of data are controlled under the control of the memory control unit 14 and data is read in the order in which the data was written. Is a memory having a relatively large capacity (for example, a capacity capable of storing about several tens of segments).

The recorded data of the segment structure once stored in the main buffer memory 13 is stored in the memory controller 1.
The data is read out under the control of 4 and supplied to any one of a plurality of sub-buffer memories 21, 22, 23, 24, and 25 (the number corresponding to the optical pickup described later: 5 in this case) and stored. For these five buffer memories 21 to 25 as well, data writing and reading are controlled by the control of the memory control unit 14, and F is read in the order in which the data was written.
It is composed of an IFO memory, but each has a relatively small storage capacity (for example, about 1.5 segments). The details of the process of allocating the output data of the memory 13 to the five buffer memories 21 to 25 will be described later, but the process of allocating the data to the five buffer memories 21 to 25 is performed in segment units. The writing / reading of the buffer memories 13, 21 to 25 by the memory control unit 14 is controlled by the system controller 1 of the optical disk device.
5 is executed based on an instruction from

The recording data of each segment stored in each of the buffer memories 21 to 25 is stored in the optical pickups 31, 32, 33,
The laser light is supplied to the laser light sources 34 and 35, and is supplied to the drive unit of the laser light source in the optical pickup to control the laser light source in a state corresponding to the recording data. 5 optical pickups 31 to
35 is arranged so that a laser beam scans a track formed on one side of one optical disk for recording data,
The radial positions of the laser beams from the optical pickups 31 to 35 on the disk are individually controlled by the system controller 15 of the optical disk device. In this case, the positions of the optical pickups 31 to 35 are
The pickup position detectors 41 to 45 corresponding to the number of optical pickups detect the position, and the detected data is determined by the system controller 15.

5 under the control of the system controller 15
The scanning positions of the optical pickups 31 to 35 are as follows.
For example, a spiral track formed on one surface of one optical disk is divided into five ranges, and each of the five divided ranges is assigned to five optical pickups.
A process in which each optical pickup individually scans the track in the range divided into five may be considered. Alternatively, the five optical pickups 31 to 35 may be used to simultaneously scan a predetermined number of tracks at intervals and repeat a track jump every predetermined rotation (for example, simultaneous scanning of five tracks separated by one track pitch and disc rotation). System controller 1 so as to perform a track jump every rotation).
5 may control.

When data is recorded by driving the laser light source in each of the optical pickups 31 to 35, the clock recorded on the track is obtained from the return light of the laser light applied to the track from each optical pickup. Detect signal. The detected clock signals are stored in buffer memories 21 to 2 connected to the respective optical pickups 31 to 35.
5 to read out data stored in each buffer memory in synchronization with the clock signal and supply the data to the optical pickup.

The rotation control system of the optical disk during recording is configured so that a spindle servo system (not shown) controls the rotation at a constant angular velocity under the control of the system controller 15.

Next, the flow of print data when printing is performed by the printing system circuit of this embodiment will be described. The recording data obtained at the input terminal 11 is converted by the recording processing unit 12 into data having a segment structure shown in FIG.
3 is stored. The data stored in the buffer memory 13 is distributed and supplied to the sub-buffer memories 21 to 25 connected to the five optical pickups 31 to 35,
Each of the optical pickups 31 to 35 performs a process of recording in different tracks on the optical disk in a segment unit. Therefore, for example, at the start of recording, the data of the segment structure stored in the buffer memory 13 is equally distributed and supplied to the five buffer memories 21 to 25 in segment units.

Here, at the time of recording, control is performed to rotate the optical disk at a constant angular velocity. In the track of the optical disk recorded by the apparatus of this embodiment, a clock signal detected as a constant frequency at a constant linear velocity is previously recorded. The data of the segment structure stored in the buffer memories 21 to 25 is recorded at a transfer rate synchronized with the frequency of the clock signal which is recorded and detected from the track being scanned by each of the optical pickups 31 to 35. For this reason, the transfer rate at the time of recording differs depending on the radial position of the track to be recorded, and the recording is performed at a higher transfer rate toward the outer track of the disk.

Therefore, the five optical pickups 31 to 3
5, when the recording is simultaneously performed at different radial positions of the tracks formed on the disk, the transfer rate changes in accordance with the radial positions, so that the storage of the recording data in the five buffer memories 21 to 25 is performed. A change occurs in the amount, and the data is lost as soon as the buffer memory connected to the optical pickup for recording on the outer track. The memory control unit 14 controls the transfer of data from the buffer memory 13 to each of the buffer memories 21 to 25 so that the remaining amounts of the five buffer memories 21 to 25 do not run out. Will supply more segments as the buffer memory is connected.

As a specific example of control, assuming that the storage capacity of each sub-buffer memory 21 to 25 is 1.5 segments, at the start of recording, the five buffer memories 21 to 25 store the main buffer memory. When data is transferred one segment at a time from 13 and free space for one segment is created in any of the buffer memories 21 to 25,
It requests the memory controller 14 to supply data, and causes the main buffer memory 13 to transfer one segment of data. If there is a simultaneous transfer request from a plurality of sub-buffer memories, for example, one segment of data is first transferred to the sub-memory connected to the pickup with the higher recording transfer rate at that time.

By performing the recording process in this manner, five optical pickups 31 to 35 can record simultaneously on one disk, and the average is smaller than when recording is performed using only one optical pickup. Can record about five times the amount of data simultaneously, without increasing the rotation speed of the disk (ie, without imposing a load on the servo system of the disk), and increasing the transfer rate of the recorded data by about five times. Can be In addition, the data recording state on the disc is the same recording density as that recorded by the constant linear velocity control, which is the most efficient recording, and a good recording state can be obtained.

Here, an example in which five optical pickups are provided has been described. However, an arbitrary number of optical pickups may be arranged according to a required transfer rate so that simultaneous recording can be performed. Also, an optical disk having tracks formed on both sides is prepared, and a plurality of optical pickups of this example are dispersedly arranged on one side and the other side so that recording is simultaneously performed on tracks on both sides. You may comprise. Even in the case of double-sided recording, since the position of each optical pickup can be independently controlled for recording, the spiral direction of the track when the respective surfaces are viewed from the surface is the same (that is, when the tracks on both surfaces are overlapped). Even if the spiral direction is reversed), data can be simultaneously recorded on tracks on each surface, and the transfer rate can be improved. By using a double-sided recording disk in which the spiral direction of the track on each side is configured in the same manner as described above, when configuring a double-sided recording disk, the same original is used as the original for manufacturing each side. The discs on each side manufactured in the above can be laminated to form a double-sided recording disc, and it is not necessary to prepare a different original for each side, and the manufacturing cost of the double-sided recording disc can be reduced.

It should be noted that five optical pickups 31 to 31 are always used.
Rather than performing recording by 35, recording is performed using an arbitrary number of optical pickups 31 to 35 prepared, for example, according to the transfer rate of recording data obtained at the input terminal 11. Control may be performed as follows.

Next, the configuration of a reproducing system for reproducing data recorded on an optical disk with the above-described configuration will be described. FIG. 2 is a block diagram showing a configuration of a reproducing system of the apparatus of the present embodiment.
As in the recording system, five optical pickups 31 to 35 are used to reproduce the recorded data from any five places on the track formed on the optical disk. Here, reproduction by each of the optical pickups 31 to 35 is performed by the system controller 1.
5, the radial positions of the optical pickups 31 to 35 are detected by the pickup position detection units 41 to 45, and the detection data is determined by the system controller 15.

The signals reproduced by the optical pickups 31 to 35 include, in addition to the recorded data having the segment structure, a clock signal recorded in advance by a predetermined method, and are reproduced in synchronization with the reproduced clock signal. The recorded data is written into buffer memories 21 to 25 connected to the optical pickup. Here, between each optical pickup 31-35 and each buffer memory 21-25,
Synchronization pattern detection units 51 to 55 are connected. When the synchronization pattern detection units 51 to 55 detect a synchronization pattern (see FIG. 3) at the head of each segment, data of one segment following the synchronization pattern is transmitted. A process for writing data into the buffer memories 21 to 25 is performed.

The reproduction data stored in the buffer memories 21 to 25 is transferred to the buffer memory 13 in segment units under the control of the memory control unit 14 based on a command from the system controller 15. The buffer memory 13 supplies the supplied reproduction data to the reproduction processing unit 16 in the supplied order. In the reproduction processing unit 16, based on the data of the sector number and the segment number assigned to each segment of the supplied segment-based data,
Perform processing to return to the data array in the order of the original sector structure,
The data of the data portion D5 is extracted from each segment of the sector structure of the original arrangement, the data is subjected to a correction process based on parity, and error-corrected data is output from the reproduction data output terminal 17 as time-series data. Let it.
When the reproduction processing unit 16 returns to the original data array,
Reference is also made to the data of the recording method data section D4 recorded in each segment.

Next, a description will be given of the flow of reproduction data when reproduction is performed by the reproduction system circuit of this embodiment. Each optical pickup 3
The data reproduced in synchronism with the clock signal in 1 to 35 is stored in the sub buffer memories 21 to 25 and transferred to the main buffer memory 13 according to the storage capacity of the sub buffer memories 21 to 25. For example, assuming that the capacity of each sub-buffer memory 21 to 25 is 1.5 segments, a transfer request is made to the memory control unit 14 at the stage when one segment of data is stored in each sub-buffer memory 21 to 25, The data is transferred to the buffer memory 13 under the control of the memory control unit 14. When there is a transfer request from a plurality of buffer memories at the same time, the data is transferred from the memory having the higher reproduction transfer rate at that time.

The data transferred to the main buffer memory 13 in segment units is sequentially supplied to a reproduction processing unit 16, and the order of the data is rearranged by using the RAM provided in the reproduction processing unit 16, so that the data is correctly arranged. Time-series data is output from the output terminal 17.

By performing the reproduction process in this manner, five optical pickups 31 to 35 can simultaneously reproduce one disc, and the average is smaller than the case where reproduction is performed only by one optical pickup. Can reproduce about 5 times the amount of data simultaneously, without increasing the rotation speed of the disk (ie, without imposing a load on the servo system of the disk), and increasing the transfer rate of the reproduced data by about 5 times. Can be

Here, an example in which five optical pickups are provided has been described. However, an arbitrary number of optical pickups may be arranged according to a required transfer rate so that simultaneous reproduction can be performed. Also, an optical disk having tracks formed on both sides is prepared, and a plurality of optical pickups of this example are dispersedly arranged on one side and the other side so that the tracks are simultaneously reproduced from the tracks on both sides. You may comprise. Even in the case of this double-sided reproduction, since the position of each optical pickup can be independently controlled and reproduced, the spiral direction of the track when the respective surfaces are viewed from the surface is the same (that is, when the tracks on both surfaces are overlapped). Even if the spiral direction is reversed), data can be simultaneously reproduced on tracks on each surface, and the transfer rate can be improved.

During reproduction, the reproduction is not always performed by the five optical pickups 31 to 35, but is performed.
In accordance with the transfer rate of the reproduction data, for example, control may be performed so that reproduction is performed using an arbitrary number of optical pickups among the five optical pickups 31 to 35 prepared.

The recording process described with reference to FIG. 1 is performed by some of the plurality of prepared optical pickups, and the reproduction process described with reference to FIG. 2 is performed by the remaining pickups. In this way, recording and reproduction may be performed simultaneously.

Note that the segment structure shown in FIG. 3 is an example, and other segment structures may be used. For example, as shown in FIG.
The recording method data section D4 may be recorded only in the _first segment S1 of each sector, and the data may be recorded in the sector number section D3 and recording method data section D4 of the other segments.

As a control state during recording or reproduction, a system controller or the like may control a recording state or reproduction state so that transfer rates during recording or reproduction with a plurality of optical pickups are equal. good. FIG. 5 shows an example of this case. For example, when the optical disk 10 having spiral tracks formed on both surfaces is driven to rotate by the spindle motor 18, one surface is recorded / reproduced by the optical pickup 31. The other surface is recorded / reproduced by the optical pickup 32. In this case, the innermost position of each side of the track at R _min, the outermost position is assumed to be R _max, the scanning position R1 of one side by the optical pickup 31, an arrow from the innermost circumferential position R _min X along the spiral track as indicated by changing the order on the outer peripheral side, the scanning position of the other surface by the optical pickup 32 R2 is the inner circumferential side along the outermost position R _max in a spiral track as indicated by the arrow Y Change in order.

By performing the recording processing and the reproduction processing in this manner, the total of the transfer rates of the data recorded by the two optical pickups and the data to be reproduced can always be substantially constant. For example, when the rate of the recording data obtained in step 11 is constant, the recording processing can be performed well.

In the above-described embodiment, the method of recording data on the optical disk has not been specifically described. However, various types of optical disks capable of optically recording and reproducing data using an optical pickup. The present invention can be applied to the present invention. For example, the present invention can be applied to an optical disk in which data is recorded by forming pits, a so-called magneto-optical disk in which data is recorded in a predetermined track in a magnetization direction, and a phase change disk in which data is recorded by a phase change. .

[0049]

According to the optical disk recording apparatus of the present invention, each of the plurality of optical pickups has:
Data divided in segment units is supplied in parallel, and data can be recorded by using a plurality of optical pickups simultaneously, and the data transfer rate during recording is increased according to the number of optical pickups. It becomes possible.

According to the optical disk recording apparatus described in claim 2, in the recording apparatus described in claim 1, an optical disk in which a clock signal is recorded over a substantially entire surface of a track at a constant linear velocity in a predetermined state. Each optical pickup detects the clock signal at the recording location and records segment data at a rate synchronized with the detected clock signal, allowing data to be recorded at a constant linear density on the track. High-density recording similar to the case of recording by so-called constant linear velocity control can be performed by simultaneously using a plurality of optical pickups, and the data transfer rate during recording can be effectively increased.

According to the optical disk recording device described in claim 3, in the recording device described in claim 1, two optical pickups are prepared, and the first optical pickup is mounted on the inner peripheral side of one surface of the disk. The second optical pickup sequentially scans from the track on the outer peripheral side of the other surface of the disc to record data, thereby recording the data. Can be made substantially constant, and data supplied at a constant transfer rate can be recorded satisfactorily.

According to the optical disk reproducing apparatus of the fourth aspect, the data of each segment reproduced by each of the plurality of optical pickups is returned to the original data array according to the segment number, and the plurality of optical pickups are used simultaneously. Data can be reproduced and processed, and the data transfer rate during reproduction can be increased in accordance with the number of optical pickups.

According to a fifth aspect of the present invention, in the reproducing apparatus of the fourth aspect, an optical disc in which a clock signal is recorded on a substantially entire surface of a track at a constant linear velocity in a predetermined state is used. Used, each optical pickup detects the clock signal of the reproduction position, detects the recording position of the segment from the specific pattern data assigned to each segment at a rate synchronized with the detected clock signal, By reproducing data in segment units, data can be reproduced from the data recorded on the track at a constant linear density. They can be used simultaneously, and the data transfer rate during reproduction can be effectively increased.

According to the optical disk reproducing apparatus of the sixth aspect, in the reproducing apparatus of the fourth aspect, two optical pickups are prepared, and the first optical pickup is located on the inner peripheral side of one surface of the disk. The second optical pickup sequentially scans from the track on the outer peripheral side of the other surface of the disc to reproduce the data, thereby reproducing the data. Can be made substantially constant, and the reproduction processing when outputting the reproduction data at a constant transfer rate can be performed satisfactorily.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a playback configuration according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration example of segment data according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing another configuration example of the segment data according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of a transfer rate constant process during double-sided recording (reproduction) according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of a conventional double-sided recording / reproduction process.

[Explanation of symbols]

10 optical disk, 11 recording data input terminal, 12
Recording processing unit, 13: buffer memory, 14: memory control unit, 15: system controller, 16: reproduction processing unit,
17 playback data output terminal, 21-25 buffer memory, 31-35 optical pickup, 41-45 pickup position detector

Claims (6)

[Claims] 1. An optical disk recording apparatus for recording data on an optical disk having tracks formed in a spiral or concentric shape, wherein data to be recorded is divided into predetermined units, and at least a specific data is assigned to each of the divided data. Recording data processing means for giving pattern data and segment number data to create segment data; and a plurality of segment data processed by the recording data processing means being supplied in segment units in ascending order of their remaining storage capacity. An optical disc recording apparatus comprising: a buffer memory; and a plurality of optical pickups for simultaneously recording data stored in the respective buffer memories on a track of the optical disc in segment units. 2. The optical disc recording apparatus according to claim 1, wherein said optical disc uses a clock signal recorded on a substantially entire surface of said track at a constant linear velocity in a predetermined state. Is an optical disk recording apparatus that detects a clock signal at a recording location and records the segment data at a rate synchronized with the detected clock signal. 3. The optical disk recording device according to claim 2, wherein the optical disk has a track formed on both sides and is rotated at a constant angular velocity.
The second two optical pickups are prepared, the first optical pickup records data on a track on one surface, and the second optical pickup records data on a track on the other surface. The first optical pickup is sequentially scanned from the inner track of the disc to record data, and the second optical pickup is sequentially scanned from the outer track of the disc to record data. An optical disk recording apparatus in which the total transfer rate of data recorded by the optical pickup 2 is substantially constant. 4. An optical disk reproducing apparatus for reproducing data recorded on an optical disk having tracks formed in a spiral or concentric manner, comprising: a plurality of optical pickups for simultaneously reproducing recorded data from the tracks of the optical disk in segment units; A buffer memory for storing data reproduced by the respective optical pickups; and arranging the reproduced data stored in the buffer memory in the original data array based on the data of the segment number assigned to each segment. An optical disc reproducing device comprising a reproduction data processing means. 5. The optical disk reproducing apparatus according to claim 4, wherein said optical disk uses a clock signal recorded on a substantially entire surface of said track at a constant linear velocity in a predetermined state. Detects the clock signal at the reproduction point, detects the recording position of the segment from the specific pattern data assigned to each segment at a rate synchronized with the detected clock signal, and reproduces the data in segment units. Optical disk playback device. 6. The optical disk reproducing apparatus according to claim 4, wherein the optical disk has a track formed on both sides and is rotated at a constant angular velocity.
A configuration is provided in which two second optical pickups are prepared, the first optical pickup reproduces the recording data of the track on one surface, and the second optical pickup reproduces the recording data of the track on the other surface, The first optical pickup sequentially scans from the inner track of the disc to reproduce data, and the second optical pickup sequentially scans from the outer track of the disc to reproduce data. An optical disk reproducing apparatus in which the total transfer rate of data reproduced by the second optical pickup is substantially constant.