Patents by Inventor Hiromu Chiba
Hiromu Chiba 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: 8092560Abstract: Since structural portions of a device made of a plurality of materials are different from one another in mechanical hardness, it is very difficult to uniformly lap the structural portions. This is attributable to generation of machining recessions due to differences in lapped amount when large fixed abrasive grains are used, and generation of lapping marks caused by that the dropped abrasive grains rotate. Accordingly, in order to cope with the disadvantage, it is essential to surely grip abrasive grains of small size to a surface of a surface plate.Type: GrantFiled: November 8, 2006Date of Patent: January 10, 2012Assignee: Hitachi, Ltd.Inventors: Hiroshi Inaba, Hiromu Chiba, Xudong Yang, Shinji Sasaki, Nobuto Yasui
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Publication number: 20070122548Abstract: Since structural portions of a device made of a plurality of materials are different from one another in mechanical hardness, it is very difficult to uniformly lap the structural portions. This is attributable to generation of machining recessions due to differences in lapped amount when large fixed abrasive grains are used, and generation of lapping marks caused by that the dropped abrasive grains rotate. Accordingly, in order to cope with the disadvantage, it is essential to surely grip abrasive grains of small size to a surface of a surface plate.Type: ApplicationFiled: November 8, 2006Publication date: May 31, 2007Inventors: Hiroshi Inaba, Hiromu Chiba, Xudong Yang, Shinji Sasaki, Nobuto Yasui
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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: 6690544Abstract: A magnetic head slider including a plurality of rails adapted to face a magnetic disk. Each of the rails has a longitudinal extension direction substantially in a direction of rotation of the magnetic disk, and a protective film is provided on a floating surface of at least one of the rails. A thickness of the protective film at least in a direction transverse to the longitudinal extension direction of the at least one of the rails is not uniform in the transverse direction.Type: GrantFiled: December 17, 2002Date of Patent: February 10, 2004Assignee: Hitachi, Ltd.Inventors: Atsuko Okawa, Yasuo Hira, Hirotaka Imayama, Masayasu Fujisawa, Saburou Suzuki, Eisei Togawa, Noriyuki Saiki, Nobuo Suzuki, Hiroshi Agari, Kiyoshi Akamatsu, Hiromu Chiba
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Patent number: 6687089Abstract: A magnetic head is formed of materials having different hardnesses. The head includes a base coat formed on a substrate having a high hardness, for example alumina titanium carbide, upon which a base coat, for example alumina, is formed. The base coat typically had a thickness in the range of 0.05 to 0.5 &mgr;m. This structure provides an improved flying height for heads manufactured using a lapping process.Type: GrantFiled: November 20, 2001Date of Patent: February 3, 2004Assignee: Hitachi Ltd.Inventors: Hiromu Chiba, Kenji Furusawa, Toshio Tamura, Yuji Ochiai
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Publication number: 20030090840Abstract: A magnetic head slider including a plurality of rails adapted to face a magnetic disk. Each of the rails has a longitudinal extension direction substantially in a direction of rotation of the magnetic disk, and a protective film is provided on a floating surface of at least one of the rails. A thickness of the protective film at least in a direction transverse to the longitudinal extension direction of the at least one of the rails is not uniform in the transverse direction.Type: ApplicationFiled: December 17, 2002Publication date: May 15, 2003Inventors: Atsuko Okawa, Yasuo Hira, Hirotaka Imayama, Masayasu Fujisawa, Saburou Suzuki, Eisei Togawa, Noriyuki Saiki, Nobuo Suzuki, Hiroshi Agari, Kiyoshi Akamatsu, Hiromu Chiba
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Patent number: 6504680Abstract: A method of manufacturing a magnetic head slider for a magnetic head and the magnetic slider wherein the slider has non-linear rails formed in a floating surface thereof by processing including one of reactive ion etching, sputter etching and an ion milling, and side walls of the non-linear rails are polished after formation of the non-linear rails by the processing.Type: GrantFiled: August 13, 2001Date of Patent: January 7, 2003Assignee: Hitachi, Ltd.Inventors: Atsuko Okawa, Yasuo Hira, Hirotaka Imayama, Masayasu Fujisawa, Saburou Suzuki, Eisei Togawa, Noriyuki Saiki, Nobuo Suzuki, Hiroshi Agari, Kiyoshi Akamatsu, Hiromu Chiba
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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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Publication number: 20020105758Abstract: In the lapping of a magnetic head formed of materials of different hardness levels, the film thickness of a base coat formed on a substrate having a high hardness is made to be in the range of 0.05 to 0.5 &mgr;m, and the lapping for producing the magnetic head is performed by use of a lapping plate made of a material of relatively low hardness, whereby it becomes possible to reduce a pole-tip recession into a range not more than 1 nm and to suppress the average surface roughness of a lapped surface into another range not less than 10 nm.Type: ApplicationFiled: November 20, 2001Publication date: August 8, 2002Applicant: Hitachi, Ltd.Inventors: Hiromu Chiba, Kenji Furusawa, Toshio Tamura, Yuji Ochiai
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Publication number: 20020027746Abstract: A method of manufacturing a magnetic head slider for a magnetic head and the magnetic slider wherein the slider has non-linear rails formed in a floating surface thereof by processing including one of reactive ion etching, sputter etching and an ion milling, and side walls of the non-linear rails are polished after formation of the non-linear rails by the processing.Type: ApplicationFiled: August 13, 2001Publication date: March 7, 2002Inventors: Atsuko Okawa, Yasuo Hira, Hirotaka Imayama, Masayasu Fujisawa, Saburou Suzuki, Eisei Togawa, Noriyuki Saiki, Nobuo Suzuki, Hiroshi Agari, Kiyoshi Akamatsu, Hiromu Chiba
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Patent number: 6278582Abstract: For removing re-deposited particulates produced during an etching process of a magnetic head slider and forming a minute chamfered portion, a polishing process is carried out by using polishing cloth such as non-woven polyester fabric after having formed rails of non-linear shape on a floating surface by the etching process. Thus, the re-deposited particulates produced during the etching process are removed, whereby the reliability of the floating characteristic of magnetic head is improved.Type: GrantFiled: December 21, 1999Date of Patent: August 21, 2001Assignee: Hiatchi, LTDInventors: Atsuko Okawa, Yasuo Hira, Hirotaka Imayama, Masayasu Fujisawa, Saburou Suzuki, Eisei Togawa, Noriyuki Saiki, Nobuo Suzuki, Hiroshi Agari, Kiyoshi Akamatsu, Hiromu Chiba
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Patent number: 5373985Abstract: A printed wiring board having an electronic component mounted thereon is disposed with a land of pattern directed downward, and the land and a lead terminal of the electronic component are irradiated with a light beam emitted upwardly and supplied with a solder forwarded upwardly.Type: GrantFiled: November 9, 1993Date of Patent: December 20, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromu Chiba, Makoto Kobayashi