Patents by Inventor Kyo Akagi
Kyo Akagi 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: 9202504Abstract: A method for producing a magnetic disk device includes injecting replacement gas into a hermetically-sealed enclosure by means of an injection nozzle while suctioning gas from inside of the hermetically-sealed enclosure by means of a suction nozzle in such a way that the gas pressure inside of the enclosure does not fall below the vapor pressure of the organic compounds present inside of the enclosure, wherein the hermetically-sealed enclosure houses within a magnetic disk for storing data, a magnetic head for writing/reading the data, and an actuator for moving the magnetic head relative to the magnetic disk, and wherein a gas injection port and a gas expulsion port are formed in the hermetically-sealed enclosure and provide communication between the inside and outside, wherein an injection nozzle is disposed at the gas injection port and a suction nozzle is disposed at the gas expulsion port.Type: GrantFiled: October 22, 2010Date of Patent: December 1, 2015Assignee: HGST Netherlands B.V.Inventors: Kyo Akagi, Satoshi Hashimoto, Kensuke Ishiwata
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Patent number: 8976484Abstract: The embodiments of the present invention relate to a shingled magnetic recording system having a magnetic recording medium that has a magnetization easy axis in the recording layer of the medium that is oriented in from the bottom surface to the top surface of the recording layer. Additionally, a magnetization easy axis in the recording layer of the medium is inclined with respect to the recording track width direction.Type: GrantFiled: October 24, 2013Date of Patent: March 10, 2015Assignee: HGST Netherlands B.V.Inventors: Kyo Akagi, Takayuki Ichihara, Masafumi Mochizuki, Hiroyasu Tanabe
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Patent number: 8861116Abstract: In one embodiment, a method includes spiral writing a DC pattern onto a magnetic disk medium using a writer of a magnetic head while moving the magnetic head in a direction about parallel to a radial direction of the magnetic disk medium while rotating the magnetic disk medium, reading the magnetic disk medium while moving the magnetic head in the direction about parallel to the radial direction of the magnetic disk medium while rotating the magnetic disk medium, and calculating a track pitch interval between data tracks of the magnetic disk medium based on the reading of the magnetic disk medium. In another embodiment, a magnetic disk medium includes a DC spiral pattern in a radial region further outward and/or a radial region further inward than a radial region where data is recorded.Type: GrantFiled: August 2, 2011Date of Patent: October 14, 2014Assignee: HGST Netherlands B.V.Inventors: Mao Nishiyama, Masafumi Mochizuki, Kyo Akagi, Shuji Nishida, Kazunari Usui
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Patent number: 8797672Abstract: SMR disk drives are described that adjust track pitch or magnetic write width to compensate for external temperature effects. In one embodiment track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined from the drives' temperature sensor. In other embodiments track pitch is adjusted based on the magnetic write width (MWW) which is determined from read-back testing of previously written data tracks. In an alternative embodiment, the width of the MWW is adjusted instead of the track pitch. The various factors that affect the MWW that can be used to increase or decrease the MWW, including write current characteristics and when available thermal-assistance parameters.Type: GrantFiled: June 14, 2012Date of Patent: August 5, 2014Assignee: HGST Netherlands B.V.Inventors: Hiroyasu Tanabe, Hideki Zaitsu, Kyo Akagi, Naoto Ito
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Publication number: 20130335856Abstract: SMR disk drives are described that adjust track pitch or magnetic write width to compensate for external temperature effects. In one embodiment track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined from the drives' temperature sensor. In other embodiments track pitch is adjusted based on the magnetic write width (MWW) which is determined from read-back testing of previously written data tracks. In an alternative embodiment, the width of the MWW is adjusted instead of the track pitch. The various factors that affect the MWW that can be used to increase or decrease the MWW, including write current characteristics and when available thermal-assistance parameters.Type: ApplicationFiled: June 14, 2012Publication date: December 19, 2013Inventors: Hiroyasu Tanabe, Hideki Zaitsu, Kyo Akagi, Naoto Ito
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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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Publication number: 20130033778Abstract: In one embodiment, a method includes spiral writing a DC pattern onto a magnetic disk medium using a writer of a magnetic head while moving the magnetic head in a direction about parallel to a radial direction of the magnetic disk medium while rotating the magnetic disk medium, reading the magnetic disk medium while moving the magnetic head in the direction about parallel to the radial direction of the magnetic disk medium while rotating the magnetic disk medium, and calculating a track pitch interval between data tracks of the magnetic disk medium based on the reading of the magnetic disk medium. In another embodiment, a magnetic disk medium includes a DC spiral pattern in a radial region further outward and/or a radial region further inward than a radial region where data is recorded.Type: ApplicationFiled: August 2, 2011Publication date: February 7, 2013Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Mao Nishiyama, Masafumi Mochizuki, Kyo Akagi, Shuji Nishida, Kazunari Usui
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Publication number: 20110094091Abstract: A method for producing a magnetic disk device includes injecting replacement gas into a hermetically-sealed enclosure by means of an injection nozzle while suctioning gas from inside of the hermetically-sealed enclosure by means of a suction nozzle in such a way that the gas pressure inside of the enclosure does not fall below the vapor pressure of the organic compounds present inside of the enclosure, wherein the hermetically-sealed enclosure houses within a magnetic disk for storing data, a magnetic head for writing/reading the data, and an actuator for moving the magnetic head relative to the magnetic disk, and wherein a gas injection port and a gas expulsion port are formed in the hermetically-sealed enclosure and provide communication between the inside and outside, wherein an injection nozzle is disposed at the gas injection port and a suction nozzle is disposed at the gas expulsion port.Type: ApplicationFiled: October 22, 2010Publication date: April 28, 2011Inventors: Kyo Akagi, Satoshi Hashimoto, Kensuke Ishiwata
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Patent number: 7852595Abstract: Embodiments of the present invention relate to a method for manufacturing a magnetic disk unit, the method including a step of writing servo data into the magnetic disk while introducing a low-density gas having a lower density than air into the enclosure. In one embodiment, the magnetic disk unit is comprised of a magnetic disk, a magnetic head, and a voice coil motor which are accommodated in the hermetically sealed enclosure. The enclosure has a gas inlet and a gas outlet, which are provided respectively with filters attached thereto.Type: GrantFiled: October 29, 2008Date of Patent: December 14, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Hiroki Kitahori, Kyo Akagi, Takayuki Honda, Yasuo Kojima
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Publication number: 20090300907Abstract: Embodiments of the present invention provide a method for manufacturing a magnetic disk unit, the method permitting easy and efficient introduction of a low-density gas into the enclosure. According to one embodiment, an enclosure of the magnetic disk unit has a gas inlet and a gas outlet, each of which is provided with a filter. When the enclosure is filled with helium, the mass flow rate of helium being supplied to the gas inlet is detected and the mass flow rate of helium being supplied to the gas inlet is controlled according to the thus detected mass flow rate of helium.Type: ApplicationFiled: November 26, 2008Publication date: December 10, 2009Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kyo Akagi, Kensuke Ishiwata, Takashi Kouno, Atsushi Takeichi, Kenji Kuroki, Toshihiko Iwaisako
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Publication number: 20090135517Abstract: Embodiments of the present invention relate to a method for manufacturing a magnetic disk unit, the method including a step of writing servo data into the magnetic disk while introducing a low-density gas having a lower density than air into the enclosure. In one embodiment, the magnetic disk unit is comprised of a magnetic disk, a magnetic head, and a voice coil motor which are accommodated in the hermetically sealed enclosure. The enclosure has a gas inlet and a gas outlet, which are provided respectively with filters attached thereto.Type: ApplicationFiled: October 29, 2008Publication date: May 28, 2009Inventors: Hiroki Kitahori, Kyo Akagi, Takayuki Honda, Yasuo Kojima
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Patent number: 7532426Abstract: Embodiments in accordance with the present invention erase a desired area on a recording surface of disk or disk drive apparatus. According to an embodiment, a hard disk drive (HDD) performs erase on a recording surface by moving a head element unit at one-half a servo track pitch with reference to a servo address. Before actual erase is started on the recording surface, the HDD generates a management table configured based on servo addresses from a management table configured based on data tracks. At an erase process, the HDD sets parameters in accordance with the zone and skips a management area with reference to this management table based on the servo addresses.Type: GrantFiled: April 10, 2007Date of Patent: May 12, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takahiro Nakagawa, Toshiaki Satoh, Hiroshi Fukuyama, Kyo Akagi
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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: 20070258162Abstract: Embodiments in accordance with the present invention erase a desired area on a recording surface of disk or disk drive apparatus. According to an embodiment, a hard disk drive (HDD) performs erase on a recording surface by moving a head element unit at one-half a servo track pitch with reference to a servo address. Before actual erase is started on the recording surface, the HDD generates a management table configured based on servo addresses from a management table configured based on data tracks. At an erase process, the HDD sets parameters in accordance with the zone and skips a management area with reference to this management table based on the servo addresses.Type: ApplicationFiled: April 10, 2007Publication date: November 8, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takahiro Nakagawa, Toshiaki Satoh, Hiroshi Fukuyama, Kyo Akagi
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Publication number: 20070247741Abstract: In an embodiment of the present invention, with Self Servo Write (SSW), a head slider is used to perform AC erase to a recording surface of a magnetic disk. The AC erase is performed asynchronously to every track. A frequency for use with AC erase, i.e., a frequency of an AC erase pattern is three times or higher than a burst frequency of a product servo pattern or a burst frequency of a radial pattern. By satisfying such requirements, for the magnetic disk of vertical magnetic recording, it becomes possible to substantially stop adversely affecting pattern reading in an AC erase area.Type: ApplicationFiled: April 20, 2007Publication date: October 25, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kyo Akagi, Takehiko Hamaguchi, Atsushi Takeichi
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Patent number: 7184236Abstract: A hard disk drive and magnetic medium including a servo area, a data area divided into a plurality of sector blocks and at least one micro-servo area disposed between two sector blocks. There may be a micro-servo area immediately preceding each of the plurality of sector blocks. The micro-servo areas include an address mark and a track parity check code that allow the detection of an external shock that causes the recording (write) head to skip to an adjacent track in the hard disk medium. The micro-servo area is smaller than the servo areas, and various numbers of different track parity check codes can be used for different resolution of shock detection. An acceleration sensor may also be provided to detect larger external shocks. By detecting various external shocks with improved accuracy, and aborting the recording operation of data if an external shock is detected, the corruption of data in adjacent tracks is substantially reduced to improve disk drive performance.Type: GrantFiled: September 21, 2004Date of Patent: February 27, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Takehiko Hamaguchi, Kyo Akagi, Hisashi Takano, Takayuki Ichihara
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Patent number: 7159303Abstract: The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.Type: GrantFiled: March 9, 2006Date of Patent: January 9, 2007Assignee: Hitachi Global Storage Technologies, Ltd.Inventors: Ryoichi Nakatani, Masahiro Kitada, Naoki Koyama, Isamu Yuito, Hisashi Takano, Eijin Moriwaki, Mikio Suzuki, Masaaki Futamoto, Fumio Kugiya, Yoshibumi Matsuda, Kazuo Shiiki, Yoshinori Miyamura, Kyo Akagi, Takeshi Nakao, Hirotsugu Fukuoka, Takayuki Munemoto, Tokuho Takagaki, Toshio Kobayashi, Hideo Tanabe, Noboru Shimizu
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Patent number: 7116508Abstract: A magnetic disk apparatus has: a magnetic disk having a magnetic film formed on a substrate; a spindle motor for rotating the magnetic disk; a magnetic head for writing/reading information on/from the magnetic disk; a supporting member for supporting the magnetic head; a driving mechanism for moving the magnetic head to a predetermined position on the magnetic disk; a magnetic writing/reading circuit for enabling the magnetic head to write/read information on/from the magnetic disk; an interface for sending/receiving signals for controlling the information to/from another information processing device, a device for detecting whether or not the magnetic disk apparatus is in operation; and mechanism for latching movable part of the magnetic disk apparatus on the basis of detection result of the detecting device.Type: GrantFiled: January 28, 2005Date of Patent: October 3, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Kyo Akagi, Takashi Yamaguchi, Koki Uefune, Motoyasu Tsunoda, Atsushi Saito
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Publication number: 20060152862Abstract: The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.Type: ApplicationFiled: March 9, 2006Publication date: July 13, 2006Inventors: Ryoichi Nakatani, Masahiro Kitada, Naoki Koyama, Isamu Yuito, Hisashi Takano, Eijin Moriwaki, Mikio Suzuki, Masaaki Futamoto, Fumio Kugiya, Yoshibumi Matsuda, Kazuo Shiiki, Yoshinori Miyamura, Kyo Akagi, Takeshi Nakao, Hirotsugu Fukuoka, Takayuki Munemoto, Tokuho Takagaki, Toshio Kobayashi, Hideo Tanabe, Noboru Shimizu
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Patent number: 7054120Abstract: The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.Type: GrantFiled: November 5, 2003Date of Patent: May 30, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Ryoichi Nakatani, Masahiro Kitada, Naoki Koyama, Isamu Yuito, Hisashi Takano, Eijin Moriwaki, Mikio Suzuki, Masaaki Futamoto, Fumio Kugiya, Yoshibumi Matsuda, Kazuo Shiiki, Yoshinori Miyamura, Kyo Akagi, Takeshi Nakao, Hirotsugu Fukuoka, Takayuki Munemoto, Tokuho Takagaki, Toshio Kobayashi, Hideo Tanabe, Noboru Shimizu