Patents by Inventor Keiichi Horimoto
Keiichi Horimoto 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: 7836773Abstract: Optical fiber thermometer includes one optical fiber that relays light from the light source to a measuring unit, two parallel optical fibers that relay light from a mirror at the measuring unit to two light-receiving units, and an arithmetic processing circuit that calculates the temperature of the measuring unit from the ratio of electrical signals from the two light-receiving units; end surfaces of three optical fibers facing the reflecting face being fixed at an angle ? between the longitudinal direction of the optical fibers and the normal to the reflecting face that is not zero, the angle between the optical fibers for reception and projection being symmetrical based on the normal to the reflecting face. Each of the optical fibers is a single-mode fiber at the wavelength being used.Type: GrantFiled: April 17, 2009Date of Patent: November 23, 2010Assignee: Fujikura Ltd.Inventors: Akira Sakamoto, Keiichi Horimoto, Yoshikiyo Noguchi
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Patent number: 7615736Abstract: An optical sensor includes a light source, a sensing unit, a first optical fiber transmitting light from the light source to the sensing unit, second and third optical fibers transmitting the light from a reflecting surface of the sensing unit to light-receiving portions, and a calculation unit calculating physical quantities from electrical signals from the light-receiving portions. End surfaces of these fibers opposed to the reflecting surface are fixed so that the longitudinal direction thereof and the normal line of the reflecting surface form an angle ?, the second and third optical fibers are parallel to each other, and the fixing angles of the first optical fiber and the second and third optical fibers are symmetric about the normal line. These optical fibers have a single mode in the wavelength of which the optical fibers are used. A depolarizer is interposed between the light source and the first optical fiber.Type: GrantFiled: May 29, 2008Date of Patent: November 10, 2009Assignee: Fujikura Ltd.Inventors: Keiichi Horimoto, Akira Sakamoto, Yoshikiyo Noguchi
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Publication number: 20090257705Abstract: An optical sensor includes a light source, a sensing unit, a first optical fiber transmitting light from the light source to the sensing unit, second and third optical fibers transmitting the light from a reflecting surface of the sensing unit to light-receiving portions, and a calculation unit calculating physical quantities from electrical signals from the light-receiving portions. End surfaces of these fibers opposed to the reflecting surface are fixed so that the longitudinal direction thereof and the normal line of the reflecting surface form an angle ?, the second and third optical fibers are parallel to each other, and the fixing angles of the first optical fiber and the second and third optical fibers are symmetric about the normal line. These optical fibers have a single mode in the wavelength of which the optical fibers are used. A depolarizer is interposed between the light source and the first optical fiber.Type: ApplicationFiled: June 15, 2009Publication date: October 15, 2009Applicant: Fujikura Ltd.Inventors: Keiichi Horimoto, Akira Sakamoto, Yoshikiyo Noguchi
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Publication number: 20090199646Abstract: This optical fiber thermometer includes one optical fiber for projection that relays light from the light source to a measuring unit, two optical fibers for light-reception that relay light reflected from a reflecting face of a mirror provided at the measuring unit to two light-receiving units, and an arithmetic processing circuit that calculates the pressure of the measuring unit from the ratio of electrical signals from the two light-receiving units; end surfaces of three optical fibers arranged to face the reflecting face being fixed such that an angle ? between the longitudinal direction of the optical fibers and the normal to the reflecting face is not zero, the two optical fibers for light-reception being parallel, fixing angles between each of them and the optical fiber for projection being symmetrical based on the normal to the reflecting face as a reference, and each of the optical fibers being a single-mode fiber at the wavelength being used, According to this invention, it is possible to provide anType: ApplicationFiled: April 17, 2009Publication date: August 13, 2009Applicant: Fujikura Ltd.Inventors: Akira SAKAMOTO, Keiichi Horimoto, Yoshikiyo Noguchi
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Publication number: 20090001258Abstract: An optical sensor includes a light source, a sensing unit, a first optical fiber transmitting light from the light source to the sensing unit, second and third optical fibers transmitting the light from a reflecting surface of the sensing unit to light-receiving portions, and a calculation unit calculating physical quantities from electrical signals from the light-receiving portions. End surfaces of these fibers opposed to the reflecting surface are fixed so that the longitudinal direction thereof and the normal line of the reflecting surface form an angle ?, the second and third optical fibers are parallel to each other, and the fixing angles of the first optical fiber and the second and third optical fibers are symmetric about the normal line. These optical fibers have a single mode in the wavelength of which the optical fibers are used. A depolarizer is interposed between the light source and the first optical fiber.Type: ApplicationFiled: May 29, 2008Publication date: January 1, 2009Applicant: Fujikura Ltd.Inventors: Keiichi HORIMOTO, Akira Sakamoto, Yoshikiyo Noguchi
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Patent number: 7465916Abstract: One embodiment of the present invention provides an optical detection sensor configured so as to irradiate exit light emitted from a light source onto an object to be measured, the object being disposed a relative distance away from an end face of a first optical fiber, and receive the reflection light therefrom with a second and a third optical fiber, thereby computing a displacement amount of the object.Type: GrantFiled: October 19, 2006Date of Patent: December 16, 2008Assignee: Fujikura Ltd.Inventors: Keiichi Horimoto, Akira Sakamoto, Satoshi Okude
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Publication number: 20080093540Abstract: One embodiment of the present invention provides an optical detection sensor configured so as to irradiate exit light emitted from a light source onto an object to be measured, the object being disposed a relative distance away from an end face of a first optical fiber, and receive the reflection light therefrom with a second and a third optical fiber, thereby computing a displacement amount of the object.Type: ApplicationFiled: October 19, 2006Publication date: April 24, 2008Inventors: Keiichi Horimoto, Akira Sakamoto, Satoshi Okude