Patents by Inventor Kei Katou
Kei Katou 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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Patent number: 11500264Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and an object that is disposed on the substrate. The optical waveguide includes a mode conversion/branching portion that converts a mode of a light wave propagating through the optical waveguide and branches the light wave, and the object is disposed to cover a part or the whole of the mode conversion/branching portion or not to cover the mode conversion/branching portion when the substrate is viewed in a plan view. In a case where the object is disposed to cover a part of the mode conversion/branching portion, the object is disposed not to consecutively cover a section over a length of a predetermined value or higher in an advancing direction of a light wave.Type: GrantFiled: August 11, 2021Date of Patent: November 15, 2022Assignee: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Kei Katou, Norikazu Miyazaki
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Patent number: 11204507Abstract: A positioning member for positioning optical components includes a laminated body in which a plurality of thin metal plates is laminated. In the positioning member for positioning the optical components by an upper surface of a first plate forming the laminated body and a side surface of a second plate disposed above the first plate, a portion where two non-parallel side surfaces of the second plate for positioning the optical components cross each other includes a cutout portion including a crossing portion of the side surfaces.Type: GrantFiled: March 26, 2019Date of Patent: December 21, 2021Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Tokutaka Hara, Kei Katou
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Publication number: 20210373408Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and an object that is disposed on the substrate. The optical waveguide includes a mode conversion/branching portion that converts a mode of a light wave propagating through the optical waveguide and branches the light wave, and the object is disposed to cover a part or the whole of the mode conversion/branching portion or not to cover the mode conversion/branching portion when the substrate is viewed in a plan view. In a case where the object is disposed to cover a part of the mode conversion/branching portion, the object is disposed not to consecutively cover a section over a length of a predetermined value or higher in an advancing direction of a light wave.Type: ApplicationFiled: August 11, 2021Publication date: December 2, 2021Applicant: Sumitomo Osaka Cement Co., Ltd.Inventors: Kei KATOU, Norikazu MIYAZAKI
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Patent number: 11109480Abstract: A transmission line has a signal electrode formed on one surface of a flexible printed circuit, and a ground electrode formed on the other surface of the flexible printed circuit. A connection terminal has signal terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through a via hole, and ground terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through the via hole. The signal terminal on the surface, on which the ground electrode is formed, is formed such that at least a width in an end portion on the transmission line side is narrower than a width of a part of the signal terminal on the surface, on which the signal electrode is formed, to be at the same position when the flexible printed circuit is seen in a plan view.Type: GrantFiled: January 30, 2019Date of Patent: August 31, 2021Assignee: Sumitomo Osaka Cement Co., LtdInventors: Norikazu Miyazaki, Kei Katou, Toshio Kataoka
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Patent number: 11022763Abstract: An optical module in which an optical element is housed in a housing includes: an optical window member through which input light to the optical element or output light from the optical element passes and which hermetically seals inside of the housing; and a holding member that holds the optical window member. The optical window member is fixed to the housing by the holding member. A difference between linear expansion coefficients of the holding member and the optical window member is smaller than a difference between linear expansion coefficients of the housing and the optical window member. A position where the optical window member is attached on the holding member protrudes to an optical element side from a position where the holding member itself is fixed.Type: GrantFiled: March 26, 2019Date of Patent: June 1, 2021Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Tokutaka Hara, Kei Katou
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Patent number: 10671717Abstract: A communication device includes: a first subscriber identification unit that stores first subscriber identification unit identification information associated with user identification information; and a communication unit that communicates with another communication device, the other communication device including a second subscriber identification unit that stores second subscriber identification unit identification information associated with user identification information.Type: GrantFiled: October 19, 2016Date of Patent: June 2, 2020Assignee: KDDI CORPORATIONInventors: Keisuke Takemori, Takamasa Isohara, Yoshiyuki Shibata, Kei Katou, Teruaki Honma
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Patent number: 10558064Abstract: An optical communication module includes: an optical modulator that includes an optical modulation element housed in a rectangular parallelepiped container; a driver circuit that inputs a high-frequency signal to the optical modulation element; and a housing that houses the optical modulator and the driver circuit. An electrical interface is provided on one lateral surface of the housing, and an optical interface is provided on another lateral surface, which is opposite to the lateral surface, of the housing. In the optical modulator, an end of a wiring substrate, which is configured to introduce the high-frequency signal to the optical modulation element, is led out from one short-side side of the rectangular parallelepiped container, and the driver circuit is disposed between the short-side side of the optical modulator and the electrical interface.Type: GrantFiled: March 30, 2018Date of Patent: February 11, 2020Inventors: Norikazu Miyazaki, Kei Katou
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Publication number: 20200033692Abstract: An optical waveguide device includes a substrate on which an optical waveguide is formed, and an object that is disposed on the substrate. The optical waveguide includes a mode conversion/branching portion that converts a mode of a light wave propagating through the optical waveguide and branches the light wave, and the object is disposed to cover a part or the whole of the mode conversion/branching portion or not to cover the mode conversion/branching portion when the substrate is viewed in a plan view. In a case where the object is disposed to cover a part of the mode conversion/branching portion, the object is disposed not to consecutively cover a section over a length of a predetermined value or higher in an advancing direction of a light wave.Type: ApplicationFiled: July 23, 2019Publication date: January 30, 2020Inventors: Kei KATOU, Norikazu MIYAZAKI
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Patent number: 10527874Abstract: An optical modulator is provided and includes a substrate that has an electro-optic effect, an optical waveguide that is formed on the substrate, a plurality of control electrodes that control a light wave propagated through the optical waveguide, and a plurality of light receiving elements that detect a light wave propagated through the optical waveguide. The optical modulator has two or more independent optical waveguide modulation portions. The light receiving elements are respectively provided in an upper part of the substrate with respect to the independent optical waveguide modulation portions. A wiring substrate is located above the substrate. A plurality of electric wirings are located on the wiring substrate. The plurality of electric wirings are disposed to extend in the vicinity of one side of the wiring substrate, are electrically connected to the light receiving elements, and output a signal detected by the light receiving elements to the outside.Type: GrantFiled: April 3, 2017Date of Patent: January 7, 2020Assignee: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Norikazu Miyazaki, Kei Katou
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Patent number: 10502982Abstract: An optical modulator including an optical modulation element mounted inside a housing, in which at least a portion of an electric line is connected to an external circuit board through a flexible printed circuit, and which is disposed on the external circuit board. A recess portion that mounts the flexible printed circuit is formed on an outer bottom surface of the housing and at a part where the flexible printed circuit is connected, and a device for preventing a resonance mode is provided such that a resonance mode of a microwave and a millimeter wave or a parallel plate mode is prevented from being generated among a surface A of the recess portion facing the flexible printed circuit, an electric wiring part B provided on the flexible printed circuit overlapping the surface A when seen in a plan view, an electric wiring part C provided on the external circuit board overlapping the surface A when seen in a plan view.Type: GrantFiled: April 29, 2019Date of Patent: December 10, 2019Assignee: Sumitomo Osaka Cement Co., Ltd.Inventors: Kei Katou, Toshio Kataoka, Junichiro Ichikawa
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Publication number: 20190302378Abstract: An optical module in which an optical element is housed in a housing includes: an optical window member through which input light to the optical element or output light from the optical element passes and which hermetically seals inside of the housing; and a holding member that holds the optical window member. The optical window member is fixed to the housing by the holding member. A difference between linear expansion coefficients of the holding member and the optical window member is smaller than a difference between linear expansion coefficients of the housing and the optical window member. A position where the optical window member is attached on the holding member protrudes to an optical element side from a position where the holding member itself is fixed.Type: ApplicationFiled: March 26, 2019Publication date: October 3, 2019Inventors: Tokutaka HARA, Kei KATOU
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Publication number: 20190302471Abstract: A positioning member for positioning optical components includes a laminated body in which a plurality of thin metal plates is laminated. In the positioning member for positioning the optical components by an upper surface of a first plate forming the laminated body and a side surface of a second plate disposed above the first plate, a portion where two non-parallel side surfaces of the second plate for positioning the optical components cross each other includes a cutout portion including a crossing portion of the side surfaces.Type: ApplicationFiled: March 26, 2019Publication date: October 3, 2019Inventors: Tokutaka HARA, Kei KATOU
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Publication number: 20190258089Abstract: An optical modulator including an optical modulation element mounted inside a housing, in which at least a portion of an electric line is connected to an external circuit board through a flexible printed circuit, and which is disposed on the external circuit board. A recess portion that mounts the flexible printed circuit is formed on an outer bottom surface of the housing and at a part where the flexible printed circuit is connected, and a device for preventing a resonance mode is provided such that a resonance mode of a microwave and a millimeter wave or a parallel plate mode is prevented from being generated among a surface A of the recess portion facing the flexible printed circuit, an electric wiring part B provided on the flexible printed circuit overlapping the surface A when seen in a plan view, an electric wiring part C provided on the external circuit board overlapping the surface A when seen in a plan view.Type: ApplicationFiled: April 29, 2019Publication date: August 22, 2019Inventors: Kei KATOU, Toshio KATAOKA, Junichiro ICHIKAWA
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Publication number: 20190239352Abstract: A transmission line has a signal electrode formed on one surface of a flexible printed circuit, and a ground electrode formed on the other surface of the flexible printed circuit. A connection terminal has signal terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through a via hole, and ground terminals formed on both the surfaces of the flexible printed circuit and electrically connected to each other through the via hole. The signal terminal on the surface, on which the ground electrode is formed, is formed such that at least a width in an end portion on the transmission line side is narrower than a width of a part of the signal terminal on the surface, on which the signal electrode is formed, to be at the same position when the flexible printed circuit is seen in a plan view.Type: ApplicationFiled: January 30, 2019Publication date: August 1, 2019Inventors: Norikazu MIYAZAKI, Kei KATOU, Toshio KATAOKA
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Patent number: 10365506Abstract: Provided is an optical modulator in which a phenomenon of a resonance mode or the like is prevented from being generated in a recess portion of a housing that mounts a flexible printed circuit and of which broadband characteristics are improved. There is provided an optical modulator in which an optical modulation element is mounted inside a housing, in which at least a portion of an electric line is connected to an external circuit board 7 through a flexible printed circuit 6, and which is disposed on the external circuit board.Type: GrantFiled: September 27, 2016Date of Patent: July 30, 2019Assignee: SUMITOMO OSAKA CEMENT CO., LTDInventors: Kei Katou, Toshio Kataoka, Junichiro Ichikawa
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Patent number: 10348007Abstract: There is provided an optical control element module including: an optical control element having an optical waveguide and a control electrode on a substrate and disposed in a housing; an electrical connection part which is electrically connected to the control electrode, extends along a direction intersecting a plane on which the control electrode of the substrate is disposed, and is disposed in the housing; and a wiring substrate which has an input signal line electrically connected to the electrical connection part, at least a part of which is disposed outside the housing, in which impedance of the electrical connection part is set to be smaller than impedance of the input signal line.Type: GrantFiled: February 27, 2018Date of Patent: July 9, 2019Assignee: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Toshio Kataoka, Kei Katou
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Patent number: 10268057Abstract: An optical modulator includes: an optical modulation element which is accommodated in a housing and has a signal electrode; a lead pin for inputting a high-frequency signal; a relay substrate in which a conductor pattern which electrically connects the lead pin and the signal electrode is formed; and a conductive extension portion which extends along a length direction of the lead pin in a range which includes at least a position of a connection portion between the lead pin and the conductor pattern, in which the extension portion is electrically connected to the housing.Type: GrantFiled: December 22, 2017Date of Patent: April 23, 2019Assignee: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Kei Katou, Toru Sugamata
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Publication number: 20190113778Abstract: An optical modulator is provided and includes a substrate that has an electro-optic effect, an optical waveguide that is formed on the substrate, a plurality of control electrodes that control a light wave propagated through the optical waveguide, and a plurality of light receiving elements that detect a light wave propagated through the optical waveguide. The optical modulator has two or more independent optical waveguide modulation portions. The light receiving elements are respectively provided in an upper part of the substrate with respect to the independent optical waveguide modulation portions. A wiring substrate is located above the substrate. A plurality of electric wirings are located on the wiring substrate. The plurality of electric wirings are disposed to extend in the vicinity of one side of the wiring substrate, are electrically connected to the light receiving elements, and output a signal detected by the light receiving elements to the outside.Type: ApplicationFiled: April 3, 2017Publication date: April 18, 2019Applicant: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Norikazu MIYAZAKI, Kei KATOU
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Publication number: 20190025612Abstract: Provided is an optical modulator in which a phenomenon of a resonance mode or the like is prevented from being generated in a recess portion of a housing that mounts a flexible printed circuit and of which broadband characteristics are improved. There is provided an optical modulator in which an optical modulation element is mounted inside a housing, in which at least a portion of an electric line is connected to an external circuit board 7 through a flexible printed circuit 6, and which is disposed on the external circuit board.Type: ApplicationFiled: September 27, 2016Publication date: January 24, 2019Inventors: Kei KATOU, Toshio KATAOKA, Junichiro ICHIKAWA
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Patent number: 10162201Abstract: Provided is an optical modulator in which low-voltage drive and a stable modulation characteristic are secured over a wide bandwidth.Type: GrantFiled: December 24, 2015Date of Patent: December 25, 2018Assignee: SUMITOMO OSAKA CEMENT CO., LTD.Inventors: Norikazu Miyazaki, Toshio Kataoka, Youichi Hosokawa, Kei Katou