Patents by Inventor Akio Takakura
Akio Takakura 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: 7147540Abstract: In order to realize a shape of an air bearing surface of a magnetic head slider which is capable of coping with a lowering of flying height and which has high reliability, at the time of polishing the air bearing surface of the magnetic head slider by bringing the air bearing surface and the surface of a polishing machine into contact with each other, machining is conducted in the condition where the stiffness acting between both the members is enhanced, and the standard deviation of the flatness of the air bearing surface machined and the standard deviation of the recess amount between the air bearing surface and a magnetic element are controlled. Thus, it is possible to efficiently manufacture a magnetic head slider which enables driving at a low flying height.Type: GrantFiled: March 6, 2003Date of Patent: December 12, 2006Assignee: Hitachi Global Storage Technologies Japan Ltd.Inventors: Hideaki Tanaka, Kenji Furusawa, Takateru Seki, Akio Takakura, Yukihiro Isono
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Patent number: 7085103Abstract: A magnetic head slider, for sliding on a magnetic disk, which has a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess which is deeper than the front step bearing, is formed as a recess from the rail surf ace, and a side step bearing with a depth identical to that of the front step bearing is made from the rail surface. Side padB are provided which each have a width W and length L, wherein W is greater than L.Type: GrantFiled: December 14, 2004Date of Patent: August 1, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
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Publication number: 20050280941Abstract: In order to realize a shape of an air bearing surface of a magnetic head slider which is capable of coping with a lowering of flying height and which has high reliability, at the time of polishing the air bearing surface of the magnetic head slider by bringing the air bearing surface and the surface of a polishing machine into contact with each other, machining is conducted in the condition where the stiffness acting between both the members is enhanced, and the standard deviation of the flatness of the air bearing surface machined and the standard deviation of the recess amount between the air bearing surface and a magnetic element are controlled. Thus, it is possible to efficiently manufacture a magnetic head slider which enables driving at a low flying height.Type: ApplicationFiled: March 6, 2003Publication date: December 22, 2005Applicant: Hitachi, Ltd.Inventors: Hideaki Tanaka, Kenji Furusawa, Takateru Seki, Akio Takakura, Yukihiro Isono
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Patent number: 6920016Abstract: A thin film magnetic head includes a three-step configuration including deep and shallow groove surfaces, a super shallow groove surface, and an air bearing surface, and also, island-shaped center rail is provided in the center of the air outflow end of the disk-facing air bearing surface having a boundary on the surface of base alumina between a head element portion and a substrate, without including the surface of the substrate. Further, by providing in the surface of the substrate the super shallow groove surface shallower than a shallow groove surface, an alumina recession between the surface of the substrate and the head element portion, produced in a shallow dual step sub ambient slider, can be eliminated. Magnetic spacing between the head of the head element portion and the magnetic layer of the disk can be thereby reduced.Type: GrantFiled: December 31, 2002Date of Patent: July 19, 2005Assignee: Hitachi, Ltd.Inventors: Hideo Yamakura, Shinji Sasaki, Hidetoshi Anan, Akio Takakura
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Publication number: 20050099729Abstract: A magnetic head slider for sliding on the magnetic disk, which comprises: a leading edge; a trailing edge, wherein the air bearing surface has a front step bearing with submicron depth of the air bearing surface was made from said leading edge in the continuity, a rail surface made from this front step bearing in the continuity, a negative pressure recess which is more profound than said front step bearing made in the continuity from this rail surface and a side step bearing with the depth identical with said front step bearing made in the continuity from the rail surface, whereby the ratio of depth R of said recess and depth ?s of said front step bearing is R/?s ?5.Type: ApplicationFiled: December 14, 2004Publication date: May 12, 2005Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
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Patent number: 6881124Abstract: An L-shaped slide plate mounted with a workpiece holding device on a slide guide is firmly attached to an angle adjustment mechanism, and a reciprocating motion drive unit mounted with the angle adjustment mechanism on a slider table is firmly attached to a bridge so that an angle between a surface of a workpiece to be lapped and a surface of a lapping plate is kept substantially constant, and also the bridge is disposed so as to stride the lapping plate. Thereby, in a state of row bar in which a plurality of magnetic head sliders run in a line, an air bearing surface of magnetic head can be lapped with high accuracy with an element recession being decreased and an occurrence of a scratch being restrained.Type: GrantFiled: December 18, 2001Date of Patent: April 19, 2005Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Toshio Takahashi, Hiromu Chiba, Takateru Seki, Hideaki Tanaka, Toshio Tamura, Minoru Yamasaka, Akio Takakura
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Patent number: 6842309Abstract: A magnetic head slider, for sliding on a magnetic disk, which comprises a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess, which is more profound than the front step bearing, is made from the rail surface, and a side step bearing with a depth identical to that of the front step bearing is made from the rail surface, wherein the ratio of depth R of the recess and depth ?s of the front step bearing is R/?s?5.Type: GrantFiled: August 27, 2003Date of Patent: January 11, 2005Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshihori Takeuohi, Shinsuke Higuchi, Akira Iida
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Publication number: 20040037006Abstract: A magnetic head slider for sliding on the magnetic disk, which comprises:Type: ApplicationFiled: August 27, 2003Publication date: February 26, 2004Applicant: Hitachi, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshihori Takeuohi, Shinsuke Higuchi, Akira Iida
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Publication number: 20040001285Abstract: In order to realize a shape of an air bearing surface of a magnetic head slider which is capable of coping with a lowering of flying height and which has high reliability, at the time of polishing the air bearing surface of the magnetic head slider by bringing the air bearing surface and the surface of a polishing machine into contact with each other, machining is conducted in the condition where the stiffness acting between both the members is enhanced, and the standard deviation of the flatness of the air bearing surface machined and the standard deviation of the recess amount between the air bearing surface and a magnetic element are controlled. Thus, it is possible to efficiently manufacture a magnetic head slider which enables driving at a low flying height.Type: ApplicationFiled: March 6, 2003Publication date: January 1, 2004Applicant: Hitachi, Ltd.Inventors: Hideaki Tanaka, Kenji Furusawa, Takateru Seki, Akio Takakura, Yukihiro Isono
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Publication number: 20030227716Abstract: A thin film magnetic head ncludes a three-step configuration including deep and shallow groove surfaces, a super shallow groove surface, and an air bearing surface, and also, island-shaped center rail is provided in the center of the air outflow end of the disk-facing air bearing surface having a boundary on the surface of base alumina between a head element portion and a substrate, without including the surface of the substrate. Further, by providing in the surface of the substrate the super shallow groove surface shallower than a shallow groove surface, an alumina recession between the surface of the substrate and the head element portion, produced in a shallow dual step sub ambient slider, can be eliminated. Magnetic spacing between the head of the head element portion and the magnetic layer of the disk can be thereby reduced.Type: ApplicationFiled: December 31, 2002Publication date: December 11, 2003Inventors: Hideo Yamakura, Shinji Sasaki, Hidetoshi Anan, Akio Takakura
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Patent number: 6628480Abstract: A magnetic head slider for sliding on a magnetic disk includes a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess which is more profound than the front step bearing is made from the rail surface, and a side step bearing having a depth identical with the front step bearing is made from the rail surface. The ratio of the depth R of the recess to the depth &dgr;S of the front step bearing is R/&dgr;s>5.Type: GrantFiled: August 3, 1999Date of Patent: September 30, 2003Assignee: Hitachi, Ltd.Inventors: Hidekazu Kohira, Masaaki Matsumoto, Kiyoshi Hashimoto, Masayoshi Endo, Akio Takakura, Yoshinori Takeuchi, Shinsuke Higuchi, Akira Iida
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Publication number: 20020135941Abstract: A magnetic head slider for sliding on the magnetic disk, which comprises: a leading edge; a trailing edge, wherein the air bearing surface has a front step bearing with submicron depth of the air bearing surface was made from said leading edge in the continuity, a rail surface made from this front step bearing in the continuity, a negative pressure recess which is more profound than said front step bearing made in the continuity from this rail surface and a side step bearing with the depth identical with said front step bearing made in the continuity from the rail surface, whereby the ratio of depth R of said recess and depth &dgr; s of said front step bearing is R/&dgr;s>5.Type: ApplicationFiled: August 3, 1999Publication date: September 26, 2002Inventors: HIDEKAZU KOHIRA, MASAAKI MATSUMOTO, KIYOSHI HASHIMOTO, MASAYOSHI ENDO, AKIO TAKAKURA, YOSHINORI TAKEUCHI, SHINSUKE HIGUCHI, AKIRA IIDA
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Publication number: 20020126421Abstract: An L-shaped slide plate mounted with a workpiece holding device on a slide guide is firmly attached to an angle adjustment mechanism, and a reciprocating motion drive unit mounted with the angle adjustment mechanism on a slider table is firmly attached to a bridge so that an angle between a surface of a workpiece to be lapped and a surface of a lapping plate is kept substantially constant, and also the bridge is disposed so as to stride the lapping plate. Thereby, in a state of row bar in which a plurality of magnetic head sliders run in a line, an air bearing surface of magnetic head can be lapped with high accuracy with an element recession being decreased and an occurrence of a scratch being restrained.Type: ApplicationFiled: December 18, 2001Publication date: September 12, 2002Applicant: Hitachi, Ltd.Inventors: Toshio Takahashi, Hiromu Chiba, Takateru Seki, Hideaki Tanaka, Toshio Tamura, Minoru Yamasaka, Akio Takakura
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Patent number: 5483734Abstract: A lower magnetic film, a magnetic gap layer, a conductor coil, an insulating layer for electrically insulating the conductor coil, an upper magnetic film and a protective film are laminated on a substrate. Formation data of a lamination step are collected. An optimum value of a magnetic gap depth G of the magnetic gap layer is calculated on the basis of the formation data. The magnetic gap depth is machined to the optimum value on the basis of the optimum value so calculated.Type: GrantFiled: September 8, 1993Date of Patent: January 16, 1996Assignee: Hitachi, Ltd.Inventors: Yukihiro Isono, Makoto Saito, Kazuyoshi Adachi, Masato Yumoto, Akio Takakura