Patents by Inventor Yoshitaka Hirai

Yoshitaka Hirai 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: 10291238
    Abstract: An object is to improve Power Supply Rejection Ratio in a PLL circuit. A proportional path 103 is provided in a first power supply system 101 and outputs analog proportional signal AP according to a detection signal DET. An integral path 104 is provided in a second power supply system and outputs an analog integral signal AI according to the DET. A CCO driver 16 is provided in the first power supply system 101 and outputs control current ICCO according to the AP and the AI. A CCO 17 is provided in the second power supply system 102 and outputs an output signal Fout according to the ICCO. A phase frequency detector 11 is provided in the second power supply system 102 and configured to detect a phase difference between a reference signal Fref and a signal FM obtained by feeding back the Fout and then outputs the DET.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: May 14, 2019
    Assignee: Renesas Electronics Corporation
    Inventors: Atsushi Motozawa, Yoshitaka Hirai
  • Patent number: 9970751
    Abstract: An optical axis angle inspection device is provided with a first camera and a screen which are disposed in front of a laser distance meter, is provided with a point light source on the screen, and is provided with a second camera disposed behind the laser distance meter. An image of the laser distance meter is captured by the first camera, and the height of the point light source is fitted to the height of the laser distance meter on the basis of the captured image. Then, an image of the point light source is captured by the second camera, and a difference in height between the centroid of the captured image and the point light source is specified. The optical axis angle of the laser distance meter is calculated from the difference in height and the distance from the screen to the laser distance meter.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: May 15, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Akira Sakamoto, Tatsuya Sakai, Yoshitaka Hirai, Hirotaka Itoh, Takayuki Ogawa
  • Publication number: 20170250692
    Abstract: An object is to improve Power Supply Rejection Ratio in a PLL circuit. A proportional path 103 is provided in a first power supply system 101 and outputs analog proportional signal AP according to a detection signal DET. An integral path 104 is provided in a second power supply system and outputs an analog integral signal AI according to the DET. A CCO driver 16 is provided in the first power supply system 101 and outputs control current ICCO according to the AP and the AI. A CCO 17 is provided in the second power supply system 102 and outputs an output signal Fout according to the ICCO. A phase frequency detector 11 is provided in the second power supply system 102 and configured to detect a phase difference between a reference signal Fref and a signal FM obtained by feeding back the Fout and then outputs the DET.
    Type: Application
    Filed: February 24, 2017
    Publication date: August 31, 2017
    Inventors: Atsushi MOTOZAWA, Yoshitaka HIRAI
  • Patent number: 9553718
    Abstract: According to one embodiment, a PLL circuit includes: a phase comparator (13); a pulse width control unit that adjusts a pulse width of comparison results (UP, DN) of the phase comparator (13) and outputs comparison results (UPi, DNi) having a pulse width smaller than that of comparison results (UPp, DNp); a charge pump (14) that outputs a current (Ip) according to the comparison results (UPp, DNp); a charge pump (15) that outputs a current (Ii) according to the comparison results (UPi, DNi); a filter (16) that removes a high-frequency component of a voltage generated based on the current (Ip) and outputs a control voltage (Vp); a filter (17) that outputs, as a control voltage (Vi), a result obtained by integrating the current (Ii); and a voltage control oscillator (18) that generates an oscillating signal having a frequency according to the control voltage (Vp, Vi).
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: January 24, 2017
    Assignee: Renesas Electronics Corporation
    Inventor: Yoshitaka Hirai
  • Publication number: 20160248579
    Abstract: According to one embodiment, a PLL circuit includes: a phase comparator (13); a pulse width control unit that adjusts a pulse width of comparison results (UP, DN) of the phase comparator (13) and outputs comparison results (UPi, DNi) having a pulse width smaller than that of comparison results (UPp, DNp); a charge pump (14) that outputs a current (Ip) according to the comparison results (UPp, DNp); a charge pump (15) that outputs a current (Ii) according to the comparison results (UPi, DNi); a filter (16) that removes a high-frequency component of a voltage generated based on the current (Ip) and outputs a control voltage (Vp); a filter (17) that outputs, as a control voltage (Vi), a result obtained by integrating the current (Ii); and a voltage control oscillator (18) that generates an oscillating signal having a frequency according to the control voltage (Vp, Vi).
    Type: Application
    Filed: December 7, 2015
    Publication date: August 25, 2016
    Applicant: Renesas Electronics Corporation
    Inventor: Yoshitaka HIRAI
  • Publication number: 20160216105
    Abstract: An optical axis angle inspection device is provided with a first camera and a screen which are disposed in front of a laser distance meter, is provided with a point light source on the screen, and is provided with a second camera disposed behind the laser distance meter. An image of the laser distance meter is captured by the first camera, and the height of the point light source is fitted to the height of the laser distance meter on the basis of the captured image. Then, an image of the point light source is captured by the second camera, and a difference in height between the centroid of the captured image and the point light source is specified. The optical axis angle of the laser distance meter is calculated from the difference in height and the distance from the screen to the laser distance meter.
    Type: Application
    Filed: June 3, 2014
    Publication date: July 28, 2016
    Inventors: Akira SAKAMOTO, Tatsuya SAKAI, Yoshitaka HIRAI, Hirotaka ITOH, Takayuki OGAWA
  • Patent number: 9279743
    Abstract: An inspection method of the present invention performs a step of giving the electric motor an instructing for rotating a foot shaft in a reverse direction and checking whether the foot shaft is rotating in the reverse direction, and a step of checking whether hydraulic pressure acting on the hydraulic pump has reached a predetermined pressure level. By checking a rotating direction of the electric motor, it is possible to check electrical connections. By checking the hydraulic pressure, it is possible to check whether there is any trouble in a hydraulic system. Namely, the present invention can perform an electrical connection check and a hydraulic pressure check in a collective fashion.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: March 8, 2016
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Hirotsune Fukei, Manato Saitou, Yoshitaka Hirai, Minoru Tsuchida, Masahide Ueda
  • Publication number: 20150134195
    Abstract: An inspection method of the present invention performs a step of giving the electric motor an instructing for rotating a foot shaft in a reverse direction and checking whether the foot shaft is rotating in the reverse direction, and a step of checking whether hydraulic pressure acting on the hydraulic pump has reached a predetermined pressure level. By checking a rotating direction of the electric motor, it is possible to check electrical connections. By checking the hydraulic pressure, it is possible to check whether there is any trouble in a hydraulic system. Namely, the present invention can perform an electrical connection check and a hydraulic pressure check in a collective fashion.
    Type: Application
    Filed: November 11, 2014
    Publication date: May 14, 2015
    Inventors: Hirotsune Fukei, Manato Saitou, Yoshitaka Hirai, Minoru Tsuchida, Masahide Ueda
  • Patent number: 8616086
    Abstract: A harmonic speed reducer for robots is provided with a frame, an annular circular spline, a cylindrical flexspline, and an elliptical wave generator. The frame has internal threads each tapped parallel to the center axis line, the threads each extending from a circular spline mounting seat to the inside of the frame. The internal thread in the circular spline mounting seat has a peripheral edge portion at an opening thereof with a recess. The recess is formed so as to have a diameter larger than a diameter of the internal thread.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: December 31, 2013
    Assignee: Denso Wave Incorporated
    Inventors: Yoshitaka Hirai, Masatoshi Kojima
  • Patent number: 8492070
    Abstract: A photocurable and thermosetting composition comprises (A) a carboxyl group-containing resin having at least one carboxyl group in its molecule, (B) a photopolymerization initiator having an oxime linkage represented by the following general formula (I), (C) a reactive diluent, and (D) an epoxy compound having two or more epoxy groups in its molecule. The above-mentioned photopolymerization initiator (B) is incorporated into a formulation which is different from at least a formulation into which the above-mentioned carboxyl group-containing resin (A) and the above-mentioned reactive diluent (C) are incorporated to formulate a system comprising at least two parts.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: July 23, 2013
    Assignee: Taiyo Ink Manufacturing Co., Ltd.
    Inventors: Hideaki Kojima, Hidekazu Miyabe, Shouji Minegishi, Naoki Yoneda, Yoshitaka Hirai
  • Publication number: 20120295200
    Abstract: A photocurable and thermosetting composition comprises (A) a carboxyl group-containing resin having at least one carboxyl group in its molecule, (B) a photopolymerization initiator having an oxime linkage represented by the following general formula (I), (C) a reactive diluent, and (D) an epoxy compound having two or more epoxy groups in its molecule. The above-mentioned photopolymerization initiator (B) is incorporated into a formulation which is different from at least a formulation into which the above-mentioned carboxyl group-containing resin (A) and the above-mentioned reactive diluent (C) are incorporated to formulate a system comprising at least two parts.
    Type: Application
    Filed: July 27, 2012
    Publication date: November 22, 2012
    Applicant: Taiyo Ink Manufacturing Co., Ltd.
    Inventors: Hideaki Kojima, Hidekazu Miyabe, Shouji Minegishi, Naoki Yoneda, Yoshitaka Hirai
  • Patent number: 8264286
    Abstract: A first exemplary aspect of an embodiment of the present invention is a phase-locked loop circuit including: a voltage-current converter that converts a control voltage into a control current, the control voltage generated according to a phase difference between an input pulse signal and a feedback pulse signal fed back from an output side of a current controlled oscillator; the current controlled oscillator that generates an output pulse signal having a frequency according to the control current; a current detection unit that detects the control current; and a frequency range switch that switches a frequency range of the output pulse signal according to the detected control current.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: September 11, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Yoshitaka Hirai
  • Patent number: 8040191
    Abstract: A PLL circuit includes first and second charge pump circuits controlling an output voltage according to an output signal of a phase comparator, a first filter filtering out predetermined frequency component included in a signal generated according to current output from the first charge pump circuit, and outputting the signal as a first voltage signal, a second filter inputting a current output from the second charge pump circuit and outputting a predetermined constant voltage as a second voltage signal, a voltage control unit outputting a third voltage signal according to a comparison result between the first voltage signal output from the first filter and a reference voltage signal, and a voltage controlled oscillator that has a first low gain property, a second low gain property, and a high gain property, and is controlled by the first to third voltage signals to generate an oscillating frequency.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: October 18, 2011
    Assignee: Renesas Electronics Corporation
    Inventor: Yoshitaka Hirai
  • Publication number: 20100288066
    Abstract: A harmonic speed reducer for robots is provided with a frame, an annular circular spline, a cylindrical flexspline, and an elliptical wave generator. The frame has internal threads each tapped parallel to the center axis line, the threads each extending from a circular spline mounting seat to the inside of the frame. The internal thread in the circular spline mounting seat has a peripheral edge portion at an opening thereof with a recess.
    Type: Application
    Filed: May 14, 2010
    Publication date: November 18, 2010
    Applicant: DENSO WAVE INCORPORATED
    Inventors: Yoshitaka Hirai, Masatoshi Kojima
  • Publication number: 20100271141
    Abstract: A PLL circuit includes first and second charge pump circuits controlling an output voltage according to an output signal of a phase comparator, a first filter filtering out predetermined frequency component included in a signal generated according to current output from the first charge pump circuit, and outputting the signal as a first voltage signal, a second filter inputting a current output from the second charge pump circuit and outputting a predetermined constant voltage as a second voltage signal, a voltage control unit outputting a third voltage signal according to a comparison result between the first voltage signal output from the first filter and a reference voltage signal, and a voltage controlled oscillator that has a first low gain property, a second low gain property, and a high gain property, and is controlled by the first to third voltage signals to generate an oscillating frequency.
    Type: Application
    Filed: March 31, 2010
    Publication date: October 28, 2010
    Inventor: Yoshitaka HIRAI
  • Publication number: 20100052798
    Abstract: A first exemplary aspect of an embodiment of the present invention is a phase-locked loop circuit including: a voltage-current converter that converts a control voltage into a control current, the control voltage generated according to a phase difference between an input pulse signal and a feedback pulse signal fed back from an output side of a current controlled oscillator; the current controlled oscillator that generates an output pulse signal having a frequency according to the control current; a current detection unit that detects the control current; and a frequency range switch that switches a frequency range of the output pulse signal according to the detected control current.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 4, 2010
    Inventor: Yoshitaka Hirai
  • Patent number: 7590263
    Abstract: An ECU of a night vision system stores small obtained images of provisional targets as six templates depending on the distance from infrared cameras, and selects one of the templates depending on the distance up to an actual object. Using the selected template, the ECU performs template matching on images obtained by the infrared cameras, and calculates coordinates of the inspection target. The ECU compares the calculated coordinates of the inspection target and stored reference coordinates with each other, and determines mounted angles of the infrared cameras.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: September 15, 2009
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masahito Watanabe, Masakazu Saka, Nobuharu Nagaoka, Yoshitaka Hirai, Toshiya Okabe
  • Publication number: 20080227883
    Abstract: A photocurable and thermosetting composition comprises (A) a carboxyl group-containing resin having at least one carboxyl group in its molecule, (B) a photopolymerization initiator having an oxime linkage represented by the following general formula (I), (C) a reactive diluent, and (D) an epoxy compound having two or more epoxy groups in its molecule. The above-mentioned photopolymerization initiator (B) is incorporated into a formulation which is different from at least a formulation into which the above-mentioned carboxyl group-containing resin (A) and the above-mentioned reactive diluent (C) are incorporated to formulate a system comprising at least two parts.
    Type: Application
    Filed: May 16, 2008
    Publication date: September 18, 2008
    Applicant: Taiyo Ink Manufacturing Co., Ltd.
    Inventors: Hideaki Kojima, Hidekazu Miyabe, Shouji Minegishi, Naoki Yoneda, Yoshitaka Hirai
  • Patent number: 7394319
    Abstract: A pulse width modulation circuit comprises a multiphase clock generation section which generates multiphase clock signals based on a reference clock, and a pulse width modulation signal generation section which generates pulse width modulation signals based on input data and on multiphase clock signals generated by the multiphase clock generation section. The multiphase clock generation section has a phase-locked loop circuit and a clock selection circuit which selects an arbitrary clock signal from among the multiphase clock signals and outputs the selected clock signal to the phase-locked loop circuit as a feedback clock.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: July 1, 2008
    Assignee: NEC Electronics Corporation
    Inventor: Yoshitaka Hirai
  • Publication number: 20060255866
    Abstract: A pulse width modulation circuit comprises a multiphase clock generation section which generates multiphase clock signals based on a reference clock, and a pulse width modulation signal generation section which generates pulse width modulation signals based on input data and on multiphase clock signals generated by the multiphase clock generation section. The multiphase clock generation section has a phase-locked loop circuit and a clock selection circuit which selects an arbitrary clock signal from among the multiphase clock signals and outputs the selected clock signal to the phase-locked loop circuit as a feedback clock.
    Type: Application
    Filed: April 27, 2006
    Publication date: November 16, 2006
    Applicant: NEC ELECTRONICS CORPORATION
    Inventor: Yoshitaka Hirai