Patents by Inventor Takamoto Watanabe

Takamoto Watanabe 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: 9964928
    Abstract: A first encoding part encodes a reference timing determined by a reference clock by using a delay line. A second encoding part encodes a measurement start timing and a measurement end timing of a measurement period determined by a measurement signal to be measured by also using the delay line. A count part counts the reference clocks included in the measurement period. A fraction calculation part calculates a start fraction number indicating a time difference from the measurement start timing and an immediately-following reference timing and an end fraction number indicating a time difference from the measurement end timing to an immediately-following reference timing, based on the encoding result. The fraction calculation part then calculates a fraction data indicating a difference between the measurement period and a product of the period of the reference timing and the count value of the count part.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: May 8, 2018
    Assignee: DENSO CORPORATION
    Inventors: Shigenori Yamauchi, Takamoto Watanabe, Nobuyuki Taguchi
  • Publication number: 20170336206
    Abstract: A gyro sensor apparatus includes a driving section that supplies a driving signal, which is for vibrating a sensing element of a vibration-type gyro sensor in a drive axis direction, to the sensing element, and a processing unit that receives a first vibration signal having an amplitude proportional to a driving vibration amplitude, which is an amplitude of vibration in the drive axis direction of the sensing element and a second vibration signal having an amplitude proportional to Coriolis force generated in the sensing element due to an angular velocity of the sensing element. The processing unit is configured to calculate a ratio of Coriolis force to the driving vibration amplitude based on the first vibration signal and the second vibration signal and output a result of the calculation as a result of detection of the angular velocity of the sensing element.
    Type: Application
    Filed: May 19, 2017
    Publication date: November 23, 2017
    Inventors: Takamoto WATANABE, Shigenori YAMAUCHI
  • Patent number: 9667262
    Abstract: A digital control oscillator circuit includes: a ring oscillator having delay elements delaying a pulse signal; a counter circuit counting the circulation number of the pulse signal; a rough period generation unit acquiring a period setting value as a magnification ratio for a reference clock, and counting the reference clock using an integer part of the ratio to generate a rough period timing; a fraction conversion unit converting a decimal point part of the ratio into the number of the elements passed by the pulse signal to generate a fraction; and an output processing unit selecting a timing when outputs of the ring oscillator and the counter circuit become values corresponding to the fraction as an output timing when a time corresponding to the fraction has passed after the rough period timing, and generating an output signal oscillating at a period represented by the period setting value according to the output timing.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: May 30, 2017
    Assignee: DENSO CORPORATION
    Inventors: Shigenori Yamauchi, Nobuyuki Taguchi, Takamoto Watanabe
  • Patent number: 9645122
    Abstract: A gyro sensor includes a vibrator and a drive circuit. A PWM drive signal is applied to a pair of electrodes of the vibrator. The drive circuit outputs a high level signal and a low level signal to the electrodes as the PWM drive signal. The high level signal and the low level signal have potentials higher and lower than that of the reference signal, respectively. The drive circuit outputs the high level signal to one of the pair of electrodes and the low level signal to the other of the pair of electrodes.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: May 9, 2017
    Assignee: DENSO CORPORATION
    Inventors: Shigenori Yamauchi, Takamoto Watanabe, Tomohito Terazawa
  • Patent number: 9614513
    Abstract: In a gyro sensor, a TDC detects a magnitude of vibration of a vibrator. A drive circuit (excluding the TDC) determines a duty ratio of a PWM drive signal in accordance with the magnitude of vibration so that the magnitude of vibration becomes a predetermined magnitude and outputs the PWM drive signal having the determined duty ratio. The drive circuit (excluding the TDC) includes a control circuit and a DCO. The control circuit measures time corresponding to the control value by using a gate delay time, generates the PWM drive signal having a pulse width corresponding to the control value and outputs the PWM drive signal.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: April 4, 2017
    Assignee: DENSO CORPORATION
    Inventors: Shigenori Yamauchi, Takamoto Watanabe, Nobuyuki Taguchi
  • Patent number: 9553751
    Abstract: A demodulation device for demodulating a base signal from a composite signal, which is composed of a carrier wave and a sensor modulation signal of the base signal. The demodulation device determines a difference between the composite signal of a former-half period and the composite signal of a latter-half period to be a pre-correction base signal. The former-half period is a one-half period of a sampling period starting at one of a local maximum and a local minimum of the carrier wave. The latter-half period follows the former-half period. The demodulation device determines a reference level from the composite signal and determines a signal level of a post-correction base signal based on a ratio between a signal level of the pre-correction base signal and the reference level.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: January 24, 2017
    Assignee: DENSO CORPORATION
    Inventors: Takamoto Watanabe, Shigenori Yamauchi
  • Publication number: 20170012632
    Abstract: A digital control oscillator circuit includes: a ring oscillator having delay elements delaying a pulse signal; a counter circuit counting the circulation number of the pulse signal; a rough period generation unit acquiring a period setting value as a magnification ratio for a reference clock, and counting the reference clock using an integer part of the ratio to generate a rough period timing; a fraction conversion unit converting a decimal point part of the ratio into the number of the elements passed by the pulse signal to generate a fraction; and an output processing unit selecting a timing when outputs of the ring oscillator and the counter circuit become values corresponding to the fraction as an output timing when a time corresponding to the fraction has passed after the rough period timing, and generating an output signal oscillating at a period represented by the period setting value according to the output timing.
    Type: Application
    Filed: June 22, 2016
    Publication date: January 12, 2017
    Inventors: Shigenori YAMAUCHI, Nobuyuki TAGUCHI, Takamoto WATANABE
  • Publication number: 20160337158
    Abstract: A demodulation device for demodulating a base signal from a composite signal, which is composed of a carrier wave and a sensor modulation signal of the base signal. The demodulation device determines a difference between the composite signal of a former-half period and the composite signal of a latter-half period to be a pre-correction base signal. The former-half period is a one-half period of a sampling period starting at one of a local maximum and a local minimum of the carrier wave. The latter-half period follows the former-half period. The demodulation device determines a reference level from the composite signal and determines a signal level of a post-correction base signal based on a ratio between a signal level of the pre-correction base signal and the reference level.
    Type: Application
    Filed: May 10, 2016
    Publication date: November 17, 2016
    Inventors: Takamoto WATANABE, Shigenori YAMAUCHI
  • Publication number: 20160041529
    Abstract: A first encoding part encodes a reference timing determined by a reference clock by using a delay line. A second encoding part encodes a measurement start timing and a measurement end timing of a measurement period determined by a measurement signal to be measured by also using the delay line. A count part counts the reference clocks included in the measurement period. A fraction calculation part calculates a start fraction number indicating a time difference from the measurement start timing and an immediately-following reference timing and an end fraction number indicating a time difference from the measurement end timing to an immediately-following reference timing, based on the encoding result. The fraction calculation part then calculates a fraction data indicating a difference between the measurement period and a product of the period of the reference timing and the count value of the count part.
    Type: Application
    Filed: August 4, 2015
    Publication date: February 11, 2016
    Inventors: SHIGENORI YAMAUCHI, TAKAMOTO WATANABE, NOBUYUKI TAGUCHI
  • Patent number: 9105536
    Abstract: A solid-state imaging device is capable of suppressing as much as possible an increase in power consumption of a low-frequency noise removing process. A pixel unit includes pixels outputting pixel signals corresponding to an amount of incident light and correction pixels outputting correction pixel signals corresponding to a correction reference voltage. An AD conversion circuit includes a delay circuit, to which a plurality of delay elements are connected, and outputs a digital signal corresponding to the number of delay elements through which a pulse signal passes when the pulse signal passes through the number of delay elements corresponding to a level of the pixel signal or the correction pixel signal.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: August 11, 2015
    Assignees: OLYMPUS CORPORATION, DENSO CORPORATION
    Inventors: Susumu Yamazaki, Takamoto Watanabe
  • Publication number: 20150020596
    Abstract: A gyro sensor includes a vibrator and a drive circuit. A PWM drive signal is applied to a pair of electrodes of the vibrator. The drive circuit outputs a high level signal and a low level signal to the electrodes as the PWM drive signal. The high level signal and the low level signal have potentials higher and lower than that of the reference signal, respectively. The drive circuit outputs the high level signal to one of the pair of electrodes and the low level signal to the other of the pair of electrodes.
    Type: Application
    Filed: May 28, 2014
    Publication date: January 22, 2015
    Applicant: DENSO CORPORATION
    Inventors: Shigenori YAMAUCHI, Takamoto WATANABE, Tomohito TERAZAWA
  • Publication number: 20150022277
    Abstract: In a gyro sensor, a TDC detects a magnitude of vibration of a vibrator. A drive circuit (excluding the TDC) determines a duty ratio of a PWM drive signal in accordance with the magnitude of vibration so that the magnitude of vibration becomes a predetermined magnitude and outputs the PWM drive signal having the determined duty ratio. The drive circuit (excluding the TDC) includes a control circuit and a DCO. The control circuit measures time corresponding to the control value by using a gate delay time, generates the PWM drive signal having a pulse width corresponding to the control value and outputs the PWM drive signal.
    Type: Application
    Filed: May 28, 2014
    Publication date: January 22, 2015
    Applicant: DENSO CORPORATION
    Inventors: Shigenori YAMAUCHI, Takamoto WATANABE, Nobuyuki TAGUCHI
  • Patent number: 8907731
    Abstract: A digitally-controlled oscillator circuit receives a digital value and generates a driving signal for driving an oscillator at a frequency according to the received digital value. A time-to-digital converter circuit receives a detection signal of oscillation of the oscillator, receives the driving signal, and detects a phase difference between the detection signal and the driving signal. A control circuit receives the detected phase difference and controls the frequency of the driving signal generated by the digitally-controlled oscillator circuit, such that the detected phase difference coincides with a predetermined resonant phase difference to resonate the oscillator.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: December 9, 2014
    Assignee: Denso Corporation
    Inventors: Shigenori Yamauchi, Takamoto Watanabe, Tomohito Terazawa
  • Patent number: 8436756
    Abstract: An A/D conversion device includes an A/D conversion circuit that converts an inputted analog signal to digital data and outputs it, a digital signal correction unit that performs a correction process to the digital data and outputs a digital signal, and a phase compensation unit that performs phase compensation in accordance with a phase delay amount of the digital signal with respect to the analog signal generated in the A/D conversion circuit and the digital signal correction unit wherein the A/D conversion circuit comprises a pulse transit circuit, a transmit position detection structure, and a digital data creation structure, the delay characteristic of the digital data being identified from the inputted analog signal.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: May 7, 2013
    Assignees: Olympus Corporation, Denso Corporation
    Inventors: Yukie Hashimoto, Takamoto Watanabe
  • Patent number: 8412032
    Abstract: The A/D conversion circuit may include A/D conversion units each of which converts input analog signals into digital signals, a switch unit that receives a first and second analog signals among the analog signals, the switch unit alternately switching output destinations of the first and second analog signals input in the same period to the A/D conversion units in each sampling cycle of the A/D conversion units; and an arithmetic unit that performs a differential operation between a result of addition of the digital signals output from the A/D conversion units to which the first analog signal is input and a result of addition of the digital signals output from the A/D conversion units which the second analog signal is input, the arithmetic unit outputting a third digital signal corresponding to a result of the differential operation.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: April 2, 2013
    Assignees: Olympus Corporation, Denso Corporation
    Inventors: Yasunari Harada, Takamoto Watanabe
  • Patent number: 8316710
    Abstract: The physical quantity measuring apparatus includes a first function of generating voltage used for position-controlling a movable body, a second function of detecting a position of the movable body during a position detecting period, a third function of calculating a control amount necessary to keep the movable body at a predetermined position on the basis of a detection result by the second function, and causing the first function to generate a control voltage corresponding to the calculated control amount to keep the movable body at the predetermined position during a position controlling period, and a fourth function of setting the position detecting period and the position controlling period in a time-sharing manner so that the position detecting period and the position controlling period do not overlap with each other.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: November 27, 2012
    Assignee: Denso Corporation
    Inventors: Tomohito Terazawa, Takamoto Watanabe
  • Patent number: 8307320
    Abstract: A method of placing delay units of a pulse delay circuit on a programmable logic device having logic cells in each of cell strings has a step of arranging each delay unit in one logic cell of the device such that the delay units are placed in respective specific cell strings aligned in a row direction and a step of serially connecting the delay units with one another as a straight delay line such that the delay units placed in the specific cell strings in the connecting order are aligned in the row direction. In the device, an inter-string transmission delay time on a line between two logic cells of different cell strings differs from an intra-string transmission delay time on a line between two logic cells of one cell string.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: November 6, 2012
    Assignee: Denso Corporation
    Inventors: Tomohito Terazawa, Shigenori Yamauchi, Takamoto Watanabe
  • Patent number: 8213437
    Abstract: A transmitting method has steps of modulating carrier waves having frequencies set at ┬ŻN?n (n?N; n is a positive integer) of a reference frequency with transmission signals to produce modulated signals, multiplexing the modulated signals by frequency division multiplexing to produce an input signal, and transmitting the input signal to a synchronous detector in which the transmission signals are extracted from the input signal by calculating a moving average of the input signal every sampling period of time corresponding to the reference frequency and performing an addition and subtraction calculation corresponding to the cycle of each carrier wave for the moving averages. The frequency of each carrier wave, modulated with one transmission signal having a first signal level, is equal to or lower than the frequency of any carrier wave modulated with another transmission signal having a second signal level higher than the first signal level.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: July 3, 2012
    Assignee: Denso Corporation
    Inventors: Tomohito Terazawa, Takamoto Watanabe
  • Publication number: 20120039588
    Abstract: The A/D conversion circuit may include A/D conversion units each of which converts input analog signals into digital signals, a switch unit that receives a first and second analog signals among the analog signals, the switch unit alternately switching output destinations of the first and second analog signals input in the same period to the A/D conversion units in each sampling cycle of the A/D conversion units; and an arithmetic unit that performs a differential operation between a result of addition of the digital signals output from the A/D conversion units to which the first analog signal is input and a result of addition of the digital signals output from the A/D conversion units which the second analog signal is input, the arithmetic unit outputting a third digital signal corresponding to a result of the differential operation.
    Type: Application
    Filed: October 20, 2011
    Publication date: February 16, 2012
    Applicants: DENSO CORPORATION, OLYMPUS CORPORATION
    Inventors: Yasunari Harada, Takamoto Watanabe
  • Patent number: 7932848
    Abstract: The pulse delay circuit includes a plurality of delay units connected in series or in a ring, each of the delay units being constituted of at least one inverter gate circuit grounded to a ground line, and configured to delay a pulse signal passing therethrough by a delay time thereof depending on an input signal applied thereto, and a capacitor connected between a signal line through which the voltage signal is applied to each of the delay units and the ground line. The capacitor serves as a current source to supply a current which each of the delay units consumes to invert a state thereof.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: April 26, 2011
    Assignee: Denso Corporation
    Inventor: Takamoto Watanabe