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DROPLET GENERATOR WITH RETAINED APERTURE PLATE

IP.com Disclosure Number: IPCOM000025656D
Original Publication Date: 1987-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 112K

Publishing Venue

Xerox Disclosure Journal

Abstract

In continuous stream type ink jet printheads, the droplet generator generally comprises a housing having a predetermined internal acoustic cavity maintained full of pressurized ink, a pressure wave generator such as a piezoelectric driver to perturbate the ink in the cavity at a certain frequency, and an aperture plate with one or more apertures or nozzles therein through which the ink streams flow. Perturbation of the ink in the cavity causes it to break up at a fixed distance from the nozzles, whereat the droplets are uniquely charged in accordance with digitized data signals, so that their trajectories through an electrostatic field cause the droplets to impact a recording medium at specific pixel locations.

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XEROX DISCLOSURE JOURNAL

DROPLET GENERATOR WITH Proposed Classification RETAINED APERTURE PLATE
Kenneth V. Cadogan

US. Cl. 346/75

Int. C1. Gold 15/18

24

30

ARBITRARY

FIG. I

/4

FIG. 2

Volume 12 Number 1 January/February 1987 17

[This page contains 1 picture or other non-text object]

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DROPLET GENERATOR WITH RETAINED APERTURE PLATE

(Cont'd)

In continuous stream type ink jet printheads, the droplet generator generally comprises a housing having a predetermined internal acoustic cavity maintained full of pressurized ink, a pressure wave generator such as a piezoelectric driver to perturbate the ink in the cavity at a certain frequency, and an aperture plate with one or more apertures or nozzles therein through which the ink streams flow. Perturbation of the ink in the cavity causes it to break up at a fixed distance from the nozzles, whereat the droplets are uniquely charged in accordance with digitized data signals, so that their trajectories through an electrostatic field cause the droplets to impact a recording medium at specific pixel locations.

In some droplet generator designs, the aperture plates are bonded thereto. There have been some bonding problems with bonded aperture plates. One major problem is that the bonding gives way over a given period of time. Studies have been undertaken to eradicate this problem because of the advantages a bonded aperture plate offers. One major advantage is that the pertinent operating windows relative to breakoff length and satellite merge conditions are not restricted.

A retained design which secures the aperture plate permanently has drawbacks in the areas of the above-mentioned advantages....