| http://www.w3.org/ns/prov#value | - In the above-described embodiments and modified example, the optical fiber 12 is formed by the core 14 which is formed from silicone rubber and the clad 16 which is formed from a flexible material such as a fluorine resin or the like, and the optical fiber 12 overall has a preferable elasticity (the characteristic that it is easy for a transmission loss to arise due to the optical fiber 12 being d
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