Patents by Inventor Mikio Yoneyama
Mikio Yoneyama 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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Patent number: 10260585Abstract: A brake disc of the present invention is a brake disc that stops the rotation of an axle when a brake pad is pressed on a surface of the brake disc, including a disc main body that is attached to a rotary body integrally rotating with the axle; and a plurality of build-up layers laminated on a surface of the disc main body, in which the build-up layers are laminated on the surface of the disc main body by means of laser metal deposition welding.Type: GrantFiled: September 12, 2014Date of Patent: April 16, 2019Assignees: RAILWAY TECHNICAL RESEARCH INSTITUTE, NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shin-ichi Saga, Yasushi Karino, Kazutaka Asabe, Atsushi Sakaguchi, Mikio Yoneyama, Yoshihiro Tatsumi
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Patent number: 10243664Abstract: An optical modulator driver circuit (1) includes an amplifier (50, Q10, Q11, R10-R13), and a current amount adjustment circuit (51) capable of adjusting a current amount of the amplifier (50) in accordance with a desired operation mode. The current amount adjustment circuit (51) includes at least two current sources (IS10) that are individually ON/OFF-controllable in accordance with a binary control signal representing the desired operation mode.Type: GrantFiled: May 9, 2014Date of Patent: March 26, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Munehiko Nagatani, Hideyuki Nosaka, Toshihiro Itoh, Koichi Murata, Hiroyuki Fukuyama, Takashi Saida, Shin Kamei, Hiroshi Yamazaki, Nobuhiro Kikuchi, Hiroshi Koizumi, Masafumi Nogawa, Hiroaki Katsurai, Hiroyuki Uzawa, Tomoyoshi Kataoka, Naoki Fujiwara, Hiroto Kawakami, Kengo Horikoshi, Yves Bouvier, Mikio Yoneyama, Shigeki Aisawa, Masahiro Suzuki
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Patent number: 10090921Abstract: A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n<m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.Type: GrantFiled: April 10, 2015Date of Patent: October 2, 2018Assignees: Nippon Telegraph And Telephone Corporation, NTT Electronics CorporationInventors: Mikio Yoneyama, Hiroto Kawakami, Takashi Ono, Akihiko Matsuura, Tomoyoshi Kataoka, Katsuya Tanaka, Masahiro Tachibana, Yuya Oyama
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Publication number: 20170117961Abstract: A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n<m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.Type: ApplicationFiled: April 10, 2015Publication date: April 27, 2017Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NTT Electronics CorporationInventors: Mikio YONEYAMA, Hiroto KAWAKAMI, Takashi ONO, Akihiko MATSUURA, Tomoyoshi KATAOKA, Katsuya TANAKA, Masahiro TACHIBANA, Yuya OYAMA
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Publication number: 20160223041Abstract: A brake disc of the present invention is a brake disc that stops the rotation of an axle when a brake pad is pressed on a surface of the brake disc, including a disc main body that is attached to a rotary body integrally rotating with the axle; and a plurality of build-up layers laminated on a surface of the disc main body, in which the build-up layers are laminated on the surface of the disc main body by means of laser metal deposition welding.Type: ApplicationFiled: September 12, 2014Publication date: August 4, 2016Applicants: RAILWAY TECHNICAL RESEARCH INSTITUTE, NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shin-ichi SAGA, Yasushi KARINO, Kazutaka ASABE, Atsushi SAKAGUCHI, Mikio YONEYAMA, Yoshihiro TATSUMI
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Publication number: 20160087727Abstract: An optical modulator driver circuit (1) includes an amplifier (50, Q10, Q11, R10-R13), and a current amount adjustment circuit (51) capable of adjusting a current amount of the amplifier (50) in accordance with a desired operation mode. The current amount adjustment circuit (51) includes at least two current sources (IS10) that are individually ON/OFF-controllable in accordance with a binary control signal representing the desired operation mode.Type: ApplicationFiled: May 9, 2014Publication date: March 24, 2016Inventors: Munehiko Nagatani, Hideyuki Nosaka, Toshihiro Itoh, Koichi Murata, Hiroyuki Fukuyama, Takashi Saida, Shin Kamei, Hiroshi Yamazaki, Nobuhiro Kikuchi, Hiroshi Koizumi, Masafumi Nogawa, Hiroaki Katsurai, Hiroyuki Uzawa, Tomoyoshi Kataoka, Naoki Fujiwara, Hiroto Kawakami, Kengo Horikoshi, Yves Bouvier, Mikio Yoneyama, Shigeki Aisawa, Masahiro Suzuki
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Patent number: 9122084Abstract: A phase modulation apparatus has a light source outputting continuous light, two phase modulators, and an intensity modulator. The phase modulation apparatus is provided with an RZ phase modulation circuit, in which the phase modulators phase-modulate the continuous light from the light source with data signals input to the phase modulators and generate two phase modulation optical signals, a phase shifter shifts the phase of one phase modulation optical signal by ?/2, and an intensity modulator intensity-modulates a multiplexed signal, combined with the other phase modulation optical signal, with an input clock signal CLK to convert the signal into an RZ signal, and, thus, to output the RZ signal, and a phase control circuit which adjusts the phases of the phase modulation optical signals generated by the phase modulator of the RZ phase modulation circuit so that the output of the RZ phase modulation circuit is maximum.Type: GrantFiled: April 26, 2013Date of Patent: September 1, 2015Assignees: NTT ELECTRONICS CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shigeru Ono, Kouichi Ogihara, Jun Endo, Mikio Yoneyama
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Publication number: 20140233084Abstract: A phase modulation apparatus has a light source outputting continuous light, two phase modulators, and an intensity modulator. The phase modulation apparatus is provided with an RZ phase modulation circuit, in which the phase modulators phase-modulate the continuous light from the light source with data signals input to the phase modulators and generate two phase modulation optical signals, a phase shifter shifts the phase of one phase modulation optical signal by ?/2, and an intensity modulator intensity-modulates a multiplexed signal, combined with the other phase modulation optical signal, with an input clock signal CLK to convert the signal into an RZ signal, and, thus, to output the RZ signal, and a phase control circuit which adjusts the phases of the phase modulation optical signals generated by the phase modulator of the RZ phase modulation circuit so that the output of the RZ phase modulation circuit is maximum.Type: ApplicationFiled: April 26, 2013Publication date: August 21, 2014Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NTT ELECTRONICS CORPORATIONInventors: Shigeru Ono, Kouichi Ogihara, Jun Endo, Mikio Yoneyama
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Publication number: 20120282480Abstract: A high-temperature material transferring member including a coating film formed on a surface of base metal, wherein the coating film is a composite coating film using a mixed powder made up of: a Co-based alloy powder containing, in mass %, 0.03 to 0.6% of C, 0.2 to 3% of Si, 22 to 35% of Cr, and more than 50% of Co; and a Cr carbide powder, the composite coating film is formed by the plasma powder overlaying process. The high-temperature material transferring member has excellent build-up resistance particularly in a gas atmosphere of 1100° C. or more. The high-temperature material transferring member has excellent in build-up resistance, oxidation resistance, and heat cracking resistance.Type: ApplicationFiled: May 17, 2012Publication date: November 8, 2012Applicant: Sumitomo Metal Industries, Ltd.Inventors: Yoshitaka Nishiyama, Tadashi Kawakami, Toshihide Ono, Mikio Yoneyama, Yoshihiro Tatsumi
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Patent number: 8005374Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: GrantFiled: March 12, 2010Date of Patent: August 23, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Patent number: 7995930Abstract: The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.Type: GrantFiled: May 19, 2006Date of Patent: August 9, 2011Assignees: NTT Electronics Corporation, Nippon Telegraph and Telephone CorporationInventors: Mikio Yoneyama, Fumiaki Saitou, Shigeru Ono, Yosuke Takeuchi, Kazushige Yonenaga, Shoichiro Kuwahara, Eiji Yoshida, Yutaka Miyamoto, Hiroto Kawakami
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Publication number: 20100172653Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: ApplicationFiled: March 12, 2010Publication date: July 8, 2010Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Patent number: 7734194Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: GrantFiled: March 17, 2005Date of Patent: June 8, 2010Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Publication number: 20090097867Abstract: The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.Type: ApplicationFiled: May 19, 2006Publication date: April 16, 2009Inventors: Mikio Yoneyama, Fumiaki Saitou, Shigeru Ono, Yosuke Takeuchi, Kazushige Yonenaga, Shoichiro Kuwahara, Eiji Yoshida, Yutaka Miyamoto, Hiroto Kawakami
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Patent number: 6934308Abstract: A precoding-multiplexing circuit is formed by a precoding circuit for carrying out a precoding with respect to n sets of parallel input binary data signals having a bit rate equal to R/n, to obtain n sets of parallel precoded signals, and a time division multiplexer for time division multiplexing the parallel precoded signals obtained by the precoding circuit, in units of one bit, and outputting time division multiplexed output signal having a bit rate equal to R. In this configuration, the encoding is realized by processing electric signals before the time division multiplexing, so that it becomes possible for the preceding circuit to handle signals which are slower than the transmission rate, and therefore it becomes easier to realize the higher transmission rate.Type: GrantFiled: February 2, 2000Date of Patent: August 23, 2005Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Mikio Yoneyama, Koichi Murata, Yutaka Miyamoto