Patents by Inventor Yusuke SHIGETA
Yusuke SHIGETA 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: 11888526Abstract: An optical transmitter includes an electro-optic modulator, a monitor circuit that monitors output light of the electro-optic modulator, and a processor that controls a bias voltage of the electro-optic modulator using a monitoring result of the monitor circuit, wherein the processor superimposes a first dither signal with a first frequency and a second dither signal with a second frequency different from the first frequency, onto one bias voltage in a time sharing manner, calculates a first control error based on a first component oscillating at the first frequency and a second control error based on a second component oscillating at the second frequency based on the monitoring result, and determines a control value for controlling the bias voltage using the first control error and the second control error.Type: GrantFiled: June 24, 2022Date of Patent: January 30, 2024Assignee: FUJITSU LIMITEDInventors: Shoichi Murakami, Kosuke Komaki, Hidetoshi Sato, Yuya Osumi, Yusuke Shigeta
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Patent number: 11840522Abstract: A method of stabilizing perfluoro(2-methylene-4-methyl-1,3-dioxolane) (hereinafter simply referred to as a “stabilization method”), including incorporating at least one selected from the group consisting of a hydroxy group-containing fluoroaromatic compound represented by General Formula (1) below and a hydroxy group-containing fluoroaromatic compound represented by General Formula (2) below into a composition containing perfluoro(2-methylene-4-methyl-1,3-dioxolane): (in the formula, R1 to R6 each independently represent one selected from the group consisting of a fluorine atom, a perfluoroalkyl group and a hydroxy group, and at least one of R1 to R6 is a hydroxy group); (in the formula, R7 to R14 each independently represent one selected from the group consisting of a fluorine atom, a perfluoroalkyl group and a hydroxy group, and at least one of R7 to R14 is a hydroxy group).Type: GrantFiled: December 20, 2019Date of Patent: December 12, 2023Assignees: TOSOH CORPORATION, TOSOH FINECHEM CORPORATIONInventors: Hideki Miyauchi, Shota Nishida, Daisuke Inoue, Yusuke Shigeta, Norihisa Kondo, Makoto Watanabe, Shohei Yumino, Tomoya Shimono
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Publication number: 20230224045Abstract: An optical receiver includes an optical filter that transmits signal light to be received from wavelength-multiplexed signal light, a light source that outputs local oscillation light, a 90-degree hybrid circuit that causes the local oscillation light output from the light source to interfere with the signal light transmitted through the optical filter to output interference signal light, a converter that converts the interference signal light into an electrical data signal, a spectrum detector that detects a frequency spectrum of the electrical data signal based on the electrical data signal, and a controller that controls a center frequency of a passband of the optical filter based on a shape of the frequency spectrum.Type: ApplicationFiled: October 26, 2022Publication date: July 13, 2023Applicant: Fujitsu LimitedInventors: Yusuke SHIGETA, Kosuke Komaki
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Publication number: 20230080354Abstract: An optical transmitter includes an electro-optic modulator, a monitor circuit that monitors output light of the electro-optic modulator, and a processor that controls a bias voltage of the electro-optic modulator using a monitoring result of the monitor circuit, wherein the processor superimposes a first dither signal with a first frequency and a second dither signal with a second frequency different from the first frequency, onto one bias voltage in a time sharing manner, calculates a first control error based on a first component oscillating at the first frequency and a second control error based on a second component oscillating at the second frequency based on the monitoring result, and determines a control value for controlling the bias voltage using the first control error and the second control error.Type: ApplicationFiled: June 24, 2022Publication date: March 16, 2023Applicant: FUJITSU LIMITEDInventors: Shoichi Murakami, Kosuke Komaki, Hidetoshi Sato, YUYA OSUMI, Yusuke SHIGETA
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Patent number: 11459410Abstract: The present invention provides a high-purity arylsulfonic acid amine salt vinyl monomer which is an extremely industrially useful arylsulfonic acid monomer with excellent storage stability and amphiphilic solubility in both water and organic solvents, a simple and practical method for producing the same, a polyarylsulfonic acid amine salt which is a polymer thereof, and a method for producing the same. In the arylsulfonic acid amine salt vinyl monomer, a tertiary amine having 2 or 3 different substituents that each have 1 to 7 carbon atoms and also containing at least one or more of tertiary carbon or quaternary carbon or cyclic skeleton in the structure is applied to an amine moiety thereof, and in addition, a polyarylsulfonic acid amine salt having high purity in terms of sulfonation rate and polymerization conversion rate and a polymer thereof are used.Type: GrantFiled: August 6, 2018Date of Patent: October 4, 2022Assignee: TOSOH FINECHEM CORPORATIONInventors: Yusuke Shigeta, Shinji Ozoe, Akihiro Fuji
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Publication number: 20220073661Abstract: Provided is a novel polystyrene-based polyampholyte having upper critical solution temperature (UCST)-type thermoresponsiveness and a method for producing the same. When monomers having halogenated vinylbenzyl trialkyl ammonium and p-styrenesulfonate as main components are radically polymerized in an aqueous solvent, a polyampholyte having an upper critical solution temperature is produced by optimizing the mole ratio between cationic groups and anionic groups and the amount of a radical initiator and a chain transfer agent to be added to thereby control the copolymer composition and the molecular weight.Type: ApplicationFiled: September 20, 2021Publication date: March 10, 2022Applicant: TOSOH FINECHEM CorporationInventors: Shinichi YUSA, Kanta Sharker KOMOL, Yuki OHARA, Yusuke SHIGETA, Shinji OZOE
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Publication number: 20220056006Abstract: A method of stabilizing perfluoro(2-methylene-4-methyl-1,3-dioxolane) (hereinafter simply referred to as a “stabilization method”), including incorporating at least one selected from the group consisting of a hydroxy group-containing fluoroaromatic compound represented by General Formula (1) below and a hydroxy group-containing fluoroaromatic compound represented by General Formula (2) below into a composition containing perfluoro(2-methylene-4-methyl-1,3-dioxolane): (in the formula, R1 to R6 each independently represent one selected from the group consisting of a fluorine atom, a perfluoroalkyl group and a hydroxy group, and at least one of R1 to R6 is a hydroxy group); (in the formula, R7 to R14 each independently represent one selected from the group consisting of a fluorine atom, a perfluoroalkyl group and a hydroxy group, and at least one of R7 to R14 is a hydroxy group).Type: ApplicationFiled: December 20, 2019Publication date: February 24, 2022Applicants: TOSOH CORPORATION, TOSOH FINECHEM CORPORATIONInventors: Hideki MIYAUCHI, Shota NISHIDA, Daisuke INOUE, Yusuke SHIGETA, Norihisa KONDO, Makoto WATANABE, Shohei YUMINO, Tomoya SHIMONO
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Publication number: 20220049748Abstract: Protruding portions protruding in a direction of approaching a disc rotor are integrally formed in a locking plate portion of a pad spring. Moreover, an insulating resin coating is formed on a front surface side (surface in a region opposed to an outer peripheral surface of the disc rotor) of the locking plate portion. The coating film formed on the front surface of the locking plate portion flows downward by its own weight before the coating material is solidified. As a result, the coating film formed on bottom surfaces (front surfaces of protrusions) of the protruding portions is thinner in film thickness than that of the coating film in other region.Type: ApplicationFiled: December 2, 2019Publication date: February 17, 2022Inventors: Takahito OSADA, Shigeru HAYASHI, Yorihito MIURA, Yusuke SHIGETA, Masahiko KAMESAWA
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Publication number: 20220002262Abstract: Provided is a method of producing perfluoro(2-methylene-4-methyl-1,3-dioxolane), the method including at least following processes (1) to (3): (1) reacting at least one of perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane) and a hydrolysis product thereof with a basic aqueous solution containing one or more cations selected from the group consisting of alkali metal ions and alkaline earth metal ions and then separating a liquid containing produced perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts by a liquid separation operation; (2) performing one or more water content reduction treatments selected from the group consisting of water evaporation and water adsorption on the liquid containing the obtained perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts to obtain perfluoro(2,4-diType: ApplicationFiled: November 6, 2019Publication date: January 6, 2022Applicants: TOSOH CORPORATION, TOSOH FINECHEM CORPORATIONInventors: Hideki MIYAUCHI, Hiroshi MATSUO, Yuichi MIYASHITA, Akihiro FUJI, Yusuke SHIGETA, Shota NISHIDA, Norihisa KONDO, Makoto WATANABE
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Patent number: 10743772Abstract: This optoacoustic imaging device is provided with: a light source part for irradiating an object to be inspected with light; an ultrasonic vibrator for detecting an acoustic wave generated from a subject to be detected in the object to be inspected which has absorbed the light emitted from the light source part; and a detecting part disposed in a probe body and including an acoustic lens disposed closer to the tip side of the probe body than the ultrasonic vibrator, wherein the acoustic lens is configured to have a light absorbance of 1-30% and a light reflectance of less than 85% with respect to light which has a wavelength band of 650-1000 nm and is emitted from the light source part.Type: GrantFiled: August 31, 2016Date of Patent: August 18, 2020Assignee: CYBERDYNE Inc.Inventor: Yusuke Shigeta
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Publication number: 20200172643Abstract: The present invention provides a high-purity arylsulfonic acid amine salt vinyl monomer which is an extremely industrially useful arylsulfonic acid monomer with excellent storage stability and amphiphilic solubility in both water and organic solvents, a simple and practical method for producing the same, a polyarylsulfonic acid amine salt which is a polymer thereof, and a method for producing the same. In the arylsulfonic acid amine salt vinyl monomer, a tertiary amine having 2 or 3 different substituents that each have 1 to 7 carbon atoms and also containing at least one or more of tertiary carbon or quaternary carbon or cyclic skeleton in the structure is applied to an amine moiety thereof, and in addition, a polyarylsulfonic acid amine salt having high purity in terms of sulfonation rate and polymerization conversion rate and a polymer thereof are used.Type: ApplicationFiled: August 6, 2018Publication date: June 4, 2020Inventors: Yusuke SHIGETA, Shinji OZOE, Akihiro FUJI
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Publication number: 20180263500Abstract: This optoacoustic imaging device is provided with: a light source part for irradiating an object to be inspected with light; an ultrasonic vibrator for detecting an acoustic wave generated from a subject to be detected in the object to be inspected which has absorbed the light emitted from the light source part; and a detecting part disposed in a probe body and including an acoustic lens disposed closer to the tip side of the probe body than the ultrasonic vibrator, wherein the acoustic lens is configured to have a light absorbance of 1-30% and a light reflectance of less than 85% with respect to light which has a wavelength band of 650-1000 nm and is emitted from the light source part.Type: ApplicationFiled: August 31, 2016Publication date: September 20, 2018Applicant: PreXion CorporationInventor: Yusuke SHIGETA
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Publication number: 20170258333Abstract: This photoacoustic wave detector is provided with: an internal light source (212) that comprises an LED element (212a) to be inserted into the interior of a subject (P) and that irradiates an object to be detected (Q) within the subject with light emitted from the LED element; and an internal acoustoelectric conversion unit (22) that detects a photoacoustic wave generated at the object to be detected in the interior of the subject (150) and generates an internal detection signal that is based on the detection result of the photoacoustic wave (AW).Type: ApplicationFiled: August 21, 2015Publication date: September 14, 2017Inventor: Yusuke SHIGETA
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Publication number: 20160058293Abstract: This photoacoustic imager includes a detection portion, a light-emitting semiconductor element light source portion arranged in proximity to the detection portion, and a sealing portion configured to propagate an acoustic wave generated by a detection object to the detection portion by sealing a surface of the detection portion on a front side in a detection direction where a specimen is arranged with respect to the detection portion and arranged on the front side in the detection direction where the specimen is arranged with respect to the detection portion.Type: ApplicationFiled: July 2, 2015Publication date: March 3, 2016Inventor: Yusuke SHIGETA
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Publication number: 20160058289Abstract: An optoacoustic imaging device has an optoacoustic wave detector, a cross-sectional image generator, and an image former. The optoacoustic wave detector has a light source for irradiating a light absorber inside a tested object with light, and has an acoustoelectric converter. The acoustoelectric converter detects, and generates a detection signal of, an optoacoustic wave generated by the light absorber. The acoustoelectric converter has a plurality of detecting elements arrayed one-dimensionally, and the light source includes light-emitting elements arranged at least between adjacent ones of the detecting elements. The cross-sectional image generator generates a cross-sectional image of the tested object based on the detection signal, and the image former forms an optoacoustic image based on the cross-sectional image.Type: ApplicationFiled: June 29, 2015Publication date: March 3, 2016Inventor: Yusuke SHIGETA