Browse Prior Art Database

Method to Detect "In Situ" Defects in Nozzles in Ink Jet Printers

IP.com Disclosure Number: IPCOM000053030D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ikoma, T: AUTHOR

Abstract

In ink jet printing, silicon nozzles, which are vibrated periodically by ultrasonic excitation, are used to produce continuous streams of ink droplets. Because of stress concentrations, microcracks and fractures are generated near the orifices in SiO films and silicon nozzles during excitation. These defects cause severe deterioration of nozzle performance and eventually induce a fatal failure of an ink jet printer.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 68% of the total text.

Page 1 of 1

Method to Detect "In Situ" Defects in Nozzles in Ink Jet Printers

In ink jet printing, silicon nozzles, which are vibrated periodically by ultrasonic excitation, are used to produce continuous streams of ink droplets. Because of stress concentrations, microcracks and fractures are generated near the orifices in SiO films and silicon nozzles during excitation. These defects cause severe deterioration of nozzle performance and eventually induce a fatal failure of an ink jet printer.

A method to detect "in situ" formation of such defects in nozzles at very early stages is provided so that an early warning can be provided for the replacement of the nozzles to prevent a fatal failure of an ink jet printer.

The method is as follows. An acousto-electric transducer is situated at a place where acoustic waves can propagate from the nozzles in an ink jet printer. The output signals from the transducer are amplified and monitored. Since microcracks and fractures in SiO films and silicon nozzles emit acoustic pulses, formation of such detects can be detected by examining acoustic signals. When monitored acoustic signals exceed a critical value which has been pre-set, a warning is provided to inform nozzles emit acoustic pulses, formation of such detects can be detected by examining acoustic signals. When monitored acoustic signals exceed a critical value which has been pre-set, a warning is provided to inform of the generation of defects and to indicate replacement of the no...