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    Magnetic recording medium
    1.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US06936328B2

    公开(公告)日：2005-08-30

    申请号：US10395275

    申请日：2003-03-25

    Applicant: Satoru Hayakawa ,  Yuichiro Murayama

    Inventor： Satoru Hayakawa ,  Yuichiro Murayama

    IPC: G11B5/70 ,  G11B5/702 ,  G11B5/738 ,  G11B5/733

    CPC classification number: G11B5/738 ,  G11B5/70 ,  G11B5/7026 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/2982

    Abstract: A magnetic recording medium comprising: a support; a subbing layer comprising a radiation-curable resin; a nonmagnetic layer comprising a nonmagnetic powder and a binder; and at least one magnetic layer comprising a ferromagnetic powder and a binder, in this order, wherein the subbing layer has a thickness of from 0.05 to 1.0 μm, and the nonmagnetic powder has an average acicular ratio of 8 or more and has a form of a raft.

    Abstract translation: 一种磁记录介质，包括：支撑体; 包含辐射固化树脂的底层; 包含非磁性粉末和粘合剂的非磁性层; 以及包含铁磁粉末和粘合剂的至少一个磁性层，其中所述底层具有0.05至1.0μm的厚度，并且所述非磁性粉末的平均针状比为8或更大，并且具有 筏子

    Magnetic recording disc comprising a non-magnetic underlayer and a magnetic layer comprising ferromagnetic particles and a binder
    7.
    发明授权
    Magnetic recording disc comprising a non-magnetic underlayer and a magnetic layer comprising ferromagnetic particles and a binder 失效
    磁记录盘包括非磁性底层和包含铁磁颗粒和粘合剂的磁性层

    公开(公告)号：US5384175A

    公开(公告)日：1995-01-24

    申请号：US959795

    申请日：1992-10-13

    Applicant: Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

    Inventor： Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

    IPC: G11B5/706 ,  G11B5/738 ,  G11B23/00

    CPC classification number: G11B5/70605 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/30

    Abstract: A novel magnetic recording disc is provided comprising, a nonmagnetic support having thereon a nonmagnetic layer comprising nonmagnetic particles and a binder resin, and a magnetic layer comprising ferromagnetic particles and a binder resin, in this order. The nonmagnetic particles in the nonmagnetic layer are partially or entirely electrically conductive particles, the thickness of the magnetic layer is in the range of 0.5 .mu.m or less, and the orientation ratio of the ferromagnetic particles in the magnetic layer is 0.85 or more.A novel process for preparing the magnetic recording disc is provided. Further, a novel process for recording and reproduction of a signal having a shortest recordable wavelength of 1.5 .mu.m or less is provided, which utilizes the magnetic recording disc in conjunction with a magnetic head having a gap length (.delta.) of 0.50 .mu.m or less.

    Abstract translation: 提供了一种新颖的磁记录盘，其包括：非磁性载体，其上具有包含非磁性颗粒和粘合剂树脂的非磁性层，以及包含铁磁颗粒和粘合剂树脂的磁性层。 非磁性层中的非磁性颗粒是部分或全部是导电颗粒，磁性层的厚度在0.5μm或更小的范围内，并且磁性层中铁磁性颗粒的取向比为0.85以上。 提供了一种制备磁记录盘的新颖方法。 另外，提供了一种用于记录和再现具有最小可记录波长为1.5μm或更小的信号的新颖方法，其利用磁记录盘与间隙长度（delta）为0.50μm的磁头或 减。

    Magnetic recording medium comprising an underlayer of non magnetic powder and binder resin and a magnetic layer with a specified Young's modulus
    8.
    发明授权
    Magnetic recording medium comprising an underlayer of non magnetic powder and binder resin and a magnetic layer with a specified Young's modulus 失效
    磁记录介质包括非磁性粉末和粘合剂树脂的底层和具有特定杨氏模量的磁性层

    公开(公告)号：US5358777A

    公开(公告)日：1994-10-25

    申请号：US19257

    申请日：1993-02-18

    Applicant: Masaya Kojima ,  Satoru Hayakawa ,  Toshio Kawamata

    Inventor： Masaya Kojima ,  Satoru Hayakawa ,  Toshio Kawamata

    IPC: G11B5/82 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/73 ,  G11B5/733 ,  G11B5/738 ,  G11B5/842 ,  G11B5/00

    CPC classification number: G11B5/738 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

    Abstract: A magnetic recording medium comprising (A) a non-magnetic support; (B) a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin; and (C) a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein said non-magnetic layer is coated on said non-magnetic support; and said magnetic layer is coated over the previously formed non-magnetic layer while the previously formed non-magnetic layer is still wet; the thickness of the magnetic layer is 0.6 .mu.m or less; the Young's Modulus of the magnetic layer is from 50% to 95% of the Young's Modulus of the non-magnetic layer, and the glass transition temperature of the magnetic layer is lower than that of the non-magnetic layer. The magnetic recording medium has good electromagnetic characteristics and excellent running stability and running durability. It is suitable as a disc medium for high-density recording at a shortest recording wavelength of 1.5 .mu.m or less, displaying excellent overwriting characteristic in high-density recording. The running reliability of the magnetic recording medium is good.

    Abstract translation: 一种磁记录介质，包括（A）非磁性载体; （B）主要包含非磁性粉末和粘合剂树脂的非磁性层; 和（C）主要包含铁磁性粉末和粘合剂树脂的磁性层，其中所述非磁性层涂覆在所述非磁性载体上; 并且所述磁性层涂覆在先前形成的非磁性层上，同时先前形成的非磁性层仍然是湿的; 磁性层的厚度为0.6μm以下; 磁性层的杨氏模量是非磁性层的杨氏模量的50％至95％，并且磁性层的玻璃化转变温度低于非磁性层的玻璃化转变温度。 磁记录介质具有良好的电磁特性和良好的运行稳定性和运行耐久性。 适合于在1.5μm以下的最短记录波长下进行高密度记录的盘式介质，在高密度记录中显示优异的重写特性。 磁记录介质的运行可靠性好。

    Leader tape and magnetic tape cartridge using the same
    9.
    发明申请
    Leader tape and magnetic tape cartridge using the same 有权
    领带和磁带使用相同

    公开(公告)号：US20050214595A1

    公开(公告)日：2005-09-29

    申请号：US11091401

    申请日：2005-03-29

    Applicant: Satoru Hayakawa

    Inventor： Satoru Hayakawa

    IPC: G11B5/627 ,  B32B1/00 ,  G11B5/70 ,  G11B23/02 ,  G11B23/037 ,  G11B23/107 ,  G11B23/26

    CPC classification number: G11B23/037 ,  G11B23/107 ,  G11B23/26 ,  Y10T428/31

    Abstract: A leader tape comprising a support and a coating layer containing powder and a binder, wherein at least one surface of the leader tape has a center line average surface roughness (Ra) of from 10 to 60 nm, and depression hardness (DH) defined by the following equation (1) of from 60 to 140 kg/mm2 (0.588 to 1.372 GPa): DH=3.7926×10−2[Pmax/(Hmax)2](kg/mm2)  (1) wherein Pmax is a maximum load and Hmax is a maximum displacement amount of an indenter.

    Abstract translation: 一种引导带，其包括载体和包含粉末和粘合剂的涂层，其中引带的至少一个表面具有10至60nm的中心线平均表面粗糙度（Ra），以及由10至60nm定义的凹陷硬度（DH） 下列公式（1）为60至140kg / mm 2（0.588至1.372GPa）：<？在线公式描述=“在线公式”end =“lead”？ > DH = 3.7926×10 -2 [Pmax /（Hmax）2]（kg / mm 2）（1）<？ -formulae description =“In-line Formulas”end =“tail”？>其中Pmax是最大载荷，Hmax是压头的最大位移量。

    Magnetic recording tape favorably employable for computer data storage
    10.
    发明授权
    Magnetic recording tape favorably employable for computer data storage 失效
    适用于计算机数据存储的磁记录磁带

    公开(公告)号：US5958565A

    公开(公告)日：1999-09-28

    申请号：US848596

    申请日：1997-04-28

    Applicant: Yasushi Hattori ,  Akira Kasuga ,  Toshio Kawamata ,  Tatsuo Ishikawa ,  Satoru Hayakawa

    Inventor： Yasushi Hattori ,  Akira Kasuga ,  Toshio Kawamata ,  Tatsuo Ishikawa ,  Satoru Hayakawa

    IPC: G11B5/70 ,  G11B5/73 ,  G11B5/733 ,  G11B5/735

    CPC classification number: G11B5/7305 ,  G11B5/70 ,  G11B5/733 ,  G11B5/735 ,  Y10S428/90 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/258 ,  Y10T428/265

    Abstract: A magnetic recording tape favorably employable for computer data storage has a flexible polymer web, a magnetic recording layer arranged on one surface side of the web, and a backing layer arranged on another surface side of the web, characterized in that the recording tape has a thickness of 2 to 8 .mu.m and shows a Young's modulus of not less than 1,200 kg/mm.sup.2 in its longitudinal direction; and the backing layer has a thickness of 0.2 to 1 .mu.m and is composed of a binder, a carbon black, a non-magnetic powder I having Mohs' scale of hardness of 3 to 4.5 and another non-magnetic powder II having Mohs' scale of hardness of 5 to 9. Between the magnetic layer and the flexible polymer web, a non-magnetic undercoating layer composed of a binder and a non-magnetic powder can be provided.

    Abstract translation: 有利地用于计算机数据存储的磁记录带具有柔性聚合物网，布置在网的一个表面侧的磁记录层和布置在网的另一表面侧上的背衬层，其特征在于记录带具有 厚度为2〜8μm，纵向杨氏模量为1200kg / mm2以上。 背衬层的厚度为0.2〜1μm，由粘合剂，炭黑，莫氏硬度为3〜4.5的非磁性粉末I和具有Mohs' 在硬磁性层和柔性聚合物网之间，可以提供由粘合剂和非磁性粉末组成的非磁性底涂层。

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