Patents by Inventor Akihiro Otaka

Akihiro Otaka 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: 20200241054
    Abstract: An image generating device is an apparatus for acquiring an image which shows a direction of an electric current flowing through a semiconductor device. The image generating device comprises a signal application unit configured to apply a stimulation signal to the semiconductor device, a magnetic detection unit configured to output a detection signal based on a magnetism generated by an application of the stimulation signal, and an image generation unit configured to generate phase image data comprising a phase component which indicates a phase difference based on the phase difference between the detection signal and a reference signal which is generated based on the stimulation signal and generate an electric current direction image which shows the direction of the electric current based on the phase image data.
    Type: Application
    Filed: April 7, 2020
    Publication date: July 30, 2020
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Akihiro OTAKA, Tomonori NAKAMURA
  • Patent number: 10698006
    Abstract: An inspection apparatus includes a tester unit that applies a stimulus signal to a semiconductor apparatus, an MO crystal arranged to face a semiconductor apparatus, a light source that outputs light, an optical scanner that irradiates the MO crystal with light output from light source, a light detector that detects light reflected from the MO crystal arranged to face the semiconductor apparatus D and outputs a detection signal, and a computer that generate phase image data based on a phase difference between a reference signal generated based on a stimulus signal and the detection signal, the phase image data including a phase component indicating the phase difference, and generates an image indicating a path of a current from the phase image data.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: June 30, 2020
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Tomonori Nakamura, Akihiro Otaka
  • Patent number: 10656187
    Abstract: An image generating device is an apparatus for acquiring an image which shows a direction of an electric current flowing through a semiconductor device. The image generating device comprises a signal application unit configured to apply a stimulation signal to the semiconductor device, a magnetic detection unit configured to output a detection signal based on a magnetism generated by an application of the stimulation signal, and an image generation unit configured to generate phase image data comprising a phase component which indicates a phase difference based on the phase difference between the detection signal and a reference signal which is generated based on the stimulation signal and generate an electric current direction image which shows the direction of the electric current based on the phase image data.
    Type: Grant
    Filed: September 5, 2016
    Date of Patent: May 19, 2020
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Akihiro Otaka, Tomonori Nakamura
  • Publication number: 20190212252
    Abstract: A semiconductor device inspection method of inspecting a semiconductor device which is an inspection object includes: a step of inputting a stimulation signal to the semiconductor device; a step of acquiring a detection signal based on a reaction of the semiconductor device to which the stimulation signal has been input; a step of generating a first in-phase image and a first quadrature image including amplitude information and phase information in the detection signal based on the detection signal and a reference signal generated based on the stimulation signal; and a step of performing, a filtering process of reducing noise on at least one of the first in-phase image and the first quadrature image and then generating a first amplitude image based on the first in-phase image and the first quadrature image.
    Type: Application
    Filed: July 4, 2017
    Publication date: July 11, 2019
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Tomonori NAKAMURA, Akihiro OTAKA
  • Publication number: 20190064228
    Abstract: An image generating device is an apparatus for acquiring an image which shows a direction of an electric current flowing through a semiconductor device. The image generating device comprises a signal application unit configured to apply a stimulation signal to the semiconductor device, a magnetic detection unit configured to output a detection signal based on a magnetism generated by an application of the stimulation signal, and an image generation unit configured to generate phase image data comprising a phase component which indicates a phase difference based on the phase difference between the detection signal and a reference signal which is generated based on the stimulation signal and generate an electric current direction image which shows the direction of the electric current based on the phase image data.
    Type: Application
    Filed: September 5, 2016
    Publication date: February 28, 2019
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Akihiro OTAKA, Tomonori NAKAMURA
  • Publication number: 20180031614
    Abstract: An inspection apparatus includes a tester unit that applies a stimulus signal to a semiconductor apparatus, an MO crystal arranged to face a semiconductor apparatus, a light source that outputs light, an optical scanner that irradiates the MO crystal with light output from light source, a light detector that detects light reflected from the MO crystal arranged to face the semiconductor apparatus D and outputs a detection signal, and a computer that generate phase image data based on a phase difference between a reference signal generated based on a stimulus signal and the detection signal, the phase image data including a phase component indicating the phase difference, and generates an image indicating a path of a current from the phase image data.
    Type: Application
    Filed: February 2, 2016
    Publication date: February 1, 2018
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Tomonori NAKAMURA, Akihiro OTAKA
  • Patent number: 9680595
    Abstract: An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: June 13, 2017
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryogo Kubo, Jun-ichi Kani, Akihiro Otaka
  • Patent number: 9618550
    Abstract: A semiconductor device testing apparatus 1A includes a tester unit 16 that generates an operational pulse signal, an optical sensor 10 that outputs a detection signal as a response to the operational pulse signal, a pulse generator 17 that generates a reference signal containing a plurality of harmonics for the operational pulse signal in synchronization with the operational pulse signal, a spectrum analyzer 13 that receives the detection signal and acquires a phase and amplitude of the detection signal at a detection frequency, a spectrum analyzer 14 that receives the reference signal and acquires a phase of the reference signal at a detection frequency, and an analysis control unit 18 that acquires a time waveform of the detection signal based on the phase and the amplitude of the detection signal acquired by the spectrum analyzer 13 and the phase of the reference signal acquired by the spectrum analyzer 14.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: April 11, 2017
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Tomonori Nakamura, Akihiro Otaka, Mitsunori Nishizawa
  • Patent number: 9618576
    Abstract: A semiconductor device measurement apparatus 1A includes a tester 2 that generates an operational pulse signal to be input to a semiconductor device 3, a light source 5 that generates light, a light branch optical system 6 that irradiates the semiconductor device with the light, a light detector 7 that detects reflected light obtained by the semiconductor device 3 reflecting the light, and outputs a detection signal, an analog signal amplifier 8 that amplifies the detection signal and outputs an amplified signal, and an analysis apparatus 10 that analyzes an operation of the semiconductor device 3 based on the amplified signal and a predetermined correction value, wherein the predetermined correction value is obtained based on a signal obtained by the analog signal amplifier 8 amplifying a signal corresponding to a harmonic of a fundamental frequency of the operational pulse signal.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: April 11, 2017
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Akihiro Otaka, Mitsunori Nishizawa, Nobuyuki Hirai, Tomonori Nakamura
  • Patent number: 9596046
    Abstract: An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 14, 2017
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryogo Kubo, Jun-ichi Kani, Akihiro Otaka
  • Publication number: 20150153408
    Abstract: A semiconductor device measurement apparatus 1A includes a tester 2 that generates an operational pulse signal to be input to a semiconductor device 3, a light source 5 that generates light, a light branch optical system 6 that irradiates the semiconductor device with the light, a light detector 7 that detects reflected light obtained by the semiconductor device 3 reflecting the light, and outputs a detection signal, an analog signal amplifier 8 that amplifies the detection signal and outputs an amplified signal, and an analysis apparatus 10 that analyzes an operation of the semiconductor device 3 based on the amplified signal and a predetermined correction value, wherein the predetermined correction value is obtained based on a signal obtained by the analog signal amplifier 8 amplifying a signal corresponding to a harmonic of a fundamental frequency of the operational pulse signal.
    Type: Application
    Filed: November 25, 2014
    Publication date: June 4, 2015
    Inventors: Akihiro OTAKA, Mitsunori NISHIZAWA, Nobuyuki HIRAI, Tomonori NAKAMURA
  • Publication number: 20150130474
    Abstract: A semiconductor device testing apparatus 1A includes a tester unit 16 that generates an operational pulse signal, an optical sensor 10 that outputs a detection signal as a response to the operational pulse signal, a pulse generator 17 that generates a reference signal containing a plurality of harmonics for the operational pulse signal in synchronization with the operational pulse signal, a spectrum analyzer 13 that receives the detection signal and acquires a phase and amplitude of the detection signal at a detection frequency, a spectrum analyzer 14 that receives the reference signal and acquires a phase of the reference signal at a detection frequency, and an analysis control unit 18 that acquires a time waveform of the detection signal based on the phase and the amplitude of the detection signal acquired by the spectrum analyzer 13 and the phase of the reference signal. acquired by the spectrum analyzer 14.
    Type: Application
    Filed: November 7, 2014
    Publication date: May 14, 2015
    Inventors: Tomonori NAKAMURA, Akihiro OTAKA, Mitsunori NISHIZAWA
  • Patent number: 8929737
    Abstract: An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: January 6, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Ryogo Kubo, Jun-ichi Kani, Akihiro Otaka
  • Publication number: 20130259468
    Abstract: An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
    Type: Application
    Filed: March 12, 2013
    Publication date: October 3, 2013
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Ryogo Kubo, Jun-ichi Kani, Akihiro Otaka
  • Publication number: 20110318008
    Abstract: An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
    Type: Application
    Filed: February 19, 2010
    Publication date: December 29, 2011
    Inventors: Ryogo Kubo, Jun-ichi Kani, Akihiro Otaka
  • Patent number: 6470017
    Abstract: A packet multiplexing apparatus is presented for multiplexing packets to be transmitted from a number of user facilities to a local service node in such a way to assure equal access to the output port for all the users. The apparatus is provided with input ports for inputting a packet in a respective input port; a buffer memory provided for each input port for temporary storage of a packet; an output signal transmission circuit for retrieving a packet from each buffer memory in a specific sequence; an output port for transmitting packets output from the output signal transmission circuit; and a retrieval sequencing section for controlling the specific sequence by changing a retrieving order of packets from buffer memories for each complete round of packet retrieval so that a frequency of the retrieving order for each input port is uniformly shared by the input ports.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: October 22, 2002
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Akihiro Otaka, Noriki Miki, Norio Tamaki