| 摘要 |
The problem is to provide a battery lid structure for a timepiece case, which does not require complicate machining, such as for slant surfaces and stoppers, in an inner surface of a back lid or case bottom surface, and can reduce a thickness. The back lid has, at an immediately underneath the battery accommodating hole, a different-shaped battery hole having a pair of larger-diameter arcs and a pair of smaller-diameter arcs in an alternate fashion. A battery lid is fitted in the battery hole in a manner described later. The battery lid has arcuate penthouses provided in plurality corresponding to the larger-diameter arcs on an inner side of the timepiece and having a smaller radius than a radius of the larger-diameter arc to have walls at ends thereof, different-shaped barrels continuing from a timepiece-outer side of the arcuate penthouse and having a radius smaller than the radius of the smaller-diameter arc, straight barrels continuing from a timepiece-outer side of the different-shaped barrel and having a radius greater than the radius of the arcuate penthouse, and a larger-diameter flange continuing from a timepiece-outer side of the straight barrels and having a radius greater than the radius of the larger-diameter arc to provide a rectangular groove in its outer surface. An elastic O-ring for waterproof seal is clamped between a timepiece-interior-side surface of the larger-diameter flange and a timepiece-exterior-side surface of the back lid or case bottom surface. The arcuate penthouse has tapered portions formed at circumferential tips on a wall-opposed side, and the arcuate penthouse has an arcuate protrusion in part of a surface on the timepiece-exterior side.
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