公开(公告)号：CA1310113C

公开(公告)日：1992-11-10

申请号：CA525412

申请日：1986-12-16

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  KAWAKUBO OSAMU ,  AOKI YOSHIO

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/00 ,  G11B13/04

Abstract: Disclosed is herein a magneto-optical recording system comprising: preparing a magnetooptical recording medium comprising a magneto-optical recording layer and a bias magnetic field formed on a transparent substrate, the magneto-optical recording layer having Curie temperature higher than room temperature, the bias magnetic layer having compensation temperature higher than Curie temperature, the magnetooptical recording layer and the bias magnetic layer being superposed having a nonmagnetic layer therebetween, and applying heating means to the magnetooptical recording medium having first and second heating power levels, the first heating power level being selected enough to heat the magneto-optical recording layer higher than the Curie temperature of the magnetooptical recording layer and to heat the bias magnetic layer higher than the compensation temperature of the bias magnetic layer, the second heating power level being selected enough to heat the magneto-optical recording layer higher than the Curie temperature of the magneto-optical recording layer while keeping the bias magntic layer below the compensation temperature of the bias magnetic layer.

公开(公告)号：AT79686T

公开(公告)日：1992-09-15

申请号：AT86310117

申请日：1986-12-23

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  KAWAKUBO OSAMU ,  AOKI YOSHIO

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/00 ,  G11B13/04

Abstract: A magneto-optical recording technique comprises: preparing a magneto-optical recording medium (10) comprising a magneto-optical recording layer (12) and a bias magnetic layer (14) formed on a transparent substrate (11), the recording layer (12) having a Curie temperature higher than room temperature, the bias magnetic layer (14) having a compensation temperature lower than a Curie temperature, and the recording layer (12) and the bias magnetic layer (14) being superposed with a non-magnetic layer (13) therebetween; and applying heating (for example by means of a laser beam L.B) to the magneto-optical recording medium (10) at first and second heating power levels, the first level being sufficient to heat the recording layer (12) to a temperature higher than the Curie temperature of the recording layer (12) and to heat the bias magnetic layer (14) to a temperature higher than the compensation temperature of the bias magnetic layer (14), and the second level being sufficient to heat the recording layer (12) to a temperature higher than the Curie temperature of the recording layer (12) while keeping the bias magnetic layer (14) below the compensation temperature of the bias magnetic layer (14).

公开(公告)号：AT65860T

公开(公告)日：1991-08-15

申请号：AT87105809

申请日：1987-04-21

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  AOKI YOSHIO

IPC: G11B11/10 ,  G11B11/105 ,  G11B13/04

Abstract: A magnetooptical recording apparatus is disclosed which is capable of performing real-time overwrite operation. The apparatus comprises a laser beam (3) and focusing parts (4) thereof and a pulse magnetic field generator device (6) provided on both sides of a magnetooptical recording medium (1) respectively. The laser beam (3) and focusing parts (4) thereof are formed of an objective lens (5) connected to a moving coil (8) which is provided in a magnet (7), thus the objective lens (5) is movable relative to a magnetic layer (1A) of the magnetooptical recording medium (1) by the interaction between the magnet (7) and the moving coil (8). The magnet (7) generates and applies a D.C. magnetic field of one polarity perpendicular to the magnetic thin film (1A) around a point (P) where the laser beam (3) is focused. While the pulse magnetic field generator device (6) generates pulse magnetic field of the opposite polarity modulated by information signal around the point (P) where the laser beam (3) is focused. Thus one and opposite polarity magnetic field pulse row obtained by a sum of the D.C. magnetic field and the pulse magnetic field is applied to the magnetic thin film (1A) upon laser beam (3) irradiation to perform the real-time overwrite operation.

公开(公告)号：AU6659386A

公开(公告)日：1987-07-02

申请号：AU6659386

申请日：1986-12-16

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  KAWAKUBO OSAMU ,  AOKI YOSHIO

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/00 ,  G11B13/04 ,  G11B7/26

Abstract: A magneto-optical recording technique comprises: preparing a magneto-optical recording medium (10) comprising a magneto-optical recording layer (12) and a bias magnetic layer (14) formed on a transparent substrate (11), the recording layer (12) having a Curie temperature higher than room temperature, the bias magnetic layer (14) having a compensation temperature lower than a Curie temperature, and the recording layer (12) and the bias magnetic layer (14) being superposed with a non-magnetic layer (13) therebetween; and applying heating (for example by means of a laser beam L.B) to the magneto-optical recording medium (10) at first and second heating power levels, the first level being sufficient to heat the recording layer (12) to a temperature higher than the Curie temperature of the recording layer (12) and to heat the bias magnetic layer (14) to a temperature higher than the compensation temperature of the bias magnetic layer (14), and the second level being sufficient to heat the recording layer (12) to a temperature higher than the Curie temperature of the recording layer (12) while keeping the bias magnetic layer (14) below the compensation temperature of the bias magnetic layer (14).

公开(公告)号：DE69726695D1

公开(公告)日：2004-01-22

申请号：DE69726695

申请日：1997-10-01

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  TOBITA MINORU ,  FUJITA GORO ,  TOSAKA SUSUMU

IPC: G11B7/0037 ,  G11B7/007 ,  G11B7/09 ,  G11B7/135 ,  G11B7/14 ,  G11B7/26 ,  G11B11/105 ,  G11B7/00

Abstract: A format of a recording medium suitable for a larger capacity, a higher transfer rate, and integration of pits/lands/grooves is provided. In a first method, in a recordable and reproduceable area, a twin-track structure of lands/grooves is configured such that tracks on which lands become recording tracks and tracks on which grooves become recording tracks form a double spiral. In a read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in a data area. In a second method, in a recordable and reproduceable area, a land/groove-alternate track structure is configured such that grooves become data recording tracks in the circular track next to the circular track in which lands become data recording tracks, and lands become data recording tracks in the next circular track. In the read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in the data area.

公开(公告)号：DE69330503T2

公开(公告)日：2002-03-28

申请号：DE69330503

申请日：1993-02-19

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  FUJITA GORO

IPC: G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/14 ,  G11B7/26 ,  G11B20/14 ,  H03M5/14 ,  G11B7/00 ,  G11B7/095

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

公开(公告)号：DE69324858D1

公开(公告)日：1999-06-17

申请号：DE69324858

申请日：1993-02-19

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  FUJITA GORO

IPC: G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/14 ,  G11B7/26 ,  G11B20/14 ,  H03M5/14 ,  G11B7/00 ,  G11B7/095

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

公开(公告)号：DE69319390T2

公开(公告)日：1998-10-29

申请号：DE69319390

申请日：1993-09-02

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI

IPC: G11B20/12 ,  G11B7/004 ,  G11B7/013 ,  G11B7/09 ,  G11B7/26 ,  G11B11/105 ,  G11B20/10 ,  G11B20/14 ,  G11B11/10

Abstract: A recording medium such as an optical or magneto-optical disk is divided into servo areas and data areas and at least one of plural pits in each servo area is formed with a phase deviation. An apparatus for recording data on and/or reproducing data from the recording medium comprises: a light source for irradiating the recording medium; a photoelectric conversion means for receiving the light emitted from the light source and reflected from or transmitted through the recording medium, and converting the received light into an RF signal; a signal conversion means for converting the RF signal into a binary signal corresponding to the pit formed on the recording medium; and a detection means for detecting the servo area on the recording medium on the basis of the phase deviation of the binary signal outputted from the signal conversion means; wherein data is recorded or reproduced while a servo action is executed in accordance with the servo byte in the servo area detected by the detection means. The servo area is detectable with facility, and data of any pit pattern can be recorded and/or reproduced properly.

公开(公告)号：DE3789663T2

公开(公告)日：1994-08-18

申请号：DE3789663

申请日：1987-07-16

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  AOKI YOSHIO

IPC: G11B11/10 ,  G11B5/02 ,  G11B11/105

Abstract: An opto magnetic recording medium (1,2,3) is irradiated by a laser (4) in correspondence to information signals only after a magnetic field sufficient to invert the medium's magnetisation direction has been imposed (7,8) on the medium. A light modulator (13) normally supplies requisite drive current to a laser system (5,4) for irradiation of a recording medium but does not supply this current for a set time, e.g., determined by a monostable multivibrator, after it receives input from a signal inversion detector (12).

公开(公告)号：DE3789663D1

公开(公告)日：1994-05-26

申请号：DE3789663

申请日：1987-07-16

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  AOKI YOSHIO

IPC: G11B11/10 ,  G11B5/02 ,  G11B11/105

Abstract: An opto magnetic recording medium (1,2,3) is irradiated by a laser (4) in correspondence to information signals only after a magnetic field sufficient to invert the medium's magnetisation direction has been imposed (7,8) on the medium. A light modulator (13) normally supplies requisite drive current to a laser system (5,4) for irradiation of a recording medium but does not supply this current for a set time, e.g., determined by a monostable multivibrator, after it receives input from a signal inversion detector (12).