Patents by Inventor Manabu Kudoh
Manabu Kudoh 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: 20210124138Abstract: A light source device includes: a light source that outputs laser light; an optical fiber that includes: a proximal end on which the laser light is incident and a distal end portion including a distal end and a distal end surface at the distal end; a fixing member that fixes the optical fiber by surrounding an entire circumference of the distal end portion; and an optical component disposed at a position through which an extension line of the optical fiber at the distal end of the optical fiber passes.Type: ApplicationFiled: April 3, 2018Publication date: April 29, 2021Applicant: Fujikura Ltd.Inventors: Yoshihiro Tabata, Manabu Kudoh, Katsuyuki Seto, Kazuya Hiramatsu
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Publication number: 20180224598Abstract: A multicore optical fiber that includes: a core that is formed of silica glass doped with at least fluorine, the core having a relative refractive index difference with respect to a refractive index of silica as a reference being ?0.30% to ?0.10%; and a clad that is formed of silica glass doped with at least fluorine. The clad includes a first clad surrounding an outer periphery of the core and a second clad provided outside the first clad. A relative refractive index difference between the first clad and the core is 0.8% or more. A refractive index of the second clad is higher than a refractive index of the first clad and lower than a refractive index of the core.Type: ApplicationFiled: July 25, 2016Publication date: August 9, 2018Applicant: FUJIKURA LTD.Inventors: Yutaka Endoh, Tomoaki Toriya, Katsuaki Izoe, Manabu Kudoh, Tsuyoshi Shimomichi
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Patent number: 8958677Abstract: A polarization-maintaining optical fiber of the present invention includes a core, a pair of stress-applying parts provided on both sides of the core, and a cladding surrounding the core and the stress-applying parts, and is used in a wavelength range of 400 to 680 nm. The diameter of the cladding is 125 ?m, the diameter of the stress-applying part is 33 to 37 ?m, a distance between the pair of stress-applying parts is 8.6 to 15.4 ?m, a relative refractive index difference between the core and the cladding is 0.35 to 0.45%, and a cut-off wavelength is less than or equal to 400 nm.Type: GrantFiled: April 3, 2013Date of Patent: February 17, 2015Assignee: Fujikura Ltd.Inventors: Kazuyuki Hayashi, Katsuaki Izoe, Yutaka Endoh, Kazuhiko Aikawa, Manabu Kudoh
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Patent number: 8873915Abstract: A low-loss optical fiber over wide wavelength range includes a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm, and being manufactured by drawing an optical fiber preform including a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %.Type: GrantFiled: May 9, 2013Date of Patent: October 28, 2014Assignee: Fujikura Ltd.Inventors: Kazuhiko Aikawa, Masahiro Asano, Kazuyuki Hayashi, Masami Miyachi, Manabu Kudoh
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Patent number: 8641274Abstract: The polarization-maintaining fiber of the invention includes a core (1) made of germanium doped silica glass; a stress-applying part (3) made of boron doped silica glass; a cladding (2) made of pure silica glass; and a polyimide coating layer (4) with a thickness of 10 ?m or less that surrounds the outer periphery of the cladding (2).Type: GrantFiled: May 20, 2011Date of Patent: February 4, 2014Assignee: Fujikura Ltd.Inventors: Koji Omichi, Yoshihiro Terada, Yutaka Endoh, Kazuyuki Hayashi, Katsuaki Izoe, Kazuhiko Aikawa, Manabu Kudoh
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Publication number: 20130302001Abstract: A low-loss optical fiber over wide wavelength range includes a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm, and being manufactured by drawing an optical fiber preform including a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %.Type: ApplicationFiled: May 9, 2013Publication date: November 14, 2013Applicant: FUJIKURA LTD.Inventors: Kazuhiko AIKAWA, Masahiro ASANO, Kazuyuki HAYASHI, Masami MIYACHI, Manabu KUDOH
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Publication number: 20120044971Abstract: The polarization-maintaining fiber of the invention includes a core (1) made of germanium doped silica glass; a stress-applying part (3) made of boron doped silica glass; a cladding (2) made of pure silica glass; and a polyimide coating layer (4) with a thickness of 10 ?m or less that surrounds the outer periphery of the cladding (2).Type: ApplicationFiled: May 20, 2011Publication date: February 23, 2012Applicant: FUJIKURA LTD.Inventors: Koji OMICHI, Yoshihiro Terada, Yutaka Endoh, Kazuyuki Hayashi, Katsuaki Izoe, Kazuhiko Aikawa, Manabu Kudoh
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Patent number: 7813607Abstract: An optical fiber bundle unit is provided for transmitting ultraviolet light in which the increase of the transmission loss caused by radicals generated in the optical fiber by irradiation or transmission of ultraviolet light is suppressed and a stable energy state is maintained even after the irradiation or transmission of ultraviolet light. The optical fiber bundle unit for transmitting ultraviolet light includes an optical fiber bundle and a sealed container in which the optical fiber bundle is held. A diffusion of hydrogen gas is suppressed by putting the optical fiber bundle pretreated in a hydrogen atmosphere into the sealed container, followed by filling the sealed container with a mixed gas including a hydrogen gas and a gas which is not combustible, will not support combustion, and will not explode.Type: GrantFiled: March 17, 2005Date of Patent: October 12, 2010Assignee: Fujikura Ltd.Inventors: Ken-ichi Nakatate, Tomoaki Toriya, Manabu Kudoh, Katsuyuki Seto, Takashi Tsumanuma
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Patent number: 7440673Abstract: A radiation resistant single-mode optical fiber has a core and a cladding, each made of fluorine-doped silica glass, in which a chlorine concentration of the core is at least 0.01 ppm, a relative refractive index difference of the core based on the refractive index for silica is between ?0.30% and ?0.10%, a relative refractive index difference of the core based on the refractive index for the cladding is between 0.3% and 0.5%, a cutoff wavelength is 1.27 ?m or below, and a bending loss at a wavelength of 1.3 ?m and a bending diameter of 20 mm is 0.5 dB/m or less.Type: GrantFiled: April 12, 2007Date of Patent: October 21, 2008Assignee: Fujikura Ltd.Inventors: Kazuhiko Aikawa, Katsuaki Izoe, Naoki Shamoto, Manabu Kudoh, Takashi Tsumanuma
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Patent number: 7430353Abstract: A polarization-maintaining optical fiber comprises: a core; a pair of stress-applying parts disposed one at each side of the core; and a cladding which surrounds the core and the stress-applying parts; wherein when the polarization-maintaining optical fiber is used at a wavelength of 0.81 ?m to 0.87 ?m, a cut-off wavelength measured with a fiber length of 2 m is longer than the wavelength used and polarization crosstalk when a fiber having a length of 1,000 m is wound on a reel having a diameter of 40 mm is equal to or less than ?35 dB/100 m.Type: GrantFiled: June 26, 2006Date of Patent: September 30, 2008Assignee: Fujikura Ltd.Inventors: Kazuhiko Aikawa, Katsuaki Izoe, Kazuyuki Hayashi, Manabu Kudoh
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Publication number: 20070274666Abstract: A radiation resistant single-mode optical fiber has a core and a cladding, each made of fluorine-doped silica glass, in which a chlorine concentration of the core is at least 0.01 ppm, a relative refractive index difference of the core based on the refractive index for silica is between ?0.30 and ?0.10%, a relative refractive index difference of the core based on the refractive index for the cladding is between 0.3% and 0.5%, a cutoff wavelength is 1.27 ?m or below, and a bending loss at a wavelength of 1.3 ?m and a bending diameter of 20 mm is 0.5 dB/m or less.Type: ApplicationFiled: April 12, 2007Publication date: November 29, 2007Applicant: FUJIKURA LTDInventors: Kazuhiko AIKAWA, Katsuaki Izoe, Naoki Shamoto, Manabu Kudoh, Takashi Tsumanuma
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Publication number: 20070116417Abstract: A polarization-maintaining optical fiber comprises: a core; a pair of stress-applying parts disposed one at each side of the core; and a cladding which surrounds the core and the stress-applying parts; wherein when the polarization-maintaining optical fiber is used at a wavelength of 0.81 ?m to 0.87 ?m, a cut-off wavelength measured with a fiber length of 2 m is longer than the wavelength used and polarization crosstalk when a fiber having a length of 1,000 m is wound on a reel having a diameter of 40 mm is equal to or less than ?35 dB/100 m.Type: ApplicationFiled: June 26, 2006Publication date: May 24, 2007Inventors: Kazuhiko Aikawa, Katsuaki Izoe, Kazuyuki Hayashi, Manabu Kudoh
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Publication number: 20050238302Abstract: An optical fiber bundle unit is provided for transmitting ultraviolet light in which the increase of the transmission loss caused by radicals generated in the optical fiber by irradiation or transmission of ultraviolet light is suppressed and a stable energy state is maintained even after the irradiation or transmission of ultraviolet light. The optical fiber bundle unit for transmitting ultraviolet light includes an optical fiber bundle and a sealed container in which the optical fiber bundle is held, wherein the sealed container contains a hydrogen gas.Type: ApplicationFiled: March 17, 2005Publication date: October 27, 2005Inventors: Ken-ichi Nakatate, Tomoaki Toriya, Manabu Kudoh, Katsuyuki Seto, Takashi Tsumanuma
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Patent number: 6892012Abstract: An optical fiber bundle unit is provided for transmitting ultraviolet light in which the increase of the transmission loss caused by radicals generated in the optical fiber by irradiation or transmission of ultraviolet light is suppressed and a stable energy state is maintained even after the irradiation or transmission of ultraviolet light. The optical fiber bundle unit for transmitting ultraviolet light includes an optical fiber bundle and a sealed container in which the optical fiber bundle is held, wherein the sealed container contains a hydrogen gas.Type: GrantFiled: April 9, 2002Date of Patent: May 10, 2005Assignee: Fujikura, Ltd.Inventors: Ken-ichi Nakatate, Tomoaki Toriya, Manabu Kudoh, Katsuyuki Seto, Takashi Tsumanuma
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Publication number: 20020172479Abstract: An optical fiber bundle unit is provided for transmitting ultraviolet light in which the increase of the transmission loss caused by radicals generated in the optical fiber by irradiation or transmission of ultraviolet light is suppressed and a stable energy state is maintained even after the irradiation or transmission of ultraviolet light. The optical fiber bundle unit for transmitting ultraviolet light includes an optical fiber bundle and a sealed container in which the optical fiber bundle is held, wherein the sealed container contains a hydrogen gas.Type: ApplicationFiled: April 9, 2002Publication date: November 21, 2002Inventors: Ken-Ichi Nakatate, Tomoaki Toriya, Manabu Kudoh, Katsuyuki Seto, Takashi Tsumanuma
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Patent number: 6379802Abstract: A thermoplastic skin sheet constituted by (a) a thermoplastic polyolefin or elastomer sheet; (b) a primer layer coated on the sheet, the primer being based on a modified polyolefin resin containing 2 mg-equivalent/g or less of a hydroxyl group or a carboxyl group; and (c) a topcoat layer coated on the primer layer. The topcoat layer may be mainly composed of (a) 100 parts by weight of a polycarbonate polyurethane resin having a number-average molecular weight of 8,000 or more and a 100% modulus of 20 kg/cm2 or more, and (b) 0.1-40 parts by weight of a (meth)acrylate-butadiene-styrene resin. The surface of the topcoat layer may be subjected to embossing.Type: GrantFiled: June 22, 1999Date of Patent: April 30, 2002Assignees: Honda Giken Kogyo Kabushiki Kaisha, Tokusho Shikiryo Color & Chemicals, Inc.Inventors: Sukekuni Ito, Keiichi Honjo, Masami Imada, Manabu Kudoh
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Publication number: 20020006516Abstract: A thermoplastic skin sheet constituted by (a) a thermoplastic polyolefin or elastomer sheet; (b) a primer layer coated on the sheet, the primer being based on a modified polyolefin resin containing 2 mg-equivalent/g or less of a hydroxyl group or a carboxyl group; and (c) a topcoat layer coated on the primer layer. The topcoat layer may be mainly composed of (a) 100 parts by weight of a polycarbonate polyurethane resin having a number-average molecular weight of 8,000 or more and a 100% modulus of 20 kgf/cm2 or more, and (b) 0.140 parts by weight of a (meth)acrylate-butadiene-styrene resin. The surface of the topcoat layer may be subjected to embossing.Type: ApplicationFiled: June 22, 1999Publication date: January 17, 2002Inventors: SUKEKUNI ITO, KEIICHI HONJO, MASAMI IMADA, MANABU KUDOH