Document Type and Number:
Japanese Patent JPS5127370
Kind Code:
A
Abstract:
An electronic timepiece battery-potential detecting circuit unaffected by temperature changes is provided. An electronic timepiece includes a DC power source such as a battery for providing an effective potential for energizing the timekeeping circuitry and display thereof. An electronic switching element is provided for detecting the effective potential of the DC power source. The electronic switching element includes a first electrode coupled to the power source for detecting the effective potential thereof, and two further electrodes defining a closed current path in response to the control electrode being referenced above a predetermined potential, the two further electrodes defining an open current path in response to the potential detected by the control electrode dropping to the predetermined potential, at least one of the further electrodes having a current temperature coefficient of substantially zero when the effective potential of the DC power source is above the predetermined potential.
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Inventors:
CHIHARA HIROYUKI
Application Number:
JP9957674A
Publication Date:
March 06, 1976
Filing Date:
August 30, 1974
Export Citation:
Assignee:
SUWA SEIKOSHA KK
International Classes:
G04C10/00; G01R19/165; G01R31/36; G04C10/04; H03K17/30; (IPC1-7): G04C3/00