Patents by Inventor Junichi Nakagawa
Junichi Nakagawa 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: 7924076Abstract: Provided is a data recovery circuit including an input data phase detection circuit for outputting a gate signal synchronized with a rising phase of input data, a gated multiphase oscillator for instantly generating N-phase clocks based on the gate signal as a trigger, data discriminating and reproducing circuits for outputting sampled data of the input data which are synchronized with the clocks, a continuous clock generation circuit for generating a continuous clock which is a reference clock, continuous clock synchronization circuits for synchronizing the sampled data with the continuous clock and outputting the synchronized sampled data as phase synchronization data, and a phase selector for selecting the phase synchronization data having an optimum discrimination phase with the largest phase margin with respect to the input data and outputting the selected phase synchronization data as recovery data.Type: GrantFiled: September 4, 2006Date of Patent: April 12, 2011Assignee: Mitsubishi Electric CorporationInventors: Naoki Suzuki, Hitoyuki Tagami, Masamichi Nogami, Junichi Nakagawa
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Publication number: 20100189436Abstract: Provided is a point-to-multipoint optical communication system capable of extending a transmission distance between a subscriber apparatus and a station apparatus without changing wavelengths of an upstream optical signal and a downstream optical signal, which are used in both of the apparatuses. The point-to-multipoint optical communication system includes, as a basic configuration thereof, an optical network for connecting one station apparatus (1) to a plurality of (n) subscriber apparatuses (4). Among m basic configurations, one station-side wavelength multiplexer/demultiplexer (22), one optical fiber transmission line (30), and one subscriber-side wavelength multiplexer/demultiplexer (12) are shared. The point-to-multipoint optical communication system further includes a station-side repeating unit (20) and a subscriber-side repeating unit (10) each including the one wavelength multiplexer/demultiplexer (22 or 12) and m wavelength converters (21 or 11).Type: ApplicationFiled: July 18, 2007Publication date: July 29, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Junichi Nakagawa, Masamichi Nogami
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Publication number: 20100164575Abstract: Provided is a data recovery circuit including an input data phase detection circuit for outputting a gate signal synchronized with a rising phase of input data, a gated multiphase oscillator for instantly generating N-phase clocks based on the gate signal as a trigger, data discriminating and reproducing circuits for outputting sampled data of the input data which are synchronized with the clocks, a continuous clock generation circuit for generating a continuous clock which is a reference clock, continuous clock synchronization circuits for synchronizing the sampled data with the continuous clock and outputting the synchronized sampled data as phase synchronization data, and a phase selector for selecting the phase synchronization data having an optimum discrimination phase with the largest phase margin with respect to the input data and outputting the selected phase synchronization data as recovery data.Type: ApplicationFiled: September 4, 2006Publication date: July 1, 2010Applicant: Mitsubishi Electric CorporationInventors: Naoki Suzuki, Hitoyuki Tagami, Masamichi Nogami, Junichi Nakagawa
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Publication number: 20100067924Abstract: An optical receiver of wide-dynamic range characteristic that stably reproduces a burst signal having different light receiving levels. A preamplifier converts an output from a light receiving element into a voltage signal. A level detecting circuit includes: a first level detecting unit having a shorter time constant; and a second level detecting unit having a longer time constant and switching over to any of the level detecting units in response to a time constant switching signal to detect a voltage level of an output voltage signal output from the preamplifier. An amplifier variably controls conversion gain of the preamplifier based on the detecting result. A time constant switching control outputs the time constant switching signal to the level detecting unit based on the output voltage signal from the preamplifier, to select the first level detecting unit or the second detecting unit based on a number of consecutive identical digits being equal to, smaller, or larger than the predetermined number.Type: ApplicationFiled: December 21, 2006Publication date: March 18, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaki Noda, Masamichi Nogami, Junichi Nakagawa
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Publication number: 20090275728Abstract: A novel compound having histone deacetylase-inhibiting activity which is a cyclic tetrapeptide derivative represented by the general formula (1) given below and a pharmaceutical composition comprising such compound as an active ingredient.Type: ApplicationFiled: July 30, 2007Publication date: November 5, 2009Applicants: Kyushu Institute of Technology, RIKENInventors: Norikazu Nishino, Minoru Yoshida, Junichi Nakagawa
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Patent number: 7609980Abstract: A first average detecting circuit detects an average of output signals of a pre-amplifying unit that controls an amplification gain based on a result of comparison between an output of the first average detecting circuit and a predetermined reference voltage. A discriminating circuit receives an output signal of the pre-amplifying unit as an input signal and performs a signal discrimination of the input signal based on a threshold. A second average detecting circuit detects an average of input signals to the discriminating circuit. The discriminating circuit receives an output of the second average detecting circuit as the threshold.Type: GrantFiled: September 28, 2005Date of Patent: October 27, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masamichi Nogami, Junichi Nakagawa, Masaki Noda, Toyoaki Uo
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Publication number: 20090263133Abstract: In a downstream channel communication, an individual downstream channel wavelength is allocated to each group of user nodes, and for user nodes in a same group, a central office performs a downstream-signal communication by a same communication method using the individual downstream channel wavelength. In an upstream channel communication, all user nodes perform an upstream-signal communication with the central office using a single upstream channel. A downstream signal from the central office is distributed to the groups for each individual downstream channel wavelength, and upstream signals from the user nodes are transmitted to the central office in a multiplexing manner.Type: ApplicationFiled: August 30, 2006Publication date: October 22, 2009Applicants: MITSUBISHI ELECTRIC CORPORATION, KDDI CORPORATIONInventors: Junichi Nakagawa, Keiji Tanaka, Masato Kuwazuru, Noboru Edagawa
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Publication number: 20090252504Abstract: Provided is an optical receiver which has a wide dynamic range characteristic for stably reproducing packets having different light receiving levels, and which is superior in high-speed responsiveness and consecutive same binary symbols tolerance.Type: ApplicationFiled: March 3, 2006Publication date: October 8, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaki Noda, Masamichi Nogami, Junichi Nakagawa
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Patent number: 7592580Abstract: An input monitoring unit monitors full input light and outputs an input monitor signal. An output monitoring unit monitors full output light and outputs an output monitor signal. An ASE compensating circuit compensates for an ASE component contained in the output monitor signal. A gain-variation-level compensating circuit calculates a target average setup gain that is determined based on a signal intensity of the input monitor signal. A constant gain control circuit performs a gain control based on an output signal from the ASE compensating circuit and the target average setup gain.Type: GrantFiled: May 26, 2004Date of Patent: September 22, 2009Assignee: Mitsubishi Electric CorporationInventors: Naoki Suzuki, Junichi Nakagawa
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Patent number: 7539413Abstract: The present invention discloses a submarine observation system in which a plurality of carrier lights assigned to each submarine observation equipment is transmitted from a land terminal apparatus to an optical submarine cable (down-going) by using a WDM transmission. In the submarine observation equipment, only a prescribed carrier light is demultiplexed by an optical demultiplexer, an observation signal indicating an observation result is generated by an observation device, intensity of the carrier light demultiplexed by the optical demultiplexer is modulated by an optical amplifier based on an observation signal, and the modulated carrier light is multiplexed by an optical multiplexer. The multiplexed carrier light is output to the optical submarine cable (up-going) to be returned to the land terminal apparatus being the transmission station.Type: GrantFiled: March 14, 2005Date of Patent: May 26, 2009Assignees: Mitsubishi Denki Kabushiki Kaisha, Independent Administrative Institution, Japan Agency for Marine-Earth Science and TechnologyInventors: Hiroaki Munehira, Junichi Nakagawa, Toshiyuki Tokura, Kenichi Asakawa, Hitoshi Mikada, Katsuyoshi Kawaguchi
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Publication number: 20070188853Abstract: An input monitoring unit monitors full input light and outputs an input monitor signal. An output monitoring unit monitors full output light and outputs an output monitor signal. An ASE compensating circuit compensates for an ASE component contained in the output monitor signal. A gain-variation-level compensating circuit calculates a target average setup gain that is determined based on a signal intensity of the input monitor signal. A constant gain control circuit performs a gain control based on an output signal from the ASE compensating circuit and the target average setup gain.Type: ApplicationFiled: May 26, 2004Publication date: August 16, 2007Inventors: Naoki Suzuki, Junichi Nakagawa
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Publication number: 20070098416Abstract: A first average detecting circuit detects an average of output signals of a pre-amplifying unit that controls an amplification gain based on a result of comparison between an output of the first average detecting circuit and a predetermined reference voltage. A discriminating circuit receives an output signal of the pre-amplifying unit as an input signal and performs a signal discrimination of the input signal based on a threshold. A second average detecting circuit detects an average of input signals to the discriminating circuit. The discriminating circuit receives an output of the second average detecting circuit as the threshold.Type: ApplicationFiled: September 28, 2005Publication date: May 3, 2007Inventors: Masamichi Nogami, Junichi Nakagawa, Masaki Noda, Toyoaki Uo
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Patent number: 7175721Abstract: The invention relates to a method for producing high-performance Cr—Ti—V hydrogen storage alloys utilizing a thermit process, whereby residence of adversely affecting impurities is inhibited, addition of not less than 10 at % of Ti as an alloy component is realized, and thermal burden on the crucible used in the method is reduced. The method includes the steps of: (A) providing an alloy material (1) comprising a Cr oxide, a V oxide, and a reducing agent Al, and an alloy material (2) comprising Ti; (B) placing the alloy materials in a crucible for thermit reduction so that the alloy material (1) is placed above the alloy material (2); (C) igniting the alloy material (1) placed in step (B) and melting all metal elements contained in the alloy materials the with heat of the thermit reaction of the alloy material (1); and (D) making the alloy melt obtained in step (C) into an alloy.Type: GrantFiled: April 25, 2002Date of Patent: February 13, 2007Assignee: Santoku CorporationInventors: Hiroaki Takata, Yutaka Oka, Junichi Nakagawa, Akira Neoda
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Patent number: 7170673Abstract: Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of an optical amplifying repeater apparatus, whereon the light signals are demultiplexed or separated into individual bands and amplified by first to n-th fixed-gain optical amplifiers (#1, . . . , #n) each having a high fixed gain in the respective bands to be subsequently multiplexed by an optical multiplexer and then sent out onto a transmission line. A monitoring light branching device extracts a part of light power of a specific monitoring wavelength, which is then fed to an adjustable attenuator control circuit which controls the attenuation factor of the adjustable optical attenuator so that the light power of the specific wavelength remains constant. The gain of the optical amplifying repeater apparatus at the specific wavelength can thus be determined.Type: GrantFiled: November 17, 2003Date of Patent: January 30, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kuniaki Motoshima, Katsuhiro Shimizu, Junichi Nakagawa, Naoki Suzuki
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Patent number: 7103967Abstract: According to the present invention, in the field of packaging the chip component, increase in speed and stability in packaging the chip component is achieved without significantly increasing the cost of the device. The size of the suction face of the suction nozzle is set so as to be larger than the relevant chip component. Near the inserting position P of the chip component, a push cover is provided in close proximity to the upper surface of the carrier tape. A hole is provided in the push cover at the inserting position P, and the size of the hole is slightly larger than the size of the tip face of the suction nozzle. After the chip component held to the suction nozzle enters the component-accommodating recess of the carrier tape, the suction of the suction nozzle is released and the carrier tape starts to move in the direction shown with an arrow, orthogonal to the suction nozzle. The suction nozzle is raised after the opening of the component-accommodating recess is completely under the push cover.Type: GrantFiled: December 31, 2002Date of Patent: September 12, 2006Assignees: Ricoh Company, Ltd., FAT Corporation, PALMEC Inc.Inventors: Junichi Nakagawa, Yuuji Inoue
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Publication number: 20050259264Abstract: The present invention discloses a submarine observation system in which a plurality of carrier lights assigned to each submarine observation equipment is transmitted from a land terminal apparatus to an optical submarine cable (down-going) by using a WDM transmission. In the submarine observation equipment, only a prescribed carrier light is demultiplexed by an optical demultiplexer, an observation signal indicating an observation result is generated by an observation device, intensity of the carrier light demultiplexed by the optical demultiplexer is modulated by an optical amplifier based on an observation signal, and the modulated carrier light is multiplexed by an optical multiplexer. The multiplexed carrier light is output to the optical submarine cable (up-going) to be returned to the land terminal apparatus being the transmission station.Type: ApplicationFiled: March 14, 2005Publication date: November 24, 2005Applicants: MITSUBISHI DENKI KABUSHIKI KAISHA, Japan Agency for Marine-Earth Science and Tech.Inventors: Hiroaki Munehira, Junichi Nakagawa, Toshiyuki Tokura, Kenichi Asakawa, Hitoshi Mikada, Katsuyoshi Kawaguchi
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Publication number: 20050078621Abstract: A radio base station, comprising: a time slot preparing unit for preparing a time slot to be transmitted to a radio terminal; a selecting unit for selecting a modulation system and a coding method of the time slot prepared by the preparing unit; a signal processing unit for modulating and coding the time slot prepared by the preparing unit according to the modulation system and the coding method, which are selected by the selecting unit; an amplifying unit for amplifying a slot modulated and coded by the signal processing unit; a controlling unit for controlling the amplifying unit to amplify a transmitting power of a specified priority slot among the plurality of time slots so as to be larger than that of a non-priority slot; and an antenna unit for transmitting the time slot amplified by the amplifying unit.Type: ApplicationFiled: October 18, 2004Publication date: April 14, 2005Inventors: Toshiro Suzuki, Satoshi Takahashi, Junichi Nakagawa, Ken Takei
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Publication number: 20050078628Abstract: A radio base station, comprising: a time slot preparing unit for preparing a time slot to be transmitted to a radio terminal; a selecting unit for selecting a modulation system and a coding method of the time slot prepared by the preparing unit; a signal processing unit for modulating and coding the time slot prepared by the preparing unit according to the modulation system and the coding method, which are selected by the selecting unit; an amplifying unit for amplifying a slot modulated and coded by the signal processing unit; a controlling unit for controlling the amplifying unit to amplify a transmitting power of a specified priority slot among the plurality of time slots so as to be larger than that of a non-priority slot; and an antenna unit for transmitting the time slot amplified by the amplifying unit.Type: ApplicationFiled: October 18, 2004Publication date: April 14, 2005Inventors: Toshiro Suzuki, Satoshi Takahashi, Junichi Nakagawa, Ken Takei
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Patent number: 6873456Abstract: Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of an optical amplifying repeater apparatus, whereon the light signals are demultiplexed or separated into individual bands and amplified by first to n-th fixed-gain optical amplifiers (#1, . . . , #n) each having a high fixed gain in the respective bands to be subsequently multiplexed by an optical multiplexer and then sent out onto a transmission line. A monitoring light branching device extracts a part of light power of a specific monitoring wavelength, which is then fed to an adjustable attenuator control circuit which controls the attenuation factor of the adjustable optical attenuator so that the light power of the specific wavelength remains constant. The gain of the optical amplifying repeater apparatus at the specific wavelength can thus be determined.Type: GrantFiled: August 12, 2002Date of Patent: March 29, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kuniaki Motoshima, Katsuhiro Shimizu, Junichi Nakagawa, Naoki Suzuki
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Publication number: 20040134308Abstract: The invention relates to a method for producing high-performance Cr—Ti—V hydrogen storage alloys utilizing thermit process, whereby residence of adversely affecting impurities is inhibited, addition of not less than 10 at % of Ti as an alloy component is realized, and thermal burden on the crucible used in the method is reduced. The method includes the steps of: (A) providing an alloy material (1) comprising a Cr oxide, a V oxide, and a reducing agent Al, and an alloy material (2) comprising Ti; (B) placing said alloy materials in a crucible for thermit reduction so that the alloy material (1) is placed above the alloy material (2); (C) igniting the alloy material (1) placed in step (B) and melting all metal elements contained in the alloy materials with heat of thermit reaction of the alloy material (1); and (D) making an alloy melt obtained in step (C) into an alloy.Type: ApplicationFiled: October 24, 2003Publication date: July 15, 2004Inventors: Hiroaki Takata, Yutaka Oka, Junichi Nakagawa, Akira Neoda