EP 2703910 B1 20190508 - Paired balance wheel - hairspring resonator
Title (en)
Paired balance wheel - hairspring resonator
Title (de)
Gepaarter Unruh-Spiralfeder-Resonator
Title (fr)
Résonateur balancier - spiral appairé
Publication
Application
Priority
- EP 12182973 A 20120904
- EP 13179958 A 20130809
Abstract (en)
[origin: EP2703909A1] The resonator (1) has a balance spring (5) formed in a single crystal quartz with three crystallographic axes, where the first and second axes are electrical axis and mechanical axis, respectively. The thermal expansion coefficient of a balance (3) lies between + 6 part per million degree Celsius -1 and + 9.9 part per million degree Celsius -1. Cut angle ranging between - 5 degree and + 5 degree is formed between the balance spring and the third axis of the single crystal quartz such that the resonator is less sensitive to temperature variation. A portion of the balance is made of titanium, platinum or durimphy.
IPC 8 full level
G04B 17/06 (2006.01)
CPC (source: CH EP RU US)
G04B 17/063 (2013.01 - EP US); G04B 17/066 (2013.01 - EP US); G04B 17/20 (2013.01 - CH); G04C 3/04 (2013.01 - US); G04B 17/22 (2013.01 - RU)
Citation (examination)
US 2010034057 A1 20100211 - LEVINGSTON GIDEON [FR]
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
DOCDB simple family (publication)
EP 2703909 A1 20140305; CN 103676600 A 20140326; CN 103676600 B 20160907; EP 2703910 A2 20140305; EP 2703910 A3 20140514; EP 2703910 B1 20190508; JP 2014052374 A 20140320; JP 6328392 B2 20180523; RU 2013140777 A 20150310; RU 2643195 C2 20180131; US 2014064044 A1 20140306; US 9030920 B2 20150512
DOCDB simple family (application)
EP 12182973 A 20120904; CN 201310397316 A 20130904; EP 13179958 A 20130809; JP 2013182787 A 20130904; RU 2013140777 A 20130903; US 201314011892 A 20130828