| 摘要 |
A flexible printed circuit board that electrically connects a main body and a rotary body to each other is twisted in advance through an angle that is a half of an angle of rotation through which the rotary body is rotated. One end of the flexible printed circuit board is fixed to the main body, and the other end thereof is fixed to the rotary body. The rotary body is rotated in a direction causing the twist of the flexible printed circuit board to diminish.
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