摘要 |
A casing (22) includes end plates (20a, 20b), side plates (64a to 64d), and a hinge mechanism (68) for coupling the end plates (20a, 20b) and the side plates (64a to 64d). A power generation area (78) is defined by the distance L1 and the distance L2. When first hinges (70c) and second hinges (72a) of the hinge mechanism (68) are provided alternately, the first hinges (70c) and the second hinges (72a) are positioned within the distance L1. Preferably, the length of the shaft of a coupling pin (76a) is not more than the length L1. When the first hinges (70a) and the second hinges (74a) are provided alternately, the first hinges (70a) and the second hinges (74a) are positioned within the length L2. Preferably, the length of the shaft of a coupling pin (76b) is not more than the length L2. |