Browse Prior Art Database

Resonance Scrambler for Ink Jet Heads

IP.com Disclosure Number: IPCOM000083280D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Lane, R: AUTHOR [+2]

Abstract

Drop placement accuracy in a multinozzle ink jet printer depends on, among other things, uniformity of breakoff distances across the array. Nonuniformities may be caused by resonances of the piezoelectric drivers, among other things.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 2

Resonance Scrambler for Ink Jet Heads

Drop placement accuracy in a multinozzle ink jet printer depends on, among other things, uniformity of breakoff distances across the array. Nonuniformities may be caused by resonances of the piezoelectric drivers, among other things.

Various types of piezoelectric drivers are available, some of which are plates and some thicker masses. Each driver exhibits resonances at certain frequencies, which are related to the geometry and material properties of the driver.

A standard driver, for example, consists of a thin piezoelectric unimorph ceramic 2 bonded to a brass plate 4.

Ignoring resonances of the head itself, a node in the driver resonance corresponds to a zero pressure perturbation at the nozzle plane in some localized region, which leads to a sharp increase in the distance to breakoff for nozzles in that region. While many resonances result in breakoff nonuniformities of only a few wavelengths, extreme cases of nonuniformity are not uncommon.

In order to eliminate the strong effects of driver resonances, it is possible to insert in the head a means of scattering the propagating pressure wave, so as to average out or scramble the resonant nodes of the piezoelectric plate before they reach the nozzles. Thus, any nozzle which would otherwise receive no perturbation because its position corresponded to a node of the driver, would now have a pressure perturbation contribution from other areas of the driver.

The simplest method...