TRACKBALL DEVICE FOR CONTROLLING AN ELECTRONIC APPARATUS, AND PRODUCTION PROCESS

摘要

A tracker ball is in contact with the drum of a longitudinal shaft and also the drum (42T) of a transverse shaft (32T). The shaft has a toothed coding pinion (44T) which engages with a contact rod (70T) formed from the end of a coil spring (50T). The coil spring lies in a trough (46T) and the the end remote from the coding pinion is anchored by welding using two electrodes (E1,E2) An Independent claim is also included for : A method of fixing a metallic component such as a spring in a trough within a plastic case by thermowelding