Combined Leak and D(3,3) Piezoelectric Test
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
This article describes a testing procedure for cylindrical piezoelectric crystal tubes that sort the tubes according to electrical characteristics as well as testing their sealing properties. One method of constructing a drop-on-demand ink jet head uses cylindrical piezoelectric tubes to drive the individual channels. This method has many advantages but requires that the individual tubes in a head be matched to control the velocity of individual ink drops. Also, an individual fluid seal is required at each end of each tube. The tubes, made from a ceramic material, are coated as shown in the figure with a conductor material forming electrodes that permits electrical contact to be made to the inside and outside surfaces. Chips in the end sealing surfaces are the major cause of leaks.