Patents by Inventor Hajime Tanaka

Hajime Tanaka 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).

  • Publication number: 20230057015
    Abstract: The light modulator includes a substrate having a main surface including a first area, a second area, and a third area, a first III-V compound semiconductor layer of a first conductivity-type provided on the first area, a second III-V compound semiconductor layer of a first conductivity-type or a second conductivity-type provided on the second area, a core provided on the third area and including a group III-V compound semiconductor, and an electrode connected to the first III-V compound semiconductor layer. The first III-V compound semiconductor layer includes a first portion having a thickness smaller than a thickness of the core in a second direction orthogonal to the main surface and a second portion having a thickness larger than the thickness of the first portion in the second direction. The second portion is disposed between the first portion and the core.
    Type: Application
    Filed: August 12, 2022
    Publication date: February 23, 2023
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Naoya KONO, Hajime TANAKA, Naoki FUJIWARA
  • Patent number: 11585879
    Abstract: A radio frequency amplifying device according to an embodiment includes load impedance calculating circuitry and controlling circuitry. The load impedance calculating circuitry is configured to calculate a load impedance on the basis of information about a voltage standing wave rate and a phase on an output side of radio frequency amplifying circuitry. The controlling circuitry is configured to adjust a gain and a phase of a signal to be input to the radio frequency amplifying circuitry, in accordance with the load impedance calculated by the load impedance calculating circuitry.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: February 21, 2023
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Masaki Tanji, Susumu Kawaguchi, Hajime Tanaka
  • Patent number: 11378633
    Abstract: A radio frequency amplifying device according to an embodiment includes amplifying circuitry, obtaining circuitry, and correcting circuitry. The amplifying circuitry is configured to output an amplified signal obtained by amplifying a signal input thereto. The obtaining circuitry is configured to obtain an envelope indicating a waveform of a radio frequency signal as digital data. The correcting circuitry is configured to correct the obtained envelope on the basis of a rising characteristic of the amplifying circuitry and to input the signal generated on the basis of the envelope resulting from the correction to the amplifying circuitry.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: July 5, 2022
    Assignee: Canon Medical Systems Corporation
    Inventors: Hiroaki Murakoshi, Susumu Kawaguchi, Masaki Tanji, Hirofumi Yamaki, Hajime Tanaka
  • Patent number: 11353728
    Abstract: An optical modulator includes a waveguide formed of a semiconductor and configured to allow light to propagate therethrough; a first electrode disposed on the waveguide and electrically connected to the waveguide; and a second electrode separated from the waveguide and electrically connected to the waveguide. An edge of the second electrode on a light entry side is located downstream of an edge of the first electrode on the light entry side in a propagation direction of the light.
    Type: Grant
    Filed: August 13, 2020
    Date of Patent: June 7, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hajime Tanaka, Tsutomu Ishikawa, Masataka Watanabe
  • Patent number: 11215757
    Abstract: A spot size converter includes a first waveguide including a first core layer, the first waveguide propagating light; and a second waveguide including a second core layer and provided on the first waveguide, the second waveguide propagating light. The first waveguide and the second waveguide extend in a waveguide direction. A first region and a second region are provided continuously along the waveguide direction. In the first region, the second waveguide has a tapered shape in a cross section which becomes narrower as going up away from the first waveguide. An angle between a side surface of the second waveguide and a bottom surface of the second waveguide is 60° or less.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: January 4, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masataka Watanabe, Hajime Tanaka
  • Patent number: 11048140
    Abstract: An optical modulator includes: a waveguide made of semiconductor, a light being input to one of ends of the waveguide; and a first electrode provided on the waveguide and overlapping with a part of the waveguide, wherein the waveguide has a first region to a third region along a propagation direction of the light from the one of ends, wherein neither the first region nor a part of the second region on a side of the first region in the propagation direction overlaps with the first electrode, wherein the third region and a part of the second region on a side of the third region in the propagation direction overlap with the first electrode, wherein a second width of the second region is larger than a first width of the first region and a third width of the third region.
    Type: Grant
    Filed: November 25, 2019
    Date of Patent: June 29, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hajime Tanaka, Tsutomu Ishikawa
  • Patent number: 11047937
    Abstract: A radio frequency power supply according to an embodiment is a radio frequency power supply that amplifies an input signal including application timing of a radio frequency magnetic field and waveform information and that supplies the amplified input signal to a radio frequency coil. The radio frequency power supply includes an amplifier and a controlling unit. The amplifier amplifies the input signal and to output an amplified signal. The controlling circuity varies power supply voltage used by the amplifier for the amplification of the input signal, in accordance with the input signal.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: June 29, 2021
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Hirofumi Yamaki, Susumu Kawaguchi, Mitsuyuki Murakami, Hisanori Suzuki, Hajime Tanaka
  • Publication number: 20210063513
    Abstract: A radio frequency amplifying device according to an embodiment includes load impedance calculating circuitry and controlling circuitry. The load impedance calculating circuitry is configured to calculate a load impedance on the basis of information about a voltage standing wave rate and a phase on an output side of radio frequency amplifying circuitry. The controlling circuitry is configured to adjust a gain and a phase of a signal to be input to the radio frequency amplifying circuitry, in accordance with the load impedance calculated by the load impedance calculating circuitry.
    Type: Application
    Filed: August 26, 2020
    Publication date: March 4, 2021
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Masaki TANJI, Susumu Kawaguchi, Hajime Tanaka
  • Publication number: 20210055622
    Abstract: An optical modulator includes a waveguide formed of a semiconductor and configured to allow light to propagate therethrough; a first electrode disposed on the waveguide and electrically connected to the waveguide; and a second electrode separated from the waveguide and electrically connected to the waveguide. An edge of the second electrode on a light entry side is located downstream of an edge of the first electrode on the light entry side in a propagation direction of the light.
    Type: Application
    Filed: August 13, 2020
    Publication date: February 25, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hajime TANAKA, Tsutomu ISHIKAWA, Masataka WATANABE
  • Publication number: 20210018682
    Abstract: A spot size converter includes a first waveguide including a first core layer, the first waveguide propagating light; and a second waveguide including a second core layer and provided on the first waveguide, the second waveguide propagating light. The first waveguide and the second waveguide extend in a waveguide direction. A first region and a second region are provided continuously along the waveguide direction. In the first region, the second waveguide has a tapered shape in a cross section which becomes narrower as going up away from the first waveguide. An angle between a side surface of the second waveguide and a bottom surface of the second waveguide is 60° or less.
    Type: Application
    Filed: July 15, 2020
    Publication date: January 21, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masataka WATANABE, Hajime TANAKA
  • Patent number: 10794969
    Abstract: According to one embodiment, an RF circuit includes a directional coupler, processing circuitry, and an adjuster. The directional coupler includes a first port for outputting at least a part of a traveling wave and a second port for outputting at least a part of a reflected wave. The processing circuitry is configured to calculate impedance of a load side that is viewed from the directional coupler, by using a voltage standing wave ratio based on respective outputs from the first port and the second port and a phase of the reflected wave based on an output from the second port. The adjuster is configured to adjust an output from at least one of the first port and the second port based on the impedance calculated by the processing circuitry.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: October 6, 2020
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Masaki Tanji, Hajime Tanaka, Hiroaki Murakoshi
  • Publication number: 20200192132
    Abstract: An optical modulator includes: a waveguide made of semiconductor, a light being input to one of ends of the waveguide; and a first electrode provided on the waveguide and overlapping with a part of the waveguide, wherein the waveguide has a first region to a third region along a propagation direction of the light from the one of ends, wherein neither the first region nor a part of the second region on a side of the first region in the propagation direction overlaps with the first electrode, wherein the third region and a part of the second region on a side of the third region in the propagation direction overlap with the first electrode, wherein a second width of the second region is larger than a first width of the first region and a third width of the third region.
    Type: Application
    Filed: November 25, 2019
    Publication date: June 18, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hajime TANAKA, Tsutomu ISHIKAWA
  • Patent number: 10606143
    Abstract: A multimode interferometer includes: a multimode waveguide mesa having a top face extending in a direction of a first axis, a first side face and a second side face that extend in the direction of the first axis, and a first end face and a second end face that are arranged in the direction of the first axis; and a waveguide mesa connected to the first end face at a port; first and second waveguide mesas connected to first and second ports on the second end face. The multimode waveguide mesa has a first side edge line shared by the top face and the first side face, and an end line shared by the top face and the first end face. The first side edge line forms an acute angle with the end line at an outer vertex where the first side edge line and the end line meet.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: March 31, 2020
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Hajime Tanaka
  • Publication number: 20200088816
    Abstract: A radio frequency amplifying device according to an embodiment includes amplifying circuitry, obtaining circuitry, and correcting circuitry. The amplifying circuitry is configured to output an amplified signal obtained by amplifying a signal input thereto. The obtaining circuitry is configured to obtain an envelope indicating a waveform of a radio frequency signal as digital data. The correcting circuitry is configured to correct the obtained envelope on the basis of a rising characteristic of the amplifying circuitry and to input the signal generated on the basis of the envelope resulting from the correction to the amplifying circuitry.
    Type: Application
    Filed: September 12, 2019
    Publication date: March 19, 2020
    Applicant: Canon Medical Systems Corporation
    Inventors: Hiroaki Murakoshi, Susumu Kawaguchi, Masaki Tanji, Hirofumi Yamaki, Hajime Tanaka
  • Patent number: 10562015
    Abstract: A honeycomb structure includes: a honeycomb structure body; and a convex part that protrudes outward from a part of circumference of the honeycomb structure body. The convex part surrounds the circumference of the honeycomb structure body like a ring. The convex part is of a tapered shape at least at one end having a tapered face. The convex part has a circumference coating layer making up the tapered face. The convex part has a maximum thickness of 1 to 20 mm, and a rough-face region on the tapered face, the rough-face region having surface roughness of 5 to 70 ?m. The rough-face region has a total of a rough-face region angle of 108° or more. An inclination angle formed between the tapered face and the extending direction of the cells is 10 to 80 degrees.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: February 18, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Hajime Tanaka, Tomokatsu Aoyama
  • Publication number: 20200003853
    Abstract: A radio frequency power supply according to an embodiment is a radio frequency power supply that amplifies an input signal including application timing of a radio frequency magnetic field and waveform information and that supplies the amplified input signal to a radio frequency coil. The radio frequency power supply includes an amplifier and a controlling unit. The amplifier amplifies the input signal and to output an amplified signal. The controlling circuity varies power supply voltage used by the amplifier for the amplification of the input signal, in accordance with the input signal.
    Type: Application
    Filed: July 1, 2019
    Publication date: January 2, 2020
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Hirofumi YAMAKI, Susumu KAWAGUCHI, Mitsuyuki MURAKAMI, Hisanori SUZUKI, Hajime TANAKA
  • Publication number: 20190250225
    Abstract: According to one embodiment, an RF circuit includes a directional coupler, processing circuitry, and an adjuster. The directional coupler includes a first port for outputting at least a part of a traveling wave and a second port for outputting at least a part of a reflected wave. The processing circuitry is configured to calculate impedance of a load side that is viewed from the directional coupler, by using a voltage standing wave ratio based on respective outputs from the first port and the second port and a phase of the reflected wave based on an output from the second port. The adjuster is configured to adjust an output from at least one of the first port and the second port based on the impedance calculated by the processing circuitry.
    Type: Application
    Filed: February 14, 2019
    Publication date: August 15, 2019
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Masaki TANJI, Hajime TANAKA, Hiroaki MURAKOSHI
  • Patent number: 10232299
    Abstract: A honeycomb structure includes a honeycomb substrate having a porous partition wall that defines a plurality of cells that extend from an inlet end face as an inlet side for a fluid to an outlet end face as an outlet side for the fluid, and a porous circumferential wall that is monolithically formed with the partition wall, and a coat layer that is disposed on at least a part of the outer surface of the circumferential wall. Here, a part of the coat layer penetrates into the pores of the circumferential wall, and a thickness of the part of the coat layer that penetrates into the pores of the circumferential wall is from 1 to 90% of the thickness of the circumferential wall.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: March 19, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Yoshitaka Ito, Hajime Tanaka
  • Publication number: 20180373114
    Abstract: A multimode interferometer includes: a multimode waveguide mesa having a top face extending in a direction of a first axis, a first side face and a second side face that extend in the direction of the first axis, and a first end face and a second end face that are arranged in the direction of the first axis; and a waveguide mesa connected to the first end face at a port; first and second waveguide mesas connected to first and second ports on the second end face. The multimode waveguide mesa has a first side edge line shared by the top face and the first side face, and an end line shared by the top face and the first end face. The first side edge line forms an acute angle with the end line at an outer vertex where the first side edge line and the end line meet.
    Type: Application
    Filed: June 25, 2018
    Publication date: December 27, 2018
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Hajime TANAKA
  • Publication number: 20170282164
    Abstract: A honeycomb structure includes: a honeycomb structure body; and a convex part that protrudes outward from a part of circumference of the honeycomb structure body. The convex part surrounds the circumference of the honeycomb structure body like a ring. The convex part is of a tapered shape at least at one end having a tapered face. The convex part has a circumference coating layer making up the tapered face. The convex part has a maximum thickness of 1 to 20 mm, and a rough-face region on the tapered face, the rough-face region having surface roughness of 5 to 70 ?m. The rough-face region has a total of a rough-face region angle of 108° or more. An inclination angle formed between the tapered face and the extending direction of the cells is 10 to 80 degrees.
    Type: Application
    Filed: March 21, 2017
    Publication date: October 5, 2017
    Applicant: NGK INSULATORS, LTD.
    Inventors: Hajime TANAKA, Tomokatsu AOYAMA