公开(公告)号：US20020018920A1

公开(公告)日：2002-02-14

申请号：US09862452

申请日：2001-05-23

Applicant: Hitachi, Ltd.

Inventor： Tomoo Yamamoto ,  Ichiro Tamai ,  Kiwamu Tanahashi ,  Akira Ishikawa

IPC: G11B005/73

CPC classification number: G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  G11B5/7379 ,  G11B2005/001

Abstract: A magnetic recording apparatus of a large capacity capable of super-high density recording of 10 Gbits or more per one square inch has a magnetic recording medium prepared by forming a Co alloy magnetic layer by way of an underlayer comprising Co or Cr alloy on a substrate, in which an amorphous or micro crystal seed layer containing at least Ti and Al is disposed between the substrate and the underlayer, the magnetic layer has an h.c.p. structure and is grown to (1.1.0) direction parallel with the substrate, the magnetic recording medium of high coercivity and reduced noises and undergoing less effects of thermal fluctuation being provided because of in-plane orientation of the axis of easy magnetization of the magnetic layer and the reduced size of the magnetic crystal grains and dispersion thereof, combination of the magnetic recording medium and the magnetic head having a read only device utilizing the magnetoresistive effect capable of providing a magnetic recording apparatus having a recording density at 10 Gbits or more per one square inch.

Abstract translation: 具有能够每平方英寸高10Gb或更高的超高密度记录的大容量的磁记录装置具有磁记录介质，该磁记录介质是通过在衬底上形成包含Co或Cr合金的底层的Co合金磁性层而制备的 其中至少含有Ti和Al的非晶或微晶晶种子层设置在基底和底层之间，磁性层具有hcp 结构，并且与基板平行生长（1.1.0）方向，由于磁性容易磁化的轴的面内定向，因此提供了高矫顽力和降低的噪声并且发生较少的热波动效应的磁记录介质 磁性晶粒和其分散体的尺寸减小，磁记录介质和具有只读器件的磁头的组合利用磁阻效应，能够提供具有10Gb或更高记录密度的磁记录装置 一平方英寸

公开(公告)号：US20020064688A1

公开(公告)日：2002-05-30

申请号：US09938273

申请日：2001-08-23

Inventor： Yoshinobu Sugata

IPC: G11B005/73

CPC classification number: G11B5/8404

Abstract: A recording medium manufacturing method has a surface treatment process which removes contamination from a surface of a thermoplastic resin support substrate and also improves its wettability. This surface treatment process is conducted prior to forming the layer structure, which includes at least a signal recording layer, onto the surface of the thermoplastic resin support substance. The support substance is placed in an active gas atmosphere, such as ozone, followed by an inert gas atmosphere, such as nitrogen. This surface treatment process generates little deterioration in the support substrate surface.

Abstract translation: 记录介质的制造方法具有从热塑性树脂支撑基板的表面除去污染的表面处理工艺，并且还提高其润湿性。 在将热塑性树脂支撑物质的表面上形成至少包含信号记录层的层结构之前进行该表面处理工艺。 将载体物质置于诸如臭氧的活性气体气氛中，然后置于诸如氮气的惰性气体气氛中。 该表面处理工艺在支撑基材表面几乎没有劣化。

公开(公告)号：US20020114977A1

公开(公告)日：2002-08-22

申请号：US10002126

申请日：2001-12-05

Inventor： Akira Kubota ,  Kenichi Eto ,  Yukari Nakamori ,  Tetsuya Tsunekawa

IPC: G11B005/73

CPC classification number: G11B5/733 ,  B32B27/36 ,  C08J5/18 ,  C08J2367/02 ,  C08J2379/08 ,  C08L67/02 ,  C08L79/08 ,  C08L81/06 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/31721 ,  Y10T428/31725 ,  Y10T428/31786 ,  C08L2666/14

Abstract: The present invention provides a polyester film, which is composed of a polyester resin and a polyimide resin, having superior oligomer-restraining property and dimensional stability. This polyester film also has improved surface conditions, that is, has a reduced number of projections on the surface, and hence, the polyester film shows superior electromagnetic conversion characteristics when used for magnetic recording media. In particular, this polyester film is effectively used for high-density magnetic recording media. This film is composed of a polyester resin and a thermoplastic resin other than a polyester resin, and has a number H1 of coarse projections 0.28 nullm or more in height of 0 to 100/100 cm2 on at least one surface of the polyester film and a number H2 of coarse projections 0.56 nullm or more in height of 0 to 10/100 cm2 on the same surface.

Abstract translation: 本发明提供由聚酯树脂和聚酰亚胺树脂构成的聚酯膜，具有优异的低聚物抑制性和尺寸稳定性。 该聚酯膜也具有改善的表面条件，即表面上的突起数量减少，因此当用于磁记录介质时，聚酯膜具有优异的电磁转换特性。 特别地，该聚酯膜有效地用于高密度磁记录介质。 该薄膜由聚酯树脂和聚酯树脂以外的热塑性树脂构成，在聚酯薄膜的至少一个表面上具有0〜100 / 100cm 2的高度为0.28μm以上的粗突起数H1， 在相同的表面上的粗突起的数量为H 2的高度为0至10 / 100cm 2的0.56μm或更大。

公开(公告)号：US20020164505A1

公开(公告)日：2002-11-07

申请号：US09969625

申请日：2001-10-04

Applicant: HOYA CORPORATION

Inventor： Tomotaka Yokoyama ,  Takemi Miyamoto ,  Hiroshi Tomiyasu ,  Kouji Takahashi

IPC: G11B005/73

CPC classification number: G11B5/7315 ,  G11B5/74 ,  G11B5/82 ,  Y10S428/90

Abstract: A substrate for an information recording medium, wherein the period of microwaviness is 2 nullm to 4 mm, and if we let wa be the maximum height of this microwaviness and Rmax be the maximum height measured by atomic force microscope, the main surface of the substrate has a wa of no more than 5 nm and an Rmax of no more than 12 nm, provided that wa is the difference between the highest and lowest points on a measurement curve of all measured points in a measurement area.

Abstract translation: 一种用于信息记录介质的基板，其中微波的周期为2μm至4mm，并且如果将该微波的最大高度设为wa，并且Rmax为通过原子力显微镜测量的最大高度，则基板的主表面 具有不大于5nm的wa和不大于12nm的Rmax，条件是wa是测量区域中所有测量点的测量曲线上的最高点和最低点之间的差。

公开(公告)号：US20020150792A1

公开(公告)日：2002-10-17

申请号：US09917442

申请日：2001-07-27

Inventor： William Blake Kolb ,  Gary L. Huelsman

IPC: G11B005/73

CPC classification number: G11B5/70 ,  G11B5/842 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/266

Abstract: A method is provided for coating one or more fluid layers on a substrate to form magnetic recording media such as magnetic tape and diskettes. The method takes advantage of fluid coating formulations having a particular rheology that enables the coating of one or more magnetic layers with reduced thicknesses while achieving increased coating speeds. With proper rheology, one or more layers can be coated on a substrate traveling at increased speeds while maintaining desired coating thicknesses.

公开(公告)号：US20020034664A1

公开(公告)日：2002-03-21

申请号：US09912449

申请日：2001-07-25

Inventor： Youich Tei ,  Syoji Sakaguchi ,  Katsunori Suzuki

IPC: G11B005/73

CPC classification number: G11B5/8404 ,  F26B5/04 ,  F26B21/10 ,  F26B21/14 ,  G11B5/73 ,  G11B5/7315

Abstract: The gas components in thermoplastic norbomene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.

Abstract translation: 热塑性降冰片树脂颗粒中的气体组分通过在真空下或在常压和真空下干燥树脂而被抑制在一定水平以下。 通过注射成型树脂，通过根据本发明的方法干燥的树脂来制造用于磁记录介质的基材。 使用根据本发明制造的基板的磁记录介质至少包括磁性层，磁性层上的保护层和保护层上的液体润滑剂层。 通过在本发明的基板上依次形成这些层来制造磁记录介质。

公开(公告)号：US20010051286A1

公开(公告)日：2001-12-13

申请号：US09885494

申请日：2001-06-20

Inventor： Shigeto Oiri ,  Yoji Tsukamoto ,  Hideaki Yasui

IPC: G11B005/73

CPC classification number: G11B5/73

Abstract: A magnetic recording medium comprising a nonmagnetic substrate, a liquid lubricant-containing coating layer having a porosity (U) formed on the substrate, and a magnetic layer having a porosity (M) formed directly on the coating layer. The ratio of porosity (U/M) between the coating and magnetic layers is between 0.75 and 1.25. The volume percentage of the lubricant contained in the pores of the coating layer based on the whole pore volume in the coating layer is from 35 to 85%. This improves the durability of the magnetic layer.

公开(公告)号：US20020172841A1

公开(公告)日：2002-11-21

申请号：US10108380

申请日：2002-03-29

Inventor： Hitoshi Hirayama ,  Masao Nakayama

IPC: G11B005/73

CPC classification number: G11B5/7325 ,  Y10T428/31681 ,  Y10T428/31725

Abstract: A magnetic recording medium comprises a non-magnetic substrate and a metal thin film magnetic layer formed by an oblique evaporating method on the substrate, the non-magnetic substrate being an aromatic polyamide film. The film has a thickness of 3.0 nullm to 6.0 nullm, has a Young's modulus in the transverse direction of 16000 MPa to 18000 MPa, and has a thermal contraction coefficient (in the transverse direction; 180null C. for 30 minutes) of 0.7% to 1.3%. With this structure, it has been found that the thermal deformation (cupping) after the thin film is formed can be prevented to improve head touch and the electromagnetic conversion properties.

Abstract translation: 磁记录介质包括非磁性基板和通过倾斜蒸发法在基板上形成的金属薄膜磁性层，非磁性基板是芳香族聚酰胺薄膜。 膜的厚度为3.0〜6.0μm，横向的杨氏模量为16000MPa〜18000MPa，热收缩系数（横向为180℃，30分钟）为0.7％ 至1.3％。 利用这种结构，已经发现可以防止形成薄膜之后的热变形（拔罐）来改善头部接触和电磁转换性能。

公开(公告)号：US20010033948A1

公开(公告)日：2001-10-25

申请号：US09811280

申请日：2001-03-16

Inventor： Ursula Murschall ,  Andreas Stopp ,  Guenther Crass ,  Harald Mueller

IPC: G11B005/73

CPC classification number: C08J5/18 ,  B32B27/36 ,  C08J2367/02 ,  G11B5/73 ,  G11B5/733 ,  G11B5/8404 ,  Y10T428/265 ,  Y10T428/31 ,  Y10T428/31786

Abstract: The present invention relates to an at least single-layer, biaxially oriented film support for magnetic recording media which is predominantly composed of crystallizable polyester, having a thickness in the range from 1 to 40 nullm. The film has, over its total roll length and roll width and after it has been made up into customer rolls, an electrostatic charge build-up which is in the range from null80 kV/m to null80 kV/m, the contact pressure at the roll cutters during make-up being set in the range from 300 N/m to 350 N/m. The film is drawn between electrical discharge means, which are arranged close to the roll, along the film path in the make-up machine, and is particularly suitable for high-quality audio, video or computer tapes and for floppy disks or thermal tapes.

Abstract translation: 本发明涉及一种用于磁记录介质的至少单层双轴取向薄膜载体，其主要由可结晶的聚酯组成，其厚度在1至40μm的范围内。 该膜在其总辊长度和辊宽之上，并且在其被制成顾客辊之后，静电电荷积聚在-80kV / m到+ 80kV / m的范围内，接触压力 在化妆时的轧辊切割机设定在300N / m到350N / m的范围内。 胶片沿着构成机器中的胶片路径被放置在靠近卷筒的放电装置之间，并且特别适用于高质量的音频，视频或计算机磁带以及软盘或热带。

公开(公告)号：US20010021466A1

公开(公告)日：2001-09-13

申请号：US09779746

申请日：2001-02-09

Inventor： Shinya Maenosono

IPC: G11B005/73

CPC classification number: G11B5/8404

Abstract: A support for a flexible magnetic recording medium made of a polyimide film obtained by coating a solution of a solvent-soluble polyimide resin on a solid substrate having a smooth surface, removing the solvent, and then peeling apart a coated film from the substrate. The support has high heat resistance and has a smooth surface, and a magnetic recording layer having high surface smoothness can be effectively formed thereon by a vacuum film-forming method such as sputtering.

Abstract translation: 由通过将溶剂可溶性聚酰亚胺树脂溶液涂布在具有光滑表面的固体基质上，除去溶剂，然后从基材上剥离涂膜而获得的由聚酰亚胺膜制成的柔性磁记录介质的支持。 该支撑体具有高耐热性并且具有光滑的表面，并且可以通过诸如溅射的真空成膜方法在其上有效地形成具有高表面平滑度的磁记录层。