JPH0388125A - Recording medium, information recording and reproducing method - Google Patents

Abstract

PURPOSE:To increase the recording capacity of a medium by recording and forming reproduction-only information by displacement in track width direction, and recording main information by using part of the reproduction-only information. CONSTITUTION:The method is employed such that the magneto-optical recording of the main information on the recording track 11 of a magneto-optical disk 10 is performed along a tracking direction. The reproduction-only information is recorded and formed on the track 11 by the displacement in the track width direction. Recording can be performed extending over entire plane of the disk 10, and control information consisting of a synchronizing signal and a clock signal component in the reproduction- only information is recorded on each frame leading part of a frame which forms a recording unit extending over the entire area of the disk by the displacement in the track width direction. When the recording/reproduction of the main information is performed by using the recording medium, the control information can be used. Also, since it is not required to record the control information newly when the main information is recorded, the main information can be recorded by omitting the control information. Therefore, the recording capacity can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to a recording medium, an information recording method, and an information reproducing method, and in particular, main information recorded in the track direction on a preformed recording track. The present invention relates to a recording medium on which other read-only information is recorded and formed by displacement in the track width direction, and an information recording method and an information reproducing method for the recording medium.

B0 Summary of the Invention The present invention records and forms read-only information by displacement in the track width direction in a recording medium in which main information is recorded along the track direction on a pre-formed recording track, and forms part of the read-only information. By making it possible to record the above-mentioned main information using the track width direction, it becomes possible to record not only the main information but also information by displacement in the track width direction, thereby increasing the recording capacity of the medium. The main information can be accessed during recording by displacement in the track width direction. When recording main information along the track direction using a part of the read-only information using a recording medium on which such read-only information has been previously recorded and formed by displacement in the track width direction, the main information to be recorded is The recording capacity of the medium can be further increased by reusing a part of the read-only information previously recorded by displacement in the track width direction without recording a part of the information.

Furthermore, if the recording density of the main information and the recording density of the read-only information are made the same, it is possible to obtain approximately twice the recording capacity, and it becomes easier to synchronize these pieces of information. Furthermore, when reproducing main information using a recording medium on which reproduction-only information is prerecorded by the displacement in the track width direction as described above, the main information may be reproduced using a part of the reproduction-only information. This makes it possible to make part of the main information unnecessary. At this time, if the recording density of the main information and the recording density of the read-only information are the same, it becomes easier to synchronize these pieces of information.

C0 Conventional technology In a recording medium capable of recording information, such as a magneto-optical disk, a tracking guide groove is formed in advance in a spiral or concentric shape on the disk. It is known that information is recorded and reproduced using the magneto-optical effect along the track direction on the recording track, using the land area between the groups or groups as a recording track. This records and reproduces information magneto-optically while optically detecting the guide groove and applying tracking servo.

In this case, it is known that control information such as synchronization signals and addresses and data are alternately recorded on the recording track, and data management etc. are performed based on this control information. Data is recorded and played back in blocks or frames depending on the information.

By the way, it would be convenient for manufacturers to supply software and for users to use it if playback-only data such as operating systems and basic dictionaries could be supplied in a pre-recorded form on the recordable medium. Recording media, such as disks and cards, on which information can be recorded and read-only information (ROM information) is written in advance have been proposed and developed.

FIG. 4 shows an example of a magneto-optical disk as a recording medium on which such read-only data is prerecorded.

In FIG. 4, the magneto-optical disk 1 is provided with a so-called RAMwi area 2 in which signals can be recorded, and a so-called ROMfiI area 3 dedicated for reproduction. R.A.
In the M fiI area 2, a land portion within a pre-formed guide groove (pre-group) or between groups is used as a recording track 4, and information is magneto-optically recorded on this recording track 4. The ROM tIi area 3 is provided with a track 5 on which reproduction-only information is previously recorded in the form of bits (so-called preformat).

D3 Problems to be Solved by the Invention However, since such a magneto-optical disk 1 is divided into a recordable RAM fii area 2 and a read-only ROM jI area 3, the information recording capacity of the entire disk surface is limited. RAM area 2 and ROM? tI area 3, and if the recording capacity of RAM area 2 is increased, the ROM
The recording capacity of the fil area 3 decreases, and conversely, when the recording capacity of the ROM area 3 increases, the recording capacity of the RAM area 2 decreases.

In addition, the main information recorded in RAM 6N area 2 must include control information such as synchronization signals and address information to facilitate access during recording/playback. In the case of a format in which frame synchronization is performed every 588T per frame (T is the channel bit period) according to the format, as shown in Fig. 4, a 24T synchronization signal containing a pattern of two consecutive 11T inversion intervals is used. A subcode part of 14T is provided at the beginning of each frame through a 3T connection bit, and the remaining 544T becomes the original data (including parity etc.) through a 3T connection bit. For this reason, 447 out of 588T of one frame cannot be used for original data recording, and the disk recording capacity is divided into 447 out of 588T of one frame.

The present invention has been made in view of the above circumstances, and provides a recording medium, an information recording method, and an information reproducing method that can increase the information recording capacity of a recordable recording medium on which reproduction-only information is prerecorded. The purpose is to provide the following.

80 Means for Solving the Problems In order to solve the above-mentioned problems, a recording medium according to the present invention is a recording medium in which main information is recorded along the track direction on a recording track formed in advance. Reproduction-only information is recorded and formed on the recording track by displacement in the track width direction, and a part of the reproduction-only information is used to record the main information, and the reproduction-only information includes at least a synchronization signal. Control information including the above is recorded over the entire area of the medium by the displacement in the track width direction, either discretely or continuously.

Further, in the information recording method according to the present invention, in the information recording method in which main information is recorded along the track direction on a recording track formed in advance on a recording medium, reproduction-only information is recorded on the recording track by displacement in the track width direction. The above problem is solved by using a pre-recorded recording medium and recording the main information using a part of the read-only information. Here, when recording the main information along the track direction on the recording track, a part of the information to be recorded is not recorded, and the read-only information recorded in advance by the displacement in the track width direction is recorded. A part of the information may be used as the information to be recorded, or the recording density of the main information may be the same as the recording density of the read-only information recorded in advance by the displacement in the trunk width direction.

Further, in the information reproducing method according to the present invention, in the information reproducing method for reproducing a recording medium in which main information is recorded along the track direction on a recording trunk formed in advance on the recording medium, reproduction-only information is provided in the recording track. The above-mentioned problem is solved by using a recording medium on which information is recorded in advance by displacement in the track width direction, and by reproducing the main information using a part of the reproduction-only information. At this time, the recording density of the main information may be the same as the recording density of the read-only information recorded in advance by the displacement in the track width direction.

Here, the reproduction-only information includes not only original data such as software programs, dictionary data, audio data, and video data, but also control information such as synchronization signals, clock signal components, and address information.

F5 Effect According to the recording medium according to the present invention, it is possible to record not only the main information recorded on the recording track along the track direction, but also information by displacement in the track width direction, thereby increasing the recording capacity of the medium. The main information can be accessed during recording by displacement in the track width direction.

When main information is recorded along the track direction using a part of such read-only information, the part of the above-mentioned read-only information is used as part of the main information to be recorded and recording is omitted. Accordingly, the medium recording capacity for original data can be further increased. Furthermore, if the recording density of the main information and the recording density of the read-only information are the same, approximately 2
Not only can double the recording capacity be obtained, but also it becomes easier to synchronize these pieces of information. Furthermore, when reproducing the main information using such a recording medium, a part of the main information can be made unnecessary by reproducing the main information using a part of the reproduction-only information. If the recording density of the main information and the recording density of the read-only information are the same, then the standard recording units such as sectors have the same length, making it easier to synchronize each piece of information.

G. Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows, as an embodiment of the recording medium according to the present invention, a magneto-optical disk 10 in which, for example, a perpendicularly magnetized film having a magneto-optic effect is formed on a transparent substrate. In this magneto-optical disk 10, a guide groove for tracking is formed in advance in a spiral shape or a concentric shape. A land portion within the pre-formed guide groove (pre-group) or between the groups is used as a recording track 11, and main information is magneto-optically recorded on this recording track 11 along the track direction. In this recording track 11, reproduction-only information is stored in the track width direction (
The recording is formed by a shift in the trunk width direction or a track width direction modulation.

This track width direction displacement recording information is extracted as a high frequency component of a so-called tracking error signal, but this track width direction displacement frequency is sufficiently higher than the tracking error signal frequency and does not have any adverse effects on the tracking error signal itself. It does not have any effect on

Here, the entire surface of the magneto-optical disk 10 is recordable, and at the beginning of each frame serving as a recording unit, control information that is controlled from the synchronization signal and clock signal components of the above-mentioned reproduction-only information is stored on the disk. Recording is performed over the entire area by the displacement in the track width direction. Further, in a part of this magneto-optical disk 1O, original data such as software programs such as an operating system, dictionary data, audio data, video data, etc. are transferred to the control information of each frame by displacement in the track width direction. are recorded in advance in succession.

In this way, the magneto-optical disk IO has a recording-only area 12.
and an area 13 in which read-only data is written in advance by displacement in the track width direction, and information (main information) can also be recorded in the track direction.

Note that for the entire area of the magneto-optical disk 10, area 13
You can also write playback-only data like this. Main information to be recorded, for example, magneto-optically along the track direction of the recording track 11, may include control information such as a frame synchronization signal, but such control information may be recorded along the track width direction displacement. It may be omitted (not recorded) considering that it can be obtained from the reproduction-only information.

Here, FIG. 2 shows an example of a recording format of reproduction-only information recorded by the displacement in the track width direction.

In FIG. 2, a specific example of an information recording format based on displacement in the track width direction is similar to the format of a so-called CD (compact disc). In other words, in the -a CD format, one block (one sector), which is the unit of information recording, consists of 98 frames from frame 0 to frame 97;
The frame is 588 times the channel clock period T (58
8T), each frame is provided with recording areas for a frame synchronization signal, subcode, and data (including parity). In other words, at the beginning of one frame, there are 2
A frame synchronization signal of 4T (24 channel bits) and a subcode area of 14T are provided, and these are connected via 3T connection bits, leaving 544 channel bits.
In T, 32 symbols (32 bytes) of sample data and parity data are so-called E F M (ill-1
4Rg4) system. The frame synchronization signal has a so-called out-of-rule pattern, which is not found in the EFM method, due to two consecutive IIT inversion intervals. The 14T subcode area corresponds to one symbol.

Here, as the recorded information based on the above-mentioned width direction displacement in the specific example of FIG. The 44T at the beginning of the frame includes a 14T subcode and a 3T connection bit through the connection bit. The synchronization signal at the beginning of this frame is for frame-by-frame synchronization, but if there are multiple frames (98)
In order to achieve synchronization in units of blocks (sectors) that are assembled together, a predetermined portion of the first 44T, for example 8T at the end, is used as a sector mark (block mark) for block synchronization. In other words, a track width direction displacement pattern that rises at the center of 8T is written as the sector mark of the first frame of the block, and a pattern that falls at the center of 8T is written for the sector marks of other frames. This allows the first frame of the block to be distinguished from other frames. Or, similar to the CD format, out-of-rule EFM modulation is applied to each subcode area of the first and second frame of the block.
The patterns So and S+ may be written in advance. At this time, the data of 8 bits before modulation (14 channel bits after modulation) in the subcode area is 9 bits.
One block is made up of 8 frames, and the first 27
It is also possible to configure eight channels P-W of 96 bits each, excluding one frame, and use the Q channel to express address information for minutes, seconds, and frames.

Such control information is recorded over the entire area of the magneto-optical disk IO (discretely at the beginning position of each frame) with displacement in the track width direction. Regarding playback-only data, out of 588 T (588 channel bits) in one frame, 544 bits other than the above 44 T at the beginning of the frame
By recording in the data area T by the displacement in the track width direction, the partial area 13 of the magneto-optical disk 10 is
We are trying to form a As the modulation method and recording density of the read-only data recorded by this displacement in the track width direction, for example, the modulation method of the CD format (E
The modulation method is the same as that of FM), and the recording density is the same as that of the main information on the recording track. Note that this modulation method is not limited to the EFM method described above, and a PE method, a pi-phase mark modulation method, or the like may be adopted, and the recording density can also be set arbitrarily.

Furthermore, it goes without saying that such reproduction-only original data may be recorded with displacement in the track width direction on the entire recording track 11 of the magneto-optical disk IO.

Using a recording medium on which such reproduction-only information is pre-recorded (preformatted) by displacement in the track width direction,
When recording/reproducing the main information on the recording track along the track direction, control information such as the frame synchronization signal obtained from the reproduction-only information can be used. Furthermore, when recording this main information, since there is no need to newly record the above control information, this control information is omitted, that is, as shown in the magneto-optical recording pattern in each recording track 11 in FIG. It is possible to perform magneto-optical recording of only the original data as main information along the track direction on the recording track 11 without recording a synchronization signal or the like at the beginning of each frame. As a result, the proportion of original data in the main information can be increased, and the recording capacity of the original data can be increased.

Furthermore, since playback-only information is pre-recorded (so-called pre-format) by displacement in the track width direction rather than conventional pit recording, tracking control over the entire area of the disc can be performed uniformly, and tracking control switching is possible. etc., and also prevents the negative effects on tracking when recording playback-only information in bits, improving the responsiveness and stability of tracking control operations when track jumps across each area 12.13. In good condition.

In this way, media such as optical disks in which read-only information is preformatted by widthwise displacement of the recording track itself can be easily mass-produced through a pressing process using a master disk or stamper during disk manufacturing. .

Next, we will discuss the recording method of the read-only information recorded and formed by the displacement in the track width direction as described above, such as the modulation method, error correction method, data format, and address format, and the recording method of the information recorded along the track direction on the recording trunk. A specific example of a recording/reproducing apparatus for recording/reproducing information using a magneto-optical disk, which is a recording medium that uses the same recording method for main information, will be described with reference to FIG.

In FIG. 3, the magneto-optical disk 10 has two types of areas 12 and 13 as described above, and an overall spiral or concentric recording track is formed.
In the OMH area, read-only information is recorded and formed by displacement in the track width direction. This magneto-optical disk lO is
It is designed to be rotated by a spindle motor 21 at a constant linear velocity (CLV) or a constant angular velocity (CAV). A laser beam from a laser light source 22 (laser diode, etc.) for recording/reproducing is converted into a parallel light beam by a collimator lens 23, and then sent to a beam splitter 24.
, the so-called 2 for focusing and tracking
The light is irradiated onto the magneto-optical disk 10 via the objective lens 25 of the axis device. The reflected beam from this magneto-optical disk IO is separated by a beam splitter 24 and divided into 1/2
The light enters a polarizing beam splitter 27 via an optical system 26 such as a wave plate, a converging lens, and a cylindrical lens.

The polarizing beam splitter 27 separates the light into a so-called P polarized light component and an S polarized light component, and the light is input to photodetectors 28 and 29 for detecting a tracking error signal, a focus error signal, and a magneto-optical signal (MO multiplied signal).

The outputs from these photodetectors 2B and 29 are sent to a differential amplifier 30 and the difference is taken to extract the magneto-optically recorded information signal (MO multiplied signal.The output signal from the differential amplifier 30 is The signal is sent to the selected terminal a of the changeover switch 31.

The photodetector 28 also detects a tracking error signal and a focus error signal using, for example, an element whose light receiving section is divided into four parts, and the high-frequency component of this tracking error signal is recorded by the displacement in the track width direction. It is possible to obtain a signal of reproduction-only information. This track width direction displacement recording signal is sent to a PLL/timing generation circuit 32, where clock reproduction and various timing signal generation are performed. Further, the track width direction displacement recording signal is sent to the selected terminal of the changeover switch 31. The output signal from the changeover switch 31 is subjected to EFM demodulation, for example, in a demodulation circuit 33, and then sent to an address decoder 3.
4 and an error correction code decoding circuit 35. The data whose errors have been corrected by the decoding circuit 35 is taken out from the data output terminal 37 via the data output circuit 40.

As described above, depending on whether the information to be reproduced is reproduction-only information recorded in advance by displacement in the track width direction or main information recorded on the recording track along the track direction, for example, the PLL timing By controlling the changeover switch 31 with a changeover control signal from the generation circuit 32, one system of demodulation circuit 33, address decoder 34, and error correction decoding circuit 35 is used for image information. Therefore, there is no need to provide a reproducing circuit system for each piece of information, and the reproducing circuit configuration can be halved. Note that when the respective addresses of the read-only information previously recorded by the displacement in the track width direction and the main information recorded on the recording track along the track direction are in the same format, the information can be distinguished as follows: What is necessary is to add identifier information or to differentiate using a so-called directory or TOC (Table of Contents).

Next, when recording information, the data of the main information to be recorded supplied from the data input terminal 41 is sent to the error correction code encoding circuit 42 via the data input/output circuit 40 and subjected to error correction encoding processing. The signal is then subjected to, for example, EFM modulation in a modulation circuit 43, converted into a magnetic field modulation drive signal in a magnetic field modulation drive circuit 44, and sent to a magnetic head 45 for magneto-optical recording.

Here, during the error correction encoding processing in the encoding circuit 42 and the EFM modulation processing in the modulation circuit 43, at least the reproduction-only information recorded in the track width direction displacement is determined according to the frame synchronization signal. A locked PLL clock signal controls each processing operation.

At this time, since the synchronization signal and the clock signal can be obtained from the read-only information recorded by the displacement in the track width direction, there is no need to include them in the main information to be recorded magneto-optically. Further, the address information can also be obtained from the reproduction-only information. From this,
By reusing the synchronization signal, etc. of playback-only information without recording this synchronization signal etc. as main information, it is possible to increase the proportion of original data in the main information, increasing the recording capacity of original data. can be done.

It should be noted that the present invention is not limited to the above embodiments, and for example,
In addition to magneto-optical disks, the recording medium can be applied to phase-change optical disks, organic dye-based optical disks, various write-once disks, overwritable disks, etc. In addition to disks, it can also be used for optical disks.

Further, software program data or the like may be recorded by the displacement in the track width direction. Furthermore, it goes without saying that the recording format of the trunk width direction displacement recording information is not limited to the specific example shown in FIG.

H0 Effects of the Invention As is clear from the above explanation, according to the recording medium of the present invention, read-only information is recorded by displacement in the track width direction, and a part of the read-only information is used to record the above-mentioned main information. By making it possible to record information, it becomes possible to record not only main information recorded on the recording track along the track direction, but also information by displacement in the track width direction, thereby increasing the recording capacity of the medium. Furthermore, the displacement in the track width direction facilitates access to unrecorded areas during main information recording.

Next, according to the information recording method according to the present invention, when main information is recorded along the track direction using a part of the read-only information recorded by displacement in the track width direction, the main information to be recorded is By using a portion of the reproduction-only information and omitting recording, it is possible to further increase the medium recording capacity for the original data. Also,
If the recording density of the main information and the recording density of the read-only information are made the same, it is possible to obtain approximately twice the recording capacity, and it becomes easier to synchronize these pieces of information.

Furthermore, according to the information reproducing method according to the present invention, when reproducing main information using a part of the reproduction-only information recorded by displacement in the track width direction, the main information is reproduced using a part of the reproduction-only information. By reproducing the information, a part of the main information can be made unnecessary, and if the recording density of the main information and the recording density of the read-only information are the same, the standard recording units such as sectors are of the same length. This makes it easier to synchronize each piece of information.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing a magneto-optical disk as an embodiment of a recording medium according to the present invention, FIG. 2 is a diagram showing a specific example of a recording format 7 in a read-only area of the disk, and FIG.
The figure is a bronch circuit diagram showing a specific example of a recording/reproducing apparatus for explaining an embodiment of the information recording method and information reproducing method of the present invention, and FIG. 4 shows an example of a conventional disc having a reproduction-only area. FIG. 0...Magneto-optical disk 1...Recording track l...Spindle motor 8.29...Photodetector 1...Switch switch 2...PLL/timing generation circuit 3...・
・Demodulation circuit 4 Address decoder 5 Error correction decoding circuit 2 Error correction encoding circuit 3 Modulation circuit

Claims (7)

[Claims] (1) In a recording medium in which main information is recorded along the track direction on a recording track formed in advance, reproduction-only information is recorded and formed on the recording track by displacement in the track width direction, and one part of the reproduction-only information is recorded on the recording track. 1. A recording medium configured to record the main information using a plurality of parts. (2) As the read-only information, control information including at least a synchronization signal is recorded and formed over the entire area of the medium by the displacement in the track width direction. 1) Recording medium described. (3) In an information recording method in which main information is recorded along the track direction on a recording track previously formed on a recording medium, a recording medium on which read-only information is previously recorded and formed on the recording track by displacement in the track width direction. and recording the main information using a part of the reproduction-only information. (4) When recording the main information on the recording track along the track direction, a part of the information to be recorded is not recorded, and the read-only information is prerecorded and formed by the displacement in the track width direction. 4. The information recording method according to claim 3, wherein a part of the information is used as part of the information to be recorded. (5) The recording density of the main information recorded on the recording track along the track direction is the same as the recording density of the read-only information recorded in advance by the displacement in the track width direction. The information recording method according to claim (3). (6) In an information reproducing method for reproducing a recording medium in which main information is recorded along the track direction on a recording track previously formed on the recording medium, reproduction-only information is previously recorded on the recording track by displacement in the track width direction. An information reproducing method characterized in that the main information is reproduced using a part of the reproduction-only information using the formed recording medium. (7) The recording density of the main information recorded on the recording track along the track direction is the same as the recording density of the read-only information recorded in advance by the displacement in the track width direction. The information reproducing method according to claim (6).