Device for the maintenance and control of the oscillations of th

Details Device for the maintenance and control of the oscillations of th Device for the maintenance and control of the oscillations of th

1974-07-09

1976-06-29

Jackmon, Edith Simmons

Oscillators

Relaxation oscillators

331183, G04C 304, H03F 334

Patent

active

039656675

ABSTRACT:
A device for maintaining constant the amplitude of the oscillation of an electro-magnetically driven balance wheel of a timepiece, whereby a first voltage is generated of an amplitude proportional to the amplitude of oscillation of the wheel. This is compared with a reference voltage and a signal is derived corresponding in amplitude and sign with the difference. This signal is then used to control the application of driving pulses to the balance wheel. The said driving pulses are preferably much shorter than one half-period of the balance wheel.

REFERENCES:
patent: 3577007 (1971-05-01), Cross
patent: 3648453 (1972-03-01), Aizawa et al.
patent: 3800241 (1974-03-01), Ochs
patent: 3812670 (1974-05-01), Nikaido et al.

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