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Patent Issued for Optical Fiber Tape Core Wire Manufacturing Method, Manufacturing Device, and Optical Fiber Tape Core Wire and Optical Fiber Cable...

May 28, 2014



Patent Issued for Optical Fiber Tape Core Wire Manufacturing Method, Manufacturing Device, and Optical Fiber Tape Core Wire and Optical Fiber Cable Manufactured with Said Manufacturing Method

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Matsuzawa, Takashi (Sakura, JP); Take, Yukiko (Sakura, JP); Isaji, Mizuki (Chiba, JP); Osato, Ken (Sakura, JP); Okada, Naoki (Yotsukaido, JP), filed on August 22, 2013, was published online on May 13, 2014.

The assignee for this patent, patent number 8724946, is Fujikura Ltd. (Tokyo, JP).

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a method of manufacturing an optical fiber tape core wire, a manufacturing device of the same, and an optical fiber tape core wire and an optical fiber cable manufactured by the method.

"For example, Japanese Patent Laid-open Publication No. 2007-178883 (PTL1) discloses an optical fiber tape core wire including four sub-unit tapes which are arranged side by side and are integrated with tape resin. Each sub-unit tape includes four optical fiber wires which are arranged side by side and are integrally coated with tape resin. Markings are printed on the surface of the integrating tape resin for identifying each sub-unit tape.

"The markings include identification patterns (for example, dot marks) which can identify each sub-unit tape when the optical fiber tape core wire is separated into the sub-unit tapes. For example, the first sub-unit tape has a print of a one-dot mark, the second sub-unit tape has a print of two-dot mark, the third sub-unit mark has a print of a three-dot mark, and the fourth sub-unit mark has a print of a four-dot mark.

"When the optical fiber tape core wire with such a print is separated into the individual sub-unit tapes, a sub-unit tape including the one-dot mark can be visually identified as the first sub-unit tape.

"However, in the optical fiber tape core wire of PTL 1, the markings are printed on the surface of the tape resin with which the four sub-unit tapes are integrated. If each separated sub-unit tape is further separated into individual optical fiber wires, the dot marks used as the identifiers of the sub-units are therefore removed. Accordingly, it is not known which sub-unit tape each separated optical fiber wire is associated with. In order to solve the above problem, it is possible to print marks on the optical fiber wires themselves. However, this requires two printing steps and complicates the manufacturing process.

"Accordingly, an object of the present invention is to provide a method of manufacturing an optical fiber tape core wire with which, even when the optical fiber tape core wire is separated into optical fiber wires, it can be determined using markings formed by one time print which optical fiber tape core wire each of the optical fiber wires is associated with and the positions of the printed markings can be aligned, a manufacturing device of the same, and an optical fiber tape core wire and an optical fiber cable manufactured by the above method."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "An invention according to claim 1 has a feature of including: a printing step of causing a plurality of optical fiber wires to run, each optical fiber wire including a resin coating layer of resin coating a silica glass fiber, and using a printer provided in a middle of a path of running, to print a marking for identifying the optical fiber tape core wire on a part of each of the plurality of optical fiber wires in the longitudinal direction; a colored layer formation step of using a coloring device provided in downstream of the printer in a fiber running direction to form translucent colored layers of different colors on the respective optical fiber wires with the markings printed in the printing step; a colored layer curing step of using a colored layer curing device provided in downstream of the coloring device in the fiber running direction to cure the colored layer; a tape forming layer formation step of using a tape forming device provided in downstream of the colored layer curing device in the fiber running direction to coat the plurality of optical fiber wires with colorless transparent resin collectively into a tape and form a tape forming layer; a tape forming layer curing step of using a tape forming layer curing device provided in downstream of the tape forming device in the fiber running direction to cure the tape forming layer; and a fiber running length adjustment step of using fiber running length adjustment devices adjusting the running lengths of the plurality of optical fiber wires running from the respective printers to the tape forming device to adjust the running lengths of all the optical fiber wires between the respective printers and tape forming device to a same length.

"An invention according to claim 2 is the method of manufacturing an optical fiber tape core wire according to claim 1, the method further including: a fiber running length correction step of measuring the position of the marking printed on each optical fiber wire in just upstream or downstream of the tape forming device, calculating a relative positional shift amount of the measured position of each marking, and based on the relative positional shift amounts, operating the fiber running length adjustment devices to adjust the running lengths of all the optical fiber wires between the respective printers and the tape forming device to a same length.

"An invention according to claim 3 has a feature of including: a printer which causes a plurality of optical fiber wires to run, each optical fiber wire including a resin coating layer of resin coating a silica glass fiber, to print a marking for identifying an optical fiber tape core wire on a part of each of the plurality of optical fiber wires in the longitudinal direction in a middle of a path of running; a coloring device which forms translucent colored layers of different colors on the respective optical fiber wires with the markings printed; a colored layer curing device which cures the colored layer; a tape forming device which coats the plurality of optical fiber wires with colorless transparent resin all collectively a tape to form a tape forming layer; a tape forming layer curing device which cures the tape forming layer; and fiber running length adjustment devices which adjust the running lengths of the plurality of optical fiber wires running from the respective printers to the tape forming device to a same length.

"An invention according to claim 4 is the manufacturing device for an optical fiber tape core wire according to claim 3, further including: a marking position measuring device which measures the position of the marking printed on each optical fiber wire in just upstream or downstream of the tape forming device; and a controller which calculates a relative positional shift amount of the measured position of each marking, and based on the relative positional shift amounts, operates the fiber running length adjustment devices to adjust the running lengths of all the optical fiber wires between the respective printers and the tape forming device to a same length.

"An invention according to claim 5 is an optical fiber tape core wire manufactured by the manufacturing method according to claim 1 or 2.

"An invention according to claim 6 is an optical fiber cable, including a plurality of the optical fiber tape core wires according to claim 5 accommodated in the cable.

"According to the present invention, if in the fiber running adjustment step, the fiber running length adjustment devices, that adjust the running lengths of the optical fiber wires running from the respective printers to the tape forming device, are used to adjust the running lengths of all the optical fiber wires between the respective printers and the tape forming device to a same length, the positions of the markings printed on all the optical fiber wires can be aligned with one another to the same positions in the longitudinal direction of the optical fiber wires at the position in just upstream of the tape forming device. When the optical fiber wires are then formed into a tape in the tape forming layer formation step, it is possible to manufacture an optical fiber tape core wire in which the positions of the markings of all the optical fiber wires are aligned. Accordingly, even if the optical fiber tape core wire is separated into optical fiber wires, it can be easily recognized which optical fiber tape core each of the separated optical fiber wire is associated with by seeing the type of the marking thereof."

For more information, see this patent: Matsuzawa, Takashi; Take, Yukiko; Isaji, Mizuki; Osato, Ken; Okada, Naoki. Optical Fiber Tape Core Wire Manufacturing Method, Manufacturing Device, and Optical Fiber Tape Core Wire and Optical Fiber Cable Manufactured with Said Manufacturing Method. U.S. Patent Number 8724946, filed August 22, 2013, and published online on May 13, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=41&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2002&f=G&l=50&co1=AND&d=PTXT&s1=20140513.PD.&OS=ISD/20140513&RS=ISD/20140513

Keywords for this news article include: Fujikura Ltd.

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Source: Journal of Engineering


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