Patents by Inventor Koki Hirano

Koki Hirano 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: 10643762
    Abstract: An insulated wire includes a conductor, a flame-retardant inner layer that is provided around the conductor and includes a metal hydroxide, and a water ingress prevention layer provided around the flame-retardant inner layer. The insulated wire may further include a flame-retardant outer layer provided around the water ingress prevention layer.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: May 5, 2020
    Assignee: HITACHI METALS, LTD.
    Inventors: Koki Hirano, Masafumi Kaga, Tamotsu Kibe, Seiichi Kashimura, Makoto Iwasaki
  • Publication number: 20190294032
    Abstract: A color conversion element includes: a substrate, a phosphor layer disposed above one principal surface of the substrate, and a joining portion interposed between the substrate and the phosphor layer for joining the substrate and the phosphor layer using metal. The phosphor layer includes individual pieces that are sheet-shaped and planarly arranged. The individual pieces each include at least one type of phosphor. Also, the joining portion has a porous structure obtained by sintering metal nanoparticles.
    Type: Application
    Filed: June 16, 2017
    Publication date: September 26, 2019
    Inventors: Toru HIRANO, Takanori AKETA, Koki OISHI
  • Patent number: 10270676
    Abstract: A signal detecting device provided in a connector at an end of a communication cable or in a communication device to which the connector is connected. The signal detecting device includes a detection circuit that branches and extracts a portion of a signal transmitted through the communication cable and indicates existence of a data communication based on the extracted signal, and a self-diagnostic circuit that inputs a diagnostic signal into the detection circuit upon diagnosis of the detection circuit.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: April 23, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Patent number: 10254197
    Abstract: An optical fiber monitoring system monitors an inter-building optical fiber connecting a first building and a second building. The optical fiber monitoring system includes a first visualization panel provided in the first building and optically connected to an one end of the inter-building optical fiber, a second visualization panel provided in the second building and optically connected to an other end of the inter-building optical fiber, and a monitoring light source provided in the first building to input a monitoring light into the inter-building optical fiber. The first visualization panel includes a first photosensor that partially leaks the monitoring light inputted into the inter-building optical fiber from the monitoring light source and detects an amount of a leaked light. The second visualization panel includes a second photosensor that partially leaks a light from the inter-building optical fiber and detects amount of a leaked light.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: April 9, 2019
    Assignees: HITACHI METALS, LTD., NTT COMMUNICATIONS CORPORATION
    Inventors: Kanako Suzuki, Koki Hirano, Mikio Ohkoshi, Wataru Ohnuki, Yoshihiro Nakatani, Takao Nishikawa, Toshiyuki Suzuki, Toshio Sakai
  • Patent number: 10149378
    Abstract: A communication device is provided wherein a number of the pairs of transmission lines is N, each pair of the transmission lines comprises (N?1) stages of sub-transmission lines generating a same amount of crosstalk as that caused at a connector, and (N?1) stages of connecting portions comprise a transmission path of the connector and a first stage sub-transmission line, and (N?1) stages of the connecting portions to connect an i th stage sub-transmission line and an (i+1) th stage sub-transmission line by the straight/cross connection, and wherein each pair of the transmission lines is different in all pairs in a number of the connecting portion having the cross connection; and as a j th stage connecting portion in any one pair of the transmission lines has cross connection, a (N?j) th stage connecting portion in the any one pair of the transmission lines also has cross connection.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: December 4, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Patent number: 10075211
    Abstract: A crosstalk reduction method includes providing a signal transmission unit including first to eighth main transmission paths, the first and second paths, the third and sixth paths, the fourth and fifth paths and the seventh and eighth paths being respectively paired to transmit differential signals, providing a first coupling transmission path in the signal transmission unit, the first coupling transmission path being adapted to electrically couple the third main transmission path to the fifth and seventh main transmission paths that are located adjacent to the sixth main path, and providing a second coupling transmission path in the signal transmission unit, the second coupling transmission path being adapted to electrically couple the sixth main transmission path to the second and fourth main transmission path that are located adjacent to the third main transmission path.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: September 11, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi
  • Patent number: 9979555
    Abstract: A communication monitoring device includes, a first voltage application circuit 5, mounted on a first connector portion 2b arranged at one end of a communication cable 2 having at least two signal lines 2a, or a first repeater 3 or a first communication device, connecting the first connector portion 2b, wherein the first voltage application circuit 5 applies an alternating current voltage at a predetermined frequency to between any signal lines 2a in the communication cable 2, and a second display portion 6, mounted on a second connector portion 2c arranged at an other end of the communication cable 2, or a second repeater 4 or a second communication device, connecting the second connector portion 2c, wherein the second display portion 6 detects and displays the alternating current voltage at the predetermined frequency applied to between the any signal lines 2a in the communication cable 2.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: May 22, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano
  • Publication number: 20180128709
    Abstract: An optical fiber monitoring system monitors an inter-building optical fiber connecting a first building and a second building. The optical fiber monitoring system includes a first visualization panel provided in the first building and optically connected to an one end of the inter-building optical fiber, a second visualization panel provided in the second building and optically connected to an other end of the inter-building optical fiber, and a monitoring light source provided in the first building to input a monitoring light into the inter-building optical fiber. The first visualization panel includes a first photosensor that partially leaks the monitoring light inputted into the inter-building optical fiber from the monitoring light source and detects an amount of a leaked light. The second visualization panel includes a second photosensor that partially leaks a light from the inter-building optical fiber and detects amount of a leaked light.
    Type: Application
    Filed: November 2, 2017
    Publication date: May 10, 2018
    Inventors: Kanako SUZUKI, Koki HIRANO, Mikio OHKOSHI, Wataru OHNUKI, Yoshihiro NAKATANI, Takao NISHIKAWA, Toshiyuki SUZUKI, Toshio SAKAI
  • Patent number: 9887499
    Abstract: A communication cable connector includes a first connector section to be connected to one end of a communication cable including at least two or more signal lines, a second connector section to be connected to an other end of the communication cable, a first voltage applying circuit mounted to the first connector section to apply a DC voltage between any signal lines of the communication cable, and a first light emitting circuit mounted to the second connector section to emit light when the DC voltage is applied between the any signal lines of the communication cable by the first voltage applying circuit.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: February 6, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Koki Hirano, Yohei Shirakawa
  • Publication number: 20170365373
    Abstract: An insulated wire includes a conductor, a flame-retardant inner layer that is provided around the conductor and includes a metal hydroxide, and a water ingress prevention layer provided around the flame-retardant inner layer. The insulated wire may further include a flame-retardant outer layer provided around the water ingress prevention layer.
    Type: Application
    Filed: June 13, 2017
    Publication date: December 21, 2017
    Inventors: Koki HIRANO, Masafumi KAGA, Tamotsu KIBE, Seiichi KASHIMURA, Makoto IWASAKI
  • Patent number: 9842482
    Abstract: A signal detecting device includes a visualization device including a plural connectors to which a communication cable is connected, a plural detecting circuits that are provided for each of the connectors to be detected, branch and extract a part of a signal transmitted through the communication cable connected to the connectors, and indicate an existence of an data communication based on the extracted signal, and a detecting card that is insertable into and detachable from a card connector arranged in the visualization device and mounts at least a part of the detecting circuit.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: December 12, 2017
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Patent number: 9826631
    Abstract: A repeater includes two connectors each including electrodes and configured to connect a communication cable through which a differential signal is transmitted, a circuit board on which the two connectors are mounted and which includes a signal transmission section configured to connect corresponding electrodes of the two connectors together, and a signal detection circuit mounted on the circuit board and configured to extract a part of a signal transmitted through the signal transmission section and indicate the presence or absence of information communication based on the extracted signal. The circuit board includes a multi-layer substrate including at least an inner layer in which the signal transmission section is formed, two shield layers configured to interpose the signal transmission section therebetween, and an outer layer outside the shield layer on which the signal detection circuit is mounted.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: November 21, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Patent number: 9769039
    Abstract: A communication visualization device includes a transformer for converting a magnetic field caused from a LAN cable connected to an information communication apparatus into electric energy at time of information communication, an amplifier circuit for amplifying the electric energy output from the transformer, a rectifier circuit for converting an amplified signal amplified by the amplifier circuit into a DC voltage, and a light-emitting circuit for emitting light when the DC voltage obtained by conversion of the rectifier circuit is supplied thereto.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: September 19, 2017
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yohei Shirakawa, Koki Hirano, Takumi Kobayashi, Yoshitake Ageishi
  • Patent number: 9746368
    Abstract: A communication light detection adapter includes an adapter main body in which a light extraction hole is formed, a sliding lid attached to the adapter main body so as to slide between a closed position to close the light extraction hole and an open position to open the light extraction hole, and an energizing member to apply a pressure to the sliding lid in a direction from the open position toward the closed position.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: August 29, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Takumi Kobayashi, Koki Hirano, Kanako Suzuki, Mikio Okoshi
  • Patent number: 9729354
    Abstract: A cable signal detector for being provided at a connector at an end of a communication cable transmitting differential signals or at a relay connector to be connected to the connector to detect an existence of information communication. The cable signal detector includes an amplifier circuit that branches and extracts a portion of a signal transmitted through the communication cable, amplifies the extracted signal and outputs the amplified signal, and a display portion that display the existence of information communication based on the output of the amplifier circuit. The amplifier circuit is mounted on a detection device formed separately from the connector or the relay connector. The connector or the relay connector is configured to transmit the extracted signal to the detection device.
    Type: Grant
    Filed: October 31, 2015
    Date of Patent: August 8, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi
  • Patent number: 9712372
    Abstract: A cable signal detector is configured to detect the presence or absence of information communication in a communication cable including a plurality of signal line pairs for differential signaling. The cable signal detector includes a plurality of detecting portions each of which is configured to partially branch and draw a transmission signal from a different signal line pair, rectify the branched and drawn signal into a direct current, and output that direct current, and a displaying portion configured to display the presence or absence of information communication, based on outputs of the plurality of detecting portions. The outputs of the plurality of detecting portions are connected in series, and the displaying portion is configured to display the presence or absence of information communication, based on an overall output voltage of the plurality of detecting portions connected in series.
    Type: Grant
    Filed: October 31, 2015
    Date of Patent: July 18, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi
  • Patent number: 9692683
    Abstract: A communication visualization system includes a wireless power-feeding device for transmitting electromagnetic energy in a wireless manner and a communication visualization device for notifying that a LAN cable connected to an information communication apparatus is performing information communication. The communication visualization device includes an antenna part for receiving the electromagnetic energy transmitted from the wireless power-feeding device, a rectifier circuit for rectifying the electromagnetic energy received by the antenna part to generate a DC voltage, an amplifier circuit for amplifying a communication signal transferred to the communication cable at the time of information communication by using the DC voltage generated by the rectifier circuit as operation power, a rectifier circuit for converting the amplified communication signal into a DC voltage, and a light-emitting circuit for emitting light when the DC voltage after conversion is supplied.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: June 27, 2017
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yohei Shirakawa, Koki Hirano, Takumi Kobayashi, Yoshitake Ageishi
  • Patent number: 9608393
    Abstract: A repeater includes two connectors to each of which a communication cable is connected and a circuit board on which the two connectors are mounted and which includes a signal transmission section configured to connect corresponding ones of electrodes of the two connectors together, and the two connectors are mounted on different surfaces of the circuit board such that the communication cables are inserted in opposite insertion directions.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: March 28, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Yohei Shirakawa, Koki Hirano, Yoshitake Ageishi
  • Publication number: 20170063663
    Abstract: A signal detecting device provided in a connector at an end of a communication cable or in a communication device to which the connector is connected. The signal detecting device includes a detection circuit that branches and extracts a portion of a signal transmitted through the communication cable and indicates existence of a data communication based on the extracted signal, and a self-diagnostic circuit that inputs a diagnostic signal into the detection circuit upon diagnosis of the detection circuit.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 2, 2017
    Inventors: Yohei SHIRAKAWA, Koki Hirano, Yoshitake Ageishi, Yuki Haga
  • Publication number: 20170061769
    Abstract: A signal detecting device includes a visualization device including a plural connectors to which a communication cable is connected, a plural detecting circuits that are provided for each of the connectors to be detected, branch and extract a part of a signal transmitted through the communication cable connected to the connectors, and indicate an existence of an data communication based on the extracted signal, and a detecting card that is insertable into and detachable from a card connector arranged in the visualization device and mounts at least a part of the detecting circuit.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 2, 2017
    Inventors: Yohei SHIRAKAWA, Koki HIRANO, Yoshitake AGEISHI, Yuki HAGA