JPH1064196A - Optical disk and optical disk recorder, as well as optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to promptly transfer data to adjacent track without the tracking operation of light beam, by recording the data by making track flux priority precede to track priority when the data is recorded over plural tracks. SOLUTION: When a host interface 10 receives the instruction to record the continuous data to an optical disk 1, a controller 12 records the data. The optical disk 1 is rotated by a spindle motor 2. The optical disk 1 is irradiated with three pieces of light beams b1 to b3 from light emitting elements 31 to 33 of an optical pickup 5. A feed motor 6 moves the optical pickup 5 in accordance with the instruction from the controller 12 and positions the light beams b1 to b3 to the spirals T1 to T3 to be recorded. The recording data d0 is inputted to a buffer memory 101 and is divided to plural blocks in a recording sequence determining means 102 and is then successively recorded by recording circuit 103 to 105.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having continuous data recorded on a plurality of tracks, and an optical disk recording apparatus and an optical disk reproducing apparatus for recording and reproducing the optical disk with a plurality of light beams.

[0002]

2. Description of the Related Art Hitherto, as one of means for increasing the data transfer speed of an optical disk apparatus, an apparatus for simultaneously reproducing a plurality of tracks on an optical disk has been proposed. For example, an optical disk reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 6-89440 will be described with reference to FIG. Terminal 11
When the host interface 10 receives an instruction to reproduce the adjacent tracks T1 to T3 on the optical disk 1 from the host device via the host device, the controller 12 performs the reproduction operation by issuing an instruction to each unit. First, the optical disc 1 is rotated by the spindle motor 2, and the feed motor 6 is controlled to position the optical pickup 5 on the tracks T1 to T3. The tracks T1, T2, and T3 on the optical disk 1 are irradiated with laser beams from the light emitting elements 31, 32, and 33, respectively.
The respective reflected lights are converted into electric signals by the light receiving elements 41, 42, and 43, and are reproduced independently by the reproduction circuits 71, 72, and 73. The data independently reproduced for each track is temporarily stored in the buffer memory 9 via the memory control circuit 8, and then stored in the same order as the track arrangement on the optical disc 1 (that is, in the order of T1, T2, T3). ) And sent from the terminal 11 of the host interface 10 to the host device.

Thus, a plurality of tracks are simultaneously read using a plurality of light beams and stored in a buffer memory.
The data transfer speed has been increased by reading the tracks in the same order as the arrangement of the tracks on the optical disk. Further, the power consumption is reduced by reducing the rotation speed of the disk without lowering the transfer speed.

[0004]

In the above-mentioned conventional optical disk reproducing apparatus, three tracks are read simultaneously, but when the total number of tracks instructed to be reproduced is not an integral multiple of 3,
Finally you have to read the odd track. In other words, necessary data and unnecessary data are reproduced simultaneously during the last rotation, but unnecessary data is not stored because only necessary data is stored in the buffer memory. For example,
In FIG. 9, when there is an instruction to reproduce the tracks T1 to T4, the data for three tracks is reproduced in the first rotation and stored in the buffer memory 9. However, in the second rotation, only data for one track was required, and the data for the remaining two tracks was not stored in the buffer memory 9 even though the data was reproduced with great effort.

The present invention is effectively utilized by accumulating read unnecessary data in a cache memory without discarding the data, and outputting data from the cache memory in response to a subsequent reproduction instruction, thereby enabling optical data to be transmitted to an adjacent track. An object of the present invention is to provide an optical disk, an optical disk recording device, and an optical disk reproducing device that can transfer data immediately without performing a beam tracking operation. Further, when data is stored from a plurality of tracks to the cache memory, priority is set between the tracks so that high-priority data is stored in the cache memory, and the memory capacity is effectively used.

[0006]

In the optical disk according to the first aspect of the present invention, nxm tracks are formed by n spirals, and each of the n tracks constitutes one track bundle, and m track bundles. , N, the track priority of data recording in the track bundle is set in the order of tracks 1, 2,..., N, and the track bundle priority of data recording between the track bundles is track bundle 1 , 2,..., M, and when data is recorded over a plurality of tracks, data is recorded based on the track priority, and data is recorded over a plurality of track bundles. In this case, the data is recorded with the track bundle priority being prior to the track priority.

[0007] The optical disk recording apparatus according to claim 2 is
An n × m track is formed by the n spirals, and each n tracks is a single track bundle. In an optical disc recording apparatus that records data on an optical disc composed of m track bundles, Track priority of data recording is track 1, 2, ...
, N are set, and the track bundle priorities for recording data between the track bundles are the track bundles 1, 2, 2,
.. Are set in order of m, and when data is recorded over a plurality of tracks, data is recorded based on the track priority, and when data is recorded over a plurality of track bundles, Recording order determining means for determining the recording order of tracks by prioritizing the track bundle priority over the track priority, and recording means for recording data based on the recording order output from the recording order determining means. And characterized in that:

[0008] An optical disk reproducing apparatus according to claim 3 is
An optical pickup that simultaneously reads n adjacent tracks on an optical disk and independently outputs the read signals for each track, and independently reproduces data for each track from the signal output from the optical pickup; An optical disc reproducing apparatus having a reproducing circuit for reproducing data from a plurality of tracks reproduced by the reproducing circuit and a memory means for storing data of a plurality of tracks reproduced from the n tracks by the reproducing circuit. A cache memory for storing unnecessary data that has not been stored, and, when storing the unnecessary data in the cache memory, storing the unnecessary data while setting the track priority of n tracks in the order of tracks 1, 2,. Cache memory control means, and a transfer of the unnecessary data stored in the cache memory. A memory management table that holds the address information of the disk and the track priority, and checks whether or not the track for which reproduction has been instructed is registered in the memory management table. And playback control means for outputting the data stored in the storage device and omitting the playback operation from the disk.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining an optical disk of the present invention. On the optical disc, tracks are formed by n (n ≧ 2) spirals T1 to Tn, and the total number of tracks is n × m (m ≧ 2). Further, n tracks corresponding to one set of spirals are regarded as one track bundle, and the total of F1 to Fm is a m bundle of tracks.
Therefore, an arbitrary track can be represented by (F _i , T _j ) (where i = 1, 2,..., M, j = 1,
2, ..., n). In the present embodiment, assuming that n = 3, tracks of the optical disc 1 are formed by three spirals T1 to T3, and the optical disc 1 has a total of 3 × m tracks.
For example, continuous data such as music information and video information and continuous data having a large file capacity are recorded by imprinting uneven pits on tracks of the disk.

When recording continuous data over a plurality of tracks of the optical disc 1, the priority of data recording in the track bundle Fi is track T.
The tracks are set in the order of 1, T2, and T3, and the track with the highest priority is T1 and the track with the lowest priority is T3. Also, when recording over multiple track bundles,
The priority of data recording between the track bundles is set in the order of the track bundles F1, F2,..., Fm, the track bundle with the highest priority is set as the track bundle F1, and the track bundle with the lowest priority is set as the track bundle. Fm. If the continuous data is not well separated and the immediately preceding continuous data ends at the track (F _i , T ₁ ), the head of the recording must be set to T2 instead of the track T1. Therefore, data is sequentially recorded on the empty tracks with the track bundle priority being prior to the track priority. This gives (F _i ,
From T ₂ ), the next continuous data is sequentially recorded, no empty track is generated, and the recording area can be effectively used.

FIG. 2 is a diagram for explaining an optical disk recording apparatus for recording continuous data on the optical disk. If the optical disc 1 is a read-only optical disc in which continuous data is imprinted by the pits having irregularities as described above, a master disc of the optical disc can be recorded by the optical disc recording apparatus, and a large number of optical discs can be copied. If the optical disk 1 is a rewritable disk such as a magneto-optical disk or a phase-change disk, the track is engraved in advance as a guide groove, and continuous data is recorded by the optical disk recording device. The recording method of the continuous data is the same for both types of disks.

A track formed by a plurality of spirals on the optical disk 1 is irradiated with a light beam from the optical pickup 5 to record continuous data. Even if this light beam is a single beam, if recording is performed while sequentially performing track jumps, recording can be performed on different spirals, so that recording can be performed on all tracks. However, by having three light beams b1 to b3 of the same number as the spiral as shown in the figure, the recording speed is tripled, and the jump operation is not required.
The following describes this example.

In FIG. 2, when the host interface 10 receives an instruction to record continuous data on the optical disc 1 from the host device via the terminal 11, the controller 12 performs a recording operation by issuing an instruction to each unit. First, the optical disk 1 is rotated by the spindle motor 2, and the optical disk 1 is irradiated with three light beams b 1 to b 3 from the light emitting elements 31 to 33 in the optical pickup 5. The feed motor 6 moves the optical pickup 5 based on an instruction from the controller 12, and records spirals T1 to T
3, light beams b1 to b3 are positioned. Recording data d0
Is input to the buffer memory 101, and is divided into a plurality of blocks for recording on a track-by-track basis by the recording order determining means 102 in the following manner. Then, the recording order of the blocks is determined, and the recording circuits 103 to 105 sequentially record the blocks. Recorded on the track.

FIG. 3 is a diagram showing a method of dividing continuous data into a plurality of blocks for recording. First, the continuous data is divided into a plurality of blocks B1 to Bk. The capacity of one block corresponds to the capacity of one track. For example, it is assumed that the recording of the immediately preceding continuous data has been completed on the track T1 of the track bundle Fi. Then, it becomes the first track (F _i , T ₂ ) of the recording, but if the recording data amount is large, it is necessary to record over a plurality of track bundles. At this time, the next block B2 is recorded on the track (F _i , T ₃ ). When there are three light beams, these two blocks B1 and B2 are recorded first by the light beams b2 and b3. The light beam b1 does not record. Optical disk 1
Makes one rotation, then using the light beams b1 to b3,
Blocks B3 to B5 are assigned to tracks (F _{i + 1} , T ₁ ) to (F
_{i + 1} , T ₃ ). Thereafter, recording is performed in order, and the last block Bk is recorded on the track (F _j , T ₂ ). This completes the recording of the continuous data. When recording the next continuous data, recording is performed from the track (F _j , T ₃ ).
As described above, when the immediately preceding continuous data ends in the middle of the block bundle, the data is recorded with the track bundle priority prior to the track priority. As a result, recording is performed sequentially from the middle track of the track bundle, and the recording area can be effectively used without generating an empty track.

FIG. 4 shows the structure of the above optical disk recording apparatus.
6 is a flowchart showing an operation when recording continuous data. First, the recording data is fetched from the host interface and stored in the recording buffer memory (S41). The recording order determining means divides the data into blocks (S42). The order of tracks for recording each block is determined (S43). The recording circuit reads the data of each block from the recording buffer memory and records the data on the assigned track (S44).

Next, an embodiment of an optical disk reproducing apparatus for reproducing the optical disk 1 recorded by the optical disk recording apparatus will be described with reference to FIG. First, when the host interface 10 receives an instruction to reproduce the continuous data on the optical disk 1 from the host device via the terminal 11, the controller 12 performs a reproducing operation by issuing an instruction to each unit. First, the optical disc 1 is rotated by the spindle motor 2, and the feed motor 6 is controlled to position the optical pickup 5 in the spirals T1 to T3. Optical disk 1
The upper spirals T1, T2, and T3 are irradiated with laser beams b1 to b3 from the semiconductor lasers 31, 32, and 33, respectively, and the reflected lights are converted into electric signals by the light receiving elements 41, 42, and 43. , 72, 73 independently. The data independently reproduced for each spiral is temporarily stored in the cache memory 13 via the cache memory control circuit 8, and then sent from the terminal 11 of the host interface 10 to the host device. The memory management table 14 stores management information corresponding to the data of each track stored in the cache memory 13. The cache memory 13 and the memory management table 14 are controlled by the controller 12 and a cache memory control circuit.

A method of reproducing data recorded on a plurality of tracks in the above-described optical disk reproducing apparatus will be described with reference to FIG. As described above, the leading track of the recording is the track (F _i , T ₂ ) and is recorded over a plurality of track bundles because of the large amount of recording data. 3
Among the light beams of the book, first, the block B1 recorded on the track (F _i , T ₂ ) by the light beams b2 and b3.
And the block B recorded on the track (F _i , T ₃ )
Play 2 The light beam b1 does not perform reproduction. When the optical disk 1 rotates once, the light beams b1 to b3
Is used to track blocks B3 to B5 (Fi _{+ 1} ,
Reproduction is performed from T ₁ ) to (F _{i + 1} , T ₃ ). Thereafter, reproduction is performed in order, and the last block Bk is reproduced from the track (F _j , T ₂ ). Thus, the reproduction of the continuous data ends.
When reproducing the next continuous data, the track (F _j ,
The reproduction operation can be omitted by not starting reproduction from T ₃ ) and storing the block B1 ′ extraly read from this track in the cache memory as described later.

FIG. 6 is a schematic diagram showing the correspondence between the cache memory 13 and the memory management table 14. The cache memory 13 is divided into, for example, ten storage areas ar1 to ar10, and block data for one track is stored in each area. On the other hand, the memory management table 1
4 is track address information ad1 to ad10, flag information fl1 to fl10, and priority information pr1 to pr.
10 are stored, each of which corresponds to an area ar1 to ar10 of the cache memory 13. When data is stored in the cache memory 13, addresses indicating the tracks are stored in ad1 to ad10. If the data in the cache memory is transferred to the host computer, the flag information of the transferred area becomes [0], and if not, it becomes [1].
That is, when the flag information is [1], the data needs to be left in the cache memory, and when the flag information is [0], there is no need. Further, as will be described later, priority information in which the priority is higher as the position is closer to the head block of the continuous data is stored in the memory management table. by this,
As the cache memory fills with data,
Data closer to the head block can be preferentially stored in the cache memory. Thus, during access of the optical pickup, the leading block data can be preferentially transferred from the cache memory to the host computer, and the access time can be apparently improved.

FIG. 7 is a flowchart showing the flow of a reproducing operation in the above-mentioned disk reproducing apparatus. First, a reproduction instruction of the tracks (Fi, T2) to (Fj, T2) is given from the host computer to the controller via the host interface (S1). The controller first checks whether the track number (Fi, T2) for which reproduction has been instructed exists in the memory management table, from among the flag information indicating that data is stored in the cache memory being [1] (see FIG. 4). S2). It is determined whether or not the data of the track (Fi, T2) instructed to be reproduced exists in the cache memory (S3). If it exists in the cache memory, the process of S7 is performed, and if it does not exist, the process of S4 is performed. In the example of FIG. 3, it is determined that the tracks (Fi, T2) and (Fi, T3) exist in the cache memory, and the process proceeds to S7. Next, because it is not the last block,
Performs processing of the next track, the process proceeds to again S3, S4, it is determined that the track _{(F i + 1, T 2} ) is absent, the optical pickup is accessed to the three tracks adjacent the track (S4) . The three tracks of data are simultaneously reproduced by three multi-beams and stored in the corresponding blocks of the cache memory (S5). The track number, the flag information, and the priority information in the memory management table are updated (S6). It is determined whether or not the processing has been completed for all the tracks for which reproduction has been instructed. If not, the process returns to S2 to perform the processing for the next track (S2).
7). On the other hand, if the processing has been completed for all the tracks, the data of the reproduction instruction track stored in the cache memory is transferred to the memory control circuit 8 by the instruction of the controller.
Then, the data is transferred from the terminal 11 to the host via the host interface 10 (S8). The host is notified of the end of the reproduction process (S9).

Once the cache memory becomes full by the above operation, new data having a high priority is stored while erasing unnecessary data by the following method. The controller refers to the memory management table and searches for an area of the cache memory in which the flag information is [0], that is, invalid. If there is an invalid area, the block data and the newly stored block data are exchanged and stored. If there is no invalid area, block data having a lower priority is searched for by the following method. Track priority is T1, T
2, and T3. Similarly, the priority order of the track bundles is set in the order of the track bundles F1, F2, and Fm.
In consideration of the fact that the head of recording is in the middle of the track bundle, the track bundle priority is set prior to the track priority. According to this rule, the priority information is stored in the memory management table so that the head block of the continuous data has a higher priority and the tail block has a lower priority. By replacing with new data based on this priority information, the last block is more likely to be replaced with new data, and the first block of continuous data is left in the cache memory as the first priority. As described above, when data is stored in the cache memory, the priority information is written in the memory management table together with the address information indicating the track number, and the flag information corresponding to the stored area is set to [1], thereby enabling continuous data storage. The first block of the data can be left in the cache memory as the first priority, and by reading this data during access, the access time can be shortened in a pseudo manner.

FIG. 8 is a diagram showing the contents of the cache memory and the memory management table stored according to the above flowchart. Already, some continuous data has been played,
Description will be made from the state (a) where the cache memory is full. The data stored in the cache memory is
As shown in the memory management table, the flag information [0] and [1] can be distinguished from the priority information by [1], [2],. Data that has already been sent to the host has flag information of [0], and data that has not been sent has [1]. In addition, since the priority is higher as the data is closer to the head block in one continuous data, for example, the head block has priority information [1], and the subsequent blocks have [2]. When the controller receives a reproduction instruction from the host, it first searches for an area that is the flag information [0], and transfers the reproduced data to the host using this area as a buffer. When data is sequentially transferred, blocks not sent remain in the cache memory because the flag information is [1].

By repeating the reproduction of some continuous data,
As shown in (b), there is no longer an area where the flag information is [0], and all of the areas become [1]. In this state,
Since there are three light beams, only the priority information [1] and [2] remain. Next, the controller searches for a low priority (in this case, [2]), and similarly transfers data to the host using this area as a buffer. When the data is sequentially transferred, the unsent block remains in the cache memory because the priority information is [1]. Repeating the playback of some more continuous data,
Eventually, only the area whose priority information is [1] will remain,
As shown in (c), the one with a higher priority can be left in the cache memory. In addition, since it also has the role of a buffer memory that transfers data to the host computer,
Actually, the area where the flag information is [0] and the area where the priority information is other than "1" are secured at the minimum, but only the area of the cache memory is described for convenience of explanation. When all pieces of priority information become [1], data may be rejected in ascending use order.

In the above description, the embodiment using three light beams has been described. However, the present invention is not limited to this, and the same applies to the case where four or more spirals are irradiated with a multi-beam. Applicable.

[0024]

According to the optical disk, the optical disk recording device and the optical disk reproducing device described above, continuous data over a plurality of tracks is recorded on the optical disk while determining the recording order on the tracks, and the data is reproduced from the optical disk. At this time, unnecessary data other than the reproduction instruction is stored in the cache memory without being discarded, and data is output from the cache memory in response to a subsequent reproduction instruction. Thus, data can be transferred immediately without performing a light beam tracking operation to an adjacent track. Further, when data is stored from a plurality of tracks to the cache memory, a priority is set between the tracks. As a result, high-priority data can be stored in the cache memory, and the memory capacity can be effectively used.

[Brief description of the drawings]

FIG. 1 is a diagram showing an optical disk of the present invention.

FIG. 2 is a diagram showing an optical disk recording device of the present invention.

FIG. 3 is a diagram showing the order of recording by the optical disk recording device of FIG. 2;

FIG. 4 is a flowchart of a recording operation in the optical disc recording device of FIG. 2;

FIG. 5 is a diagram showing an optical disk reproducing device of the present invention.

FIG. 6 is a diagram showing a configuration of a cache memory and a memory management table in FIG. 5;

FIG. 7 is a flowchart of a reproducing operation in the optical disk reproducing device of FIG. 5;

8 is a diagram illustrating the contents of a cache memory and a management table that are rewritten according to the flowchart of FIG. 5;

FIG. 9 is a configuration diagram of a disc reproducing apparatus for explaining a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 spindle motor 31, 32, 33 light emitting element 41, 42, 43 light receiving element 5 optical pickup 6 feed motor 71, 72, 73 reproducing circuit 8 cache memory control circuit 10 host interface 11 terminal 12 controller 13 cache memory 14 memory management Table 101 Recording buffer memory 102 Recording order determination means 103, 104, 105 Recording circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 7/24 561 8721-5D G11B 7/24 561B (72) Inventor Shigemi Maeda Osaka-shi, Osaka (22) Inventor Yoshihiro Sekimoto, 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (3)

[Claims] 1. An n × m track is formed by n spirals, and each of the n tracks is regarded as one track bundle, and in an optical disc composed of m track bundles, data recording in the track bundle is performed. , N are set in the order of tracks 1, 2,..., N, and the track bundle priorities of data recording between the track bundles are set in the order of track bundles 1, 2,. When data is recorded over a plurality of tracks, data is recorded based on the track priority, and when data is recorded over a plurality of track bundles, the data is more than the track priority. An optical disc characterized in that data is recorded with the track bundle priority being set first. 2. An optical disk recording apparatus for forming n × m tracks by n spirals, each of the n tracks as one track bundle, and recording data on an optical disk composed of m track bundles. The track priority of data recording in the track bundle is set in the order of tracks 1, 2,..., N, and the track bundle priority of data recording between the track bundles is track bundle 1, 2,. , M, and when data is recorded over a plurality of tracks, data is recorded based on the track priorities,
When data is recorded over a plurality of track bundles, a recording order determining unit that determines the recording order of the tracks by prioritizing the track bundle priority over the track priority, and outputting the data from the recording order determining unit. Recording means for recording data on the basis of the set recording order. 3. An optical pickup for simultaneously reading n adjacent tracks on an optical disk and independently outputting the read signals for each track, and extracting data for each track from the signals output from the optical pickup. In an optical disc reproducing apparatus having a reproducing circuit for independently reproducing data and a memory means for storing data of a plurality of tracks reproduced by the reproducing circuit, the optical disc reproducing device comprises: A cache memory for storing unnecessary data for which a reproduction instruction has not been issued, and, when storing unnecessary data in the cache memory, setting the track priority of n tracks in the order of tracks 1, 2,. Cache memory control means for storing unnecessary data; A memory management table that holds the address information of the track of the data required and the track priority order, and checks whether or not the track for which the reproduction instruction has been made is registered in the memory management table. An optical disc reproducing apparatus comprising: a reproduction control unit that outputs data stored in the cache memory and omits a reproducing operation from a disc.