JPS5750680A - Movement structure of small size hand display type electronic wristwatch - Google Patents

Abstract

PURPOSE:To provide a titled structure of outstanding space efficiency by forming step bent parts in both end parts of the magnetic core of the coil of a step motor, and joining and fixing said parts to a stator. CONSTITUTION:The stator 27 and coil 23 of a step motor 6 are disposed in a manner as to be stacked within the same plane space, and step bent parts 24a extending in the battery direction along the long diameter direction of the watch movement from both ends of the winding part of the coil 23 are provided to the magnetic core 24 of the coil by effectively using the dead space created inevitably by the outside shape of the movement and the planar disposition relation of the battery 5 and the coil 23 with each other. Since the step motor is screwed and fixed in superposition with the stator 27 by these parts 24a, the plane size of the step motor 5 is made sufficiently small in size without sacrifying the size of the watch movement and the length of the coil, and nevertheless by directly and magnetically coupling the core 24 and the stator 27 without causing degradation in electromechanical conversion efficiency.