Patents by Inventor Keiji Sugimoto

Keiji Sugimoto 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: 20230011340
    Abstract: A receiver circuit includes an input terminal for receiving an input current signal, a transimpedance amplifier having an input node, the transimpedance amplifier converting a current signal input to the input node into a voltage signal, an inductor having a first terminal and a second terminal, and a bypass circuit. The first terminal is coupled to the input terminal and the second terminal is coupled to the input node. The bypass circuit includes a bias circuit supplying a bias voltage, a first variable resistor coupled between the first terminal and the bias circuit, a second variable resistor coupled between the second terminal and the bias circuit, and an impedance adjustment circuit including a resistor and a capacitor connected in parallel to the resistor, the impedance adjustment circuit connected in series to at least one of the first variable resistor and the second variable resistor.
    Type: Application
    Filed: June 29, 2022
    Publication date: January 12, 2023
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Seiji KUMAGAI, Yoshiyuki SUGIMOTO, Keiji TANAKA
  • Patent number: 11486760
    Abstract: A receiving circuit includes a first input terminal and a second input terminal, an input circuit that includes a first node, a second node, a first inductor, a second inductor, a first variable resistive element, and a second variable resistive element. The first variable resistive element is electrically connected between the first node and the second input terminal, and the second variable resistive element is electrically connected between the second node and the first input terminal. The receiving circuit further includes a differential amplifier configured to generate a differential voltage signal in accordance with a differential current signal. The receiving circuit still further includes a control circuit configured to perform detection of an amplitude of the differential voltage signal and change a resistance value of the first variable resistive element and a resistance value of the second variable resistive element based on a result of the detection.
    Type: Grant
    Filed: August 18, 2021
    Date of Patent: November 1, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Seiji Kumagai, Yoshiyuki Sugimoto, Keiji Tanaka
  • Patent number: 11394352
    Abstract: A transimpedance amplifier circuit for generating an output voltage in accordance with an input current includes an offset resistor, a common emitter inverting amplifier having a first input and a first output, the first input receiving the input current, an emitter follower having a second input and a second output, the second input being coupled to the first output through the offset resistor, the second output outputting the output voltage, a feedback resistor connected between the second output and the first input, a variable current source connected to a node between the offset resistor and the second input, the variable current source configured to provide an offset current to the offset resistor, the offset current having a current value varied in accordance with a control signal, and a control circuit configured to generate the control signal so that an average voltage of the first output approaches a preset voltage value.
    Type: Grant
    Filed: November 13, 2020
    Date of Patent: July 19, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiyuki Sugimoto, Keiji Tanaka, Seiji Kumagai
  • Patent number: 6733124
    Abstract: Disclosed is a contact lens having a back surface to be placed on a cornea. The back surface includes a generally circular central zone whose radius of curvature gradually decrease from its center toward its periphery, and an peripheral zone disposed around the central zone.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: May 11, 2004
    Assignee: Menicon Co., Ltd.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano
  • Patent number: 6659607
    Abstract: Disclosed is a contact lens including an optical zone having a substantially circular shape; an peripheral zone having an annular shape and located around the optical zone; and an intermediate zone having an annular shape and located between the optical and peripheral zones. The intermediate zone including a convex portion formed in at least one radial position of a back surface thereof so as to extend in a circumferential direction thereof with an outwardly curved surface as seen in a diametrical cross-section of the lens.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: December 9, 2003
    Assignee: Menicon Co., Ltd.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano, Shigeyasu Nagai, Asaki Suzaki, Hideaki Kondo
  • Publication number: 20020163620
    Abstract: Disclosed is a contact lens having a back surface to be placed on a cornea. The back surface includes a generally circular central zone whose radius of curvature gradually decrease from its center toward its periphery, and an peripheral zone disposed around the central zone.
    Type: Application
    Filed: March 20, 2002
    Publication date: November 7, 2002
    Applicant: MENICON CO., LTD.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano
  • Publication number: 20020101563
    Abstract: Disclosed is a contact lens including an optical zone having a substantially circular shape; an peripheral zone having an annular shape and located around the optical zone; and an intermediate zone having an annular shape and located between the optical and peripheral zones. The intermediate zone including a convex portion formed in at least one radial position of a back surface thereof so as to extend in a circumferential direction thereof with an outwardly curved surface as seen in a diametrical cross-section of the lens.
    Type: Application
    Filed: January 24, 2002
    Publication date: August 1, 2002
    Applicant: MENICON CO., LTD.
    Inventors: Kazuya Miyamura, Keiji Sugimoto, Tadashi Sawano, Shigeyasu Nagai, Asaki Suzaki, Hideaki Kondo
  • Patent number: 5502086
    Abstract: A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of (A) from 1 to 30% by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolymerizing (a) an alkyl (meth)acrylate and (b) a monomer having at least two polymerizable groups per molecule, as the main components; (B) from 45 to 95% by weight of a fatty acid vinyl ester; (C) from 0.02 to 10% by weight of a crosslinking agent which is not decomposable by saponification; and (D) from 0.1 to 20% by weight of a crosslinking agent which is decomposable by saponification.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: March 26, 1996
    Assignee: Menicon Co., Ltd.
    Inventors: Haruyuki Hiratani, Keiji Sugimoto
  • Patent number: 5426133
    Abstract: 1. A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of:(A) from 1 to 30% by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolymerizing (a) an alkyl (meth)acrylate and (b) a monomer having at least two polymerizable groups per molecule, as the main components;(B) from 1 to 10% by weight of a vinyl monomer selected from the group consisting of maleic acid esters and N-vinyl lactams;(C) from 50 to 98% by weight of a fatty acid vinyl ester; and(D) from 0.02 to 10% by weight of a cross linking monomer.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: June 20, 1995
    Assignee: Menicon Co., Ltd.
    Inventors: Yasuhito Hishida, Masanori Kadoya, Keiji Sugimoto, Tsuyoshi Watanabe, Noriko Iwata
  • Patent number: 4856656
    Abstract: The first invention provides a multi-layer film comprising (A) a low density polyethylene-based resin layer, (B) a polyolefin-based resin expanded layer and (C) a high density polyethylene-based resin layer.The second invention provides a package comprising (I) an article to be packaged, (II) the multi-layer film of the first invention, said multi-layer film being used in packaging the article in such a manner that the low density polyethylene-based resin layer is in contact with the article, and (III) a buffering material being used to fix the article.The multi-layer film of the first invention is excellent in buffering properties, tensile strength, tear strength, impact strength and stiffness, and further has good frictional charcteristics and good pearl-like appearance.With the package of the second invention, an article can be efficiently protected during its storage and transportation, and thus an easily scratchable article can be effectively protected.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: August 15, 1989
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventors: Keiji Sugimoto, Takeo Hayashi, Masahiro Fujimoto
  • Patent number: 4723471
    Abstract: In construction of a keyboard device well suited for use on an electronic piano and a piano training device, a combination of a jack element corresponding to a jack on an actual action assembly, an abutment whose force acting on the jack element corresponds to the weight of an actual hammer, and a releaser corresponding to actual regulating button provides key touch very close to that obtained on an actual piano equipped with action assemblies.
    Type: Grant
    Filed: May 28, 1986
    Date of Patent: February 9, 1988
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventor: Keiji Sugimoto