| 摘要 |
A casing includes end plates, side plates, and a hinge mechanism for coupling the end plates and the side plates. A power generation area is defined by the distance L 1 and the distance L 2. When first hinges and second hinges of the hinge mechanism are provided alternately, the first hinges and the second hinges are positioned within the distance L 1. Preferably, the length of the shaft of a coupling pin is not more than the length L 1. When the first hinges and the second hinges are provided alternately, the first hinges and the second hinges are positioned within the length L 2. Preferably, the length of the shaft of a coupling pin is not more than the length L 2.
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