公开(公告)号：DE69421464T2

公开(公告)日：2000-02-10

申请号：DE69421464

申请日：1994-07-26

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI

IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/085 ,  G11B7/09 ,  G11B7/26

Abstract: There is provided an optical recording medium (1) including a first pit string having a succession of pits (P) and mirror surface sections (M), which first pit string is formed on one side of a track center (Tc) as a reference, and a second pit string having pits (P) and mirror sections (M), reversed in their array from the pits (P) and the mirror surface sections (M) of the first pit string. A laser beam (L) is radiated onto the track center (Tc) for accessing information signals represented by the pits (P) and the mirror surface sections (M). There are also provided a recording device and a reproducing device for such optical recording medium (1).

公开(公告)号：AT96241T

公开(公告)日：1993-11-15

申请号：AT88106930

申请日：1988-04-29

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  OGAWA HIROSHI

IPC: G11B11/10 ,  G11B11/105

Abstract: An apparatus for reproducing a magneto-optical disk (1) which is adapted to intermittently irradiate a magneto-optical disk with a light beam emitted from a laser light source (5) at a predetermined sampling period, detect a polarized component of the light beam emitted from the laser light source (5) and reflected from the disk (1) by detecting elements (9,8,10,11,12,13A,13B), derive the reproduced output of an information signal recorded on the magneto-optical disk by taking the difference between the detected outputs from the respective detecting elements, and in which there is provided a random noise removing circuit (21A, 21B)at the rear stage of the detecting elements for removing photo-electric converting noises generated in the detecting elements.

公开(公告)号：AT93983T

公开(公告)日：1993-09-15

申请号：AT88903377

申请日：1988-04-15

Applicant: SONY CORP

Inventor： OGAWA HIROSHI ,  HORIMAI HIDEYOSHI

IPC: G11B7/125

公开(公告)号：DE3686480T2

公开(公告)日：1993-03-04

申请号：DE3686480

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：DE3771763D1

公开(公告)日：1991-09-05

申请号：DE3771763

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：EP0580876A4

公开(公告)日：1994-10-19

申请号：EP93904325

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

CPC classification number: H03M5/14 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/0943 ,  G11B7/14 ,  G11B7/261 ,  G11B20/1423

公开(公告)号：DE69421464D1

公开(公告)日：1999-12-09

申请号：DE69421464

申请日：1994-07-26

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI

IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/085 ,  G11B7/09 ,  G11B7/26

Abstract: There is provided an optical recording medium (1) including a first pit string having a succession of pits (P) and mirror surface sections (M), which first pit string is formed on one side of a track center (Tc) as a reference, and a second pit string having pits (P) and mirror sections (M), reversed in their array from the pits (P) and the mirror surface sections (M) of the first pit string. A laser beam (L) is radiated onto the track center (Tc) for accessing information signals represented by the pits (P) and the mirror surface sections (M). There are also provided a recording device and a reproducing device for such optical recording medium (1).

公开(公告)号：DE69319390D1

公开(公告)日：1998-08-06

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：SG84894G

公开(公告)日：1994-10-14

申请号：SG84894

申请日：1994-06-28

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  AOKI YOSHIO ,  WATANABE KENJIRO

IPC: G11B11/10 ,  G11B13/04

公开(公告)号：DE3885000D1

公开(公告)日：1993-11-25

申请号：DE3885000

申请日：1988-04-29

Applicant: SONY CORP

Inventor： HORIMAI HIDEYOSHI ,  OGAWA HIROSHI

IPC: G11B11/10 ,  G11B11/105

Abstract: An apparatus for reproducing a magneto-optical disk (1) which is adapted to intermittently irradiate a magneto-optical disk with a light beam emitted from a laser light source (5) at a predetermined sampling period, detect a polarized component of the light beam emitted from the laser light source (5) and reflected from the disk (1) by detecting elements (9,8,10,11,12,13A,13B), derive the reproduced output of an information signal recorded on the magneto-optical disk by taking the difference between the detected outputs from the respective detecting elements, and in which there is provided a random noise removing circuit (21A, 21B)at the rear stage of the detecting elements for removing photo-electric converting noises generated in the detecting elements.