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Patent Searching and Data


Title:
SPEED GOVERNOR OF TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2016/203953
Kind Code:
A1
Abstract:
This speed governor of a timepiece prevents or suppresses reduction in precision of clock rate due to temperature change while suppressing the cost and improving the strength of a hairspring. A speed governor (10) is provided with: a hairspring (1) the base material of which is made of silicon, for example; and a balance wheel (2). The hairspring (1) is provided with, on the surface of the silicon base material, a coating film of DLC which improves the strength thereof. The spring constant of the hairspring (1) changes in accordance with temperature change. The moment of inertia of the balance wheel (2) changes in accordance with the temperature change. The change in the spring constant of the hairspring (1) and the change in the moment of inertia of the balance wheel (2) suppress change in the oscillation cycle due to temperature change.

Inventors:
IKEDA, Tomoo (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
NIIDA, Yusaku (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
ABE, Yosuke (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
Application Number:
JP2016/066198
Publication Date:
December 22, 2016
Filing Date:
June 01, 2016
Export Citation:
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Assignee:
CITIZEN WATCH CO., LTD. (1-12, Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
International Classes:
G04B17/22; G04B17/06
Foreign References:
JP2013170940A2013-09-02
JP2013195297A2013-09-30
JP2007256290A2007-10-04
US20100034057A12010-02-11
US20130135974A12013-05-30
Attorney, Agent or Firm:
CREO LAW & INTELLECTUAL PROPERTY (Tokyo Tatemono Yaesu Bldg. 2F, 4-16 Yaesu 1-chome, Chuo-k, Tokyo 28, 〒1030028, JP)
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