SPIRAL SPRING FOR A SPRUNG BALANCE SPIRAL RESONATOR AND METHOD FOR MANUFACTURING THE SAME
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United States of America Patent
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Apr 8, 2015
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Feb 6, 2003
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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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