Patents by Inventor Hiroshi Katsura
Hiroshi Katsura 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: 7512307Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.Type: GrantFiled: July 31, 2006Date of Patent: March 31, 2009Assignee: Sumitomo Electric Industries, Ltd.Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
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Patent number: 7410303Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.Type: GrantFiled: November 29, 2002Date of Patent: August 12, 2008Assignee: Sumitomo Electric Industries, Ltd.Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
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Publication number: 20060263034Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.Type: ApplicationFiled: July 31, 2006Publication date: November 23, 2006Applicant: Sumitomo Electric Industries, Ltd.Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
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Patent number: 7052187Abstract: A pair of guide holes for guide pin insertion and one or a plurality of optical fiber positioning holes extending inwardly from the front end surface are formed in a connector ferrule of an optical connector. A chamfer is formed on the opening edge portion of the guide hole of the connector ferrule on the front end surface side thereof. The opening diameter R of the guide hole at the front end surface is preferably 1.0 to 1.5 mm when the front end surface is slant polished at an angle of 8 degrees. Furthermore, the chamfering angle ? of the chamfer is preferably 90 to 150 degrees. Moreover, the average particle size of the filler contained in the connector ferrule is no more than 20 ?m. As a result, the surface of the chamfer is comparatively smooth.Type: GrantFiled: February 28, 2002Date of Patent: May 30, 2006Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Yoshikyo Tamekuni, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Patent number: 6964525Abstract: An optical connector according to the present invention has a ferrule body provided with a fiber positioning hole, a pair of guide holes into which guide pins are inserted, and a connecting end face in which ends of the fiber positioning hole and guide holes open. A chamfer portion equivalent to a part of a surface of a body of revolution is formed at each guide hole on the connecting end face side. Further, the connecting end face is formed at an angle relative to a plane normal to the center axes of the pair of guide holes. In this structure, the slope of the connecting end face can suppress degradation of connection loss, and the provision of the chamfer portions can facilitate insertion of the guide pins, prevent damage of the connecting end face due to the guide pins, and also suppress degradation of connection loss due to the damage.Type: GrantFiled: January 12, 2004Date of Patent: November 15, 2005Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Publication number: 20050123248Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.Type: ApplicationFiled: November 29, 2002Publication date: June 9, 2005Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTDInventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kaki, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
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Publication number: 20040151439Abstract: An optical connector according to the present invention has a ferrule body provided with a fiber positioning hole, a pair of guide holes into which guide pins are inserted, and a connecting end face in which ends of the fiber positioning hole and guide holes open. A chamfer portion equivalent to a part of a surface of a body of revolution is formed at each guide hole on the connecting end face side. Further, the connecting end face is formed at an angle relative to a plane normal to the center axes of the pair of guide holes. In this structure, the slope of the connecting end face can suppress degradation of connection loss, and the provision of the chamfer portions can facilitate insertion of the guide pins, prevent damage of the connecting end face due to the guide pins, and also suppress degradation of connection loss due to the damage.Type: ApplicationFiled: January 12, 2004Publication date: August 5, 2004Inventors: Kenichiro Ohtsuka, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Patent number: 6719927Abstract: An optical connector ferrule 1A is mounted on the distal end of a fiber optic ribbon cable 2 to form an optical connector Ca. A mating surface 11 of the optical connector Ca opposes an optical connector Cb to be mated. Fiber accommodating holes 13 are formed in the mating surface 11 so as to accommodate optical fibers, and a pair of guide projections 10 are formed on the mating surface 11 so as to be positioned with the optical connector Cb. The ferrule 1A is integrally molded with a resin. This provides an optical connector ferrule allowing the easy manufacturing of an optical connector with good transmission performance.Type: GrantFiled: January 30, 2001Date of Patent: April 13, 2004Assignee: Sumitomo Electric Industries, Ltd.Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Masahiro Shibata
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Patent number: 6676300Abstract: A ferrule for optical connector according to the present invention is provided with a fiber positioning hole, a pair of guide holes into which guide pins are inserted, and a connecting end face in which ends of the fiber positioning hole and guide holes open. A chamfer portion equivalent to a part of a surface of a body of revolution is formed at each guide hole on the connecting end face side. Further, the connecting end face is formed at an angle relative to a plane normal to the center axes of the pair of guide holes. In this structure, the slope of the connecting end face can suppress degradation of connection loss, and the provision of the chamfer portions can facilitate insertion of the guide pins, prevent damage of the connecting end face due to the guide pins, and also suppress degradation of connection loss due to the damage.Type: GrantFiled: February 28, 2002Date of Patent: January 13, 2004Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Patent number: 6616343Abstract: The optical fiber positioning member in accordance with the present invention comprises a resin composition containing a PPS resin mainly composed of a linear type PPS resin at a content in the range of 24% to 30% by weight, silica particles at a content in the range of 61% to 67% by weight, and tetrapod-shaped whiskers at a content in the range of 6% to 12% by weight.Type: GrantFiled: March 2, 2001Date of Patent: September 9, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroshi Katsura, Wataru Sakurai, Toshiaki Kakii
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Publication number: 20030161584Abstract: A pair of guide holes for guide pin insertion and one or a plurality of optical fiber positioning holes extending inwardly from the front end surface are formed in a connector ferrule of an optical connector. A chamfer is formed on the opening edge portion of the guide hole of the connector ferrule on the front end surface side thereof. The opening diameter R of the guide hole at the front end surface is preferably 1.0 to 1.5 mm when the front end surface is slant polished at an angle of 8 degrees. Furthermore, the chamfering angle &thgr; of the chamfer is preferably 90 to 150 degrees. Moreover, the average particle size of the filler contained in the connector ferrule is no more than 20 &mgr;m. As a result, the surface of the chamfer is comparatively smooth.Type: ApplicationFiled: February 28, 2002Publication date: August 28, 2003Inventors: Kenichiro Ohtsuka, Yoshikyo Tamekuni, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Patent number: 6478476Abstract: The present invention relates to an optical fiber positioning member, such as a ferrule, used for optically coupling optical fibers to each other. The object of the present invention is to provide an optical fiber positioning member having practically sufficient mechanical strength and long-term durability, while maintaining high dimensional precision and dimensional stability. The optical fiber positioning member of the present invention comprises a resin composition containing a polyphenylene sulfide resin at a ratio in the range of 15% to 35% by weight, silica particles at a ratio in the range of 45% to 65% by weight, and silicate whiskers at a ratio in the range of 26% to 35% by weight, the resin composition containing the silica particles and the silicate whiskers at a ratio in the range of 65% to 85% by weight.Type: GrantFiled: December 10, 1999Date of Patent: November 12, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroshi Katsura, Wataru Sakurai, Toshiaki Kakii, Masahiro Shibata
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Publication number: 20020154867Abstract: A ferrule for optical connector according to the present invention is provided with a fiber positioning hole, a pair of guide holes into which guide pins are inserted, and a connecting end face in which ends of the fiber positioning hole and guide holes open. A chamfer portion equivalent to a part of a surface of a body of revolution is formed at each guide hole on the connecting end face side. Further, the connecting end face is formed at an angle relative to a plane normal to the center axes of the pair of guide holes. In this structure, the slope of the connecting end face can suppress degradation of connection loss, and the provision of the chamfer portions can facilitate insertion of the guide pins, prevent damage of the connecting end face due to the guide pins, and also suppress degradation of connection loss due to the damage.Type: ApplicationFiled: February 28, 2002Publication date: October 24, 2002Inventors: Kenichiro Ohtsuka, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Publication number: 20020102068Abstract: A ferrule for optical connector according to the present invention is provided with a fiber positioning hole, a pair of guide holes into which guide pins are inserted, and a connecting end face in which ends of the fiber positioning hole and guide holes open. A chamfer portion equivalent to a part of a surface of a body of revolution is formed at each guide hole on the connecting end face side. Further, the connecting end face is formed at an angle relative to a plane normal to the center axes of the pair of guide holes. In this structure, the slope of the connecting end face can suppress degradation of connection loss, and the provision of the chamfer portions can facilitate insertion of the guide pins, prevent damage of the connecting end face due to the guide pins, and also suppress degradation of connection loss due to the damage.Type: ApplicationFiled: January 25, 2002Publication date: August 1, 2002Inventors: Kenichiro Ohtsuka, Hiroshi Katsura, Tomohiko Ueda, Toshiaki Kakii
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Patent number: 6340247Abstract: An optical connector ferrule 1A is mounted on the distal end of a fiber optic ribbon cable 2 to form an optical connector Ca. A mating surface 11 of the optical connector Ca opposes an optical connector Cb to be mated. Fiber accommodating holes 13 are formed in the mating surface 11 so as to accommodate optical fibers, and a pair of guide projections 10 are formed on the mating surface 11 so as to be positioned with the optical connector Cb. The ferrule 1A is integrally molded with a resin. This provides an optical connector ferrule allowing the easy manufacturing of an optical connector with good transmission performance.Type: GrantFiled: June 7, 2000Date of Patent: January 22, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Masahiro Shibata
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Publication number: 20010031116Abstract: The optical fiber positioning member in accordance with the present invention comprises a resin composition containing a PPS resin mainly composed of a linear type PPS resin at a content in the range of 24% to 30% by weight, silica particles at a content in the range of 61% to 67% by weight, and tetrapod-shaped whiskers at a content in the range of 6% to 12% by weight.Type: ApplicationFiled: March 2, 2001Publication date: October 18, 2001Applicant: sumitomo Electric Industries, Ltd.Inventors: Hiroshi Katsura, Wataru Sakurai, Toshiaki Kakii
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Patent number: 6287017Abstract: In an optical connector for positioning and fixing the distal end of a fiber optic ribbon cable with a connector ferrule, a guide-pin hole is formed in a mating end connected with another optical connector. A pair of positioning guide pins are inserted into the respective guide-pin holes. The guide-pin hole has an enlarged region whose diameter gradually increases toward the opening end portion of the mating end.Type: GrantFiled: April 19, 2000Date of Patent: September 11, 2001Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroshi Katsura, Wataru Sakurai, Toshiaki Kakii, Masahiro Shibata
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Publication number: 20010007603Abstract: An optical connector ferrule 1A is mounted on the distal end of a fiber optic ribbon cable 2 to form an optical connector Ca. A mating surface 11 of the optical connector Ca opposes an optical connector Cb to be mated. Fiber accommodating holes 13 are formed in the mating surface 11 so as to accommodate optical fibers, and a pair of guide projections 10 are formed on the mating surface 11 so as to be positioned with the optical connector Cb. The ferrule 1A is integrally molded with a resin. This provides an optical connector ferrule allowing the easy manufacturing of an optical connector with good transmission performance.Type: ApplicationFiled: January 30, 2001Publication date: July 12, 2001Applicant: Sumitomo Electric Industries, LtdInventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Masahiro Shibata
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Patent number: 6074577Abstract: An end-face-side core 5 from which an optical fiber hole forming pin 1 is projected is fastened by a mold to a fiber-side core 10 from which an optical fiber hole forming pin 6 and a cavity forming member (for example, a tape fiber hole forming rectangular body 8) are projected, while the end-face-side core and the fiber-side core are opposed to each other, the cavity forming member being behind the optical fiber hole forming pin 6 and larger than the optical fiber hole forming pin. A resin is injected into a cavity formed in the mold. The mold is opened, the end-face-side core 5 and the fiber-side core 10 are slid in directions in which the end-face-side core and the fiber-side core are separated from each other, and a resin molded product is then taken out.Type: GrantFiled: December 29, 1997Date of Patent: June 13, 2000Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hiroshi Katsura, Makoto Honjo, Toshiaki Kakii, Wataru Sakurai, Masahiro Shibata
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Patent number: 6062740Abstract: An optical connector in which an optical fiber is fixed within a ferrule such that a tip of the optical fiber is disposed at a front end face position of the ferrule. An optical-fiber-positioning hole formed so as to directly extend into the ferrule from an optical connecting orifice formed in the front end face of the ferrule has a diameter greater than a diameter of the optical fiber positioned within the optical-fiber-positioning hole, the optical-fiber-positioning hole having therein a compressible unfixing area for allowing the optical fiber to compress along the optical-fiber-positioning hole, and a fixing area, disposed behind the compressible unfixing area, for fixing the optical fiber to the ferrule.Type: GrantFiled: August 25, 1998Date of Patent: May 16, 2000Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Tomohiko Ueda, Toshiaki Kakii, Hiroshi Katsura