Patents by Inventor Yoshiaki Tamura

Yoshiaki Tamura 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: 20220256050
    Abstract: An image forming apparatus includes a printing section, an electrostatic touch panel, a power source circuit section, and a contact member. The printing section performs printing. The electrostatic touch panel receives a touch operation by a user. The power source circuit section receives supply of power from a commercial power source and supplies power to the printing section and the electrostatic touch panel. The contact member is connected to a ground of an image forming apparatus and is touched by a user operating the electrostatic touch panel.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 11, 2022
    Inventor: Yoshiaki TAMURA
  • Publication number: 20220206214
    Abstract: An optical fiber has a structure uniform in a longitudinal direction. This optical fiber includes a core and a cladding that surrounds the core in a cross-section perpendicular to the longitudinal direction. A refractive index of the cladding is lower than a refractive index of the core. The cladding has, in the cross-section, an inner cladding layer including an inner circumferential surface of the cladding, and an outer cladding layer including an outer circumferential surface of the cladding. The inner cladding layer contains fluorine. The inner and outer cladding layers have refractive indexes different from each other. The outer cladding layer includes a local maximum portion where a residual stress, which is a tensile stress, becomes local maximum. A radial distance between the local maximum portion and an inner circumferential surface of the outer cladding layer is 10 ?m or less.
    Type: Application
    Filed: April 6, 2020
    Publication date: June 30, 2022
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki TAMURA, Yuki KAWAGUCHI, Hirotaka SAKUMA, Masato SUZUKI
  • Patent number: 11345627
    Abstract: The present invention relates to a method of manufacturing an optical fiber preform for obtaining an optical fiber with low transmission loss. A core preform included in the optical fiber preform comprises three or more core portions, which are each produced by a rod-in-collapse method, and in which both their alkali metal element concentration and chlorine concentration are independently controlled. In two or more manufacturing steps of the manufacturing steps for each of the three or more core portions, an alkali metal element is added. As a result, the mean alkali metal element concentration in the whole core preform is controlled to 7 atomic ppm or more and 70 atomic ppm or less.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: May 31, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuya Haruna, Masaaki Hirano, Yoshiaki Tamura, Yuki Kawaguchi
  • Patent number: 11316316
    Abstract: The present embodiment relates to an optical amplifier and the like having a structure for enabling efficient use of pumping light while avoiding complication of a device structure. In such an optical amplifier, since pumping light from a pumping light source is supplied to each core of an amplification MCF, a coupling MCF in which adjacent cores form a coupled core is arranged between the amplification MCF and the pumping light source. The pumping light source is optically connected to a specific core of the coupling MCF, and pumping light is coupled from the specific core to remaining cores except the specific core in the coupling MCF before pumping light is supplied to each core of the amplification MCF. This enables coupling of pumping light between optically connected cores between the amplification MCF and the coupling MCF.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: April 26, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takemi Hasegawa, Tetsuya Hayashi, Yoshiaki Tamura, Hirotaka Sakuma, Shigehiro Nagano
  • Patent number: 11280958
    Abstract: An optical fiber having an effective area that can be easily increased and bending loss characteristics that can be easily improved is provided. The optical fiber includes a glass fiber including a core and a cladding; a first resin coating layer that is in contact with the glass fiber and surrounds the glass fiber; and a second resin coating layer that surrounds the first resin coating layer and has a Young's modulus greater than a Young's modulus of the first resin coating layer. An effective area is greater than or equal to 110 ?m2 and less than or equal to 180 ?m2 at a wavelength of 1550 nm. A cable cut-off wavelength is less than or equal to 1530 nm. A uniformity of thickness of the first resin coating layer is greater than or equal to 60% and less than or equal to 80%.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: March 22, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuki Kawaguchi, Yoshiaki Tamura, Hirotaka Sakuma
  • Publication number: 20220045461
    Abstract: An internal unit of an electronic apparatus includes a receptacle to be inserted and removed successfully in any of two specific directions, and a controller circuit electrically connected to the receptacle. A cable includes a connector corresponding to the receptacle. When connecting the connector to the receptacle in one direction of the two specific directions without detecting the connection direction of the connector to the receptacle, the controller circuit successfully performs transmission of at least one of the signal and the power between the plurality of internal units. When connecting the connector to the receptacle in another direction of the two specific directions, the controller circuit does not successfully perform the transmission. The connector includes a connection direction restrictor that allows connection to the receptacle in the one direction and prohibits connection to the receptacle in the other direction.
    Type: Application
    Filed: July 28, 2021
    Publication date: February 10, 2022
    Inventors: Minoru SHINBA, Yoshiaki TAMURA
  • Patent number: 11181684
    Abstract: An optical fiber is formed from silica glass, and includes a core, a first cladding which surrounds the core and has a refractive index lower than the refractive index of the core, and a second cladding which surrounds the first cladding and has a refractive index that is lower than the refractive index of the core and higher than the refractive index of the first cladding. The second cladding is divided into an inner region that is in contact with the first cladding and an outer region which surrounds the inner region and has a thickness that is half the thickness of the second cladding or less, while being 5 ?m or more. The residual stress in at least a part of the outer region is a compressive stress.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: November 23, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki Tamura, Hirotaka Sakuma, Keisei Morita
  • Patent number: 11169322
    Abstract: An optical fiber having an effective area that can be easily increased and bending loss characteristics that can be easily improved is provided. The optical fiber includes a glass fiber including a core and a cladding; a first resin coating layer that is in contact with the glass fiber and surrounds the glass fiber; and a second resin coating layer that surrounds the first resin coating layer and has a Young's modulus greater than a Young's modulus of the first resin coating layer. An effective area is greater than or equal to 110 ?m2 and less than or equal to 180 ?m2 at a wavelength of 1550 nm. A cable cut-off wavelength is less than or equal to 1530 nm. A uniformity of thickness of the first resin coating layer is greater than or equal to 60% and less than or equal to 80%.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: November 9, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuki Kawaguchi, Yoshiaki Tamura, Hirotaka Sakuma
  • Publication number: 20210294028
    Abstract: One embodiment of the present disclosure relates to an optical fiber having lower transmission loss. The optical fiber is an optical fiber comprised of silica-based glass and includes a core including a central axis and a cladding. The cladding surrounds the core and has a refractive index lower than a refractive index of the core. The core contains phosphorus, chlorine, and fluorine. The core further includes an alkali metal element or an alkaline earth metal element. In a cross section of the optical fiber orthogonal to the central axis, a ratio Rp/Ra of a radius Rp of a phosphorus-containing region with respect to a radius Ra of the core is 0.3 or more.
    Type: Application
    Filed: June 4, 2021
    Publication date: September 23, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hirotaka SAKUMA, Yoshiaki TAMURA, Yuki KAWAGUCHI, Masato SUZUKI
  • Patent number: 11067937
    Abstract: An image forming apparatus includes a power switch, a power supply circuit, a power supply control unit, and a main control unit that sends a control signal to the power supply control unit and allows the power supply control unit to perform the power supply process based on the control signal. The power supply control unit starts to count pressing time as an elapsed time while the power switch is kept pressed. If the pressing time reaches a predetermined time without a change in the control signal, the power supply control unit forcibly starts a power shutdown process. If the control signal changes before the pressing time reaches the predetermined time, the power supply control unit starts the power shutdown process after receiving from the main control unit the control signal requesting for the power shutdown process.
    Type: Grant
    Filed: August 17, 2020
    Date of Patent: July 20, 2021
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Yoshiaki Tamura
  • Patent number: 11048040
    Abstract: The optical fiber offered is capable of not only restraining the attenuation due to glass defects, but also reducing the increase of manufacturing cost. The optical fiber is made of silica glass and includes a core and a cladding. The cladding encloses the core and has a refractive index smaller than that of the core. When the core is divided into inner core and outer core at half of the radius of the core, the average chlorine concentration of the inner core is larger than that of the outer core. The core includes any of the alkali metal group.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: June 29, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hirotaka Sakuma, Yoshiaki Tamura, Keisei Morita, Yuki Kawaguchi
  • Publication number: 20210171390
    Abstract: An optical fiber includes a core, and a cladding. When a refractive index of silica glass is set as no, a refractive index of the core is set as n1, and a refractive index of the cladding is set as n2, a relative refractive index difference ? defined by Expression (1): ?[%]=100×(n12?n22)/2n02??(1) is 0.2% or higher. A ratio of a maximum value of a concentration of the dopant composed of the alkali metal element or the alkaline-earth metal element in the cladding to a maximum value of a concentration of the dopant composed of the alkali metal element or the alkaline-earth metal element in the core is 0.06 or higher and 0.25 or lower.
    Type: Application
    Filed: January 25, 2021
    Publication date: June 10, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki TAMURA, Hirotaka SAKUMA, Akiko FUNAKOSHI
  • Publication number: 20210157053
    Abstract: An optical fiber line of one embodiment comprises an HNLF, an SMF, and an MFD transition portion. The MFD transition portion includes end portions of both the HNLF and the SMF facing with a fusion point thereof, and is a section in which an MFD changes such that a difference between a maximum value and a minimum value is 0.3 ?m or more for a 100 ?m-length. A splicing loss of the HNLF and the SMF at 1,550 nm is one-fifth or less than an ideal butting loss at stationary portions thereof. A total length of the MFD transition portion is 10 mm or less. In a region between one end surface of the HNLF at the fusion point and the other end surface separated from the one end surface by 50 ?m or more and 300 ?m or less, the MFD increases monotonically from the other end surface to the one end surface.
    Type: Application
    Filed: February 5, 2021
    Publication date: May 27, 2021
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masato SUZUKI, Yoshinori YAMAMOTO, Yoshiaki TAMURA, Takemi HASEGAWA
  • Patent number: 10989864
    Abstract: The optical fiber has an effective area that is greater than or equal to 110 ?m2 and less than or equal to 180 ?m2 at a wavelength of 1550 nm and a cable cut-off wavelength of less than or equal to 1530 nm. An average value of a glass outer diameter in a longitudinal direction is 125±0.5 ?m. When ? is a standard deviation of the glass outer diameter in the longitudinal direction, 3? is greater than or equal to 0.1 ?m and less than or equal to 0.5 ?m.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: April 27, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuki Kawaguchi, Yoshiaki Tamura, Hirotaka Sakuma
  • Publication number: 20210055684
    Abstract: An image forming apparatus includes a power switch, a power supply circuit, a power supply control unit, and a main control unit that sends a control signal to the power supply control unit and allows the power supply control unit to perform the power supply process based on the control signal. The power supply control unit starts to count pressing time as an elapsed time while the power switch is kept pressed. If the pressing time reaches a predetermined time without a change in the control signal, the power supply control unit forcibly starts a power shutdown process. If the control signal changes before the pressing time reaches the predetermined time, the power supply control unit starts the power shutdown process after receiving from the main control unit the control signal requesting for the power shutdown process.
    Type: Application
    Filed: August 17, 2020
    Publication date: February 25, 2021
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Yoshiaki TAMURA
  • Publication number: 20200400879
    Abstract: An optical fiber according to an embodiment of the present disclosure includes a core and a cladding which surrounds the core. The cladding includes an inner cladding layer which surrounds the core and an outer cladding layer which surrounds the inner cladding layer. A maximum value ?n1max of a relative refractive index difference of the core, a minimum value ?n2min of a relative refractive index difference of the inner cladding layer, and a maximum value ?n3max of a relative refractive index difference of the outer cladding layer satisfy a relationship of ?n2min<?n3max<?n1max. A residual stress ?(r) at a radial position r satisfies |d?(r)/dr|?30 MPa/?m in the cladding.
    Type: Application
    Filed: June 11, 2020
    Publication date: December 24, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuki KAWAGUCHI, Yoshiaki TAMURA, Hirotaka SAKUMA, Masato SUZUKI
  • Publication number: 20200393613
    Abstract: An optical fiber is formed from silica glass, and includes a core, a first cladding which surrounds the core and has a refractive index lower than the refractive index of the core, and a second cladding which surrounds the first cladding and has a refractive index that is lower than the refractive index of the core and higher than the refractive index of the first cladding. The second cladding is divided into an inner region that is in contact with the first cladding and an outer region which surrounds the inner region and has a thickness that is half the thickness of the second cladding or less, while being 5 ?m or more. The residual stress in at least a part of the outer region is a compressive stress.
    Type: Application
    Filed: August 27, 2020
    Publication date: December 17, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki TAMURA, Hirotaka SAKUMA, Keisei MORITA
  • Publication number: 20200333528
    Abstract: The optical fiber has an effective area that is greater than or equal to 110 ?m2 and less than or equal to 180 ?m2 at a wavelength of 1550 nm and a cable cut-off wavelength of less than or equal to 1530 nm. An average value of a glass outer diameter in a longitudinal direction is 125±0.5 ?m. When ? is a standard deviation of the glass outer diameter in the longitudinal direction, 3? is greater than or equal to 0.1 ?m and less than or equal to 0.5 ?m.
    Type: Application
    Filed: July 2, 2020
    Publication date: October 22, 2020
    Inventors: Yuki KAWAGUCHI, Yoshiaki TAMURA, Hirotaka SAKUMA
  • Publication number: 20200292750
    Abstract: An optical fiber according to an embodiment has a structure for enabling determination of improvement in transmission loss at a preform stage. The optical fiber includes: a core containing Cl and having an average refractive index lower than a refractive index of pure silica glass; a first cladding containing F; a second cladding; and a resin coating, in which an effective area at a wavelength of 1550 nm is 135 ?m2 or more and 170 ?m2 or less, a ratio of the effective area to a cutoff wavelength ?C is 85.0 ?m or more, a bending loss of an LP01 mode at a wavelength of 1550 nm and at a bending radius of R15 mm is less than 4.9 dB per 10 turns, and the resin coating includes a primary resin layer having a Young's modulus of 0.3 MPa or less.
    Type: Application
    Filed: March 11, 2020
    Publication date: September 17, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masato SUZUKI, Yuki KAWAGUCHI, Hirotaka SAKUMA, Yoshiaki TAMURA, Takemi HASEGAWA
  • Patent number: 10775555
    Abstract: The present embodiment relates to an optical fiber line or the like configured by connecting a single-mode optical fiber with a cladding containing fluorine and a large Aeff optical fiber by TEC connection, and a connection state between such two types of optical fibers is set such that a connection loss expressed in dB of a fundamental mode is equal to or less than 55% of an ideal butt loss expressed in dB at a wavelength of 1550 nm.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: September 15, 2020
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masato Suzuki, Yoshiaki Tamura, Yoshinori Yamamoto, Takemi Hasegawa, Suguru Takasaki, Saori Kubara