EP 1258786 B1 20080220 - Self-compensating spring for a mechanical oscillator of balance-spring type
Title (en)
Self-compensating spring for a mechanical oscillator of balance-spring type
Title (de)
Selbstkompensierende Feder für einen mechanischen Oszillator vom Unruh-Spiralfeder-Typ
Title (fr)
Spiral auto-compensateur pour oscillateur mécanique balancier-spiral
Publication
Application
Priority
EP 01810497 A 20010518
Abstract (en)
[origin: EP1258786A1] A self-balancing spring for a mechanical balance spring oscillator of a watch movement or other precision instrument, in a paramagnetic Nb-Hf alloy has a thermal coefficient of Youngs modulus (CTE) such that it essentially allows the annulment of the following expression: 1/E asterisk dE/dT+3 alpha s-2 alpha b where: E : Youngs modulus for the spring of the oscillator 1/E asterisk dE/dT = CTE = thermal coefficient of Youngs modulus of the oscillator spring alpha s : coefficient of thermal dilation of the oscillator spring alpha b : coefficient of dilation of the balance wheel of the oscillator. The alloy contains between 2% and 30% atomic of Hf.
IPC 8 full level
G04B 17/22 (2006.01); C22C 27/02 (2006.01)
CPC (source: EP US)
C22C 27/02 (2013.01 - EP US); G04B 17/066 (2013.01 - EP); G04B 17/227 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 1258786 A1 20021120; EP 1258786 B1 20080220; DE 1258786 T1 20030814; DE 60132878 D1 20080403; DE 60132878 T2 20090326; JP 2003004866 A 20030108; JP 2010044090 A 20100225; JP 4813742 B2 20111109; US 2002180130 A1 20021205; US 6705601 B2 20040316
DOCDB simple family (application)
EP 01810497 A 20010518; DE 01810497 T 20010518; DE 60132878 T 20010518; JP 2002142837 A 20020517; JP 2009254944 A 20091106; US 13952602 A 20020506