Patents by Inventor Masayuki Kurita

Masayuki Kurita 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).

  • Patent number: 9484048
    Abstract: According to one embodiment, a magnetic head includes a write element, a read element, and a heating element disposed between the write element and the read element. When power is applied to the heating element, either the read element or the write element projects beyond a plane of an air-bearing surface (ABS) of the magnetic head, and when power is not applied to the heating element, a portion of the ABS of the magnetic head facing a magnetic disk close to the heating element has a concave shape. In another embodiment, when power is applied to the heating element, at least one of a portion of the read element and a portion of the write element approaches a magnetic disk, and when power is not applied to the heating element, a portion of the ABS of the magnetic head facing a magnetic disk close to the heating element has a concave shape.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: November 1, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Shinji Sasaki, Takateru Seki, Masayuki Kurita, Toshiya Shiramatsu
  • Patent number: 8773801
    Abstract: A magnetic-recording head with a first thermal fly-height control (TFC) element and an embedded contact sensor element (ECSE) configurable as a second TFC element. The magnetic-recording head includes a write element, a read element, a first heater element, and an ECSE. The write element is configured for writing data to a magnetic-recording disk. The read element is configured for reading data from the magnetic-recording disk. The first heater element is configured as a first TFC element to coarsely adjust a fly-height of the magnetic-recording head with respect to the magnetic recording disk. The ECSE is configured to detect a contact with the magnetic-recording disk, and to function as a second heater element that is configured as a second TFC element to finely adjust the fly-height. The first heater element is configured with a first stroke-length larger than a second stroke-length of the second heater element for adjusting the fly-height.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: July 8, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Kenji Kuroki, Yuki Shimizu
  • Patent number: 8767338
    Abstract: A magnetic head slider is disclosed. The magnetic head slider includes a slider substrate and a laminated magnetic head element on the slider substrate. Additionally, the laminated magnetic head element includes a magnetoresistance effect element and a recording magnetic pole formed in a layer higher than the magnetoresistance effect element. A first thin-film resistor heater element is formed in a position further from an air bearing surface than the magnetoresistance effect element and the magnetic recording pole and a second film resistor heater element is formed in a layer lower than the first thin-film resistor heater element, and closer to the air bearing surface and the magnetoresistance effect element than the first heater element. A thin-film resistor sensor element is formed in a layer higher than the second thin-film heater element and closer to the air bearing surface than the second heater element.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: July 1, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Toshiya Shiramatsu, Masayuki Kurita, Hidekazu Kohira
  • Patent number: 8711508
    Abstract: A HDD including a magnetic disk, a magnetic head, an embedded contact sensor embedded in the magnetic head and configured to detect a contact between the magnetic disk and the magnetic head, and TFC embedded in the magnetic head and configured to facilitate in detecting the contact between the magnetic disk and said magnetic head.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: April 29, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Yuki Shimizu
  • Patent number: 8593749
    Abstract: A hard-disk drive. The hard-disk drive includes a head-slider configured to fly in proximity with a recording surface of a magnetic-recording disk, and a fly-height variation compensator configured to generate a signal for compensating variation in fly height of a write element of the head-slider. The head-slider further includes the write element configured to write data to the magnetic-recording disk, a fly-height-adjustment heating element configured to displace the write element towards the magnetic-recording disk, and a position-adjustment heating element configured to displace the write element in at least a direction perpendicular to a flying direction. The fly-height variation compensator is further configured to add the signal for compensating variation in fly height to a control signal for output to the fly-height-adjustment heating element.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: November 26, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Takenori Atsumi, Irizo Naniwa, Toshiya Shiramatsu, Masayuki Kurita
  • Patent number: 8300337
    Abstract: A method for measuring change of clearance between a head and a disk. The method includes reading a preliminarily written data string for clearance measurement on a disk to obtain a first measured value corresponding to a clearance, and writing a new data string for deterioration check onto the disk and reading the data string for deterioration check to obtain a second measured value corresponding to the clearance. The method also includes determining a deterioration of the data string for clearance measurement from a difference between the first measured value and the second measured value, measuring a clearance change using the data string for clearance measurement by a normal operation if the determination is that the data string for clearance measurement has not deteriorated, and measuring a clearance change by an operation different from the normal operation if the determination is that the data string for clearance measurement has deteriorated.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: October 30, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Masayuki Kurita, Kenji Kuroki, Kenichi Kuramoto, Yoshihiko Maeda
  • Patent number: 8259406
    Abstract: A disk drive including a sensor element that senses contact between a head slider and a disk, a head integrated circuit (IC) comprising an amplification circuit section that amplifies a signal of the head slider, a controller IC comprising a controller that accesses a register of the head IC for controlling the head IC, and an identification section, within the head IC, that determines a contact frequency of the contact by the sensor element by using a timing control signal of the controller IC.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: September 4, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Michiya Kazusawa, Masayuki Kurita, Kenji Kuroki, Yoshihiko Maeda
  • Patent number: 8218405
    Abstract: Embodiments of the present invention provide a technique for projecting both a write element portion in writing and a read element portion in reading, and controlling a projecting distance of each write element and read element. According to one embodiment, a light absorbing member and a thermally expanding member are formed near a read element, and light is irradiated to the light absorbing member, thereby a read element is projected. Alternatively, light absorbing members, which absorb light having different wavelengths from each other, and thermally expanding members are formed near a write element and near the read element respectively, and a wavelength or intensity of light to be irradiated is changed, thereby a projecting distance of each of the write element and the read element is individually optionally controlled.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: July 10, 2012
    Assignee: HGST Netherlands B.V.
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Irizo Naniwa
  • Publication number: 20120120521
    Abstract: A HDD including a magnetic disk, a magnetic head, an embedded contact sensor embedded in the magnetic head and configured to detect a contact between the magnetic disk and the magnetic head, and TFC embedded in the magnetic head and configured to facilitate in detecting the contact between the magnetic disk and said magnetic head.
    Type: Application
    Filed: November 17, 2010
    Publication date: May 17, 2012
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Yuki Shimizu
  • Publication number: 20120099218
    Abstract: A magnetic-recording head with a first thermal fly-height control (TFC) element and an embedded contact sensor element (ECSE) configurable as a second TFC element. The magnetic-recording head includes a write element, a read element, a first heater element, and an ECSE. The write element is configured for writing data to a magnetic-recording disk. The read element is configured for reading data from the magnetic-recording disk. The first heater element is configured as a first TFC element to coarsely adjust a fly-height of the magnetic-recording head with respect to the magnetic recording disk. The ECSE is configured to detect a contact with the magnetic-recording disk, and to function as a second heater element that is configured as a second TFC element to finely adjust the fly-height. The first heater element is configured with a first stroke-length larger than a second stroke-length of the second heater element for adjusting the fly-height.
    Type: Application
    Filed: October 21, 2010
    Publication date: April 26, 2012
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Kenji Kuroki, Yuki Shimizu
  • Patent number: 8125728
    Abstract: A disk drive. The disk drive includes a disk, a head-slider, a moving mechanism, and a controller. The head-slider includes a read/write element, a first heater element, a contact pad, and a second heater element. The read/write element includes a read element configured to read user data from the disk, and a write element configured to write user data to the disk. The moving mechanism is configured to support and to move the head-slider. The controller is configured to control the second heater element to control contact between the contact pad and the disk, and is configured to control clearance between the read/write element and the disk by using the first heater element with the contact pad in contact with the disk.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: February 28, 2012
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Hidekazu Kohira, Kenji Kuroki
  • Publication number: 20110149430
    Abstract: A magnetic head slider is disclosed. The magnetic head slider includes a slider substrate and a laminated magnetic head element on the slider substrate. Additionally, the laminated magnetic head element includes a magnetoresistance effect element and a recording magnetic pole formed in a layer higher than the magnetoresistance effect element. A first thin-film resistor heater element is formed in a position further from an air bearing surface than the magnetoresistance effect element and the magnetic recording pole and a second film resistor heater element is formed in a layer lower than the first thin-film resistor heater element, and closer to the air bearing surface and the magnetoresistance effect element than the first heater element. A thin-film resistor sensor element is formed in a layer higher than the second thin-film heater element and closer to the air bearing surface than the second heater element.
    Type: Application
    Filed: December 20, 2010
    Publication date: June 23, 2011
    Inventors: Toshiya Shiramatsu, Masayuki Kurita, Hidekazu Kohira
  • Publication number: 20110141603
    Abstract: A disk drive including a sensor element that senses contact between a head slider and a disk, a head integrated circuit (IC) comprising an amplification circuit section that amplifies a signal of the head slider, a controller IC comprising a controller that accesses a register of the head IC for controlling the head IC, and an identification section, within the head IC, that determines a contact frequency of the contact by the sensor element by using a timing control signal of the controller IC.
    Type: Application
    Filed: December 9, 2010
    Publication date: June 16, 2011
    Inventors: Michiya KAZUSAWA, Masayuki Kurita, Kenji Kuroki, Yoshihiko Maeda
  • Publication number: 20110102933
    Abstract: A method for measuring a change of a clearance between a head and a disk. The method includes reading a preliminarily written data string for clearance measurement on a disk to obtain a first measured value corresponding to a clearance, and writing a new data string for deterioration check onto the disk and reading the data string for deterioration check to obtain a second measured value corresponding to the clearance. The method also includes determining a deterioration of the data string for clearance measurement from a difference between the first measured value and the second measured value, measuring a clearance change using the data string for clearance measurement by a normal operation if the determination is that the data string for clearance measurement has not deteriorated, and measuring a clearance change by an operation different operation if the determination is that the data string for clearance measurement has deteriorated.
    Type: Application
    Filed: September 11, 2009
    Publication date: May 5, 2011
    Inventors: Masayuki Kurita, Kenji Kuroki, Kenichi Kuramoto, Yoshihiko Maeda
  • Publication number: 20110080671
    Abstract: A hard-disk drive. The hard-disk drive includes a head-slider configured to fly in proximity with a recording surface of a magnetic-recording disk, and a fly-height variation compensator configured to generate a signal for compensating variation in fly height of a write element of the head-slider. The head-slider further includes the write element configured to write data to the magnetic-recording disk, a fly-height-adjustment heating element configured to displace the write element towards the magnetic-recording disk, and a position-adjustment heating element configured to displace the write element in at least a direction perpendicular to a flying direction. The fly-height variation compensator is further configured to add the signal for compensating variation in fly height to a control signal for output to the fly-height-adjustment heating element.
    Type: Application
    Filed: December 10, 2009
    Publication date: April 7, 2011
    Inventors: Takenori ATSUMI, Irizo Naniwa, Toshiya Shiramatsu, Masayuki Kurita
  • Publication number: 20110069408
    Abstract: A disk drive. The disk drive includes a disk, a head-slider, a moving mechanism, and a controller. The head-slider includes a read/write element, a first heater element, a contact pad, and a second heater element. The read/write element includes a read element configured to read user data from the disk, and a write element configured to write user data to the disk. The moving mechanism is configured to support and to move the head-slider. The controller is configured to control the second heater element to control contact between the contact pad and the disk, and is configured to control clearance between the read/write element and the disk by using the first heater element with the contact pad in contact with the disk.
    Type: Application
    Filed: November 25, 2009
    Publication date: March 24, 2011
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Hidekazu Kohira, Kenji Kuroki
  • Patent number: 7911738
    Abstract: According to embodiments of the present invention, a magnetic head slider provided with a heater disposed near a read element to adjust flying height, is required to increase a thermal protrusion by heat generated by the heater without increasing a thermal protrusion attributable to heat generated by a recording current or environmental temperature. A magnetic head slider includes a thin-film head unit including a read element, a heater having a thin heating line extended above and below the read element, a write element, and an insulating layer of alumina (Al2O3) or the like insulating those components. The thin heating line of the heater is formed from a thin resistive film of NiCr or the like. The thin heating line of the heater is extended above and below the read element so as to meander in a zigzag shape in a direction perpendicular to the device forming surface. The thin heating line has a thickness between about 0.1 and 0.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: March 22, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Masayuki Kurita, Toshiya Shiramatsu, Masanori Tanabe, Takayoshi Ohtsu
  • Patent number: 7894149
    Abstract: Embodiments of the present invention precisely measure clearance variation by temperature change using a value in a RW channel. In an embodiment of the present invention, an HDD measures resolution by signals in a RW channel. The measured resolution shows variations depending on temperature according to two factors. One factor is the clearance variation depending on the temperature and the other is the variation in operational property of the RW channel depending on the temperature. The HDD compensates for the temperature variation of the resolution according to the two factors. The HDD uses two kinds of sensed temperature. One corresponds to the temperature inside an enclosure in which head sliders are provided and the other corresponds to the temperature of the chip in which the RW channel is implemented. Sensing the drive temperature and the channel temperature independently achieves precise compensation for the variation in the measured resolution caused by clearance variation and channel property.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: February 22, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands, B.V.
    Inventors: Hiroyasu Masuda, Yoshihiko Maeda, Kenichi Kuramoto, Masayuki Kurita, Kenji Kuroki
  • Patent number: 7864474
    Abstract: Embodiments in accordance with the present invention reduce the number of errors caused by the aged deterioration of a heater for adjusting the clearance between a head and a disk. According to one embodiment, a thermal fly height control (TFC) controller executes the measurement of a resistance value of a heater in a predetermined timing. The TFC controller judges whether or not the measured resistance value falls within a predetermined reference range. If the measured resistance value falls within the reference range, the processing ends without performing any other processing. If the measured resistance value goes out of the reference range, the TFC controller executes error handling processing in response to a resistance failure. As one of the error handling processing, the TFC controller notifies the host that the abnormality (resistance failure) has been detected in the resistance value of the TFC heater.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: January 4, 2011
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Noriaki Satoh, Toyomi Ohsawa, Yumi Nagano, Kouji Miyake, Yoshiaki Uji, Masayuki Kurita
  • Patent number: 7788795
    Abstract: A method for manufacturing a magnetic head that is effective for the suppression of thermal protrusion. The magnetic head includes SiO2, Si nitride, or Si oxide as a coil insulator having a low coefficient of thermal expansion and high workability. The coil insulator is arranged at a position away from the air bearing surface and the air bearing surface is made of alumina, making slider processing easy.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: September 7, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kimitoshi Etoh, Hisako Takei, Masayuki Kurita, Yuji Kumazawa