Patents by Inventor Tomoyuki Yagi

Tomoyuki Yagi 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: 9241116
    Abstract: A radiation image pickup apparatus capable of setting an optimum threshold value used for instantaneously and highly accurately detecting the presence/absence of irradiation includes a pixel array having a plurality of pixels arranged in a matrix, where each of the pixels includes a conversion element and a switch element, a drive circuit for supplying a drive signal for controlling the switch element between a conducting state and a non-conducting state, a detection unit for outputting a detection signal varying with the intensity of irradiation of the pixel array, and an arithmetic unit for calculating an end threshold value used to detect end of irradiation on the basis of the signal output from the detection unit during a period of time during which irradiation is applied to the pixel array in which the switch elements of the pixels are set in a non-conducting state by the drive circuit.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: January 19, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Eriko Sugawara, Hideyuki Okada
  • Patent number: 9234966
    Abstract: A radiation imaging apparatus including pixels; driving lines; a driving circuit; bias lines; an acquisition unit configured to acquire an evaluation value based on a current flowing in the bias line; a determination unit configured to compare the evaluation value with a comparison target value to determine whether radiation is irradiated; a control unit configured to control the acquisition unit and the determination unit; and a storage unit configured to store the evaluation value used in the determination process, is provided. A comparison target value used in a given determination process is based on one or more evaluation values used in one or more determination processes which are performed before the given determination process and in which it is determined that radiation has not been irradiated.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 12, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Eriko Sugawara, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Hideyuki Okada
  • Publication number: 20150338530
    Abstract: A radiographic image capturing apparatus, comprising a plurality of sensors arrayed on a substrate, a driving unit, a detection unit and a control unit, wherein the control unit is configured to perform a first control controlling the driving unit so as to repeatedly initialize the plurality of sensors on a row-by-row basis before a start of emission of radiation, and a second control controlling the driving unit so as to interrupt the initialization in response to a detection signal from the detection unit and cause the plurality of sensors to output signals, and the apparatus further comprises a determination unit configured to determine whether or not the detection signal is a signal which was output in response to the start of emission of radiation.
    Type: Application
    Filed: May 18, 2015
    Publication date: November 26, 2015
    Inventors: Hideyuki Okada, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Atsushi Iwashita, Eriko Sato, Takuya Ryu, Kosuke Terui
  • Publication number: 20150303616
    Abstract: An ultrasound probe according to the present invention includes: a main body section including a plurality of transducers configured to send and receive an ultrasonic wave to and from an inside of a diagnosing object; a cable including a plurality of signal lines connected to the plurality of transducers, and a sheath configured to cover the plurality of signal lines; a connector section configured to connect the cable to an ultrasound diagnostic apparatus; and a bush including a through hole where the cable is passed, configured to fix the cable passed through the through hole together with the sheath that is folded back, and including a fixed portion fixed, in place, to the connector section.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 22, 2015
    Inventors: Tomoyuki YAGI, Gen SHIINA, Hakaru MATSUI
  • Publication number: 20150293238
    Abstract: A radiation imaging apparatus comprising a plurality of sensors arrayed to form a plurality of rows and a plurality of columns on a substrate and a driving unit configured to drive the plurality of sensors row by row, wherein the driving unit performs a first operation of driving the plurality of sensors while selecting the plurality of rows in a first order, and a second operation of driving the plurality of sensors while selecting the plurality of rows in a second order different from the first order after the first operation, such that a time difference is produced between a sensor in each row and a sensor in a neighboring row from the selection in the first order to the selection in the second order.
    Type: Application
    Filed: April 1, 2015
    Publication date: October 15, 2015
    Inventors: Atsushi Iwashita, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Hideyuki Okada, Eriko Sato, Takuya Ryu, Kosuke Terui
  • Publication number: 20150279882
    Abstract: An imaging apparatus includes a pixel that generates charge; an integral amplifier that integrates charge transferred from the pixel; a low pass filter to which output of the integral amplifier is supplied and whose time constant is variable; first and second sample-and-hold circuits that sample and hold output of the low pass filter before and after the charge is transferred from the pixel to the integral amplifier, respectively; a differential circuit that outputs a difference between signals held by the first and second sample-and-hold circuits; and a control circuit that changes the time constant. The control circuit decreases the time constant after the sampling by the first sample-and-hold circuit ends, and increases the time constant in the middle of the sampling by the second sample-and-hold circuit.
    Type: Application
    Filed: March 23, 2015
    Publication date: October 1, 2015
    Inventors: Tomoyuki Yagi, Toshio Kameshima, Katsuro Takenaka, Sho Sato, Hideyuki Okada, Atsushi Iwashita, Eriko Sato, Takuya Ryu
  • Patent number: 9134432
    Abstract: A radiation imaging apparatus, comprising a sensor array in which a plurality of sensors configured to output signals corresponding to irradiated radiation, a detection unit configured to detect radiation, a driving unit configured to drive the sensor array, so as to initialize the plurality of sensors for each row repeatedly at least until the detection unit detects irradiation of radiation and to read out signals from the plurality of sensors for each row sequentially, and a processing unit configured to process signals from the sensor array, so as to correct a signal from the sensor on a row, of the plurality of sensors, which has been initialized during the irradiation of radiation, based on a timing of the initialization.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: September 15, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsushi Iwashita, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Eriko Sugawara, Hideyuki Okada
  • Patent number: 9134435
    Abstract: An image-pickup apparatus including a detector comprising a detecting unit and a reading circuit, the detecting unit including pixels, each of which including a conversion element, the reading circuit which includes a connecting unit that is electrically connected to a signal wire transferring an electric signal and that electrically connects the signal wire to a node, and which performs a reading operation to output the electric signal from the pixel. A control unit controls an operation of the reading circuit, and a sensing unit senses the end of radiation irradiation based on an output of the reading circuit, which is acquired during the period of an accumulation operation of the detector. The control unit starts establishing the electrical connection between the signal wire and the node through the connecting unit based on the sensed irradiation end, and retains the electrical connection until the start of the reading operation.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: September 15, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sho Sato, Tadao Endo, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Atsushi Iwashita
  • Patent number: 9128196
    Abstract: A radiation imaging apparatus comprises a conversion element and a transistor. A drive unit performs a reset operation at a plurality of times, by supplying a conducting voltage to gates of the transistors, successively, one row by one row, an operation of stopping the supplying of the conducting voltage responsive to detecting the irradiation of the radiation to perform an accumulation operation and, after the reset operation, a read out operation. During the reset operation, a period between the supplying the conducting voltage to the gates of the transistors in one row and the supplying the conducting voltage subsequently to the gates of the transistors in another row is different from a period between the supplying the conducting voltage to the gates of the transistors in the another row and the supplying the conducting voltage subsequently to the gates of the transistors in further another row.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: September 8, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sho Sato, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Hideyuki Okada, Atsushi Iwashita, Eriko Sato, Takuya Ryu
  • Patent number: 9048154
    Abstract: A radiation imaging apparatus, comprising an imaging unit in which a plurality of pixels are arranged to form a plurality of rows and a plurality of columns, and a control unit configured to control the imaging unit so as to perform reset operation for initializing each of the plurality of pixels repeatedly, and readout operation, after the reset operation, for reading out a signal from each of the plurality of pixels sequentially, wherein one cycle length of the reset operation is shorter than a period of time required for the readout operation, and a pulse width of a signal supplied to each of the plurality of pixels in the reset operation is shorter than a pulse width of a signal supplied to each of the plurality of pixels in the readout operation.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: June 2, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Katsuro Takenaka, Toshio Kameshima, Tomoyuki Yagi, Hideyuki Okada, Sho Sato, Atsushi Iwashita, Eriko Sugawara
  • Patent number: 9035265
    Abstract: A radiation imaging apparatus, comprising a sensor array configured to output a signal in accordance with irradiated radiation, a driving unit configured to output a signal from the sensor array by driving the sensor array, a detecting unit configured to detect irradiated radiation, a control unit configured to control the driving unit to perform first readout to read out a signal corresponding to charge accumulated in the sensor array from the sensor array and perform second readout to further read out a signal from the sensor array at least in a case where the first readout has started during irradiation of radiation, and a processing unit configured to correct the signal obtained by the first readout based on the signal obtained by the second readout.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: May 19, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomoyuki Yagi, Toshio Kameshima, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Eriko Sugawara, Hideyuki Okada
  • Patent number: 8928779
    Abstract: An image pickup apparatus includes a detection unit in which a matrix of pixels converts radiation or light into analog electrical signals, a reading circuit configured to perform signal processing operation by reading the analog electric signals on a row-by-row basis, an A/D converter configured to convert a pixel signal output from the reading circuit into pixel data, and a correction processing unit configured to correct the pixel data. A control unit performs control processing so that the reading circuit outputs reset signals to the A/D converter in a period in which the signal processing operation of a predetermined row is performed, the A/D converter converts the reset signals into pieces of reset data in the period, and the correction processing unit averages the pieces of reset data output from the A/D converter and performs subtraction with the averaged reset data and the pixel data output from the A/D converter.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: January 6, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsuro Takenaka, Daisuke Yoshida, Toshio Kameshima, Tomoyuki Yagi, Keigo Yokoyama, Sho Sato
  • Publication number: 20140361184
    Abstract: A radiation imaging apparatus comprises a conversion element and a transistor. A drive unit performs a reset operation at a plurality of times, by supplying a conducting voltage to gates of the transistors, successively, one row by one row, an operation of stopping the supplying of the conducting voltage responsive to detecting the irradiation of the radiation to perform an accumulation operation and, after the reset operation, a read out operation. During the reset operation, a period between the supplying the conducting voltage to the gates of the transistors in one row and the supplying the conducting voltage subsequently to the gates of the transistors in another row is different from a period between the supplying the conducting voltage to the gates of the transistors in the another row and the supplying the conducting voltage subsequently to the gates of the transistors in further another row.
    Type: Application
    Filed: May 30, 2014
    Publication date: December 11, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Sho Sato, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Hideyuki Okada, Atsushi Iwashita, Eriko Sato, Takuya Ryu
  • Publication number: 20140361189
    Abstract: A radiation imaging system includes: a sensor unit including a plurality of pixels arranged in a matrix, and configured to convert a radiation into an electric charge and to output a pixel output value; a detecting unit configured to detect an irradiation start of the radiation; and a control unit configured to output image information based on the irradiation of the radiation and to output dark image information for the plurality of pixels.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 11, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Eriko Sato, Hideyuki Okada, Takuya Ryu
  • Patent number: 8907294
    Abstract: An image pickup apparatus includes a detector having pixels divided into first and second pixel groups, a signal processor including a reading circuit unit including first and second reading circuits, an A/D conversion unit including first and second A/D converters, a digital data processing circuit, and a controller. The controller instructs the signal processor to perform a signal processing operation several times of adding direct current potentials to analog electric signals of pixels from the reading circuit unit, supplying the signals to the A/D conversion unit, and outputting digital data to the digital data processing circuit while the direct current potentials are changed, and an average processing operation of averaging the digital data for the pixels using the digital data processing circuit.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: December 9, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshio Kameshima, Tadao Endo, Tomoyuki Yagi, Katsuro Takenaka, Keigo Yokoyama, Sho Sato
  • Publication number: 20140320685
    Abstract: An imaging apparatus, comprising a sensor array in which a plurality of sensors are arrayed, a first readout unit configured to read out, from each of the plurality of sensors, a first signal corresponding to an amount of one of an electron and a hole of each of electron-hole pairs generated in the sensor array in response to irradiation with radiation or light, and a second readout unit configured to read out, from each of the plurality of sensors, a second signal corresponding to an amount of the other of the electron and the hole of the electron-hole pairs.
    Type: Application
    Filed: April 14, 2014
    Publication date: October 30, 2014
    Inventors: Katsuro Takenaka, Toshio Kameshima, Tomoyuki Yagi, Sho Sato, Atsushi Iwashita, Eriko Sato, Hideyuki Okada, Takuya Ryu
  • Patent number: 8847138
    Abstract: An imaging apparatus includes a detector having a plurality of conversion elements for converting radiation or light into an electric charge, a power supply unit that supplies a first voltage to the conversion element in a first imaging operation, and a control unit that controls the detector and the power supply unit. During a period between the first imaging operation and a second imaging operation, the control unit controls to perform a first inter-imaging operation in which a second voltage different from the first voltage is supplied to the conversion element, and, subsequently to the first inter-imaging operation, a second inter-imaging operation in which a third voltage different from the first and the second voltages is supplied to the conversion element. The absolute value of the difference between the third and the first voltages is smaller than the absolute value of the difference between the second and the first voltages.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: September 30, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eriko Sugawara, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Hideyuki Okada
  • Publication number: 20140285689
    Abstract: An imaging system comprises: a plurality of pixels each for converting light, converted from radiation by a conversion unit, into an electrical signal; an extracting unit that extracts, based on an image formed based on output signals from the pixels, a pixel with noise generated by the radiation that has transmitted through the conversion unit to arrive at the pixels; and a correcting unit that performs correction to remove the noise with respect to an output signal from the extracted pixel, wherein the extracting unit extracts the pixel with the noise by performing division between first and second images, the first image being formed based on the output signals from the pixels in accordance with the radiation to the conversion unit during a first period, the second image being formed based on these output signals in accordance with that radiation during a second period after the first period.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 25, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takuya Ryu, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Eriko Sato, Hideyuki Okada
  • Publication number: 20140284491
    Abstract: A radiation image pickup system includes a correction coefficient calculation unit that calculates a correction coefficient using pixel output values of a plurality of pixels, and a correction unit that corrects pixel output values of a plurality of pixels using the correction coefficient. A drive control unit repeatedly resets an electric charge caused by a dark current of a plurality of pixels until a detection unit detects a start of radiation exposure. The reset operation is performed simultaneously for n rows that are not adjacent to each other, where n is an integer equal to or greater than 2. The correction coefficient calculation unit calculates the correction coefficient using pixel output values of pixels in a row subjected to the reset operation in a period from a start of radiation exposure to a start detection time and pixel output values of pixels in an adjacent row.
    Type: Application
    Filed: March 18, 2014
    Publication date: September 25, 2014
    Inventors: Sho Sato, Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Hideyuki Okada, Atsushi Iwashita, Eriko Sato, Takuya Ryu
  • Publication number: 20140264060
    Abstract: A radiation image pickup apparatus includes a pixel array including a plurality of pixels arranged in a matrix and configured to convert a radiant ray into electric signals, signal processors configured to output digital signals obtained in accordance with the electric signals output from the pixel array in parallel, and a controller configured to operate the signal processors after the signal processors enter a second power consumption state in which power consumption is higher than that of a first power consumption state from the first power consumption state after irradiation of a radiant ray to the pixel array is terminated, and to cause the signal processors to output digital signals after the signal processors are operated.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshio Kameshima, Tomoyuki Yagi, Katsuro Takenaka, Sho Sato, Atsushi Iwashita, Eriko Sato, Hideyuki Okada, Takuya Ryu, Kosuke Terui