| 摘要 |
PURPOSE:To increase the shock proof of motor and to increase the reliability, by adopting unit system through the containment of the components of the step motor into a unit case and directly coupling the pointer corresponding to the minimum time unit to the motor shaft. CONSTITUTION:In the step motor 15, the rotor 15a, stators 15b and coil 15c constituting it, are contained in the motor case 15d of almost the same external shape as the inner diameter of the watch case and of thin cylindrical shape having the concave 15f at the center upper surface to constitute unit shape. Further, the lower end of the motor shaft 15e fixed to the rotation center of the rotor 15a is supported with the bearing 15g of the case 15d, and it is extended upward via the bearing 15h, and at the tip, the second or minute pointer corresponding to the minimum time unit is directly coupled. Thus, the shock proof of the step motor is increased and the reliability of watches can be increased. |
