Patents by Inventor Tsukasa Hosokawa
Tsukasa Hosokawa 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: 20240085253Abstract: An object of the present invention is to provide a strain amount detection device capable of accurately detecting deformations, in multiple directions, of a tire by one strain measuring element. A strain amount detection device according to the present invention includes a disk-shaped base member that holds a strain measuring element, in which the base member acts as a strain body by transmitting strain of a tire to the strain measuring element.Type: ApplicationFiled: August 31, 2021Publication date: March 14, 2024Applicant: Hitachi Astemo, Ltd.Inventors: Kenji YOSHIHARA, Hiroyuki ABE, Tsukasa TAKAHASHI, Takeo HOSOKAWA
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Patent number: 11667560Abstract: A manufacturing method for an optical fiber, includes: drawing, while heating in a heating furnace, a lower end of an optical fiber preform that is to be an optical fiber having a core consisting of silica glass containing a rare earth element compound. The heating furnace has a temperature profile in which a temperature of the heating furnace increases to a maximum temperature Tmax and then decreases from an upstream side of the heating furnace toward a downstream side of the heating furnace. The temperature profile has a changing point at which the temperature decreases more steeply on the downstream side from a position where the maximum temperature Tmax is reached. At the maximum temperature, a temperature of the silica glass is higher than or equal to a glass transition temperature and the silica glass is in a single phase.Type: GrantFiled: September 17, 2019Date of Patent: June 6, 2023Assignee: Fujikura Ltd.Inventor: Tsukasa Hosokawa
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Publication number: 20220271494Abstract: An active element added-optical fiber includes a core, having a radius d and including a first region and a second region, and a cladding that surrounds an outer peripheral surface of the core without a gap and propagates light in a few mode. The first region is a region from a central axis of the core to a radius ra and contains ytterbium as an active element. The second region is a region to the radius d that surrounds the first region without a gap and contains a plurality of dopants, one of which is germanium. The active element is not added to a region within the second region from a radius rc to the radius d. The germanium is not added to a region within the first region from the central axis to a radius rb, and a concentration of the germanium is highest among the plurality of dopants.Type: ApplicationFiled: February 22, 2021Publication date: August 25, 2022Applicant: FUJIKURA LTD.Inventors: Tsukasa Hosokawa, Rintaro Kitahara, Ryoichi Nishimura
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Publication number: 20210292223Abstract: A manufacturing method for an optical fiber, includes: drawing, while heating in a heating furnace, a lower end of an optical fiber preform that is to be an optical fiber having a core consisting of silica glass containing a rare earth element compound. The heating furnace has a temperature profile in which a temperature of the heating furnace increases to a maximum temperature Tmax and then decreases from an upstream side of the heating furnace toward a downstream side of the heating furnace. The temperature profile has a changing point at which the temperature decreases more steeply on the downstream side from a position where the maximum temperature Tmax is reached. At the maximum temperature, a temperature of the silica glass is higher than or equal to a glass transition temperature and the silica glass is in a single phase.Type: ApplicationFiled: September 17, 2019Publication date: September 23, 2021Applicant: Fujikura Ltd.Inventor: Tsukasa Hosokawa
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Patent number: 9698557Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.Type: GrantFiled: March 7, 2016Date of Patent: July 4, 2017Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATIONInventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
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Patent number: 9673589Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as ?max, under conditions in which the cutoff wavelength of the highest mode light beam is defined as ?c, a shortest wavelength of the wavelength range is defined as ?min, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is ?min. ?c>0.5 ?min+0.5 ?max??(1).Type: GrantFiled: August 15, 2016Date of Patent: June 6, 2017Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATIONInventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
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Publication number: 20170054266Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as ?max, under conditions in which the cutoff wavelength of the highest mode light beam is defined as ?c, a shortest wavelength of the wavelength range is defined as ?min, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is ?min. ?c>0.5 ?min+0.Type: ApplicationFiled: August 15, 2016Publication date: February 23, 2017Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATIONInventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
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Publication number: 20160268757Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.Type: ApplicationFiled: March 7, 2016Publication date: September 15, 2016Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATIONInventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
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Patent number: 8162328Abstract: By bending and stretching a link mechanism, both left and right wheels of a vehicle can be inclined toward inside of cornering to generate a camber thrust as a lateral force, i.e. an increase in cornering force. Further, by bending and stretching the link mechanism, the passenger compartment can be inclined in accordance with inclination of a connecting link, and thus the center of gravity of the vehicle can be moved toward its inner wheel during cornering. By preventing lifting of the inner wheel during cornering, cornering performance is improved. Because the passenger compartment is inclined toward the inner wheel during cornering, centrifugal force is less likely to be felt by the occupant.Type: GrantFiled: October 31, 2006Date of Patent: April 24, 2012Assignee: Kabushikikaisha Equos ResearchInventors: Munehisa Horiguchi, Masahiro Hasebe, Nobuaki Miki, Takumi Tachibana, Takashi Naito, Katsunori Doi, Tsukasa Hosokawa
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Publication number: 20090256331Abstract: By bending and stretching a link mechanism, both left and right wheels of a vehicle can be inclined toward inside of cornering to generate a camber thrust as a lateral force, i.e. an increase in cornering force. Further, by bending and stretching the link mechanism, the passenger compartment can be inclined in accordance with inclination of a connecting link, and thus the center of gravity of the vehicle can be moved toward its inner wheel during cornering. By preventing lifting of the inner wheel during cornering, cornering performance is improved. Because the passenger compartment is inclined toward the inner wheel during cornering, centrifugal force is less likely to be felt by the occupant.Type: ApplicationFiled: October 31, 2006Publication date: October 15, 2009Applicant: Kabushikikaisha Equos ResearchInventors: Munehisa Horiguchi, Masahiro Hasebe, Nobuaki Miki, Takumi Tachibana, Takashi Naito, Katsunori Doi, Tsukasa Hosokawa