Adjustable piezoelectric transducer for a watch
AssigneeTimex Corporation
InventorJack Schwarzschild
Life of this patent
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Abstract
A watch includes a piezoelectric wafer mounted on a membrane held by its peripheral edge inside a watch caseback. A frequency adjustment device mounted in the caseback includes a rotatable arm contacting the membrane and movable to adjust the resonant frequency of the membrane and piezoelectric crystal vibrating assembly. The frequency of the piezoelectric transducer may be adjusted to match a desired frequency of an electrical or sound signal.
Claims4
In a watch having a case containing a movement, a power source, and electric circuitry, a piezoelectric transducer comprising a flexible disc-shaped membrane and a piezoelectric wafer attached thereto, and a caseback enclosing the watch movement within the case, the improvement comprising:
- frequency adjustment means disposed within said caseback and accessible from the exterior of the watch case, said frequency adjustment means including a movable element disposed within the watch case and having a portion contacting said membrane, said element being movable so as to contact said membrane at varying radial locations when said frequency adjustment means is actuated outside the watch to change the vibratory characteristics of said piezoelectric transducer.
Dependencies are inferred from the claim text.