Patents by Inventor Akihito Otani

Akihito Otani 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: 10699817
    Abstract: A rotary device for a nuclear power facility, the rotary device being placed in a circuit for coolant containing radioactive nuclides in the nuclear power facility. The rotary device includes: a casing; and a rotary mechanism provided with, in the casing, a rotor and a rotor shaft that come into contact with the coolant containing the radioactive nuclides passing through the casing. Regarding the casing and the rotary mechanism, at least the rotor and the rotor shaft of the rotary mechanism comprise a low-effective diffusion coefficient alloy having a lower effective diffusion coefficient than a polycrystalline alloy.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: June 30, 2020
    Assignee: IHI CORPORATION
    Inventors: Xinglong Yan, Akihito Otani, Satoshi Takahashi, Yoshiyuki Imai, Hiroyuki Sato
  • Patent number: 9871279
    Abstract: The millimeter waveband filter includes: a transmission line that is formed by a waveguide which propagates electromagnetic waves with a predetermined frequency range of a millimeter waveband from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting a part thereof. In the electromagnetic waves incident from the one end side of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: January 16, 2018
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Patent number: 9871278
    Abstract: The millimeter waveband filter includes: a transmission line that is formed by a waveguide which propagates electromagnetic waves with a predetermined frequency range of a millimeter waveband from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting a part thereof. In the electromagnetic waves incident from the one end side of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: January 16, 2018
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Patent number: 9793588
    Abstract: A movable waveguide block 50 having transmission lines 51 and 52 slides in a non-contact manner between a first end surface 30b of a first fixing waveguide block 30 having transmission lines 31 and 32 and a second end surface 40a of a second fixing waveguide block 40 having a transmission line 41, and switching of propagation paths is performed. Grooves 35A, 35B, 36A, 36B, 45A, 45B, 55A, 55B, 56A, 56B, 57A, 57B, 58A, and 58B having depths equivalent to ¼ of a guide wavelength of an electromagnetic wave of a leakage prevention object are provided in pairs around openings of the transmission lines 31, 32, 41, 51, and 52 facing each other across a gap between blocks. Accordingly, unintended leakage of electromagnetic waves to the transmission lines via the gap between the blocks is prevented, and isolation increases.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: October 17, 2017
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani
  • Patent number: 9786972
    Abstract: In an end surface 32b of the second transmission line forming body 32 forming a second waveguide 30, the height of a central region 33 which includes an opening of the second transmission line 30b is a reference plane. A depressed portion 32e that is depressed to a depth greater than the length of a thread portion of a screw 205 from the reference plane is provided in a region outside the central region 33 and includes a screw hole forming position. A screw hole 32d for fixing an external circuit 200 to be connected is provided at the screw hole forming position in the depressed portion 32e. The height of a region, which is excluding the depressed portion 32e and is further away from the central region 33 than the screw hole forming position, is equal to the reference plane.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: October 10, 2017
    Assignee: Anritsu Corporation
    Inventors: Takashi Kawamura, Akihito Otani
  • Publication number: 20170148534
    Abstract: A rotary device for a nuclear power facility, the rotary device being placed in a circuit for coolant containing radioactive nuclides in the nuclear power facility. The rotary device includes: a casing; and a rotary mechanism provided with, in the casing, a rotor and a rotor shaft that come into contact with the coolant containing the radioactive nuclides passing through the casing. Regarding the casing and the rotary mechanism, at least the rotor and the rotor shaft of the rotary mechanism comprise a low-effective diffusion coefficient alloy having a lower effective diffusion coefficient than a polycrystalline alloy.
    Type: Application
    Filed: November 17, 2016
    Publication date: May 25, 2017
    Applicant: IHI CORPORATION
    Inventors: Xinglong YAN, Akihito OTANI, Satoshi TAKAHASHI, Yoshiyuki IMAI, Hiroyuki SATO
  • Patent number: 9389255
    Abstract: An input signal Sx in a first millimeter-wave frequency band higher than 100 GHz is input to a millimeter-wave band filter 20 in which a pair of radio wave half mirrors 30A and 30B so as to opposite to each other and which performs a resonance operation. A signal component Sa corresponding to the resonance frequency of the filter is extracted, is mixed with a first local signal L1 with a fixed frequency, and is converted into a signal in a second frequency band. The converted signal component Sb is mixed with a second local signal L2 whose frequency is swept and is converted into a signal in a predetermined intermediate frequency band. Then, the level of the signal is detected. The millimeter-wave filter 20 has high selectivity characteristics in a frequency domain higher than 100 GHz and can change its passband center frequency.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: July 12, 2016
    Assignee: ANRITSU CORPORATION
    Inventors: Masaaki Fuse, Akihito Otani, Hitoshi Sekiya
  • Patent number: 9385407
    Abstract: A radio-wave half mirror for millimeter waveband is fixed inside a transmission line propagating electromagnetic waves of millimeter waveband in a single mode so as to transmit a part of incident electromagnetic waves and reflect a part thereof. The radio-wave half mirror includes: a half mirror body where a slit for transmitting electromagnetic waves is provided on a metal plate; and a dielectric plate that is provided on one surface side of the half mirror body so as to form a dielectric resonator which resonates at a frequency determined by the thickness and the permittivity, and has a transmittance characteristic having a degree of inclination substantially the same as that of the half mirror body in a slope which is inverse to a slope of a transmittance characteristic of the half mirror body in a desired frequency range of the millimeter waveband.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: July 5, 2016
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani
  • Publication number: 20160172731
    Abstract: A movable waveguide block 50 having transmission lines 51 and 52 slides in a non-contact manner between a first end surface 30b of a first fixing waveguide block 30 having transmission lines 31 and 32 and a second end surface 40a of a second fixing waveguide block 40 having a transmission line 41, and switching of propagation paths is performed. Grooves 35A, 35B, 36A, 36B, 45A, 45B, 55A, 55B, 56A, 56B, 57A, 57B, 58A, and 58B having depths equivalent to ¼ of a guide wavelength of an electromagnetic wave of a leakage prevention object are provided in pairs around openings of the transmission lines 31, 32, 41, 51, and 52 facing each other across a gap between blocks. Accordingly, unintended leakage of electromagnetic waves to the transmission lines via the gap between the blocks is prevented, and isolation increases.
    Type: Application
    Filed: December 10, 2015
    Publication date: June 16, 2016
    Inventors: Takashi Kawamura, Akihito Otani
  • Publication number: 20160020499
    Abstract: In an end surface 32b of the second transmission line forming body 32 forming a second waveguide 30, the height of a central region 33 which includes an opening of the second transmission line 30b is a reference plane. A depressed portion 32e that is depressed to a depth greater than the length of a thread portion of a screw 205 from the reference plane is provided in a region outside the central region 33 and includes a screw hole forming position. A screw hole 32d for fixing an external circuit 200 to be connected is provided at the screw hole forming position in the depressed portion 32e. The height of a region, which is excluding the depressed portion 32e and is further away from the central region 33 than the screw hole forming position, is equal to the reference plane.
    Type: Application
    Filed: July 2, 2015
    Publication date: January 21, 2016
    Inventors: Takashi Kawamura, Akihito Otani
  • Patent number: 9184486
    Abstract: The millimeter waveband filter includes: a transmission line that is formed by a waveguide which propagates electromagnetic waves with a predetermined frequency range of a millimeter waveband from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting a part thereof. In the electromagnetic waves incident from the one end side of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: November 10, 2015
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Patent number: 9160044
    Abstract: A transmission line which allows electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 models formed by a first waveguide and a second waveguide. A resonator is formed by electric wave half mirrors fixed to the first waveguide and the second waveguide. The second waveguide has a structure in which a first transmission line forming body has a plate shape and has a square hole forming the first transmission line formed to pass therethrough from one surface toward an opposite surface, a second transmission line forming body has a plate shape and has a square hole forming the second transmission line formed to pass therethrough from one surface toward an opposite surface, and the first transmission line forming body and the second transmission line forming body are connectable and separable.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: October 13, 2015
    Assignee: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Publication number: 20150263400
    Abstract: The millimeter waveband filter includes: a transmission line that is formed by a waveguide which propagates electromagnetic waves with a predetermined frequency range of a millimeter waveband from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting a part thereof. In the electromagnetic waves incident from the one end side of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line.
    Type: Application
    Filed: May 29, 2015
    Publication date: September 17, 2015
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Publication number: 20150263401
    Abstract: The millimeter waveband filter includes: a transmission line that is formed by a waveguide which propagates electromagnetic waves with a predetermined frequency range of a millimeter waveband from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting a part thereof. In the electromagnetic waves incident from the one end side of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line.
    Type: Application
    Filed: May 29, 2015
    Publication date: September 17, 2015
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Patent number: 8970321
    Abstract: A millimeter waveband filter is provided with a resonator formed by a pair of electric wave half mirrors in a transmission line of a waveguide allowing electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode, and allows frequency components centering on the resonance frequency of the resonator to pass therethrough. A high-pass filter which has a transmission line reduced in size so as to have a cutoff frequency matching an upper limit of a lower rejection band of a filter passband is formed in a transmission line between the end of the waveguide and the electric wave half mirror, thereby increasing the attenuation of the lower rejection band.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: March 3, 2015
    Assignee: Anritsu Corporation
    Inventors: Takashi Kawamura, Akihito Otani
  • Publication number: 20140292305
    Abstract: An input signal Sx in a first millimeter-wave frequency band higher than 100 GHz is input to a millimeter-wave band filter 20 in which a pair of radio wave half mirrors 30A and 30B so as to opposite to each other and which performs a resonance operation. A signal component Sa corresponding to the resonance frequency of the filter is extracted, is mixed with a first local signal L1 with a fixed frequency, and is converted into a signal in a second frequency band. The converted signal component Sb is mixed with a second local signal L2 whose frequency is swept and is converted into a signal in a predetermined intermediate frequency band. Then, the level of the signal is detected. The millimeter-wave filter 20 has high selectivity characteristics in a frequency domain higher than 100 GHz and can change its passband center frequency.
    Type: Application
    Filed: March 14, 2014
    Publication date: October 2, 2014
    Applicant: ANRITSU CORPORATION
    Inventors: Masaaki Fuse, Akihito Otani, Hitoshi Sekiya
  • Publication number: 20140015626
    Abstract: A millimeter waveband filter is provided with a resonator formed by a pair of electric wave half mirrors in a transmission line of a waveguide allowing electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode, and allows frequency components centering on the resonance frequency of the resonator to pass therethrough. A high-pass filter which has a transmission line reduced in size so as to have a cutoff frequency matching an upper limit of a lower rejection band of a filter passband is formed in a transmission line between the end of the waveguide and the electric wave half mirror, thereby increasing the attenuation of the lower rejection band.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 16, 2014
    Inventors: Takashi Kawamura, Akihito Otani
  • Publication number: 20130314179
    Abstract: A transmission line which allows electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 models formed by a first waveguide and a second waveguide. A resonator is formed by electric wave half mirrors fixed to the first waveguide and the second waveguide. The second waveguide has a structure in which a first transmission line forming body has a plate shape and has a square hole forming the first transmission line formed to pass therethrough from one surface toward an opposite surface, a second transmission line forming body has a plate shape and has a square hole forming the second transmission line formed to pass therethrough from one surface toward an opposite surface, and the first transmission line forming body and the second transmission line forming body are connectable and separable.
    Type: Application
    Filed: May 14, 2013
    Publication date: November 28, 2013
    Applicant: ANRITSU CORPORATION
    Inventors: Takashi Kawamura, Akihito Otani, Hiroshi Hasegawa
  • Patent number: 8098995
    Abstract: An electroabsorption optical modulator used as a sampling element has two optical terminals and a power supply terminal, the two optical terminals are used to input and output light, and the power supply terminal imparts an electric field to an optical path connecting the two optical terminals. The electroabsorption optical modulator has a characteristic in which an absorption index is changed with respect to the light beam propagating through the optical path according to a level of the electric field. A monitoring (synchronization sampling) object optical signal is input into one of the two optical terminals of the electroabsorption optical modulator. A predetermined direct-current voltage exhibiting a high absorption index for the monitoring (synchronization sampling) object optical signal is imparted to the power supply terminal of the electroabsorption optical modulator.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: January 17, 2012
    Assignee: Anritsu Corporation
    Inventors: Akihito Otani, Takao Tanimoto
  • Patent number: 8050558
    Abstract: The optical signal sampling apparatus and the optical signal monitor apparatus are configured of an optical combiner for combining an optical signal to be sampled and a sampling light pulse with each other and an electroabsorption modulator. The electroabsorption modulator has two optical terminals for inputting/outputting the light and a power supply terminal for applying the electric field to the optical path connecting the two optical terminals, and has such a characteristic that the absorption rate of the light propagating through the optical path changes in accordance with the magnitude of the electric field, the light emitted from the optical combiner is received by one of the two optical terminals, and the absorption rate is increased when the sampling light pulse is not incident while the absorption rate is decreased when the sampling light pulse is incident.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: November 1, 2011
    Assignee: Anritsu Corporation
    Inventors: Akihito Otani, Takao Tanimoto