Patents by Inventor Mikio Fujiwara

Mikio Fujiwara 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: 11401393
    Abstract: A prepreg includes a resin composition or a semi-cured product of the resin composition, and a glass cloth, wherein the resin composition contains a modified polyphenylene ether compound terminally modified with a substituent having an unsaturated carbon-carbon double bond, and a crosslinkable curing agent having an unsaturated carbon-carbon double bond in a molecule, a content of the modified polyphenylene ether compound is 40 to 90 mass % with respect to a total mass of the modified polyphenylene ether compound and the crosslinkable curing agent, a cured product of the resin composition has a relative permittivity of 2.6 to 3.8, the glass cloth has a relative permittivity of 4.7 or less and a dielectric loss tangent of 0.0033 or less, and a cured product of the prepreg has a relative permittivity of 2.7 to 3.8 and a dielectric loss tangent of 0.002 or less.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: August 2, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yuki Kitai, Mikio Sato, Yasunori Hoshino, Masashi Koda, Takayoshi Ozeki, Hiroaki Fujiwara
  • Publication number: 20220147640
    Abstract: A secret sharing storage system includes at least one user terminal, n units (n: an integer of 2 or more) of storage devices, and a main controller that is communicably connected to a random number generator. The main controller acquires a random number generated by the random number generator in a case of receiving original data sent from the user terminal, executes distributed processing on the original data by using the random number to generate n pieces of distributed data, and stores the n pieces of distributed data respectively in the corresponding n units of storage devices.
    Type: Application
    Filed: January 21, 2020
    Publication date: May 12, 2022
    Applicants: PANASONIC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Masakatsu MATSUO, Katsunori KOGATA, Masahide SASAKI, Mikio FUJIWARA
  • Publication number: 20190245685
    Abstract: A quantum key distribution device is provided with an encoding unit which encodes an optical pulse train; an intensity modulating unit which subjects the encoded optical pulse train to N (where N is an integer at least equal to 3) types of intensity modulation having mutually different intensities, with different timings; and a first key distillation processing unit which generates an encryption key on the basis of a data sequence obtained by removing data obtained from an optical pulse having a specific modulation pattern from a data sequence used by the encoding unit and the intensity modulating unit.
    Type: Application
    Filed: August 31, 2017
    Publication date: August 8, 2019
    Applicants: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATION UNIVERSITY, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Masahide SASAKI, Akihisa TOMITA
  • Patent number: 10193874
    Abstract: Provided is a communication system in which a terminal communicates with a server via a portable communication network used for communication between smartphones. The smart phone includes first pre-shared key and encryption keys, the terminal includes a second pre-shared key, the server includes the encryption keys same as the encryption keys included in the smartphone, authentication between the terminal and the smartphone is performed by using the first pre-shared key and the second pre-shared key, and the terminal and the server perform communication via the smartphone by performing key synchronization of the encryption keys while setting a hash value of the encryption keys as an ID.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: January 29, 2019
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Mikio Fujiwara, Masahide Sasaki
  • Publication number: 20170134351
    Abstract: Provided is a communication system in which a terminal communicates with a server via a portable communication network used for communication between smartphones. The smart phone includes first pre-shared key and encryption keys, the terminal includes a second pre-shared key, the server includes the encryption keys same as the encryption keys included in the smartphone, authentication between the terminal and the smartphone is performed by using the first pre-shared key and the second pre-shared key, and the terminal and the server perform communication via the smartphone by performing key synchronization of the encryption keys while setting a hash value of the encryption keys as an ID.
    Type: Application
    Filed: November 9, 2016
    Publication date: May 11, 2017
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIO NS TECHNOLOGY
    Inventors: Mikio FUJIWARA, Masahide SASAKI
  • Patent number: 8509446
    Abstract: It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: August 13, 2013
    Assignees: National Institute of Information and Communications Technology, NEC Corporation
    Inventors: Mikio Fujiwara, Morio Toyoshima, Masahide Sasaki, Akihisa Tomita, Yoshihiro Nambu, Ken-ichiro Yoshino
  • Patent number: 8374505
    Abstract: A quantum cryptography communication apparatus performs quantum cryptography communication between a transmitter and a receiver. The quantum cryptography communication apparatus includes first communicating unit transmitting and receiving a communication signal including relatively strong pulse light between the transmitter and the receiver, and second communicating unit transmitting and receiving a relatively weak quantum cryptography signal between the transmitter and the receiver in a period in which the communication signal is off and the attitude axis for the receiver can be adjusted to that for the transmitter by the second communicating unit.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: February 12, 2013
    Assignee: National Institute of Information and Communications Technology
    Inventors: Morio Toyoshima, Mikio Fujiwara, Hiroo Kunimori
  • Patent number: 8048731
    Abstract: A method for reducing low frequency noise of a transistor operable at cryogenic temperatures includes a first step in which the transistor is illuminated with a light in a state that the transistor is activated and flowed current by supplying a power at a predetermined temperature, and a second step in which the transistor is operated at the predetermined temperature after the illumination of the light.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: November 1, 2011
    Assignees: National Institute of Information and Communications Technology, National Institutes of Natural Sciences
    Inventors: Mikio Fujiwara, Masahide Sasaki, Hiroshi Matsuo, Hirohisa Nagata
  • Publication number: 20110170695
    Abstract: It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.
    Type: Application
    Filed: December 28, 2010
    Publication date: July 14, 2011
    Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, NEC CORPORATION
    Inventors: Mikio FUJIWARA, Morio TOYOSHIMA, Masahide SASAKI, Akihisa TOMITA, Yoshihiro NAMBU, Ken-ichiro YOSHINO
  • Publication number: 20100237934
    Abstract: A method for reducing low frequency noise of a transistor operable at cryogenic temperatures includes a first step in which the transistor is illuminated with a light in a state that the transistor is activated and flowed current by supplying a power at a predetermined temperature, and a second step in which the transistor is operated at the predetermined temperature after the illumination of the light.
    Type: Application
    Filed: March 18, 2009
    Publication date: September 23, 2010
    Inventors: Mikio Fujiwara, Masahide Sasaki, Hiroshi Matsuo, Hirohisa Nagata
  • Publication number: 20100216516
    Abstract: A terminal (100) is provided with a first case having an operation section (102) including a plurality of operation keys (102a-102c); a second case, which is provided with a display (106) and is turnably arranged to the first case; an angle detector (202) for detecting a turning angle of the second case to the first case; and a controller (207) for changing allocation of functions to each of the operation keys (102a-102c) of the operation section (102), corresponding to the turning angle detected by the angle detector (202).
    Type: Application
    Filed: September 22, 2008
    Publication date: August 26, 2010
    Inventor: Mikio Fujiwara
  • Publication number: 20100208893
    Abstract: A quantum cryptography communication apparatus performs quantum cryptography communication between a transmitter and a receiver. The quantum cryptography communication apparatus includes first communicating unit transmitting and receiving a communication signal including relatively strong pulse light between the transmitter and the receiver, and second communicating unit transmitting and receiving a relatively weak quantum cryptography signal between the transmitter and the receiver in a period in which the communication signal is off and the attitude axis for the receiver can be adjusted to that for the transmitter by the second communicating unit.
    Type: Application
    Filed: September 2, 2008
    Publication date: August 19, 2010
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Morio Toyoshima, Mikio Fujiwara, Hiroo Kunimori
  • Patent number: 7411622
    Abstract: The video signal processor of the present invention comprises a CCD for storing an inputted image by converting it into an electric charge through photoelectrical conversion to be stored by each field and then outputting the stored electric charge by each field; a shutter pulse generator for supplying a shutter pulse which adjusts storage time of the electric charge in the CCD; and a variable controller for variably controlling adjusting amount of electric charge storage time by the shutter pulse by a field unit.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: August 12, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takahiro Mitsui, Mikio Fujiwara, Katsuji Uro
  • Publication number: 20070103598
    Abstract: Again controller gain controls digitalized video signals for each minimum video unit. A variation controller establishes video blocks each consisting of a plurality of minimum video units, and also establishes a gain control value of the gain controller for each of the minimum video units constituting the established video blocks. The gain controller sequentially divides the video signals into the video blocks and gain controls, based on the gain control values, the respective minimum video units constituting each of the divided digital video blocks. In this way, there can be obtained a visual effect equivalent to a conversion of video signals such as 24P video signals to video signals such as 60I video signals by use of a conversion format such as 2:3 pull down method. Moreover, such visual effect can be realized without necessity of any frame memories and without implementing any complex timing controls.
    Type: Application
    Filed: September 16, 2004
    Publication date: May 10, 2007
    Inventors: Katsuji Uro, Mikio Fujiwara
  • Publication number: 20070034781
    Abstract: A low-level light detector includes an avalanche photodiode (APD) to which is applied a bias voltage adjusted to produce a multiplication factor of not more than 30, and a capacitor for accumulating carriers produced by light in the APD and multiplied using the APD characteristics, the capacitor being connected to the avalanche photodiode. The detector detects the intensity of light impinging on the avalanche photodiode by periodically reading the capacitor voltage and obtaining time-based differences in the voltage, or by resetting the capacitor voltage to a predetermined voltage each time the capacitor voltage is read.
    Type: Application
    Filed: October 19, 2006
    Publication date: February 15, 2007
    Applicant: Nat'l Inst of Info & Comm Tech Inc Admin Agency
    Inventors: Makoto Akiba, Mikio Fujiwara
  • Patent number: 7176439
    Abstract: This invention provides a method for manufacturing a circuit for photon number counting without destroying a FET within the circuit by manufacturing a photodetector for weak light, the photodetector for weak light comprising a circuit on a substrate, the circuit comprising light detection means and a field effect transistor (FET), the method comprising: a light detection means connection step; an FET electrode-to-substrate electrode connection step; an external electrode connection step, a light detection means-to-gate connection step.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: February 13, 2007
    Assignee: National Institute of Information and Communication Technology
    Inventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba
  • Patent number: 7135669
    Abstract: A low-level light detector includes an avalanche photodiode (APD) to which is applied a bias voltage adjusted to produce a multiplication factor of not more than 30, and a capacitor for accumulating carriers produced by light in the APD and multiplied using the APD characteristics, the capacitor being connected to the avalanche photodiode. The detector detects the intensity of light impinging on the avalanche photodiode by periodically reading the capacitor voltage and obtaining time-based differences in the voltage, or by resetting the capacitor voltage to a predetermined voltage each time the capacitor voltage is read.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: November 14, 2006
    Assignee: National Institute of Information and Communications Technology Incorporated Administrative Agency
    Inventors: Makoto Akiba, Mikio Fujiwara
  • Patent number: 7115868
    Abstract: The present invention provides a photodetector for weak light that can prevent noise from impurities, prevent electrodes from disconnecting from the substrate, and can be easily cooled; the present invention further provides a photodetector for weak light that can count the number of photons; the present invention solves the above problems by using an ultraviolet light transparent substrate on the photodetector for weak light.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: October 3, 2006
    Assignee: National Institute of Information and Communications Technology Incorporated Administrative Agency
    Inventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba
  • Publication number: 20060163454
    Abstract: A low-level light detector includes an avalanche photodiode (APD) to which is applied a bias voltage adjusted to produce a multiplication factor of not more than 30, and a capacitor for accumulating carriers produced by light in the APD and multiplied using the APD characteristics, the capacitor being connected to the avalanche photodiode. The detector detects the intensity of light impinging on the avalanche photodiode by periodically reading the capacitor voltage and obtaining time-based differences in the voltage, or by resetting the capacitor voltage to a predetermined voltage each time the capacitor voltage is read.
    Type: Application
    Filed: March 28, 2005
    Publication date: July 27, 2006
    Applicant: Nat. Inst. of Info. & Comm. Tech. Inc. Admin. Inst
    Inventors: Makoto Akiba, Mikio Fujiwara
  • Patent number: 7078667
    Abstract: This invention provides a photodetector for weak light and a weak light detection system including the photodetector for weak light the photodetector for weak light is comprised of a substrate on which an integrating read circuit including a PIN photodiode or an APD and an FET is mounted, wherein the entire assembly is mounted while separating the substrate from a ground potential without grounding the substrate, such a photodetector for weak light can reduce noise and ensure a high enough sensitivity enough to be able to discriminate the number of photons.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: July 18, 2006
    Assignee: National Institute of Information and Communications Technology Incorporated Administrative Agency
    Inventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba