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1. 发明申请

US20100081013A1 MAGNETIC DISK SUBSTRATE AND MAGNETIC DISK 审中-公开
标题翻译：磁盘基片和磁盘
公开(公告)号：US20100081013A1
公开(公告)日：2010-04-01
申请号：US12566288
申请日：2009-09-24
申请人： Kenichi NISHIMORI , Tadashi TOMONAGA
发明人： Kenichi NISHIMORI , Tadashi TOMONAGA
IPC分类号： G11B5/706
CPC分类号： G11B5/7315 , G11B5/82
摘要： In a magnetic disk substrate being annular and having a first and a second main surface, (1) surface roughness measured by an atomic force microscope having a resolution of 256×256 pixels per 2 μm square and/or (2) the number of foreign substances detected to have sizes of 0.1 μm or more and 1.0 μm or less upon detection of scattered light from the magnetic disk substrate when laser light with a wavelength of 405 nm is irradiated with a spot size of 5 μm at a laser power of 25 mW differ/differs between the first and the second main surfaces. Only the first main surface has a surface quality usable as a magnetic recording surface. The number of the foreign substances detected to have the sizes of 0.1 μm or more and 1.0 μm or less upon detection of the scattered light from the magnetic disk substrate when the laser light with the wavelength of 405 nm is irradiated with the spot size of 5 μm at the laser power of 25 mW is 400 or less per 30 cm2 on the second main surface.
摘要翻译：在环形且具有第一和第二主表面的磁盘基片中，（1）由原子力显微镜测得的表面粗糙度分辨率为每平方米256×256像素和/或（2）外来数量在激光功率为25mW的情况下用波长为405nm的激光照射5μm的激光时，检测出具有0.1μm以上且1.0μm以下的尺寸的物质，当检测到来自磁盘基板的散射光时，在第一和第二主表面之间不同/不同。只有第一主表面具有可用作磁记录表面的表面质量。当检测到波长为405nm的激光的光斑尺寸为5时，检测到来自磁盘基板的散射光的检测到的尺寸为0.1μm以上且1.0μm以下的异物的数量在25mW的激光功率下的μm在第二主表面上的每30cm 2是400或更小。

2. 发明申请

US20120276416A1 MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND MAGNETIC DISK DEVICE 审中-公开
标题翻译：磁盘基板，磁盘和磁盘装置
公开(公告)号：US20120276416A1
公开(公告)日：2012-11-01
申请号：US13544212
申请日：2012-07-09
申请人： Toshio TAKIZAWA , Kraisorn PHANDON , Kenichi NISHIMORI
发明人： Toshio TAKIZAWA , Kraisorn PHANDON , Kenichi NISHIMORI
IPC分类号： G11B5/706
CPC分类号： G11B5/7315 , G11B5/82
摘要： It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate.The representative structure of a magnetic disk substrate according to this invention is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.
摘要翻译：本发明的目的是提供一种高可靠性的磁盘基板，即使磁盘高速旋转也能够防止发生碰撞故障，适用于通过负载/卸载方法启动和停止的硬盘使用这种基板的盘。根据本发明的磁盘基板的代表性结构是具有大致平坦的主表面11，端面12，形成在主表面11和端面12之间的倒角面13的圆盘形玻璃基板10，以及在主表面11的周边处，偏移部分相对于主表面11的外周面的平坦表面升高或降低，并且其特征在于，偏移部分的大小整体上大致均匀玻璃基板10的周长。

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