JPS5796284A - Case construction for portable watch with alarm device - Google Patents

Abstract

PURPOSE:To eliminate generation of voltage in the coil spring due to vibration by fixing the movement between the drum and the upper flat face of the rear lid in a wat that connects the piezo-electric element that is attached to the rear lid and the movement with a coil. CONSTITUTION:A movement 5 is provided radially with protrusion 5d round all the circumference that give very small gap for the machine diameter of the drum 1. The movement 5 is vertically fixed by pressing down the upper face of the movement 5 with the lower face 1a of the inner protrusion of the drum and pushing up the lower face 5e of the outer movement periphery with the upper face 3a of the screw section on the rear lid 3. The outer circumferential protrusions 5d of the movement 5 are further provided with protrusions 5f at several positions to give tightening allowance to the machine diameter of the drum 1 and fix the radial direction of the movement. When the watch receives shock, its movement 5 is not vibrated, and no voltage is, therefore, developed in the coil spring 7 that connects the movement 5 and a piezo-electric element 4.