公开(公告)号：AU1499700A

公开(公告)日：2000-08-24

申请号：AU1499700

申请日：2000-02-09

Applicant: SONY CORP

Inventor： KASAMI YUTAKA ,  SEO KATSUHIRO ,  KAWAKUBO OSAMU

IPC: G11B7/0045 ,  G11B7/006 ,  G11B7/24 ,  G11B7/254 ,  G11B7/257 ,  G11B7/258 ,  G11B7/30

Abstract: A phase change optical recording medium which enables optimum direct overwrite even under high speed high density conditions without degrading repetition durability or storage stability of recorded signals. To this end, the phase change optical recording medium has a recording layer formed at least of a phase change material and is recorded and/or reproduced with a laser light beam having a wavelength ranging between 380 nm and 420 nm. A ratio Ac/Aa, where Ac is the absorption rate of said recording layer in a crystalline state and Aa is the absorption rate of said recording layer in an amorphous state, is not less than 0.9, and a crystallization promoting layer promoting the crystallization of the phase change material is contacted with at least one surface of the recording layer. By exploiting the absorption rate control and the crystallization promotion in combination, it is possible to positively compensate the difference between the physical properties of the crystal phase and those of the amorphous phase to realize optimum direct overwrite.

公开(公告)号：DE3781252T2

公开(公告)日：1993-03-04

申请号：DE3781252

申请日：1987-12-10

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  KAWAKUBO OSAMU ,  OKADA HITOSHI ,  MAEDA TAMOTSU ,  TOSAKA SUSUMU

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04 ,  G02F1/00

Abstract: Magnet rotation control apparatus includes a first coil (12) for rotating a permanent magnet (11) so as to invert the polarity of its magnetic field applied to an optical recording disc (10), and a second coil (13) provided at a position displaced from the central axis of the first coil (12) and for applying a driving force to the permanent magnet (11) when the magnet begins to rotate. The permanent magnet (11) can settle in a relatively short time after being inverted, by controlling a drive current applied to the second coil (13).

公开(公告)号：AU583968B2

公开(公告)日：1989-05-11

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：MXPA00001574A

公开(公告)日：2007-06-29

申请号：MXPA00001574

申请日：2000-02-15

Applicant: SONY CORP

Inventor： KASAMI YUTAKA ,  KAWAKUBO OSAMU

IPC: G11B7/25 ,  G11B7/0045 ,  G11B7/006 ,  G11B7/24 ,  G11B7/254 ,  G11B7/257 ,  G11B7/258

Abstract: Un medio de registro optico de cambio de fase que permite la sobreescritura directa optima aun bajo condiciones de densidad y alta velocidad sin degradar la durabilidad de repeticion o la estabilidad de almacenamiento de las senales registradas. Para este fin, el medio de registro optico de cambio de fase tiene una capa de registro formada por lo menos de un material de cambio de fase y se registra y/o reproduce con un haz de luz laser que tiene una longitud de onda que varia entre 380 nanometros y 420 nanometros. Una relacion de Ac/Aa, en donde Ac es el regimen de absorcion de la capa de registro en un estado cristalino y Aa es el regimen de absorcion de la capa de registro en un estado amorfo, es no menor de 0.9, y una capa promotora de cristalizacion promueve la cristalizacion del material de cambio de fase en contacto con por lo menos una superficie de la capa de registro. Explotando el control del regimen de absorcion y la promocion de cristalizacion en combinacion, es posible compensar de manera positiva la diferencia entre las propiedades fisicas de la fase de cristal y aquellas de la fase amorfa para obtener una sobreescritura directa optima.

公开(公告)号：BR0000895A

公开(公告)日：2000-09-12

申请号：BR0000895

申请日：2000-02-21

Applicant: SONY CORP

Inventor： KASAMI YUTAKA ,  KAWAKUBO OSAMU ,  SEO KATSUHIRO

IPC: G11B7/0045 ,  G11B7/006 ,  G11B7/24 ,  G11B7/254 ,  G11B7/257 ,  G11B7/258 ,  G11B7/30

Abstract: A phase change optical recording medium which enables optimum direct overwrite even under high speed high density conditions without degrading repetition durability or storage stability of recorded signals. To this end, the phase change optical recording medium has a recording layer formed at least of a phase change material and is recorded and/or reproduced with a laser light beam having a wavelength ranging between 380 nm and 420 nm. A ratio Ac/Aa, where Ac is the absorption rate of said recording layer in a crystalline state and Aa is the absorption rate of said recording layer in an amorphous state, is not less than 0.9, and a crystallization promoting layer promoting the crystallization of the phase change material is contacted with at least one surface of the recording layer. By exploiting the absorption rate control and the crystallization promotion in combination, it is possible to positively compensate the difference between the physical properties of the crystal phase and those of the amorphous phase to realize optimum direct overwrite.

公开(公告)号：SG64485A1

公开(公告)日：1999-04-27

申请号：SG1998000583

申请日：1998-03-19

Applicant: SONY CORP

Inventor： KASHIWAGI TOSHIYUKI ,  KAWAKUBO OSAMU ,  NAKAOKI ARIYOSHI ,  KANEKO MASAHIKO

IPC: G11B7/24065 ,  G11B7/007 ,  G11B7/013 ,  G11B7/12 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/24079 ,  G11B7/26 ,  G11B7/24 ,  G11B7/135

Abstract: An optical recording medium according to the present invention includes a base layer having an information signal portion formed on a surface on the side on which laser light is incident, and a light transmissive layer formed on the base layer. A thickness t of the light transmissive layer is within the range of t = 3 to 177 mu m at least in an area of the information signal portion. If unevenness of the light transmissive layer is DELTA t, N.A. of an optical system for reproduction or recording and reproduction and a wavelength lambda satisfies DELTA t ≤ +/- 5.26 ( lambda /N.A. ) ( mu m). A track pitch is P and a skew is THETA , then P ≤ 0.64 mu m and THETA ≤ +/-84.115 DEG ( lambda /N.A. /t) are satisfied. The optical recording medium is recorded or reproduced by a recording and reproducing system satisfying lambda ≤ 0.68 mu m and N.A./ lambda ≥ 1.20. The optical recording medium permits a recording capacity of 8 GB.

公开(公告)号：ID26445A

公开(公告)日：2001-01-04

申请号：ID20000124

申请日：2000-02-17

Applicant: SONY CORP

Inventor： KASAMI YUTAKA ,  KAWAKUBO OSAMU ,  SEO KATSUHIRO

IPC: G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/125 ,  G11B7/24 ,  G11B7/243 ,  G11B7/253 ,  G11B7/2534 ,  G11B7/254 ,  G11B7/2542 ,  G11B7/257 ,  G11B7/258 ,  G11B7/2585 ,  G11B7/259 ,  G11B7/2595 ,  G11B7/00

Abstract: A phase change optical recording medium which enables optimum direct overwrite even under high speed high density conditions without degrading repetition durability or storage stability of recorded signals. To this end, the phase change optical recording medium has a recording layer (2) formed at least of a phase change material and is recorded and/or reproduced with a laser light beam having a wavelength ranging between 380 nm and 420 nm. A ratio Ac/Aa, where Ac is the absorption rate of said recording layer in a crystalline state and Aa is the absorption rate of said recording layer (2) in an amorphous state, is not less than 0.9, and a crystallization promoting layer (3,4) promoting the crystallization of the phase change material is contacted with at least one surface of the recording layer (2). By exploiting the absorption rate control and the crystallization promotion in combination, it is possible to positively compensate the difference between the physical properties of the crystal phase and those of the amorphous phase to realize optimum direct overwrite.

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：DE3781252D1

公开(公告)日：1992-09-24

申请号：DE3781252

申请日：1987-12-10

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  KAWAKUBO OSAMU ,  OKADA HITOSHI ,  MAEDA TAMOTSU ,  TOSAKA SUSUMU

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04 ,  G02F1/00

Abstract: Magnet rotation control apparatus includes a first coil (12) for rotating a permanent magnet (11) so as to invert the polarity of its magnetic field applied to an optical recording disc (10), and a second coil (13) provided at a position displaced from the central axis of the first coil (12) and for applying a driving force to the permanent magnet (11) when the magnet begins to rotate. The permanent magnet (11) can settle in a relatively short time after being inverted, by controlling a drive current applied to the second coil (13).

公开(公告)号：CA1240360A

公开(公告)日：1988-08-09

申请号：CA478803

申请日：1985-04-11

Applicant: SONY CORP

Inventor： KAWAKUBO OSAMU ,  MUNEMOTO EIJI ,  OKUBORA AKIHIKO

IPC: H01J9/02 ,  H01J17/06 ,  H01J17/49

Abstract: The present invention discloses a method of producing a discharge display device which enables formation of a satisfactory LaB6 cathode without using a LaB6 paste containing a glass binder. The method of the present invention comprises the steps of applying a conductive paste containing a glass binder, temporarily drying said conductive paste to form a conductive paste layer, forming a LaB6 layer containing no glass binder on said conductive paste layer, burning said conductive paste layer and said LaB6 layer, at the same time, and activating said LaB6 layer after being burnt, and after an exhausting step by gas discharge with large current to form a LaB6 cathode.