Title: Spring, power spring, hair spring, driving mechanism utilizing them, and timepiece
Application Number: 98801241 Application Date: 1998.08.28
Publication Number: 1237250 Publication Date: 1999.12.01
Approval Pub. Date: 2005.04.06 Granted Pub. Date: 2005.04.06
International Classifi-cation: G04B1/10;G10F1/06
Applicant(s) Name: Seiko Epson Corp. Address:
Inventor(s) Name: Moteki Masatoshi;Takagi Fumio;Hara Tatsuo
Attorney & Agent: zhang tianan
Abstract:
    A power spring used as a power source of a driving mechanism, formed from an amorphous metal sheet having an S-shaped free expansion shape, wherein the point of inflection at which the direction of curving of the expansion shape changes is defined at a point toward an inner end from an intermediate point between the inner end as the end portion on the take-up side and an outer end as the other end with respect to the inner end. Because the amorphous metal has a high tensile stress and a low Young
Time: 8
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