Horology: time measuring systems or devices – Chronological – With power monitor
Patent
1978-03-02
1980-09-02
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With power monitor
368 80, G04C 300, G04B 3712
Patent
active
042199999
ABSTRACT:
An electronic timepiece equipped with a battery life warning system, in which an output voltage of a battery are detected under a heavy load condition and a light load condition. In a first preferred embodiment, a time indicating means effects a display of time in a first predetermined more to provide an initial warning of the battery life when the output voltage drops below a first predetermined level during the heavy load condition and also effects of the display of time in a second predetermined mode to provide a second warning of the battery life when the output voltage of the battery drops below a second predetermined level lower than the first predetermined level. In a second preferred embodiment, when the output voltage of the battery drops below the first predetermined level, a drive signal for driving the time indicating means is produced so as to drive the time indicating means with a sufficient driving energy substantially equal to that of a drive signal being produced when there is no voltage drop in the battery. When the output voltage of the battery drops below the second predetermined level, a control signal is applied to the time indicating means, which is consequently rendered to display the time information in a modulated form for thereby providing a warning of the battery life.
REFERENCES:
patent: 3812670 (1974-05-01), Nikaido et al.
patent: 3832629 (1974-08-01), Cerhek, Jr.
patent: 3949545 (1976-04-01), Chihara
patent: 3998043 (1976-12-01), Tamaru et al.
patent: 4014164 (1977-03-01), Fujita
patent: 4028880 (1977-06-01), Ueda
patent: 4041691 (1977-08-01), Chihara et al.
patent: 4043112 (1977-08-01), Tanaka
patent: 4129981 (1978-12-01), Nomura et al.
Ichikawa Singo
Kato Yoshiaki
Citizen Watch Company Limited
Miska Vit W.
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