Patents by Inventor Yuji Takahashi

Yuji Takahashi 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: 8929375
    Abstract: When stored identifying information of a transmission target frame and identifying information of a received frame are equal, a node apparatus updates transmission feasibility information stored in association with the final destination of the received frame. The transmission feasibility information indicates feasibility of transmission to each of a plurality of adjacent node apparatuses being a transmission destination, and is updated so that feasibility of transmission to the transmission destination associated with the identifying information of the received frame indicates that “the transmission is infeasible”. The node apparatus transmits the received frame, when there is no adjacent apparatus to which transmission is feasible, and when the stored identifying information of the transmission target frame is equal to the identifying information of the received frame, to the adjacent node apparatus recognized as the origin in association with the identifying information of the received frame.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: January 6, 2015
    Assignee: Fujitsu Limited
    Inventors: Tadashige Iwao, Yuji Takahashi, Syunsuke Koga, Yuri Noguchi
  • Publication number: 20150007103
    Abstract: A terminal device that includes a display controller that, when a normal slide operation is detected in a state in which a display section is displaying a scrollable screen, performs scroll display of the scrollable screen according to the normal slide operation; that, when a special slide operation has been detected, the special slide operation instructing a scroll amount to reach a non-displayed state screen for display by the display section, out of non-displayed state screens other than a displayed state screen of the scrollable screen that is being displayed by the display section, displays, amount identification information identifying the scroll amount instructed by the special slide operation; and that, when a screen switching condition is satisfied following on continuously from an instruction state of the special slide operation, displays, a non-displayed state screen identified by the scroll amount instructed by the special slide operation.
    Type: Application
    Filed: June 19, 2014
    Publication date: January 1, 2015
    Inventor: Yuji TAKAHASHI
  • Patent number: 8917021
    Abstract: A power supply apparatus of an embodiment includes a first filter, a second filter, and a switching power supply. The first filter and the second filter attenuate a common mode current to a level lower than a normal mode current. The switching power supply is connected between the first filter and the second filter, and supplies electric power to an illumination load via the second filter.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: December 23, 2014
    Assignee: Toshiba Lighting & Technology
    Inventors: Yuji Takahashi, Hirokazu Otake, Noriyuki Kitamura, Hiroshi Akahoshi
  • Patent number: 8891716
    Abstract: A node device includes a processor, a wireless RF circuit, a memory, and a timer. The processor measures a clock time. The wireless RF circuit receives a clock time information frame containing clock time information used for correcting the clock time. The memory stores a transmission processing time period, as a fixed value, from when a transmission source node device of the clock time information frame obtains the clock time information until when the transmission source node device transmits the clock time information frame. The timer measures a reception processing time period, which is a period of time from when the clock time information frame is received until when the clock time information is obtained. The node device sets to the processor a value obtained by adding the fixed value and the reception processing time period to the clock time information.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: November 18, 2014
    Assignee: Fujitsu Limited
    Inventors: Yuji Takahashi, Kouki Shigaki, Katsumi Sugawa, Tadashige Iwao
  • Patent number: 8884536
    Abstract: A lighting power source according to an embodiment includes a rectification circuit, a smoothing capacitor, a waveform shaping circuit, and a DC-DC converter. The rectification circuit rectifies an AC voltage input thereto. The waveform shaping circuit is connected between the rectification circuit and the smoothing capacitor, performs a switching operation to repeat an ON state and an OFF state when the voltage output from the rectification circuit is relatively high, continues to be in the ON state to allow the current to flow to the rectification circuit when the voltage output from the rectification circuit is relatively low. The DC-DC converter converts a voltage charged in the smoothing capacitor.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: November 11, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Noriyuki Kitamura, Hirokazu Otake, Yuji Takahashi
  • Patent number: 8879557
    Abstract: When stored identifying information of a transmission target frame and identifying information of a received frame are equal, a node apparatus updates transmission feasibility information stored in association with the final destination of the received frame. The transmission feasibility information indicates feasibility of transmission to each of a plurality of adjacent node apparatuses being a transmission destination, and is updated so that feasibility of transmission to the transmission destination associated with the identifying information of the received frame indicates that “the transmission is infeasible”. The node apparatus transmits the received frame, when there is no adjacent apparatus to which transmission is feasible, and when the stored identifying information of the transmission target frame is equal to the identifying information of the received frame, to the adjacent node apparatus recognized as the origin in association with the identifying information of the received frame.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: November 4, 2014
    Assignee: Fujitsu Limited
    Inventors: Tadashige Iwao, Yuji Takahashi, Syunsuke Koga, Yuri Noguchi
  • Publication number: 20140313783
    Abstract: An integrated switching power supply device includes a series-connected body, a driving control element, and external terminals. In the series-connected body, a switching element, a constant current element, and a diode are connected in series. The driving control element controls to drive the constant current element. The external terminals include first to seventh external terminals. The first and second external terminals are connected to main terminals of elements of the series-connected body. The third external terminal is connected to a connection point of main terminals of the switching element or the constant current element and a main terminal of the diode. The fourth external terminal is connected to a control terminal of the switching element. The fifth external terminal supplies electric power to the driving control element. The sixth external terminal inputs reference potential. The seventh external terminal inputs a signal to the driving control element.
    Type: Application
    Filed: May 20, 2014
    Publication date: October 23, 2014
    Applicant: TOSHIBA LIGHTING AND TECHNOLOGY CORPORATION
    Inventors: Yuji TAKAHASHI, Noriyuki KITAMURA
  • Publication number: 20140309373
    Abstract: A phase difference film obtained by stretching a resin film formed of a resin composition containing a copolymer having a first structural unit represented by the following formula (1) and a second structural unit represented by the following formula (2), in at least a uniaxial direction, in which the content of the first structural unit in the above-described copolymer is 3 to 50 mol % on the basis of the total of the first structural unit and the second structural unit.
    Type: Application
    Filed: November 6, 2012
    Publication date: October 16, 2014
    Applicant: JX NIPPON OIL & ENERGY CORPORATION
    Inventors: Akira Matsuo, Yuji Takahashi, Akira Takagi, Hisashi Sone
  • Publication number: 20140301513
    Abstract: A node device includes a processor, a wireless RF circuit, a memory, and a timer. The processor measures a clock time. The wireless RF circuit receives a clock time information frame containing clock time information used for correcting the clock time. The memory stores a transmission processing time period, as a fixed value, from when a transmission source node device of the clock time information frame obtains the clock time information until when the transmission source node device transmits the clock time information frame. The timer measures a reception processing time period, which is a period of time from when the clock time information frame is received until when the clock time information is obtained. The node device sets to the processor a value obtained by adding the fixed value and the reception processing time period to the clock time information.
    Type: Application
    Filed: June 20, 2014
    Publication date: October 9, 2014
    Inventors: Yuji TAKAHASHI, Kouki SHIGAKI, Katsumi SUGAWA, Tadashige IWAO
  • Publication number: 20140285099
    Abstract: According to one embodiment, there is provided a power supply circuit including a power conversion unit, a current regulator, a controller, and a controller power supply. The power conversion unit converts an AC voltage with a controlled conduction angle into a different voltage. The current regulator includes a branch path electrically connected to the power supply path and switches between a first state in which a part of a current flowing through the power supply path flows to the branch path and a second state in which a current flowing to the branch path is lower than that of the first state. The controller switches the current regulator to the second state in at least a part of a conduction period of a detected conduction angle and switches the current regulator to the first state in a blocking period of the detected conduction angle.
    Type: Application
    Filed: September 4, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Hiroshi Akahoshi, Hirokazu Otake, Noriyuki Kitamura, Yuji Takahashi
  • Publication number: 20140285100
    Abstract: According to one embodiment, provided is a power supply circuit including a power conversion unit, a controller, and an integrated circuit. The power conversion unit converts an AC voltage into a different voltage. The integrated circuit includes a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to an input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state, a controller power supply that converts a voltage into a driving voltage and supplies the driving voltage to the controller, a connection terminal for connecting an auxiliary power supply used for generating the driving voltage, and a protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal.
    Type: Application
    Filed: September 4, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Hiroshi Akahoshi, Noriyuki Kitamura, Yuji Takahashi, Hirokazu Otake, Go Kato, Hiroto Nakamura
  • Publication number: 20140285089
    Abstract: According to one embodiment, a power supply circuit includes: a DC-DC converter which converts a first DC voltage supplied from a power supply flow path into a second DC voltage having a different absolute value, to supply the voltage to a DC load; and an overcurrent protection unit which is electrically connected to an end portion of the DC load on a low potential side, and performs feedback control of the DC-DC converter based on current which flows to the DC load. The DC-DC converter includes a normally-on type switching element. The overcurrent protection unit is electrically connected to the third electrode. When the current which flows to the DC load is greater than a reference value, the overcurrent protection unit changes the state of the switching element from the first state to the second state by decreasing the potential of the third electrode.
    Type: Application
    Filed: September 3, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Hiroshi Akahoshi, Noriyuki Kitamura, Hirokazu Otake, Yuji Takahashi
  • Publication number: 20140285176
    Abstract: According to one embodiment, there is provided a power-supply circuit including a substrate, a chopper circuit, a conductive member, first capacitative elements, and second capacitative elements. The substrate includes a mounting surface. The chopper circuit is provided on the mounting surface, includes input ends, output ends, and a switching element, and converts a voltage input from the input ends and outputs the voltage from the output ends according to switching driving of the switching element. The conductive member is adjacent to at least a part of the chopper circuit. The first capacitative elements are electrically connected between the input ends and the conductive member and capacitively couple the input ends and the conductive member. The second capacitative elements are electrically connected between the output ends and the conductive member and capacitively couple the output ends and the conductive member.
    Type: Application
    Filed: September 4, 2013
    Publication date: September 25, 2014
    Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
    Inventors: Yuji Takahashi, Noriyuki Kitamura, Hirokazu Otake, Hiroshi Akahoshi
  • Publication number: 20140285101
    Abstract: According to one embodiment, a lighting light source including a current control element and a voltage-dividing resistor is provided. The current control element has a first main electrode, a second main electrode series-connected with respect to a lighting light source, and a first control electrode for controlling a current flowing between the first main electrode and the second main electrode, and controls a current supplied to the lighting light source. The voltage-dividing resistor is parallel-connected with respect to the lighting light source and connected to the first control electrode, and inputs a voltage obtained by division of a voltage of the lighting light source to the first control electrode.
    Type: Application
    Filed: September 5, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventors: Noriyuki Kitamura, Hiroshi Akahoshi, Hirokazu Otake, Yuji Takahashi
  • Patent number: 8836234
    Abstract: According to one embodiment, a power supply for lighting includes a rectifying circuit, a smoothing capacitor, and a current control circuit. The rectifying circuit rectifies a phase-controlled alternating-current voltage supplied to between a pair of input terminals. The smoothing capacitor is connected to a high-potential terminal and a low-potential terminal of the rectifying circuit. A first electric current flows to the current control circuit in a period when an absolute value of the alternating-current voltage is lower than a specified value. After a second electric current larger than the first electric current flows when the absolute value of the alternating-current voltage increases to be equal to or larger than the specified value, the current control circuit is shut off to reduce a current value to be smaller than the second electric current until the absolute value of the alternating-current voltage decreases to be lower than the specified value.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: September 16, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Noriyuki Kitamura, Hirokazu Otake, Yuji Takahashi
  • Publication number: 20140247821
    Abstract: Each of the nodes counts the number of other nodes located in a communication area of the node among nodes in a multi-hop network, and determines the number of times to retransmit a frame based on the counted number of the other nodes. Each of the nodes transmits a frame to a destination node, and repeats retransmission of the frame the determined number of times until receiving a response to the transmitted frame. Subsequently, each of the nodes changes a route to the destination node to another route when it does not receive the response after repeating the retransmissions the determined number of times.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 4, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Kenji Yamada, Yuji TAKAHASHI, Syunsuke KOGA
  • Patent number: 8817616
    Abstract: In a node device 1 in a communication network, an FID management table 5 stores an FID for unique identification of a frame and the information about a destination node of the frame, and a weighting table 7 stores weighting information about another node as a destination for relay of the frame for each final destination node of the frame. When a frame transmitted to a local node is received, and if the FID of the received frame is stored in the FID management table 5, the data about the destination node associated with the FID is updated. If the FID of the frame received from the frame reception device is not stored in the FID management table 5, the FID management table 5 corresponding to the destination node of the frame is referred to, and another node as a destination for relay of the frame is determined.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: August 26, 2014
    Assignee: Fujitsu Limited
    Inventors: Tadashige Iwao, Kentaro Masubuchi, Chiaki Nakajima, Kentaro Ikemoto, Syunsuke Koga, Yuji Takahashi
  • Patent number: 8803433
    Abstract: A lighting power source according to an embodiment includes a rectifying circuit, a smoothing capacitor, a reference voltage generating circuit, and a DC-DC converter. The rectifying circuit rectifies an AD voltage input thereto. The smoothing capacitor smoothes an output from the rectifying circuit. The reference voltage generating circuit generates a reference voltage on the basis of at least any one of an output voltage of the rectifying circuit and a voltage from the smoothing capacitor. The DC-DC converter includes an output element and a constant current element, and converts the voltage of the smoothing capacitor. The output element receives a supply of a voltage of the smoothing capacitor, oscillates by performing a switching operation which repeats an ON state and an OFF state when the reference voltage is relatively high, and continues the ON state when the reference voltage is relatively low.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: August 12, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Noriyuki Kitamura, Yuji Takahashi, Hirokazu Otake
  • Patent number: 8797015
    Abstract: According to one embodiment of the invention, there is provided a switching power supply device including a rectifying circuit and a switching operation conversion circuit. The rectifying circuit receives a phase-controlled alternating voltage to rectify to a direct voltage. The switching operation conversion circuit starts up by being applied with the direct voltage, and includes a normally on type switching element and an off driving circuit. The normally on type switching element passes an input current, and the off driving circuit turns off the switching element when the input current reaches a prescribed value. The switching operation conversion circuit converts the direct voltage to an output voltage different from the direct voltage by repeating a switching operation of turning on and off the switching element.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: August 5, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Noriyuki Kitamura, Yuji Takahashi, Koji Takahashi, Toru Ishitaka, Koji Suzuki
  • Patent number: 8796938
    Abstract: A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: August 5, 2014
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Yuji Takahashi, Noriyuki Kitamura, Koji Suzuki, Koji Takahashi, Toru Ishikita