| 摘要 |
PROBLEM TO BE SOLVED: To easily produce mutually connected, extremely slender members which are suitable for an endoscope by folding back a material formed in a rectangular wave shape at each top part of the rectangular waves and then folding back again the material with its direction changed at each fold-back part. SOLUTION: The material of a flexible printed circuit board 30 is formed in a rectangular wave shape excluding a part that is to be disposed in a curved tube part. Then the material is folded back by 180 degrees at each top part of the rectangular waves and then folded back again by 180 degrees in the direction different from the first folding direction by 90 degrees. Thus, the fold-back parts 30b are formed and the parts equivalent to a single wave are linearized so that the board 30 is formed in a connected rectilinear shape as a whole. As a result, the wiring reliability and space properties of the endoscope are improved.
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