An electronic timepiece in which the output of a stable, high-frequency standard such as a crystal oscillator, is fed to a presettable frequency-divider to produce periodic low-frequency output pulses for actuating a time display. The frequency of the oscillator lies in a range somewhat below an assigned value producing, upon division, the desired number of output pulses for accurate timing, the resultant deficiency being made up by adding pulses to input stages of the divider sufficient to comp...

A magnetic clock comprises an inner revolvable magnetic member and an outer revolvable magnetic member, each being of generally hour glassed shaped and being arranged concentrically with respect to each other. An hour glassed shaped bearing is positioned concentrically between and exerts a repulsive force on the inner and outer members. The inner and outer revolvable magnetic members each have a plurality of circumferentially spaced apart peripheral elements integrally formed therewith which pro...

An extremely thin and small electronic watch made possible by a crystal oscillating in the megahertz range and coupled to the display of the watch through two frequency dividers having basically different characteristics.

A universal watch wherein the hour hand may be corrected incrementally by an hour or less in response to the pushing, pulling or turning a stem or shaft.

An electromagnetic driving apparatus for both driving at a uniform oscillation a balance wheel in a timepiece as well as detection and having a driving circuit which provides a series of pulses to an electromagnetic coil supported between two permanent magnets having opposite polarity and mounted on the balance wheel. The coil, due to the electromagnetic effect imposed upon the coil by the periodically passing magnets, causes the production of a series of resultant positive pulses for driving th...

A continuous switching or incremental advancing device for the gear mechanism of an electric wrist watch having a preferably electromagnetically driven balance and a switch armature driven by the balance. The switching device is provided with a long input arm and a short output arm and with a ratchet wheel driven by the switch armature.

An electronic wristwatch in which time is displayed by means of a plurality of separately sealed, independently rotatable, coplanar concentric rings. Each ring carries a plurality of magnetic domains and is independently stepped by a set of electromagnets driven by a multiphase pulse train. Typically, each ring is stepped at a different rate so as to display a different unit of time, this being achieved by suitably scaling the frequencies of the multiphase pulse trains which drive the different ...

A drive arrangement for a timekeeping system comprising an electrostatic motor including a rotor having a dielectric surface and a pair of electrodes operatively associated with the rotor for driving the rotor in response to a d-c potential applied across the electrodes. In one embodiment, one of the electrodes is mounted on one of the tines of a tuning fork, and the dielectric rotor surface is serrated for impulsing the tuning fork to vibrate the same while synchronizing the speed of the rotor ...

A time correction device for electronic watches having multi-stage divider circuitry for dividing the high frequency output signals of an oscillator into low frequency timing signals including a gate at the input of each divider stage to be corrected for selectively applying to said divider stage the output signal of the prior stage or the inverse of said prior stage output signal. A switch is provided for manually actuating the gate to pass one of the prior stage output signal and the inverse t...

An approach computer device is provided for an aircraft approaching a landing field to enable the pilot to have before him during the approach a device which shows the distance to the landing field and, correlated with that distance, the altitude at which the plane should be flying at such distance. The distance to be flown is set as the plane passes over the final approach fix from which the plane is to approach the field at a constant rate of speed. The device is calibrated to provide a consta...