Patents by Inventor Kazuyuki Ishida
Kazuyuki Ishida 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: 20130129356Abstract: An optical communication system includes an optical-signal transmission unit transmitting an existing optical signal and a low-rate-signal superimposition unit superimposing a low-rate signal on the existing optical signal by intensity modulation. It further includes: a low-rate-signal extraction unit that extracts the low-rate signal from the existing optical signal on which the low-rate signal is superimposed and converts the extracted low-rate signal into a low-rate electric signal; an add-on optical-signal transmission unit that transmits an add-on optical signal; a low-rate-signal superimposition unit that superimposes a low-rate signal on the add-on optical signal by the intensity modulation based on the low-rate electric signal; and a repeater that repeats the add-on optical signal on which the low-rate signal is superimposed, to a transmission destination.Type: ApplicationFiled: September 3, 2010Publication date: May 23, 2013Applicant: Mitsubishi Electric CorporationInventors: Toshiyuki Tokura, Kazuyuki Ishida, Takashi Mizuochi
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Publication number: 20130039643Abstract: An optical communication system including optical transmission systems each includes a transmission processing unit and a receiving processing unit, wherein the transmission processing unit includes an optical transmission unit that converts electric signals into optical signals, an auxiliary optical transmission unit that converts a part of the electric signals into an optical signal having a wavelength other than wavelengths of the optical signals generated by the optical transmission unit, and outputs the generated optical signal to a different transmission processing unit, and a wavelength multiplexing unit, and the receiving processing unit includes a wavelength demultiplexing unit, an optical receiving unit that converts the optical signals having the wavelengths of the optical signals generated by the optical transmission unit into electric signals, respectively, and an auxiliary optical receiving unit that converts the optical signal having the wavelength of the optical signal generated by the auxiliaType: ApplicationFiled: April 23, 2010Publication date: February 14, 2013Applicant: Mitsubishi Electric CorporationInventors: Toshiyuki Tokura, Katsuhiro Shimizu, Kazuyuki Ishida, Takashi Mizuochi
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Patent number: 8208812Abstract: A control-target-value setting unit sets a control target value corresponding to the number of multiplexed wavelengths measured by a number-of-multiplexed-wavelengths measuring unit. A controller controls the variable optical attenuator based on the control target value. An optical amplifier performs an optical amplification with a constant gain regardless of power of a wavelength-multiplexed light. The controller performs feedback control of the variable optical attenuator such that a result of measurement of the total power of the wavelength-multiplexed light coincides with the control target value.Type: GrantFiled: May 25, 2006Date of Patent: June 26, 2012Assignee: Mitsubishi Electric CorporationInventors: Toshiyuki Tokura, Katsuhiro Shimizu, Kazuyuki Ishida, Kuniaki Motoshima
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Patent number: 8059971Abstract: An optical reception device realizes stabilization of reception sensitivity inexpensively and highly precisely. The optical reception device includes: a Mach-Zehnder type 1-bit delay unit including a one-terminal input port and two-terminal output ports for decoding an optical difference phase shift keying (DPSK) signal and provided with one or more phase control functions to control the phase state of light; photoelectric conversion means for branching a portion of an optical output signal output from the one-side output port of the Mach-Zehnder type 1-bit delay unit, to convert the branched portion into an electric signal; and a phase control unit for controlling the phase state of the Mach-Zehnder type 1-bit delay device by using as an error signal the output signal of the photoelectric conversion means.Type: GrantFiled: December 28, 2004Date of Patent: November 15, 2011Assignee: Mitsubishi Electric CorporationInventors: Shunsuke Mitani, Kazuyuki Ishida, Katsuhiro Shimizu
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Publication number: 20110104511Abstract: By respectively abutting first and second outer diameter sections of a second metallic member against first and second inner diameter sections of a first metallic member, and energizing the first metallic member and the second metallic member using a pair of electrodes while pressurizing both metallic members in an axial direction thereof, a first junction where the first inner diameter section and the first outer diameter section are bonded and a second junction where the second inner diameter section and the second outer diameter section are bonded are formed between both metallic members, and a gap in which the metals do not come into contact with each other is formed between both junctions over a predetermined axial length. Accordingly, a high joint strength can be secured using less energy for bonding.Type: ApplicationFiled: October 28, 2010Publication date: May 5, 2011Applicants: MAZDA MOTOR CORPORATION, ORIGIN ELECTRIC COMPANY, LIMTEDInventors: Shinya OKUMURA, Akira HASHIMOTO, Kazuyuki SHIINO, Takeshi FUJII, Akinobu YAMAGATA, Hiroaki HAYASHI, Tomoo SAWAZAKI, Kazuyuki ISHIDA, Masatoshi HAMANO, Hiroji SASAKI
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Publication number: 20110032422Abstract: In a video processing system which divides HD-size image data into a plurality pieces of sub-image data and performs image processing for upconversion to 4K×2K image data, four image processors synchronous with an HD signal each process a corresponding one of the four pieces of sub-image data. In this case, the image processors process the four pieces of sub-image regions while causing the four pieces of sub-image regions to overlap at their division boundaries, and particularly process the overlapping regions during respective blanking periods. After the image processing of the image processors, the overlapping data is removed. Thereafter, the pieces of image data of the four sub-regions are combined. Therefore, the division boundaries of the pieces of sub-images can be processed without a degradation in image quality.Type: ApplicationFiled: October 18, 2010Publication date: February 10, 2011Applicant: PANASONIC CORPORATIONInventors: Nariaki YAMAMOTO, Shun KINOSHITA, Hiroshi TANIUCHI, Kunihiro KAIDA, Kazuyuki ISHIDA
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Publication number: 20100310835Abstract: Disclosed is a coating composition for a plastic label, which contains an oxetane compound, an epoxy compound, and a cyclic acetal and/or a poly(vinyl butyral). The coating composition excels in suitability for printing such as gravure printing or flexographic printing, cures rapidly to give excellent productivity, and after curing, gives a coating layer that excels in adhesion to a plastic base film and in toughness. A plastic label formed using the coating composition excels in surface scratch resistance and crumpling resistance, and therefore is particularly useful as a label for use in plastic containers, and metal containers such as bottle cans.Type: ApplicationFiled: December 19, 2006Publication date: December 9, 2010Applicant: FUJI SEAL INTERNATIONAL, INC.Inventors: Kazuyuki Ishida, Akira Shintani, Akira Miyazaki, Suguru Arai
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Patent number: 7809281Abstract: A differential encoder generates a differentially encoded signal based on a data signal. An RZ (return to zero) encoder generates an electric RZ differential signal as an RZ signal in an electric area based on the differentially encoded signal. A Mach-Zehnder interferometer type intensity modulator generates an optical RZ-DSPK (differential phase shift keying) signal as an RZ signal in an optical area based on the electric RZ differential signal.Type: GrantFiled: August 27, 2003Date of Patent: October 5, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuyuki Ishida, Kaoru Kinjo, Takashi Mizuochi
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Publication number: 20100239263Abstract: A control-target-value setting unit sets a control target value corresponding to the number of multiplexed wavelengths measured by a number-of-multiplexed-wavelengths measuring unit. A controller controls the variable optical attenuator based on the control target value. An optical amplifier performs an optical amplification with a constant gain regardless of power of a wavelength-multiplexed light. The controller performs feedback control of the variable optical attenuator such that a result of measurement of the total power of the wavelength-multiplexed light coincides with the control target value.Type: ApplicationFiled: May 25, 2006Publication date: September 23, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshiyuki Tokura, Katsuhiro Shimizu, Kazuyuki Ishida, Kuniaki Motoshima
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Publication number: 20080175602Abstract: An optical reception device realizes stabilization of reception sensitivity inexpensively and highly precisely. The optical reception device includes: a Mach-Zehnder type 1-bit delay unit including a one-terminal input port and two-terminal output ports for decoding an optical difference phase shift keying (DPSK) signal and provided with one or more phase control functions to control the phase state of light; photoelectric conversion means for branching a portion of an optical output signal output from the one-side output port of the Mach-Zehnder type 1-bit delay unit, to convert the branched portion into an electric signal; and a phase control unit for controlling the phase state of the Mach-Zehnder type 1-bit delay device by using as an error signal the output signal of the photoelectric conversion means.Type: ApplicationFiled: December 28, 2004Publication date: July 24, 2008Inventors: Shunsuke Mitani, Kazuyuki Ishida, Katsuhiro Shimizu
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Publication number: 20060245763Abstract: A differential encoder generates a differentially encoded signal based on a data signal. An RZ (return to zero) encoder generates an electric RZ differential signal as an RZ signal in an electric area based on the differentially encoded signal. A Mach-Zehnder interferometer type intensity modulator generates an optical RZ-DSPK (differential phase shift keying) signal as an RZ signal in an optical area based on the electric RZ differential signal.Type: ApplicationFiled: August 27, 2003Publication date: November 2, 2006Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Kazuyuki Ishida, Kaoru Kinjo, Takashi Mizuochi
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Patent number: 7092643Abstract: The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.Type: GrantFiled: June 28, 2001Date of Patent: August 15, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Patent number: 7058313Abstract: In the multi-value modulation apparatus, one optical intensity detecting unit detects optical intensity of a modulation optical signal generated by one optical modulation signal generating unit and output from the variable optical attenuator. The detected optical intensity is provided to the comparator. Another optical intensity detecting unit detects optical intensity of a modulation optical signal output from another optical modulation signal generating unit. The attenuator attenuates the optical intensity detected by the another optical intensity detecting unit, and provides it to the comparator. The output of the comparator is provided to the optical variable attenuator as a control signal. The variable optical attenuator controls optical intensity of the modulation optical signal based on the control signal.Type: GrantFiled: October 4, 2001Date of Patent: June 6, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Katsuhiro Shimizu, Kazuyuki Ishida, Yukio Kobayashi
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Patent number: 6836622Abstract: The optical transmitter comprises a light source which inputs continuous optical signal and a driving circuit which inputs driving signal to an optical modulator of Mach-Zehnder type. A photo coupler separates a part of the output of the optical modulator. A photo diode converts this part into electric signal. A band-pass filter and a pre-amplifier extract a frequency component of the driving signal contained in the electric signal. A mixer conducts synchronous detection between the driving signal and the extracted frequency component. Finally, a bias voltage control circuit controls a bias voltage based on a result of the phase comparison.Type: GrantFiled: April 24, 2001Date of Patent: December 28, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tatsuya Kobayashi, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Patent number: 6832048Abstract: An AWG (arrayed-waveguide grating/10A) divides input ports (11A1 to 11An+1−1) into 1 number of groups, each group comprising m number of input ports, and combines optical signals belonging to each of the groups. For example, the optical signals of wavelengths &lgr;1 to &lgr;m are input from the input ports (11A1 to 11Am) and output from an output port (12A1) as multiplex light. The multiplex light output in each of the groups in the above manner is input into a wave combination coupler (18A) and output to a transmission line (19A) as multiplex light of the optical signals of the wavelengths &lgr;1 to &lgr;n.Type: GrantFiled: February 14, 2001Date of Patent: December 14, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuyuki Ishida, Katsuhiro Shimizu
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Publication number: 20020167705Abstract: In the multi-value modulation apparatus, one optical intensity detecting unit detects optical intensity of a modulation optical signal generated by one optical modulation signal generating unit and output from the variable optical attenuator. The detected optical intensity is provided to the comparator. Another optical intensity detecting unit detects optical intensity of a modulation optical signal output from another optical modulation signal generating unit. The attenuator attenuates the optical intensity detected by the another optical intensity detecting unit, and provides it to the comparator. The output of the comparator is provided to the optical variable attenuator as a control signal. The variable optical attenuator controls optical intensity of the modulation optical signal based on the control signal.Type: ApplicationFiled: October 4, 2001Publication date: November 14, 2002Inventors: Katsuhiro Shimizu, Kazuyuki Ishida, Yukio Kobayashi
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Publication number: 20020003648Abstract: The optical transmitter comprises a light source which inputs continuous optical signal and a driving circuit which inputs driving signal to an optical modulator of Mach-Zehnder type. A photo coupler separates a part of the output of the optical modulator. A photo diode converts this part into electric signal. A band-pass filter and a pre-amplifier extract a frequency component of the driving signal contained in the electric signal. A mixer conducts synchronous detection between the driving signal and the extracted frequency component. Finally, a bias voltage control circuit controls a bias voltage based on a result of the phase comparison.Type: ApplicationFiled: April 24, 2001Publication date: January 10, 2002Inventors: Tatsuya Kobayashi, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Publication number: 20020001116Abstract: The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.Type: ApplicationFiled: June 28, 2001Publication date: January 3, 2002Inventors: Satoshi Kajiya, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Publication number: 20020001115Abstract: The optical transmission apparatus has an optical modulator of Mach-Zehnder type, a light source which supplies an optical signal to the optical modulator, a branching filter for taking out a part of an output optical signal, an optical spectrum monitor for monitoring an optical spectrum of an output optical signal taken out, an error signal generator circuit for generating an error signal that shows a bias voltage error based on a result of this monitoring, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.Type: ApplicationFiled: May 17, 2001Publication date: January 3, 2002Inventors: Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Publication number: 20010013966Abstract: An AWG (arrayed-waveguide grating/10A) divides input ports (11A1 to 11An+1−1) into 1 number of groups, each group comprising m number of input ports, and combines optical signals belonging to each of the groups. For example, the optical signals of wavelengths &lgr;1 to &lgr;m are input from the input ports (11A1 to 11Am) and output from an output port (12A1) as multiplex light. The multiplex light output in each of the groups in the above manner is input into a wave combination coupler (18A) and output to a transmission line (19A) as multiplex light of the optical signals of the wavelengths &lgr;1 to &lgr;n.Type: ApplicationFiled: February 14, 2001Publication date: August 16, 2001Inventors: Kazuyuki Ishida, Katsuhiro Shimizu