| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize an endoscope having an insertion part with a fine diameter and with good assembleability. SOLUTION: A channel 15 for inserting the endoscope is formed of an amorphous fluorinated resin as an inner wall layer 21 and an outer wall layer 22 of the thickness part of the channel 15 as a cladding part (peripheral part). An intermediate layer 23 between the inner wall layer 21 and the outer wall layer 22 is formed as a core part (central part) by using a material having refractive index higher than those of the inner wall layer 21 and the outer wall layer 22, for example, by PMMA (polymethylmethacrylate resin) having a refractive index of about 1.49, and is used as an illuminating light transmission part.</p> |
