公开(公告)号：EP0084797A3

公开(公告)日：1985-10-16

申请号：EP83100179

申请日：1983-01-12

Applicant: Agfa-Gevaert AG

Inventor： Brinkmeyer, Herman, Dr. ,  Perrey, Hermann, Dr. ,  Hübler, Gerhard, Dr. ,  Nippe, Burkhard, Dr. ,  Kober, Heinrich, Dr.

IPC: G11B05/70

CPC classification number: G11B5/7026 ,  G11B5/7023

公开(公告)号：EP0123258A3

公开(公告)日：1985-09-18

申请号：EP84104340

申请日：1984-04-17

Applicant: TORAY INDUSTRIES, INC.

Inventor： Tanaka, Kazuhiro ,  Kawakami, Ken-ichi ,  Yoshii, Toshiya

IPC: G11B05/82 ,  G11B05/70 ,  G11B05/64 ,  B32B27/08

CPC classification number: G11B5/825 ,  G11B5/7315 ,  Y10S428/90 ,  Y10S428/91 ,  Y10T428/24372 ,  Y10T428/24612 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/26 ,  Y10T428/264 ,  Y10T428/265 ,  Y10T428/31786 ,  Y10T428/31797 ,  Y10T428/31938

Abstract: @ A magnetic recording disk which comprises (1) a three-layered laminate consisting of a core layer of a biaxially oriented polyolefinfilm which has a birefringence of not more than 0.01 and an amorphous-region orientation coefficient of not more than 0.2 and two outer layers of a biaxially oriented polyester film adhered to said core layer, and (2) a magnetic layer formed on at least one side of the laminate. The magnetic recording disk of the invention undergoes only slight dimensional changes with variations in humidity and temperature, and the dimensional changes are isotropic in the plane. The disk therefore has an excellent electromagnetic properties such as output fluctuation and outbreak of dropouts caused by the environmental change.

公开(公告)号：EP0078539A3

公开(公告)日：1985-09-11

申请号：EP82110098

申请日：1982-11-02

Applicant: FUJI PHOTO FILM CO., LTD.

Inventor： Asai, Takamitsu ,  Kitamoto, Tatsuji ,  Akashi, Goro

IPC: G11B05/84 ,  G11B05/70 ,  H01F01/11 ,  H01F01/08

CPC classification number: G11B5/845 ,  G11B5/70626 ,  G11B5/7085

Abstract: The present invention relates to an improved method for preparing a magnetic recording method having excellent magnetic orientation comprising the steps of 1) dispersing ferromagnetic fine particles which are plate-shaped and which have an axis of magnetization perpendicular to the plates of the particles in a binder and 2) coating a magnetic coating layer on a non-magnetic support wherein the method comprises, after coating the magnetic coating layer and before drying it, subjecting the surface of the magnetic layer to a magnetic field from the direction perpendicular to the support to produce a magnetic orientation while contacting the surface of the magnetic layer with a flexible smoothening sheet.

公开(公告)号：EP0069349A3

公开(公告)日：1984-10-10

申请号：EP82105877

申请日：1982-07-01

Applicant: Kabushiki Kaisha Toshiba

Inventor： Ido, Tadashi ,  Yokoyama, Hirotaka ,  Wada, Moriyasu ,  Oguchi, Toshihiko ,  Ishizawa, Akio ,  Koike, Yoshiyasu

IPC: G11B05/70 ,  H01F01/113 ,  H01F01/11

CPC classification number: G11B5/70 ,  G11B5/70678 ,  G11B5/714 ,  G11B5/845 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/258

Abstract: Disclosed is a magnetic recording medium comprising substrate and a resinous composition containing magnetic particles of uniaxially-anisotropic hexagonal crystals having particle diameters of 0.01 - 0.3 µm and coated on said substrate; the ratio of remanent magnetization to saturation magnetization on the magnetization curve corrected to demagnetizing field which is measured in a direction vertical to the surface of the recording medium, ranging from 0.3 to 0.7. This magnetic recording medium requires no orientation treatment for its production.

公开(公告)号：EP0069955A3

公开(公告)日：1983-09-07

申请号：EP82105967

申请日：1982-07-05

Applicant: Agfa-Gevaert AG

Inventor： Kohler, Robert, Dr. ,  Nippe, Burkhard, Dr. ,  Kober, Heinrich, Dr. ,  Schilffarth, Karlchristian, Dr. ,  Meckel, Walter, Dr. ,  Quiring, Bernd, Dr.

IPC: G11B05/70

CPC classification number: G11B5/7021 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935 ,  Y10T428/31942

公开(公告)号：EP0054269A3

公开(公告)日：1983-08-10

申请号：EP81110352

申请日：1981-12-11

Applicant: TEIJIN LIMITED

Inventor： Kadokura, Sadao ,  Tomie, Takashi ,  Naoe, Masahiko

IPC: G11B05/64 ,  G11B05/84 ,  G11B05/70

CPC classification number: G11B5/64 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/31678

Abstract: Magnetic recording medium conventionally utilizes the in-plane magnetization mode, but, recently, the perpendicular magnetization mode utilizing the perpendicular anisotropy of an hcp cobalt alloy layer, in which C axis is oriented normal to the layer surface, is proposed. The known perpendicular magnetic recording medium has been produced by an RF sputtering, but such medium is of too low flexibility to use it in the form of a magnetic tape. In addition, the production rate of the perpendicular magnetic recording medium by RF sputtering is very low. The perpendicular magnetic recording medium is very flexible due to particle pattern (Figures 10, 12 and 13) completely distinct from the conventional columnar pattern (Figures 8 and 11). In addition, the production rate is high, because the base (20) is located beside a space between the targets (T,, T 2 ) of a sputtering device and further the magnetic field is generated perpendicularly to the sputtering surfaces (T 1s , T 25 ) by a field coil (31) or magnets (32,33). The present invention makes it possible to commercially produce the perpendicular magnetic recording medium, especially in the tape form.

公开(公告)号：EP0024692A3

公开(公告)日：1981-08-26

申请号：EP80104974

申请日：1980-08-21

Applicant: BASF Aktiengesellschaft

Inventor： Steck, Werner, Dr. ,  Sarnecki, Wilhelm, Dr. ,  Marosi, Laszlo, Dr. ,  Ohlinger, Manfred, Dr. ,  Autzen, Horst, Dr.

IPC: H01F01/06 ,  B22F09/22 ,  G11B05/70

CPC classification number: B22F9/22 ,  H01F1/061 ,  H01F1/065