Patents by Inventor Hiroshi Kohda
Hiroshi Kohda 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: 20240053567Abstract: A method for manufacturing a colored optical fiber includes: a step of feeding colored resin into a die; a step of causing a coated optical fiber to pass through the inside of the die and applying the colored resin to a periphery of the coated optical fiber to form a colored optical fiber including a colored layer; a step of detecting a color of the colored layer; and a step of determining whether the detected color is good or bad.Type: ApplicationFiled: November 29, 2021Publication date: February 15, 2024Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Hiroshi KOHDA
-
Publication number: 20230416140Abstract: A method of manufacturing an optical fiber with a hole from a preform having a through hole is disclosed. The manufacturing method includes placing a preform in a drawing furnace, forming an optical fiber by melting and drawing the preform in the drawing furnace while a gas is introduced into the through hole, capturing an image of the optical fiber drawn from the preform, and measuring a hole diameter of the optical fiber based on an image captured in the capturing of the image and controlling a pressure of the gas introduced into the through hole based on a measurement result. In the capturing of the image, when the optical fiber deviates, a predetermined countermeasure is taken to make the image clear, and the image is maintained in a clear state.Type: ApplicationFiled: June 21, 2023Publication date: December 28, 2023Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi KOHDA, Takaharu SATO, Katsuyuki TSUNEISHI
-
Publication number: 20230406751Abstract: Provided is an optical fiber manufacturing method where an optical fiber preform is drawn while being heated in a drawing furnace to form an optical fiber, the method including acquiring a captured image obtained by simultaneously photographing the optical fiber preform and an opening of the drawing furnace before drawing the optical fiber preform, and adjusting a position of the optical fiber preform so that a center of the optical fiber preform and a center of the opening match based on the captured image.Type: ApplicationFiled: November 12, 2021Publication date: December 21, 2023Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi KOHDA, Shinobu HATA, Satoshi YOSHIKAWA, Iwao OKAZAKI
-
Patent number: 11454760Abstract: A method for manufacturing an optical fiber, the method including: a stripping step of partially stripping a coating layer of the optical fiber; a splicing step of fusion-splicing an exposed end surface of a glass fiber; and a recoating step of recoating a protective resin covering a stripped portion of the coating layer and an exposed portion of the glass fiber, in which the stripping step is a step of irradiating the coating layer with a laser light to strip the coating layer.Type: GrantFiled: January 24, 2019Date of Patent: September 27, 2022Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Suguru Takasaki, Hiroshi Kohda
-
Patent number: 11256027Abstract: Provided is a glass eccentricity measurement device which includes an irradiation unit that irradiates a side surface of a coated glass fiber obtained by coating the striated glass with light, and a light receiving unit that receives light scattered and/or refracted following irradiation of the side surface of the coated glass fiber therewith, and measures an eccentricity of the glass in the coated glass fiber by a pattern of brightness and darkness in the light received by the light receiving unit, in which three or more sets including the irradiation unit and a screen are provided around the coated glass fiber, and the sets are arranged respectively in directions having different angles on a circumference centered on the coated glass fiber.Type: GrantFiled: November 1, 2018Date of Patent: February 22, 2022Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Hiroshi Kohda
-
Patent number: 11022549Abstract: An optical fiber inspecting device is disclosed. The optical fiber inspecting device includes a first light-emitting unit that irradiates an optical fiber with a first light beam, the optical fiber including a glass fiber and a coating resin and moving in an axial direction, and a first light-receiving unit that receives scattered light resulting from the first light beam scattered in the optical fiber, and converts the scattered light to an electrical signal. An optical axis of the first light-receiving unit passes through an irradiation position where the first light beam strikes the optical fiber, and the first light beam and the optical axis of the first light-receiving unit diagonally intersect each other, thereby preventing the first light beam from directly entering the first light-receiving unit.Type: GrantFiled: December 23, 2019Date of Patent: June 1, 2021Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi Kohda, Kumiko Tachibana, Takashi Fujii
-
Publication number: 20210096299Abstract: A method for manufacturing an optical fiber, the method including: a stripping step of partially stripping a coating layer 12, 13 of the optical fiber 10; a splicing step of fusion-splicing an exposed end surface of a glass fiber 11; and a recoating step of recoating a protective resin 15 covering a stripped portion of the coating layer 12, 13 and an exposed portion of the glass fiber 11, in which the stripping step irradiates the coating layer 12, 13 with a laser light to strip the coating layer 12, 13. A pulse width of the laser light is 50 fs or more and 500 ps or less.Type: ApplicationFiled: February 21, 2019Publication date: April 1, 2021Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi KOHDA, Suguru TAKASAKI
-
Publication number: 20210041630Abstract: A method for manufacturing an optical fiber, the method including: a stripping step of partially stripping a coating layer of the optical fiber; a splicing step of fusion-splicing an exposed end surface of a glass fiber; and a recoating step of recoating a protective resin covering a stripped portion of the coating layer and an exposed portion of the glass fiber, in which the stripping step is a step of irradiating the coating layer with a laser light to strip the coating layer.Type: ApplicationFiled: January 24, 2019Publication date: February 11, 2021Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Suguru TAKASAKI, Hiroshi KOHDA
-
Publication number: 20200257043Abstract: Provided is a glass eccentricity measurement device which includes an irradiation unit that irradiates a side surface of a coated glass fiber obtained by coating the striated glass with light, and a light receiving unit that receives light scattered and/or refracted following irradiation of the side surface of the coated glass fiber therewith, and measures an eccentricity of the glass in the coated glass fiber by a pattern of brightness and darkness in the light received by the light receiving unit, in which three or more sets including the irradiation unit and a screen are provided around the coated glass fiber, and the sets are arranged respectively in directions having different angles on a circumference centered on the coated glass fiber.Type: ApplicationFiled: November 1, 2018Publication date: August 13, 2020Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Hiroshi KOHDA
-
Publication number: 20200132598Abstract: An optical fiber inspecting device is disclosed. The optical fiber inspecting device includes a first light-emitting unit that irradiates an optical fiber with a first light beam, the optical fiber including a glass fiber and a coating resin and moving in an axial direction, and a first light-receiving unit that receives scattered light resulting from the first light beam scattered in the optical fiber, and converts the scattered light to an electrical signal. An optical axis of the first light-receiving unit passes through an irradiation position where the first light beam strikes the optical fiber, and the first light beam and the optical axis of the first light-receiving unit diagonally intersect each other, thereby preventing the first light beam from directly entering the first light-receiving unit.Type: ApplicationFiled: December 23, 2019Publication date: April 30, 2020Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi KOHDA, Kumiko TACHIBANA, Takashi FUJII
-
Patent number: 10551307Abstract: An optical fiber inspecting device is disclosed. The optical fiber inspecting device includes a first light-emitting unit that irradiates an optical fiber with a first light beam, the optical fiber including a glass fiber and a coating resin and moving in an axial direction, and a first light-receiving unit that receives scattered light resulting from the first light beam scattered in the optical fiber, and converts the scattered light to an electrical signal. An optical axis of the first light-receiving unit passes through an irradiation position where the first light beam strikes the optical fiber, and the first light beam and the optical axis of the first light-receiving unit diagonally intersect each other, thereby preventing the first light beam from directly entering the first light-receiving unit.Type: GrantFiled: March 24, 2017Date of Patent: February 4, 2020Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi Kohda, Kumiko Tachibana, Takashi Fujii
-
Publication number: 20190049372Abstract: An optical fiber inspecting device is disclosed. The optical fiber inspecting device includes a first light-emitting unit that irradiates an optical fiber with a first light beam, the optical fiber including a glass fiber and a coating resin and moving in an axial direction, and a first light-receiving unit that receives scattered light resulting from the first light beam scattered in the optical fiber, and converts the scattered light to an electrical signal. An optical axis of the first light-receiving unit passes through an irradiation position where the first light beam strikes the optical fiber, and the first light beam and the optical axis of the first light-receiving unit diagonally intersect each other, thereby preventing the first light beam from directly entering the first light-receiving unit.Type: ApplicationFiled: March 24, 2017Publication date: February 14, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroshi KOHDA, Kumiko TACHIBANA, Takashi FUJII
-
Patent number: 9291784Abstract: The sealing component 1 of the invention is provided with a metallic housing 19 that comprises a base part 19a, a side wall 19b connected to the base part 19a and an opening portion 19c facing to the base part 19a, and a metallic lid 20 to cover the opening portion 19c, wherein a melted portion 24 is formed around the boundary between the lid 20 and the upper edge 19b1, the melted portion 24 is formed to reach the corner 19b3 of the side wall 19b, and the melted portion 24 has a convexly-curved outward form 24a from the top face of the lid 20 to the corner 19b3 in the longitudinal cross-sectional view of the sealing component 1.Type: GrantFiled: March 5, 2014Date of Patent: March 22, 2016Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tomomi Moriya, Hiroshi Kohda, Dai Sasaki
-
Patent number: 9225138Abstract: The present invention relates to a laser light source capable of suppressing variation in propagation state of randomly-polarized laser light. In the laser light source, an isolator including a Faraday rotation crystal having a positive thermooptic constant, and a nonlinear optical crystal having a negative thermooptic constant are arranged in order along a traveling direction of laser light. The nonlinear optical crystal is arranged in a state off normal incidence of incident light so that a propagation axis of light propagating in the crystal is parallel to an optic axis of the crystal.Type: GrantFiled: August 23, 2013Date of Patent: December 29, 2015Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shigehiro Nagano, Motoki Kakui, Hiroshi Kohda, Shinobu Tamaoki, Yasuomi Kaneuchi
-
Publication number: 20150229094Abstract: The present invention relates to a laser light source capable of suppressing variation in propagation state of randomly-polarized laser light. In the laser light source, an isolator including a Faraday rotation crystal having a positive thermooptic constant, and a nonlinear optical crystal having a negative thermooptic constant are arranged in order along a traveling direction of laser light. The nonlinear optical crystal is arranged in a state off normal incidence of incident light so that a propagation axis of light propagating in the crystal is parallel to an optic axis of the crystal.Type: ApplicationFiled: August 23, 2013Publication date: August 13, 2015Inventors: Shigehiro Nagano, Motoki Kakui, Hiroshi Kohda, Shinobu Tamaoki, Yasuomi Kaneuchi
-
Patent number: 8933367Abstract: There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.Type: GrantFiled: February 8, 2012Date of Patent: January 13, 2015Assignees: Sumitomo Electric Industries, Ltd., National University Corporation Okayama UniversityInventors: Motoki Kakui, Hiroshi Kohda, Yasuomi Kaneuchi, Shinobu Tamaoki, Shigehiro Nagano, Yoshiyuki Uno, Yasuhiro Okamoto, Kenta Takahashi
-
Publication number: 20140254983Abstract: The sealing component 1 of the invention is provided with a metallic housing 19 that comprises a base part 19a, a side wall 19b connected to the base part 19a and an opening portion 19c facing to the base part 19a, and a metallic lid 20 to cover the opening portion 19c, wherein a melted portion 24 is formed around the boundary between the lid 20 and the upper edge 19b1, the melted portion 24 is formed to reach the corner 19b3 of the side wall 19b, and the melted portion 24 has a convexly-curved outward form 24a from the top face of the lid 20 to the corner 19b3 in the longitudinal cross-sectional view of the sealing component 1.Type: ApplicationFiled: March 5, 2014Publication date: September 11, 2014Applicant: Sumitomo Electric Industries, Ltd.Inventors: Tomomi MORIYA, Hiroshi KOHDA, Dai SASAKI
-
Patent number: D799429Type: GrantFiled: September 25, 2015Date of Patent: October 10, 2017Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya Nakanishi, Yuuichi Mitose, Hiroshi Kohda, Jun Ito, Takeyuki Ishii, Takashi Sasaki
-
Patent number: D799430Type: GrantFiled: September 25, 2015Date of Patent: October 10, 2017Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya Nakanishi, Yuuichi Mitose, Hiroshi Kohda, Takashi Sasaki, Takeyuki Ishii, Jun Ito
-
Patent number: D821330Type: GrantFiled: August 25, 2017Date of Patent: June 26, 2018Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuya Nakanishi, Yuuichi Mitose, Hiroshi Kohda, Takashi Sasaki, Jun Ito, Takeyuki Ishii