1
Tokuhiro Tsukiyama, Hiroshi Yashiki, Osamu Hirose: Method and apparatus for data compression and restoration. Hitachi, Hitachi Computer Peripherals Co, Kenyon & Kenyon, October 3, 1989: US04872009 (107 worldwide citation)

A method of data compression for recording data on a recording medium such as a magentic tape, a method of data restoration for data which has been compressed for recording, and an apparatus of data compression and restoration prescribe the data to be compressed based on type or value and encode the ...


2
Takaaki Shirakura, Shinya Matsuoka, Hiroshi Yashiki, Masanori Arayashiki, Masaki Ohura: Magnetic disk medium with circumferentially textured surfaces and varied surface roughness and method of producing the same. Hitachi, Kenyon & Kenyon, July 3, 1990: US04939614 (23 worldwide citation)

A magnetic disk medium in which texture working is performed on surfaces of a substrate or on surfaces of subbing films provided on the substrate to attain circumferential worked-traces so that the contact start stop area thereof is different from the recording/reproducing area thereof in roughness ...


3
Hiroshi Yashiki, Kenji Morita: Superprecision lathe. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, August 30, 1988: US04766788 (18 worldwide citation)

In a superprecision lathe of the present invention, a main spindle having mounted at one end thereof a vacuum chuck rotatably supported in an air bearing fixed on a headstock. There is formed within the main spindle a first vacuum passage connected to the vacuum chuck and opened at the outer surface ...


4
Norikazu Nagase, Yoshihiro Moriguchi, Youichi Inomata, Hiroshi Yashiki, Masaki Ohura, Yoshiki Kato: Magnetic disk manufacturing method. Hitachi, Evenson McKeown Edwards & Lenahan, May 2, 1995: US05411630 (16 worldwide citation)

A method of forming projections on major surfaces of a disk comprises the steps of supporting the disk in a space, spraying a multiplicity of fine solid particles into the space, charging the sprayed fine solid particles with electricity of the same polarity so that the fine solid particles are floa ...


5
Hideaki Tanaka, Kenichi Gomi, Yoshihiko Miyake, Sigeru Sano, Youichi Inomata, Hiroshi Yashiki, Yoshiki Kato, Masaki Ohura: Magnetic disk including protective layer having surface with protusions and magnetic disk apparatus including the magnetic disk. Hitachi, Antonelli Terry Stout & Kraus, April 2, 1996: US05504646 (14 worldwide citation)

There is provided a magnetic disk apparatus comprising: at least one magnetic disk having a magnetic layer and a surface protective layer on a substrate; a magnetic head which faces the magnetic disk in a rotating state with a micro gap and is supported by a slider; rotating means for rotating the m ...


6
Fuminori Ishikawa, Hideaki Tanaka, Toshinori Hirano, Hiroko Saito, Kenichi Gomi, Hiroshi Yashiki, Youichi Inomata, Yoshihiro Moriguchi: Magnetic recording medium comprising a protective layer having specified electrical resistivity and density. Hitachi, Antonelli Terry Stout & Kraus, June 30, 1998: US05773124 (14 worldwide citation)

This invention relates to the magnetic recording medium, its manufacturing method and the magnetic disk apparatus, in which the ferromagnetic thin film is formed on the substrate board, and the protective layer is provided on that. A Magnetic recording medium of the has at least one layer of the pro ...


7
Hiroshi Yashiki, Katsunori Nagao, Takamitsu Shimoide, Akihiko Yamaya: Polishing amount control system and method for same. Speedfam, Fitch Even Tabin & Flannery, May 16, 2000: US06062949 (14 worldwide citation)

A polishing amount control system and method for same which can quickly feed back the results of measurement of a coating layer of a workpiece to the next polishing work so as to improve the productivity of the workpieces and further enable high precision polishing work. The thicknesses of the plati ...


8
Hiroshi Yashiki, Yuusuke Inoue: Cleaning apparatus. Speedfam, Fitch Even Tabin & Flannery, March 28, 2000: US06041465 (10 worldwide citation)

A cleaning apparatus enables a workpiece to be rotated at a high speed over a long period, enables the outer and inner circumferences of the workpiece to be cleaned by a simple structure without provision of a special mechanism, and enables avoidance of formation of scratches in the radial direction ...


9
Hideaki Tanaka, Kenichi Gomi, Yoshihiko Miyake, Sigeru Sano, Youichi Inomata, Hiroshi Yashiki, Yoshiki Kato, Masaki Ohura: Magnetic disk including protective layer having surface with protrusions, and substrate therefor. Hitachi, Antonelli Terry Stout & Kraus, October 16, 2001: US06303205 (9 worldwide citation)

A magnetic disk includes a substrate, a magnetic layer, and a protective layer. At least one region of a surface of the magnetic disk has protrusions. A height of each of the protrusions is not less than 5 nm and not greater than 40 nm, and is within ±30% of an average height of the protrusions. A d ...


10
Hiroshi Yashiki, Kouji Ishibashi: Polishing system and method of control of same. Speedfam IPEC Corporation, Fitch Even Tabin & Flannery, June 13, 2000: US06074275 (9 worldwide citation)

A polishing system and a method of control of the same enabling reliable transfer of the workpieces into and out of the system while maintaining the precision of polishing of the workpieces. Provision is made of a polishing apparatus 1, a first transfer apparatus 2, a second transfer apparatus 3, an ...