Patents by Inventor Nobumasa Nishiyama
Nobumasa Nishiyama 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: 7804663Abstract: A micro-electromechanical signal transmission line is made from an electrically conductive material. It has a first distal end and a second distal end. The second distal end is free to move with respect to said first distal end. There exists an unsupported region between the first distal end and the second distal end. The unsupported region is juxtaposed at a controlled distance from at least one grounded conductive surface.Type: GrantFiled: December 20, 2006Date of Patent: September 28, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Toshiki Hirano, Nobumasa Nishiyama, Haruhide Takahashi
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Patent number: 7724475Abstract: Embodiments of the present invention provide a conductive member, in which electric characteristics can be improved by matching impedance all the way from a conductive wire to a pad. In one embodiment, a conductive member comprises: a back side metal layer; an insulating layer formed on the back side metal layer; a conductive wire formed on the insulating layer; and a pad formed on the insulating layer and electrically connected to the conductive wire; at least one opening and at least one supporting structure being formed at a position corresponding to the pad on the back side metal layer.Type: GrantFiled: February 3, 2006Date of Patent: May 25, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Nobumasa Nishiyama
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Patent number: 7684153Abstract: Crosstalk from a write signal on wiring on a suspension needs to be reduced since an ESD withstand voltage is decreased due to high sensitivity of a GMR head. In one embodiment, a terminal arrangement on an element-forming surface of a magnetic head slider consists of a ground terminal G, a read terminal R+, a read terminal R?, a write terminal W+ and a write terminal W? in order from the outside. With this terminal arrangement, the wiring order on a suspension consists of a read wire R?, a read wire R+, a ground line G, a write wire W? and a write wire W+ in an arrangement unlike the terminal arrangement. In other words, the ground line G is interposed between the write wires W and the read wires R.Type: GrantFiled: May 23, 2006Date of Patent: March 23, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Takayoshi Ohtsu, Nobumasa Nishiyama
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Publication number: 20100053812Abstract: According to one embodiment, a magnetic head for recording magnetic data by changing the magnetization direction of a magnetic recording layer of a magnetic medium comprises a magnetic pole for generating a magnetic field to change the magnetization direction of the magnetic recording layer, and a facing electrode pair for generating an electromagnetic field and applying energy to the magnetic recording layer to assist the change of the magnetization direction of the magnetic recording layer caused by the magnetic field from the magnetic pole. Other embodiments are also presented.Type: ApplicationFiled: August 26, 2009Publication date: March 4, 2010Inventors: Yoji Maruyama, Nobumasa Nishiyama, Masafumi Mochizuki
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Publication number: 20090135523Abstract: Embodiments of the present invention relate to approaches to effectively let noise on a head slider bonded to a silicon substrate of a microactuator, escape to the ground. A head gimbal assembly (HGA) according to an embodiment of the present invention comprises a microactuator bonded to a gimbal tongue. The microactuator comprises a piezoelectric element and a movable part for moving in response to expansion or contraction of the piezoelectric element. The motion of the movable part causes a head slider to slightly move. The microactuator further comprises a conductive path including an impurity-containing silicon layer formed on the silicon substrate. The conductive path transmits electric charge of the head slider to a suspension. The conductivity of the impurity-containing silicon layer is lower than the one of the silicon substrate so that the noise charge of the head slider may escape to the suspension.Type: ApplicationFiled: November 14, 2008Publication date: May 28, 2009Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Nobumasa Nishiyama, Ryo Yoshida, Haruhide Takahashi, Shinobu Hagiya, Toshiki Hirano
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Patent number: 7489479Abstract: An electrical lead suspension (ELS) having partitioned air slots. The ELS includes a laminate. A first plurality of signal traces and a second plurality of traces are in a first formed layer of the laminate. The second plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of partitioned air slots is in the second formed layer of the laminate. The portion of the ELS having a plurality of partitioned air slots supporting the at least the first plurality of signal traces and the portion of the ELS having a second plurality of partitioned air slots or patterns supporting the second plurality of traces. The supporting of the first plurality of signal traces separate from the second plurality of traces reduces write-to-read cross talk and signal loss.Type: GrantFiled: January 18, 2005Date of Patent: February 10, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satya Prakash Arya, John Thomas Contreras, Klaas Klaassen, Nobumasa Nishiyama
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Patent number: 7440217Abstract: Embodiments of the invention measure a flying height of a recording head. According to one embodiment, in a magnetic circuit comprising a recording head and a magnetic disk, a magnetic resistance changes when a flying height of a recording head fluctuates. A change in an impedance of a recording circuit is measured by making use of a recording current flown in a recording head when recording data indicates a change of a flying height of the recording head during data recording. The measured flying height can be used for stabilizing a recording operation in the magnetic disk device. This method is especially effective in a magnetic disk device based on the perpendicular magnetic recording system because an impedance largely changes in this type of magnetic disk device.Type: GrantFiled: January 19, 2006Date of Patent: October 21, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Hiroyuki Ono, Nobumasa Nishiyama
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Patent number: 7417209Abstract: A system and method for preventing crosstalk noise from being superimposed on a read signal due to noise from a heater line for a slider in a recording disk drive is disclosed. A heater line pair to the slider is not grounded but is in a floating state with respect to an actuator support structure. A heater driver allows a heater current to flow between a positive power supply voltage and a negative power supply voltage. The heater line pair is not grounded, so an impedance is high as viewed from a magnetic disk. Thus, it is possible to effectively suppress a noise transmitted from the magnetic disk and read signal quality is kept from deteriorating due to the crosstalk from the heater line.Type: GrantFiled: February 24, 2006Date of Patent: August 26, 2008Assignee: Hitachi Global Storage Technologies Netherlands BVInventors: John Contreras, Takashi Ikeda, Yumi Nagano, Nobumasa Nishiyama, Toyomi Ohsawa, Mike Suk
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Publication number: 20080151432Abstract: A micro-electromechanical signal transmission line is made from an electrically conductive material. It has a first distal end and a second distal end. The second distal end is free to move with respect to said first distal end. There exists an unsupported region between the first distal end and the second distal end. The unsupported region is juxtaposed at a controlled distance from at least one grounded conductive surface.Type: ApplicationFiled: December 20, 2006Publication date: June 26, 2008Inventors: Toshiki Hirano, Nobumasa Nishiyama, Haruhide Takahashi
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Patent number: 7352535Abstract: A method and apparatus for reducing crosstalk and signal loss in an electrical interconnect is disclosed. The electrical interconnect includes a laminate. A plurality of signal traces and a subsequent plurality of traces are in a first formed layer of the laminate. The subsequent plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of serpentine patterns are in the second formed layer of the laminate. The plurality of serpentine patterns is separated from subsequent patterns. The plurality of serpentine patterns supports the plurality of signal traces and the subsequent plurality of patterns supports the subsequent plurality of traces. The supporting of the plurality of signal traces separate from the subsequent plurality of traces reduces write-to-read crosstalk and signal loss.Type: GrantFiled: January 13, 2005Date of Patent: April 1, 2008Assignee: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Satya Prakash Arya, John Thomas Contreras, Klaas Berend Klaassen, Nobumasa Nishiyama
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Publication number: 20080014467Abstract: For a Tunneling Magnetoresistive (TMR) element, an electrode is used as a magnetic shield or vice versa. This can pose a problem in that noise from a heater source or electromagnetic induction has a direct influence on the TMR element, namely, on a read signal. According to one embodiment of the present invention, however, a thin film head portion has an insulating film, a heater, an electromagnetic shield, a read element, and a write element laminated in this order from the side of a slider. Insulating films isolate the constituent elements above from each other, and a protection film covers the group mentioned above. The heater is a thin film resistive element made of NiCr or the like, and is disposed above the insulating film. The electromagnetic shield is a magnetic film made of permalloy or the like, and covers the heater. The read element comprises a lower shield and electrode, a TMR element, and an upper shield and electrode.Type: ApplicationFiled: April 12, 2007Publication date: January 17, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.Inventors: Takayoshi Ohtsu, Nobumasa Nishiyama
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Patent number: 7319573Abstract: Embodiments of the invention provide a magnetic disk drive which has improved electrical properties owing to a reduction in the loss of transmission line, improved vibration properties owing to a reduction in the stiffness of wiring around the head, and a flat impedance in the transmission line. In one embodiment, a magnetic disk drive comprises a suspension; a magnetic head coupled with the suspension and configured to write and read information to and from a magnetic recording medium; and a transmission line disposed on the suspension to transmit writing and reading information to and from the magnetic head. The transmission line includes a writing line and a reading line, a lower conductor disposed underneath the writing line and the reading line, and an insulating layer interposed between the lower conductor and the writing and reading lines.Type: GrantFiled: June 16, 2004Date of Patent: January 15, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventor: Nobumasa Nishiyama
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Publication number: 20070247744Abstract: Embodiments in accordance with the present invention reduce the structural stress applied to a head, and to achieve the effective control, when the clearance between the head and a disk is adjusted by using a heater. According to one embodiment, the hard disk controller/microprocessing unit (HDC/MPU) controls a slew rate of a heater at the time of TFC (Thermal Fly height Control). In response to processing conditions, a HDC/MPU changes a slew rate of the output of electric current/voltage applied to the heater. This makes it possible to reduce the head stress, and to achieve the effective TFC. To be more specific, with reference to a temperature/slew rate table, the HDC/MPU changes a slew rate in response to the temperature in the read/write processing.Type: ApplicationFiled: April 24, 2007Publication date: October 25, 2007Inventors: Noriaki Satoh, Toyomi Ohsawa, Yumi Nagano, Nobumasa Nishiyama
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Publication number: 20070230059Abstract: Embodiments in accordance with the present invention disclose hole sequences that are formed in the metal layer of a trace to adjust rigidity and crosstalk noise resulting from the hole sequences is thereby suppressed. A suspension according to one aspect of the invention includes a trace adapted to transmit a signal of a head slider. The trace partially extends along the side surface of the suspension. The trace includes a metal layer, a plurality of transmission lines formed above the metal layer and an insulating layer. A hole sequence overlapping the transmission lines is formed in part of the metal layer, which contributes to a reduction in transmission loss. Another hole sequence of the metal layer is formed at a position opposed to the hinge portion of the suspension. This reduces the rigidity of the wiring structure portion in the hinge portion, thereby preventing interference with the behavior of the suspension at the hinge portion.Type: ApplicationFiled: March 21, 2007Publication date: October 4, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Ryohei Ota, Eiji Soga, Nobumasa Nishiyama, Hiroyasu Tsuchida
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Publication number: 20070210070Abstract: A system and method for preventing crosstalk noise from being superimposed on a read signal due to noise from a heater line for a slider in a recording disk drive is disclosed. A heater line pair to the slider is not grounded but is in a floating state with respect to an actuator support structure. A heater driver allows a heater current to flow between a positive power supply voltage and a negative power supply voltage. The heater line pair is not grounded, so an impedance is high as viewed from a magnetic disk. Thus, it is possible to effectively suppress a noise transmitted from the magnetic disk and read signal quality is kept from deteriorating due to the crosstalk from the heater line.Type: ApplicationFiled: February 24, 2006Publication date: September 13, 2007Inventors: John Contreras, Takashi Ikeda, Yumi Nagano, Nobumasa Nishiyama, Toyomi Ohsawa, Mike Suk
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Publication number: 20060268459Abstract: Crosstalk from a write signal on wiring on a suspension needs to be reduced since an ESD withstand voltage is decreased due to high sensitivity of a GMR head. In one embodiment, a terminal arrangement on an element-forming surface of a magnetic head slider consists of a ground terminal G, a read terminal R+, a read terminal R?, a write terminal W+ and a write terminal W? in order from the outside. With this terminal arrangement, the wiring order on a suspension consists of a read wire R?, a read wire R+, a ground line G, a write wire W? and a write wire W+ in an arrangement unlike the terminal arrangement. In other words, the ground line G is interposed between the write wires W and the read wires R.Type: ApplicationFiled: May 23, 2006Publication date: November 30, 2006Applicant: Hitachi Global Storage Technologies Netherlands B. V.Inventors: Takayoshi Ohtsu, Nobumasa Nishiyama
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Publication number: 20060175080Abstract: Embodiments of the present invention provide a conductive member, in which electric characteristics can be improved by matching impedance all the way from a conductive wire to a pad. In one embodiment, a conductive member comprises: a back side metal layer; an insulating layer formed on the back side metal layer; a conductive wire formed on the insulating layer; and a pad formed on the insulating layer and electrically connected to the conductive wire; at least one opening and at least one supporting structure being formed at a position corresponding to the pad on the back side metal layer.Type: ApplicationFiled: February 3, 2006Publication date: August 10, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Nobumasa Nishiyama
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Publication number: 20060158785Abstract: An electrical lead suspension (ELS) having partitioned air slots. The ELS includes a laminate. A first plurality of signal traces and a second plurality of traces are in a first formed layer of the laminate. The second plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of partitioned air slots is in the second formed layer of the laminate. The portion of the ELS having a plurality of partitioned air slots supporting the at least the first plurality of signal traces and the portion of the ELS having a second plurality of partitioned air slots or patterns supporting the second plurality of traces. The supporting of the first plurality of signal traces separate from the second plurality of traces reduces write-to-read cross talk and signal loss.Type: ApplicationFiled: January 18, 2005Publication date: July 20, 2006Inventors: Satya Arya, John Contreras, Klaas Klaassen, Nobumasa Nishiyama
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Publication number: 20060158769Abstract: Embodiments of the invention measure a flying height of a recording head. According to one embodiment, in a magnetic circuit comprising a recording head and a magnetic disk, a magnetic resistance changes when a flying height of a recording head fluctuates. A change in an impedance of a recording circuit is measured by making use of a recording current flown in a recording head when recording data indicates a change of a flying height of the recording head during data recording. The measured flying height can be used for stabilizing a recording operation in the magnetic disk device. This method is especially effective in a magnetic disk device based on the perpendicular magnetic recording system because an impedance largely changes in this type of magnetic disk device.Type: ApplicationFiled: January 19, 2006Publication date: July 20, 2006Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Hiroyuki Ono, Nobumasa Nishiyama
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Publication number: 20060152854Abstract: A method and apparatus for reducing crosstalk and signal loss in an electrical interconnect is disclosed. The electrical interconnect includes a laminate. A plurality of signal traces and a subsequent plurality of traces are in a first formed layer of the laminate. The subsequent plurality of traces may be signal traces or power traces. The laminate has a dielectric layer between the first formed layer and a second formed layer. A plurality of serpentine patterns are in the second formed layer of the laminate. The plurality of serpentine patterns is separated from subsequent patterns. The plurality of serpentine patterns supports the plurality of signal traces and the subsequent plurality of patterns supports the subsequent plurality of traces. The supporting of the plurality of signal traces separate from the subsequent plurality of traces reduces write-to-read crosstalk and signal loss.Type: ApplicationFiled: January 13, 2005Publication date: July 13, 2006Inventors: Satya Arya, John Contreras, Klaas Klaassen, Nobumasa Nishiyama