WO2004023470A1 - 光磁気記録媒体及び光磁気記録装置 - Google Patents
光磁気記録媒体及び光磁気記録装置 Download PDFInfo
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- WO2004023470A1 WO2004023470A1 PCT/JP2002/008774 JP0208774W WO2004023470A1 WO 2004023470 A1 WO2004023470 A1 WO 2004023470A1 JP 0208774 W JP0208774 W JP 0208774W WO 2004023470 A1 WO2004023470 A1 WO 2004023470A1
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- optical recording
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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
- G11B11/10597—Adaptations for transducing various formats on the same or different carriers
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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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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/131—Arrangement of detectors in a multiple array
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
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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
- G11B11/10532—Heads
- G11B11/10541—Heads for 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
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B2020/1259—Formatting, e.g. arrangement of data block or words on the record carriers on discs with ROM/RAM areas
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/211—Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2525—Magneto-optical [MO] discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/0079—Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
Definitions
- the present invention provides a magneto-optical recording medium having both functions of ROM (Read 0 n Memory) using optical phase bits formed on a substrate and RAM (Rand om Access Memory) using a magneto-optical recording film.
- the present invention relates to a magneto-optical recording device, and more particularly, to a magneto-optical recording medium and a magneto-optical recording device for favorably reproducing both of them.
- a land 75 sandwiched between groups 74 serving as tracking guides has a phase bit 78 serving as a header part 76 and a user data part 77.
- the user part 77 is a flat lander 5 sandwiched between the groups 4 and is recorded as a magneto-optical signal.
- the magneto-optical recording medium 74 capable of simultaneous reproduction by the ROM-RAM has a radial cross-sectional structure shown in FIG. 33.
- a substrate 74A such as polycarbonate, a dielectric film 74B, an optical film such as TbFeCo, etc.
- Still another object of the present invention is to provide a magneto-optical recording medium and a magneto-optical recording apparatus for reducing light intensity modulation noise accompanying reading of ROM information.
- the magneto-optical recording medium and apparatus of the present invention provide a recordable thin film on an optical phase bit formed on a substrate, and provide both the phase pit signal and the signal of the recording film.
- a magneto-optical recording medium capable of optically reproducing information has a configuration including at least a phase pit substrate, a first dielectric layer, a recording layer, a second dielectric layer, and a reflective layer, and the recording layer is mainly made of TbFeCo.
- the reflection level of the entire mirror is Im and the phase pit signal intensity level is Ip
- the end of the phase pit is 5 ⁇ 100 ⁇ lp / Im ⁇ 20.
- the part shape was configured.
- the shape of the end of the phase pit is 7 ⁇ 100 X Ip / Im ⁇ 15.
- the film thickness of the recording layer is in the range of 25 nm to 40 nm, so that the jitter can be optimized for both the M0 signal and the phase pit signal with a margin. Signal quality during simultaneous playback.
- the composition of the recording layer is Tb x (Fe 1QQ - y Co y ), 20 ⁇ x ⁇ 25%, 5 ⁇ y ⁇ 15%, so that the M 0 signal and the phase Both pit signals can be optimized, and the signal quality during simultaneous playback can be improved.
- FIG. 2 is a perspective view illustrating a recording state of the R0M information and the RAM information in the magneto-optical recording medium shown in FIG.
- FIG. 3 is a cross-sectional view taken along the line DD ′ of the phase pit of FIG.
- FIG. 4 is an explanatory diagram of an evaluation sample used in the present invention.
- FIG. 5 is an explanatory diagram of a signal intensity ratio to be evaluated in the present invention.
- FIG. 6 is an explanatory diagram of a signal signal to be evaluated according to the present invention.
- FIG. 7 is a diagram showing the shape of the sample and the measurement results of jitter with the ultraviolet irradiation time varied.
- FIG. 8 is a diagram showing the relationship between the ultraviolet irradiation time and the radius of curvature according to FIG.
- FIG. 9 is a diagram showing the relationship between the ultraviolet irradiation time and the maximum inclination according to FIG.
- FIG. 10 is a diagram showing the relationship between the ultraviolet irradiation time and I p / Im according to FIG.
- FIG. 11 is a diagram showing the relationship between the UV irradiation time, the MO jitter, and the phase pit jitter shown in FIG.
- FIG. 12 is a diagram showing a measurement result of the jitter of a sample in which the Gd composition ratio of the configuration of FIG. 1 is changed.
- FIG. 13 is a diagram showing the relationship between the Gd composition ratio and jitter according to FIG.
- FIG. 14 is a diagram showing the measurement results of the jitter of the sample in which the GFC film thickness ratio of the configuration of FIG. 1 was changed.
- FIG. 15 is a graph showing the relationship between the GFC film thickness ratio shown in FIG.
- FIG. 16 is a sectional view of a magneto-optical recording medium according to another embodiment of the present invention.
- FIG. 17 is a diagram showing the measurement results of the jitter of the samples of FIGS. 1 and 16 with the recording layer thickness changed.
- FIG. 18 is a diagram showing the relationship between the recording layer thickness and jitter according to FIG.
- FIG. 19 is a diagram showing, as a comparative example, a measurement result of the jitter of a sample in which the thickness of the recording layer was changed when no ROM portion was provided.
- FIG. 20 is a graph showing the relationship between the recording layer thickness and jitter according to FIG. 19 as a comparative example.
- FIG. 21 is a diagram showing the results of measurement of samples of the configurations shown in FIGS. 1 and 16 with different Tb composition ratios.
- FIG. 22 is a diagram showing the relationship between the Tb composition ratio according to FIG.
- FIG. 23 is a sectional view of a magneto-optical recording medium according to still another embodiment of the present invention.
- FIG. 24 is an overall block diagram of the configuration of one embodiment of the magneto-optical recording apparatus of the present invention. is there.
- FIG. 25 is a detailed view of the optical system of the optical pickup of FIG.
- FIG. 26 is a partial detailed block diagram of FIG.
- FIG. 27 is a layout diagram of the optical detectors of FIGS. 25 and 26.
- FIG. 28 is a diagram for explaining the relationship between the output of the optical detector shown in FIG. 27, focus error (FES) detection, track error (TES) detection, the MO signal, and the LD feedback signal based on the output.
- FES focus error
- TES track error
- FIG. 29 is a diagram showing combinations of ROM and RAM detection in each of the reproduction and recording modes in the main controller in FIGS. 24 and 26.
- FIG. 30 is a block diagram of another embodiment of the magneto-optical recording device of the present invention.
- FIG. 31 is a plan view of a conventional magneto-optical recording medium.
- FIG. 32 is an explanatory diagram of the user area of FIG.
- FIG. 34 is a plan view illustrating a recording state of ROM information and RAM information in the magneto-optical recording medium having the structure of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a cross-sectional view of a concurrent magneto-optical recording medium according to an embodiment of the present invention
- FIG. 2 is a diagram showing the relationship between a ROM signal and a RAM signal
- FIG. 3 is a cross-sectional view of the phase pit.
- the structure of the magneto-optical disk 4 for providing the ROM and RAM functions to the user area consists of silicon nitride on a polycarbonate substrate 4A on which phase pits 1 are formed.
- SiN silicon nitride on a polycarbonate substrate 4A on which phase pits 1 are formed.
- first dielectric layer 4B made of tantalum oxide, etc.
- two layers composed of rare-earth (Tb, Gd) and transition metal (FeCo) amorphous alloys such as TbFeCo, GdFeCo Magneto-optical recording layer 4C, 4D
- a second dielectric layer 4F made of the same material as the first dielectric layer 4B
- a reflective layer 4G made of a metal such as Al or Au
- a protective coat layer using an ultraviolet-curable resin a protective coat layer using an ultraviolet-curable resin.
- the ROM function is provided by the phase pits 1 formed on the disk 4 in an uneven manner
- the RAM function is provided by the magneto-optical recording layers 4C and 4D.
- a laser beam is heated on the magneto-optical recording layers 4C and 4D to assist magnetization reversal, and the direction of magnetization is reversed in response to a signal magnetic field. Record magnetic signal 2.
- recording of RAM information is possible.
- the weak polarization of the laser light is applied to the recording layers 4C and 4D according to the direction of magnetization of the recording layers 4C and 4D.
- Figure 3 is a D-D 5 cross-sectional view of a phase pit 1 in FIG. 2, the phase pit 1, bi Uz-wide W, defined by the pit depth P d.
- the edge shape of the phase pit 1 has a large effect on reflected light.
- the shape of this edge is defined by the maximum inclination angle and the radius of curvature. According to the study of the present inventor, this edge shape changes the light modulation intensity of the phase pit and affects the polarization of the reflected light. Therefore, optimization of the edge shape of the phase pit enables reproduction of the phase pit. It has been found that the jitter of the signal and the jitter of the magneto-optical reproduction signal can be controlled within a desired range.
- the substrate 4A was moved to another chamber, the Tb gate and the Fe84Col2 gate were simultaneously discharged, and the input power ratio was changed to change the input power ratio to make the recording layer composed of Tb22 (FeCol2) 78. 4 C was deposited.
- the film thickness can be changed by adjusting the film formation time.
- a 7 nm thick GdFeCo layer 4 D was added to the Tb22 (feCol2), 25 nm thick recording layer 4 C as shown in Fig. 1.
- the substrate 4A was moved to the first chamber 1 to form a 15 nm SiN overcoat layer 4F and a 5 nm nm A1 layer 4G.
- An ultraviolet-curing resin coat was applied thereon, and a magneto-optical recording medium 4 shown in FIG. 1 was produced.
- This magneto-optical recording medium evaluation sample has a cross section of FIG. 1 as shown in FIG.
- the region 42 provided is provided, and the region 44 provided with a group without providing a phase pit is provided.
- the measurement is performed with the signal intensity ratio of the sample having this configuration and the jitter being evaluated.
- the signal intensity ratio was set to 4.8 m / s at a linear velocity of 4.8 m / s by mounting this sample on a 650 nm, NAO.55 recording / reproducing device (M0 Test Yuichi; Shibasoku LM530C). Rotate to focus on the mirror surface (total reflection surface) 46, the light intensity (reflected light intensity) Im when light is focused, and the area 42, and focus on the phase-pit signal intensity (pit) Intensity difference between with and without) Ip is measured as shown in Fig.5.
- the signal intensity ratio is expressed as I p / I m and evaluates the effect of the phase pit on the reflected light.
- optical modulation recording was performed in the ROM section 42 of this sample with 1-7 modulation with the shortest mark of 0.70 zm, and the jitter as shown in Fig. 6 was obtained by the time-in analysis and the balance analyzer. It was measured. Jitter corresponds to the amount of deviation from the target mark length, and if the deviation of the reproduced mark length exceeds the detection limit, a reproduction error occurs.
- Phase pit 1 is shaped
- the curved shape of the edge of the phase pit can be changed.
- seven substrate samples 1, which were irradiated with ultraviolet light having an optical power density of 25 mW / sq cm for 0, 2, 4, 6, 8, 10, and 12 minutes, respectively. 2, 3, 4, 5, 6, and 7 were prepared, and a recording film having the structure shown in FIG. 1 was formed.
- the conditions of the recording layer were Tb22 (feCol2), a film thickness of 25 nm, Gdl9 (FeCo20), and a film thickness of 7 nm.
- the radius of curvature and the maximum slope of the phase bit were measured with an AFM (Atomic Focus Microscope). Further, the signal intensity ratio I pZlm was measured as described above, and further, Jiyuichi measured the jitter of the M0 signal and the jitter of the phase pit signal.
- Figure 7 shows the results. .
- FIG. 8 to 11 are graphs showing the measurement results of FIG. Fig. 8 is a graph showing the change in the radius of curvature (nm) with respect to the ultraviolet irradiation time (minute).
- Fig. 9 is a graph showing the change in the maximum inclination angle (degree) with respect to the ultraviolet irradiation time (minute).
- FIG. 11 is a graph showing changes in I p / Im (%) with respect to irradiation time, and FIG. 11 is a graph showing changes in MO signal jitter and phase bit signal jitter with respect to ultraviolet irradiation time.
- the MO signal jitter is reduced and improved by increasing the UV irradiation time.From Figs. 8 and 9, increasing the UV irradiation time increases the radius of curvature and reduces the maximum tilt angle. As a result, it can be seen that the M0 signal jitter is improved. Conversely, it can be seen from FIG. 10 that the phase pit reproduction jitter increases as Ip / Im decreases in accordance with FIG.
- the signal jitter that does not cause reproduction error is 10% or less.
- the ultraviolet irradiation time is 4 to 9 minutes in order to satisfy both jitters of 8% or less.
- the optimal range of I p / I m in Fig. 10 is from 7% to 15%, and the radius of curvature is from 75 nm to 120 nm from Fig. 8, and from 20 degrees to 3 from Fig. 9. A range of 5 degrees is more preferred.
- the jitter of both the MO signal and the phase pit signal can be optimized, and the signal quality during simultaneous reproduction can be improved.
- the Gd composition (atomic%) is good when the Gd composition (atomic%) is in the range of 16% to 24%, preferably 21% or less at room temperature, where transition metal (FeCo) is preferred. Jitter characteristics are obtained. At 16% or less, the GdFeCo layer becomes a single layer and becomes an in-plane film, and at 23% or more, rare earth (Gd) dominates at room temperature.
- transition metal FeCo
- FIG. 1 1 shows the jitter measurement results of the M0 signal of the TbFeCo single layer and the two-layer structure of eight samples 50 to 57, each of which has a recording layer thickness of 10 to 50.
- Fig. 8 is a graph in which the single-layer characteristic is E and the two-layer characteristic is F. According to FIG.
- the optical pickup 5 is moved by a track actuator 6 such as a ball screw feed mechanism, and can access an arbitrary position in the radial direction of the optical information recording medium 4. Further, an LD driver 31 for driving the laser diode LD of the optical head 7 and a magnetic head driver 34 for driving the magnetic head 35 of the optical pickup 5 are provided.
- the access controller 15-2 uses the output from the optical head 7, the track actuator 6, the motor controller 18, and the optical head 7 for the focus actuator. 1 Servo control 9.
- the controller 15-1 operates the LD driver 31, magnetic head drino 34, and access servo controller 15-2 to record and reproduce information.
- the diffused light from the laser diode LD passes through the three-beam tracking diffraction grating 10 and the beam splitter 11 to be collimated by the collimator lens 39, and is reflected by the mirror 40. Thereafter, the light is focused on the optical information recording medium 4 to a diffraction limit by the objective lens 16.
- the main controller 15 supplies the input data to the magnetic head driver 34 when using the magnetic field modulation recording method.
- the magnetic head driver 34 is The head 35 is driven to modulate the magnetic field corresponding to the recording time.
- the light emission of the semiconductor laser diode LD is negatively feedback-controlled so as to be one of the same.
- the present invention has been described with the embodiments. However, various modifications of the present invention are possible within the scope of the present invention, and these are not excluded from the technical scope of the present invention. Absent.
- the size of the phase pit is not limited to the numerical value described above, and other sizes can be applied.
- Other magneto-optical recording materials can be applied to the magneto-optical recording film.
- the magneto-optical recording medium is not limited to a disk shape but may be a card shape or the like. Industrial applicability
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Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/008774 WO2004023470A1 (ja) | 2002-08-30 | 2002-08-30 | 光磁気記録媒体及び光磁気記録装置 |
AU2002328601A AU2002328601A1 (en) | 2002-08-30 | 2002-08-30 | Magneto-optical recording medium and magneto-optical recording apparatus |
PCT/JP2003/003926 WO2004027773A1 (ja) | 2002-08-30 | 2003-03-28 | 光磁気記録媒体及び光磁気記録装置 |
JP2004537531A JP3998684B2 (ja) | 2002-08-30 | 2003-03-28 | 光磁気記録媒体及び光磁気記録装置 |
CNA038199203A CN1679100A (zh) | 2002-08-30 | 2003-03-28 | 磁光记录介质和磁光记录装置 |
AU2003220890A AU2003220890A1 (en) | 2002-08-30 | 2003-03-28 | Magneto-optical recording medium and magneto-optical recorder |
US11/051,739 US7313056B2 (en) | 2002-08-30 | 2005-02-04 | Magneto-optical recording medium and magneto-optical recording device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2002/008774 WO2004023470A1 (ja) | 2002-08-30 | 2002-08-30 | 光磁気記録媒体及び光磁気記録装置 |
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PCT/JP2003/003926 Continuation WO2004027773A1 (ja) | 2002-08-30 | 2003-03-28 | 光磁気記録媒体及び光磁気記録装置 |
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WO2004023470A1 true WO2004023470A1 (ja) | 2004-03-18 |
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PCT/JP2002/008774 WO2004023470A1 (ja) | 2002-08-30 | 2002-08-30 | 光磁気記録媒体及び光磁気記録装置 |
PCT/JP2003/003926 WO2004027773A1 (ja) | 2002-08-30 | 2003-03-28 | 光磁気記録媒体及び光磁気記録装置 |
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PCT/JP2003/003926 WO2004027773A1 (ja) | 2002-08-30 | 2003-03-28 | 光磁気記録媒体及び光磁気記録装置 |
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US (1) | US7313056B2 (ja) |
JP (1) | JP3998684B2 (ja) |
CN (1) | CN1679100A (ja) |
AU (2) | AU2002328601A1 (ja) |
WO (2) | WO2004023470A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2005122162A1 (ja) * | 2004-06-09 | 2005-12-22 | Fujitsu Limited | 記録媒体および記録媒体駆動装置向け信号処理装置 |
WO2005122163A1 (ja) * | 2004-06-09 | 2005-12-22 | Fujitsu Limited | 記録媒体 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3856808B2 (ja) * | 2002-08-30 | 2006-12-13 | 富士通株式会社 | 多重記録媒体、記録再生装置及び記録再生方法 |
EP1688945A1 (en) * | 2003-11-28 | 2006-08-09 | Fujitsu Limited | Optical disc and recording/reproduction device |
JP2007299472A (ja) * | 2006-04-28 | 2007-11-15 | Fujitsu Ltd | 光再生媒体および光再生媒体の製造方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03154241A (ja) * | 1989-11-13 | 1991-07-02 | Hitachi Ltd | 光磁気記録媒体 |
JPH0567355A (ja) * | 1991-07-08 | 1993-03-19 | Hitachi Maxell Ltd | 光デイスクおよびその製造方法 |
JPH06162590A (ja) * | 1992-11-20 | 1994-06-10 | Sony Corp | 光ディスク |
JPH0714231A (ja) * | 1993-06-29 | 1995-01-17 | Sharp Corp | 光磁気ディスク、光ピックアップ及び光磁気ディスク装置 |
JPH09180277A (ja) * | 1995-12-26 | 1997-07-11 | Kyocera Corp | 光磁気ディスク |
JPH09306053A (ja) * | 1996-05-13 | 1997-11-28 | Sony Corp | 光磁気記録媒体 |
JPH11213470A (ja) * | 1998-01-22 | 1999-08-06 | Sony Corp | 光磁気ディスク及びその製造方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06103548B2 (ja) | 1983-07-29 | 1994-12-14 | 株式会社東芝 | 光学的情報記録媒体 |
US6200673B1 (en) * | 1989-11-13 | 2001-03-13 | Hitachi, Ltd. | Magneto-optical recording medium |
JPH04147449A (ja) | 1990-10-09 | 1992-05-20 | Hitachi Maxell Ltd | 光デイスク装置 |
JPH06124480A (ja) | 1992-10-12 | 1994-05-06 | Sony Corp | 光ディスク |
JPH0765375A (ja) | 1993-08-20 | 1995-03-10 | Fujitsu General Ltd | コンカレントrom/ram光ディスク装置 |
JPH08138245A (ja) | 1994-11-04 | 1996-05-31 | Mitsubishi Chem Corp | 光記録方法及び光記録媒体 |
JP2000149331A (ja) * | 1998-11-02 | 2000-05-30 | Sony Corp | 光記録媒体、光記録媒体製造用原盤及び光記録再生装置 |
JP2000348385A (ja) | 1999-06-03 | 2000-12-15 | Mitsui Chemicals Inc | 光記録媒体 |
US20050201263A1 (en) * | 2003-03-12 | 2005-09-15 | Fujitsu Limited | Magneto-optical recording medium and a magneto-optical recording device thereof |
WO2004081931A1 (ja) * | 2003-03-12 | 2004-09-23 | Fujitsu Limited | 光記録媒体の製造方法及びその製造装置 |
US20050207324A1 (en) * | 2003-05-23 | 2005-09-22 | Fujitsu Limited | Magneto-optical recording medium and method of making the same and magneto-optical recording medium drive |
-
2002
- 2002-08-30 AU AU2002328601A patent/AU2002328601A1/en not_active Abandoned
- 2002-08-30 WO PCT/JP2002/008774 patent/WO2004023470A1/ja not_active Application Discontinuation
-
2003
- 2003-03-28 CN CNA038199203A patent/CN1679100A/zh active Pending
- 2003-03-28 JP JP2004537531A patent/JP3998684B2/ja not_active Expired - Fee Related
- 2003-03-28 AU AU2003220890A patent/AU2003220890A1/en not_active Abandoned
- 2003-03-28 WO PCT/JP2003/003926 patent/WO2004027773A1/ja active Application Filing
-
2005
- 2005-02-04 US US11/051,739 patent/US7313056B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03154241A (ja) * | 1989-11-13 | 1991-07-02 | Hitachi Ltd | 光磁気記録媒体 |
JPH0567355A (ja) * | 1991-07-08 | 1993-03-19 | Hitachi Maxell Ltd | 光デイスクおよびその製造方法 |
JPH06162590A (ja) * | 1992-11-20 | 1994-06-10 | Sony Corp | 光ディスク |
JPH0714231A (ja) * | 1993-06-29 | 1995-01-17 | Sharp Corp | 光磁気ディスク、光ピックアップ及び光磁気ディスク装置 |
JPH09180277A (ja) * | 1995-12-26 | 1997-07-11 | Kyocera Corp | 光磁気ディスク |
JPH09306053A (ja) * | 1996-05-13 | 1997-11-28 | Sony Corp | 光磁気記録媒体 |
JPH11213470A (ja) * | 1998-01-22 | 1999-08-06 | Sony Corp | 光磁気ディスク及びその製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005122162A1 (ja) * | 2004-06-09 | 2005-12-22 | Fujitsu Limited | 記録媒体および記録媒体駆動装置向け信号処理装置 |
WO2005122163A1 (ja) * | 2004-06-09 | 2005-12-22 | Fujitsu Limited | 記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004027773A1 (ja) | 2006-01-19 |
AU2002328601A1 (en) | 2004-03-29 |
WO2004027773A1 (ja) | 2004-04-01 |
US7313056B2 (en) | 2007-12-25 |
JP3998684B2 (ja) | 2007-10-31 |
US20050195693A1 (en) | 2005-09-08 |
CN1679100A (zh) | 2005-10-05 |
AU2003220890A1 (en) | 2004-04-08 |
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