Patents by Inventor Youichi Kawakubo
Youichi Kawakubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7385786Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface and a second surface provided at an air-outflow side at positions with respect to the first surface, and projections having a cylindrical shape are provided on a third surface at an air-inflow side at positions with respect to said first surface.Type: GrantFiled: June 26, 2006Date of Patent: June 10, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20060250717Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface and a second surface provided at an air-outflow side at positions with respect to the first surface, and projections having a cylindrical shape are provided on a third surface at an air-inflow side at positions with respect to said first surface.Type: ApplicationFiled: June 26, 2006Publication date: November 9, 2006Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 7072146Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.Type: GrantFiled: June 16, 2005Date of Patent: July 4, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 6985334Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side. Projections are provided at the air-inflow side respect to the first positive pressure generating portion on a surface which faces the magnetic disk upon read/write operation of the magnetic head slider.Type: GrantFiled: July 15, 2003Date of Patent: January 10, 2006Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20050243470Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.Type: ApplicationFiled: June 16, 2005Publication date: November 3, 2005Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20040012888Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side. Projections are provided at the air-inflow side respect to the first positive pressure generating portion on a surface which faces the magnetic disk upon read/write operation of the magnetic head slider.Type: ApplicationFiled: July 15, 2003Publication date: January 22, 2004Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 6597537Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface provided at an air-inflow side and a second surface provided at an air-outflow side. Projections are provided at the air-inflow side with respect to the first surface on a surface while faces the magnetic disk upon read/write operation of the magnetic head slider.Type: GrantFiled: August 14, 2002Date of Patent: July 22, 2003Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20020191344Abstract: A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first surface provided at an air-inflow side and a second surface provided at an air-outflow side. Projections are provided at the air-inflow side with respect to the first surface on a surface while faces the magnetic disk upon read/write operation of the magnetic head slider.Type: ApplicationFiled: August 14, 2002Publication date: December 19, 2002Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo
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Patent number: 6452751Abstract: A magnetic head slider having a magnetic head for reading/writing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has three surface portions with levels which are different from each other on a surface facing to the magnetic disk including a first surface portion forming a pad surface, a second surface portion having a level which is lower than a level of the first surface portion and a third surface portion having a level which is lower than that of the second surface portion. The second surface portion is provided at a side opposite to a side on which the magnetic head is mounted and the third surface portion is provided at the side on which the magnetic head is mounted. A projection is provided on the second surface portion.Type: GrantFiled: March 22, 2002Date of Patent: September 17, 2002Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Publication number: 20020097524Abstract: A magnetic head slider having a magnetic head for reading/writing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has three surface portions with levels which are different from each other on a surface facing to the magnetic disk including a first surface portion forming a pad surface, a second surface portion having a level which is lower than a level of the first surface portion and a third surface portion having a level which is lower than that of the second surface portion. The second surface portion is provided at a side opposite to a side on which the magnetic head is mounted and the third surface portion is provided at the side on which the magnetic head is mounted. A projection is provided on the second surface portion.Type: ApplicationFiled: March 22, 2002Publication date: July 25, 2002Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 6373661Abstract: A magnetic disk device and a flying slider, having a magnetic head for reading and writing information, are disclosed. The magnetic head slider includes flying pads of a stepped configuration for flying the slider, and each of the flying pads has a flat surface portion and a step surface recessed from this flat surface portion through a microscopic step. Microscopic projections are formed on the step surface. The height of the microscopic projections are higher than or substantially equal to the height of the step. With this construction, the slider is less liable to be turned to lean forward because of the provision of the microscopic projections, and beside a front edge of the step surface will not damage a magnetic disk surface. A variation of the flying height can be reduced by a negative pressure produced at the rear side of each microscopic projection. Therefore, there can be provided the magnetic disk device having high reliability and a large capacity.Type: GrantFiled: April 28, 1999Date of Patent: April 16, 2002Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Mieko Ishii, Ryuji Tsuchiyama, Youichi Kawakubo, Hiromitsu Tokisue
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Patent number: 5548454Abstract: In the information recording disk, the positioning signal of the information convertor is provided permanently, as a change in shape or material, to the front and reverse surfaces of the disk substrate and their eccentric distances from the center position is made to be smaller than half the repeating unit length of the positioning signal of the information convertor in the radial direction. The start position of the positioning signal in the circumferential direction is preferably made to be coincident on the front and reverse surfaces of the disk substrate within 10 .mu.m. The position reference for aligning the position in the radial direction or the position reference for aligning the rotation angle position in the circumferential direction is preferably disposed on the inner diameter portion or outer diameter portion of the disk substrate, respectively, and these position references can be accomplished by disposing at least one notch on the inner or outer peripheral edge portion of the disk substrate.Type: GrantFiled: January 25, 1990Date of Patent: August 20, 1996Assignee: Hitachi, Ltd.Inventors: Youichi Kawakubo, Yoshio Kawamura, Yosuke Seo
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Patent number: 5020041Abstract: A magneto-optical memory apparatus has an optical head for applying a light to a substrate of a recording medium such as a magneto-optical disk having a magneto-optical recording film formed on the substrate and continuously applying a high power laser beam in a record mode, and a floating magnetic head arranged on the opposite side of the recording medium to the side of the optical head and adapted to be kept at a substantially constant distance from the recording medium by an air pressure created between the magnetic head and the recording medium by the movement of the recording medium, for applying, in the record mode, a magnetic field which is polarity-inverted or intensity-modulated according to information to be recorded, to the magneto-optical recording film.Type: GrantFiled: February 8, 1988Date of Patent: May 28, 1991Assignee: Hitachi, Ltd.Inventors: Takeshi Nakao, Masahiro Ojima, Yoshinori Miyamura, Toyoji Okuwaki, Youichi Kawakubo, Yoshinori Takeuchi, Yuzo Yamaguchi
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Patent number: 4721646Abstract: A magnetic recording medium of the present invention comprises: a substrate; a magnetic film formed on this substrate; and a nonmagnetic reinforcing agent mixed into the magnetic film and projected from the surface of the magnetic film. Assuming that the minimum flying height of the magnetic head which is lifted up over the magnetic film is h, a projection height T of the nonmagnetic reinforcing agent from the surface of the magnetic film satisfies the relation of h/4<T<h. By virtue of this, even if an amount of mixture of the nonmagnetic reinforcing agent which becomes a cause of the generation of the noises is reduced, the necessary durability can be obtained.Type: GrantFiled: August 28, 1986Date of Patent: January 26, 1988Assignee: Hitachi, Ltd.Inventors: Keigo Iechika, Fuzio Maeda, Masa-aki Imamura, Yoshiki Kato, Eiichi Takasuna, Youichi Kawakubo