公开(公告)号：WO1983001145A1

公开(公告)日：1983-03-31

申请号：PCT/JP1982000390

申请日：1982-09-27

Applicant: SONY CORPORATION ,  KUBOTA, Isao

Inventor： SONY CORPORATION

IPC: G11B05/70

CPC classification number: G11B5/716

Abstract: Un support d'enregistrement magnétique comprend une base non magnétique (1) sur laquelle est disposée une couche non magnétisable ayant une structure en deux couches composée d'une première couche magnétisable (4) et d'une deuxième couche magnétisable (5) chacune à base de poudre magnétique d'oxyde de fer. Les deux couches magnétisables (4) et (5) peuvent réduire le bruit de polarisation tout en conservant la sortie de régénération à un niveau élevé sur toute la gamme en sélectionnant convenablement des zones spécifiques de la surface (mesurées par le procédé BET) de chaque poudre magnétique, la force coercitive, le flux magnétique résiduel et l'épaisseur de la couche.

Abstract translation: 一种磁记录介质，包括：非磁性基底（1），在所述非磁性基底上设置具有由第一可磁化层（4）和第二可磁化层（5）构成的双层结构的不可磁化层 磁性氧化铁粉末基地。 两个可磁化层（4）和（5）可通过适当选择每个表面的特定区域（通过BET方法测量）来减少偏置噪声，同时在整个范围内保持高水平的再生输出 磁粉，矫顽力，剩余磁通量和层厚度。

公开(公告)号：WO1993008564A1

公开(公告)日：1993-04-29

申请号：PCT/JP1992001376

申请日：1992-10-22

Applicant: HITACHI MAXELL, LTD. ,  UMEBAYASHI, Nobuhiro ,  MIYAKE, Akira ,  MIYATA, Teruhisa ,  KAI, Yoshikazu

Inventor： HITACHI MAXELL, LTD.

IPC: G11B05/70

CPC classification number: G11B5/825 ,  G11B5/5526 ,  G11B5/59677 ,  G11B5/706 ,  G11B5/708 ,  G11B5/71 ,  G11B5/74 ,  G11B5/855 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/261 ,  Y10T428/265

Abstract: In a magnetic recording medium wherein a light beam is projected onto a data track (14) between optical grooves (12) for tracking a magnetic head and the magnetic head is tracked according to the reflection beam produced by the projection, the tracking servo is properly performed by reducing the fluctuation of the reflection factor in the frequency region from 100 Hz to 2 kHz under 4 dB, and by presetting the thickness of a magnetic layer (10a) on the data track (14) or the depth of the grooves (23) within a specified range. The reliability of the magnetic recording medium is improved.

Abstract translation: 在磁光被投射到用于跟踪磁头的光学凹槽（12）之间的数据轨道（14）上并且根据由投影产生的反射光束跟踪磁头的磁记录介质中，跟踪伺服器是适当的 通过将频率范围内的反射系数的波动从100Hz减小到2kHz，在4dB下进行，并且通过预先设定数据轨道（14）上的磁性层（10a）的厚度或凹槽（23）的深度 ）在指定的范围内。 提高了磁记录介质的可靠性。

公开(公告)号：WO1986004719A1

公开(公告)日：1986-08-14

申请号：PCT/US1986000239

申请日：1986-02-04

Applicant: MEMOREX CORPORATION

Inventor： MEMOREX CORPORATION ,  JACKSON, Robert, A. ,  JOESTEN, Stephen, A. ,  IQBAL, Sikandar

IPC: G11B05/70

CPC classification number: G11B5/7013 ,  G11B5/7021

Abstract: Improved, tougher, more stable magnetic recording formulations of the water-based, thermosetting type; e.g., illustrating improved pigment dispersants and improved binder systems cross-linked via surface carboxyl groups.

Abstract translation: 水性，热固型的改进，更坚韧，更稳定的磁记录配方; 例如说明了通过表面羧基交联的改进的颜料分散剂和改进的粘合剂体系。

公开(公告)号：WO1984000241A1

公开(公告)日：1984-01-19

申请号：PCT/JP1983000211

申请日：1983-07-01

Applicant: SONY CORPORATION ,  CHUBACHI, Ryoji ,  NIHEI, Nobuyuki

Inventor： SONY CORPORATION

IPC: G11B05/70

CPC classification number: G11B5/702 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31609 ,  Y10T428/31786 ,  Y10T428/31935

Abstract: A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer mainly composed of needle-like magnetic powder and a binder, the magnetic powder being ferromagnetic metal powder having a coercive force of 1,000 Oe or more and a specific surface area of 45 m2/g (BET method) or more and the binder containing 50 wt % or more resin having high dispersibility due to the presence of at least one polar group selected from the group consisting of (I), (wherein M represents H, Li, Na or K, and M1 and M2 each represent H, Li, Na, K or an alkyl group) to attain excellent magnetic properties required for short-wave recording and improve durability.

Abstract translation: 磁记录介质包括其上沉积有主要由磁针形粉末和粘合剂组成的磁性层的非磁性载体，磁性粉末是具有相等矫顽力的铁磁金属粉末或 大于1000Oe且比表面积等于或大于45m2 / g（BET方法），并且粘合剂包含50重量％或更多的由于存在至少一种选择的极性基团而具有高分散特性的树脂 （I）（其中M表示H，Li，Na或K，并且M 1和M 2各自表示H，Li，Na，K或烷基），从而增加载体的持续时间并获得 短波记录所需的优异磁性。

公开(公告)号：WO1983001144A1

公开(公告)日：1983-03-31

申请号：PCT/JP1982000389

申请日：1982-09-27

Applicant: SONY CORPORATION ,  KUBOTA, Isao

Inventor： SONY CORPORATION

IPC: G11B05/70

CPC classification number: G11B5/716

Abstract: Support d'enregistrement magnétique comprenant une base non magnétique (1) pourvue d'une couche magnétisable ayant une structure en deux couches composée d'une première couche magnétisable (4) et d'une deuxième couche magnétisable (5) chacune à base d'une poudre magnétique d'oxyde de fer du type à dépôt d'un composé de Co ou à base d'une poudre magnétique d'oxyde de fer à dépôt de composés de Co et de Fe. Les deux couches magnétisables (4) et (5) peuvent réduire le bruit de polarisation tout en conservant le signal de sortie de régénération à un niveau élevé sur toute la gamme en sélectionnant convenablement des zones spécifiques de surface (mesurées par la méthode BET) de chaque poudre magnétique, la force coercitive, le flux magnétique résiduel et l'épaisseur de la couche.

公开(公告)号：WO1982000914A1

公开(公告)日：1982-03-18

申请号：PCT/JP1981000204

申请日：1981-08-28

Applicant: TOYO INK MFG CO LTD ,  TDK ELECTRONICS CO LTD ,  OHTSUKI A ,  TANAKA K ,  KONNO R ,  SHINOURA O ,  SUGAI M ,  KUBOTA Y ,  NISHIMATSU M

Inventor： TOYO INK MFG CO LTD ,  TDK ELECTRONICS CO LTD

IPC: G11B05/70

CPC classification number: G11B5/7013 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

Abstract: A magnetic recording medium with excellent electromagnetic characteristics, durability and mobility. The magnetic recording medium is produced by coating magnetic paint prepared by kneading magnetic powder with crosslinking or polymerizable resin binder together with phosphoric ester having polymerizable unsaturated double bond on a base and crosslinking or polymerizing the paint. Since the phosphoric ester is added as compared with the conventional dispersant, it improves the mechanical characteristics of the magnetic paint film and also improves the durability and the mobility of the magnetic recording medium.

Abstract translation: 具有优异电磁特性，耐久性和流动性的磁记录介质。 该磁记录介质通过将含有交联或可聚合树脂粘合剂的磁性粉末与具有可聚合不饱和双键的磷酸酯捏合在基底上并使涂料交联或聚合而制备的磁性涂料来制备。 由于与常规分散剂相比添加磷酸酯，因此改善了磁性漆膜的机械特性，并且还提高了磁记录介质的耐久性和迁移率。

公开(公告)号：WO1981002646A1

公开(公告)日：1981-09-17

申请号：PCT/JP1981000041

申请日：1981-03-02

Applicant: TDK ELECTRONICS CO LTD ,  TOYO INK MFG CO LTD ,  SUGAI M ,  OHTSUKI A ,  TANAKA K ,  KUBOTA Y ,  IMAOKA Y

Inventor： TDK ELECTRONICS CO LTD ,  TOYO INK MFG CO LTD

IPC: G11B05/70

CPC classification number: G11B5/7026 ,  C08G18/6212 ,  C08G18/671 ,  C08G18/8158 ,  G11B5/7022 ,  C08G18/62

Abstract: A magnetic recording medium useful for magnetic tape, magnetic cords, magnetic discs, etc., which is prepared by using (A) a radiation-hardenable compound having a molecular weight of not less than 5000, preferably not less than 8000, and having two or more unsaturated double bonds, (B) a radiation-hardenable compound having a molecular weight of not less than 400 and less than 5000, preferably 600 to 3000, and having one or more unsaturated double bonds, and (C) a radiation-hardenable compound having a molecular weight of less than 400 and having one or more unsaturated double bonds, coating a magnetic paint on a base material, the magnetic paint primarily containing magnetic particles prepared by compounding (A) and (B), or (A), (B) and (C), and a solvent, and, after preliminary drying, irradiating it.

公开(公告)号：EP0178685A3

公开(公告)日：1988-01-20

申请号：EP85113267

申请日：1985-10-18

Applicant: SONY CORPORATION

Inventor： Tanaka, Toshikazu c/o Sony Corporation ,  Nakamura, Etsuko c/o Sony Corporation ,  Katahira, Taku c/o Sony Corporation

IPC: G11B05/70 ,  G11B05/66 ,  H01F10/14

CPC classification number: G11B5/66

Abstract: @ A magnetic recording medium suitable for use in a single-pole type recording system utilizing a perpendicular magnetization mode, the medium including a nonmagnetic base, a low coercive force layer on the base, and a magnetic recording layer overlying the low coercive force layer. The magnetic recording layer has an easy axis of magnetization perpendicular to the nonmagnetic base. The nonmagnetic bass is composed of a material which is stable at a temperature of 220°C and higher. In accordance with the invention, the low coercive force layer is an iron-nickel alloy containing about 82 to 89.5 by weight nickel, the low coercive force layer resulting from vapor phase deposition of the alloy on the nonmagnetic base while the temperature of the base is at least 220°C.

公开(公告)号：EP0137949A3

公开(公告)日：1987-08-26

申请号：EP84109547

申请日：1984-08-10

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Ido, Tadashi c/o K.K. Toshiba ,  Kubo, Osamu c/o K.K. Toshiba ,  Fukasawa, Masahiro c/o K.K. Toshiba ,  Maeda, Tatsumi c/o K.K. Toshiba ,  Nomura, Tutomu c/o K.K. Toshiba

IPC: G11B05/714 ,  G11B05/70

CPC classification number: G11B5/714 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

Abstract: Disclosed is a magnetic recording medium formed of a substrate and a layer of magnetic powder coated on a surface of the substrate, characterized in that the magnetic powder is hexagonal crystals having single domain crystalline magnetic anisotropy, particle sizes of 0.01 to 0.3 µm, particle size/thickness ratios of 2.3 to 15 and the tapping packing rate of said magnetic powder is 15% or more.

Abstract translation: 本发明公开了一种磁性记录介质，其由基底和涂覆在基底表面上的磁性粉末层构成，其特征在于，所述磁性粉末是具有单畴晶体磁各向异性的六方晶体，粒径为0.01-0.3μm，粒径 /厚度比为2.3至15，并且所述磁粉的出料填充率为15％或更高。

公开(公告)号：EP0123081A3

公开(公告)日：1986-11-26

申请号：EP84102445

申请日：1984-03-07

Applicant: DeSOTO, INC.

Inventor： Ansel, Robert E.

IPC: G11B05/70

CPC classification number: G11B5/7026 ,  C08G18/672 ,  C08G18/8116 ,  G11B5/7021 ,  C08G18/48

Abstract: An electron beam-curable coating composition is disclosed in which magnetizable particles are dispersed in a liquid vehicle comprising at least one viscous nonpourable liquid to normally solid polyethylenically unsaturated compound having at least 2.5 repeating units held together by urethane linkages. The repeating units are polyether diol groups having a molecular weight in the range of 500 to 2500, and the polyethylenically unsaturated compound has an average of at least two ethylenically unsaturated groups per molecule and an average of one ethylenically unsaturated group per from 750 to 10,000 units of molecular weight. The compound is preferably used in a solution containing volatile organic solvent and a low molecular weight polyacrylate.

Abstract translation: 公开了一种电子束可固化涂料组合物，其中可磁化颗粒分散在液体载体中，其包含至少一种不粘稠液体至具有至少2.5个通过氨基甲酸酯键连接在一起的重复单元的通常为固体的多烯属不饱和化合物。 重复单元是分子量为500〜2500的聚醚二醇基，多烯属不饱和化合物每分子平均具有至少2个烯键式不饱和基团，平均每个烯属不饱和基团为750〜10000个 的分子量。 该化合物优选用于含有挥发性有机溶剂和低分子量聚丙烯酸酯的溶液中。