Patents by Inventor Akira Osaki
Akira Osaki 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: 8098448Abstract: A method for dividing a data area on a disk into a plurality of concentric zones and determining a format for each zone so that data tracks in the zone have the same number of data sectors. The method includes dividing a data area into a plurality of zones with provisional boundaries. The method also includes determining a linear recording density for a selected zone. The method further includes selecting the number of data sectors per data track corresponding to the determined linear recording density from specified values. Moreover, the method includes resetting a boundary of the zone at a new boundary shifted from the provisional boundary according to a selected value.Type: GrantFiled: December 16, 2009Date of Patent: January 17, 2012Assignee: Hitachi Global Storage Technologies, Netherlands B.V.Inventors: Yoshihiko Maeda, Masaomi Ikeda, Nobuhiro Kuwamura, Toshihiko Tsunokawa, Akira Osaki
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Publication number: 20110085259Abstract: A method for dividing a data area on a disk into a plurality of concentric zones and determining a format for each zone so that data tracks in the zone have the same number of data sectors. The method includes dividing a data area into a plurality of zones with provisional boundaries. The method also includes determining a linear recording density for a selected zone. The method further includes selecting the number of data sectors per data track corresponding to the determined linear recording density from specified values. Moreover, the method includes resetting a boundary of the zone at a new boundary shifted from the provisional boundary according to a selected value.Type: ApplicationFiled: December 16, 2009Publication date: April 14, 2011Inventors: Yoshihiko MAEDA, Masaomi Ikeda, Nobuhiro Kuwamura, Toshihiko Tsunokawa, Akira Osaki
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Patent number: 6985321Abstract: A head suspension assembly having a magnetic head, an arm which is supported so as to rotate, a suspension having one end which is fixed to an end of the arm and an other end which mounts the magnetic head, a nonvolatile memory which is mounted on the suspension assembly, and stores control parameters of the magnetic head, a connecting terminal which is mounted to the arm, and a signal transmission line which electrically connects the connecting terminal to the nonvolatile memory and the magnetic head. The connecting terminal enables transmission of signals at least one of to and from the head suspension assembly, the nonvolatile memory and the magnetic head.Type: GrantFiled: March 9, 2004Date of Patent: January 10, 2006Assignee: Hitachi, Ltd.Inventor: Akira Osaki
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Publication number: 20040169951Abstract: A head suspension assembly having a magnetic head, an arm which is supported so as to rotate, a suspension having one end which is fixed to an end of the arm and an other end which mounts the magnetic head, a nonvolatile memory which is mounted on the suspension assembly, and stores control parameters of the magnetic head, a connecting terminal which is mounted to the arm, and a signal transmission line which electrically connects the connecting terminal to the nonvolatile memory and the magnetic head. The connecting terminal enables transmission of signals at least one of to and from the head suspension assembly, the nonvolatile memory and the magnetic head.Type: ApplicationFiled: March 9, 2004Publication date: September 2, 2004Inventor: Akira Osaki
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Patent number: 6707628Abstract: A head suspension assembly 4 has an arm 17 supported so as to rotate, an elastically flexible suspension 16 having one end which is fixed to an end of the arm and the other end has a magnetic head 2 mounted thereon, and a signal transmission line 18 fixed on the suspension and the arm which connects the magnetic head with a main FPC.Type: GrantFiled: February 20, 2001Date of Patent: March 16, 2004Assignee: Hitachi, Ltd.Inventor: Akira Osaki
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Publication number: 20010043419Abstract: A head suspension assembly 4 having an arm 17 supported so as to rotate, an elastically flexible suspension 16 of which one end is fixed to an end of the arm and other end mounts a magnetic head 2, and a signal transmission line 18 fixed on the suspension and the arm which connects the magnetic head with a main FPC, wherein a head amplifier 8 which transmits and receives signals to and from the magnetic head and a nonvolatile memory 9 which stores optimized control parameters of the magnetic head and the head amplifier are mounted together on the head suspension assembly and the head amplifier and the nonvolatile memory are electrically connected to the signal transmission line.Type: ApplicationFiled: February 20, 2001Publication date: November 22, 2001Inventor: Akira Osaki
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Patent number: 6057021Abstract: In a magnetic recording medium having a non-magnetic disk substrate and a magnetic film formed on the surface of the non-magnetic disk substrate, a surface average roughness factor Ra(r) on the surface of the medium being from 0.3 nm to 3 nm, an orientation ratio of coercivity being from 0.1 to 0.7, and an in-plane magnetic anisotropic energy being from 3.times.10.sup.4 J/m.sup.3 to 5.times.10.sup.5 J/m.sup.3. By using such a medium, it is possible to provide a magnetic recording apparatus in which the magnetic head is capable of flying in a low position and high-density recording is achieved.Type: GrantFiled: October 6, 1997Date of Patent: May 2, 2000Assignee: Hitachi, Ltd.Inventors: Akira Ishikawa, Yuzuru Hosoe, Yoshihiro Shiroishi, Masatoshi Takeshita, Yotsuo Yahisa, Tomoo Yamamoto, Akira Osaki, Kiwamu Tanahashi, Jun Fumioka, Yoshiki Kato, Masaki Ohura, Yukio Katoh
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Patent number: 5815343Abstract: A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta.Type: GrantFiled: October 27, 1997Date of Patent: September 29, 1998Assignee: Hitachi, Ltd.Inventors: Akira Ishikawa, Yoshihiro Shiroishi, Yuzuru Hosoe, Yotsuo Yahisa, Tomoo Yamamoto, Masukazu Igarashi, Akira Osaki, Yoshiki Kato, Jun Fumioka
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Patent number: 5750230Abstract: In a magnetic recording medium having a nonmagnetic disk substrate and a magnetic film formed on the surface of the non-magnetic disk substrate, a surface average roughness factor Ra(r) on the surface of the medium being from 0.3 nm to 3 nm, an orientation ratio of coercivity being from 0.1 to 0.7, and an in-plane magnetic anisotropic energy being from 3.times.10.sup.4 J/m.sup.3 to 5.times.10.sup.5 J/m.sup.3. By using such a medium, it is possible to provide a magnetic recording apparatus in which the magnetic head is capable of flying in a low position and high-density recording is achieved.Type: GrantFiled: November 22, 1993Date of Patent: May 12, 1998Assignee: Hitachi, Ltd.Inventors: Akira Ishikawa, Yuzuru Hosoe, Yoshihiro Shiroishi, Masatoshi Takeshita, Yotsuo Yahisa, Tomoo Yamamoto, Akira Osaki, Kiwamu Tanahashi, Jun Fumioka, Yoshiki Kato, Masaki Ohura, Yukio Katoh
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Patent number: 5723198Abstract: In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers.Type: GrantFiled: June 13, 1994Date of Patent: March 3, 1998Assignee: Hitachi, Ltd.Inventors: Yuzuru Hosoe, Yoshihiro Shiroishi, Akira Ishikawa, Futoshi Tomiyama, Kazuetsu Yoshida, Tomoo Yamamoto, Yotsuo Yahisa, Akira Osaki, Katsuo Abe, Shinji Narishige, Naoki Kodama, Kiwamu Tanahashi, Emi Mangyo
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Patent number: 5618639Abstract: A magnetic recording medium used in a magnetic recording apparatus has a non-magnetic substrate, a magnetic film formed on the substrate, an optional protective film formed on the magnetic film and a lubricating layer formed on the top surface of the medium. The lubricating layer is made of an organic polymer lubricant having molecules with an interstitial radius of not more that 0.31 nm. The interstitial radius is affected by coating the lubricant on the protective film after the protective film has been cleaned with a surface treatment, such as an oxygen plasma treatment or an ozone treatment. By maintaining the interstitial radius between molecules of the lubricant layer equal to or less than 0.31 nm, water and corrosive molecules in water cannot penetrate the lubricating layer and corrode the magnetic film. Also, the lubricant layer provides good sliding durability with a resultant long CSS life.Type: GrantFiled: June 28, 1994Date of Patent: April 8, 1997Assignee: Hitachi, Ltd.Inventors: Tomoyuki Ohno, Yoshihiro Shiroishi, Yotsuo Yahisa, Akira Osaki, Yuichi Ootani
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Patent number: 5000982Abstract: A magnetic recording medium comprising a substrate and, formed thereon, a magnetic layer comprised of magnetic particles bonded to each other with a thermosetting binder can be improved with respect to the durability by forming a number of fine pores in the magnetic layer and impregnating the fine pores with a lubricant. Particularly, when the fine pores have a diameter of 0.2 .mu.m or less and a rate of the fine pore in area of 3 to 30%, the durability can be improved while maintaining the noise during the recording and reproduction of information on a low level. In preparing the magnetic recording medium having such fine pores, it is preferred that an easily thermal-decomposable additive, such as polyalkylene oxide, be added to a magnetic layer forming paint.Type: GrantFiled: August 2, 1990Date of Patent: March 19, 1991Assignee: Hitachi, Ltd.Inventors: Heigo Ishihara, Akira Osaki, Waichi Nagashiro, Fuzio Maeda
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Patent number: 4985295Abstract: A magnetic recording medium comprising a substrate and, formed thereon, a magnetic layer comprised of magnetic particles bonded to each other with a thermosetting binder can be improved with respect to the durability by forming a number of fine pores in the magnetic layer and impregnating the fine pores with a lubricant. Particularly, when the fine pores have a diameter of 0.2 .mu.m or less and a rate of the fine pore in area of 3 to 30%, the durability can be improved while maintaining the noise during the recording and reproduction of information on a low level. In preparing the magnetic recording medium having such fine pores, it is preferred that an easily thermal-decomposable additive, such as polyalkylene oxide, be added to a magnetic layer forming paint.Type: GrantFiled: January 7, 1988Date of Patent: January 15, 1991Assignee: Hitachi, Ltd.Inventors: Heigo Ishihara, Akira Osaki, Waichi Nagashiro, Fuzio Maeda
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Patent number: 4966797Abstract: A magnetic recording medium is prepared by applying a magnetic paint containing at least magnetic particles and a thermally curable binder to a substrate, thermally curing the applied magnetic paint, thereby forming a magnetic film, and impregnating micropores formed in the magnetic film with a lubricant, where the magnetic paint further contains a poly(alkyleneoxide)-grafted binder, and the grafted poly(alkyleneoxide) moiety is thermally decomposed during the thermal curing, thereby forming the micropores in the magnetic film. A large number of micropores having a pore size of not more than 0.1 .mu.m are formed in the magnetic film, and a magnetic disk of high durability with less noises and errors during the recording and reproduction can be obtained.Type: GrantFiled: December 22, 1989Date of Patent: October 30, 1990Assignee: Hitachi Ltd.Inventors: Heigo Ishihara, Akira Osaki, Takanori Kudo