Resonator with matched balance spring and balance
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United States of America Patent
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May 12, 2015
Grant Date -
Mar 6, 2014
app pub date -
Aug 28, 2013
filing date -
Sep 4, 2012
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Abstract
A resonator includes a balance spring formed in a single crystal quartz with crystallographic axes x, y, z, where the x axis is an electrical axis and the y axis is a mechanical axis, and cooperating with a balance. A thermal expansion coefficient of the balance is comprised between +6 ppm.° C.−1 and +9.9 ppm.° C.−1 and a cut angle of the balance spring to the z axis of the single crystal quartz is comprised between −5° and +5°, so as to match the balance to the balance spring.
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