BEND-IMPARTING DEVICE FOR MEASURING BENDING LOSS, AND BENDING TEST DEVICE

WIPO Patent Application WO/2021/251473

A1

Provided is a bend-imparting device 30 having at least three mandrels (exemplified by a fixed mandrel 55 and a moving mandrel 65), the bend-imparting device 30 imparting a bend to a delivered optical fiber F by winding the optical fiber onto the mandrels. The diameter of the optical fiber is D, the radius of the mandrels is r, the direction linking the upstream contact point T1 where the optical fiber begins to contact a mandrel and the downstream contact point T2 where the optical fiber begins to separate from the mandrel is a first direction (exemplified by the horizontal direction), the interval between adjacent mandrels in the first direction is 2r+d, a direction orthogonal to the first direction is a second direction (exemplified by the vertical direction), and the interval between adjacent mandrels in the second direction is s. The angle θ formed by the second direction and the common internal tangent of the adjacent mandrel as seen from the center position of the optical fiber is 0-45 degrees (inclusive) and satisfies numerical expression 3.

KAWAGUCHI YUKI (JP)
TEI CHONDE (JP)
TERAUCHI TOMOKO (JP)
HATANAKA TOMOAKI (JP)

PCT/JP2021/022195

December 16, 2021

June 10, 2021

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SUMITOMO ELECTRIC INDUSTRIES (JP)

G01N3/00; G01M11/02

JP2012018134A	2012-01-26
JPS61239137A	1986-10-24
JPS61128134A	1986-06-16
JPH01203938A	1989-08-16
US20080272221A1	2008-11-06
US20030142943A1	2003-07-31

TOWA INTERNATIONAL PATENT FIRM (JP)

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