Spring, power spring, hair spring, driving mechanism utilizing them, and timepiece
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United States of America Patent
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Jan 18, 2005
Grant Date -
N/A
app pub date -
Apr 28, 1999
filing date -
Aug 28, 1997
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Abstract
A mainspring used as a power source for a driving mechanism is made of an amorphous metal sheet, and has an S-shaped free-exploded shape. The curvature changing point where the curving direction of the free-exploded shape changes is formed on the inner end side of a middle point between the inner end on the winding side and the outer end serving as the other end of the inner end. Because of the high tensile stress and a low Young's modulus, the amorphous metal permits increase in mechanical energy stored in the mainspring.
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