Horology: time measuring systems or devices – Mechanical time base – Mainspring
Patent
1988-12-09
1990-02-13
Roskoski, Bernard
Horology: time measuring systems or devices
Mechanical time base
Mainspring
368205, G04C 100
Patent
active
049012959
ABSTRACT:
A barrel spring winding device comprises a solar cell (3) arranged to receive ambient light, a capacitor (4) connected to the terminals of the cell, a stepping motor (6) and a control circuit (5). The input of the circuit is connected to the terminals of the capacitor and its output to the terminals of the motor. The rotor of the motor is operatively connected to wind a barrel spring, for example of a watch. The cell (3) charges the capacitor (4) and when the voltage thereof, measured by a differential amplifier (23), reaches a reference voltage (V.sub.r), the capacitor is connected to the terminals of the motor by a switching transistor (27). Discharge of the capacitor supplies to the motor a drive pulse whose duration is determined by a one-shot flip-flop (25). After the pulse, the capacitor is once again charged by the cell. To prevent the motor from receiving a drive pulse before it has stopped, i.e. in the event of intense lighting of the cell, another one-shot flip-flop (29) inhibits control of the switching transistor (27) during a period of time corresponding to the time needed for the rotor to make one complete step.
REFERENCES:
patent: 3724200 (1973-04-01), Donner
patent: 4760564 (1988-07-01), Odagiri
Taguezout Daho
Xuan Mai T.
Asulab S.A.
Roskoski Bernard
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