Patents by Inventor Kazunori Katayama
Kazunori Katayama 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: 20240134127Abstract: An object of the present disclosure is to provide a simple, compact optical switch with low power consumption.Type: ApplicationFiled: February 3, 2021Publication date: April 25, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Chisato FUKAI, Kunihiro TOGE, Yoshiteru ABE, Kazunori KATAYAMA
-
Patent number: 11949220Abstract: In a block (10) for a cable of the present disclosure, the block has a shape of a rectangular cuboid in which an upper surface (11) and a bottom surface have square shapes, the block has plural bending through holes (21) between one side surface of the rectangular cuboid and a side surface (12) neighboring the one side surface, arrangement of open ends (22) of the plural through holes in the one side surface of the rectangular cuboid is in a lattice manner, the arrangement of the open ends is in line symmetry with respect to a middle line (31) between an upper side and a bottom side of the one side surface and with respect to a middle line (32) between a lateral side and a lateral side of the one side surface, and arrangement of open ends (22) of the plural through holes in the side surface neighboring the one side surface of the rectangular cuboid is the same as the arrangement of the open ends (22) of the plural through holes in the one side surface of the rectangular cuboid.Type: GrantFiled: September 2, 2019Date of Patent: April 2, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kuniaki Terakawa, Tomohiro Kawano, Tatsuya Fujimoto, Kazunori Katayama, Tomomi Nagao
-
Publication number: 20240094477Abstract: An objective of the present disclosure is to provide an optical coupler and an optical switch capable of achieving stable optical characteristics with low power consumption and more economical efficiency with respect to external factors.Type: ApplicationFiled: January 27, 2021Publication date: March 21, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Chisato FUKAI, Yoshiteru ABE, Kunihiro TOGE, Kazunori KATAYAMA
-
Publication number: 20240061188Abstract: An object of the present disclosure is to enable a plurality of single-core fibers to be easily and collectively connected. The present disclosure relates to a cylindrical multi-core ferrule having a cylindrical shape and having through holes formed therein for holding a plurality of optical fibers on the same circle centered on a central axis of the cylindrical shape and an optical connector in which the cylindrical multi-core ferrule are disposed opposite to each other and a gap is formed between end surfaces of an optical fiber held by the cylindrical multi-core ferrule.Type: ApplicationFiled: January 20, 2021Publication date: February 22, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Chisato FUKAI, Yoshiteru ABE, Kunihiro TOGE, Kazunori KATAYAMA
-
Publication number: 20240056708Abstract: The disclosure provides a monitoring control device and an optical power supply system in which a system capable of remotely controlling many optical power supply type optical nodes can be economically constructed. A monitoring control device according to the present disclosure includes control means for executing power supply and power supply time allocation for selecting a control target optical node based on the amount of stored energy of a plurality of optical nodes. According to the present disclosure, in a system that includes a monitoring control device installed in a power supply environment and one or a plurality of remotely arranged optical line switching nodes, optical power supply and control of a plurality of optical switches included in the nodes and management of an amount of stored power can be simultaneously implemented with a single laser. Thus, it is possible to provide an economical optical line switching node system.Type: ApplicationFiled: December 16, 2020Publication date: February 15, 2024Inventors: Tomohiro KAWANO, Kunihiro TOGE, Chisato FUKAI, Kazunori KATAYAMA
-
Publication number: 20240027692Abstract: An object is to provide an optical connector cleaning tool capable of simultaneously and appropriately cleaning an end surface and a side surface of a ferrule of an optical connector plug. The optical connector cleaning tool according to the present invention includes an end surface cleaning section including a cleaning sheet for cleaning a ferrule end surface of an optical connector plug, a side surface cleaning section including a cleaning thread bundle (or cleaning sheet) for cleaning a ferrule side surface of the optical connector plug, and a mechanism that reveals a new cleaning sheet and a new cleaning thread bundle (or cleaning sheet) at a predetermined position after each cleaning operation.Type: ApplicationFiled: January 10, 2020Publication date: January 25, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Chisato FUKAI, Kazunori KATAYAMA, Masaaki TAKAYA, Yoshiteru ABE, Ryo KOYAMA
-
Publication number: 20230314715Abstract: An object of the present disclosure is to provide an optical coupling device capable of controlling a coupling rate of optical coupling between two coupling optical fibers. An optical coupling device of the present disclosure includes two coupling optical fibers each including a core and a clad and, between the two coupling optical fibers, a thickness variable member having a thickness between the two coupling optical fibers that varies by irradiation with light.Type: ApplicationFiled: August 7, 2020Publication date: October 5, 2023Inventors: Tatsuya Fujimoto, Hidenobu HIROTA, Takui UEMATSU, Tomohiro Kawano, Hiroyuki IIDA, Ryo Koyama, Tetsuya MANABE, Kazunori Katayama
-
Publication number: 20230280536Abstract: An object of the present disclosure is to provide an optical coupling device capable of controlling a coupling index of optical coupling between two optical fibers for coupling. An optical coupling device of the present disclosure includes two optical fibers for coupling having a core and a clad, and a refractive index variable member to change the refractive index by irradiation with light between the two optical fibers for coupling.Type: ApplicationFiled: July 21, 2020Publication date: September 7, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tatsuya FUJIMOTO, Hidenobu HIROTA, Takui UEMATSU, Tomohiro KAWANO, Hiroyuki IIDA, Ryo KOYAMA, Tetsuya MANABE, Kazunori KATAYAMA
-
Patent number: 11740414Abstract: An object is to provide a multifiber optical connector and an optical cable connection method capable of reducing a connection time and reducing an installation space of a connection portion. The multifiber optical connector according to the present invention includes three position adjustment units, and performs rough alignment to fine alignment of optical fiber end faces by using sequentially these position adjustment units when optical cables are connected. The multifiber optical connector simultaneously connects the end faces of the plurality of optical fibers included in the optical cables, and thus, an extra optical fiber tape is not present, and a closure needed in the related art is not necessary.Type: GrantFiled: October 9, 2019Date of Patent: August 29, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki Takaya, Kazunori Katayama, Yoshiteru Abe, Ryo Koyama, Chisato Fukai, Yusuke Yamada
-
Patent number: 11543612Abstract: To provide a connector plug that makes it possible to facilitate a plurality of persons' confirmation of a connector plug before its removal or after its insertion and to prevent erroneous work. The connector plug according to the present invention has a discoloration member mounted on a gripping portion for pinching during work. The color of the discoloration member changes due to heat of a worker's fingertips when the worker pinches the connector plug or pressure when the worker pinches the connector plug. The discoloration member is discolored by one worker pinching the connector plug. Another worker looks at the discolored discoloration member, and then is able to confirm whether the connector plug is a work target.Type: GrantFiled: October 9, 2019Date of Patent: January 3, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki Takaya, Yoshiteru Abe, Ryo Koyama, Chisato Fukai, Kazunori Katayama
-
Publication number: 20220349609Abstract: An air conditioning system of the present disclosure includes: sensors disposed on a plurality of openings connecting an underfloor space of a double floor and an upper side of the double floor; a wing that is disposed in the underfloor space under the opening and is configured to divert an air flow direction in the underfloor space by changing a slant angle of the wing; and a control device that is configured to acquire ideal values set in a plurality of the sensors, acquire actual measurement values from the plurality of sensors, calculate an average error from a difference between each of the ideal values and each of the actual measurement values, and change the slant angle of the wing to reduce the average error.Type: ApplicationFiled: September 25, 2019Publication date: November 3, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tatsuya FUJIMOTO, Tomohiro KAWANO, Kuniaki TERAKAWA, Kazunori KATAYAMA
-
Patent number: 11474303Abstract: An object is to provide an optical fiber connector ferrule, a sleeve, and a method for manufacturing a ferrule member that can avoid an increase in manufacturing time and an increase in cost of optical connectors for connecting multicore optical fibers. The present invention provides an optical fiber connector ferrule, a sleeve, and a method for manufacturing ferrule member which realizes alignment of multicore optical fibers corresponding to the connection by mounting a ferrule on a multicore fiber and then cutting a ferrule member instead of aligning core positions by rotating an axis of an optical fiber and adjusting positions of cores to the ferrule, leading to simplification of a rotational alignment step.Type: GrantFiled: September 11, 2019Date of Patent: October 18, 2022Assignee: Nippon Telegraph and Telephone CorporationInventors: Masaaki Takaya, Yoshiteru Abe, Ryo Koyama, Chisato Fukai, Kazunori Katayama, Kazuhide Nakajima, Yusuke Yamada
-
Publication number: 20220327274Abstract: A cable route setting method according to the present disclosure includes: defining unit areas in a floor where a cable is to be wired; and specifying a cable route of the cable passing through each of the unit areas to any of a route between a left side and a right side, a route between the left side and an upper side, a route between the upper side and the right side, a route between the left side and a lower side, a route between the lower side and the right side, a route between the upper side and the lower side, a route between the left side and a center, a route between the right side and the center, a route between the upper side and the center, and a route between the lower side and the center.Type: ApplicationFiled: September 4, 2019Publication date: October 13, 2022Inventors: Tatsuya Fujimoto, Tomohiro Kawano, Kuniaki Terakawa, Kazunori Katayama
-
Publication number: 20220318448Abstract: An object of the present invention is to provide a cable route design method that makes it possible to select a route for routing a communication cable in consideration of an influence of an air-conditioning airflow under a double floor. According to the present cable route design method, cables are routed such that an air-conditioning space under a double floor becomes as uniform as possible, a floor is modeled in a mesh structure, and one of cable routing patterns is applied to each of meshes and an air-conditioning airflow is calculated by a finite volume method, thereby indexing (an evaluation value) an air-conditioning efficiency. This enables comparison between a plurality of cable routing ideas, making it possible to find an optimal routing route.Type: ApplicationFiled: September 3, 2019Publication date: October 6, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kuniaki TERAKAWA, Tomohiro KAWANO, Tatsuya FUJIMOTO, Kazunori KATAYAMA, Tomomi NAGAO
-
Publication number: 20220320846Abstract: In a block (10) for a cable of the present disclosure, the block has a shape of a rectangular cuboid in which an upper surface (11) and a bottom surface have square shapes, the block has plural bending through holes (21) between one side surface of the rectangular cuboid and a side surface (12) neighboring the one side surface, arrangement of open ends (22) of the plural through holes in the one side surface of the rectangular cuboid is in a lattice manner, the arrangement of the open ends is in line symmetry with respect to a middle line (31) between an upper side and a bottom side of the one side surface and with respect to a middle line (32) between a lateral side and a lateral side of the one side surface, and arrangement of open ends (22) of the plural through holes in the side surface neighboring the one side surface of the rectangular cuboid is the same as the arrangement of the open ends (22) of the plural through holes in the one side surface of the rectangular cuboid.Type: ApplicationFiled: September 2, 2019Publication date: October 6, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kuniaki TERAKAWA, Tomohiro KAWANO, Tatsuya FUJIMOTO, Kazunori KATAYAMA, Tomomi NAGAO
-
Patent number: 11422301Abstract: An optical fiber cable 100 includes at least one optical fiber core 140 and a sheath containing the optical fiber core. The optical fiber core 140 includes optical fibers 130. A total length of the optical fiber core 140 is longer than that of the sheath 160. The optical fiber core 140 is contained in the sheath 160 so that bending occurs in the optical fibers 130.Type: GrantFiled: June 20, 2019Date of Patent: August 23, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yusuke Yamada, Masashi Kikuchi, Hisashi Izumita, Junichi Kawataka, Kazunori Katayama
-
Patent number: 11360281Abstract: An intermittent tape core wire (140) of an optical fiber cable is assembled into a cable core so that in a k core wire, an l core wire, and an m core wire composed of a multi-core optical fibers continuously adjacent in the width direction of the intermittent tape core wire (140), a difference ? between a core wire twisting direction D2km of the k core wire at a bonding portion (142) connecting the k core wire and the l core wire and a core wire twisting direction D2kl of the k core wire at a bonding portion (142) connecting the k core wire and the m core wire is different from when manufactured.Type: GrantFiled: July 2, 2019Date of Patent: June 14, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masashi Kikuchi, Yusuke Yamada, Hisashi Izumita, Junichi Kawataka, Kazunori Katayama
-
Publication number: 20220113484Abstract: To provide a connector plug that makes it possible to facilitate a plurality of persons' confirmation of a connector plug before its removal or after its insertion and to prevent erroneous work. The connector plug according to the present invention has a discoloration member mounted on a gripping portion for pinching during work. The color of the discoloration member changes due to heat of a worker's fingertips when the worker pinches the connector plug or pressure when the worker pinches the connector plug. The discoloration member is discolored by one worker pinching the connector plug. Another worker looks at the discolored discoloration member, and then is able to confirm whether the connector plug is a work target.Type: ApplicationFiled: October 9, 2019Publication date: April 14, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki TAKAYA, Yoshiteru ABE, Ryo KOYAMA, Chisato FUKAI, Kazunori KATAYAMA
-
Publication number: 20210389528Abstract: An object is to provide an optical fiber connector ferrule, a sleeve, and a method for manufacturing a ferrule member that can avoid an increase in manufacturing time and an increase in cost of optical connectors for connecting multicore optical fibers. The present invention provides an optical fiber connector ferrule, a sleeve, and a method for manufacturing ferrule member which realizes alignment of multicore optical fibers corresponding to the connection by mounting a ferrule on a multicore fiber and then cutting a ferrule member instead of aligning core positions by rotating an axis of an optical fiber and adjusting positions of cores to the ferrule, leading to simplification of a rotational alignment step.Type: ApplicationFiled: September 11, 2019Publication date: December 16, 2021Inventors: Masaaki Takaya, Yoshiteru Abe, Ryo Koyama, Chisato Fukai, Kazunori Katayama, Kazuhide Nakajima, Yusuke Yamada
-
Publication number: 20210341687Abstract: An object is to provide a multifiber optical connector and an optical cable connection method capable of reducing a connection time and reducing an installation space of a connection portion. The multifiber optical connector according to the present invention includes three position adjustment units, and performs rough alignment to fine alignment of optical fiber end faces by using sequentially these position adjustment units when optical cables are connected. The multifiber optical connector simultaneously connects the end faces of the plurality of optical fibers included in the optical cables, and thus, an extra optical fiber tape is not present, and a closure needed in the related art is not necessary.Type: ApplicationFiled: October 9, 2019Publication date: November 4, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki TAKAYA, Kazunori KATAYAMA, Yoshiteru ABE, Ryo KOYAMA, Chisato FUKAI, Yusuke YAMADA