Tokyo, Japan
Tokyo, Japan

Fujikura Ltd. is a global, Tokyo-based electrical equipment manufacturing company, developing and manufacturing power and telecommunication systems products, including devices for optical fibres, such as cutters and splicers.Fujikura was founded by Zenpachi Fujikura when he began manufacturing silk and cotton insulated winding wires in 1885. In 1910 Fujikura Electric Wire Corporation was established with Tomekichi Fujikura, Zenpachi's younger brother, acting as the company's representative. Over the years the company expanded both in Japan and overseas and as of 2013 the company had subsidiaries across Europe, Asia, North and South America and North Africa.The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index.In February 2014 the company received an order of special large core fibers from Tokyo University for the Subaru Telescope located on Mauna Kea, Hawaii. Wikipedia.

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A planar optical waveguide device includes: a substrate; and an optical waveguide that includes a core and a cladding. The core forms a preceding-stage mode conversion section and a subsequent-stage mode conversion section, the preceding-stage mode conversion section being configured to convert a mode of input light, the subsequent-stage mode conversion section being configured to convert a mode of light output from the preceding-stage mode conversion section. Sectional shapes of the first core portion and the second core portion are not congruent with each other at an input end of the preceding-stage mode conversion section, the sectional shape or size of at least one core is continuously changed along a light waveguide direction, and sectional shapes of the first core portion and the second core portion are congruent with each other at an output end of the preceding-stage mode conversion section.


Patent
Fujikura Ltd | Date: 2016-11-07

An optical connector of the disclosure includes: an optical connector body including a housing that houses a ferrule, and a coupling that is movable relative to the housing, the optical connector body being employed to release a latched state by moving the coupling rearward relative to the housing; and a pull member including a pull operation part that is located rearward of the coupling. The pull member includes a pair of side plate parts to be respectively arranged along the side surfaces of the coupling. Each side plate part includes an inner projection that projects inward from an inner surface. The coupling includes a recessed engagement part. The inner projection of the pull member engages with the engagement part of the coupling. When the pull operation part of the pull member is pulled rearward, the coupling is moved rearward relative to the housing by the inner projection of the pull member.


Patent
Fujikura Ltd | Date: 2016-03-09

A method for producing an optical fiber unit by winding at least two bundling members on the outer circumference of an optical fiber bundle formed by bundling a plurality of optical fibers, including: feeding the optical fiber bundle from a fiber passage member; feeding the bundling members while forming intersection points between two of the bundling members on the outer circumference of the optical fiber bundle by feeding at least one of the bundling members from a bundling member passage part of a rotating member arranged to the outer circumference of the fiber passage member, while causing the rotating member to oscillate, with the feeding direction serving as the axis; and fusion-bonding the bundling members at their intersection points.


In order to achieve, even at an increased line speed, joining of bundling members at sections where their winding directions are reversed, the invention provides a method for producing an optical fiber unit by winding at least two bundling members on the outer circumference of an optical fiber bundle formed by bundling a plurality of optical fibers. This method involves: feeding the optical fiber bundle in a feeding direction from a fiber passage member; feeding the bundling members while forming intersection points between two of the bundling members on the outer circumference of the optical fiber bundle by feeding at least one of the bundling members from a bundling member passage part of a rotating member arranged to the outer circumference of the fiber passage member, while causing the rotating member to oscillate, with the feeding direction serving as the axis; and fusion-bonding the bundling members at their intersection points by passing the optical fiber bundle and the bundling members through a heating unit arranged downstream from the fiber passage member and the rotating member in the feeding direction, and thus forming an optical fiber unit in which the winding direction, with respect to the optical fiber bundle, of the at least one of the bundling members is reversed at a fusion-bonded point between the bundling members.


Patent
Fujikura Ltd and Chiba University | Date: 2017-09-13

The present inventors have surprisingly found that a deoxyhypusine synthase (DHPS) gene, which was previously reported to correlate with prostate cancer and cervical cancer, is highly responsive to arteriosclerosis or digestive system cancer, whereby the gene can be used as a desired marker for arteriosclerosis or digestive system cancer. The present invention has been accomplished on the basis of this finding. Specifically, the present invention provides a method for determining arteriosclerosis or digestive system cancer, which method includes detecting expression of a deoxyhypusine synthase gene in a test sample (preferably a blood sample), and determining arteriosclerosis or digestive system cancer of a test subject from which the test sample has been obtained, on the basis of an increase in the gene expression as an index.


Patent
Fujikura Ltd | Date: 2017-09-20

Disclosed is a photoelectric conversion element including at least one photoelectric conversion cell. The photoelectric conversion cell includes an electrode substrate, a counter substrate facing the electrode substrate, an oxide semiconductor layer provided on the electrode substrate, an electrolyte provided between the electrode substrate and the counter substrate, and an annular sealing portion joining the electrode substrate and the counter substrate together. The oxide semiconductor layer includes a main body portion provided inside the sealing portion and on the electrode substrate and extending straight from the electrode substrate toward the counter substrate, and a protruding portion which protrudes from the main body portion toward the sealing portion and does not come into contact with the electrode substrate. A width of a second surface of the oxide semiconductor layer facing the counter substrate is longer than a width of a first surface which is a boundary surface between the oxide semiconductor layer and the electrode substrate in a cross section along a thickness direction of the oxide semiconductor layer.


Patent
Fujikura Ltd | Date: 2017-09-27

Disclosed is a dye-sensitized photoelectric conversion element including at least one dye-sensitized photoelectric conversion cell. The dye-sensitized photoelectric conversion cell includes a first electrode, a second electrode facing the first electrode, an oxide semiconductor layer provided on the first electrode, and an electrolyte provided between the first electrode and the second electrode. The second electrode includes an annular portion, an approaching portion approaching the oxide semiconductor layer closer than the annular portion and an annular connecting portion connecting the annular portion and the approaching portion, and the oxide semiconductor layer includes an inner part facing the approaching portion of the second electrode on the first electrode and an annular outer part which is provided around the inner part and faces the connecting portion of the second electrode. The outer part includes a plurality of linear portions separated from one another and a corner portion connecting two adjacent linear portions to each other among the plurality of linear portions in a case in which the outer part is viewed in a thickness direction of the oxide semiconductor layer, a thickness of the corner portion of the outer part is greater than a thickness of the linear portion of the outer part, and a thickness of the linear portion of the outer part is greater than a thickness of the inner part.


Patent
Fujikura Ltd | Date: 2017-09-27

The present invention achieves a fiber laser having a high reflection resistance. A length of an optical fiber MMF is set so that a condition is satisfied at each point on an individual optical path of a fiber laser (FL2), the condition being that a difference between time at which a power of a forward Stokes beam (SF) is at a maximum value and time at which a power of a backward Stokes beam (SB) is at a maximum value is greater than a sum of a half width at half maximum of the power of the forward Stokes beam (SF) and a half width at half maximum of the power of the backward Stokes beam (SB).


Disclosed is a flame retardant resin composition comprising a polyolefin resin, calcium carbonate particles blended at a ratio of 5 parts by mass or more and 80 parts by mass or less relative to 100 parts by mass of the polyolefin resin, aluminum hydroxide blended at a ratio of 50 parts by mass or more and 125 parts by mass or less relative to 100 parts by mass of the polyolefin resin, a silicone-based compound blended at a ratio of more than 1 part by mass and 10 parts by mass or less relative to 100 parts by mass of the polyolefin resin, a fatty acid-containing compound blended at a ratio of 3 parts by mass or more and 20 parts by mass or less, and a zinc-containing inorganic compound blended at a ratio of 1 part by mass or more and 7 parts by mass or less. In the flame retardant resin composition, the calcium carbonate particles and aluminum hydroxide are blended in total at a ratio of 55 parts by mass or more and 130 parts by mass or less relative to 100 parts by mass of the polyolefin resin.


Disclosed is an electrolyte of a dye-sensitized photoelectric conversion element for low illuminance which contains a halogen, a halide salt forming a redox couple with the halogen, and a silver halide. In this electrolyte, the concentration of the silver halide is from 0.0001 to 10 mM.

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