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1. 发明授权

US08734967B2 Substrate for magnetic disk and magnetic disk 有权
标题翻译：基板用于磁盘和磁盘
公开(公告)号：US08734967B2
公开(公告)日：2014-05-27
申请号：US13001984
申请日：2009-06-29
申请人： Kouji Kitsunai , Hiroshi Takeda , Yukari Senda
发明人： Kouji Kitsunai , Hiroshi Takeda , Yukari Senda
IPC分类号： G11B5/71 , G11B5/706 , G11B15/12
CPC分类号： G11B5/7315 , C03C3/083 , G11B5/82 , G11B20/1816 , G11B2220/2516 , Y10T428/21
摘要： The shape and number of surface defects are controlled so that the occurrence of failure is suppressed in an HDD device in which a magnetic head with a very small flying height, such as a DFH head, is mounted.A magnetic disk substrate is characterized in that when laser light with a wavelength of 405 nm and a laser power of 25 mW is irradiated with a spot size of 5 μm and scattered light from the substrate is detected, the number of defects detected to have a size of 0.1 μm to not more than 0.3 μm is less than 50 per 24 cm2 and, with respect to the defects, there is no defect in which, in a bearing curve obtained by a bearing curve plot method using an atomic force microscope, a portion from an apex of the defect to 45% thereof is located in an area of defect height higher than a virtual line connecting from the apex of the defect to 45% thereof.
摘要翻译：控制表面缺陷的形状和数量，使得在安装有诸如DFH头的飞行高度非常小的磁头的HDD装置中，可以抑制故障的发生。磁盘基板的特征在于，当以5μm的点尺寸照射波长为405nm，激光功率为25mW的激光，并检测到来自基板的散射光时，检测出具有 0.1μm〜0.3μm的尺寸小于每24cm 2的50个，对于缺陷，没有缺陷，在通过使用原子力显微镜的轴承曲线绘图法得到的轴承曲线中，从缺陷的顶点到其45％的部分位于高于从缺陷的顶点连接到其缺陷的虚拟线的缺陷高度的45％的区域中。

2. 发明申请

US20110109994A1 SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK 有权
标题翻译：磁盘和磁盘基板
公开(公告)号：US20110109994A1
公开(公告)日：2011-05-12
申请号：US13001984
申请日：2009-06-29
申请人： Kouji Kitsunai , Hiroshi Takeda , Yukari Senda
发明人： Kouji Kitsunai , Hiroshi Takeda , Yukari Senda
IPC分类号： G11B5/82 , G11B5/706
CPC分类号： G11B5/7315 , C03C3/083 , G11B5/82 , G11B20/1816 , G11B2220/2516 , Y10T428/21
摘要： The shape and number of surface defects are controlled so that the occurrence of failure is suppressed in an HDD device in which a magnetic head with a very small flying height, such as a DFH head, is mounted.A magnetic disk substrate is characterized in that when laser light with a wavelength of 405 nm and a laser power of 25 mW is irradiated with a spot size of 5 μm and scattered light from the substrate is detected, the number of defects detected to have a size of 0.1 μm to not more than 0.3 μm is less than 50 per 24 cm2 and, with respect to the defects, there is no defect in which, in a bearing curve obtained by a bearing curve plot method using an atomic force microscope, a portion from an apex of the defect to 45% thereof is located in an area of defect height higher than a virtual line connecting from the apex of the defect to 45% thereof.
摘要翻译：控制表面缺陷的形状和数量，使得在安装有诸如DFH头的飞行高度非常小的磁头的HDD装置中，可以抑制故障的发生。磁盘基板的特征在于，当以5μm的点尺寸照射波长为405nm，激光功率为25mW的激光，并检测到来自基板的散射光时，检测出具有 0.1μm〜0.3μm的尺寸小于每24cm 2的50个，对于缺陷，没有缺陷，在通过使用原子力显微镜的轴承曲线绘图法得到的轴承曲线中，从缺陷的顶点到其45％的部分位于高于从缺陷的顶点连接到其缺陷的虚拟线的缺陷高度的45％的区域中。

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