EP 3100120 A1 20161207 - THERMALLY COMPENSATED HAIRSPRING MADE FROM CERAMIC COMPRISING SILICON IN THE COMPOSITION OF SAME AND METHOD FOR ADJUSTING SAME
Title (en)
THERMALLY COMPENSATED HAIRSPRING MADE FROM CERAMIC COMPRISING SILICON IN THE COMPOSITION OF SAME AND METHOD FOR ADJUSTING SAME
Title (de)
WÄRMEKOMPENSIERTE SPIRALFEDER AUS KERAMIK MIT SILICIUM IN DER ZUSAMMENSETZUNG DAVON UND VERFAHREN ZU ANPASSUNG DAVON
Title (fr)
RESSORT SPIRAL THERMOCOMPENSÉ EN CÉRAMIQUE COMPRENANT L' ÉLÉMENT SILICIUM DANS SA COMPOSITION ET SON PROCÉDÉ DE RÉGLAGE
Publication
Application
Priority
- CH 1192014 A 20140129
- EP 2015051618 W 20150127
Abstract (en)
[origin: WO2015113973A1] The invention concerns a hairspring (1) intended to equip a balance-hairspring resonator of a movement of a timepiece or another precision instrument, the hairspring (1) comprising a core (2) made from a ceramic material comprising silicon in the core of same and comprising a cross-section, the core (2) having a first stiffness (k A) and a first thermoelastic coefficient (β A); and a coating (4) made from silicon dioxide of thickness (t R) and at least partially covering the core (2), the coating (4) having a second thickness (k R ) and a second thermoelastic coefficient (β R) of opposite sign to the first thermoelastic coefficient (β A); in which the cross-section of the core (2) and the thickness (t R) of the coating (4) can be adjusted separately in such a way as to obtain a desired value for the thermoelastic coefficient of the hairspring (β <o>S</o>) and a thickness of the hairspring (k S). The invention also concerns a balance-hairspring resonator comprising the hairspring and a balance wheel and a method for adjusting the hairspring. The hairspring has invariant expansion and elasticity properties.
IPC 8 full level
G04B 17/22 (2006.01); G04B 17/06 (2006.01)
CPC (source: EP)
G04B 17/066 (2013.01); G04B 17/22 (2013.01)
Citation (examination)
US 2011292770 A1 20111201 - DAMASKO KONRAD [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2015113973 A1 20150806; CN 106104393 A 20161109; EP 3100120 A1 20161207; EP 3958066 A1 20220223; EP 3958066 B1 20240724
DOCDB simple family (application)
EP 2015051618 W 20150127; CN 201580006293 A 20150127; EP 15701046 A 20150127; EP 21194853 A 20150127