Patents by Inventor Hiroshi Iwai

Hiroshi Iwai 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).

  • Adaptive control apparatus using multiple adaptive control methods
    Patent number: 8457582
    Abstract: In the adaptive control apparatus, a computation unit computes weighting coefficients, using a first adaptive control method in a proportion ? of a first computation amount, where the first adaptive control method has a first convergence rate and a first convergence error. Further, a computation unit computes weighting coefficients from initial values of the weighting coefficients computed by the computation unit, using a second adaptive control method in a proportion (1??) of a second computation amount, where the second adaptive control method has a second convergence rate slower than the first convergence rate and a second convergence error smaller than the first convergence error. A controller controls determination of a ratio ?/(1-?) based on a moving speed of a mobile unit, and controls the computation units to perform computing processes.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: June 4, 2013
    Assignee: Panasonic Corporation
    Inventors: Atsushi Yamamoto, Koichi Ogawa, Hiroshi Iwai, Yoshio Koyanagi, Akira Kato
  • Disk drive device having a vibration-reducing element
    Patent number: 8451557
    Abstract: In a disk drive device, a magnetic recording disk is to be mounted on a hub. A base plate rotatably supports the hub through a bearing unit. A projecting portion is formed on the upper surface of the base plate having a cylindrical side surface centered along the rotational axis of the motor. A laminated core is formed by laminating magnetic steel sheets and has a ring portion and a plurality of teeth radially extending from the ring portion. The disk drive device has a tubular vibration-deadening ring. The outer surface of the vibration-deadening ring is press-fitted into the ring portion at least at a position, along the motor's rotational axis, closer to the upper surface than to the lower surface of the laminated core; and the inner surface of the vibration-deadening ring is fixed to the side surface of the projecting portion.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: May 28, 2013
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Kazuyoshi Nagai, Hiroshi Iwai
  • Disk drive device with appropriate number of combinations of magnetic poles and salient poles to reduce thickness of the disk drive device
    Patent number: 8451558
    Abstract: A disk drive device includes: a base member; a hub on which a recording disk is placed; a bearing unit arranged on the base member for rotatably supporting the hub; and a spindle drive unit for rotationally driving the hub, wherein the spindle drive unit includes a stator core having salient poles, a coil wound around each of the salient poles, and a magnet having a plurality of magnetic poles arranged in a circumferential direction opposed to the salient poles, the hub includes an outer cylindrical portion formed of a magnetic material and engaged with an inner periphery of the recording disk, and an inner cylindrical portion fixing an outer periphery of the magnet, the number of magnetic poles is an even number in a range of 10 to 16, and the number of salient poles is a multiple of 3 in a range of 12 to 24.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: May 28, 2013
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Takanori Watanabe, Mitsuo Kodama, Hiroshi Iwai, Akira Nishio
  • Disk drive device with motor coil wiring arrangement to reduce thickness and suppressed torque decrease
    Patent number: 8395862
    Abstract: The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The base member having a wire hole through which a wire from the coil passes, and a concavity that is formed at a bottom surface of the base member wherein the wire passes through the wire hole along a bottom face of the base member to a wiring member at the concavity.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: March 12, 2013
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Takanori Watanabe, Hiroshi Iwai, Tomoyuki Tashiro
  • Method manufacturing of fluid dynamic bearing using cutting tool that performs micro alternating drive
    Patent number: 8381404
    Abstract: A method manufacturing of a fluid dynamic bearing includes: forming a substantially linear groove having a length corresponding to a circumferential direction width of the dynamic pressure groove formed on the inner circumferential surface of a shaft housing hole portion, along the circumferential direction of a surface orthogonal to a first processing direction along the central axis direction of a work, by a byte that performs a micro alternating drive in a second processing direction orthogonal to the first processing direction; and extending the dynamic pressure groove that extends in the first processing direction by continuously forming the substantially linear grooves in the first processing direction by displacing the relative positions of the work and the byte in the first processing direction.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: February 26, 2013
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Hisayuki Aoshima, Hiroshi Iwai
  • Manufacturing method of disk drive device capable of reducing amount of unbalance, disk drive device and subassembly thereof
    Patent number: 8358484
    Abstract: A disk drive device is provided with a recording disk, a base member, a bearing unit, and a hub member. In a marking step, unbalance information indicating the displacement of the center of gravity of the hub member with respect to the rotation center of the hub member is acquired, and an information mark containing the unbalance information is applied to at least the hub member or the base member. In an installing and adjustment step, the unbalance information is read form the information mark, and the position for installing the recording disk in an outer cylinder part is determined in accordance with the unbalance information so as to install the recording disk on the hub member.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: January 22, 2013
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Kazuyoshi Nagai, Hiroshi Iwai
  • DISK DRIVE DEVICE WITH HUB
    Publication number: 20120262823
    Abstract: The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The diameter of the inner cylinder portion is larger than the diameter of the outer cylinder portion.
    Type: Application
    Filed: June 22, 2012
    Publication date: October 18, 2012
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Takanori WATANABE, Hiroshi IWAI, Tomoyuki TASHIRO
  • Antenna apparatus including multiple antenna portions on one antenna element
    Patent number: 8264414
    Abstract: An antenna apparatus is provided with two feed ports respectively provided at positions on an antenna element, and the antenna element is simultaneously excited through the two feed ports so as to simultaneously operate as two antenna portions respectively associated with the two feed ports. The antenna apparatus is further provided with a slit provided between the two feed ports, for changing a resonant frequency of the antenna element and producing isolation between the feed ports at a isolation frequency, and provided with matching means for shifting an operating frequency of the antenna element from the changed resonant frequency to the isolation frequency.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: September 11, 2012
    Assignee: Panasonic Corporation
    Inventors: Tsutomu Sakata, Atsushi Yamamoto, Hiroshi Iwai, Satoru Amari
  • Disk drive hub with motor coil wiring arrangement to reduce thickness and suppressed torque decrease
    Patent number: 8213114
    Abstract: The disk drive device includes a base member, a hub, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole and a magnet opposed to the salient pole. The hub formed of magnetic material includes an outer cylinder portion engaged with an inner circumference of a recording disk and an inner cylinder portion to which an outer circumference of the magnet is fixed. The diameter of the inner cylinder portion is larger than the diameter of the outer cylinder portion.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: July 3, 2012
    Assignee: Alphana Technology Co., Ltd.
    Inventors: Takanori Watanabe, Hiroshi Iwai, Tomoyuki Tashiro
  • Disk drive device with vibration reduction of second order rocking-mode resonance
    Patent number: 8213113
    Abstract: In a brushless motor, the rotational frequency N (Hz) of the hub satisfies N<F0/(3*P+2), where F0 (Hz) is an Eigen frequency of the second order rocking-mode resonance when not rotating in the situation where the recording disk is mounted on the hub. The recording disk is mounted on the hub. A base plate rotatably supports the hub. A laminated core is fixed to the base. The core has a ring portion and a plurality of teeth that extend radially from the ring portion. Coils are wound around the plurality of teeth. The coils are three-phase driven. A cylindrical magnet is fixed to the hub. The cylindrical magnet are magnetized for driving with P (P is a natural number) poles along the circumferential direction and are arranged to radially face the plurality of teeth.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: July 3, 2012
    Assignee: Alphana Technology Co. Ltd.
    Inventors: Takanori Watanabe, Hiroshi Iwai, Isamu Hashimoto
  • Mobile wireless communication apparatus having a plurality of antenna elements
    Patent number: 8200302
    Abstract: A housing antenna is small enough in size so as to be accommodated in a mobile device. The antenna has a number of feeding points that allow the antenna to operate as a number of antenna elements. The antenna is capable of realizing high speed communication by increasing communication capacity.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: June 12, 2012
    Assignee: Panasonic Corporation
    Inventors: Atsushi Yamamoto, Hiroshi Iwai, Tsutomu Sakata, Yoshio Koyanagi, Toshiteru Hayashi
  • Mobile wireless communication apparatus having a plurality of antenna elements
    Patent number: 8200301
    Abstract: A housing antenna is small enough in size so as to be accommodated in a mobile device. The antenna has a number of feeding points that allow the antenna to operate as a number of antennal elements. The antenna is capable of realizing high-speed communication by increasing communication capacity.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: June 12, 2012
    Assignee: Panasonic Corporation
    Inventors: Atsushi Yamamoto, Hiroshi Iwai, Tsutomu Sakata, Yoshio Koyanagi, Toshiteru Hayashi
  • MIMO antenna apparatus changing antenna elements based on transmission capacity
    Patent number: 8190104
    Abstract: A controller of a MIMO antenna apparatus calculates a current transmission capacity based on signal levels detected by a signal level detector circuit. The controller calculates an estimated transmission capacity assuming that at least one of antenna elements currently connected to a MIMO modulator and demodulator circuit is changed to a further antenna element not connected to the MIMO modulator and demodulator circuit, based on the detected signal levels and degrees of electromagnetic coupling stored in a degree-of-coupling memory. The controller controls a switch circuit to connect the further antenna element to the MIMO modulator and demodulator circuit when the current transmission capacity becomes lower than the estimated transmission capacity.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: May 29, 2012
    Assignee: Panasonic Corporation
    Inventors: Atsushi Yamamoto, Hiroshi Iwai, Tsutomu Sakata, Yoshio Koyanagi, Toshiteru Hayashi
  • Wireless communication apparatus for simultaneously performing multiple wireless communications
    Patent number: 8155599
    Abstract: A portable wireless communication apparatus is provided with antenna elements; a mobile phone signal processing circuit; a DTV tuner for receiving DTV low-band frequency signals and DTV high-band frequency signals; impedance matching circuits for the mobile phone signal processing circuit; and impedance matching circuits for the DTV tuner for receiving the DTV low-band frequency signals and DTV high-band frequency signals. A switch is changed to select either the DTV low-band frequency signals or the DTV high-band frequency signals, and output the selected signals to the DTV tuner. A tuner controller controls the switch to select the DTV high-band frequency signals by using the antenna element for transmission from the mobile phone signal processing circuit.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: April 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Akira Kato, Hiroshi Iwai, Atsushi Yamamoto
  • MIMO antenna apparatus capable of diversity reception using one radiating conductor
    Patent number: 8098756
    Abstract: A MIMO antenna apparatus is provided with: an upper housing having slits; first feed points through which the upper housing itself is excited as first antennas; second feed points through which the slits are excited as second antennas; switch, each of which is connected to one of the first feed points and one of the second feed points, and connects one of the two feed points to an A/D converter circuit-; a signal level detector circuit detecting signal levels of received radio signals; and a controller that controls the switches to change a feed point connected to the A/D converter circuit, when the detected signal level is less than or equal to a predetermined threshold value. The slits are located between the first antennas.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: January 17, 2012
    Assignee: Panasonic Corporation
    Inventors: Atsushi Yamamoto, Hiroshi Iwai, Satoru Amari, Tsutomu Sakata
  • Amplifying circuit with bypass circuit, and electronic device using the same
    Patent number: 8089312
    Abstract: An amplifying circuit with a bypassing function includes an input terminal to which a signal is input from an antenna, an amplifier connected to the input terminal, a first inductor connected between the input port and a ground, and a bypass circuit connected between the input terminal and the output port of the amplifier. The bypass circuit includes a first port connected to the input terminal, a second port connected to the output port of the amplifier, a switch, a capacitor, and a second inductor. The switch is connected in series between the first and second ports. The capacitor is connected in series to the switch between the first and second ports. The second inductor is connected in series to the switch and the capacitor between the first and second ports. Signal power is not reduced drastically even when the signal passes through the bypass circuit.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: January 3, 2012
    Assignee: Panasonic Corporation
    Inventors: Motoyuki Okayama, Hiroshi Iwai, Motohiko Sako, Hidenori Kitamura, Yuta Yamamoto
  • ROTATING DEVICE AND A METHOD FOR MANUFACTURING A ROTATING DEVICE
    Publication number: 20110279925
    Abstract: In a disk drive device, a magnetic recording disk is mounted on a hub. A base rotatably supports the hub via a bearing unit. The base has a ring-shaped wall that surrounds the bearing unit and that protrudes towards the hub. A laminated core is fixed to the base. The laminated core has a ring portion and twelve teeth that radially outwardly extend from the ring portion. Coils are wound around the twelve teeth. The base includes an increasing-thickness portion formed so that the less the distance between a part of the increasing-thickness portion and the ring-shaped wall is, the thicker the part of the increasing-thickness portion becomes.
    Type: Application
    Filed: May 10, 2011
    Publication date: November 17, 2011
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Takanori WATANABE, Takuji YAMADA, Susumu ANDO, Hiroshi IWAI
  • Multi-antenna communication apparatus
    Patent number: 8050639
    Abstract: Reception signals received by first to fourth antennas 11 to 14 are sequentially selected one by one repeatedly in accordance with first to fourth switches 31 to 34 being controlled by first to fourth switch control circuits 41 to 44, respectively, so as to be inputted to a signal shaping section 60. The reception signals having been shaped by the signal shaping section 60 are sampled by a sample-and-hold section 71 and AD-converted by an AD converter 72 in accordance with a time at which the reception signals are sequentially selected. The resultant signals are converted into parallel signals by a serial-parallel conversion section 73. Thus, the parallel signals are obtained as the reception signals of the first to the fourth antennas 11 to 14.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: November 1, 2011
    Assignee: Panasonic Corporation
    Inventors: Toshifumi Nakatani, Hiroshi Iwai
  • DISK DRIVE DEVICE
    Publication number: 20110255191
    Abstract: A disk drive device includes a base member; a hub on which a recording disk is placed; a bearing unit arranged on the base member for rotatably supporting the hub; and a spindle drive unit for rotationally driving the hub, wherein the spindle drive unit includes a stator core having salient poles, a coil wound around each of the salient poles, and a magnet having a plurality of magnetic poles arranged in a circumferential direction opposed to the salient poles, the hub includes an outer cylindrical portion formed of a magnetic material and engaged with an inner periphery of the recording disk, and an inner cylindrical portion fixing an outer periphery of the magnet, the number of magnetic poles is an even number in a range of 10 to 16, and the number of salient poles is a multiple of 3 in a range of 12 to 24.
    Type: Application
    Filed: April 5, 2011
    Publication date: October 20, 2011
    Applicant: ALPHANA TECHNOLOGY CO., LTD.
    Inventors: Takanori WATANABE, Mitsuo KODAMA, Hiroshi IWAI, Akira NISHIO
  • Radio communication apparatus
    Patent number: 8000379
    Abstract: An object of the invention is to stabilize the convergence operation at the automatic impedance matching time and ensure the reception quality in the convergence process in a fading environment in a radio communication apparatus which performs automatic impedance matching between an antenna and a Radio frequency section to decrease the impedance matching loss, for example, when the apparatus is brought close to a human body.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: August 16, 2011
    Assignee: Panasonic Corporation
    Inventors: Takaaki Kishigami, Hiroshi Iwai