PRINTER HEADS FOR MOSAIC PRINTER UNITS

摘要

A mosaic printing head has cast therein a number of hollowcylindrical piezoelectrically operated drive elements, each of which surrounds a respective ink-jet passage in the head. Arranged between the inner wall of each drive element and its respective passage is a layer of material which is impervious to the ink used. Embedded in this layer is a metal spiral which forms one of the two electrodes required to connect the drive element to a source of electrical energy. The metal spiral resiliently engages the internal surface of the piezoelectric element and during casting serves to locate the element concentrically relative to the passage.