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1. 发明公开

EP0735525A2 Magnetic recording medium 失效
标题翻译： MagnetischerAufzeichnungsträger
公开(公告)号：EP0735525A2
公开(公告)日：1996-10-02
申请号：EP96104957.4
申请日：1996-03-28
申请人： TDK Corporation
发明人： Yoshimura, Youichi , Watase, Shigeharu
IPC分类号： G11B5/72 , G11B5/712 , G11B5/706 , G11B5/68
CPC分类号： G11B5/84 , G11B5/68 , G11B5/708 , G11B5/7085 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/265
摘要： A magnetic recording medium includes a flexible substrate (10), a coating layer (20) formed on the flexible substrate (10), and a magnetic layer(30) formed on the coating layer(20). The coating layer(20) contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7µm as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer(30) contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 µm. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 µm. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 µm and satisfies conditions defined by the following equations (1) and (2): equation(1) d mx ≦(d av × 2.0) + 0.5 equation(2) d mx ≦ t c + t m + 0.5 wherein d mx represents a maximum particle size of the abrasive, d av represents an average particle size of the abrasive, t c represents a thickness of the coating layer, and t m represents a thickness of the magnetic layer. With this arrangement, the magnetic recording medium is excellent in productivity and further improves a surface property of the thin magnetic layer. This achieves high outputs at a region of shorter wavelength and further achieves excellent running durability.
摘要翻译：磁记录介质包括柔性基板（10），形成在柔性基板（10）上的涂层（20）和形成在涂层（20）上的磁性层（30）。涂层（20）含有粘合剂和非磁性粒子，其厚度在0.05〜0.7μm的范围内，作为在柔性基材上涂布涂层后至少进行一次拉伸处理的结果。磁性层（30）含有磁性粉末，粘合剂和磨料，其厚度为0.05〜1.0μm。包含在涂层中的非磁性粒子的平均粒径在0.01〜0.08μm的范围内。包含在磁性层中的磨料具有在0.05至0.8μm范围内的平均粒度，并且满足由以下等式（1）和（2）定义的条件：其中dmx表示研磨剂的最大粒度dav表示研磨剂的平均粒径，tc表示涂层的厚度，tm表示磁性层的厚度。通过这种布置，磁记录介质的生产率优异，并进一步提高了薄磁性层的表面性能。这实现了在较短波长区域的高输出，并且进一步实现了良好的运行耐久性。

2. 发明公开

EP0735525A3 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：EP0735525A3
公开(公告)日：1998-02-11
申请号：EP96104957.4
申请日：1996-03-28
申请人： TDK Corporation
发明人： Yoshimura, Youichi , Watase, Shigeharu
IPC分类号： G11B5/72 , G11B5/712 , G11B5/706 , G11B5/68
CPC分类号： G11B5/84 , G11B5/68 , G11B5/708 , G11B5/7085 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/265
摘要： A magnetic recording medium includes a flexible substrate (10), a coating layer (20) formed on the flexible substrate (10), and a magnetic layer(30) formed on the coating layer(20). The coating layer(20) contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7µm as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer(30) contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 µm. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 µm. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 µm and satisfies conditions defined by the following equations (1) and (2): equation(1) d mx ≦(d av × 2.0) + 0.5 equation(2) d mx ≦ t c + t m + 0.5 wherein d mx represents a maximum particle size of the abrasive, d av represents an average particle size of the abrasive, t c represents a thickness of the coating layer, and t m represents a thickness of the magnetic layer. With this arrangement, the magnetic recording medium is excellent in productivity and further improves a surface property of the thin magnetic layer. This achieves high outputs at a region of shorter wavelength and further achieves excellent running durability.
摘要翻译：磁记录介质包括柔性基板（10），形成在柔性基板（10）上的涂层（20）以及形成在涂层（20）上的磁性层（30）。涂层（20）含有粘合剂和非磁性颗粒，并且由于在柔性基板上涂覆涂层之后进行至少一次拉伸处理，所以涂层的厚度在0.05至0.7μm的范围内。磁性层（30）含有磁性粉末，粘合剂和研磨材料，厚度为0.05〜1.0μm。包含在涂层中的非磁性颗粒具有0.01至0.08μm范围内的平均粒径。包含在磁性层中的磨料具有0.05至0.8μm范围内的平均粒径，并且满足由以下方程（1）和（2）定义的条件：方程（1）dmx≤（dav×2.0）+0.5方程（2）dmx≤tc+ tm + 0.5其中dmx表示研磨剂的最大粒径，dav表示研磨剂的平均粒径，tc表示涂层的厚度，并且tm表示磁性层的厚度。由此，磁记录介质的生产率优异，并且能够进一步提高薄磁性层的表面性。这在较短波长的区域实现高输出，并且进一步实现优异的运行耐久性。

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