Ebara Corporation

Juichi Ishiguro

Kenji Watanabe

Masahiro Hatakeyama

Tohru Satake

Katsunori Ichiki

Kazuo Yamauchi

Shinta Kunitomo

Yasushi Tohma

Norio Takahashi

Satoshi Kawamura

Nobumitsu Kitashima

It is an object of the present invention to provide a method of making a magnetic disk having a uniform textured structure with micro-waviness of fabrication depth of less than 20 nm, preferably less than 10 nm, and a local depth deviation of less than 5%, in which texture patterns are characterized by the fact that lateral surfaces of the structure are sloped or curved. The object has been achieved in a method for making a magnetic disk, having micro-waviness on a fabrication surface of a substrate for reducing dynamic friction and controlling head float, by rotating and irradiating the fabrication surface with a high energy beam from a beam surface at an inclined angle to the substrate surface. The surface is irradiated through a shielding mask having a specific pattern, so as to produce a transcription pattern on the substrate surface to produce a textured structure with micro-waviness having sloped or curved side surfaces.

Magnetic disk and method of making thereof

It is an object of the present invention to provide a method of making a magnetic disk having a uniform textured structure with micro-waviness of fabrication depth of less than 20 nm, preferably less than 10 nm, and a local depth deviation of less than 5%, in which texture patterns are characterized by the fact that lateral surfaces of the structure are sloped or curved. The object has been achieved in a method for making a magnetic disk having micro-waviness on a fabrication surface of a substrate for reducing dynamic friction and controlling head float, by rotating and irradiating the fabrication surface with a high energy beam from a beam source at an inclined angle to the substrate surface, through a shielding mask having a specific pattern, so as to process a transcription pattern on the substrate surface to produce a textured structure with micro-waviness having sloped or curved side surfaces.

Magnetic disc and method of manufacturing same

This invention provides a good coating metal capable of achieving permanent protection from crevice corrosion of austenitic stainless steel placed in corrosive environments. The coating metal of this invention is a Ni-base, Co-base or Ni-Co base metal by having incorporated therein a suitable amount of Cr, Mo, Fe, Si B, and other elements.

Coating metal for preventing the crevice corrosion of austenitic

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Yokohama, Japan

Juichi Ishiguro