| 摘要 |
A rotation device includes a first frame (11, 21), a second frame (12, 24) connected to the first frame to be rotatable within a predetermined angle, and a spiral spring (15, 26) including a first end and a second end, the first end of the spiral spring being configured to be engaged with the first frame, the second end of the spiral spring being configured to be engaged with the second frame. The spiral spring is formed in such a way that mutually opposing sides of a wire rod (W1, W2) do not make contact with each other when the second frame rotates within the predetermined angle. |
