Patents by Inventor Tomohiko Ueda
Tomohiko Ueda 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).
-
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
-
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
-
Patent number: 7043127Abstract: An optical fiber suitable for use in a single fiber or multifiber optical connector or array is structured with a core region and a cladding region surrounding the core region, and exhibits a bending loss of a fundamental mode of the fiber at a wavelength ? is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field diameter of the fundamental mode at an end of the fiber at the wavelength ? is between 8.0 ?m and 50 ?, and a bending loss of a first higher-order mode at the wavelength ? is higher than 1 dB/m at a diameter of 30 mm. The fiber may be multistructured, wherein the cladding region comprises a main medium and a plurality of sub medium regions therein to form a spatially uniform average refractive index.Type: GrantFiled: March 15, 2005Date of Patent: May 9, 2006Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takemi Hasegawa, Eisuke Sasaoka, Daizo Nishioka, Tomohiko Ueda, Toshifumi Hosoya
-
Publication number: 20050281518Abstract: Tensile strength of a tape layer in the lengthwise direction is selected to be higher than adhesive force of the tape layer to optical fiber cores. Further, position limiting portions 111 by which the positions of a plurality of optical fibers 120 can be limited are formed in a flexible film 110 for tape core assembly which film is used for integrating the plurality of optical fibers 120 as a tape. Further, a ribbon-like optical fiber core assembly 301 according to the invention including a plurality of optical fiber cores 302 arranged planarly at designated intervals, an adhesive layer 305 disposed so as to surround the optical fiber cores 302, and films 304a and 304b integrated with the optical fiber cores 302 by the adhesive layer 305.Type: ApplicationFiled: August 27, 2003Publication date: December 22, 2005Inventors: Kousuke Tanaka, Toshifumi Hosoya, Tsuyoshi Ikada, Kazuhiro Sato, Hiroyasu Sugiyama, Toshiaki Kakii, Tomohiko Ueda
-
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
-
Publication number: 20050238308Abstract: An optical fiber suitable for use in a single fiber or multifiber optical connector or array is structured with a core region and a cladding region surrounding the core region, and exhibits a bending loss of a fundamental mode of the fiber at a wavelength ? is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field diameter of the fundamental mode at an end of the fiber at the wavelength ? is between 8.0 ?m and 50 ?, and a bending loss of a first higher-order mode at the wavelength ? is higher than 1 dB/m at a diameter of 30 mm. The fiber may be multistructured, wherein the cladding region comprises a main medium and a plurality of sub medium regions therein to form a spatially uniform average refractive index.Type: ApplicationFiled: March 15, 2005Publication date: October 27, 2005Applicant: Sumitomo Electric Industries, Ltd.Inventors: Takemi Hasegawa, Eisuke Sasaoka, Daizo Nishioka, Tomohiko Ueda, Toshifumi Hosoya
-
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
-
Patent number: 6901197Abstract: An optical fiber suitable for use in a single fiber or multifiber optical connector or array is structured with a core region and a cladding region surrounding the core region, and exhibits a bending loss of a fundamental mode of the fiber at a wavelength ? is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field diameter of the fundamental mode at an end of the fiber at the wavelength ? is between 8.0 ?m and 50 ?, and a bending loss of a first higher-order mode at the wavelength ? is higher than 1 dB/m at a diameter of 30 mm. The fiber may be multistructured, wherein the cladding region comprises a main medium and a plurality of sub medium regions therein to form a spatially uniform average refractive index.Type: GrantFiled: January 13, 2003Date of Patent: May 31, 2005Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takemi Hasegawa, Eisuke Sasaoka, Daizo Nishioka, Tomohiko Ueda, Toshifumi Hosoya
-
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
-
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
-
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
-
Patent number: 6565265Abstract: An optical connector comprising a ferrule including an optical fiber, wherein a hollow portion for optical fiber protrusion is formed on a front end face of the ferrule, the optical fiber is inserted into an optical fiber positioning hole extended from an optical fiber protrusion port provided on a bottom face of the hollow portion toward an inside of the ferrule, and a tip face of the optical fiber is drawn in the hollow portion. This makes it possible to provide an optical connector which can shorten a time for assembly and can be assembled easily and inexpensively.Type: GrantFiled: March 5, 2001Date of Patent: May 20, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Takahisa Yamaguchi, Tomohiko Ueda, Toshiaki Kakii
-
Patent number: 6530696Abstract: An optical connector includes a ferrule and a pair of guide pins. Fiber insertion holes and a pair of pin insertion holes are formed in the ferrule. Each of the pair of guide pins has a total length larger than that of each pin insertion hole. The guide pins are coupled to each other on one end portion thereof. The other ends of the guide pins can be accommodated in the pin insertion holes by sliding the guide pins. An optical connecting surface of the ferrule is located at the extreme tip portion when viewed from the optical axis direction of an optical fiber while the other ends of the pair of guide pins are accommodated in the pin insertion holes. This makes it possible to bring the optical connecting surface of the ferrule into contact with an opposite-side optical component while the other ends of the guide pins are accommodated in the pin insertion holes and prohibited from protruding from the optical connecting surface.Type: GrantFiled: August 4, 2000Date of Patent: March 11, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tomohiko Ueda, Toshiaki Kakii
-
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
-
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
-
Patent number: 6409394Abstract: In an optical connector for securing an optical fiber by inserting it into an optical fiber positioning hole of a connector ferrule body, an end face of the optical fiber is disposed within the optical fiber positioning hole, a predetermined length region of the optical fiber on the end face side is in a free state adapted to expand and contract, and the end face of the optical fiber is buried in a refractive index matching material filling near an opening portion of the optical fiber positioning hole.Type: GrantFiled: March 21, 2000Date of Patent: June 25, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tomohiko Ueda, Kenichiro Ohtsuka, Toshiaki Kakii
-
Patent number: 6377743Abstract: An optical fiber holder 1B is an optical fiber holder for holding a plurality of optical fibers in line, and includes a base member 20 with a plurality of parallel positioning grooves 90 for positioning and aligning the plurality of optical fibers, and a lid member 32 adapted to cover the plurality of positioning grooves 90 and to fix the plurality of optical fibers, arranged in the positioning grooves 90, by pressing against the bottom portions of the positioning grooves 90. The lid member 32 has small projections 102 on its portion which comes into contact with the optical fibers.Type: GrantFiled: October 11, 2000Date of Patent: April 23, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tomohiko Ueda, Kenichiro Ohtsuka, Toshiaki Kakii
-
Patent number: 6331081Abstract: An optical transmission component and a method of making the same in which one or a plurality of optical fibers 1 are fixed to a main body 3 of the optical transmission component with one end face of each optical fiber being exposed, and thus exposed end face is used as a connecting end face to be optically connected to another optical transmission component. The coating 1b of each optical fiber 1 is removed, so as to expose a predetermined length of an optical fiber 1a. An end face 1c of thus exposed optical fiber is processed by spark discharge processing in a short period of time, such that at least the front end of a core portion projects from the front end of its cladding portion. Thus processed optical fiber 1 is inserted into the main body and fixed thereto with an adhesive 5, while a predetermined pressure is being added along the optical axis of each optical fiber 1 from the end face 1c side.Type: GrantFiled: September 13, 1999Date of Patent: December 18, 2001Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Tomohiko Ueda, Toshiaki Kakii
-
Publication number: 20010036341Abstract: An optical connector comprising a ferrule including an optical fiber, wherein a hollow portion for optical fiber protrusion is formed on a front end face of the ferrule, the optical fiber is inserted into an optical fiber positioning hole extended from an optical fiber protrusion port provided on a bottom face of the hollow portion toward an inside of the ferrule, and a tip face of the optical fiber is drawn in the hollow portion. This makes it possible to provide an optical connector which can shorten a time for assembly and can be assembled easily and inexpensively.Type: ApplicationFiled: March 5, 2001Publication date: November 1, 2001Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Kenichiro Ohtsuka, Takahisa Yamaguchi, Tomohiko Ueda, Toshiaki Kakii
-
Patent number: 6293708Abstract: An optical connector includes a first ferrule which holds the ends of a first optical fiber unit including at least one optical fiber, and a housing. The housing is a U-shaped member with parallel arms extending in the lengthwise direction of the first optical fiber unit. The housing surrounds one of the widthwise sides of the first ferrule from which the first optical fiber unit is derived and the lengthwise sides of the first ferrule, whereby the housing accommodates the first ferrule. The housing receives a second ferrule which holds the ends of a second optical fiber unit including at least one optical fiber through the U-shaped opening. The housing surrounds the lengthwise side of the second ferrule and a part of the side of the second ferrule from which the second optical fiber unit is derived, whereby the first and second ferrules are coupled together.Type: GrantFiled: February 29, 2000Date of Patent: September 25, 2001Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Ohtsuka, Tomohiko Ueda, Toshiaki Kakii