PROBLEM TO BE SOLVED: To provide a curve sensor having a relatively broad measurement range and capable of measuring a relatively large amount of curve.SOLUTION: The curve sensor comprises: an optical fiber or a light guide member including a core, and at least one-layer covering that covers an outer peripheral face of the core at least one covering removal part that is exposed by removing at least an outermost layer of the covering a covering lateral face that is formed at a boundary between the covering and the covering removal part by providing the covering removal part on the covering and a light absorber that is formed on the covering removal part by at least partially exposing the covering removal part.COPYRIGHT: (C)2014,JPO&INPIT【課題】測定レンジが比較的広く、比較的大きな湾曲量を測定可能な湾曲センサを提供する。【解決手段】コアと、コアの外周面を被覆している少なくとも1層の被覆とを有する光ファイバあるいは導光部材と、被覆のうちの少なくとも最外層を除去することによって露出された少なくとも1つの被覆除去部と、被覆に被覆除去部を設けることによって被覆と被覆除去部との境界に形成された被覆側面と、被覆除去部が少なくとも部分的に露出しているようにして前記被覆除去部上に形成された光吸収体とを具備する湾曲センサである。【選択図】図1
