Temperature compensation-type balance with hairspring, movement, and timepiece

Abstract

To provide a temperature compensation-type balance with hairspring capable of reducing deformation of a bimetal portion and improving temperature compensation performance. A temperature compensation-type balance with hairspring includes a balance with hairspring main body, adjustment portions, and a regulation portion. The balance with hairspring main body includes a balance staff extending along a first axis and rotates around the first axis. The adjustment portions are supported as a cantilever along the second axis from rotationally symmetrical positions around the first axis in the balance with hairspring main body, each of the adjustment portions including a bimetal portion in which materials having different thermal expansion coefficients are stacked in a direction intersecting the second axis. The regulation portion is provided at a position corresponding to a free end of the adjustment portion and regulates movement of the adjustment portion with a gap of 0 mm or more relative to a movement range of the bimetal portion at a use temperature.

Dependencies are inferred from the claim text.