| 摘要 |
<p>A battery cover includes a first cover portion, a second cover portion, and a coupling portion that is arranged in a position lower than upper surfaces of the first cover portion and the second cover portion, between the first cover portion and the second cover portion. The coupling portion includes a connection portion that is fixed to the second cover portion and a hinge portion that is thinner than the connection portion. The hinge portion is provided such that hinge end portions on both sides are thicker than a hinge center portion. Each of the hinge end portions is formed such that a side end surface thereof is a curved surface which is gently inclined from the side of the first cover portion to the side of the second cover portion and that an upper surface thereof is formed into a substantially arc-shaped curved surface which is thinnest in its center and inclined upward to gradually become thicker from the center toward both support ends.</p> |
