Patents by Inventor Mitsuo Sasaki

Mitsuo Sasaki 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).

  • Publication number: 20190291211
    Abstract: According to an embodiment, a nozzle of an additive manufacturing device includes a first inner surface that defines a first path through which an energy ray passes; and a second inner surface that defines a second path that extends along the first path and through which gas and a powder material pass. The first path opens to a leading end of the nozzle. The second path opens to near or around the first path. At least part of the second inner surface includes a first region having a larger friction coefficient for the powder material than the friction coefficient of at least one of the first inner surface and an outer peripheral surface of the leading end.
    Type: Application
    Filed: March 20, 2019
    Publication date: September 26, 2019
    Applicants: Technology Research Association for Future Additive Manufacturing, KABUSHIKI KAISHA TOSHIBA, Toshiba Kikai Kabushiki Kaisha
    Inventors: Satoshi TSUNO, Hiroshi Ohno, Mitsuo Sasaki, Tomohiko Yamada, Yasutomo Shiomi, Shimpei Fujimaki
  • Patent number: 10407092
    Abstract: A power steering apparatus and a control circuit for a power steering apparatus are provided. The power steering apparatus detects an abnormality in the power steering apparatus based on whether there is a periodic change within a predetermined frequency range with respect to the number of rotations of an electric motor, a steering velocity, or a steering torque.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: September 10, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo Sasaki, Makoto Goto
  • Patent number: 10411621
    Abstract: In the drive device for a three-phase synchronous motor, if one of the two rotational position detectors is defective, it is necessary to identify the rotational position detector having abnormal output and is in the detective state. To do this, three or more rotational position detectors are required, which increases costs of the rotational position detectors. By comparing the outputs of two rotational position detectors, an abnormality of ether one of the two detectors is detected. The abnormal detector is identified with the use of rotational position estimating means. The drive of the three-phase synchronous motor is controlled with the use of the output ? of the properly functioning one of the first and second rotational position detectors.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: September 10, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takafumi Hara, Toshiyuki Ajima, Shigehisa Aoyagi, Mitsuo Sasaki, Takumi Hisazumi
  • Patent number: 10399182
    Abstract: The mobility of an optical processing apparatus is improved. There is provided an optical processing apparatus for scanning a processing region having an at least one-dimensional spread by moving a nozzle head while irradiating the processing region with an optical processing light beam via the nozzle head, including a light source that emits, to air, the optical processing light beam toward the nozzle head, a nozzle head that includes a hollow nozzle in a vertical direction and a light beam direction changing optical system which receives the light beam emitted from the light source and propagated in the air, and changes a propagation direction of the received light beam to a direction of a currently processed processing point in the processing region, and a main scanning direction moving mechanism that moves the nozzle head by causing the nozzle head to scan in a main scanning direction of the processing region.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: September 3, 2019
    Assignee: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING
    Inventors: Hiroshi Ohno, Yuji Sasaki, Satoshi Tsuno, Naotada Okada, Mitsuo Sasaki
  • Patent number: 10399594
    Abstract: A device for controlling a power steering device having: a steering mechanism for transmitting the rotation of a steering wheel to steered wheels; an electric motor for imparting steering force to the steering mechanism; a transmission mechanism for transmitting the rotational force of the motor to the steering mechanism; a housing for accommodating at least part of the steering mechanism, the transmission mechanism, and the motor; a water sensor for detecting moisture in the housing; and a torque sensor for detecting steering torque; wherein the control device is provided with a first fault assessment unit for assessing faults in the power steering device on the basis of a steering torque signal, etc., and a second fault assessment unit for assessing faults in the power steering device when the water sensor has sensed moisture. It is thereby possible to assess faults in the power steering device from a multifaceted perspective.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: September 3, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Makoto Goto, Mitsuo Sasaki
  • Patent number: 10392048
    Abstract: Disclosed is a power steering device 1 having a control unit 33 equipped with an abnormality detection circuit 50. The abnormality detection circuit 50 is configured to judge the occurrence of an abnormality in the power steering device when a peak level Trp of a frequency component of a steering torque Tr etc. that periodically changes in a frequency range of 20 to 25 Hz becomes higher than a predetermined value.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: August 27, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo Sasaki, Makoto Goto
  • Patent number: 10392049
    Abstract: A CPU 38 is connected to a first judgment circuit 36 accommodated in a sensor housing 15 through a first signal line 44A and a second signal line 45A. The first judgment circuit 36 is connected to first to fourth torque detection elements 32a, 33a, 34a and 35a of a quadruple torque sensor 16 through first to fourth torque signal lines 46, 47, 48 and 49. Normal and abnormality of torque signals from the torque detection elements 32a, 33a, 34a and 35a are judged are judged by a predetermined judgment manner in the first judgment circuit 36. Then, two normal torque signals, which have been judged to be normal, are transmitted to the CPU 38 through the first signal line 44A and the second signal line 45A.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: August 27, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo Sasaki, Kohtaro Shiino
  • Patent number: 10369661
    Abstract: An optical processing head capable of downsizing an apparatus while increasing the shaping accuracy of optical processing is disclosed. The optical processing head performs processing while moving, in a predetermined moving direction on a processing surface, an optical spot formed by condensing light emitted by a light source. The optical processing head includes an optical element that condenses light emitted by the light source to generate the optical spot of a shape elongated in the moving direction of the optical spot. Part of the optical spot is set as a processing region, the front side and/or rear side of the processing region in the moving direction is set as a pre-heating region and/or post-heating region, and a processing target object before and/or after processing in the region is heated.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: August 6, 2019
    Assignee: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING
    Inventors: Hiroshi Ohno, Yuji Sasaki, Mitsuo Sasaki, Takashi Obara, Kazuyuki Masukawa
  • Patent number: 10371645
    Abstract: An optical processing head that detects a trouble of an optical processing head that will be generated at the time of optical processing before the trouble occurs is disclosed. The optical processing head that performs processing by condensing, on a process surface, a ray emitted by a light source for processing includes a cylindrical housing that surrounds a ray for processing emitted by the light source for processing, a ray emitter for inspection that is incorporated in the cylindrical housing and arranged outside the path of the ray for processing, and a light receiver that is incorporated in the cylindrical housing, arranged outside the path of the ray for processing, and receives a ray for inspection emitted by the ray emitter for inspection. The contamination of the inner surface of the cylindrical housing or the concentration of a scattering object flowing into the cylindrical housing is inspected by using a signal acquired from the light receiver.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: August 6, 2019
    Assignee: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING
    Inventors: Hiroshi Ohno, Yuji Sasaki, Mitsuo Sasaki, Takashi Obara, Kazuyuki Masukawa
  • Publication number: 20190176877
    Abstract: An actuator system has an actuator drivable in two directions, first and second actuator control sections to output control signals to the actuator, and an abnormality detection section to control the first and second actuator control sections and the abnormality detection section detects abnormality by making the first actuator control section output a first control signal to drive the actuator in a first direction and making the second actuator control section output a second control signal to drive the actuator in a second direction that is paired with the first direction.
    Type: Application
    Filed: March 22, 2017
    Publication date: June 13, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yasuo SUGURE, Mitsuo SASAKI
  • Publication number: 20190091926
    Abstract: A nozzle according to one embodiment has an inner surface and an outer surface, and is provided with a first passage through which an energy ray passes, and a second passage that is provided between the inner surface and the outer surface, and through which powder and fluid pass. The second passage includes a second open end on one end thereof in a first direction. A first surface that is one of the inner surface and the outer surface includes a first edge on one end thereof in the first direction. A second surface that is the other one of those includes a second edge on one end thereof in the first direction, and is distanced from the first edge toward the first direction. The fluid ejected from the second open end flows along the second surface, and separates at the second edge.
    Type: Application
    Filed: September 14, 2018
    Publication date: March 28, 2019
    Applicants: Technology Research Association for Future Additive Manufacturing, Kabushiki Kaisha Toshiba, Toshiba Kikai Kabushiki Kaisha
    Inventors: Hiroshi Ohno, Satoshi Tsuno, Mitsuo Sasaki, Tomohiko Yamada, Yasutomo Shiomi, Shimpei Fujimaki
  • Publication number: 20190084226
    Abstract: A nozzle according to one embodiment includes a nozzle unit and a guide surface. A first passage, a second passage, and the guide surface are provided to the nozzle unit. The first passage has a first open end. The second passage has a second open end, and a section that is positioned upstream of the second open end and that extends in a second direction. The guide surface has an edge in a first direction. The guide surface is exposed on the outer side at the edge, is along a third direction at the edge, the third direction being a direction becoming more distanced from an axis than the second direction does, as the third direction is extended further toward the first direction. A flow of fluid ejected from the second open end follows the guide surface, and becomes separated from the nozzle unit at the edge.
    Type: Application
    Filed: September 17, 2018
    Publication date: March 21, 2019
    Applicants: Technology Research Association for Future Additive Manufacturing, Kabushiki Kaisha Toshiba, Toshiba Kikai Kabushiki Kaisha
    Inventors: Hiroshi OHNO, Satoshi TSUNO, Mitsuo SASAKI, Tomohiko YAMADA, Yasutomo SHIOMI, Shimpei FUJIMAKI
  • Publication number: 20190077450
    Abstract: Short circuit abnormality between redundant systems with respect to motor redundant systems is detected. A motor actuator includes a first inverter circuit configured to control power supplied to a first motor stator, a second inverter circuit configured to control power supplied to a second motor stator, and a control unit portion including a calculation circuit.
    Type: Application
    Filed: February 13, 2017
    Publication date: March 14, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventor: Mitsuo SASAKI
  • Publication number: 20190071116
    Abstract: Provided is a control apparatus for a power steering apparatus and a power steering apparatus capable of gradually increasing a steering reaction force felt by a driver since after a start of assist limitation when imposing the assist limitation for reducing power to be supplied to an electric motor that provides a steering force.
    Type: Application
    Filed: March 13, 2017
    Publication date: March 7, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo SASAKI, Takumi HISAZUMI, Kazutoshi TANABE
  • Patent number: 10220473
    Abstract: Ejection and stop of a powder flow are switched while maintaining a once generated steady flow without stopping it. A processing nozzle includes a supply source of a fluid containing a powder, a first channel through which the fluid supplied from the supply source passes, a second channel that supplies the fluid to an ejection port of the nozzle, a third channel that releases the fluid outside the nozzle, and a switch that causes the first channel and the second channel to communicate with each other when supplying the fluid to the ejection port, and causes the first channel and the third channel to communicate with each other when not supplying the fluid to the ejection port.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: March 5, 2019
    Assignee: Technology Research Association for Future Additive Manufacturing
    Inventors: Hiroshi Ohno, Mitsuo Sasaki, Yuji Sasaki, Satoshi Tsuno, Go Obara, Tomohiko Yamada, Yasutomo Shiomi, Takashi Obara
  • Patent number: 10214235
    Abstract: Disclosed is a power steering device having at least two redundant steering torque sensor units, at least two redundant steering angel sensor units, at least two redundant motor position sensor units and a control unit configured to: in a normal state, perform steering assist control based on a steering torque detection signal of one of the steering torque sensor units, a steering angle detection signal of one of the steering angle sensor units and a motor position detection signal of one of the motor position sensor units; perform redundant monitoring on the steering torque sensor units, the steering angel sensor units and the motor position sensor units; and, upon detection of an abnormality in any sensor output signal by the redundant monitoring, switch the abnormal signal to an alternative signal.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: February 26, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo Sasaki, Takumi Hisazumi
  • Publication number: 20190054952
    Abstract: Provided is a control device (14) for a power steering device including a steering mechanism (1) configured to transmit rotation of a steering wheel to a steered wheel, and an electric motor (13) configured to apply a steering force to the steering mechanism. The control device includes: a command signal calculation part (61) configured to calculate a motor command signal (Io) for control of driving of the electric motor, based on a state of steering of the steering wheel, and output the command signal to the electric motor; a vibration signal receiving part (69) configured to receive a vibration signal of the power steering device; and an abnormality determination part (63) configured to determine whether or not the power steering device is abnormal, based on a Y-axis acceleration signal (Gy) received by the vibration signal reception part.
    Type: Application
    Filed: January 20, 2017
    Publication date: February 21, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo SASAKI, Makoto GOTO
  • Publication number: 20190023309
    Abstract: A power steering device includes a steering mechanism, an electric motor for applying a steering assist force to the steering mechanism, and a first motor rotational position sensor for sensing as an actual axis phase a rotational position of a rotor of the electric motor. A control device is configured to: receive input of a signal of first actual axis phase outputted from the first motor rotational position sensor; receive input of a signal of value of electric current flowing through the electric motor; estimate as a control phase a phase of an induced voltage occurring in the electric motor, based on the signal of value of electric current; and determine whether or not the first motor rotational position sensor is abnormal, based on a difference between the first actual axis phase and the control phase.
    Type: Application
    Filed: July 29, 2016
    Publication date: January 24, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuo SASAKI, Takumi HISAZUMI, Shigehisa AOYAGI
  • Publication number: 20190016378
    Abstract: Provided is a steering device which allows continued safe travel in the event of a fault during automatic steering control. The steering device is equipped with an electric drive device composed of a plurality of systems of electric motors and has an assist control function for assisting a driver in steering and an automatic steering control function for automatically controlling the steering angle of steered wheels on the basis of a steering angle instruction value.
    Type: Application
    Filed: January 5, 2017
    Publication date: January 17, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takahiro ITOU, Masaru YAMASAKI, Mitsuo SASAKI, Kazuya YAMANO
  • Publication number: 20190016377
    Abstract: In a steering control device equipped with an electric motor having a plurality of winding sets and a plurality of assist current output sections each outputting a motor drive current caused to flow through each of the plurality of winding sets, it is possible to quickly make the driver aware of a state in which abnormality is generated and to suppress deterioration in operability in the state in which the abnormality has been generated.
    Type: Application
    Filed: January 5, 2017
    Publication date: January 17, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Tadashi SATOU, Mitsuo SASAKI