1975-11-25
1977-05-17
Witkowski, Stanley J.
58 74, G10F 800, G10F 1000
Patent
active
040233456
ABSTRACT:
A digital display electronic stop-watch control circuit for facilitating the control of the start, stop, lap and reset functions in an electronic stop-watch is provided. The control circuit is provided for use in an electronic timepiece having counter circuitry for producing elapsed time signals, memory circuitry for storing said elapsed time signals and display circuitry for displaying either elapsed time or stored time in response to the elapsed time signals produced by the counter circuitry or in response to the stored time signals produced by the memory circuitry being respectively applied thereto. The control circuit of the instant invention is characterized by being coupled to the counter circuitry, memory circuitry and digital display circuitry. First and second manually operated switching circuits are respectively coupled to the control circuit. The control circuit in response to an initial actuation of the first switching circuit starts the count of the counter circuit and in response to the next actuation of the first switching circuit inhibits the count of the counter circuit. The control circuit, in response to an initial actuation of the second switching circuit when such actuation occurs during the interval between an initial actuation of the first switching circuit and a next actuation of the first switching circuit terminates the application of elapsed time signals to the memory circuit, and changes the digital display circuitry to display time in response to the stored time signals in the memory circuitry and in response to the next actuation of the second switching circuit returns the digital display circuitry to displaying time in response to the elapsed time signals produced by the counter circuit.
REFERENCES:
patent: 3686880 (1972-08-01), Samejima
patent: 3757509 (1973-09-01), Fujita
patent: 3789600 (1974-02-01), Champan
patent: 3795099 (1974-03-01), Tsuruishi
patent: 3854277 (1974-12-01), Samejima et al.
patent: 3934400 (1976-01-01), Nishimura et al.
patent: 3950935 (1976-04-01), Naito
Kabushiki Kaisha Suwa Seikosha
Witkowski Stanley J.
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