Electronic watches

Details Electronic watches Electronic watches

1978-12-12

1980-07-29

Weldon, Ulysses

Horology: time measuring systems or devices

Chronological

With simultaneous time indicating means

368 80, 368218, G04C 300

Patent

active

042144345

ABSTRACT:
A miniature electronic timepiece whose analog-display time-indicating hands are driven by the rotor of a stepping motor actuated by low-frequency periodic timing pulses derived by frequency division from a high-frequency crystal-controlled time base. The motor, in addition to a stator coil wound on a core, includes an auxiliary coil wound on the same core to define a transformer whose primary is the auxiliary coil and whose secondary is the stator coil. To power the electronic watch, a voltage at a predetermined level is required, this being supplied by a converter formed by an electronic chopper interposed between the primary of the transformer and a d-c source whose output is at a different voltage level. Thus the d-c voltage applied to the primary is periodically interrupted, the resultant a-c voltage yielded by the secondary being rectified to provide the desired power voltage.

REFERENCES:
patent: 3341723 (1967-09-01), Tourtellot
patent: 3817021 (1979-06-01), Bergey
patent: 4106279 (1978-08-01), Martin et al.

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