Stopwatch

Details Stopwatch Stopwatch

1992-03-26

1992-09-29

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

368113, G04F 800, G04F 1000

Patent

active

051518856

ABSTRACT:
A stopwatch according to the present invention can measure a lap time by the operation of a lap switch of a key input portion and stores the measured lap time in a RAM. When the lap switch is operated, a minute hand is immediately moved to a position of 0 o'clock, and is started its rotation from the position of 0 o'clock. The hand is rotated at such speed that the hand arrives at a position of 10 o'clock after the preceding lap time stored in the RAM is elapsed. In order to rotate the hand at the above described speed, a microprocessor unit calculates the time interval to supply pulse signal to a step motor. Since the hand is moved from the position of 0 o'clock to the position of 10 o'clock at the above described speed, percentage of the lap time being measured at present with respect to the preceding lap time can be immediately known.

REFERENCES:
patent: 3691757 (1972-09-01), Merino et al.
patent: 4211066 (1980-07-01), Kusumoto et al.
patent: 4523857 (1985-06-01), Ushikoshi
patent: 4545686 (1985-10-01), Ushikoshi
patent: 4831605 (1989-05-01), Suga

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