SPIRAL SPRING AND METHOD FOR PRODUCING THE SPIRAL SPRING

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A spiral spring (100) capable of being mechanically coupled to a balance, comprising at least one leaf (102) wound in the shape of a spiral, the leaf (102) comprising at least one of the following materials : rare earth aluminate garnet, alexandrite, langasite, langatate, spinel, sapphire, fluorine, YLF, and in which the leaf (102) has a height h of between 100 μm and 150 μm, a width e of between 30 μm and 50 μm, and a spacing p between two neighbouring coils of the spiral spring (100) of between 150 μm and 250 μm.