Patents by Inventor Toshimasa Umezawa
Toshimasa Umezawa 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).
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Publication number: 20210364642Abstract: [Problem] To provide a camera with high sensitivity even if an output to the outside is weak. [Solution] This camera includes a light source 3, a demultiplexing unit 5 which demultiplexes light from the light source 3 into first demultiplexed light and second demultiplexed light, a first modulator 7 which modulates the first demultiplexed light to obtain a modulated signal, an emission unit 9 which emits the modulation signal modulated by the first modulator 7, and a phase imparting means 11 which imparts a plurality of types of phase shifts to the second demultiplexed light to obtain phase-imparted local light.Type: ApplicationFiled: June 3, 2019Publication date: November 25, 2021Applicant: National Institute of Information and Communications TechnologyInventors: Keizo INAGAKI, Toshimasa UMEZAWA, Naokatsu YAMAMOTO, Tetsuya KAWANISHI
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Patent number: 10911153Abstract: To provide a photodetector which enables reception of massively parallel optical communication, and with which a large volume of data for multi-mode transmission or multi-core transmission can be received instantaneously at once. A photodetector comprising a two-dimensional photodetector array in which a plurality of photodetectors 9 are arranged in a two-dimensional array, and which includes a wire 12 having a width of not more than 4 ?m between the plurality of photodetectors. Each of the photodetectors has a light reception area with a side measuring not more than 100 ?m. The plurality of photodetectors arranged in a two-dimensional array are spaced apart from each other by not less than 20 ?m.Type: GrantFiled: March 7, 2018Date of Patent: February 2, 2021Assignee: National Institute of Information and Communications TechnologyInventors: Toshimasa Umezawa, Takahide Sakamoto, Atsushi Kanno, Naokatsu Yamamoto, Tetsuya Kawanishi
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Publication number: 20200044745Abstract: To provide a photodetector which enables reception of massively parallel optical communication, and with which a large volume of data for multi-mode transmission or multi-core transmission can be received instantaneously at once. A photodetector comprising a two-dimensional photodetector array in which a plurality of photodetectors 9 are arranged in a two-dimensional array, and which includes a wire 12 having a width of not more than 4 ?m between the plurality of photodetectors. Each of the photodetectors has a light reception area with a side measuring not more than 100 ?m. The plurality of photodetectors arranged in a two-dimensional array are spaced apart from each other by not less than 20 ?m.Type: ApplicationFiled: March 7, 2018Publication date: February 6, 2020Inventors: Toshimasa UMEZAWA, Takahide SAKAMOTO, Atsushi KANNO, Naokatsu YAMAMOTO, Tetsuya KAWANISHI
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Publication number: 20190020319Abstract: There is provided a photoelectric converter that converts an optical signal into an electrical signal for amplification, the photoelectric converter including a photoelectric conversion element that converts the optical signal into an electrical signal and outputs the electrical signal from an output terminal, a high-frequency amplifier that includes an input terminal of an electrical signal output from the output terminal and a DC cut-off capacitor which is disposed at an output stage of the input terminal and is serially connected to the input terminal and that amplifies the electrical signal, and an inductance element that is disposed between a bias power supply applying bias voltage or bias current to the photoelectric conversion element and the input terminal and which is connected in parallel to the DC cut-off capacitor.Type: ApplicationFiled: January 10, 2017Publication date: January 17, 2019Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Toshimasa UMEZAWA, Kouichi AKAHANE, Atsushi MATSUMOTO, Atsushi KANNO, Naokatsu YAMAMOTO, Tetsuya KAWANISHI
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Patent number: 7442912Abstract: An optical logic device performs a logic operation on a plurality of input light signals. The optical logic device has a photoelectric conversion portion, in which photoreceivers for receiving input light signals are provided in parallel, that outputs an electric signal obtained by adding up outputs of the photoreceivers, and a comparator that compares a voltage level of the electric signal outputted from the photoelectric conversion portion with a predetermined voltage level.Type: GrantFiled: March 2, 2005Date of Patent: October 28, 2008Assignee: Yokogawa Electric CorporationInventors: Morio Wada, Akira Miura, Tsuyoshi Yakihara, Masayuki Suehiro, Daisuke Hayashi, Shinji Iio, Toshimasa Umezawa, Takahiro Kudo, Takashi Mogi, Shoujirou Araki, Machio Dobashi, Katsuya Ikezawa
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Optical packet communication device with an applied negative voltage for canceling an offset voltage
Patent number: 7435938Abstract: There is provided a PD-TIA module that can be used for recognition of an address of an optical packet signal in a system having variation in mark rate all the time, such as an optical packet communication system. An optical communication module comprises a photoelectric converter for converting an optical signal into a current signal, a current/voltage conversion means connected to the photoelectric converter, for converting the current signal into a voltage signal, and a limiting amplifier for receiving and amplifying an electric signal subjected to voltage conversion by the current/voltage conversion means while comparing the electric signal as amplified with a predetermined threshold value, thereby outputting a signal for “0” or “1”.Type: GrantFiled: October 30, 2006Date of Patent: October 14, 2008Assignee: Yokogawa Electric CorporationInventors: Daisuke Hayashi, Masayuki Suehiro, Hirotoshi Kodaka, Yasukazu Akasaka, Shinji Iio, Morio Wada, Toshimasa Umezawa, Toshiyasu Izawa, Hiroshi Shimizu -
Publication number: 20070164198Abstract: There is provided a PD-TIA module that can be used for recognition of an address of an optical packet signal in a system having variation in mark rate all the time, such as an optical packet communication system. An optical communication module comprises a photoelectric converter for converting an optical signal into a current signal, a current/voltage conversion means connected to the photoelectric converter, for converting the current signal into a voltage signal, and a limiting amplifier for receiving and amplifying an electric signal subjected to voltage conversion by the current/voltage conversion means while comparing the electric signal as amplified with a predetermined threshold value, thereby outputting a signal for “0” or “1”.Type: ApplicationFiled: October 30, 2006Publication date: July 19, 2007Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Daisuke Hayashi, Masayuki Suehiro, Hirotoshi Kodaka, Yasukazu Akasaka, Shinji Iio, Morio Wada, Toshimasa Umezawa, Toshiyasu Izawa, Hiroshi Shimizu
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Publication number: 20060268566Abstract: A light receiving module for receiving a plurality of light rays that includes a first optical element having a plurality of light emitting sections, a second optical element having a plurality of light receiving sections, and a gradient index lens which condenses a plurality of light rays being output from the plurality of light emitting sections to the plurality of light receiving sections respectively, the gradient index lens being disposed between the first optical element and the second optical element.Type: ApplicationFiled: May 9, 2006Publication date: November 30, 2006Inventors: Morio Wada, Toshimasa Umezawa, Takahiro Kudo, Takashi Mogi, Kenji Kusumoto
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Publication number: 20050194519Abstract: An optical logic device performs a logic operation on a plurality of input light signals. The optical logic device has a photoelectric conversion portion, in which photoreceivers for receiving input light signals are provided in parallel, that outputs an electric signal obtained by adding up outputs of the photoreceivers, and a comparator that compares a voltage level of the electric signal outputted from the photoelectric conversion portion with a predetermined voltage level.Type: ApplicationFiled: March 2, 2005Publication date: September 8, 2005Inventors: Morio Wada, Akira Miura, Tsuyoshi Yakihara, Masayuki Suehiro, Daisuke Hayashi, Shinji Iio, Toshimasa Umezawa, Takahiro Kudo, Takashi Mogi, Shoujirou Araki, Machio Dobashi, Katsuya Ikezawa
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Publication number: 20040213584Abstract: An optical signal processing apparatus capable of performing high-speed operation is to be realized. According to this invention, at least one photodiode for converting an optical signal to an electrical signal, and a resonant tunneling diode for having the electrical signal of this photodiode inputted thereto and performing switch operation are provided to acquire a digital signal.Type: ApplicationFiled: March 31, 2004Publication date: October 28, 2004Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Shun-ichi Miyazaki, Akira Miura, Sadaharu Oka, Chie Sato, Tsuyoshi Yakihara, Shinji Kobayashi, Morio Wada, Hirotoshi Kodaka, Toshimasa Umezawa