Analog display electronic stopwatch

Details Analog display electronic stopwatch Analog display electronic stopwatch

1979-04-17

1981-05-26

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Mechanical stop time type

368113, G04F 700, G04F 800

Patent

active

042701970

ABSTRACT:
An analog display electronic stopwatch including at least one first hand driven during elapsed time measurement and a secondary hand driven after completion of elapsed time measurement is provided. The first hand indicates an arbitrary unit of elapsed time which is displayed during time measurement and the secondary hand indicates time in a fraction of the arbitrary time units, the secondary hand driven after elapsed time measurement. The stopwatch includes elapsed time measurement circuitry including a memory counter circuit for counting elapsed time in 1/100ths of a second and for providing a signal for driving a second and minute hand during time measurement, a secondary counter for providing a signal for driving a 1/100th second hand after completion of time measurement. The 1/100th second hand is driven to indicate the elapsed time under one second as determined by a coincidence detector for comparing the output of the secondary counter signal and that of the memory counter.

REFERENCES:
patent: 2190543 (1940-02-01), Ivie et al.
patent: 3884035 (1975-05-01), Jeannet

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