Horology: time measuring systems or devices – Power supply details – Electrical
Patent
1988-01-26
1989-03-28
Roskoski, Bernard
Horology: time measuring systems or devices
Power supply details
Electrical
G04B 100
Patent
active
048170631
ABSTRACT:
An analog electronic timepiece powered by a battery, which prevents malfunctions of the divider circuits within the timepiece during periods of high load is provided. An oscillator circuit produces a high frequency time standard signal. A divider circuit divides the high frequency time standard signal to a low frequency time standard signal. An analog display means provides a visual indication of the time. A drive circuit including a drive coil and a motor is coupled to the divider circuit and analog display means and produces drive pulses in responses to the low frequency drive signals to drive the analog display means. The DC resistance of the drive coil is at least twice as great as the internal resistance of the battery. A first time constant of the battery associated with the reduction of battery output voltage during driving pulses and a second time constant associated with restoring battery output voltage after the driving pulse are both greater than 200 msec when the internal resistance of the battery is greater than 100.OMEGA.. A regulating circuit coupled to the battery, oscillator circuit and divider circuit receives the battery output voltage and outputs a regulated voltage to the oscillator circuit and divider circuit.
REFERENCES:
patent: 4358728 (1982-11-01), Hashimoto
patent: 4395138 (1983-07-01), Chihara
patent: 4441825 (1984-04-01), Morokawa
Kaplan Blum
Roskoski Bernard
Seiko Epson Corporation
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