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).
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Publication number: 20240019595Abstract: 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: ApplicationFiled: August 2, 2023Publication date: January 18, 2024Inventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi
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Patent number: 11815637Abstract: 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: GrantFiled: March 4, 2022Date of Patent: November 14, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi
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Patent number: 11815635Abstract: 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: GrantFiled: May 4, 2022Date of Patent: November 14, 2023Assignee: Canon Kabushiki KaishaInventors: Ryunosuke Bannai, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Shuichi Fujita
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Patent number: 11789165Abstract: 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: GrantFiled: December 16, 2021Date of Patent: October 17, 2023Assignee: Canon Kabushiki KaishaInventors: Jun Kawanabe, Masato Ofuji, Kentaro Fujiyoshi
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Patent number: 11765313Abstract: 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: GrantFiled: June 24, 2022Date of Patent: September 19, 2023Assignee: Canon Kabushiki KaishaInventors: Satoru Sawada, Kentaro Fujiyoshi
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Patent number: 11733403Abstract: 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: GrantFiled: March 30, 2022Date of Patent: August 22, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Ryunosuke Bannai, Shuichi Fujita
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Publication number: 20230258828Abstract: 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: ApplicationFiled: February 9, 2023Publication date: August 17, 2023Inventors: RYUNOSUKE BANNAI, TETSUNORI OJIMA, KENTARO FUJIYOSHI, RYOSUKE MIURA
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Publication number: 20230247170Abstract: 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: ApplicationFiled: January 12, 2023Publication date: August 3, 2023Inventors: Shuichi Fujita, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Ryunosuke Bannai
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Patent number: 11693131Abstract: 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: GrantFiled: November 12, 2021Date of Patent: July 4, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Jun Kawanabe, Kentaro Fujiyoshi
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Patent number: 11630220Abstract: 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: GrantFiled: June 22, 2022Date of Patent: April 18, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
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Publication number: 20220401054Abstract: 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: ApplicationFiled: August 24, 2022Publication date: December 22, 2022Inventors: Takanori Taya, Toshikazu Tamura, Sota Torii, Tetsunori Ojima, Kentaro Fujiyoshi
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Publication number: 20220365232Abstract: 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: ApplicationFiled: May 4, 2022Publication date: November 17, 2022Inventors: Ryunosuke Bannai, Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Serizawa, Shuichi Fujita
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Patent number: 11487027Abstract: 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: GrantFiled: July 15, 2020Date of Patent: November 1, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Minoru Watanabe, Kentaro Fujiyoshi, Ryosuke Miura
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Publication number: 20220334272Abstract: 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: ApplicationFiled: March 30, 2022Publication date: October 20, 2022Inventors: Hideyuki Okada, Kentaro Fujiyoshi, Yoshiaki Ishii, Ryunosuke Bannai, Syuichi Fujita
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Publication number: 20220321805Abstract: 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: ApplicationFiled: June 24, 2022Publication date: October 6, 2022Inventors: Satoru Sawada, Kentaro Fujiyoshi
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Publication number: 20220317319Abstract: 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: ApplicationFiled: June 22, 2022Publication date: October 6, 2022Inventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
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Patent number: 11445130Abstract: 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: GrantFiled: April 19, 2021Date of Patent: September 13, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Satoru Sawada, Kentaro Fujiyoshi
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Patent number: 11402518Abstract: 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: GrantFiled: June 30, 2021Date of Patent: August 2, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Takuya Ryu, Kentaro Fujiyoshi, Ryosuke Miura
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Publication number: 20220196857Abstract: 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: ApplicationFiled: December 16, 2021Publication date: June 23, 2022Inventors: Jun Kawanabe, Masato Ofuji, Kentaro Fujiyoshi
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Publication number: 20220196859Abstract: 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: ApplicationFiled: March 4, 2022Publication date: June 23, 2022Inventors: Kentaro Fujiyoshi, Motoki Tagawa, Takahiro Koyanagi