Patents by Inventor Kazuaki Umekawa

Kazuaki Umekawa 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: 12102468
    Abstract: A radiation imaging apparatus comprising a detection unit in which a plurality of pixels are arranged, a communication unit configured to receive a control signal including an imaging mode for acquiring a radiation image by the detection unit and a controller is provided. The controller operates the detection unit in an imaging mode corresponding to the control signal if an imaging instruction is received in a first state in which a state of communication is normal, operates the detection unit in an abnormal imaging mode set in advance if the imaging instruction is received in a second state in which the state of communication is not normal, and operates the detection unit so as to acquire offset image data for an imaging mode different from the abnormal imaging mode while radiation irradiation is not performed in the second state.
    Type: Grant
    Filed: January 19, 2022
    Date of Patent: October 1, 2024
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Kazuaki Umekawa
  • Patent number: 12082967
    Abstract: A radiation imaging system comprising a radiation imaging apparatus in which pixels are arranged, a radiation source, a display unit, and a controller is provided. The controller causes, during radiation irradiation, the radiation imaging apparatus to repeat a generation operation of generating one image data by causing the pixels to perform an accumulating operation and a readout operation. When it is instructed to terminate the radiation irradiation, the controller causes the radiation source to stop the radiation irradiation in accordance with completion of the accumulating operation and the readout operation of the last row in the generation operation during which it was instructed to terminate the radiation irradiation, and causes the display unit to display an image based on last image data generated by the generation operation during which it was instructed to terminate the radiation irradiation.
    Type: Grant
    Filed: January 31, 2022
    Date of Patent: September 10, 2024
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoshi Kamei, Shimpei Tezuka, Kazuaki Umekawa
  • Publication number: 20240138799
    Abstract: A radiographic imaging apparatus includes a plurality of pixels configured to convert radiation to electrical signals and a control section configured to determine an image capturing condition based on the electrical signals converted by the pixels and to start image capturing.
    Type: Application
    Filed: November 1, 2023
    Publication date: May 2, 2024
    Inventors: KAZUAKI UMEKAWA, KATSURO TAKENAKA, HIROYUKI TANAKA
  • Publication number: 20220338831
    Abstract: A radiation imaging apparatus includes a pixel array including, in an imaging region where a plurality of pixels is arranged in a matrix, a detection pixel group in which a plurality of detection pixels is arranged in a row direction, and a control unit configured to control imaging. A grid having a stripe structure in which a radiation transmissive layer and a radiation absorption layer that are strip-shaped and extend in a first direction are alternately arranged in a second direction is disposed and can be used in the radiation imaging apparatus. The radiation imaging apparatus further includes a determination unit configured to determine whether a mode in which the imaging using signals from the detection pixel group is controlled is executable by the control unit, based on information about an angle between the row direction and the first direction.
    Type: Application
    Filed: April 13, 2022
    Publication date: October 27, 2022
    Inventor: Kazuaki Umekawa
  • Publication number: 20220257208
    Abstract: A radiation imaging system comprising a radiation imaging apparatus in which pixels are arranged, a radiation source, a display unit, and a controller is provided. The controller causes, during radiation irradiation, the radiation imaging apparatus to repeat a generation operation of generating one image data by causing the pixels to perform an accumulating operation and a readout operation. When it is instructed to terminate the radiation irradiation, the controller causes the radiation source to stop the radiation irradiation in accordance with completion of the accumulating operation and the readout operation of the last row in the generation operation during which it was instructed to terminate the radiation irradiation, and causes the display unit to display an image based on last image data generated by the generation operation during which it was instructed to terminate the radiation irradiation.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 18, 2022
    Inventors: Satoshi Kamei, Shimpei Tezuka, Kazuaki Umekawa
  • Publication number: 20220257207
    Abstract: A radiation imaging apparatus comprising a detection unit in which a plurality of pixels are arranged, a communication unit configured to receive a control signal including an imaging mode for acquiring a radiation image by the detection unit and a controller is provided. The controller operates the detection unit in an imaging mode corresponding to the control signal if an imaging instruction is received in a first state in which a state of communication is normal, operates the detection unit in an abnormal imaging mode set in advance if the imaging instruction is received in a second state in which the state of communication is not normal, and operates the detection unit so as to acquire offset image data for an imaging mode different from the abnormal imaging mode while radiation irradiation is not performed in the second state.
    Type: Application
    Filed: January 19, 2022
    Publication date: August 18, 2022
    Inventor: Kazuaki Umekawa
  • Patent number: 11399796
    Abstract: Provided is a technology with which defective pixel information in taking a radiation image and defective pixel information in detecting a dose can be generated efficiently. Provided is a radiation imaging apparatus including: a plurality of pixels arranged to convert radiation into an electric signal; and a generation unit configured to generate, based on the electric signal obtained as a result of a conversion by the plurality of pixels, first defective pixel information indicating a defective pixel in taking a radiation image among the plurality of pixels, and second defective pixel information indicating a defective pixel in detecting a dose among the plurality of pixels.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: August 2, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazuaki Umekawa
  • Patent number: 10856834
    Abstract: A radiation imaging apparatus acquires image data by detecting radiation emitted by a radiation generation apparatus, manages a time in the radiation imaging apparatus, generates a synchronization control message to be transmitted to synchronize a time managed by an irradiation control apparatus configured to control radiation irradiation by the radiation generation apparatus with the managed time, and transmits the image data and the synchronization control message, wherein the synchronization control message is transmitted with priority over the image data.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: December 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Akehiko Uchiyama, Kazuaki Umekawa
  • Publication number: 20200252562
    Abstract: Provided is a technology with which defective pixel information in taking a radiation image and defective pixel information in detecting a dose can be generated efficiently. Provided is a radiation imaging apparatus including: a plurality of pixels arranged to convert radiation into an electric signal; and a generation unit configured to generate, based on the electric signal obtained as a result of the conversion by the plurality of pixels, first defective pixel information indicating a defective pixel in taking a radiation image of the plurality of pixels, and second defective pixel information indicating a defective pixel in detecting a dose of the plurality of pixels.
    Type: Application
    Filed: January 28, 2020
    Publication date: August 6, 2020
    Inventor: Kazuaki Umekawa
  • Patent number: 10498975
    Abstract: A radiation imaging apparatus that forms a part of a radiation imaging system is provided. The apparatus includes a sensor unit having a conversion element configured to convert radiation into charges and a switch element configured to transfer the charges. The sensor unit is configured to obtain a radiation image in accordance with radiation that enters the conversion element. The apparatus further includes a control unit configured to control the sensor unit so as to perform one of a plurality of operations. The plurality of operations includes an imaging waiting operation of repetitively switching ON/OFF the switch element, and a standby operation of controlling so as to make a change amount of voltage for controlling the switch element smaller than that of the imaging waiting operation. The control unit executes the standby operation based on a predetermined signal from outside.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: December 3, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shimpei Tezuka, Kazuaki Umekawa
  • Publication number: 20190247003
    Abstract: A radiation imaging apparatus acquires image data by detecting radiation emitted by a radiation generation apparatus, manages a time in the radiation imaging apparatus, generates a synchronization control message to be transmitted to synchronize a time managed by an irradiation control apparatus configured to control radiation irradiation by the radiation generation apparatus with the managed time, and transmits the image data and the synchronization control message, wherein the synchronization control message is transmitted with priority over the image data.
    Type: Application
    Filed: February 7, 2019
    Publication date: August 15, 2019
    Inventors: Akehiko Uchiyama, Kazuaki Umekawa
  • Publication number: 20170272670
    Abstract: A radiation imaging apparatus that forms a part of a radiation imaging system is provided. The apparatus includes a sensor unit having a conversion element configured to convert radiation into charges and a switch element configured to transfer the charges. The sensor unit is configured to obtain a radiation image in accordance with radiation that enters the conversion element. The apparatus further includes a control unit configured to control the sensor unit so as to perform one of a plurality of operations. The plurality of operations includes an imaging waiting operation of repetitively switching ON/OFF the switch element, and a standby operation of controlling so as to make a change amount of voltage for controlling the switch element smaller than that of the imaging waiting operation. The control unit executes the standby operation based on a predetermined signal from outside.
    Type: Application
    Filed: February 27, 2017
    Publication date: September 21, 2017
    Inventors: Shimpei Tezuka, Kazuaki Umekawa
  • Patent number: 9636014
    Abstract: Provided is an ophthalmologic apparatus capable of executing accurate automatic alignment even for an eye having an intraocular lens (IOL) implanted therein. The ophthalmologic apparatus includes: an optical system including a light beam projecting unit for projecting a light beam to an eye to be inspected, and a light receiving unit for receiving a reflection light beam from the eye to be inspected; a detecting unit for detecting a plurality of bright spot images from the reflection light beam received by the light receiving unit; and a calculating unit for calculating an alignment status between the eye to be inspected and the optical system based on the detected plurality of bright spot images. The ophthalmologic apparatus is further provided with a selection unit for selecting bright spot images to be used for the calculation by the calculating unit, from among the plurality of bright spot images.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: May 2, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazuaki Umekawa, Hiroshi Itoh, Wataru Sakagawa
  • Patent number: 9480395
    Abstract: Provisioned is a selecting unit configured to select a bright spot image corresponding to a reflected light beam reflected by the cornea of the subject eye from among a plurality of bright spot images on the basis of a positional relationship between a first bright spot image formed from a plurality of bright spot images corresponding to a first light beam in a first direction and a second bright spot image corresponding to a second light beam in a second direction different than the first direction, and a calculating unit configured to calculate a state of alignment between the subject eye and a measuring unit using the bright spot image selected from the first bright spot images.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: November 1, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazuaki Umekawa
  • Patent number: 9089295
    Abstract: An ophthalmic apparatus comprises an imaging unit configured to capture an anterior eye part image of an eye to be examined, a measuring unit configured to measure unique information of the eye, a calculation unit configured to calculate variations of a plurality of pieces of unique information measured by the measuring unit, and a display control unit configured to cause a display unit to display a plurality of anterior eye part images respectively corresponding to the plurality of pieces of unique information when variations calculated by the calculation unit satisfy a predetermined condition.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: July 28, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazuaki Umekawa
  • Patent number: 9089290
    Abstract: An ophthalmologic apparatus includes a projection unit configured to project a light flux to a subject's eye, an imaging optical system configured to form an image of the light flux reflected by the subject's eye or an image of the subject's eye on an imaging plane, an imaging unit provided on the imaging plane of the imaging optical system, a determination unit configured to determine a parameter regarding the imaging unit or the projection unit for acquiring unique information of the subject's eye based on a physical property of the subject's eye, and an acquisition unit configured to acquire the unique information based on the image of the light flux or the image of the subject's eye captured by the imaging unit with use of the determined parameter.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: July 28, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuaki Umekawa, Tomoyuki Ikegami
  • Patent number: 8985773
    Abstract: Provided is an ophthalmologic apparatus that can perform the alignment of an acquiring unit with respect to an eye to be inspected without a rotation operation so that operability can be improved. The ophthalmologic apparatus includes: an acquiring unit which acquires specific information of an eye to be inspected; a joystick which can perform a rotation motion for moving the acquiring unit in an up-down direction, a left-right tilting motion for moving the acquiring unit in a left-right direction with respect to the eye to be inspected, and a front-back tilting motion for moving the acquiring unit in a front-back direction with respect to the eye to be inspected; and a control unit which changes a motion for moving the acquiring unit in the up-down direction from the rotation motion to the front-back tilting motion.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazuaki Umekawa
  • Publication number: 20140313485
    Abstract: Provisioned is a selecting unit configured to select a bright spot image corresponding to a reflected light beam reflected by the cornea of the subject eye from among a plurality of bright spot images on the basis of a positional relationship between a first bright spot image formed from a plurality of bright spot images corresponding to a first light beam in a first direction and a second bright spot image corresponding to a second light beam in a second direction different than the first direction, and a calculating unit configured to calculate a state of alignment between the subject eye and a measuring unit using the bright spot image selected from the first bright spot images.
    Type: Application
    Filed: April 15, 2014
    Publication date: October 23, 2014
    Inventor: Kazuaki Umekawa
  • Publication number: 20140111766
    Abstract: An ophthalmologic apparatus includes a projection unit configured to project a light flux to a subject's eye, an imaging optical system configured to form an image of the light flux reflected by the subject's eye or an image of the subject's eye on an imaging plane, an imaging unit provided on the imaging plane of the imaging optical system, a determination unit configured to determine a parameter regarding the imaging unit or the projection unit for acquiring unique information of the subject's eye based on a physical property of the subject's eye, and an acquisition unit configured to acquire the unique information based on the image of the light flux or the image of the subject's eye captured by the imaging unit with use of the determined parameter.
    Type: Application
    Filed: October 16, 2013
    Publication date: April 24, 2014
    Applicant: Canon Kabushiki Kaisha
    Inventors: Kazuaki Umekawa, Tomoyuki Ikegami
  • Publication number: 20140028978
    Abstract: In order to automatically determine whether an eye to be inspected is an IOL eye by using bright spot images on a cornea for inspection at high accuracy, an ophthalmologic apparatus is provided with: a light beam projecting unit for projecting a light beam on the cornea of the eye to be inspected; a light receiving unit including an image pickup element for receiving a reflection light beam obtained by reflection of the light beam projected by the projecting unit to obtain cornea bright spot images from the cornea of the eye to be inspected; and an IOL eye determining unit for determining whether the eye to be inspected is the IOL eye based on the cornea bright spot images received by the light receiving unit.
    Type: Application
    Filed: July 25, 2013
    Publication date: January 30, 2014
    Inventors: Wataru Sakagawa, Kazuaki Umekawa, Hiroshi Itoh