| 摘要 |
To provide a coupling structure capable of rotating and waterproofing a communication cable while communicating it. In a fitting portion, a communication hole having a proper diameter is provided to a portion ranging from the periphery of the center of a connector attaching hole to the center of a rotational axis of an engagement surface between the fitting portion and a fitting portion. A communication hole is provided in the fitting portion in the same manner. Finally, the connector attaching hole on the main body side and a connector attaching hole on the function unit side are in communication through the two communication holes passing through the center of the rotational axis. Therein, the communication cable communicates. A sealing member having a ring shape such as an O-shaped ring is provided at the opening of the communication hole of the hinge-piece fitting portion on the main body side. As diameters of the sealing member, the outer diameter that is slightly larger than the inner diameter of the communication hole and the inner diameter that is slightly smaller than the outer diameter of the communication cable are adopted.
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