公开(公告)号：JPH04271039A

公开(公告)日：1992-09-28

申请号：JP41811090

申请日：1990-12-28

Applicant: SONY CORP

Inventor： OTA MASUMI ,  ARAYA KATSUHISA

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To remarkably enhance recording density and track density by realizing a part to maintain an initializing state, a part to transfer the information of a record holding layer and a part where magnetization is aligned in the direction of regenerated magnetic field in the sight of a lens by using the distribution of temperature generated by the irradiation of reproducing laser beam. CONSTITUTION:A reproducing layer 3 is formed with a material excellent in magneto- optical characteristic like orthoferrite on a transparent base board. Then, the record holding layer 5 is formed with a perpendicular magnetizing film having high coercive force and this layer is coupled with the reproducing layer 3 magnetically. The information signal of the perpendicular magnetization is imparted to the holding layer 5. In order to regenerate this signal, the reproducing layer 3 is aligned by applying initializing magnetic field perpendicular to the reproducing layer 3 beforehand. Then, reading magnetic field Hread in the perpendicular direction and a laser beam LB for heating are applied to the layer 3 and the distribution of the temperature is generated as showin in figure. Although the magnetization of an intermediate layer 4 is unrevealed in a region to be in the temperature of Curie point or above, the magnetization of the layers 3, 4, 5 are aligned in a part P to be in properly temperature and thereby, three different regions are appeared.

公开(公告)号：JPH04255937A

公开(公告)日：1992-09-10

申请号：JP1807091

申请日：1991-02-08

Applicant: SONY CORP

Inventor： OTA MASUMI ,  NAKAO ISAMU

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To enable a magneto-optical recording medium suitable for highly resolutive recording and reproducing to reproduce together with to recording an ordinary magneto-optical driving device. CONSTITUTION:In a magneto-optical recording medium 10 having at least a recording layer 13, a reproducing layer 11 and an intermediate layer 12 interposing the above both layer and reading out a recording signal while changing magnetization of the reproducing layer 11, Curie temperature of the intermediate layer 12 is specified as >=150 deg.C.

公开(公告)号：JPH10188386A

公开(公告)日：1998-07-21

申请号：JP40198

申请日：1998-01-05

Applicant: SONY CORP

Inventor： OTA MASUMI ,  ARAYA KATSUHISA

IPC: G11B11/10 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To provide the signal reproducing method in which the line recording density and the track density are increased and the frequency characteristics are maintained while the reproducing power is increased. SOLUTION: The signal reproducing method is dealing with the magneto-optical recording medium. The medium has a multi-layered film, which is made of a reproducing layer, a middle layer and a recording holding layer in a magnetically coupled manner and data are recorded in the recording holding layer and the direction of the magnetization of the reproducing layer is made independent of the magnetization direction of the recording holding layer in a room temperature. The signal reproducing method has two steps. In the first step, laser light beams are irradiated from the reproducing layer side and a first portion is generated to maintain the condition of a room temperature in the reproducing layer of the laser beams radius by the temperature distribution caused by the irradiation. A second portion is also generated to transfer the magnetic domain pattern of the recording holding layer and a third portion is generated to raise its temperature to the vicinity of the Curie temperature of the middle layer and not to accept the exchange coupling force by the magnetization of the middle layer. In the second step, the magnetized signals of the portion, into which the magnetic domain pattern of the recording holding layer is transferred, are transformed to optical signals by a magneto-optical effect and are read.

公开(公告)号：JPH10143631A

公开(公告)日：1998-05-29

申请号：JP29698596

申请日：1996-11-11

Applicant: SONY CORP

Inventor： OTA MASUMI

IPC: G03B27/46 ,  G06T1/00 ,  G06T1/60 ,  H04N1/21 ,  H04N5/76

Abstract: PROBLEM TO BE SOLVED: To copy a photographic film corresponding to an electronic image at the request of a user who owns the electronic image by converting a film image that is photographed into an electronic image, adding additional information such as a date when a photograph is picked up, etc., to it, maintaining and managing it as electronic data and transmitting the electronic data to where it is needed. SOLUTION: An accepting part RC accepts a photographed film. A developing part DV develops the photographed film. An electronic image part IM converts an image of a film F into an electronic image. An electronic file producing part IP produces an electronic file by uniting the electronic image that is produced by the part IP and various data D about the photographed film. An electronic file database ID stores an electronic file that is produced by the part IP. A transferring part TR has a terminal function that sends the electronic file produced by the part IP to a network.

公开(公告)号：JPH0479038A

公开(公告)日：1992-03-12

申请号：JP19037990

申请日：1990-07-20

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  UDAGAWA TOSHIKI ,  OTA MASUMI

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/125

Abstract: PURPOSE:To perform appropriate recording even when recording density is high by controlling the light emitting power of a light source in accordance with a signal obtained by integrating recording pulse signals. CONSTITUTION:An output signal from a photodiode 6 is converted into a voltage signal and transmitted to a subtracter 14. A light emitting power detecting level is subtracted from a reference power setting level in the subtracter 14, and an error component between the reference power and the detected light emitting power is outputted as a power control signal from an LPF(low-pass filter) 16 and transmitted to a laser light source driving circuit 12, so that the light emitting power is controlled in a direction where the error of the power becomes small. Furthermore, by supplying the output signal obtained by integrating the recording pulse signals in the LPF 18 to the subtracter 17 and subtracting the integration output signal from the output signal from the LPF 16, the controlled variable of the laser light emitting power is corrected to perform correction for restraining the light quantity of light pulse when an interval between pulses is short. Thus, the appropriate recording is performed even in the case of high-density recording.

公开(公告)号：JPH04255939A

公开(公告)日：1992-09-10

申请号：JP1807391

申请日：1991-02-08

Applicant: SONY CORP

Inventor： KANEKO MASAHIKO ,  OTA MASUMI ,  ARAYA KATSUHISA

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To constitute a magneto-optical recording medium to be stable in recording and reproducing properties even when it is repeatedly used. CONSTITUTION:In a magneto-optical recording medium having at least a recording layer and a reproducing layer and reading out a recording signal while changing magnetization of the reproducing layer, the above reproducing layer is formed as an artificial lattice structure which is built up by repeatedly laminating rare earth metallic layer 40RE with transition metallic layer 40TM alternately.

公开(公告)号：JPH04229432A

公开(公告)日：1992-08-18

申请号：JP41502590

申请日：1990-12-27

Applicant: SONY CORP

Inventor： OTA MASUMI ,  ARAYA KATSUHISA

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To reproduce a signal having a period over the diffraction limit of light at high C/N. CONSTITUTION:An exchange-bonded multilayered magnetic recording film is composed of a first magnetic layer as a reproducing layer, a second magnetic layer as a middle layer and a third magnetic layer as a record retaining layer. The Curie temp. and coercive force of each of the magnetic layers are set so that a magnetic domain pattern formed in the first magnetic layer is partially magnified, scaled down or reversed according to the internal temp. distribution of a reproducing spot. The first magnetic layer is an amorphous rare earth element-transition metal alloy film based on Gd-Fe-Co and having

公开(公告)号：JPH0393058A

公开(公告)日：1991-04-18

申请号：JP22939589

申请日：1989-09-06

Applicant: SONY CORP

Inventor： ARAYA KATSUHISA ,  OTA MASUMI

IPC: G11B11/105 ,  G11B11/10

Abstract: PURPOSE:To improve linear recording density and track density by arranging the direction of magnetization in a reproduction layer, and reading while transferring a magnetic signal from a recording holding layer only in an area whose temperature is raised by means of the irradiation of laser light. CONSTITUTION:The direction of magnetization in the reproduction layer 21 is arranged and it is set to a deletion state. Then, the reproduction layer 21 is raised to a prescribed temperature by irradiating the reproduction layer 21 with laser light, while the magnetic signal recorded in the recording holding layer 22 is transferred only in the area heated to the prescribed temperature of the reproduction layer 21 the magnetic signal is converted into an optical signal by a magneto-optical effect and reading is executed. Consequently, there is no influence of the adjacent tracks, crosstalk is cancelled and a signal can be reproduced at high C/N even if track density and linear recording density are high.

公开(公告)号：JPH0668532A

公开(公告)日：1994-03-11

申请号：JP21937992

申请日：1992-08-18

Applicant: SONY CORP

Inventor： OTA MASUMI ,  ARAYA KATSUHISA

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To enable recording and reproducing by magnetic field modulation of a high frequency to be carried out by forming an reproducing layer mainly of GdFeCo, forming a cutting layer and recording layer mainly of ThFeCo and setting the Curie temp. of the cutting layer lower than the Curie temp. of the reproducing layer and the recording layer. CONSTITUTION:The reproducing layer 11 of the magneto-optical recording medium 10 is mainly formed of the GdFeCo and the saturation magnetization MS1 thereof is set smaller than 150emu/cc in the case of the film in which a transition metal is dominant at room temp. The saturation magnetization is set smaller than 160emu/cc in the case of the film in which a rare earth metal is dominant at room temp. The cutting layer 12 is formed mainly of the TbFeCo and the Curie temp. thereof is set at 60 to 200 deg.C to make the temp. lower than that of the layer 11 and the recording layer 13. The layer 13 is formed mainly of the TbFeCo. The saturation magnetization MS3 thereof is set smaller than 100emu/cc in the case of the film in which the transition metal is dominant at room temp. and the MS3 is set smaller than 160emu/cc in the case of the film in which the rare earth metal is dominant at room temp. The layer 13 is formed as the film in which the rare earth make is dominant and the difference between the saturation magnetizations MS1 and MS3 is confined to

公开(公告)号：JPH04255936A

公开(公告)日：1992-09-10

申请号：JP1806891

申请日：1991-02-08

Applicant: SONY CORP

Inventor： ARAYA KATSUHISA ,  KANEKO MASAHIKO ,  OTA MASUMI ,  NAKAO ISAMU

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To obtain a producing method of a magneto-optical recording medium for high density recording. CONSTITUTION:In a producing method of a high density magneto-optical recording medium 10 having at least a reproducing layer 11 and a recording layer 13 and reading out a recorded signal while changing magnetization condition of the reproducing layer 11, the reproducing layer 11 is formed on a substrate 21, another recorded body 30 highly densely recorded in advance is closely adhered on the reproducing layer 11 to transfer a magnetic recording on the high density recording body 30 to the reproducing layer 11 and to form a high density recording magnetic pattern, and, afterward, with forming a film of recording layer 13, magnetic pattern generates on the recording layer 13 at the same time.