| 摘要 |
PURPOSE:To enable battery exchange of a light emission source for illuminating to be performed irrespective of the operation of the watch driving part by making the battery for the light emission source for illuminating and the watch driving part separate. CONSTITUTION:A watch driving part 1 uses a first battery 3 as a power source and a light emission source 4 for illuminating is connected to another battery 5 via switch 2. The switch 2 prevents wasteful battery consumption and the illuminating light emission source 4 emits light by being connected to the battery 5 via the switch 2 for a specified time by the operation of the watch driving part 1. Hence, the consumption of the battery 3 of the watch driving part 1 prolongs and when the battery 5 used for the light emission source 4 for illuminating of earlier consumption is going to be exchanged, it may be peroformed irrespective of the operation of the watch driving part 1 and therefore the need for time setting is eliminated. |
