| 摘要 |
A solar panel (9) determines whether or not a wristwatch (1) is in darkness. When the darkness has continued for a predetermined time period, e.g., for 61-70 minutes, it is determined that the wristwatch (1) is not in use and set in a sleep state. Out of seconds, center and hour hands (2, 3 and 4), at least the seconds hand (2) is rotated to a reference position (00-second position) and stopped, and positions of the center and hour hands (3 and 4) are detected. Therefore, power consumption can be reduced when the wristwatch (1) is not in use.
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