Patents by Inventor Tatsuo Teraoka
Tatsuo Teraoka 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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Optical fiber end processing method and optical fiber end processing apparatus and optical fiber end
Patent number: 8764317Abstract: An optical fiber end processing method includes fixing two portions of an optical fiber, heating and fusing the optical fiber between the two fixed portions, to form a first heat fusion region, heating and fusing the optical fiber fixed between the two fixed portions unit while fixing the two fixed portions, moving a heat fusion unit from a side of the first heat fusion region toward a base end side of the optical fiber, and pushing a heat fusion portion of the optical fiber in a direction of shortening a length of the heat fusion portion, to form a second heat fusion region continuous to the first heat fusion region and in which the air holes of the optical fiber disappear; and removing the first heat fusion region by cutting the optical fiber within the second heat fusion region after the second heat fusion forming.Type: GrantFiled: December 14, 2011Date of Patent: July 1, 2014Assignee: Hitachi Metals, Ltd.Inventors: Masao Tachikura, Noribumi Shiina, Tatsuo Teraoka, Yoshiyuki Hiramoto, Mitsumasa Zobuchi, Fumi Miyata -
OPTICAL FIBER END PROCESSING METHOD AND OPTICAL FIBER END PROCESSING APPARATUS AND OPTICAL FIBER END
Publication number: 20120170901Abstract: An optical fiber end processing method includes fixing two portions of an optical fiber, heating and fusing the optical fiber between the two fixed portions, to form a first heat fusion region, heating and fusing the optical fiber fixed between the two fixed portions unit while fixing the two fixed portions, moving a heat fusion unit from a side of the first heat fusion region toward a base end side of the optical fiber, and pushing a heat fusion portion of the optical fiber in a direction of shortening a length of the heat fusion portion, to form a second heat fusion region continuous to the first heat fusion region and in which the air holes of the optical fiber disappear; and removing the first heat fusion region by cutting the optical fiber within the second heat fusion region after the second heat fusion forming.Type: ApplicationFiled: December 14, 2011Publication date: July 5, 2012Applicant: Hitachi Cable, Ltd.Inventors: Masao Tachikura, Noribumi Shiina, Tatsuo Teraoka, Yoshiyuki Hiramoto, Mitsumasa Zobuchi, Fumi Miyata -
Publication number: 20060171644Abstract: An optical fiber cable comprises optical fiber tapes, each of which is composed of a plurality of optical fiber cores disposed in parallel and connected by a joint member, and two or more pieces of the optical fiber tapes are layered and accommodated in a sheath. The optical fiber tape is provided with a concave portion between adjacent optical fiber cores and a convex portion, and the two or more pieces of the optical fiber tapes are layered by engaging the concave portion and convex portion to be accommodated in the sheath.Type: ApplicationFiled: December 15, 2005Publication date: August 3, 2006Applicant: Hitachi Cable, Ltd.Inventors: Takahiro Sato, Tatsuo Teraoka, Yoshihiro Kodaka
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Patent number: 6549696Abstract: An optical wavelength multiplexer/demultiplexer includes a substrate, an input channel waveguide, an input slab waveguide, a channel waveguide array which has a plurality of channel waveguides, each channel waveguide differing in length from its neighboring waveguide by predetermined amount, an output slab waveguide, and a plurality of output channel waveguides. The input slab waveguide or output slab waveguide have a temperature compensation material, in its light path, having an opposite sign of diffraction temperature change to the plurality of channel wave guides, or a material capable of canceling a change in the in-phase plane of light having each wavelength which occurs in a vicinity of the channel waveguide array and the slab waveguide, or a waveguide for band width adjustment on which a waveguide to adjust band width of wavelength multiplexing light is provided.Type: GrantFiled: August 8, 2000Date of Patent: April 15, 2003Assignee: Hitachi Cable, Ltd.Inventors: Hisato Uetsuka, Masahiro Okawa, Koichi Maru, Hideki Nounen, Tatsuo Teraoka
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Patent number: 6455944Abstract: An optical assembly has a substrate and an optical device chip. On mutually opposed surfaces of the optical device chip and the substrate, indexes having slope faces are formed. Index passage alignment is performed by using the indexes as positioning reference and by using image measurement.Type: GrantFiled: September 5, 1995Date of Patent: September 24, 2002Assignees: Hitachi, Ltd., Hitachi Cable Ltd.Inventors: Takeshi Kato, Tatsuo Teraoka, Satoru Kikuchi, Masahiro Aoki, Yoshitada Oshida
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Patent number: 5903697Abstract: An optical waveguide 3 comprises a substrate like a Si substrate having a projection with a flat surface and inclined side surfaces thereon, a buffer layer having a refractive index of n.sub.0 formed on lower surfaces of the substrate, a secondary buffer layer having a refractive index of n.sub.0 formed on the buffer layer, a core waveguide having a refractive index of n.sub.1 formed on the secondary buffer layer and a cladding layer having a refractive index of n.sub.0 covering the core waveguide. The flat surface of the projection 31 is exposed through an opening. The secondary buffer layer controls a transmission loss increase caused by partial thickness differences of the ground buffer layer or scattering by scratches or strains created by the grind.Type: GrantFiled: July 22, 1997Date of Patent: May 11, 1999Assignees: Hitachi Ltd., Hitachi Cable, Ltd., Nippon Telegraph and Telephone CorporationInventors: Yasufumi Yamada, Masahiro Yanagisawa, Hiroaki Okano, Keiichi Higuchi, Hisato Uetsuka, Tatsuo Teraoka, Satoshi Aoki, Yasunori Iwafuji
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Patent number: 5519799Abstract: In an optical fiber array structure, a ferrule is provided around an optical fiber array. The ferrule has an outer configuration defined by combination of, preferably, two circles. Thus, eye glass-shaped outer configuration is obtained for the ferrule. The adapter has an aperture for receiving the ferrule, and the aperture has an inner configuration which is complementary with the outer configuration of the ferrule.Type: GrantFiled: November 8, 1994Date of Patent: May 21, 1996Assignees: Hitachi Cable, Ltd., Hitachi, Ltd.Inventors: Kazuya Murakami, Tatsuo Teraoka, Shin-ichi Kajiyama, Takeshi Kato
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Patent number: 5357339Abstract: Each fiber-optic gyroscope unit is shaped like a tetragonal cone. A square plate (51) is used as a base which holds a light source module (52), a light receiving unit (detector) (53) and an optical fiber coil (54). Directional couplers (56a), (56b) are also mounted on the base (51). A phase modulator (55) which includes a piezoelectric element is disposed inside the optical fiber coil (54). A signal processing circuit board (58) which has pedestals (59) stands on the base (51) such that it positions above the optical fiber coil (54). A polarizer (510) is wound around the optical fiber coil (54). A reinforcement member (511) is also provided. All these components are so arranged as not to extend out of the tetragonal cone (OABCO*) which defines its own unit region. Three identical fiber-optic gyroscope units are combined by connecting members (512, 513, 514) to form a single fiber-optic gyroscope to detect rotational angular velocities about three orthogonal axes.Type: GrantFiled: June 24, 1992Date of Patent: October 18, 1994Assignee: Hitachi Cable LimitedInventors: Tatsuo Teraoka, Yoshiyuki Hiramoto, Hirokazu Shiga, Shigeo Toya
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Patent number: 5318215Abstract: A method of manufacturing a metal pipe clad cable having a fiber with an excess length housed therein, comprises the steps of preparing a metal pipe clad cable comprising a metal pipe and a fiber housed in the metal pipe, and passing said metal pipe clad cable through a plurality of sets of bending rolls. The metal pipe is repeatedly bent when passing through the plural sets of said bending rolls so as to generate a plastic deformation within the metal pipe and, thus, to impart an excess length to the fiber within the metal pipe.Type: GrantFiled: February 23, 1993Date of Patent: June 7, 1994Assignees: Hitachi Cable Ltd., NKK CorporationInventors: Shigeo Toya, Tatsuo Teraoka, Yoshiyuki Hiramoto, Yasunori Yoshie
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Patent number: 5142763Abstract: Metal pipes containing optical fibers are connected to each other directly or indirectly by use of a sleeve. In case of using the sleeve, the sleeve is connected at one end to one of the metal pipes, after the optical fibers are connected. Then, the sleeve is elongated by a predetermined length, so that the sleeve is connected at the other end to the other metal pipe. Consequently, no tensile stress resides in the connected optical fibers in the connected structure. When the metal pipes are connected directly to each other, one or both of the metal pipes are elongated, after the optical fibers are connected. Then, the metal pipes are connected by use of the elongated portions. Consequently, the same result is obtained as using the sleeve.Type: GrantFiled: March 31, 1991Date of Patent: September 1, 1992Assignees: Hitachi Cable, Ltd., NKK CorporationInventors: Shigeo Toya, Yoshiyuki Hiramoto, Koji Sasaki, Koichi Abe, Tatsuo Teraoka, Hirokazu Shiga, Yasunori Yoshie
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Patent number: 5076657Abstract: Metal pipes containing optical fibers are connected to each other directly or indirectly by use of a sleeve. In case of using the sleeve, the sleeve is connected at one end to one of the metal pipes, after the optical fibers are connected. Then, the sleeve is elongated by a predetermined length, so that the sleeve is connected at the other end to the other metal pipe. Consequently, no tensile stress resides in the connected optical fibers in the connected structure. When the metal pipes are connected directly to each other, one or both of the metal pipes are elongated, after the optical fibers are connected. Then, the metal pipes are connected by used of the elongated portions. Consequently, the same result is obtained as using the sleeve.Type: GrantFiled: September 25, 1990Date of Patent: December 31, 1991Assignees: Hitachi Cable Ltd., NKK CorporationInventors: Shigeo Toya, Yoshiyuki Hiramoto, Koji Sasaki, Koichi Abe, Tatsuo Teraoka, Hirokazu Shiga, Yasunori Yoshie
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Patent number: 4859223Abstract: Two opposite portions of the surface of a core rod whose section is circular are removed by machining in the longitudinal direction thereof, so that the section of the core rod is transformed into a non-circular shape. On the surface of the thusly shaped non-circular core rod, glass particulates are accumulated, and then the glass particulates accumulated on the core rod are sintered to create a preform. Then, the preform is heated and drawn, so that a polarization-maintaining optical fiber of non-circular section is obtained.Type: GrantFiled: January 5, 1988Date of Patent: August 22, 1989Assignee: Hitachi Cable LimitedInventors: Hiroshi Kajioka, Koudo Yamada, Yuuetsu Takuma, Tatsuo Teraoka