Patent · US Active

Speed governor for timepiece

US10274897B2 · kind B2 · utility

0Cited by
3References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 1, 2016
Grant dateApr 30, 2019
Priority date—
Expiry dateJun 1, 2036

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG04B17/066
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A governor includes a balance spring including a base member made of silicon, for example, and a balance wheel. The balance spring includes a coating film of DLC that is applied to a surface of the silicon base member to improve the strength of the balance spring. A spring constant of the balance spring changes in accordance with the temperature change. A moment of inertia of the balance wheel changes in accordance with the temperature change. A change in an oscillation period due to the temperature change is suppressed by the change in the spring constant of the balance spring and by the change in the moment of inertia of the balance wheel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.