| 摘要 |
PROBLEM TO BE SOLVED: To provide a balance wheel, a watch movement, a watch, and a method for manufacturing the balance wheel capable of improving machining accuracy as a structure enabled to select various metals, capable of being hardly affected by magnetism, and capable of stably reducing the temperature dependency of a vibration frequency.SOLUTION: A rim part 25 of a balance wheel 21 is formed by stacking a low thermal expansive metal plate 27 arranged on the inner peripheral side and a high thermal expansive metal plate 28 arranged on the outer peripheral side, and an uncross part 26 of the balance wheel 21 is configured by an approximately circular-arc first arm part 31 and second arm part 32 formed by stacking a high thermal expansive metal plate 33 arranged on the inner peripheral surface side and a low thermal expansive metal plate 34 arranged on the outer peripheral surface side. |
