| 摘要 |
<p>A gap (h) between a rotor inertia plate (12c) and stators (123, 133) is set such that the load torque produced by air viscosity resistance between these parts is not more than 1/10 of the maximum output torque at the rotor. Therefore, the load torque is sufficiently reduced, making it possible to keep down the energy loss of the spring and prolong the duration of the timepiece.</p> |
