Patents by Inventor Masaya Segawa
Masaya Segawa 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: 9601572Abstract: A gate pad and a source pad are disposed on a semiconductor layer. The gate pad is disposed at the center portion of the semiconductor layer and has the shape of a circle centered on the center of the semiconductor layer as viewed in plan. The source pad is disposed so as to surround the gate pad, and has the shape of a circular ring centered on the center of the semiconductor layer as viewed in plan. A plurality of unit cells that compose a trench type MOSFET element are formed in the semiconductor layer.Type: GrantFiled: April 8, 2015Date of Patent: March 21, 2017Assignee: JTEKT CORPORATIONInventors: Yasuhide Takeda, Yasuyuki Wakita, Masaya Segawa, Shigeki Nagase
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Publication number: 20150295043Abstract: A gate pad and a source pad are disposed on a semiconductor layer. The gate pad is disposed at the center portion of the semiconductor layer and has the shape of a circle centered on the center of the semiconductor layer as viewed in plan. The source pad is disposed so as to surround the gate pad, and has the shape of a circular ring centered on the center of the semiconductor layer as viewed in plan. A plurality of unit cells that compose a trench type MOSFET element are formed in the semiconductor layer.Type: ApplicationFiled: April 8, 2015Publication date: October 15, 2015Inventors: Yasuhide TAKEDA, Yasuyuki WAKITA, Masaya SEGAWA, Shigeki NAGASE
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Patent number: 9149399Abstract: A stair climbing vehicle that is able to stably climb stairs is provided. In order to keep the balance of the stair climbing vehicle at the time of climbing the stairs, the ratio between a gravity center moving control gain for the stair climbing vehicle and a turning control gain for first wheels and second wheels is changed by controlling the rotation of a first motor of each first turning actuator. Thus, it is possible to slightly turn the first wheels and the second wheels based on the posture of an occupant seated on the stair climbing vehicle when the occupant climbs the stairs with the stair climbing vehicle, thereby preventing the posture of the occupant from being unstable. Thus, the stair climbing vehicle is able to stably climb the stairs.Type: GrantFiled: August 26, 2014Date of Patent: October 6, 2015Assignee: JTEKT CORPORATIONInventors: Masaya Segawa, Motoki Shino
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Publication number: 20150061240Abstract: A stair climbing vehicle that is able to stably climb stairs is provided. In order to keep the balance of the stair climbing vehicle at the time of climbing the stairs, the ratio between a gravity center moving control gain for the stair climbing vehicle and a turning control gain for first wheels and second wheels is changed by controlling the rotation of a first motor of each first turning actuator. Thus, it is possible to slightly turn the first wheels and the second wheels based on the posture of an occupant seated on the stair climbing vehicle when the occupant climbs the stairs with the stair climbing vehicle, thereby preventing the posture of the occupant from being unstable. Thus, the stair climbing vehicle is able to stably climb the stairs.Type: ApplicationFiled: August 26, 2014Publication date: March 5, 2015Applicant: JTEKT CORPORATIONInventors: Masaya SEGAWA, Motoki SHINO
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Patent number: 8818631Abstract: A vehicle steering control unit which can implement various type of self-tuning in accordance with various properties of an objective vehicle is realized. ECU includes a control information acquiring part 501 which acquires control information which is information relating to the controlling of steering of the vehicle, a parameter value calculation part 502 which calculates after-change values for parameters whose values need to be changed in various steering control parameters based on the control information acquired by the control information acquiring part 501, and a parameter value rewrite part 503 which rewrites the values of steering control parameters. The control information includes information representing system properties of an objective vehicle, information retained by the chassis control system, and information on elements which make up a steering system which is installed on the objective vehicle.Type: GrantFiled: November 16, 2007Date of Patent: August 26, 2014Assignee: JTEKT CorporationInventor: Masaya Segawa
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Patent number: 8708089Abstract: A vehicle steering apparatus includes an actuator that generates a steering force, and a first speed reduction mechanism connected to the actuator. To the first speed reduction mechanism, a second speed reduction mechanism is connected. To the second speed reduction mechanism, a steering mechanism is connected. A sub-assembly including the actuator and the first speed reduction mechanism is configured.Type: GrantFiled: July 15, 2009Date of Patent: April 29, 2014Assignee: Jtekt CorporationInventors: Kouji Kitahata, Shiro Nakano, Masaya Segawa, Yoshiharu Nogami
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Patent number: 8155839Abstract: A motor vehicle steering apparatus is provided with: a steering-angle feedforward-control-value setting unit arranged to set a steering angle value that corresponds to a steering state; a vehicle-behavior-stabilization controlling unit including a steering-angle feedback-control-value setting unit arranged to set a steering-angle correction value that corresponds to vehicle behavior; and a feedback-gain changing unit arranged to decrease a gain of the steering-angle feedback-control-value setting unit to a value less than at a normal time, when the steering-angle correction value is equal to or less than a predetermined value, during vehicle-behavior stabilizing control by the vehicle-behavior-stabilization controlling unit.Type: GrantFiled: December 3, 2007Date of Patent: April 10, 2012Assignee: Jtekt CorporationInventors: Shiro Nakano, Masaya Segawa
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Patent number: 8154231Abstract: A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position ?^L. A high speed region position estimating portion is designed to be suitable for when the motor is operating in a high speed region, and estimates a high speed estimated rotational position ?^H. A dividing portion obtains a divided estimated rotational position ?^M by internally dividing the low speed estimated rotational position ?^L and the high speed estimated rotational position ?^H. A rotation speed calculating portion obtains a rotation speed ? of a rotor based on an output signal from a steering sensor. The rotational position of the rotor is then obtained by selecting one of i) the low speed estimated rotational position ?^L, the high speed estimated rotational position ?^H, or the divided estimated rotational position ?^M, based on that rotation speed ?.Type: GrantFiled: January 27, 2009Date of Patent: April 10, 2012Assignee: JTEKT CorporationInventors: Hayato Komatsu, Akira Tanizawa, Masaya Segawa, Yuji Kariatsumari
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Patent number: 7960940Abstract: A motor control device for controlling a d-axis current and a q-axis current on dq coordinates to control a motor, includes a q-axis current command value setting unit which sets a q-axis current command value, an upper limit/lower limit setting unit which sets an upper limit and a lower limit of the q-axis current, a comparing unit which compares the q-axis current command value set by the q-axis current command value setting unit and the upper limit and the lower limit set by the upper limit/lower limit setting unit, a q-axis current command value limiting unit which puts a limit on the q-axis current command value in accordance with a comparison result by the comparing unit, and a d-axis current command value setting unit which sets a d-axis current command value on the basis of the q-axis current command value limited by the q-axis current command value limiting unit.Type: GrantFiled: July 9, 2008Date of Patent: June 14, 2011Assignee: JTEKT CorporationInventors: Yuji Kariatsumari, Masaya Segawa
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Publication number: 20110120797Abstract: A vehicle steering apparatus includes an actuator that generates a steering force, and a first speed reduction mechanism connected to the actuator. To the first speed reduction mechanism, a second speed reduction mechanism is connected. To the second speed reduction mechanism, a steering mechanism is connected. A sub-assembly including the actuator and the first speed reduction mechanism is configured.Type: ApplicationFiled: July 15, 2009Publication date: May 26, 2011Applicant: JTEKT CORPORATIONInventors: Kouji Kitahata, Shiro Nakano, Masaya Segawa, Yoshiharu Nogami
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Publication number: 20100203594Abstract: [Problems] To achieve a high-speed PCR which can be completed in a period of several minutes and thus can be used for a new application. [Means for Solving Problems] A method for practicing a high-speed PCR under a temperature change of 10° C./sec or more, characterized in that use is made of a heat-resistant DNA polymerase exhibiting a speed of synthesizing a deoxyribonucleic acid of 100 base/sec or higher, and a reagent kit for a high-speed PCR, or use in the method.Type: ApplicationFiled: May 12, 2005Publication date: August 12, 2010Inventors: Masaya Segawa, Takashi Nakajima, Masanori Oka
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Publication number: 20100028973Abstract: The present invention provides (i) a method for proliferating a hepatitis virus, the method including the steps of: infecting, with the hepatitis virus, cells packed into a lumen of a hollow fiber made of a permeabilized membrane; and culturing the cells or (ii) a method for proliferating a hepatitis virus, the method including the steps of: infecting cells with the hepatitis virus; packing the cells into a lumen of a hollow fiber made of a permeabilized membrane; and culturing the cells. This provides an experimental system for infecting in vitro culture cells with a hepatitis virus such as HBV or HCV and then proliferating the hepatitis virus.Type: ApplicationFiled: September 26, 2007Publication date: February 4, 2010Applicants: KYOTO UNIVERSITY, TOYO BOSEKI KABUSHIKI KAISHAInventors: Tatsuya Yamaguchi, Masaya Segawa, Masashi Mizokami, Yasuhito Tanaka, Kunitada Shimotohno, Makoto Hijikata
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Publication number: 20100023215Abstract: A vehicle steering control unit which can implement various type of self-tuning in accordance with various properties of an objective vehicle is realized. ECU includes a control information acquiring part 501 which acquires control information which is information relating to the controlling of steering of the vehicle, a parameter value calculation part 502 which calculates after-change values for parameters whose values need to be changed in various steering control parameters based on the control information acquired by the control information acquiring part 501, and a parameter value rewrite part 503 which rewrites the values of steering control parameters. The control information includes information representing system properties of an objective vehicle, information retained by the chassis control system, and information on elements which make up a steering system which is installed on the objective vehicle.Type: ApplicationFiled: November 16, 2007Publication date: January 28, 2010Applicant: JTEKT CorporationInventor: Masaya Segawa
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Publication number: 20100004825Abstract: A motor vehicle steering apparatus is provided with: a steering-angle feedforward-control-value setting unit arranged to set a steering angle value that corresponds to a steering state; a vehicle-behavior-stabilization controlling unit including a steering-angle feedback-control-value setting unit arranged to set a steering-angle correction value that corresponds to vehicle behavior; and a feedback-gain changing unit arranged to decrease a gain of the steering-angle feedback-control-value setting unit to a value less than at a normal time, when the steering-angle correction value is equal to or less than a predetermined value, during vehicle-behavior stabilizing control by the vehicle-behavior-stabilization controlling unit.Type: ApplicationFiled: December 3, 2007Publication date: January 7, 2010Applicant: JTEKT CorporationInventors: Shiro Nakano, Masaya Segawa
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Publication number: 20090190903Abstract: A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position ??L. A high speed region position estimating portion is designed to be suitable for when the motor is operating in a high speed region, and estimates a high speed estimated rotational position ??H. A dividing portion obtains a divided estimated rotational position ??M by internally dividing the low speed estimated rotational position ??L and the high speed estimated rotational position ??H. A rotation speed calculating portion obtains a rotation speed ? of a rotor based on an output signal from a steering sensor. The rotational position of the rotor is then obtained by selecting one of i) the low speed estimated rotational position ??L, the high speed estimated rotational position ??H, or the divided estimated rotational position ??M, based on that rotation speed ?.Type: ApplicationFiled: January 27, 2009Publication date: July 30, 2009Applicant: JTEKT CorporationInventors: Hayato KOMATSU, Akira Tanizawa, Masaya Segawa, Yuji Kariatsumari
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Publication number: 20090015182Abstract: A motor control device for controlling a d-axis current and a q-axis current on dq coordinates to control a motor, includes a q-axis current command value setting unit which sets a q-axis current command value, an upper limit/lower limit setting unit which sets an upper limit and a lower limit of the q-axis current, a comparing unit which compares the q-axis current command value set by the q-axis current command value setting unit and the upper limit and the lower limit set by the upper limit/lower limit setting unit, a q-axis current command value limiting unit which puts a limit on the q-axis current command value in accordance with a comparison result by the comparing unit, and a d-axis current command value setting unit which sets a d-axis current command value on the basis of the q-axis current command value limited by the q-axis current command value limiting unit.Type: ApplicationFiled: July 9, 2008Publication date: January 15, 2009Applicant: JTEKT CORPORATIONInventors: Yuji KARIATSUMARI, Masaya Segawa
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Publication number: 20080051988Abstract: An in-vehicle controller of the invention is a so-called drive recorder. The drive recorder is incorporated in a steering ECU (controller) 10. For this purpose, the controller 10 is provided with function implementation units which includes a memory 22 as a data logging section, a memory controlling section 23, a threshold judging section 24 and a data-transfer timing output section 25. Vehicle information and steering information are stored in a first memory 221 in chronological order. A second memory 222 logs data recorded in a tens-second period before and after a moment when vehicle acceleration exceeds a predetermined threshold. The information logged by the second memory 222 is transferred to a hard disk of a navigation unit 30 in a predetermined timing.Type: ApplicationFiled: August 20, 2007Publication date: February 28, 2008Applicant: JTEKT CorporationInventor: Masaya Segawa
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Patent number: 7147080Abstract: The steering device is constructed by supporting a center portion of a rectangle-plate-shaped operation plate at one end of a supporting shaft projected from the front face of a dashboard so as to freely swing in right and left directions. A steering apparatus for a vehicle having the steering device detects the swing direction and the swing angle of the operation plate with a steering angle sensor provided at a support portion and moves a steering mechanism in the detected direction in accordance with the detected angle so as to steer the vehicle. With this structure, a load in steering can be decreased and tiredness in driving can be reduced. Furthermore, such a steering apparatus can realize a steering device which physically handicapped drivers can operate easily.Type: GrantFiled: April 1, 2003Date of Patent: December 12, 2006Assignee: Koyo Seiko Co., Ltd.Inventors: Masayasu Higashi, Shingo Maeda, Masaya Segawa, Shuuji Kimura, Ryouhei Hayama, Tomoyasu Kada
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Patent number: 6904346Abstract: A Steering system for a motor vehicle is provided. The system is provided with a principal steering actuator for applying a driving force to a steering mechanism; an auxiliary steering actuator capable of applying a driving force to the steering mechanism; a counter force actuator for applying a counter force to an operation member; a principal steering control section; an auxiliary steering control section; a counter force control section; first and second vehicle condition sensors; and a main controller for comprehensively controlling the control sections. An output signal of the first vehicle condition sensor is inputted to the main controller through a first vehicle condition signal line; and an output signal of the second vehicle condition sensor is inputted, through a second vehicle condition signal line, to at least one of the control sections.Type: GrantFiled: March 26, 2003Date of Patent: June 7, 2005Assignee: Koyo Seiko Co., Ltd.Inventors: Masayasu Higashi, Masaya Segawa, Shingo Maeda
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Patent number: 6763907Abstract: In a vehicle steering apparatus, a steering actuator is controlled so that the steering angle varies in accordance with the operation of an operating member. A transmission mechanism connects an operating side rotating member that is mechanically connected to the operating member and a vehicle wheel side rotating member that is mechanically connected to the vehicle wheels so that the mutual transmission of rotation is possible. Furthermore, the rotational transmission ratio between the operating side rotating member and the vehicle wheel side rotating member can be varied.Type: GrantFiled: April 14, 2003Date of Patent: July 20, 2004Assignee: Koyo Seiko Co., Ltd.Inventors: Masayuki Ueno, Katsutoshi Nishizaki, Ryouhei Hayama, Naotake Kanda, Shirou Nakano, Takeo Iino, Tomoyasu Kada, Kenji Higashi, Shingo Maeda, Shuuji Kimura, Masaya Segawa, Masayasu Higashi