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Patent Searching and Data


Title:
SILICON HAIRSPRING
Document Type and Number:
WIPO Patent Application WO/2016/131377
Kind Code:
A1
Abstract:
A torque-restoring element(100) for an oscillator for a mechanical timepiece comprises a spiral spring body(110) having a number N turnings(170) with an inner terminal end(115) for engagement with a rotational inertial element via a collet(117), and an outer terminal end(125) for engagement with a stationary cock element, the said spiral spring body(110) having a width, a height and a total arc length includes a core(180a) formed from mono-crystalline silicon wafer oriented along the crystallographic axis <110>; and wherein the spiral spring body(110) includes at least one peripheral coating(190a) of a material having a thermal elastic constant different from that of the core(180a) of the spiral spring body(110) so as to maintain the oscillator frequency of an oscillator including the torque-restoring element(100) substantially insensitive to variations of ambient temperature.

Inventors:
CHING HO (CN)
KO PUI HANG (CN)
Application Number:
PCT/CN2016/072851
Publication Date:
August 25, 2016
Filing Date:
January 29, 2016
Export Citation:
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Assignee:
MASTER DYNAMIC LTD (CN)
International Classes:
G04B17/06; F16F1/10
Foreign References:
US20050281137A12005-12-22
US20100290320A12010-11-18
US20140219067A12014-08-07
CN104345628A2015-02-11
EP2755093A22014-07-16
US20110037537A12011-02-17
Attorney, Agent or Firm:
CHINA SINDA INTELLECTUAL PROPERTY LTD. (Focus Place 19 Financial Street,,Xicheng District, Beijing 3, CN)
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