| 摘要 |
PROBLEM TO BE SOLVED: To provide a weight for a watch in the simple balance ring shape to be provided to a balance wheel for watch speed control so that an inertia moment is set to desired adjustment width.SOLUTION: A weight 300 for a watch is provided to a balance wheel 200 for watch speed control, adjusts an inertia moment of the balance wheel, and has a trunk 301 which is rotatably provided centering on an axis to be provided to the balance wheel, in which the trunk has: a lower surface 307 which crosses the axis to be provided to the balance wheel; and an upper surface 306 which determines thickness in a direction of the axis to be provided to the balance wheel between it and the lower surface. A thickness on one side and a thickness on the other side in a radial direction of the axis 215 to be provided to the balance wheel are different from each other. |
