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公开(公告)号：US20180047421A1
公开(公告)日：2018-02-15
申请号：US15790273
申请日：2017-10-23
发明人： Koji Adachi , Ian J. Beresford , Thomas Y. Chang , Kuo Hsing Hwang , James Hennessy , David Perez
CPC分类号： G11B5/82 , G11B5/39 , G11B5/4813 , G11B5/5526 , G11B5/7315 , G11B19/2009 , G11B19/28 , G11B20/1217 , G11B33/02 , G11B33/027 , G11B2020/1238
摘要： Apparatus and method for magnetic recording media. A rotatable magnetic recording disc has an outermost annular sidewall that extends at nominally 97 millimeters, mm for a 3½ inch form factor data storage device or at nominally 67 mm for a 2½ inch form factor data storage device. The rotatable magnetic recording disc further has a disc shaped substrate of metal or glass, and a magnetic recording layer supported by the disc shaped substrate and configured to magnetically record data along concentric tracks.
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公开(公告)号：US09865293B2
公开(公告)日：2018-01-09
申请号：US15603964
申请日：2017-05-24
申请人： HOYA CORPORATION
发明人： Takashi Maeda , Takumi Kuhara
CPC分类号： G11B5/73 , G11B5/7315 , G11B5/82
摘要： When waviness having a wavelength component of 10 to 500 μm in the circumferential direction of a main surface of a disk-shaped substrate is acquired and slopes are acquired from the waviness at an interval of 50 to 100 μm, the substrate being used in a magnetic disk on which recording or reading is performed using a DFH head, an average value of absolute values of the slopes is 0.45×10−4 or less. This magnetic-disk substrate is used in a magnetic disk and a magnetic-disk drive device.
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公开(公告)号：US20170327930A1
公开(公告)日：2017-11-16
申请号：US15522921
申请日：2015-10-30
发明人： Kotaro Kitawaki , Akira Hibino , Wataru Kumagai , Mitsuo Masuda , Sadayuki Toda
CPC分类号： C22C21/02 , C22C21/00 , C22C21/06 , C22F1/04 , C22F1/043 , G11B5/73 , G11B5/7315 , G11B5/733
摘要： An aluminum alloy substrate for a magnetic disk includes 0.5 mass % or more and 24.0 mass % or less of Si, 0.01 mass % or more and 3.00 mass % or less of Fe, and the balance of Al and unavoidable impurities. The aluminum alloy substrate for a magnetic disk includes a smooth plated surface and has high rigidity.
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公开(公告)号：US20170169848A1
公开(公告)日：2017-06-15
申请号：US15441931
申请日：2017-02-24
申请人： HOYA CORPORATION
CPC分类号： G11B5/82 , G11B5/7315 , G11B5/8404
摘要： A magnetic-disk glass substrate has a circular hole at a center, and includes a pair of main surfaces and a side wall surface orthogonal to the main surfaces. A roundness of the circular hole is 1.5 μm or less. A difference between a maximum value and a minimum value of radii of three inscribed circles that are respectively derived from outlines in the circumferential direction at three positions spaced apart by 200 μm in a substrate thickness direction on the side wall surface of the circular hole is 3.5 μm or less.
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公开(公告)号：US09595283B2
公开(公告)日：2017-03-14
申请号：US14652365
申请日：2013-12-27
申请人： Masanori Tamaki
发明人： Masanori Tamaki
CPC分类号： G11B5/7315 , G11B5/82 , G11B5/8404
摘要： A magnetic-disk glass substrate capable of suppressing turbulence of air flow in a vicinity of an outer circumferential side edge portion of the magnetic disk and suppressing disk flutter is provided. This magnetic-disk glass substrate includes a pair of main surfaces, a side wall surface formed on an outer circumferential side edge surface, and chamfered surfaces interposed between the side wall surface and the main surfaces, respectively. The side wall surface has a roundness of 1.5 μm or less. A difference in radius between an inscribed circle and a circumcircle of a plurality of outlines of the side wall surface at a plurality of positions that include a central position of the magnetic-disk glass substrate in a thickness direction and are different from each other in the thickness direction is 5 μm or less.
摘要翻译： 提供一种磁盘玻璃基板，其能够抑制磁盘的外周侧边缘部分附近的气流的紊流并抑制磁盘颤动。 该磁盘玻璃基板包括一对主表面，形成在外周侧边缘表面上的侧壁表面和分别介于侧壁表面和主表面之间的倒角表面。 侧壁表面的圆度为1.5μm以下。 在包括磁盘玻璃基板的厚度方向的中心位置的多个位置处的侧壁面的多个轮廓的内切圆与外接圆之间的半径的差异在 厚度方向为5μm以下。
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公开(公告)号：US20160372147A1
公开(公告)日：2016-12-22
申请号：US15122377
申请日：2015-03-31
申请人： HOYA CORPORATION
发明人： Shuhei AZUMA
CPC分类号： G11B5/7315 , B24B1/00 , B24B9/107 , B24B31/112 , C03C15/00 , C03C21/002 , C03C2214/08 , G11B5/82
摘要： An edge surface of a magnetic-disk glass substrate containing an alkali metal component as a glass composition is a mirror surface, and in a bearing ratio curve of roughness cross-sectional areas obtained by measuring a surface roughness of the edge surface obtained by etching the edge surface by 2.5 μm, a roughness percentage when a bearing ratio of a roughness cross-sectional area is 50% is 40% or more.
摘要翻译： 含有作为玻璃组合物的碱金属成分的磁盘玻璃基板的边缘表面是镜面，并且在通过测量通过蚀刻所获得的边缘表面的表面粗糙度而获得的粗糙度横截面积的轴承比曲线 边缘表面为2.5μm时，粗糙度横截面积的轴承比为50％时的粗糙度为40％以上。
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公开(公告)号：US09508374B2
公开(公告)日：2016-11-29
申请号：US15174177
申请日：2016-06-06
发明人： Koji Adachi , Ian J. Beresford , Thomas Y. Chang , Kuo Hsing Hwang , James Hennessy , David Perez
CPC分类号： G11B5/82 , G11B5/39 , G11B5/4813 , G11B5/5526 , G11B5/7315 , G11B19/2009 , G11B19/28 , G11B20/1217 , G11B33/02 , G11B33/027 , G11B2020/1238
摘要： A hard disc drive (HDD) with an enlarged magnetic recording disc. In some embodiments, a base deck and top cover are arranged to provide an HDD housing with a 2½ inch form factor or a 3½ inch form factor. A magnetic recording disc is supported for rotation within the housing. A data transducer is controllably advanced across a recording surface of the magnetic recording disc to write data to the recording surface, and a printed circuit board assembly (PCBA) affixed to an external surface of the base deck incorporates control electronics to provide write signals to the data transducer during the writing of data to the recording surface. The disc has an outer diameter of at least 67 millimeters, mm for the 2½ inch form factor housing and has an outer diameter of at least 97 mm for the 3½ inch form factor housing.
摘要翻译： 具有放大磁记录盘的硬盘驱动器（HDD）。 在一些实施例中，基座甲板和顶盖布置成提供具有2 1/2英寸外形尺寸或3½英寸外形尺寸的HDD外壳。 磁记录盘被支撑以在壳体内旋转。 数据传感器可控地前进在磁记录盘的记录表面上以将数据写入记录表面，并且固定到基座的外表面的印刷电路板组件（PCBA）包含控制电子装置，以向 在将数据写入记录表面期间的数据传感器。 该盘具有至少67毫米的外径，对于2½英寸外形尺寸外壳而言为mm，对于3½英寸外形尺寸外壳，其外径至少为97毫米。
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公开(公告)号：US09437235B2
公开(公告)日：2016-09-06
申请号：US14948694
申请日：2015-11-23
申请人： HOYA CORPORATION
发明人： Yasuhiro Saito , Toshiaki Hashimoto , Yuriko Kudoh
IPC分类号： C03C19/00 , C03C15/02 , G11B5/73 , G11B5/84 , C03C15/00 , C03C23/00 , G11B7/2531 , G11B7/24027 , C03C3/087 , G11B5/127 , G11B5/82
CPC分类号： G11B5/7315 , C03C3/087 , C03C15/00 , C03C19/00 , C03C23/0075 , G11B5/127 , G11B5/82 , G11B5/8404 , G11B7/24027 , G11B7/2531
摘要： The present invention relates to a method for manufacturing a glass substrate for an information recording medium having a high level of cleanness and superior smoothness. The manufacturing method includes a step for washing a disk-shaped glass plate with an acid washing liquid, a step for removing at least part of a surface layer, which is formed on the surface of the glass plate, by performing grinding with diamond abrasion grains, and a step for washing the surface with a neutral or alkaline washing liquid.
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公开(公告)号：US20150213823A1
公开(公告)日：2015-07-30
申请号：US14678925
申请日：2015-04-03
发明人： Shinji UCHIDA
CPC分类号： G11B5/653 , G11B5/1278 , G11B5/65 , G11B5/7315 , G11B5/7325 , G11B5/738 , G11B5/82
摘要： A perpendicular magnetic recording medium includes a non-magnetic substrate; an underlayer including first and second underlayers; and a magnetic recording layer including a layer having a granular structure including grains of a magnetic crystal and grain boundary portions, wherein the first underlayer has a NaCl structure with a (001) orientation and contains a nitride or an oxide of at least one element. The first underlayer may contain a nitride of at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, and B, and the second underlayer may include a plurality of island-shaped regions and contain at least one of Mg, Ca, Co, and Ni. The first underlayer may contains an oxide of at least one of Mg, Ca, Co, and Ni, and the second underlayer may include net-shaped regions and contain at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, B, and C.
摘要翻译： 垂直磁记录介质包括非磁性基片; 包括第一和第二底层的底层; 以及包括具有包括磁性晶粒和晶界部分的颗粒的颗粒结构的层的磁记录层，其中第一底层具有（001）取向的NaCl结构并且包含至少一种元素的氮化物或氧化物。 第一底层可以包含Cr，V，Ti，Sc，Mo，Nb，Zr，Y，Al和B中的至少一种的氮化物，并且第二底层可以包括多个岛状区域并且至少包含 Mg，Ca，Co和Ni之一。 第一底层可以包含Mg，Ca，Co和Ni中的至少一种的氧化物，第二底层可以包括网状区域并且包含Cr，V，Ti，Sc，Mo，Nb，Zr中的至少一种 ，Y，Al，B和C.
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公开(公告)号：US20150077877A1
公开(公告)日：2015-03-19
申请号：US14552189
申请日：2014-11-24
发明人： Koji Adachi , Ian J. Beresford , Thomas Y. Chang , Kuo Hsing Hwang , Jim P. Hennessy , David Perez
IPC分类号： G11B5/82
CPC分类号： G11B5/82 , G11B5/39 , G11B5/4813 , G11B5/5526 , G11B5/7315 , G11B19/2009 , G11B19/28 , G11B20/1217 , G11B33/02 , G11B33/027 , G11B2020/1238
摘要： An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above.
摘要翻译： 用于诸如硬盘驱动器（HDD）的数据存储装置中的用于磁记录介质的放大的基板。 在一些实施例中，一种装置包括用于安装在3½英寸形状因数硬盘驱动器中的用于磁记录盘的基板，该基板具有标称从96.9mm至100.4mm的总直径。 在其他实施例中，一种装置包括用于安装在1/2英寸形状因数硬盘驱动器中的用于磁记录盘的基板，该基板具有标称从66.9mm至71.8mm的总直径。 在其他实施例中，数据存储装置具有使用如上所述的放大基板的磁记录介质。
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