Patents by Inventor Kentaro Fujiyoshi

Kentaro Fujiyoshi 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: 20240019595
    Abstract: A radiation imaging apparatus includes a sensor substrate having a plurality of imaging pixels used to capture a radiation image and a detection pixel used to detect radiation; and a housing which accommodates the sensor substrate, wherein the sensor substrate includes an arrangement prohibited region including a stress concentration portion where a stress concentrates due to deformation of the housing, and the detection pixel is arranged in a region different from the arrangement prohibited region.
    Type: Application
    Filed: August 2, 2023
    Publication date: January 18, 2024
    Inventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi
  • Patent number: 11815637
    Abstract: A radiation imaging apparatus includes a sensor substrate having a plurality of imaging pixels used to capture a radiation image and a detection pixel used to detect radiation; and a housing which accommodates the sensor substrate, wherein the sensor substrate includes an arrangement prohibited region including a stress concentration portion where a stress concentrates due to deformation of the housing, and the detection pixel is arranged in a region different from the arrangement prohibited region.
    Type: Grant
    Filed: March 4, 2022
    Date of Patent: November 14, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi
  • Patent number: 11815635
    Abstract: A radiographic apparatus includes a plurality of pixel groups, bias sources, and a sensing unit, wherein each pixel group includes a pixel including a conversion element for converting radiation into a charge. Each bias source supplies a bias potential to the conversion element of a pixel via a bias line. The sensing unit samples a first signal value indicating a current flowing through a first bias line connected to a first pixel group including a pixel of which a switch element is turned on and a second signal value indicating a current flowing through a second bias line connected to a second pixel group where the switch element is off at timings overlapping at least in part and determines presence or absence of radiation irradiation based on the first signal value and the second signal value. The first and second bias lines have substantially same time constants.
    Type: Grant
    Filed: May 4, 2022
    Date of Patent: November 14, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryunosuke Bannai, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Shuichi Fujita
  • Patent number: 11789165
    Abstract: A difference in wiring capacitance between bias lines is reduced by equalizing, for pixels A connected to a signal line from a first direction and pixels B connected to the signal line from a second direction, the numbers of the pixels A and the pixels B where the pixels A and the pixels B are each connected to the corresponding bias line.
    Type: Grant
    Filed: December 16, 2021
    Date of Patent: October 17, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Kawanabe, Masato Ofuji, Kentaro Fujiyoshi
  • Patent number: 11765313
    Abstract: A radiation image capturing apparatus includes, as a plurality of pixels two-dimensionally arranged in an image capturing area, a plurality of image pixels configured to output electric signals for acquiring a radiation image and a plurality of detection pixels configured to output electric signals for detecting information about irradiation of the image capturing area with the irradiation. The plurality of detection pixels is arranged as a line-shaped detection pixel group in the image capturing area, and a plurality of detection driving lines is connected to the line-shaped detection pixel group. A readout circuit reads out, at different timings, the electric signals group by group to each of which a different one of the plurality of detection driving lines is connected in the line-shaped detection pixel group.
    Type: Grant
    Filed: June 24, 2022
    Date of Patent: September 19, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoru Sawada, Kentaro Fujiyoshi
  • Patent number: 11733403
    Abstract: A radiographic imaging apparatus comprising pixels, a drive circuit configured to control the pixels through drive lines and a detection unit configured to detect a start of radiation irradiation is provided. The drive circuit comprises a shift circuit configured to perform a shift operation of changing the drive line to be activated, among the drive lines, in response to a shift control signal input to the drive circuit. The drive circuit has a mode of activating a second drive line among the drive lines in response to the shift control signal input for a second time after a first drive line among the drive lines is activated during a period up to when the detection unit detects the start of radiation irradiation, at least two drive lines of the drive lines being disposed between the first drive line and the second drive line.
    Type: Grant
    Filed: March 30, 2022
    Date of Patent: August 22, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Ryunosuke Bannai, Shuichi Fujita
  • Publication number: 20230258828
    Abstract: A radiation imaging apparatus comprising pixels, a driver controlling the pixels via driving lines, a readout circuit reading out, via column signal lines, signals from the pixels and a detector detecting irradiation information of radiation separately from a radiation image, is provided. Each of the column signal lines is connected to pixels arranged on two pixel columns. The pixels include a first pixel and a second pixel, whose sensitivities are different from each other. The first and second pixels are connected to a common column signal line and are connected to driving lines different from each other. When detecting the irradiation information, the driver drives the first and second pixels at timings different from each other, and the detection circuit detects the irradiation information based on signals output from the first and second pixels.
    Type: Application
    Filed: February 9, 2023
    Publication date: August 17, 2023
    Inventors: RYUNOSUKE BANNAI, TETSUNORI OJIMA, KENTARO FUJIYOSHI, RYOSUKE MIURA
  • Publication number: 20230247170
    Abstract: A radiation imaging apparatus comprising pixels, a driver controlling the pixels via drive lines and a controller, is provided. The driver comprises terminals and performs a shift operation of sequentially outputting an activation signal from each of the terminals in response to first and second signals supplied from the controller. The terminals include a first group that is connected to the drive lines and a second group that is not connected to the drive lines. The first group includes a first terminal output the activation signal first and a second terminal output the activation signal at last. During detecting a start of irradiation, the driver outputs the activation signal from the second terminal in the shift operation according to the first signal and then outputs the activation signal from the first terminal in the shift operation according to the second signal.
    Type: Application
    Filed: January 12, 2023
    Publication date: August 3, 2023
    Inventors: Shuichi Fujita, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Ryunosuke Bannai
  • Patent number: 11693131
    Abstract: A radiation imaging apparatus comprising a first scintillator, a second scintillator which receives radiation transmitted through the first scintillator, conversion elements and a controller is provided. The conversion elements include first conversion elements and second conversion elements with different sensitivities for detecting light emitted from at least one of the first scintillator or the second scintillator. During radiation irradiation, the controller obtains, from a signal output from one or more measuring element configured to measure a dose of incident radiation, a first signal corresponding to light converted from radiation by the second scintillator, and outputs, based on the first signal, a stop signal configured to stop the radiation irradiation, and after the radiation irradiation, the controller causes the first conversion elements and the second conversion elements to output signals configured to generate an energy subtraction image.
    Type: Grant
    Filed: November 12, 2021
    Date of Patent: July 4, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Jun Kawanabe, Kentaro Fujiyoshi
  • Patent number: 11630220
    Abstract: A radiation imaging apparatus includes pixels arranged to form pixel rows and pixel columns. The pixels include first pixels and second pixels whose sensitivity to radiation is lower than the first pixels. The apparatus further includes a signal lines arranged to correspond to the pixel columns, a readout circuit configured to read out a signal from the pixels via the signal lines, and a processing unit configured to decide a correction value using signals read out from the second pixels and correct signals read out from the first pixels using the correction value. An internal structure of the readout circuit has a period. The second pixels are arranged such that there are two or more types of remainders of column numbers of pixel columns that include the second pixels divided by the period.
    Type: Grant
    Filed: June 22, 2022
    Date of Patent: April 18, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
  • Publication number: 20220401054
    Abstract: A radiation imaging system comprises a sensor unit of a radiation imaging device, detecting an incident radiation R irradiated from a radiation generator; an arithmetic unit calculating an accumulated dose of the radiation detected by the sensor unit; and an imaging control unit outputting an irradiation stop signal for stopping the irradiation of the radiation R to the radiation generator when the accumulated dose reaches a threshold or more, wherein the imaging control unit sets the threshold based on a dose rate of the radiation R determined based on a relationship between the accumulated dose and a time, and a delay time from a time of outputting the irradiation stop signal to a time of stopping the irradiation of the radiation of the radiation generator.
    Type: Application
    Filed: August 24, 2022
    Publication date: December 22, 2022
    Inventors: Takanori Taya, Toshikazu Tamura, Sota Torii, Tetsunori Ojima, Kentaro Fujiyoshi
  • Publication number: 20220365232
    Abstract: A radiographic apparatus includes a plurality of pixel groups, bias sources, and a sensing unit, wherein each pixel group includes a pixel including a conversion element for converting radiation into a charge. Each bias source supplies a bias potential to the conversion element of a pixel via a bias line. The sensing unit samples a first signal value indicating a current flowing through a first bias line connected to a first pixel group including a pixel of which a switch element is turned on and a second signal value indicating a current flowing through a second bias line connected to a second pixel group where the switch element is off at timings overlapping at least in part and determines presence or absence of radiation irradiation based on the first signal value and the second signal value. The first and second bias lines have substantially same time constants.
    Type: Application
    Filed: May 4, 2022
    Publication date: November 17, 2022
    Inventors: Ryunosuke Bannai, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Shuichi Fujita
  • Patent number: 11487027
    Abstract: An imaging region including a plurality of detection elements each including a conversion element configured to convert radiation into an electric signal, a first signal line, and a signal processing circuit configured to process a signal output via the first signal line, wherein the plurality of detection elements include a first detection element and a second detection element which are connected to the first signal line, a sensitivity of the first detection element to radiation is set to be different from a sensitivity of the second detection element to radiation, and the signal processing circuit generates information related to irradiation of radiation to the imaging region based on signals from the first detection element and the second detection element which are connected to the first signal line.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: November 1, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Minoru Watanabe, Kentaro Fujiyoshi, Ryosuke Miura
  • Publication number: 20220334272
    Abstract: A radiographic imaging apparatus comprising pixels, a drive circuit configured to control the pixels through drive lines and a detection unit configured to detect a start of radiation irradiation is provided. The drive circuit comprises a shift circuit configured to perform a shift operation of changing the drive line to be activated, among the drive lines, in response to a shift control signal input to the drive circuit. The drive circuit has a mode of activating a second drive line among the drive lines in response to the shift control signal input for a second time after a first drive line among the drive lines is activated during a period up to when the detection unit detects the start of radiation irradiation, at least two drive lines of the drive lines being disposed between the first drive line and the second drive line.
    Type: Application
    Filed: March 30, 2022
    Publication date: October 20, 2022
    Inventors: Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Ishii, Ryunosuke Bannai, Syuichi Fujita
  • Publication number: 20220321805
    Abstract: A radiation image capturing apparatus includes, as a plurality of pixels two-dimensionally arranged in an image capturing area, a plurality of image pixels configured to output electric signals for acquiring a radiation image and a plurality of detection pixels configured to output electric signals for detecting information about irradiation of the image capturing area with the irradiation. The plurality of detection pixels is arranged as a line-shaped detection pixel group in the image capturing area, and a plurality of detection driving lines is connected to the line-shaped detection pixel group. A readout circuit reads out, at different timings, the electric signals group by group to each of which a different one of the plurality of detection driving lines is connected in the line-shaped detection pixel group.
    Type: Application
    Filed: June 24, 2022
    Publication date: October 6, 2022
    Inventors: Satoru Sawada, Kentaro Fujiyoshi
  • Publication number: 20220317319
    Abstract: A radiation imaging apparatus includes pixels arranged to form pixel rows and pixel columns. The pixels include first pixels and second pixels whose sensitivity to radiation is lower than the first pixels. The apparatus further includes a signal lines arranged to correspond to the pixel columns, a readout circuit configured to read out a signal from the pixels via the signal lines, and a processing unit configured to decide a correction value using signals read out from the second pixels and correct signals read out from the first pixels using the correction value. An internal structure of the readout circuit has a period. The second pixels are arranged such that there are two or more types of remainders of column numbers of pixel columns that include the second pixels divided by the period.
    Type: Application
    Filed: June 22, 2022
    Publication date: October 6, 2022
    Inventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
  • Patent number: 11445130
    Abstract: A radiation image capturing apparatus includes, as a plurality of pixels two-dimensionally arranged in an image capturing area, a plurality of image pixels configured to output electric signals for acquiring a radiation image and a plurality of detection pixels configured to output electric signals for detecting information about irradiation of the image capturing area with the irradiation. The plurality of detection pixels is arranged as a line-shaped detection pixel group in the image capturing area, and a plurality of detection driving lines is connected to the line-shaped detection pixel group. A readout circuit reads out, at different timings, the electric signals group by group to each of which a different one of the plurality of detection driving lines is connected in the line-shaped detection pixel group.
    Type: Grant
    Filed: April 19, 2021
    Date of Patent: September 13, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoru Sawada, Kentaro Fujiyoshi
  • Patent number: 11402518
    Abstract: A radiation imaging apparatus includes pixels arranged to form pixel rows and pixel columns. The pixels include first pixels and second pixels whose sensitivity to radiation is lower than the first pixels. The apparatus further includes a signal lines arranged to correspond to the pixel columns, a readout circuit configured to read out a signal from the pixels via the signal lines, and a processing unit configured to decide a correction value using signals read out from the second pixels and correct signals read out from the first pixels using the correction value. An internal structure of the readout circuit has a period. The second pixels are arranged such that there are two or more types of remainders of column numbers of pixel columns that include the second pixels divided by the period.
    Type: Grant
    Filed: June 30, 2021
    Date of Patent: August 2, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
  • Publication number: 20220196857
    Abstract: A difference in wiring capacitance between bias lines is reduced by equalizing, for pixels A connected to a signal line from a first direction and pixels B connected to the signal line from a second direction, the numbers of the pixels A and the pixels B where the pixels A and the pixels B are each connected to the corresponding bias line.
    Type: Application
    Filed: December 16, 2021
    Publication date: June 23, 2022
    Inventors: Jun Kawanabe, Masato Ofuji, Kentaro Fujiyoshi
  • Publication number: 20220196859
    Abstract: A radiation imaging apparatus includes a sensor substrate having a plurality of imaging pixels used to capture a radiation image and a detection pixel used to detect radiation; and a housing which accommodates the sensor substrate, wherein the sensor substrate includes an arrangement prohibited region including a stress concentration portion where a stress concentrates due to deformation of the housing, and the detection pixel is arranged in a region different from the arrangement prohibited region.
    Type: Application
    Filed: March 4, 2022
    Publication date: June 23, 2022
    Inventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi