Patents by Inventor Takayoshi Ozaki

Takayoshi Ozaki 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: 10397792
    Abstract: A channel assignment apparatus includes an interfered amount processing unit that represents a value group by a symmetric matrix, the value group including, as an element, an amount of interference that occurs in each of wireless access points, performs a row exchange and a column exchange in the symmetric matrix based on magnitude of the amount of interference, and generates one of the upper triangular matrix and the lower triangular matrix from the symmetric matrix in which the row exchange and the column exchange are performed, an assigning unit that assigns a frequency channel to each of the wireless access points by using one of the upper triangular matrix and the lower triangular matrix in accordance with a predetermined algorithm for selecting an optimal assignment candidate corresponding to the magnitude of the amount of interference from among a plurality of assignment candidates for the frequency channel.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: August 27, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Takayoshi Nakayama, Kazuyuki Ozaki, Hiroshi Fujita
  • Patent number: 10339811
    Abstract: A technology for displaying images on a displaying apparatus mounted on a vehicle is provided. In response to a predetermined instruction signal, synthetic images viewed from a virtual viewpoint around and above the periphery of the vehicle are generated based on a plurality of images acquired from a plurality of cameras for capturing the periphery of the vehicle. The plurality of synthetic images, in which a position of a viewpoint moves sequentially varies such that the synthetic images move in a circle around the vehicle, are sequentially output to the displaying apparatus. Accordingly, the user monitors the entire circumference of the vehicle from the viewpoint where the user sees the vehicle in front of user's eyes, so that the user can intuitively recognize the positional relation between the vehicle and an obstacle from one screen.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: July 2, 2019
    Assignee: FUJITSU TEN LIMITED
    Inventors: Yasuhiro Ohno, Yukisuke Ozaki, Takayoshi Yamashita
  • Patent number: 9850906
    Abstract: This centrifugal blood pump apparatus includes an impeller (10) provided in a blood chamber (7), and a plurality of coils (20) provided in a motor chamber (8) for driving the impeller (10) to rotate with a dividing wall (6) interposed therebetween. A flexible substrate (23) in the shape of a strip is arranged to surround outer circumferences of the plurality of coils (20), and is connected to the plurality of coils (20) and a connector (24). A driving voltage (VU, VV, VW) is externally supplied to the plurality of coils (20) via the connector (24) and the flexible substrate (23). Thus, assembling workability, productivity and reliability are improved.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: December 26, 2017
    Assignee: TC1 LLC
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Ken Sugiura, Takehisa Mori, Takeshi Tsubouchi
  • Patent number: 9751409
    Abstract: An electric vehicle includes a motor unit configured to drive a wheel, the motor unit including motor coils; a control system including an inverter; a temperature sensor configured to sense temperature of the motor coils or the inverter; and a limiter configured to, if the temperature sensed by the temperature sensor is equal to or greater than a motor coils temperature threshold, reduce a motor current of the motor unit until a derivative dTmc/dt of the sensed temperature with time drops to zero or below, or to, if the temperature sensed by the temperature sensor is equal to or greater than an inverter temperature threshold, limit a current command to the inverter until a derivative dTic/dt of the sensed temperature with time drops to zero or below. The limiter is further configured to stop reducing a motor current of the motor or limiting the current command to the inverter.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: September 5, 2017
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9724995
    Abstract: In a diagnostic device and a diagnostic method for a motor unit of an electric vehicle, an oil degradation/others detection unit is provided which is configured to detect at least any one detection item of a contamination degree, a degradation degree, and an oil amount of an oil used for cooling a motor unit or a reduction gear unit during a non-traveling period when the vehicle is powered on. An abnormalities-time control unit is provided which is configured to send notice of abnormalities of an oil supply system or not permit start of rotation of the motor unit when a detection value detected by the oil degradation/others detection unit is out of a setting range.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: August 8, 2017
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9638202
    Abstract: A centrifugal blood pump apparatus includes a plurality of permanent magnets (17) in an impeller (10) in a blood chamber (7), a plurality of coils (20) in a motor chamber (8), and a magnetic element (18) in each of the coils (20). The magnetic elements (18) are made shorter than the coils (20) to lower attractive force between the magnetic elements (18) and the permanent magnets (17) in the impeller (10), to set a large gap between the magnetic elements (18) and the permanent magnets (17). As a result, axial attractive force and negative rigidity can be lowered while required torque is satisfied.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: May 2, 2017
    Assignee: TC1 LLC
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Ken Sugiura
  • Patent number: 9615836
    Abstract: A remote-controlled actuator assembly includes a distal end member fitted to a tip end of a spindle guide section for alteration in attitude, a tool rotatably provided in the distal end member, a tool rotation drive source for rotating the tool, and an attitude altering drive mechanism for operating the attitude of the distal end member. The spindle guide section has a rotary shaft for transmitting a rotation of the tool rotation drive source to the spindle and an attitude altering member to alter the attitude of the distal end member. The attitude altering mechanism includes an attitude altering drive source, a reduction unit to reduce a speed of input rotation from the attitude altering drive source, a motion converter mechanism to convert a rotational output from the reduction unit to advancing/retracting motion, and an output member to cause the attitude altering member to advance/retract according to an output of the motion converter mechanism.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: April 11, 2017
    Assignee: NTN CORPORATION
    Inventors: Hiroshi Isobe, Takayoshi Ozaki
  • Patent number: 9550435
    Abstract: An angular acceleration monitor may monitor whether or not an angular acceleration of a wheel detected by an angular acceleration detector is equal to or smaller than an acceptable angular acceleration (W) that is calculated with the following formula: W=k1×R×Tt/m/r2 where k1 is a constant, Tt is a total drive torque that is a sum of drive torques of all motor units that drive wheels of the vehicle, m is vehicle mass, r is tire radius, and R is reduction ratio of a reducer unit interposed between the motor unit and the wheel. A slip-responsive controller causes, if it is determined that the acceptable angular acceleration is exceeded, a motor controller to reduce a drive torque of the motor unit(s).
    Type: Grant
    Filed: November 22, 2012
    Date of Patent: January 24, 2017
    Assignee: NTN CORPORATION
    Inventors: Takayoshi Ozaki, Koichi Okada, Kenichi Suzuki
  • Publication number: 20160281728
    Abstract: A centrifugal blood pump apparatus includes a plurality of permanent magnets (17) in an impeller (10) in a blood chamber (7), a plurality of coils (20) in a motor chamber (8), and a magnetic element (18) in each of the coils (20). The magnetic elements (18) are made shorter than the coils (20) to lower attractive force between the magnetic elements (18) and the permanent magnets (17) in the impeller (10), to set a large gap between the magnetic elements (18) and the permanent magnets (17). As a result, axial attractive force and negative rigidity can be lowered while required torque is satisfied.
    Type: Application
    Filed: June 6, 2016
    Publication date: September 29, 2016
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Ken Sugiura
  • Patent number: 9410549
    Abstract: In this centrifugal blood pump apparatus, one permanent magnet is provided in one surface of an impeller, a second permanent magnet is provided in an inner wall of a blood chamber, a third permanent magnet is provided in the other surface of the impeller, and a fourth permanent magnet and a rotor for driving the impeller to rotate are provided, with an diaphragm being interposed. An amount of change in attractive force between the first permanent magnet and the second permanent magnet and an amount of change in attractive force between the third and fourth permanent magnets when the impeller is eccentric are made substantially equal to each other. Therefore, a levitation position of the impeller can always be maintained at a substantially central position in a housing.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: August 9, 2016
    Assignee: Thoratec Corporation
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Kenichi Suzuki, Ken Sugiura
  • Patent number: 9395389
    Abstract: A sensor assembly is sandwiched together with a rubber material mixed with a vulcanizing agent in a mold assembly including an upper mold and a lower mold. The upper and lower molds, while completely sandwiching the sensor assembly, are heated for a predetermined length of time, and a pressure is then applied to the sensor assembly to complete a compressive molding.
    Type: Grant
    Filed: April 9, 2013
    Date of Patent: July 19, 2016
    Assignee: NTN CORPORATION
    Inventors: Takayoshi Ozaki, Tomomi Ishikawa, Toru Takahashi
  • Patent number: 9382908
    Abstract: A centrifugal blood pump apparatus includes a plurality of permanent magnets (17) in an impeller (10) in a blood chamber (7), a plurality of coils (20) in a motor chamber (8), and a magnetic element (18) in each of the coils (20). The magnetic elements (18) are made shorter than the coils (20) to lower attractive force between the magnetic elements (18) and the permanent magnets (17) in the impeller (10), to set a large gap between the magnetic elements (18) and the permanent magnets (17). As a result, axial attractive force and negative rigidity can be lowered while required torque is satisfied.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: July 5, 2016
    Assignee: Thoratec Corporation
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Ken Sugiura
  • Patent number: 9381285
    Abstract: A centrifugal blood pump apparatus includes an impeller provided in a blood chamber, first and second permanent magnets provided in one surface and the other surface of the impeller respectively, a third permanent magnet provided in an inner wall of the blood chamber, and a magnetic element and a coil for driving the impeller to rotate with a diaphragm being interposed. First and second grooves for hydrodynamic bearing different in shape and depth from each other are formed in the inner wall of the blood chamber facing the impeller, and third and fourth grooves for hydrodynamic bearing different in shape and depth from each other are formed in the diaphragm facing the impeller. The second and fourth grooves for hydrodynamic bearing generate high hydrodynamic pressure when the impeller is activated to rotate, while the first and third grooves for hydrodynamic bearing generate high hydrodynamic pressure when the impeller steadily rotates.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: July 5, 2016
    Assignee: THORATEC CORPORATION
    Inventors: Takayoshi Ozaki, Hiroyuki Yamada, Kenichi Suzuki, Ken Sugiura
  • Patent number: 9351735
    Abstract: An insertion device of a coil includes a delivery wire driving unit, a secondary catheter driving unit, and a control circuit. A platinum coil for coil embolization is attached to the tip of a delivery wire. The delivery wire driving unit is provided in the proximity of the entrance of a Y connector such that the delivery wire is advanced and moved back. The secondary catheter driving unit is provided in the proximity of the entrance of a Y connector such that the secondary catheter is advanced and moved back. The control circuit controls the delivery wire driving unit so as to insert the delivery wire by a predetermined insertion force. If the delivery wire cannot be inserted, the control circuit controls the secondary catheter driving unit such that the secondary catheter is advanced after being moved back, and then controls the delivery wire driving unit so as to insert the delivery wire.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: May 31, 2016
    Assignee: NTN CORPORATION
    Inventors: Yoshitaka Nagano, Yukihiro Nishio, Takayoshi Ozaki
  • Patent number: 9347801
    Abstract: To provide a motor driving system for an electrically powered automotive vehicle, in which the drive motor is rotationally controlled to increase the reliability, the use is made of an angle sensor for detecting the relative rotational angle between a stator and a rotor of a drive motor for driving the electric vehicle and a controller for controlling the rotation of the drive motor on the basis of the relative rotational angle detected by the angle sensor. The angle sensor is provided in a plural number. The controller includes an angle sensor switching unit operable to select and activate one of the plurality of the angle sensors and then to switch over to an activation of another one of the angle sensors in the event that the one of the angle sensors is determined abnormal.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: May 24, 2016
    Assignee: NTN CORPORATION
    Inventors: Takayoshi Ozaki, Shintarou Ueno, Toru Takahashi
  • Patent number: 9321353
    Abstract: An inverter is provided with a temperature sensor for detecting the temperature of the inverter. A plurality of threshold values are set up for the temperature detected by the temperature sensor, electric current restricting conditions different from each other are set up for each of the temperature regions sorted out by each threshold value, and an inverter restricting unit for applying a restriction to an electric current command applied to the inverter in dependence on the electric current restricting condition of the temperature region, in which the detected temperature is included. Without the drivability of an automobile being disturbed, by means of a temperature control of the inverter, not only are any change in characteristic and impairment, resulting from an overheating thereof, prevented, but also an undesirable reduction of the life of the inverter is avoided.
    Type: Grant
    Filed: November 22, 2012
    Date of Patent: April 26, 2016
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9296291
    Abstract: An electric vehicle having an in-wheel motor drive system including: a wheel bearing unit rotatably supporting a drive wheel; a motor unit; and a reducer unit interposed between the motor unit and the wheel bearing unit, a motor torque command value Tmr being calculated from: (i) an estimate ^Te of external force influence on the drive wheel, which is estimated from the motor torque command value Tmr and a rotational frequency ?1 of a driven wheel; and (ii) a correction value Tc which is calculated from a rotational frequency ?2 of the drive wheel, an accelerator signal Tr and the estimate ^Tc.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: March 29, 2016
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9252590
    Abstract: An electric vehicle is proposed which can achieve early detection of abnormal short-circuit of motor coils, thus avoiding various driving problems. The electric vehicle includes a motor unit configured to drive a wheel. The motor unit includes a synchronous motor with three-phase motor coils. The three-phase motor coils include a first motor coil, a second motor coil and a third motor coil of different phases. One end of the first motor coil, one end of the second motor coil and one end of the third motor coil are connected with each other at a neutral point in a star connection. The electric vehicle also includes an abnormal short-circuit monitor configured to detect an abnormal short-circuit of the motor coils, and also includes an abnormalities-responsive disconnection unit configured to electrically disconnect the motor coils from the neutral point.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: February 2, 2016
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9184583
    Abstract: An electric vehicle includes an inverter unit and an ECU. The inverter unit or the ECU includes a magnetic force estimator that estimates a magnetic force of a permanent magnet structure associated with a motor rotor of a motor unit. The inverter unit or the ECU may also include a determiner for the estimated magnetic force and an abnormalities-responsive motor drive limiter. The estimator is configured to estimate, according to a predefined rule, the magnetic force, based on at least two detection signals selected from a group consisting of a detection signal indicating a rotational frequency of the motor unit, a detection signal indicating a motor voltage of the motor unit and a detection signal indicating a motor current of the motor unit.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: November 10, 2015
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki
  • Patent number: 9172319
    Abstract: A magnetic force estimating unit (38) for estimating the magnetic force of a permanent magnet of a rotor of a motor (6), a determining unit (39), and a demagnetization responsive timing changing unit (40) are provided in an inverter device (22) or an electric control unit (21). The magnetic force estimating unit (38) performs a determination of the magnetic force with a predetermined rule from detection signals of at least two of the motor rotation number, motor voltage and motor current. The determining unit (39) determines whether or not a demagnetization occurs. In response to the result of determination by the determining unit (39), the demagnetization responsive timing changing unit (40) changes the timing, at which the maximum electric current relative to the phase of the rotor is fed, so that with respect the motor drive by the inverter device the reluctance torque of the motor may be increased.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: October 27, 2015
    Assignee: NTN CORPORATION
    Inventor: Takayoshi Ozaki