Patents by Inventor Haruhiko Aikawa
Haruhiko Aikawa 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: 7143608Abstract: A concentric multi-tubular burner for synthesizing glass particles having a center port group constituted by a combination of jet ports of raw material gas, combustible gas and oxygen gas, wherein an outer wall of the oxygen gas jet port in the center port group protrudes more toward a burner head than an inner wall of the oxygen gas jet port. The flow rate of oxygen gas jetted from the oxygen gas jet port of the center port group is controlled to be in a proper range.Type: GrantFiled: March 4, 2004Date of Patent: December 5, 2006Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tadashi Enomoto, Yuichi Ohga, Nobuya Akaike, Haruhiko Aikawa, Takashi Matsuo, Motonori Nakamura
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Publication number: 20040168472Abstract: A concentric multi-tubular burner for synthesizing glass particles having a center port group constituted by a combination of jet ports of raw material gas, combustible gas and oxygen gas, wherein an outer wall of the oxygen gas jet port in the center port group protrudes more toward a burner head than an inner wall of the oxygen gas jet port. The flow rate of oxygen gas jetted from the oxygen gas jet port of the center port group is controlled to be in a proper range.Type: ApplicationFiled: March 4, 2004Publication date: September 2, 2004Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Tadashi Enomoto, Yuichi Ohga, Nobuya Akaike, Haruhiko Aikawa, Takashi Matsuo, Motonori Nakamura
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Patent number: 6725690Abstract: A concentric multi-tubular burner for synthesizing glass particles having a center port group constituted by a combination of jet ports of raw material gas, combustible gas and oxygen gas, wherein an outer wall of the oxygen gas jet port in the center port group protrudes more toward a burner head than an inner wall of the oxygen gas jet port. The flow rate of oxygen gas jetted from the oxygen gas jet port of the center port group is controlled to be in a proper range.Type: GrantFiled: September 14, 2001Date of Patent: April 27, 2004Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tadashi Enomoto, Yuichi Ohga, Nobuya Akaike, Haruhiko Aikawa, Takashi Matsuo, Motonori Nakamura
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Patent number: 6612134Abstract: The present invention relates to a method of making an optical fiber product. In particular, this manufacturing method is characterized in that, between a drawing step in which a coated optical fiber comprising a glass fiber and a primary coating layer disposed around the outer periphery of the glass fiber is wound around a reel and a processing step in which the coated optical fiber wound around the reel is rewound around a bobbin, a control step is provided for holding the coated optical fiber wound around the reel in a place with a mean atmospheric temperature T (>0° C.) for at least 30,000/T2 (hr) and, in the case where a coloring layer or the like is disposed around the outer periphery of the coated optical fiber, for at least 30,000/T2 (hr) but not longer than 210,000/T2 (hr).Type: GrantFiled: December 4, 1997Date of Patent: September 2, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventors: Koji Shimoda, Haruhiko Aikawa, Motohide Yoshida, Takashi Hasegawa
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Publication number: 20020116955Abstract: A method of forming a silica soot preform comprising: forming a primary soot preform on an outer periphery of a glass rod by a primary burner; and forming a secondary soot preform by a secondary burner on an outer periphery the primary soot preform, wherein a diameter of the primary soot preform is set to be ranged from twice to five times of a diameter of the glass rod, a thickness of the secondary soot preform is set to be range from 1.5 times to seven times of that of the primary soot preform. Consequently, the deposition rate with respect to the introduction of the raw material gas is considerably increased. Further, it is possible to maximize a performance of depositing the primary soot preform.Type: ApplicationFiled: February 19, 2002Publication date: August 29, 2002Applicant: Sumitomo Electric Industries, Ltd.Inventors: Tadashi Enomoto, Yuichi Ohga, Nobuya Akaike, Haruhiko Aikawa
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Publication number: 20020062659Abstract: A concentric multi-tubular burner for synthesizing glass particles having a center port group constituted by a combination of jet ports of raw material gas, combustible gas and oxygen gas, wherein an outer wall of the oxygen gas jet port in the center port group protrudes more toward a burner head than an inner wall of the oxygen gas jet port. The flow rate of oxygen gas jetted from the oxygen gas jet port of the center port group is controlled to be in a proper range.Type: ApplicationFiled: September 14, 2001Publication date: May 30, 2002Inventors: Tadashi Enomoto, Yuichi Ohga, Nobuya Akaike, Haruhiko Aikawa, Takashi Matsuo, Motonori Nakamura
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Patent number: 5660611Abstract: A method for producing an oxide glass thin film is provided, in which volatilization of additives in a porous film from which the thin film is formed is effectively suppressed, and which the oxide glass film has a desired arrangement of refractive index with a low optical loss. According to this method, glass fine particles mainly containing SiO.sub.2 with a first additive are deposited on a substrate to form a porous thin film. A gas containing a second additive is supplied to a first chamber and heated to a first predetermined temperature profile to provide a heated gas containing an oxide. After disposing the substrate in a second chamber communicated with the first chamber, the substrate is heated to make the deposited porous glass into transparent glass while controlling a temperature in the second chamber according to a second temperature profile.Type: GrantFiled: June 5, 1995Date of Patent: August 26, 1997Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shinji Ishikawa, Akira Urano, Haruhiko Aikawa, Chizai Hirose, Hiroo Kanamori, Masahide Saitoh
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Patent number: 5585137Abstract: An apparatus includes a first waveguide having a first surface having a first hole through which a fiber passes, and a second surface having a second hole through which an object passes and opposing the first surface, a magic tee connected to the first waveguide, and an adjustable short plunger connected to the magic tee.Type: GrantFiled: March 3, 1995Date of Patent: December 17, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Motonori Nakamura, Toshio Danzuka, Akira Inoue, Haruhiko Aikawa
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Patent number: 5556442Abstract: A process for forming film structure using Flame Hydrolysis Deposition (FHD) in which (1) glass soot is deposited on a substrate via FHD to form a first porous vitreous layer having a first bulk density, (2) a second porous vitreous layer having a second bulk density that is larger than the first bulk density is formed from a portion of the first porous vitreous layer, and (3) a third porous vitreous layer having a third bulk density is formed by depositing glass soot containing a refractive index increasing dopant on the second porous vitreous layer by FHD. The first, second and third porous vitreous layers are then heated to form an undercladding layer and a core layer, the undercladding layer being formed from the first and second porous vitreous layers and the core layer being formed from the third porous vitreous layer.Type: GrantFiled: June 23, 1994Date of Patent: September 17, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroo Kanamori, Akira Urano, Haruhiko Aikawa, Shinji Ishikawa, Chisai Hirose, Masahide Saito
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Patent number: 5551966Abstract: In the method for forming an optical waveguide according to this invention, an optical waveguide comprising a core of quartz as a main component, and a cladding layers surrounding the core is formed by deposition of glass fine particles by flame hydrolysis deposition and vitrifying the glass fine particle layers. This method includes a step of transiently increasing a feed amount of phosphorus to a flame burner in forming glass fine particle layers to be the cladding layers. Feeding phosphorus in this step for the first time after a glass fine particle layer is deposited without feeding phosphorus to the flame burner, whereby generation of foreign objects near the core dan be suppressed.Type: GrantFiled: January 13, 1994Date of Patent: September 3, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Chisai Hirose, Hiroo Kanamori, Akira Urano, Shinji Ishikawa, Haruhiko Aikawa, Masahide Saito
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Patent number: 5503650Abstract: A method of producing an oxide glass thin film includes a process to obtain a transparent glass film, in which volatilization of additives in a porous film deposited is effectively suppressed and which can provide an oxide glass thin film having a desired arrangement of refractive index with a low optical loss. The method is for producing an oxide glass thin film, in which glass fine particles mainly containing SiO.sub.2 with additives are deposited on a substrate to form a porous thin film and then heated to form a transparent glass film. In the method, vapor of oxides of additive components is mixed in an atmosphere in which the porous thin film is heated to form the transparent glass film, whereby stopping the volatilization of the additives in the porous film deposited, preventing diffusion of the additives added to a core layer, and preventing the volatilization of glass transition temperature lowering components of additives (P.sub.2 O.sub.5, B.sub.2 O.sub.3, GeO.sub.2, etc.).Type: GrantFiled: October 28, 1994Date of Patent: April 2, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shinji Ishikawa, Akira Urano, Haruhiko Aikawa, Chizai Hirose, Hiroo Kanamori, Masahide Saitoh
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Patent number: 5385594Abstract: In the first step, a fuel and raw material gases are fed to burner while flames from the burner scan a Si substrate. Synthesized fine glass particles are deposited on the substrate to form a first porous vitreous layer to be an under cladding layer. In the second step, the first porous vitreous layer is heated by the flames. A bulk density of an upper part of the first porous vitreous layer is raised to 0.3 g/cm.sup.3. Having a raised bulk density, this upper part functions as a shield layer against GeO.sub.2. In the third step, a second porous vitreous layer, to be a core layer, is deposited uniformly on the first porous vitreous layer. In the fourth step, the first and the second porous vitreous layers are sintered. In this case, the shield layer with a higher bulk density hinders the GeO.sub.2 component which has evaporated from the second porous vitreous layer from diffusing into the first porous vitreous layer.Type: GrantFiled: December 4, 1992Date of Patent: January 31, 1995Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroo Kanamori, Akira Urano, Haruhiko Aikawa, Shinji Ishikawa, Chisai Hirose, Masahide Saito
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Patent number: 5357334Abstract: A spectroanalyzer accurately spectroanalyzes in spite of the deterioration of transmissibility of an optical fiber (5) by radiation, by using a light from a sample cell (1) as a measurement light which passes through the optical fiber (5). The spectroanalyzer comprises a white light source (15) for directing a monitoring light to a one end (5b) of the optical fiber (5), and a half-mirror (3) arranged in front of the other end (5a) of the optical fiber (5) for reflecting the monitoring light, which is modulated to permit the discrimination thereof from the measurement light. Accordingly, a degree of deterioration of the optical fiber (5) can be determined from the monitoring light, and the affect of the deterioration of the transmissibility can be corrected by dividing a measurement light power by a monitoring light power so that the accurate measurement of the sample cell 1 is attained in spite of the deterioration of the transmissibility of the optical fiber (5).Type: GrantFiled: December 18, 1992Date of Patent: October 18, 1994Assignees: Sumitomo Electric Industries Ltd., Doryokuro Kakunenryo Kaihatsu JigyodanInventors: Yoichi Ishiguro, Haruhiko Aikawa, Minoru Watanabe, Yoshiaki Ichige, Fumitoshi Okamoto
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Patent number: 5352261Abstract: There is provided an apparatus for the production of a hermetically coated optical fiber in which a glass preform for an optical fiber is melt drawn in a melt drawing furnace to produce a bare optical fiber which is passed to a reactor where a feed gas is supplied and the bare optical fiber is coated with a thin carbon coating made from the feed gas by the Chemical Vapor Deposition method characterized in that the reactor comprises an upper portion to which the feed gas is supplied, a middle portion in which the CVD method is substantially carried out and a lower portion from which an exhausted gas is withdrawn, and a cross sectional area of the middle portion perpendicular to a longitudinal direction of the optical fiber is larger than that of the upper portion.Type: GrantFiled: May 25, 1993Date of Patent: October 4, 1994Assignee: Sumitomo Electric Industries, Ltd.Inventors: Haruhiko Aikawa, Katsuya Nagayama, Toshio Danzuka
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Patent number: 5348564Abstract: An apparatus for manufacturing a hermetically coated optical fiber having a single reaction chamber into which a fare fiber and raw gas are to be introduced for applying a hermetic coating to the bare fiber while the bare fiber passes through the reaction chamber is characterized by that the reaction chamber has a plurality of inlet tubes to introduce the raw gas, and the plurality of inlet tubes open to the reaction chamber at different positions from each other in a direction of movement of the bare fiber passing through said reaction chamber.Type: GrantFiled: February 14, 1992Date of Patent: September 20, 1994Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone CorporationInventors: Haruhiko Aikawa, Katsuya Nagayama, Yoichi Ishiguro, Ichiro Yoshimura, Yutaka Katsuyama, Nobuyuki Yoshizawa
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Patent number: 5338328Abstract: A mass production method and apparatus of hermetic coating optical fiber where a bare fiber drawn from a preform is hermetically coated by CVD method in a reactor vessel, wherein a liquid flushes solid particles or by-products sticking to the reactor inner wall. The liquid may be supplied continuously or intermittently, to flush carbon particles generated during carbon coating process. The invention enables to produce a long hermetic coating optical fiber without choking the reactor, and improves a yield rate and productivity.Type: GrantFiled: November 9, 1993Date of Patent: August 16, 1994Assignee: Sumitomo Electric Industries, Ltd.Inventors: Haruhiko Aikawa, Yoichi Ishiguro, Toshio Danzuka
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Patent number: 5296011Abstract: A mass production method of hermetic coating optical fiber where a bare fiber drawn from a preform is hermetically coated by CVD method in a reactor vessel, wherein a liquid flushes solid particles or by-products sticking to the reactor inner wall. The liquid may be supplied continuously or intermittently, to flush carbon particles generated during carbon coating process. The invention enables to produce a long hermetic coating optical fiber without choking the reactor, and improves a yield rate and productivity.Type: GrantFiled: June 12, 1992Date of Patent: March 22, 1994Assignee: Sumitomo Electric Industries, Ltd.Inventors: Haruhiko Aikawa, Yoichi Ishiguro, Toshio Danzuka
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Patent number: 5281247Abstract: A hermetic coated optical fiber is produced by preparing a bare optical fiber by melting and drawing an optical fiber preform in a fiber drawing furnace and introducing the bare optical fiber in a reactor in which a raw material gas is introduced and forming a hermetic coating film around a surface of the bare optical fiber by a chemical vapor deposition method or pyrolysis in the reactor, wherein a part of an inert gas for purging the fiber drawing furnace which has been heated by a heater equipped in the furnace is exhausted and a rest of the inert gas is introduced in the reactor for diluting the raw material gas.Type: GrantFiled: December 3, 1992Date of Patent: January 25, 1994Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone CorporationInventors: Haruhiko Aikawa, Yoichi Ishiguro, Katsuya Nagayama, Ichiro Yoshimura, Yutaka Katsuyama, Nobuyuki Yoshizawa
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Patent number: 5243677Abstract: A quartz optical waveguide comprising a substrate, a ridge-form core part formed on said substrate and a part which surrounds said core part and has a lower refractive index than that of said core part, wherein a refractive index changes continuously at an interface between said core part and said part having the lower refractive index, which has a decreased transmission loss and a connection loss when connected with an optical fiber.Type: GrantFiled: July 10, 1992Date of Patent: September 7, 1993Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroo Kanamori, Masumi Ito, Shinji Ishikawa, Haruhiko Aikawa, Sumio Hoshino
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Patent number: 5208645Abstract: A method and an apparatus for measuring the thickness of a coating provided around a cylindrical object such as an optical fiber optically. The cylindrical object is irradiated by a measuring light and the light derived from the object is received by a photo-detector so that the intensity of the derived light is measured to thereby detect the thickness of the coating.Type: GrantFiled: January 16, 1991Date of Patent: May 4, 1993Assignee: Sumitomo Electric Industries, Ltd.Inventors: Akira Inoue, Yoichi Ishiguro, Haruhiko Aikawa