JPH0917052A - Disk-shaped recording medium and disk device using the same - Google Patents

Abstract

PURPOSE: To enable recording and reproducing operation possible by maintaining the specified transfer rate of data constant without lowering the rate. CONSTITUTION: The recording region of a disk 21 is divided to regions 22, 23. The regions 22, 23 are divided radially at equal intervals to blocks 22a to 22d, 23a to 23d. Spiral tracks heading toward an outer peripheral side from an inner peripheral side when the disk 21 rotates in a prescribed direction are formed in the region 22. reverse spiral tracks are formed in the region 23. The transfer rates of the blocks are made successively higher from the inner peripheral side to the outer peripheral side. The sum of the transfer rates of the blocks 22a, 23a, the sum of the transfer rates of the blocks 22b, 23b, the sum of the transfer rates of the blocks 22c, 23c and the sum of the transfer rates of the blocks 22d, 23d are set constant. Signal are divided according to the respective transfer rates and are recorded in the blocks where the sums of the transfer rates are constant. The signals from the blocks where the sum are constant are mixed according to the transfer rates. The recording and reproducing of the signals are executed the specified rates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped recording medium and a disc device using the same. Specifically, a recording area in the same plane having a spiral track is divided in the radial direction to form a plurality of blocks, and a plurality of areas formed by one or a plurality of continuous blocks are formed. The plurality of areas are composed of areas in which the spiral direction of the track is in one direction and areas in the other direction, and one area or a plurality of pairs of areas having different spiral directions are paired. It is possible to record a signal at a constant transfer rate by selecting blocks so that the sum of the transfer rates is constant from the area and distributing the recording signal according to the transfer rate of each block for recording. Is. In addition, a signal is read from a block in each area of a pair or a plurality of pairs where the recording signal is distributed and recorded to obtain a block reproduction signal for each area, and the block transfer signal of the read area is set to the transfer rate. By mixing the block reproduction signals accordingly, the signals can be reproduced at a constant transfer rate.

[0002]

2. Description of the Related Art As a conventional disc-shaped recording medium, for example, an optical disc, a so-called zone CAV type optical disc 10 in which a recording area is divided into a plurality of blocks in a radial direction as shown in FIG. 3A is known. Note that in FIG. 3A, the recording area 11 of the optical disk 10 has four blocks 1
It shows a case of being divided into 1a to 11d.

This zone CAV type optical disk 10
Is rotated by a spindle motor at a constant angular velocity to perform a recording / reproducing process. Since the recording / reproducing frequency of each block of the optical disk 10 is increased in order from the inner peripheral side block, the amount of data that can be recorded or reproduced per unit time (hereinafter referred to as "transfer rate") is As shown in 3B, the transfer rate is sequentially increased from the inner block to the outer block.

Here, when recording and reproducing image signals,
For example, when the image signal is a moving image signal, the display image is rewritten at a constant cycle, so it is desirable that the transfer rate of the image signal data be constant. Therefore, as shown in FIG. 4, a zone CAV type optical disc is attached. In this case, as one surface of the bonded optical disk 12 is formed with a spiral track extending from the inner peripheral side to the outer peripheral side when the optical disk 12 is rotated in a predetermined direction, the optical pickup 13a forms an inner peripheral surface. The data shall be read from the side. On the other side, when the optical disk 12 is rotated in a predetermined direction, a spiral track extending from the outer peripheral side toward the inner peripheral side is formed, and the optical pickup 1
It is assumed that data is read from the outer peripheral side by 3b.
By making the sum of the amounts of data read from both sides of the optical disc 12 by the optical pickups 13a and 13b constant, the data transfer rate is made constant.

[0005]

In the magneto-optical disk 15 of the magnetic field modulation type, an optical pickup 16 and a magnetic head 17 are arranged on the magneto-optical disk 15 as shown in FIG. In FIG. 5, the recording layer 15b on which data is recorded is the substrate 1 of the magneto-optical disk 15.
5a, and further on the recording layer 15b,
A protective layer 15c for protecting the recording layer 15b is formed. When data is recorded on the recording layer 15b, laser light is emitted from the optical pickup 16 provided on the substrate 15a side, and externally from the magnetic head 17 provided close to the protective layer 15c side. A magnetic field is applied. By controlling the external magnetic field from the magnetic head 17, the direction of magnetization of the recording layer 15b is switched and a signal is recorded.

When the magneto-optical disk 15 is bonded, since a substrate or the like is interposed between the recording layer and the magnetic head, it is possible to apply an external magnetic field of sufficient strength from the magnetic head to the recording layer. Can not. Therefore, the magnetization direction of the recording layer cannot be switched, and the signal cannot be recorded.

When signals recorded on the same surface are read out by two optical pickups at a constant transfer rate, the spiral direction of the track is constant, so that one optical pickup sequentially outputs signals from the inner circumference side. In addition to reading, it is necessary for the other optical pickup to perform a track jump each time one track is reproduced from the outer peripheral side and sequentially move the optical pickup from the outer peripheral side to the inner peripheral side. As described above, since the track jump of the optical pickup is performed, it takes time to read out the signal, and the transfer rate is low.

In view of this, the present invention provides a disk-shaped recording medium capable of recording / reproducing operation with a constant data transfer rate without lowering the data transfer rate, and a disk device using the same.

[0009]

DISCLOSURE OF THE INVENTION A disk-shaped recording medium according to the present invention has a recording area in the same plane having a spiral track, which is radially divided to form a plurality of blocks, and has a constant angular velocity. A disk-shaped recording medium in which the data transfer rate when rotated at a constant speed within a block and which increases from the inner circumference side block to the outer circumference side block is one or a plurality of consecutive blocks. A plurality of areas to be formed are formed, and each of the plurality of areas has an area in which the spiral direction of the track is in one direction and an area in the other direction.

In the disk device, areas in which the spiral direction of the disk-shaped recording medium is different are paired, and blocks are selected so that the sum of transfer rates is constant from one area or a plurality of areas. And a signal distribution unit for distributing a recording signal according to the transfer rate of the block selected by the signal recording unit and supplying the signal to the signal recording unit.

Further, the disk device reproduces signals from the blocks in each area of a pair or a plurality of areas where the recording signals of the disk-shaped recording medium are distributed and recorded to obtain a block reproduction signal for each area. And a signal mixing means for obtaining the same reproduction signal as the recording signal by mixing the block reproduction signal obtained by the signal reproduction means in accordance with the transfer rate of the block of each area from which the signal is read by the signal reproduction means. And have.

[0012]

In the disk-shaped recording medium according to the present invention, the recording area in the same plane having the spiral track is divided in the radial direction to form a plurality of blocks, and when rotated at a constant angular velocity. The data transfer rate is constant within the block and increases from the inner peripheral side block to the outer peripheral side block, forming a plurality of areas formed by one or a plurality of continuous blocks, The plurality of areas are areas in which the spiral direction of the track is in one direction and areas in the other direction. Therefore, for example, an area in one direction has a sequential transfer rate increase for each block, and an area in the other direction has a sequential transfer rate decrease for each block.

In the disk device, areas in which the spiral directions of the disk-shaped recording medium are different are paired, and blocks are selected so that the sum of transfer rates is constant from one area or a plurality of areas. Since the recording signal is distributed and recorded according to the transfer rate of the selected block, it is possible to record the signal at a constant transfer rate. Further, a signal is read from a block in each area of one or a plurality of pairs in which the recording signal is distributed and recorded, and the block reproduction signal obtained from the read signal is set to the transfer rate of the block in each area. Accordingly, the recording signals recorded on the disk-shaped recording medium can be reproduced at a constant transfer rate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disc-shaped recording medium according to the present invention will be described below with reference to the drawings.

The recording area of the magneto-optical disk 21, which is a disk-shaped recording medium, is divided into two areas, an inner peripheral area 22 and an outer peripheral area 23, as shown in FIG. 1A, for example. A region 24 is provided between the region 22 and the outer peripheral region 23. Further, the inner peripheral side region 22 is divided into four blocks 22a to 22d at equal intervals in the radial direction. Similarly, the outer peripheral side region 23 is also arranged at equal intervals 4 in the radial direction.
It is divided into two blocks 23a to 23d. In addition,
The four blocks in the inner circumferential side region 22 are blocks 22a, 22b, 22c, 22d in order from the inner circumferential side. The four blocks in the outer peripheral side area 23 are blocks 23a, 23b, 23c, and 23d in order from the outer peripheral side.

A spiral track extending from the inner peripheral side to the outer peripheral side when the magneto-optical disk 21 is rotated in a predetermined direction is formed in the inner peripheral side area 22. A spiral track is formed in the outer peripheral area 23 from the outer peripheral side toward the inner peripheral side when the magneto-optical disk 21 is rotated in a predetermined direction. No spiral track is generated in the area 24.

As shown in FIG. 1B, the transfer rate of each block in the inner peripheral side area 22 and the outer peripheral side area 23 is sequentially higher from the inner peripheral side block 22a to the outer peripheral side block 23a. . In addition, the inner peripheral area 2
2 is the sum of the transfer rates of the block 22a and the block 23a of the outer peripheral area 23 (R22a + R23a), and the sum of the transfer rates of the blocks 22b and 23b (R22b).
+ R23b), the sum of the transfer rates of the blocks 22c and 23c (R22c + R23c), and the sum of the transfer rates of the blocks 22d and 23d (R22d + R23d) are equal and constant.

Next, a magneto-optical disk device for recording / reproducing signals using this magneto-optical disk 21 will be described. FIG. 2 is a diagram showing the configuration of the magneto-optical disk device according to the present invention.

In FIG. 2, the data input signal DI which is a recording signal is supplied to the data distributor 32 via the interface circuit 31. A data distribution control signal DS is sent to the data distributor 32 from a system control unit 40 described later.
And the data input signal DI is distributed to the distribution input signal DA and the distribution input signal DB based on the data distribution control signal DS. The distribution input signal DA is supplied to the data modulator 33, and the distribution input signal DB is supplied to the data modulator 34. The signal distributor is composed of the data distributor 32 and the system controller 40.

In the data modulator 33, the supplied distributed input signal DA is modulated into a head signal WA. This head signal WA is supplied to the magnetic head drive unit 35. The magnetic head drive unit 35 generates a head drive signal HA based on the head signal WA and supplies it to the magnetic head 37. The magnetic head 37 is for applying a magnetic field to the inner peripheral region 22 of the magneto-optical disk 21.

Similarly, the data modulator 34 modulates the supplied distributed input signal DB into a head signal WB. The head signal WB is supplied to the magnetic head drive unit 36. In the magnetic head drive unit 36, the head drive signal HB is generated based on the head signal WB, and the magnetic head 38 is generated.
Supplied to The magnetic head 38 is for applying a magnetic field to the outer peripheral region 23 of the magneto-optical disk 21.

The system control section 40 generates a laser control signal LC for controlling a laser beam used for recording a signal on the magneto-optical disk 21 or reading a signal recorded on the magneto-optical disk 21. It The laser control signal LC is supplied to the laser driving units 41 and 42.

In the laser driving section 41, the laser control signal L
A laser drive signal LDA is generated based on C. The laser drive signal LDA is supplied to the optical pickup 43, so that the optical pickup 43 drives the magneto-optical disk 21.
Irradiation of laser light is performed on. This optical pickup 43
Is for irradiating the inner peripheral region 22 of the magneto-optical disk 21 with laser light and for generating a detection signal based on the reflected light from the magneto-optical disk 21.

Similarly, the laser drive section 42 generates a laser drive signal LDB based on the laser control signal LC. When the laser drive signal LDB is supplied to the optical pickup 44, the optical pickup 44 irradiates the magneto-optical disk 21 with laser light. The optical pickup 44 is for irradiating the outer peripheral region 23 of the magneto-optical disk 21 with laser light and for generating a detection signal based on the reflected light from the magneto-optical disk 21.

The signal recording means is composed of the above-mentioned magnetic heads 37 and 38, system control section 40, optical pickups 43 and 44, and the like.

In the optical pickup 43, the reflected light deviated from the magneto-optical disk 21 is incident on, for example, a Wollaston prism (not shown), which is a kind of birefringent prism, and the P component wave and the S component wave. The P component wave and the S component wave are respectively guided to a photodetector (not shown) and converted into a read signal. Further, the read signal is added to generate the light intensity signal PA, and the read signal is subtracted to generate the reproduction signal PC. The light intensity signal PA is supplied to the address extraction unit 45. Also,
The reproduction signal PC is supplied to the data signal generator 51.

Similarly, in the optical pickup 44, a light intensity signal PB is generated based on the shifted reflected light from the magneto-optical disk 21 and is supplied to the address extracting section 46.
Further, the reproduction signal PD is generated and supplied to the data signal generation unit 52.

The address signal extracting section 45 extracts a signal portion indicating the address information of the light intensity signal PA. The extracted signal SA is supplied to the address demodulator 47. The address demodulator 47 demodulates the extracted signal SA to generate the address signal AA. The address signal AA is supplied to the system control unit 40.

Similarly, the address signal extracting section 46 extracts a signal portion indicating the address information of the light intensity signal PB. The extracted signal SB is supplied to the address demodulator 48. The address demodulator 48 demodulates the extracted signal SB to generate the address signal AB. This address signal AB
Is also supplied to the system control unit 40.

In the system control section 40, a data distribution control signal DS for controlling the distribution ratio of the data input signal DI based on the address signals AA, AB and a data mixing control signal for controlling the mixing ratio of demodulation signals DC, DD which will be described later. DM is generated. The data distribution control signal DS is supplied to the data distributor 32, and the data mixing control signal DM is supplied to the data mixer 55 as described above.

In the data signal generator 51, the reproduction signal PC
A data signal RC is generated based on
Supplied to The data demodulation section 53 demodulates the data signal RC into a demodulation signal DC. The demodulated signal DC that is the block reproduction signal is supplied to the data mixer 55.

Similarly, in the data signal generator 52, the data signal RD is generated based on the reproduction signal PD and supplied to the data demodulator 54. The data demodulation section 54 demodulates the data signal RD to obtain a demodulation signal DD. The demodulated signal DD which is this block reproduction signal is supplied to the data mixer 55 which is a signal mixing means.

The signal reproducing means is composed of the system control section 40, the optical pickups 43 and 44, the address signal extracting sections 45 and 46, the address demodulators 47 and 48, the data signal generating sections 51 and 52, and the like.

In the data mixer 55, the timing of the demodulation signal DC and the demodulation signal DD is adjusted and the signals are mixed based on the data mixing control signal DM supplied from the system control unit 40, and the same data as the data input signal DI is obtained. The output signal DO is generated. The data output signal DO, which is a reproduction signal, is supplied to an external device (not shown) via the interface circuit 56.

Next, the operation will be described. When the data input signal DI is recorded on the magneto-optical disk 21, the laser control signal LC output from the system control unit 40 is output.
Based on the above, the magneto-optical disk 21 is irradiated with laser light whose output level is in the reproduction mode from the optical pickups 43 and 44. Optical intensity signals PA and PB are generated by the optical pickups 43 and 44 based on the reflected light from the magneto-optical disk 21, and the address signal A is generated from the optical intensity signals PA and PB.
A and AB are generated and supplied to the system control unit 40.

By thus supplying the address signals AA and AB to the system control unit 40,
A position control signal is supplied from the system control unit 40 to a position control device (not shown), and the magnetic heads 37, 38 are supplied.
The optical pickups 43 and 44 are moved to desired positions in the recording area of the magneto-optical disk 21.

At this time, the positions of the optical pickup 43 and the optical pickup 44 are controlled so that the sum of the data transfer rates becomes constant. For example, when the optical pickup 43 is located at the position of the block 22a in the inner peripheral side area 22, the optical pickup 44 moves in the block 2 in the outer peripheral side area 23.
The position 3a is set, and the sum of the data transfer rates is made constant. The magnetic head 37 is located at a position facing the optical pickup 43, and the magnetic head 38 is located at a position facing the optical pickup 44.

When the data input signal DI is supplied to the data distributor 32, in the data distributor 32, the data input signal DI is generated according to the transfer rate of the block in which the optical pickups 43 and 44 are located based on the data distribution control signal DS. Is distributed. Magnetic fields are generated in the magnetic heads 37 and 38 based on the distributed input signals DA and DB which are the distributed data input signals DI. At this time, the optical pickups 43 and 44 irradiate the magneto-optical disc 21 with the laser light whose output level is set to the recording mode based on the laser control signal LC output from the system control unit 40. The signal is distributed to the blocks of and recorded.

When reproducing the signal distributed and recorded on the magneto-optical disk 21, the magneto-optical disk 21 is irradiated with the laser beam whose output level is in the reproduction mode as described above. Based on the address signals AA and AB obtained at this time, the optical pickups 43 and 44 are set to positions where desired signals are recorded, and demodulated signals DC and DD are obtained.

Further, in the system control section 40,
Based on the address signals AA and AB, the optical pickup 43,
A block in which 44 is located is discriminated, and a data mixing control signal DM for mixing the demodulation signals DC and DD is generated according to the transfer rate of the discriminated block.

In the data mixer 55, the timing of the demodulation signal DC and the demodulation signal DD is adjusted based on the data mixing control signal DM, the signals are mixed, and the same data output signal as the data input signal DI with a constant transfer rate. You can get DO. Depending on the signal recorded on the magneto-optical disk 21, it is also possible to reproduce the signal recorded on the magneto-optical disk 21 by simply mixing the signals obtained by reproducing the magneto-optical disk 21. .

As described above, according to the above-described embodiment, the blocks 22a to 22d having the spiral tracks in the same plane in which the signals are recorded from the inner peripheral side to the outer peripheral side and the outer peripheral side to the inner peripheral side are provided. Blocks 23a to 23d having spiral tracks in which the signals are recorded are formed on the blocks 23a to 23d, and the spiral directions of the tracks are different and the sum of transfer rates is constant, for example, in the blocks 22a and 23a, Since recording signals are distributed and recorded according to the transfer rate of each block,
A signal is recorded on the disc-shaped recording medium at a constant transfer rate.

Further, the block reproduction signals obtained from the blocks having different track spiral directions and the constant sum of the transfer rates are mixed according to the transfer rate of the reproduced blocks, so that the transfer rate is constant. The recording signal recorded on the disc-shaped recording medium is reproduced.

For this reason, recording and reproduction can be performed at a constant transfer rate without attaching recording media, and the disk-shaped recording medium can be made inexpensive. Moreover, since the signal can be continuously read without performing the track jump, the transfer rate is not lowered. Further, since recording and reproduction can be performed at a constant transfer rate by using the recording area in the same plane, even if the distance between the recording layer and the magnetic head is small, such as a magnetic field modulation type magneto-optical disk, it is easy. Applicable to

In the above-described embodiment, the recording area is divided into two areas, that is, the inner peripheral side area 22 and the outer peripheral side area 23, and the inner peripheral side area 22 and the outer peripheral side area 23 are arranged in the radial direction. Although the case where the block is divided into four blocks at equal intervals is shown, the area is not limited to two, and similarly, the block is not limited to four. The signal recorded on the magneto-optical disk 21 is the data modulator 33,
Of course, it is not limited to the signal modulated by 34.

In the above embodiments, the magneto-optical disk was used as the disk-shaped recording medium, but the disk-shaped recording medium is not limited to the magneto-optical disk as long as it has spiral tracks. .

[0047]

According to the present invention, the recording area of the disc-shaped recording medium is radially divided to form blocks.
Further, one block or a plurality of blocks are continuously used to form a plurality of areas. The plurality of areas are composed of areas in which the spiral direction of the track is in one direction and areas in the other direction, and areas having different spiral directions are paired, and transfer rates are transferred from each area of one or more pairs. The blocks are selected so that the sum is constant. Since the recording signal is distributed and recorded according to the transfer rate of the selected block, the signal is recorded at a constant transfer rate. Further, a signal is read from a block in each area of one or a plurality of pairs in which the recording signal is distributed and recorded, and the block reproduction signal obtained from the read signal is set to the transfer rate of the block in each area. Accordingly, the recording signals recorded on the disc-shaped recording medium are reproduced at a constant transfer rate.

In this way, areas having different spiral directions of tracks are formed in the recording areas on the same surface of the disk-shaped recording medium, and blocks are formed so that the sum of transfer rates becomes constant from the areas having different directions. Since the signal is recorded and reproduced by being selected, the signal can be recorded and reproduced at a constant transfer rate without attaching the recording mediums, so that the disc-shaped recording medium can be inexpensive.

Further, since the signal can be continuously read without performing the track jump, the transfer rate is not lowered.

Further, since it is possible to record and reproduce a signal at a constant transfer rate by using the recording area in the same plane, a gap between the recording layer and the magnetic head is small, such as a magneto-optical disk of a magnetic field modulation system. However, it can be easily applied.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a disc-shaped recording medium according to the present invention.

FIG. 2 is a diagram showing a configuration of an embodiment of a disk device according to the present invention.

FIG. 3 is a diagram showing a configuration of a zone CAV type optical disc.

FIG. 4 is a diagram showing a relationship between a bonded optical disc and an optical pickup.

FIG. 5 is a diagram showing a relationship between a magneto-optical disk, an optical pickup, and a magnetic head.

[Explanation of symbols]

 10 optical disk 11 recording area 12 bonded optical disk 13a, 13b, 17, 43, 44 optical pickup 15, 21 magneto-optical disk 16, 37, 38 magnetic head 22 inner circumference side area 23 outer circumference side area 31, 56 interface circuit 32 data distribution Device 33,34 Data modulator 35,36 Magnetic head drive unit 40 System control unit 41,42 Laser drive unit 45,46 Address signal extraction unit 47,48 Address demodulator 51,52 Data signal generation unit 53,54 Data demodulator 55 data mixer

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 20/12 9295-5D G11B 20/12

Claims (4)

[Claims] 1. A recording area in the same plane having a spiral track is divided in a radial direction to form a plurality of blocks, and the data transfer rate when rotated at a constant angular velocity is the block. In the disk-shaped recording medium that is constant within the block and increases from the inner peripheral side block to the outer peripheral side block, a plurality of areas formed by one or a plurality of consecutive blocks are formed, and the plurality of areas are formed. Is a disc-shaped recording medium in which the spiral direction of a track is composed of areas in one direction and areas in the other direction. 2. The inner peripheral side of the plurality of areas, the transfer rate of the blocks sequentially selected from the inner peripheral side of the area, and the outer peripheral side of the outer peripheral side areas of the plurality of areas having different track spiral directions are selected in order. The addition value with the transfer rate of the selected block is constant.
The disk-shaped recording medium described. 3. A recording area in the same plane having a spiral track is radially divided to form a plurality of blocks, and the data transfer rate when rotated at a constant angular velocity is within the blocks. The area is constant and increases from the inner circumference side block to the outer circumference side block, and a plurality of areas formed by one or a plurality of the above-mentioned blocks are formed. Using a disk-shaped recording medium consisting of areas in which the spiral direction is in one direction and areas in the other direction, the above areas with different spiral directions are paired, and the sum of the transfer rates from one or multiple areas is constant. Depending on the transfer rate of the block selected by the signal recording means and the signal recording means for recording the signal in each block And distributing the recorded signal disk apparatus characterized by comprising a signal distribution means for supplying to said signal recording means. 4. A recording area in the same plane having a spiral track is radially divided to form a plurality of blocks, and a data transfer rate when rotated at a constant angular velocity is constant within the block. And increases from the inner block to the outer block,
A plurality of areas are formed by one block or a plurality of continuous blocks, and the plurality of areas are composed of areas in which the spiral direction of the track is in one direction and areas in the other direction. The above areas having different numbers are paired, and the recording signal is distributed to the blocks selected from the one or a plurality of pairs of areas so that the sum of the transfer rates is constant, and the recording signal is distributed according to the transfer rate of each block. Signal reproducing means for obtaining a block reproduction signal for each area by reading a signal from a block in each area of a pair or a plurality of areas where the recording signal is distributed and recorded. According to the transfer rate of the block of each area from which the signal is read by the signal reproducing means, the block reproducing signals obtained by the signal reproducing means are mixed to form a recording signal. Disk apparatus characterized by having a signal mixing means for obtaining a first reproduced signal.