Patents by Inventor Mikio Izumi

Mikio Izumi 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: 10102934
    Abstract: A reactor state monitoring apparatus including: a first gamma ray-dose measurement device that detects and measures an atmospheric radiation dose caused by radioactive substances on a containment vessel side respective to a biological shielding wall surrounding a pressure vessel and outside the pressure vessel; a second gamma ray-dose measurement device that detects and measures a radiation dose on the pressure vessel side respective to the biological shielding wall; a fuel radiation measuring device that detects and measures a radiation dose of fuel in the pressure vessel; and a water amount evaluation device that calculates a difference between radiation doses measured by the fuel radiation measuring device and the first gamma ray-dose measurement device as a corrected fuel radiation dose, and acquires a cooling water level as a water level evaluation value, based on the radiation dose measured by the second gamma ray-dose measurement device and the corrected fuel radiation dose.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: October 16, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Mikio Izumi, Hidehiko Kuroda, Yuka Takada, Makoto Takemura, Hiroaki Kenjyo
  • Patent number: 9927536
    Abstract: A radiation detection apparatus includes a selecting unit that allows a light having a light emission wavelength and a polarization direction to pass thorough the selecting unit, an optical system that forms an image of the light, a photon detecting unit that observes the image formed by the optical system, and detects the photon in whole range of the entire image, a counting unit that calculates the number of the alpha rays based on a result of counting the photons derived from the light emission of gas excited by the alpha rays, whereby it is possible to sufficiently eliminate background light (noise light) even if background light is strong, and therefore observe weak light emission.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: March 27, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hidehiko Kuroda, Kunihiko Nakayama, Kei Takakura, Mikio Izumi, Naoto Kume
  • Patent number: 9523776
    Abstract: An embodiment of a radiation detector has: a light collecting member; a photo detector that can receive light collected by the light collecting member and count number of photons; a wavelength selector that can selectively transmit light based on the light emission of gas caused by alpha rays by selectively transmitting light of a wavelength in a specific range; a shielding device that is can switch between an opened state in which it transmits light and a closed state in which it shields light; and a counting unit that calculates an alpha dose based on a difference calculated by subtracting number of noise photons detected in the photo detector within a predetermined time period when the shielding device is in the closed state from the number of photons received by the photo detector within the predetermined time period when the shielding device is opened state.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: December 20, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko Kuroda, Kunihiko Nakayama, Kei Takakura, Mikio Izumi
  • Patent number: 9476861
    Abstract: In order to reduce the variation of transmitting and receiving sensitivity among a plurality of CMUT cells, an ultrasound diagnostic device comprises: a plurality of CMUT cells each having a vibrating membrane that vibrates when ultrasound is transmitted to or received from a subject; an upper electrode and a lower electrode disposed facing each other on mutually opposite sides of each of the CMUT cells to apply a bias voltage to each of the CMUT cells by a bias power supply; and transmitting and receiving correction units for each correcting the voltage supplied from the bias power supply by using a function using at least one parameter of the thickness and resonance frequency of the vibrating membrane of each of the CMUT cells.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: October 25, 2016
    Assignee: HITACHI, LTD.
    Inventors: Tomoko Takenaka, Mikio Izumi, Kazunari Ishida
  • Publication number: 20150323678
    Abstract: An embodiment of a radiation detector has: a light collecting member; a photo detector that can receive light collected by the light collecting member and count number of photons; a wavelength selector that can selectively transmit light based on the light emission of gas caused by alpha rays by selectively transmitting light of a wavelength in a specific range; a shielding device that is can switch between an opened state in which it transmits light and a closed state in which it shields light; and a counting unit that calculates an alpha dose based on a difference calculated by subtracting number of noise photons detected in the photo detector within a predetermined time period when the shielding device is in the closed state from the number of photons received by the photo detector within the predetermined time period when the shielding device is opened state.
    Type: Application
    Filed: September 2, 2014
    Publication date: November 12, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko KURODA, Kunihiko Nakayama, Kei Takakura, Mikio Izumi
  • Publication number: 20150090889
    Abstract: A radiation detection apparatus includes a selecting unit that allows a light having a light emission wavelength and a polarization direction to pass thorough the selecting unit, an optical system that forms an image of the light, a photon detecting unit that observes the image formed by the optical system, and detects the photon in whole range of the image, a counting unit that calculates the number of the alpha ray based on a result of counting the photon derived from the light emission of gas excited by the alpha ray, and is possible to sufficiently eliminate background light (noise light) even if background light is strong, and therefore observe weak light emission.
    Type: Application
    Filed: September 25, 2014
    Publication date: April 2, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko KURODA, Kunihiko NAKAYAMA, Kei TAKAKURA, Mikio IZUMI, Naoto KUME
  • Publication number: 20150036778
    Abstract: A reactor state monitoring apparatus including: a first gamma ray-dose measurement device that detects and measures an atmospheric radiation dose caused by radioactive substances on a containment vessel side respective to a biological shielding wall surrounding a pressure vessel and outside the pressure vessel; a second gamma ray-dose measurement device that detects and measures a radiation dose on the pressure vessel side respective to the biological shielding wall; a fuel radiation measuring device that detects and measures a radiation dose of fuel in the pressure vessel; and a water amount evaluation device that calculates a difference between radiation doses measured by the fuel radiation measuring device and the first gamma ray-dose measurement device as a corrected fuel radiation dose, and acquires a cooling water level as a water level evaluation value, based on the radiation dose measured by the second gamma ray-dose measurement device and the corrected fuel radiation dose.
    Type: Application
    Filed: December 21, 2012
    Publication date: February 5, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Mikio Izumi, Hidehiko Kuroda, Yuka Takada, Makoto Takemura, Hiroaki Kenjyo
  • Publication number: 20150013462
    Abstract: In order to reduce the variation of transmitting and receiving sensitivity among a plurality of CMUT cells, an ultrasound diagnostic device comprises: a plurality of CMUT cells each having a vibrating membrane that vibrates when ultrasound is transmitted to or received from a subject; an upper electrode and a lower electrode disposed facing each other on mutually opposite sides of each of the CMUT cells to apply a bias voltage to each of the CMUT cells by a bias power supply; and transmitting and receiving correction units for each correcting the voltage supplied from the bias power supply by using a function using at least one parameter of the thickness and resonance frequency of the vibrating membrane of each of the CMUT cells.
    Type: Application
    Filed: February 21, 2013
    Publication date: January 15, 2015
    Applicant: HITACHI ALOKA MEDICAL, LTD.
    Inventors: Tomoko Takenaka, Mikio Izumi, Kazunari Ishida
  • Patent number: 8774340
    Abstract: A nuclear reactor vibration surveillance system has a first ultrasonic transducer for transmission, an ultrasonic transmitter, a second ultrasonic transducer for reception, an ultrasonic receiver, a signal processor, and a display unit. The first ultrasonic transducer for transmission is arranged on the outer surface of a reactor pressure vessel and is configured to convert a transmission signal into an ultrasonic pulse signal and allow the ultrasonic pulse to be transmitted to a reactor internal component. The second ultrasonic transducer for reception is arranged on the outer surface of the reactor pressure vessel and is configured to receive a reflected ultrasonic pulse reflected by the reactor internal component and convert the received reflected ultrasonic pulse into a reception signal.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: July 8, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hidehiko Kuroda, Mikio Izumi, Mitsuhiro Enomoto, Masaki Yoda, Mieko Sato
  • Patent number: 8758253
    Abstract: An ultrasonic probe is disclosed which includes a cMUT chip having a plurality of vibration elements whose electromechanical coupling coefficient or sensitivity is changed according to a bias voltage and transmitting and receiving ultrasonic waves, an acoustic lens arranged above the cMUT chip, and a backing layer arranged below the cMUT chip. An electric leakage preventing unit is provided at the ultrasonic wave transmission/reception surface side of the acoustic lens or between the acoustic lens and the cMUT chip. The electric leakage preventing unit can be, for example, an insulating layer such as a ground layer. Such a structure makes it is possible to provide an ultrasonic probe capable of preventing electric leakage from the ultrasonic probe to an object to be examined so as to improve the electric safety and an ultrasonic diagnostic apparatus using the probe.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: June 24, 2014
    Assignee: Hitachi Medical Corporation
    Inventors: Shuzo Sano, Akifumi Sako, Takashi Kobayashi, Mikio Izumi
  • Patent number: 8540640
    Abstract: An ultrasonic probe (2) comprises a cMUT chip (20), which has a plurality of vibration elements whose electromechanical coupling coefficient or the sensitivity changes depending on a bias voltage, and transmits/receives an ultrasonic wave; an acoustic lens (26) provided on the ultrasonic wave radiation side of the cMUT chip (20); a backing layer (22) provided on the back side of the cMUT chip (20) for absorbing propagation of the ultrasonic wave; an electric wiring portion (flexible substrate (72)), which is provided from the peripheral portion of the cMUT chip (20) to the side face of the backing layer (22) and has a signal pattern connected with the electrode of the cMUT chip (20) arranged thereon; and a housing (ultrasonic probe cover (25)) for containing the cMUT chip (20), the acoustic lens (26), the backing layer (22) and the electric wiring portion (flexible substrate (72)).
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: September 24, 2013
    Assignee: Hitachi Medical Corporation
    Inventors: Shuzo Sano, Akifumi Sako, Takashi Kobayashi, Mikio Izumi
  • Patent number: 8044356
    Abstract: A survey meter for measuring a radioactive contamination caused in an inner surface of a pipe includes a radiation detecting section and a signal processing section. The radiation detecting section includes a rod-shaped light guide unit, a reflecting portion connected to one end surface of the light guide unit, a photoelectric transfer unit, for outputting an electronic signal, connected to another one end surface of the light guide unit, and a scintillator unit provided to a circumference of the light guide unit.
    Type: Grant
    Filed: November 12, 2007
    Date of Patent: October 25, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akio Sumita, Syunichiro Makino, Mikio Izumi, Tetsuo Goto
  • Publication number: 20100312119
    Abstract: There is provided an ultrasound probe including a capacitive transducer for reducing multiple reflections while maintaining a pulse characteristic with which a high-quality image can be obtained, and is also provided an ultrasound imaging apparatus using the ultrasound probe. The ultrasound probe including the capacitive transducer is configured so as to satisfy the condition 6.5/fc<?d, where ? [dB/mm/MHz] denotes the absorption coefficient of an acoustic lens, d [mm] denotes the maximum thickness of the acoustic lens, and fc [MHz] denotes the center frequency of the capacitive transducer, and satisfy the condition L<1/((3?fc)2√óC), where L [H] denotes an inductance value per channel of the capacitive transducer, C [pF] denotes a capacitance per channel of the capacitive transducer, and fc [MHz] denotes the center frequency of the capacitive transducer.
    Type: Application
    Filed: November 25, 2008
    Publication date: December 9, 2010
    Inventors: Kunio Hashiba, Mikio Izumi, Katsunori Asafusa
  • Publication number: 20100282975
    Abstract: A survey meter for measuring a radioactive contamination caused in an inner surface of a pipe includes a radiation detecting section and a signal processing section. The radiation detecting section includes a rod-shaped light guide unit, a reflecting portion connected to one end surface of the light guide unit, a photoelectric transfer unit, for outputting an electronic signal, connected to another one end surface of the light guide unit, and a scintillator unit provided to a circumference of the light guide unit.
    Type: Application
    Filed: November 12, 2007
    Publication date: November 11, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akio Sumita, Syunichiro Makino, Mikio Izumi, Tetsuo Goto
  • Patent number: 7774187
    Abstract: A safety protection instrumentation system for a nuclear reactor is constructed by using digital logic. The digital logic includes functional units in which output logic patterns corresponding to all input logic patterns are verified in advance and a functional module formed by combining the functional units.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: August 10, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mikio Izumi, Toshifumi Hayashi, Teruji Tarumi, Shigeru Odanaka, Naotaka Oda, Toshiaki Ito, Toshifumi Sato, Hideyuki Kitazono, Tatsuyuki Maekawa
  • Patent number: 7766838
    Abstract: To miniaturize a probe, increase the channel number, and improve the flexibility of a flexible section, an ultrasound probe includes a transducer unit having a plurality of channels arranged for transmitting and receiving an ultrasound wave, and flexible circuit board is connected to the respective channels of the transducer unit in which a signal line for supplying a transmission signal and extracting a reception signal to/from transducer unit is provided. The flexible circuit board forms at least two channel blocks which are formed by dividing the plurality of channels and are spirally wound individually.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: August 3, 2010
    Assignee: Hitachi Medical Corporation
    Inventors: Tomoyuki Yagi, Takashi Ito, Mikio Izumi
  • Publication number: 20100179430
    Abstract: An ultrasonic probe (2) comprises a cMUT chip (20), which has a plurality of vibration elements whose electromechanical coupling coefficient or the sensitivity changes depending on a bias voltage, and transmits/receives an ultrasonic wave; an acoustic lens (26) provided on the ultrasonic wave radiation side of the cMUT chip (20); a backing layer (22) provided on the back side of the cMUT chip (20) for absorbing propagation of the ultrasonic wave; an electric wiring portion (flexible substrate (72)), which is provided from the peripheral portion of the cMUT chip (20) to the side face of the backing layer (22) and has a signal pattern connected with the electrode of the cMUT chip (20) arranged thereon; and a housing (ultrasonic probe cover (25)) for containing the cMUT chip (20), the acoustic lens (26), the backing layer (22) and the electric wiring portion (flexible substrate (72)).
    Type: Application
    Filed: February 27, 2008
    Publication date: July 15, 2010
    Inventors: Shuzo Sano, Takashi Kobayashi, Mikio Izumi
  • Publication number: 20100067645
    Abstract: A reflector system of a fast reactor according to the present invention comprises a reflector having a neutron reflecting portion reflecting a neutron radiated from a reactor core, and a cavity portion provided above the neutron reflecting portion and having a lower neutron reflecting capacity than a coolant, and a reflector drive apparatus coupled to the reflector and moving the reflector in a vertical direction. The reflector drive apparatus has a driving portion which is coupled to the reflector via a drive shaft, and drives the reflector up and down, and a load sensing portion which is provided between the driving portion and the drive shaft, and senses a load of the reflector. A detecting portion receiving a load signal from the load sensing portion so as to detect a breakage of the cavity portion of the reflector is connected to the load sensing portion.
    Type: Application
    Filed: September 18, 2009
    Publication date: March 18, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshiro SAKAI, Akio TAKAHASHI, Takanari INATOMI, Hiroshi NAKAMURA, Masafumi KOMAI, Mikio IZUMI
  • Patent number: 7678054
    Abstract: An array of a plurality of ultrasonic transducers having a piezoelectric layer 2 and a couple of electrodes 7-1 and 7-2 sandwiching the piezoelectric layer therebetween is provided. The piezoelectric layer 2 has a first piezoelectric layer 2-1 provided on the ultrasonic-wave emission side, a second piezoelectric layer 2-2 provided on the other side of the first piezoelectric layer 2-1, and a common electrode 8 provided therebetween. Each of the ultrasonic transducers has a low-frequency response distribution that is uniform in the minor-axis direction perpendicular to a direction in which the ultrasonic transducers are arranged and a high high-frequency response distribution at a center part in the minor-axis direction. The characteristics of the minor-axis-direction frequency and sound pressure of the first piezoelectric layer are complemented by those of the second piezoelectric layer, whereby a uniform frequency characteristic for a minor-axis-direction low frequency is obtained.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: March 16, 2010
    Assignee: Hitachi Medical Corporation
    Inventors: Hideki Okazaki, Mikio Izumi
  • Patent number: 7669090
    Abstract: An apparatus for verifying a custom IC including a test pattern generating unit for generating a test pattern for verifying a function of the custom IC. The test pattern is output to a master IC and a test IC. The apparatus further includes a comparing unit connected to receive operation signals output from the master IC and the test IC for comparing the operation signals to see if the operation signals are agreed with each other and for generating a comparison signal based on a comparison result, a judging unit connected to receive the comparison signal for judging if there is any abnormality in the test IC and for outputting a judged signal based on a judged result, and a computer connected to receive the judged signal for displaying the judged result of the test IC.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: February 23, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideyuki Kitazono, Toshifumi Sato, Naotaka Oda, Toshiaki Ito, Mikio Izumi