IC Packaging Technology for Electronic Watches

IC-Quartz watches have been manufactured since the appearance of CMOS-LSI about seven years ago. Nowadays, the outside view of the quartz watch is the same as that of a mechanical watch through minimizing electronic parts such as battery, crystal oscillator, capacitor, and IC packaging volume. Recently, IC packaging technology for electronic wrist watches (both the analog quartz watch and digital quartz watch) has made a step foward. In Japan, some watch makers adopt a film carrier assembly technique for producing thin and low-priced watches. They are using 3 layers and 35 mm wide film which fits very well the substrate of the quartz watch, especially the digital quartz watch.