公开(公告)号：EP0152265A3

公开(公告)日：1985-10-30

申请号：EP85300764

申请日：1985-02-05

Applicant: Toyo Boseki Kabushiki Kaisha ,  Kabushiki Kaisha Nippon Magphane

Inventor： Kuze, Katsuaki ,  Nishino, Yasuhiro ,  Matsuyama, Yujiro ,  Maeda, Kozo ,  Kobayasi, Masahiro ,  Okudaira, Tadashi ,  Hongo, Tsuyoshi ,  Makimura, Osamu

IPC: C08J05/18 ,  G11B05/704 ,  G11B05/64

CPC classification number: C08K3/26 ,  C08J5/18 ,  C08J2367/02 ,  C08K3/22 ,  C08K3/36 ,  G11B5/733 ,  Y10S428/90 ,  Y10S428/91 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/259 ,  Y10T428/31786 ,  C08L67/02

Abstract: An oriented polyester film comprising a polyester derived from ethylene terephthalate as the major monomeric unit; from 0.01 to 1.0% by weight of silica and/or titanium dioxide particles having an average size of 0.01 to 0.5 µm; and from 0.005 to 1.0% by weight of calcium carbonate particles having an average particle size of 0.01 to 0.5 µm. It can be used as the base film for a video tape.

公开(公告)号：EP0088635A3

公开(公告)日：1984-08-29

申请号：EP83301292

申请日：1983-03-09

Applicant: TORAY INDUSTRIES, INC.

Inventor： Ono, Masaaki ,  Miura, Yasuki ,  Motegi, Masahiko ,  Okabe, Kazuo

IPC: H01F10/26 ,  G11B05/64

CPC classification number: B32B27/08 ,  B32B3/30 ,  B32B15/08 ,  B32B27/18 ,  B32B27/28 ,  B32B27/36 ,  B32B2307/208 ,  B32B2307/518 ,  G11B5/64 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24388 ,  Y10T428/24405 ,  Y10T428/24421 ,  Y10T428/24446 ,  Y10T428/24851 ,  Y10T428/31663 ,  Y10T428/31786 ,  Y10T428/31797 ,  Y10T428/31801

Abstract: A laminated film for a super-high density magnetic recording medium, comprises (A) a layer 5 composed of a thermoplastic resin and (B) a layer 1 of a thermoplastic resin containing fine particles therein. In this laminated film, the outer surface of the layer (A) has a surface roughness of less than 0.005µ as expressed as the Ra value, and the outer surface of the layer (B) has a surface roughness of 0.005 to 0.040µ as expressed as the Ra value. The outer surface of the layer (B) has either (i) a plurality of depressions and a plurality of protrusions, which are formed thereon in a configuration such that at least one protrusion 3 exists within each depression 2 or at least one protrusion exists in the area where two or more depressions are contiguous to each other, or (ii) protrusions on a flat plane and a covering layer (C) composed of a lubricant, which is formed on the surface of the layer (B). This covering layer (C) may be formed on the surface having the above-mentioned depressions 2 and protrusions 3. The covering layer (C) is a continuous film layer or a discontinuous film layer formed of worm-like nodules. When a ferromagnetic metan thin film is formed on the surface of the layer (A) by vacuum evaporation and a protective film layer is formed on this thin film, there is obtained a vacuum-deposited video tape excellent in the running property and electromagnetic transformation performances. In this vacuum-deposited video tape, the transfer of the surface configuration due to the coarseness of the running surface can be prevented.

公开(公告)号：EP0068131A3

公开(公告)日：1983-07-13

申请号：EP82104238

申请日：1982-05-14

Applicant: International Business Machines Corporation

Inventor： Aboaf, Joseph Adam ,  Klokholm, Erik ,  Herd, Sigrid Renee

IPC: H01F10/16 ,  H01F41/18 ,  G11B05/64

CPC classification number: G11B5/656 ,  H01F41/18 ,  Y10S428/928 ,  Y10T428/12431

Abstract: This invention relates to a magnetic recording medium comprising a sputtered polycrystalline film of material having the formula Co x Pt y where x (Co) is up to 90 atomic percent of said material and y (Pt) is from 10 to 30 atomic of said material. The film has a magnetostriction value of from -35 x 10- 8 to a value near substantially zero magnetostriction in the range of ± 10 x 10- 6 . The material has a coercivity H c of from 500 to 2000 oersteds with a saturation magnetization of 400 gauss to 15,000 gauss.

公开(公告)号：EP0203604A3

公开(公告)日：1988-07-13

申请号：EP86107299

申请日：1986-05-28

Applicant: TEIJIN LIMITED

Inventor： Katoh, Hideo ,  Hasegawa, Kinji

IPC: G11B05/64 ,  G11B05/704

CPC classification number: G11B5/735 ,  G11B5/73 ,  Y10S428/90 ,  Y10S428/91 ,  Y10T428/24355 ,  Y10T428/24372 ,  Y10T428/25 ,  Y10T428/31786

Abstract: The invention relates to a biaxially oriented polyester film for use in thin metallic film-type magnetic recorcing media, said polymester film having a first surface to which a thin metallic film as a magnetic recording layer is to be applied and a second surface coated with an easily slippable layer composed of an organic polymeric binder and inert fine solid particles dispersed therein, the first surface having (a) large protrusions with a diameter of 0.2 to 2 micrometers and a height ot 20 to 200 angstrom distributed at a density of at least 10 3 but less than 10 6 per mm 2 , and (b) small protrusions with a diameter of 0.01 to 0.1 micrometer and a height of 10 to 100 angstrom distributed at a density of from 10 6 up to 10 9 .

公开(公告)号：EP0151445A3

公开(公告)日：1987-09-30

申请号：EP85100803

申请日：1985-01-26

Applicant: Hitachi Maxell Ltd.

Inventor： Wakai, Kunio ,  Niimi, Hideaki ,  Isoe, Noboru

IPC: G11B05/64 ,  G11B05/85

CPC classification number: C23C14/027 ,  C23C14/0021 ,  G11B5/64 ,  G11B5/85 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/24413 ,  Y10T428/24942

Abstract: A magnetic recording medium comprising a substrate and, as a recording layer, a ferromagnetic metal thin layer formed on the substrate by deposition, in which the ferromagnetic metal thin layer contains oxygen atom in such a manner that concentrations of oxygen atom in a surface layer and an interfacial layer adjacent to the substrate are higher than that in an intermediate layer between the surface and interfacial layers, which has improved coercive force and smaller magnetic domain.

公开(公告)号：EP0187169A3

公开(公告)日：1987-01-28

申请号：EP84116338

申请日：1984-12-27

Applicant: HITACHI METALS, LTD.

Inventor： Endo, Juro ,  Murakami, Shiro ,  Fujii, Shigeo ,  Nakao, Masayuki ,  Iimura, Tsutomu

IPC: G11B05/84 ,  H01F41/18 ,  G11B05/64 ,  H01F10/16

CPC classification number: G11B5/851 ,  G11B5/64

Abstract: A process of manufacturing Co-Ni magnetic recording media by sputtering Co-Ni thin film layer on a substrate in Argon atmosphere including nitrogen and heating the thin film to evaporate nitrogen from the thin film to prepare the magnetic recording media appropriate for high density longitudinal recording, wherein on sputtering the substrate is maintained at a temperature of room temperature to 300°C.

公开(公告)号：EP0158338A3

公开(公告)日：1987-01-14

申请号：EP85104338

申请日：1985-04-10

Applicant: HITACHI, LTD. ,  Hitachi Maxell Ltd.

Inventor： Futamoto, Masaaki ,  Honda, Yukio ,  Uesaka, Yasutaro ,  Yoshida, Kazuetsu

IPC: G11B05/66 ,  G11B05/64

CPC classification number: G11B5/667 ,  G11B5/66 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12674

Abstract: Disclosed is a perpendicular magnetic recording medium wherein an under layer (2) made of a material containing Si and/or Ge as its principal ingredient is deposited on a substrate (1), and a perpendicular magnetic film (3) made of a Co-based alloy is deposited on the under layer. With the perpendicular magnetic recording medium, the perpendicular magnetic film has an enhanced degree of C-axis orientation, and the bond strength between the perpendicular magnetic film and the substrate is also enhanced when the substrate is non-metallic.

公开(公告)号：EP0116881A3

公开(公告)日：1986-10-22

申请号：EP84101074

申请日：1984-02-02

Applicant: KONISHIROKU PHOTO INDUSTRY CO. LTD.

Inventor： Naoe, Masahiko ,  Ishibashi, Shozo

IPC: G11B05/64 ,  G11B05/84 ,  H01F10/18

CPC classification number: G11B5/64 ,  G11B5/84 ,  H01F10/18

Abstract: A magnetic recording medium comprising a substrate and a magnetic layer thereon, the magnetic layer
(a) being a continuous magnetic layer made mainly from iron oxides, and (b) having not less than 0.5 of ratio between perpendicular-to-plane residual magnetization and in-plane residual magnetization of said magnetic layer, M V 'M H . A process of manufactuing a magnetic recording medium comprising a substrate and a continuous magnetic layer made mainly from iron oxides formed thereon and having not less than 0.5 of ratio between perpendicular-to-plane residual magnetization, M v , and in-plane residual magnetization, M H , of magnetic layer: M V /M H , comprising causing particles to be component of said magnetic layer to fly and be deposited on said substrate.

Abstract translation: 一种磁记录介质，包括基板和磁性层，所述磁性层（a）是主要由铁氧化物构成的连续磁性层，和（b）在垂直于平面之间的剩余磁化强度和 所述磁性层的平面内剩余磁化强度，MV / MH。 一种制造磁记录介质的方法，该磁记录介质包括主要由形成在其上的铁氧化物形成的基板和连续磁性层，并且具有不小于平面之间的剩余磁化强度，MV和面内剩余磁化强度之比的0.5; MH 的磁性层：MV / MH，包括使颗粒成为所述磁性层的组分飞散并沉积在所述衬底上。

公开(公告)号：EP0109481A3

公开(公告)日：1986-03-19

申请号：EP83105929

申请日：1983-06-16

Applicant: International Business Machines Corporation

Inventor： Weiss, Joel Richard

IPC: G11B05/64 ,  G11B05/82

CPC classification number: G11B5/72 ,  G11B5/64

Abstract: A magnetic recording disk is formed with a silicon substrate, the surfaces of which are essentially free of asperities. A non-magnetic undercoat layer is coated on one or both surfaces of the substrate. A magnetic layer is applied to the free surface of the or each undercoat layer. A non-magnetic overcoat layer is applied to the or each magnetic layer.

公开(公告)号：EP0119869A3

公开(公告)日：1985-10-23

申请号：EP84301931

申请日：1984-03-21

Applicant: HITACHI METALS, LTD. ,  HITACHI, LTD.

Inventor： Sakakihara, Masahiko ,  Hasegawa, Kenzi ,  Iwama, Akira

IPC: H01F10/28 ,  G11B05/64

CPC classification number: G11B5/7315 ,  H01F10/28 ,  Y10S428/90 ,  Y10T428/1157

Abstract: A non-magnetic substrate material represented by the general formula, Ni x Mn 2-x O 2 , where 0.05