Patents by Inventor Jun Kawanabe
Jun Kawanabe 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: 20230384464Abstract: An apparatus includes a plurality of pixels each including a conversion element, and a shielding layer covering the conversion element, wherein the shielding layer is provided to cover at least a part of an aperture of the conversion element so that an aperture modulated transfer function (MTF) at a predetermined frequency of a signal obtained from the conversion element becomes less than or equal to a predetermined value.Type: ApplicationFiled: May 24, 2023Publication date: November 30, 2023Inventors: TSUYOSHI KOBAYASHI, TAKANORI TAYA, JUN KAWANABE
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Patent number: 11831813Abstract: In a period between an operation for acquiring signals for an image via an amplification unit and an operation for acquiring offset signals for correcting the image via the amplification unit, a current supply capability of the amplification unit is made equal to a current supply capability in a period immediately before the image is acquired, thereby the potential state of a signal line when the signals for the image are acquired and the potential state when the offset signals for correcting the image are acquired are matched, and an artifact when the correction is made is reduced.Type: GrantFiled: November 24, 2021Date of Patent: November 28, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Jun Kawanabe, Ryosuke Miura
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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: 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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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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Patent number: 11368640Abstract: An imaging apparatus includes a pixel region including a plurality of pixels, and bias wiring laid on a light incident side of pixels to supply a bias from a power supply to the pixels in the pixel region via a second side defining the pixel region. The bias wiring includes first wiring portions and second wiring portions laid around the pixels. The first wiring portions are laid in a Y direction away from the second side, and the second wiring portions are laid in an X direction orthogonal to the Y direction. The first wiring portions include a light non-transmissive member. A resistance of the first wiring portion per pixel is smaller than that of the second wiring portion per pixel. A loss of light due to the second wiring portion is smaller than that of the light incident due to the first wiring portion.Type: GrantFiled: December 10, 2019Date of Patent: June 21, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Sho Sato
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Publication number: 20220174227Abstract: In a period between an operation for acquiring signals for an image via an amplification unit and an operation for acquiring offset signals for correcting the image via the amplification unit, a current supply capability of the amplification unit is made equal to a current supply capability in a period immediately before the image is acquired, thereby the potential state of a signal line when the signals for the image are acquired and the potential state when the offset signals for correcting the image are acquired are matched, and an artifact when the correction is made is reduced.Type: ApplicationFiled: November 24, 2021Publication date: June 2, 2022Inventors: Jun Kawanabe, Ryosuke Miura
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Publication number: 20220075085Abstract: 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: ApplicationFiled: November 12, 2021Publication date: March 10, 2022Inventors: Jun Kawanabe, Kentaro Fujiyoshi
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Patent number: 11083430Abstract: The present invention provides a technique advantageous in suitably determining the irradiation end timing in a radiation imaging apparatus that can perform AEC. The radiation imaging apparatus comprises a sensor configured to detect radiation and a control unit, wherein the control unit generates, after the start of radiation irradiation, an evaluation value indicating the stability of a radiation irradiation intensity based on a sensor signal from the sensor, and the control unit outputs, in response to the evaluation value satisfying a predetermined condition, a signal indicating that the radiation irradiation intensity has stabilized.Type: GrantFiled: November 4, 2019Date of Patent: August 10, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Sho Sato, Minoru Watanabe, Keigo Yokoyama, Kentaro Fujiyoshi, Jun Kawanabe
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Publication number: 20210141105Abstract: An apparatus comprises a plurality of pixels each including a conversion element and a switch, a driving circuit configured to control the switches via drive lines, a bias power supply unit configured to supply a bias potential to the conversion element via a bias line, column signal lines to which signals are output from the plurality of pixels, and a detection unit. The plurality of pixels include a first pixel and a second pixel, which are adjacent to each other in the row direction and are connected to a common column signal line. The switch of the first pixel and the switch of the second pixel are connected to drive lines different from each other. The detection unit determines presence/absence of radiation irradiation based on a current flowing to the bias line.Type: ApplicationFiled: November 5, 2020Publication date: May 13, 2021Inventors: Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Minoru Watanabe, Kai Suzuki, Hideyuki Okada
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Patent number: 10921466Abstract: A radiation imaging apparatus includes a first detection pixel including a first switch element, a second detection pixel including a second switch element and having sensitivity which is different from that of the first detection pixel, a first signal line, a second signal line, a reading circuit which performs a first operation of reading first and second signals which appear in the first and second signal lines in a state in which the first and second switch elements are in a non-conductive state while the radiation imaging apparatus is irradiated with a radial ray and a second operation of reading third and fourth signals which appear in the first and second signal lines when the first and second switch elements are brought into a conductive state, and an information processing circuit which performs a process of generating information based on the first to fourth signals.Type: GrantFiled: June 28, 2019Date of Patent: February 16, 2021Assignee: Canon Kabushiki KaishaInventors: Ryosuke Miura, Minoru Watanabe, Keigo Yokoyama, Masato Ofuji, Kentaro Fujiyoshi, Jun Kawanabe, Sho Sato, Kazuya Furumoto
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Patent number: 10729393Abstract: A radiographic imaging apparatus includes a pixel, a readout unit, and a signal processing unit. The pixel includes a switch configured to connect a conversion element configured to convert radiation into an electric signal to a signal line. The readout unit is configured to perform a first operation of reading out a first signal appearing in the signal line when the switch is not in a conductive state and a second operation of reading out a second signal appearing in the signal line when the switch is in a conductive state. The read out unit is configured to perform the first operation before performing the second operation a plurality of times consecutively. The signal processing unit is configured to perform signal processing for outputting information indicating irradiation of the radiographic imaging apparatus by the radiation based on the first signal and the second signal.Type: GrantFiled: November 20, 2017Date of Patent: August 4, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Fujiyoshi, Minoru Watanabe, Keigo Yokoyama, Masato Ofuji, Jun Kawanabe, Sho Sato, Kazuya Furumoto, Ryosuke Miura
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Publication number: 20200213543Abstract: An imaging apparatus includes a pixel region including a plurality of pixels, and bias wiring laid on a light incident side of pixels to supply a bias from a power supply to the pixels in the pixel region via a second side defining the pixel region. The bias wiring includes first wiring portions and second wiring portions laid around the pixels. The first wiring portions are laid in a Y direction away from the second side, and the second wiring portions are laid in an X direction orthogonal to the Y direction. The first wiring portions include a light non-transmissive member. A resistance of the first wiring portion per pixel is smaller than that of the second wiring portion per pixel. A loss of light due to the second wiring portion is smaller than that of the light incident due to the first wiring portion.Type: ApplicationFiled: December 10, 2019Publication date: July 2, 2020Inventors: Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Sho Sato
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Patent number: 10634800Abstract: A radiation imaging apparatus comprises a sensor portion including a pixel array configured to acquire an image signal corresponding to radiation, and a plurality of detection elements arranged in the pixel array and configured to detect the radiation, and a readout circuit configured to read out the image signal from the sensor portion, wherein the readout circuit includes a signal processing circuit arranged to combine and process signals from the plurality of detection elements if determining the presence or absence of radiation irradiation, and to process a signal for each detection element or combine and process signals from a number of detection elements from among the plurality of detection elements, the number being less than the number of detection elements that include the plurality of detection elements, if determining a radiation dose.Type: GrantFiled: April 16, 2018Date of Patent: April 28, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Keigo Yokoyama, Minoru Watanabe, Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Hiroshi Wayama
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Publication number: 20200060639Abstract: The present invention provides a technique advantageous in suitably determining the irradiation end timing in a radiation imaging apparatus that can perform AEC. The radiation imaging apparatus comprises a sensor configured to detect radiation and a control unit, wherein the control unit generates, after the start of radiation irradiation, an evaluation value indicating the stability of a radiation irradiation intensity based on a sensor signal from the sensor, and the control unit outputs, in response to the evaluation value satisfying a predetermined condition, a signal indicating that the radiation irradiation intensity has stabilized.Type: ApplicationFiled: November 4, 2019Publication date: February 27, 2020Inventors: Sho Sato, Minoru Watanabe, Keigo Yokoyama, Kentaro Fujiyoshi, Jun Kawanabe
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Patent number: 10537295Abstract: A radiation imaging apparatus is provided. The apparatus comprises pixels arranged in an image sensing region, a first and a second detecting elements configured to obtain radiation irradiation information, a first signal line to which a signal from the first detecting element is to be output and a second signal line to which a signal from the second detecting element is to be output, and a signal processing circuit configured to process the signals output from the first and the second detecting elements. The first the second signal lines are arranged in the image sensing region or arranged adjacent to the image sensing region, the first detecting element has a larger region to detect radiation than the second detecting element. The signal processing circuit generates the radiation irradiation information based on the signals from the first and the second signal lines.Type: GrantFiled: March 31, 2016Date of Patent: January 21, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Minoru Watanabe, Keigo Yokoyama, Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Hiroshi Wayama, Kazuya Furumoto
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Patent number: 10499872Abstract: An apparatus includes a plurality of detection pixels configured to generate a signal according to a radiation irradiation amount to obtain radiation irradiation information, a detection unit configured to correspond to a region of the plurality of detection pixels and detect one of light, pressure, capacitance, and temperature as two-dimensional information, and a control unit configured to determine a monitoring target detection pixel and a non-monitoring-target detection pixel among the plurality of detection pixels based on the two-dimensional information detected by the detection unit, read the signals of detection pixels of a row in which the monitoring target detection pixel is included.Type: GrantFiled: November 2, 2016Date of Patent: December 10, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Masato Ofuji, Minoru Watanabe, Keigo Yokoyama, Jun Kawanabe, Kazuya Furumoto
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Patent number: 10473801Abstract: A radiation imaging apparatus including conversion elements acquiring a radiation image and detectors, a readout unit and a controller is provided. In a first operation, the controller causes the readout unit to output a composition signal obtained by composing signals from the detectors, detects irradiation with radiation based on the composition signal, and shifts to a second operation. In the second operation, the controller acquires first signals individually read out from the detectors, decides a signal component, of the composition signal, which is output from a selected detector of the detectors in accordance with a ratio of the first signal from the selected detector to a sum of the first signals, and acquires an integrated dose of radiation incident on the selected detector based on the signal component and the first signal of the selected detector.Type: GrantFiled: May 3, 2018Date of Patent: November 12, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Jun Kawanabe, Minoru Watanabe, Keigo Yokoyama, Sho Sato, Kentaro Fujiyoshi
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Publication number: 20190324156Abstract: A radiation imaging apparatus includes a first detection pixel including a first switch element, a second detection pixel including a second switch element and having sensitivity which is different from that of the first detection pixel, a first signal line, a second signal line, a reading circuit which performs a first operation of reading first and second signals which appear in the first and second signal lines in a state in which the first and second switch elements are in a non-conductive state while the radiation imaging apparatus is irradiated with a radial ray and a second operation of reading third and fourth signals which appear in the first and second signal lines when the first and second switch elements are brought into a conductive state, and an information processing circuit which performs a process of generating information based on the first to fourth signals.Type: ApplicationFiled: June 28, 2019Publication date: October 24, 2019Inventors: Ryosuke Miura, Minoru Watanabe, Keigo Yokoyama, Masato Ofuji, Kentaro Fujiyoshi, Jun Kawanabe, Sho Sato, Kazuya Furumoto
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Patent number: 10326948Abstract: A radiation imaging apparatus includes a plurality of pixels, each of which includes a conversion element and a transistor, a plurality of drive lines connected to gates of the transistors, a drive circuit unit configured to supply a voltage to the plurality of drive lines, and a control unit configured to control the drive circuit unit. The control unit performs control of causing the drive circuit unit to apply a different voltage that is between the OFF voltage and the ON voltage and is different from the OFF voltage and the ON voltage to the plurality of drive lines in a different period different from a period in which storage control is performed and a period in which read control is performed.Type: GrantFiled: April 13, 2016Date of Patent: June 18, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Hiroshi Wayama, Minoru Watanabe, Keigo Yokoyama, Masato Ofuji, Jun Kawanabe, Kentaro Fujiyoshi, Kazuya Furumoto