Hairspring for balance wheel hairspring resonator and production method thereof
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United States of America Patent
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Issued Date -
Mar 16, 2006
app pub date -
Feb 2, 2004
filing date -
Feb 6, 2003
priority date (Note) -
Abandoned
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Abstract
The spiral includes turns of rectangular section, whose pitch p and/or thickness e can vary from the inside curve towards the outside curve, or whose winding can deviate from the line of a perfect spiral. The inside curve can also be extended by a self-locking washer for fixing the spiral on the balance arbour with no play. The spiral is manufactured by photolithography and galvanic growth, or by micro-machining an amorphous or crystalline material such as a silicon wafer.
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