Patents by Inventor Hiroshi Ikekame
Hiroshi Ikekame 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: 8482877Abstract: Embodiments of the present invention provide a servo write medium, method and device for writing servo information by self servo write on the servo region formed from a flat section of the discrete track medium. The recording or write device yields the same servo characteristics as magnetic servo writing, is superior to pre-patterned servo, and delivers a greater write storage capacity with an even higher recording density. According to one embodiment, a self servo write method is used to write servo information on a flat section formed on a patterned disk on which discrete tracks are formed. Timing detection patterns (grooves) required for controlling the timing along the periphery during self servo write are formed by pre-patterning on the disk, and RRO error signals used for positioning control along the radius are written in the servo information on a flat section of the disk.Type: GrantFiled: March 26, 2008Date of Patent: July 9, 2013Assignee: HGST Netherlands B.V.Inventors: Kyo Akagi, Hiroshi Ikekame
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Patent number: 7936536Abstract: In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.Type: GrantFiled: July 20, 2007Date of Patent: May 3, 2011Assignee: Hitachi, Ltd.Inventors: Ryuji Tsuchiyama, Masahumi Mochizuki, Kyosuke Ono, Yuko Tsuchiya, Hiroshi Ikekame
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Publication number: 20080239906Abstract: Embodiments of the present invention provide a servo write medium, method and device for writing servo information by self servo write on the servo region formed from a flat section of the discrete track medium. The recording or write device yields the same servo characteristics as magnetic servo writing, is superior to pre-patterned servo, and delivers a greater write storage capacity with an even higher recording density. According to one embodiment, a self servo write method is used to write servo information on a flat section formed on a patterned disk on which discrete tracks are formed. Timing detection patterns (grooves) required for controlling the timing along the periphery during self servo write are formed by pre-patterning on the disk, and RRO error signals used for positioning control along the radius are written in the servo information on a flat section of the disk.Type: ApplicationFiled: March 26, 2008Publication date: October 2, 2008Inventors: Kyo Akagi, Hiroshi Ikekame
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Publication number: 20080049359Abstract: In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.Type: ApplicationFiled: July 20, 2007Publication date: February 28, 2008Inventors: RYUJI TSUCHIYAMA, Masahumi Mochizuki, Kyosuke Ono, Yuko Tsuchiya, Hiroshi Ikekame
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Patent number: 7239124Abstract: A current measurement method for measuring a current that flows in a transmission line of an electric circuit including steps of installing a magnetooptical device in a magnetic field which is generated based upon current that flows in the transmission line, making a polarized light on the magnetooptical device, and acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.Type: GrantFiled: August 5, 2004Date of Patent: July 3, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventor: Hiroshi Ikekame
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Publication number: 20070116989Abstract: Provided is a medium fabrication technique, a recording medium and a hard disk drive, which achieve high recording density. To this end, (a) a magnetic layer is deposited on a substrate, and (b) a nano particle layer is deposited on the magnetic layer. Then, (c) the magnetic layer is etched by use of the nano particle layer as a mask, and (d) the nano particle layer is removed to form artificial magnetic grains, and thus an artificial granular magnetic recording medium is obtained.Type: ApplicationFiled: November 22, 2006Publication date: May 24, 2007Inventors: Hiroshi Ikekame, Yuko Tsuchiya, Masukazu Igarashi
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Patent number: 7154687Abstract: Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.Type: GrantFiled: January 25, 2005Date of Patent: December 26, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Hiroshi Ikekame, Takeo Yamashita
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Publication number: 20060093863Abstract: A discrete track type perpendicular magnetic recording medium and a manufacturing method thereof are provided where the crystallographic orientation and perpendicular magnetic anisotropy of the magnetic recording layer are excellent, the magnetic properties of the magnetic recording layer are not deteriorated by processing, the manufacturing cost is not expensive, and a complicated manufacturing process is not required. A concavo-convex pattern structure consisting of a convex part corresponding to the position of the data track recording magnetic information and a concave part corresponding to the position of the space between data tracks is provided, and the base layer for controlling crystallographic orientation and the magnetic recording layer are stacked without voids on the concave and convex parts along the concavo-convex pattern structure.Type: ApplicationFiled: August 10, 2005Publication date: May 4, 2006Inventors: Yuko Tsuchiya, Masafumi Mochizuki, Teruo Kohashi, Hiroshi Ikekame
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Patent number: 7016156Abstract: Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: GrantFiled: October 12, 2004Date of Patent: March 21, 2006Assignee: Hitachi, Ltd.Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano
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Publication number: 20050128618Abstract: Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.Type: ApplicationFiled: January 25, 2005Publication date: June 16, 2005Inventors: Hiroshi Ikekame, Takeo Yamashita
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Patent number: 6894874Abstract: Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: GrantFiled: July 23, 2003Date of Patent: May 17, 2005Assignee: Hitachi, Ltd.Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano
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Publication number: 20050063097Abstract: Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: ApplicationFiled: October 12, 2004Publication date: March 24, 2005Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano
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Patent number: 6870697Abstract: Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.Type: GrantFiled: June 10, 2003Date of Patent: March 22, 2005Assignee: Hitachi, Ltd.Inventors: Hiroshi Ikekame, Takeo Yamashita
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Publication number: 20050007093Abstract: A current measurement method for measuring a current that flows in a transmission line of an electric circuit including steps of installing a magnetooptical device in a magnetic field which is generated based upon current that flows in the transmission line, making a polarized light on the magnetooptical device, and acquiring a current based upon the variation of the polarization of reflected light from the magnetooptical device on which the polarized light is incident.Type: ApplicationFiled: August 5, 2004Publication date: January 13, 2005Inventor: Hiroshi Ikekame
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Patent number: 6833694Abstract: The object of the invention is to provide technique and an apparatus for precisely measuring high frequency current that flows in a transmission line of a small impedance load circuit. A current waveform can be measured in wide bandwidth (at high-time resolution) and at high sensitivity without processing DUT (nondestructive) and without having an effect of the impedance of the apparatus (noninvasive) by installing a magnetooptical device in a magnetic field generated based upon current that flows in the transmission line, applying a bias magnetic field to the magnetooptical device by a magnetic field generator, making polarized light incident under the control of a position so that detection sensitivity is maximum and detecting the variation of polarization included in reflected light from the magnetooptical device.Type: GrantFiled: June 26, 2003Date of Patent: December 21, 2004Assignee: Hitachi, Ltd.Inventor: Hiroshi Ikekame
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Publication number: 20040125489Abstract: Magnetic disk apparatus includes an electric wiringg capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: ApplicationFiled: July 23, 2003Publication date: July 1, 2004Applicant: Hitachi, Ltd.Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano
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Publication number: 20040051515Abstract: The object of the invention is to provide technique and an apparatus for precisely measuring high frequency current that flows in a transmission line of a small impedance load circuit. A current waveform can be measured in wide bandwidth (at high-time resolution) and at high sensitivity without processing DUT (nondestructive) and without having an effect of the impedance of the apparatus (noninvasive) by installing a magnetooptical device in a magnetic field generated based upon current that flows in the transmission line, applying a bias magnetic field to the magnetooptical device by a magnetic field generator, making polarized light incident under the control of a position so that detection sensitivity is maximum and detecting the variation of polarization included in reflected light from the magnetooptical device.Type: ApplicationFiled: June 26, 2003Publication date: March 18, 2004Inventor: Hiroshi Ikekame
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Publication number: 20030234997Abstract: Devices and methods for generating a magnetic head-specific overshoot current which is combined with an alternating current waveform into a write current used by the magnetic head to store information on a magnetic medium. A processor analyzes the frequency of incoming write data and retrieves from a data table of an overshoot current amplitude and an overshoot current phase. This amplitude and phase information is sent to an overshoot current generator to generate an overshoot current that is responsive to the dynamic impedance properties of a magnetic write head during operation. The data table may have information related to one or many write heads, and the data table may be further subdivided based on additional dynamic characteristics of a write head that may affect the impedance thereof.Type: ApplicationFiled: June 10, 2003Publication date: December 25, 2003Applicant: Hitachi, Ltd.Inventors: Hiroshi Ikekame, Takeo Yamashita
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Patent number: 6661613Abstract: Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: GrantFiled: December 13, 2002Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano
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Publication number: 20030103294Abstract: Magnetic disk apparatus includes an electric wiring capable of satisfying an electric condition under which high frequency recording higher than or equal to 200 MHz, a magnetic head having at least a recording device to a magnetic recording medium, and also the electric wiring corresponding to a recording current supplying device to this magnetic head are formed on a suspension member for mechanically suspending the magnetic head, the recording current being supplied to a magnetic head recording device by employing such electric wiring, the characteristic impedance of which is higher than a maximum impedance of the magnetic head recording device.Type: ApplicationFiled: December 13, 2002Publication date: June 5, 2003Applicant: Hitachi, Ltd.Inventors: Yohji Maruyama, Hiroshi Ikekame, Hisashi Takano