WO2004006239A1 - 高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 - Google Patents
高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 Download PDFInfo
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- WO2004006239A1 WO2004006239A1 PCT/JP2002/006738 JP0206738W WO2004006239A1 WO 2004006239 A1 WO2004006239 A1 WO 2004006239A1 JP 0206738 W JP0206738 W JP 0206738W WO 2004006239 A1 WO2004006239 A1 WO 2004006239A1
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims description 29
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- 230000003287 optical effect Effects 0.000 description 15
- 238000012937 correction Methods 0.000 description 7
- 230000005415 magnetization Effects 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 4
- 230000005381 magnetic domain Effects 0.000 description 3
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Classifications
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10595—Control of operating function
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- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/10506—Recording by modulating only the light beam of the transducer
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- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/10508—Recording by modulating only the magnetic field at the transducer
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- G11—INFORMATION STORAGE
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- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10528—Shaping of magnetic domains, e.g. form, dimensions
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- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/1053—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed to compensate for the magnetic domain drift or time shift
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
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- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
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- G11—INFORMATION STORAGE
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- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
Definitions
- the present invention relates to a high-density magneto-optical recording / reproducing apparatus and a high-density magneto-optical recording / reproducing method, and more particularly to a high-density magneto-optical recording / reproducing apparatus suitable for recording / reproducing minute marks and a high-density magneto-optical recording / reproducing.
- Background art
- optical modulation methods There are two main types of information recording methods on magneto-optical disks: optical modulation methods and magnetic field modulation methods.
- the light modulation method is a force method that modulates the irradiation amount of laser light according to information to be recorded.
- the size of the minimum recordable mark is determined by the characteristics of the optical system.
- the recording surface When the recording surface is illuminated with a laser beam, the I of the recording surface rises, and when it exceeds the Curie point, the magnetization existing on the recording surface disappears. Then, irradiation of the laser beam is stopped, and a recording mark is formed in accordance with the direction of magnetization given to the recording surface when the recording surface falls below a Curie point.
- the reversal time of the above-mentioned magnetization does not affect the formation of the recording magnetization, and the recording magnetization can be changed only by the timing of irradiating the laser pulse. Can be determined. This reduces jitter on the playback signal. Can be reduced. Therefore, the magnetic field modulation method is more suitable for recording a minute mark.
- the minimum size of a recorded mark that can be detected when reproducing recorded information is generally determined by the wavelength of the read laser beam and the parameters of the optical system such as the numerical aperture NA.
- the spot size of the focused laser light is proportional to the wavelength of the laser light and inversely proportional to NA. Accordingly, the shorter the wavelength of the laser beam and the larger the NA, the smaller the spot size of the laser beam that has been “ ⁇ ”, so that a smaller recorded mark can be read.
- MSR magnetic domain removal ⁇
- DWDD magnetic domain movement detection method
- MAMMO S magnetic domain expansion Using a media technology called “Equation”, it is also possible to detect a mark of a small size below the limit determined by the parameters of the reproduction optical system.
- the recording is performed using the magnetic field modulation method as in ____________________ and using a short wavelength laser and a high optical system, or using a medium technology such as DWDD.
- a medium technology such as DWDD.
- the position of the edge of the mark can be changed regardless of the recording pattern.
- the length of the mark to be recorded has a problem that the edge position of the recorded mark fluctuates even when the above-described magnetic field modulation method is used. The reasons are as follows.
- FIG. 1 is a diagram showing recording of information by a conventional magnetic field modulation method.
- Fig. 1 (A) shows the image of the ⁇ disc whose laser beam spot was applied to the optical disc by the force of 101.
- a distribution 102 is shown, and Tc indicates a Curie temperature.
- an arrow 103 indicates a traveling direction of a recording track on the disc with reference to a laser beam 101 of AI.
- FIGS. 1B and 1C show marks recorded on a recording layer 104 of a track on a disk.
- reference numeral 110 indicates the mark that is currently being recorded, and reference numeral 111 is recorded before the mark 110.
- the marked mark, reference number 112 indicates the mark recorded before the mark 111.
- the arrow 105 indicates the direction of the recording magnetic field for recording the mark 110.
- reference numeral 120 indicates the mark that is currently being recorded and reference numeral 121 indicates the mark recorded before mark 120, reference numeral 122 indicates Indicates the mark recorded before mark 1 2 1.
- the arrow 105 indicates the direction of the recording magnetic field for recording the mark 110.
- Figure 1 (D) shows the recording magnetic field 10 from the previously recorded mark 11 or 12 to the currently recorded mark 11 or 12 recording field. Indicates the switching of 5.
- FIG. 1E shows a pulse 130 for emitting laser light used in the magnetic field modulation method. In FIG. 1E, it is assumed that a laser beam is emitted when the pulse 130 is at a high level.
- the demagnetizing force of the mark recorded before the overwrite is recorded affects the mark currently recorded. For example, as shown in FIG. 1 (B), if the mark recorded immediately before the currently recorded mark 110 is the short mark 111, the short mark 111 and the preceding mark are recorded. Both demagnetizing fields of mark 1 1 2 affect the currently recorded mark 1 1 0. Specifically, the demagnetizing field 113 of the mark 111 and the demagnetizing field 114 of the mark 112 are superimposed on the recording magnetic field 105. When the mark 1 1 1 is short ⁇ , the demagnetizing field 1 1 3 of the mark 1 1 1 1 and the demagnetizing field 1 1 4 of the mark 1 1 2 are close to each other. At the point where the recording magnetic field 105 shown in FIG. 1D changes, the mark 110 is formed by the magnetic field 105. That is, the point of change from the mark 111 to the mark 110 approaches the point of change of the magnetic field 105.
- An object of the present invention is to provide a high-density magneto-optical recording / reproducing method which solves the above-mentioned problem of the obesity technique.
- Still another object of the present invention is to provide a high-density magneto-optical recording and reproducing method capable of compensating for a change in the edge position of a mark when reproducing the mark from a recording medium. It is to »
- a magneto-optical recording / reproducing apparatus for recording or reproducing information marks on a magneto-optical recording medium is provided with a means for determining the length of a recorded information mark, and a means for recording immediately before the recording it information mark.
- a means for changing the recording magnetic field strength for recording the mark is provided.
- FIG. 1 is a diagram showing recording of information by a conventional magnetic field modulation method.
- FIG. 2 is a diagram showing a first difficult example of the present invention.
- FIG. 3 is a diagram showing a second embodiment of the present invention.
- FIG. 4 is a diagram showing a second embodiment of the present invention.
- FIG. 5 is a diagram showing a third embodiment of the present invention.
- FIG. 6 is a diagram showing a fourth embodiment of the present invention.
- FIG. 7 is a diagram showing a fifth embodiment of the present invention.
- FIG. 8 is a diagram showing a sixth embodiment of the present invention.
- FIG. 9 is a diagram showing a signal format according to the seventh embodiment of the present invention.
- FIG. 10 is a diagram showing a reproduction signal timing of a phase detection pattern according to the seventh embodiment of the present invention.
- FIG. 11 is a diagram showing a schematic configuration of a seventh embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 2 shows a first embodiment of the present invention.
- the recorded mark is corrected so that the edge of the reproduced mark is held at a regular position.
- FIG. 2 shows a male example of a method of correcting a recorded mark to an age at which a long mark 121 is recorded immediately before a currently recorded mark 120.
- FIG. 2 (A) shows the 3 ⁇ 4 distribution 102 of a disc having a laser beam spot A i on the optical disc, and T c indicates the Curie.
- the arrow 103 indicates the traveling direction of the recording track on the disk with respect to the laser beam that is emitted.
- FIG. 2 ( ⁇ ) shows marks recorded on the recording layer 104 of the track on the disk.
- Reference number 120 indicates the currently recorded mark
- reference number 121 indicates the mark recorded before mark 120
- mark 122 is the long mark.
- An arrow 105 indicates a recording magnetic field for recording the mark 120.
- the reference numeral 105 in FIG. 2 (C) indicates the recording magnetic field 105 from the recording magnetic field of the previously recorded mark 122 to the recording magnetic field of the currently recorded mark 120. Indicates a switch. If the mark recorded immediately before is a short mark, the strength of the recording magnetic field is assumed to be 10+. Also the figure
- Reference number 130 of (C) indicates that the laser light to be used in the magnetic field modulation method is emitted.
- a pulse 130 is shown, and laser light is emitted when the pulse 130 is at a high level. It is assumed that the intensity of the pulse 130 for emitting laser light is A when the mark recorded immediately before is the age of the short mark.
- ⁇ 201 extending from Fig. 2 (A) to (F) indicates that the mark 121 was a short mark: ⁇ , switching of the recording magnetic field 105, and switching of the laser beam. The light emission timing of the pulse 130 for light emission is shown.
- FIG. 2 (C) shows a difficult example of correcting the recording of the mark 120.
- FIG. 2C shows a method for controlling the amplitude of the recording magnetic field 105.
- the time when the recording magnetic field 105 is changed from the recording magnetic field for recording the long mark 121 to the recording magnetic field + M for recording the mark 120 Will be at the same point as the shortest mark marked ⁇ .
- the strength of the magnetic field that records the mark 120 is the same as that of the short mark: Compared to ⁇ , decrease by a predetermined value m, and set to (M-m).
- the mark recorded immediately before is the same as that at the time of emission of the short mark, and the intensity is the same as that of ⁇ for recording the short mark. is there.
- FIG. 2D shows another embodiment of the correction of ⁇ for recording the mark 120.
- FIG. 2 (D) shows a method for controlling the change timing of the recording magnetic field 105.
- FIG. 2 (D) shows the time when the recording magnetic field 105 is changed from the recording magnetic field for recording the long mark 122 to the recording magnetic field + ⁇ for recording the mark 120. Is delayed by the time t 1 in comparison with the short mark ⁇ recorded immediately before. However, the magnetic field for recording the mark 120 is maintained at + M without change.
- the mark recorded immediately before is the same as the emission time of the short mark: ⁇ , and the intensity is the same as that of the short mark.
- ⁇ A is the same as
- FIG. 2E shows another embodiment of the recording of the mark 120: correction of ⁇ .
- FIG. 2E shows a method of controlling the amplitude of a pulse 130 for emitting laser light.
- the mark recorded immediately before is kept at the same point as the short mark.
- the intensity of the pulse 130 for emitting one laser beam is reduced by a predetermined value a, as compared with that of the mark recorded immediately before, to (A-a).
- the mark recorded immediately before was the same as the point at which the short mark was switched, and the amplitude was the same as the amplitude of the short mark, M, + M, of the short mark. Identical.
- FIG. 2F shows another embodiment of the correction of the mark 120;
- FIG. 2 (F) shows a method of controlling the emission point of a pulse 130 for emitting laser light.
- the emission point of the pulse 130 for emitting the laser light is delayed by the time t2 in comparison with the short mark of the mark recorded immediately before.
- the intensity of the pulse 130 for emitting the laser beam is the same as that of the short mark ⁇ in the mark A just recorded.
- the mark recorded immediately before was the same as that at the time of switching of the ⁇ of the short mark, and the amplitude of the mark recorded immediately before was M, + Same as M.
- the recording is performed so that the edge position of the reproduced mark does not change. Sometimes corrections can be made.
- the mark recorded immediately before is a short mark: based on ⁇ , the mark recorded immediately before is a long mark, and ⁇ is the recording magnetic field of the mark to be recorded. It is configured to control 105 or a pulse 130 for emitting laser light.
- the recording magnetic field of the mark to be recorded is emitted or laser light is emitted.
- the pulse 130 to be controlled is controlled in a manner reverse to that of the above-described embodiment, similarly, correction can be performed at the time of recording so that the edge position of the reproduced mark does not change.
- only the length of the mark recorded immediately before is used as a reference. However, by combining the length of the previous mark, more precise control is possible.
- the length of the immediately preceding mark is set to two levels, but this may be set to another level.
- the correction amounts m, tl, a, and t 2 may be fixedly stored in the high-density magneto-optical recording unit, and read and used according to the pattern recorded immediately before the pattern. . Further, for more precise control, a test pattern may be recorded in a test area of a recording medium, and the test pattern may be read and determined. By doing so, the customer correction amounts m, t1, a, and t2 can be determined more precisely for each recording medium.
- FIG. 3 shows a schematic block diagram of the high-density magneto-optical recording / reproducing apparatus of the present invention.
- the high-density magneto-optical recording / reproducing apparatus mainly includes a recording system 310, a magnetic head 311, an optical head 312, and a reproducing system 320.
- user data 301 to be recorded is input to the recording system 310.
- the recording system 310 processes the input user data 310 into a recording signal and outputs it to the magnetic head 311 and the optical head 312.
- the magnetic head 311 and the optical head 312 record the signal processed by the recording system 310 on the magneto-optical recording medium 313.
- the signal recorded on the disk is read by the optical head 312.
- the MO signal 314 and the clock mark 315 read by the optical head are sent to the reproduction system 322, where the reproduction signal is processed, and the user data 321 is output.
- FIG. 4 is a view showing a second embodiment of the present invention, and corresponds to the recording system 310 shown in FIG. Components in FIG. 4 that are assigned the same numbers as those in FIG. 3 indicate the same components.
- This difficult example shows an example of the recording for correcting the mark to be recorded when the mark is recorded on the recording medium, as described in the first embodiment.
- the recording system shown in FIG. 4 mainly includes a modulation circuit 401 and a recording compensation circuit 400.
- the recording compensation circuit 400 is mainly composed of a mark length detector 402, a recording IJ control circuit 400, It comprises a head drive circuit 404 and a laser drive circuit 405.
- the user data 3 is input to the modulation circuit 401, and the recording modulation power S is performed.
- the mark length of the user data modulated by the modulation circuit 401 is detected by the mark length detection circuit 402.
- the mark length detected by the mark length detection circuit 402 has a length equal to or greater than a predetermined threshold
- a signal indicating that a long mark has been detected in the recording circuit Send.
- the recording IJ control circuit 403 outputs the first mark when recording the mark next to the long mark.
- the amplitude or the delay time of the recording magnetic field or the pulse for emitting the laser light is controlled as shown in FIG.
- the magnetic head drive circuit 404 and the laser drive circuit A drive signal is supplied to each of the 405s.
- the magnetic head fiber circuit 404 and the laser drive circuit 405 drive the magnetic head 311 and the optical head 312 with the supplied drive signal, and 3 Record the signal in 1 3.
- FIGS. 5 to 8 the components denoted by the same reference numerals as those in FIG. 4 indicate the same components.
- FIG. 5 is a view showing a third difficult example of the present invention, and shows an example of a recording compensation circuit 400 that renews the operation corresponding to FIG. 2 (C).
- the self-recording compensation circuit 400 is mainly composed of a mark length detector 402, a magnetic field plating & 501, a magnetic head, a sleep circuit 404, and a laser drive circuit 40. 5 and a clock generator 502.
- the recording data 411 output from the modulation circuit 401 of FIG. 4 is supplied to the mark length detector 402 and the magnetic field bow daughter setting circuit 501.
- the clock 503 generated by the clock generation circuit 502 is supplied to the magnetic field setting circuit 501 and the laser drive circuit 405.
- the magnetic field setting circuit 501 and the laser driving circuit 405 operate based on the supplied clock 503.
- a detection signal 504 is supplied to the magnetic field strength setting circuit 501.
- the magnetic field strength setting circuit 501 sets a mark from a recording magnetic field M for recording a long mark when the next mark is recorded.
- the point at which the recording magnetic field is changed to the recording magnetic field + M is the same as the point at which the previously recorded mark is the short mark.
- the magnetic head drive circuit reduces the bow of the magnetic field that records the mark by a predetermined value m, so that the mark recorded immediately before is shorter than the short mark ⁇ , and becomes (Mm).
- Set the magnetic field boat to 404.
- the magnetic head and drive circuit 4104 drives the magnetic head 311 so as to generate a magnetic field having a magnetic field 3 (Mm) corresponding to the set value.
- the mark recorded immediately before the laser head is the same as the age of the short mark, and the optical head is the laser drive circuit. 405 is passed through 405.
- FIG. 6 is a diagram showing a fourth embodiment of the present invention, and shows an embodiment of a recording compensation circuit 400 that performs an operation corresponding to FIG. 2 (D).
- the self-recording compensation circuit 400 shown in Fig. 6 is mainly composed of a mark length detector 402, a magnetic field reversal position adjustment unit 61, a magnetic head drive circuit 404, and a laser drive circuit 405 It also comprises a cooktop generator 502.
- the recording data 411 output from the modulation circuit 401 in FIG. 4 is supplied to the mark length detector 402 and the magnetic field reversal position adjustment unit 6001.
- the clock 503 generated by the clock generation circuit 502 is supplied to the magnetic field reversal position adjustment section 601 and the laser and sleep circuit 405.
- the magnetic field reversal position adjustment unit 601 and the laser! 3 ⁇ 43 ⁇ 4 circuit 405 operate based on the supplied clock 503.
- a detection signal 504 is supplied to a magnetic field reversal position adjustment unit 601.
- the magnetic field reversal position adjustment unit 6001 records the next mark from the recording magnetic field for recording the long mark when recording the mark.
- the recording magnetic field is changed to the recording magnetic field One cycle is delayed by the time t 1 compared to the short mark: ⁇ .
- the strength of the magnetic field for recording the mark remains unchanged at + M.
- FIG. 7 is a diagram showing a fifth example of the present invention, and shows an embodiment of the recording compensation circuit 400 that performs the operation corresponding to FIG.
- the self-recording compensation circuit 400 shown in FIG. 7 is mainly composed of a mark length detector 402, a light emission power setting unit 701, a magnetic head drive circuit 404, a laser drive circuit 405, and the like. And a clock generator 502.
- the recording data 411 output from the modulation circuit 401 of FIG. 4 is supplied to the mark length detector 402 and the magnetic head sleep circuit 404.
- the clock 503 generated by the clock generating circuit 502 is supplied to the light emitting power & 701 and the magnetic head driving circuit 404.
- the light emission power setting unit 701 and the magnetic head drive circuit 404 operate based on the supplied clock 503.
- a detection signal 504 is supplied to the light emission power setting 701.
- the emission power setting 701 determines the emission point of the pulse for emitting the laser beam. Hold at the same point as the short mark: ⁇ .
- the amplitude of the pulse for emitting the laser light is set so that the mark recorded immediately before is reduced by a predetermined value a compared with the short mark: ⁇ , and becomes (A ⁇ a).
- the clock 503 and the recording data 411 are supplied to the magnetic head drive circuit 404, the mark recorded immediately before is the same as that of the short mark. Is put through a magnetic head drive circuit 404 to generate a magnetic field according to the recording data.
- FIG. 8 is a diagram showing a sixth embodiment of the present invention, and shows an embodiment of the recording compensation circuit 400 which renews the operation corresponding to FIG. 2 (F).
- the self-recording compensation circuit 400 is mainly composed of a mark length detector 402, a pulse position adjuster 8001, a magnetic head and a vertical circuit 404, and a laser drive circuit 400. 5 and a clock generator 502.
- the recording data output from the modulation circuit 401 in FIG. 4 is supplied to the mark length detector 402 and the magnetic head drive circuit 404.
- the clock 503 generated by the clock generation circuit 502 is supplied to the pulse position adjustment section 801 and the magnetic head promotion circuit 404.
- the pulse position adjuster 801 and the magnetic head drive circuit 404 operate based on the supplied clock 503.
- a detection signal 504 is supplied to the pulse position adjusting section 801.
- the pulse position adjustment unit 8001 determines the emission point of the pulse for emitting the laser light when recording the next mark, and determines the emission point of the pulse that emits the laser beam. Makes il® for a time t 2 compared to the short mark ⁇ . However, the amplitude of the pulse that emits one laser beam is kept the same as the age of the short mark of the mark recorded immediately before.
- the clock 503 and the recording data 411 are supplied to the magnetic head drive circuit 404, the mark recorded immediately before is the same as the short mark # ⁇ .
- the magnetic head is driven via the magnetic head I circuit 404 to generate a magnetic field according to the recording data.
- a high-density magneto-optical recording / reproducing apparatus and a high-density magneto-optical recording / reproducing apparatus capable of recording a mark on a recording medium so that the edge position of the mark reproduced from the recording medium does not change. Recording and playback methods are available.
- the edge of the reproduced mark is corrected so as to be at a regular position.
- FIG. 9 shows a signal for recording a position detection pattern in order to correct the edge of a reproduced mark so that the mark is reproduced at a regular position when reproducing the mark from the recording medium according to the present invention.
- This signal format is the ID signal It consists of a pre-pit area 901 to be placed and an MO area 902.
- the MO recording area 902 further includes a phase detection pattern section 903 for arranging a phase detection pattern according to the present invention, and a user data section 904.
- FIG. 10 is a diagram showing a reproduction signal timing of the phase detection pattern arranged in the phase detection pattern unit 903.
- FIG. 10A shows a phase detection pattern reproduced from the phase detection pattern section 903.
- the phase detection pattern includes a repetition of the shortest 2T signal (patterns P1, P2, and P3) and a repetition of the longest 8T signal (pattern P4). , P5, P6).
- FIG. 10B shows a clock signal for detecting a phase detection pattern.
- FIG. 11 is a diagram showing a schematic configuration of a difficult example of the reproducing system according to the present invention.
- the playback system corresponds to the playback system 320 in Fig. 3.
- the playback system shown in Fig. 11 mainly consists of an amplifier 1 ioi, mmi i o o 2, analog / digital variable buffer 11 o 3, a level detector 1104, a phase lock loop (PLL) 1105, and a delay It comprises an Hl 106, a selection scale 1107, a data detector 1108, and a demodulation circuit 1109.
- PLL phase lock loop
- the phase detection pattern unit 903 shown in FIG. uses the reproduced phase detection pattern, the selector 1107 selects a clock to be supplied to the analog digital Z digital converter HI 103.
- this operation will be described with reference to FIG.
- the clock mark 315 supplied to the reproducing system 320 from the optical head 312 shown in the schematic block diagram of the high-density magneto-optical recording / reproducing device of the present invention in FIG. 3 is supplied to the PLL 1105 in FIG. .
- the PLL 1105 generates a clock CLK synchronized with the clock mark 315.
- the clock CLK is sent to the delay # 1106, and each of the delay taps 1110 outputs a clock CLK delayed by a predetermined time.
- the selector 1107 controls the clock CLK output from each tap 1110 One of them is selected according to the input signal 1111 from the level detector 1104.
- the level detector 1104 When set to the initial state, the level detector 1104 outputs a signal for selecting a predetermined tap such as, for example, a center tap to the selector 1107, and outputs a signal to the selector 1107. Determine the level of output from.
- the level / level detector 1104 has a sampling pattern of short patterns Pl, P2, and P3, which is a repeating pattern of 2 T, all of which are either +1 or 1 1.
- the selector 1107 is controlled to select the tap 1110 of the 31 unit 1106 so as not to take such an intermediate value. In this way, when the immediately preceding recording pattern is a short mark, a 1: 1 close phase is determined.
- a point indicated by a circle represents a digital value sampled and converted by the analog-to-digital converter 1103 in the state of the optimal clock phase of the short mark ⁇ . Show.
- the rising point of the clock CLK indicates the sampling point of the analog / digital converter 1103.
- the level detector 1104 controls the selector 1107 while monitoring the output of the analog-to-digital converter 1103, and the tap with a small delay of the delay 1106 Are sequentially selected, and the delay amount at which the sampling point corresponding to the circle 1002 becomes +1 is selected.
- the immediately preceding recording pattern determines the close phase of the long mark ⁇ .
- the optimal clipping phase of the short mark of the immediately preceding recording pattern and the clipping phase of the oldest recording pattern of the long mark are determined as described above. ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ .
- the data detector 110 monitors the output of the digital converter 1103. If the currently reproduced pattern is a short pattern having a length equal to or less than a predetermined length, the immediately preceding recording pattern stored in the level detector 1104 described above is a short mark. A signal is sent from the data detector 1108 to the level detector 111 so as to select the peak phase. When this signal is received, the level detector 1104 selects the tap so that the selector 1107 selects the shortest phase of the previous recording pattern with the short mark. select. On the other hand, the currently reproduced pattern is a pattern longer than a predetermined length ⁇ 81.
- a signal is sent from the data detector 1108 to the level detector 111 so as to select a tilde phase. Upon receiving this signal, the level detector 1104 selects the tap so that the recording pattern immediately before it selects the clock phase with the long mark of the long mark.
- the clock supplied to the analog / digital converter 1103 is selected to have a specific phase.
- the analog / digital converted data detector The data detected by 1108 is sent to the demodulation circuit 1109, and the detected user data 3221 is output.
- the clock phase for sampling the mark can be adjusted to:, so that data can be recorded at a high density on a recording medium. can do.
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Description
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNA028289293A CN1625772A (zh) | 2002-07-03 | 2002-07-03 | 高密度光磁记录再现装置及高密度光磁记录再现方法 |
KR1020047017739A KR100648055B1 (ko) | 2002-07-03 | 2002-07-03 | 고밀도 광자기 기록 재생 장치 및 고밀도 광자기 기록재생 방법 |
AU2002346148A AU2002346148A1 (en) | 2002-07-03 | 2002-07-03 | High-density magneto-optical recording/reproducing apparatus and high-density magneto-optical recording/reproducing method |
JP2004519176A JPWO2004006239A1 (ja) | 2002-07-03 | 2002-07-03 | 高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 |
EP02743802A EP1530211A4 (en) | 2002-07-03 | 2002-07-03 | HIGH-DENSITY MAGNETO-OPTICAL RECORDING / READING APPARATUS AND CORRESPONDING METHOD |
PCT/JP2002/006738 WO2004006239A1 (ja) | 2002-07-03 | 2002-07-03 | 高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 |
US10/972,815 US20050068853A1 (en) | 2002-07-03 | 2004-10-25 | Magneto-optical recording/reproducing apparatus and magneto-optical recording/reproducing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/006738 WO2004006239A1 (ja) | 2002-07-03 | 2002-07-03 | 高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/972,815 Continuation US20050068853A1 (en) | 2002-07-03 | 2004-10-25 | Magneto-optical recording/reproducing apparatus and magneto-optical recording/reproducing method |
Publications (1)
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WO2004006239A1 true WO2004006239A1 (ja) | 2004-01-15 |
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PCT/JP2002/006738 WO2004006239A1 (ja) | 2002-07-03 | 2002-07-03 | 高密度光磁気記録再生装置及び、高密度光磁気記録再生方法 |
Country Status (7)
Country | Link |
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US (1) | US20050068853A1 (ja) |
EP (1) | EP1530211A4 (ja) |
JP (1) | JPWO2004006239A1 (ja) |
KR (1) | KR100648055B1 (ja) |
CN (1) | CN1625772A (ja) |
AU (1) | AU2002346148A1 (ja) |
WO (1) | WO2004006239A1 (ja) |
Families Citing this family (1)
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KR100712550B1 (ko) * | 2006-02-03 | 2007-05-02 | 삼성전자주식회사 | 하드디스크 드라이브의 고밀도 기록 방법 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06176430A (ja) * | 1992-12-04 | 1994-06-24 | Canon Inc | 光磁気記録再生装置 |
JPH0836801A (ja) * | 1994-07-21 | 1996-02-06 | Matsushita Electric Ind Co Ltd | 光磁気記録媒体の記録方法 |
JPH08180496A (ja) * | 1994-10-24 | 1996-07-12 | Sony Corp | 光磁気ディスクの記録方法、再生方法及び再生装置 |
JPH09198736A (ja) * | 1996-01-12 | 1997-07-31 | Canon Inc | 光磁気記録方法及び光磁気記録装置 |
JPH1031825A (ja) * | 1996-07-16 | 1998-02-03 | Sony Corp | 光ディスク、光ディスク装置及び光ディスクの記録方法 |
JP2000067483A (ja) * | 1998-08-25 | 2000-03-03 | Victor Co Of Japan Ltd | 光磁気記録方法、光磁気記録装置、光磁気再生方法、光磁気再生装置、光磁気記録媒体 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5761171A (en) * | 1994-10-24 | 1998-06-02 | Sony Corporation | Generating data detecting threshold levels from reference patterns recorded in an optical disk, such as a magneto-optical disk |
-
2002
- 2002-07-03 CN CNA028289293A patent/CN1625772A/zh active Pending
- 2002-07-03 KR KR1020047017739A patent/KR100648055B1/ko not_active IP Right Cessation
- 2002-07-03 EP EP02743802A patent/EP1530211A4/en not_active Withdrawn
- 2002-07-03 JP JP2004519176A patent/JPWO2004006239A1/ja active Pending
- 2002-07-03 AU AU2002346148A patent/AU2002346148A1/en not_active Abandoned
- 2002-07-03 WO PCT/JP2002/006738 patent/WO2004006239A1/ja active Application Filing
-
2004
- 2004-10-25 US US10/972,815 patent/US20050068853A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06176430A (ja) * | 1992-12-04 | 1994-06-24 | Canon Inc | 光磁気記録再生装置 |
JPH0836801A (ja) * | 1994-07-21 | 1996-02-06 | Matsushita Electric Ind Co Ltd | 光磁気記録媒体の記録方法 |
JPH08180496A (ja) * | 1994-10-24 | 1996-07-12 | Sony Corp | 光磁気ディスクの記録方法、再生方法及び再生装置 |
JPH09198736A (ja) * | 1996-01-12 | 1997-07-31 | Canon Inc | 光磁気記録方法及び光磁気記録装置 |
JPH1031825A (ja) * | 1996-07-16 | 1998-02-03 | Sony Corp | 光ディスク、光ディスク装置及び光ディスクの記録方法 |
JP2000067483A (ja) * | 1998-08-25 | 2000-03-03 | Victor Co Of Japan Ltd | 光磁気記録方法、光磁気記録装置、光磁気再生方法、光磁気再生装置、光磁気記録媒体 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1530211A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1530211A1 (en) | 2005-05-11 |
EP1530211A4 (en) | 2008-02-27 |
JPWO2004006239A1 (ja) | 2005-11-04 |
AU2002346148A1 (en) | 2004-01-23 |
CN1625772A (zh) | 2005-06-08 |
US20050068853A1 (en) | 2005-03-31 |
KR100648055B1 (ko) | 2006-11-23 |
KR20040111577A (ko) | 2004-12-31 |
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