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Combined Leak and D(3,3) Piezoelectric Test

IP.com Disclosure Number: IPCOM000039220D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Dattilo, AJ: AUTHOR [+2]

Abstract

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.

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Combined Leak and D(3,3) Piezoelectric Test

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. Since 100% inspection is required, an efficient method of leak detection is essential. A gas leak test is the best approach. A fixture to test several tubes using a commercially available USON pressure decay tester can be used. The test is conducted by sealing the ends of the tube and applying a positive gas pressure to the inside of the tubes. The pressure is monitored for a short time to detect leak failures. Testing several parts simultaneously provides a satisfactory throughput while being adequate to ensure the fluid seal required. Although there are several other methods for sorting the tubes into matched sets according to the electrica...