| 摘要 |
PURPOSE: To prevent fluctuation of a present time due to maloperation, a falling matter or the like by setting on a present time matching mode only when an addition key and a subtraction key are pushed simultaneously, completing present time matching, and locking the present time matching mode after a specified time elapses. CONSTITUTION: Since an upward key (+) 16a and a downward key (-) 16b of a present time matching key 16 are pushed simultaneously in the case where present time matching is performed, for instance, locking is released and a time matching mode is set when they are pushed for a few seconds, the keys (+) 16a , (-) 16b are pushed properly and matched to a present time. After the present time matching is completed, the key 16 is automatically set on a locking state, for instance, after 10-30 seconds elapse in the specified time. Accordingly, even if the key 16 is pushed accidentally or by careless handling, the present time is not fluctuated and careless modification of the present time is prevented by the minimum number of the keys. |
