Switch device and electronic instruments equipped with the switc

Details Switch device and electronic instruments equipped with the switc Switch device and electronic instruments equipped with the switc

1995-07-05

1997-03-18

Roskoski, Bernard

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

368227, G04B 1930

Patent

active

056129319

ABSTRACT:
When an electronic instrument has taken a predetermined attitude, an attitude-detecting switch incorporated in the instrument detects the attitude, and outputs a switch signal to a CPU. The CPU, in turn, drives a lighting device for lighting a liquid crystal display device. The lighting device is driven, for example, only when a predetermined number of pulses of the switch signal are generated within a predetermined period of time, or only when the switch signal has continued for a predetermined period of time or more. Thus, there are cases where the lighting device is not driven irrespective of the generation of the switch signal. As a result, the lighting device is prevented from operating so often, and hence the life of its battery is lengthened.

REFERENCES:
patent: 3963885 (1976-06-01), Brien
patent: 4003197 (1977-01-01), Haber
patent: 4095408 (1978-06-01), Kashio
patent: 4135067 (1979-01-01), Bitko
patent: 4775964 (1988-10-01), Alessio et al.
patent: 4912688 (1990-03-01), Syfert

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