Analog indicator type electronic timepiece and charging method t

Details Analog indicator type electronic timepiece and charging method t Analog indicator type electronic timepiece and charging method t

1995-04-26

1996-12-03

Roskoski, Bernard

Horology: time measuring systems or devices

Chronological

With supplemental power source

368205, 368204, G04C 1000

Patent

active

055815197

ABSTRACT:
An analog indication type electronic timepiece includes a power generation device for transforming kinetic energy produced by motions of a user into electric energy and for causing the electric energy to output from a magnetic coil as an electric charging energy; a secondary power source charged by said electric charging energy; a timepiece circuit driven by a charged energy from said secondary power source to output motor drive pulses; and a drive motor including a drive coil and a drive rotor rotatably driven when the drive coil is energized by said motor drive pulses. This analog indication type electronic timepiece further includes an anti-overcharging device forming a bypass circuit for causing said electric charging energy to bypass relative to said secondary power source when the voltage at said secondary power source reaches a predetermined level, thereby preventing the overcharging to the secondary power source; and a current limiting device for forcedly limiting the bypass current flowing through said bypass circuit when the motor drive pulses are being output from said timepiece circuit, whereby an accurate analog time indication can be made while preventing a malfunction in the drive motor during the anti-overcharging operation to the secondary power source.

REFERENCES:
patent: 4644246 (1987-02-01), Knapen

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