| 摘要 |
<p>A stopwatch stores a lap time, measured by the operation of a lap switch (3), in a RAM (2). When the lap switch is operated, a minute hand (12) is immediately moved to a 0 o'clock position, and is started its rotation. The hand is rotated at such speed that the hand arrives at a 10 o'clock position after the preceding lap time stored in the RAM is elapsed. For the rotation of the hand at that speed a microprocessor unit (1) calculates the time interval to supply pulse signal to a step motor (10). Since the hand is moved to the 10 o'clock position at that speed, percentage of the lap time being measured at present to the preceding lap time can be immediately known. <IMAGE></p> |
