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METHOD TO REMOVE AIR BUBBLES

IP.com Disclosure Number: IPCOM000027127D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

An ink jet printhead 1, as illustrated in the Figure, contains a plurality of channels 2 (three of which are illustrated in dotted outline) coupled to an ink manifold 3 containing ink. The channels 2 each terminate in a nozzle 4 at the front face of the printhead. Each nozzle typically ejects ink under the influence of a heater 5 located beneath the channel 2. The heater 5 heats the ink in the channel 2 and causes an ink bubble to form which upon collapse ejects ink from the nozzle 4. Ink, however, can contain air bubbles which tend to collect in regions of the printhead where ink velocity in the ink path is low. If the air bubbles get to a critical size, ejection of ink from the nozzles 4 is interfered with or completely prevented. This phenomena is know as "drop-out". One such area is at the corners 6 of the ink manifold.

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XEROX DISCLOSURE JOURNAL

METHOD TO REMOVE AIR BUBBLES
E. Mariano Freire Dale R. Ims
Michael P. O'Horo

Proposed Classification

U.S. C1. GOlD 15/18 Int. C1.346/140R

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 3 May/June 1995 219

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METHOD TO REMOVE AIR BUBBLES (Cont'd)

An ink jet printhead 1, as illustrated in the Figure, contains a plurality of channels 2 (three of which are illustrated in dotted outline) coupled to an ink manifold 3 containing ink. The channels 2 each terminate in a nozzle 4 at the front face of the printhead. Each nozzle typically ejects ink under the influence of a heater 5 located beneath the channel 2. The heater 5 heats the ink in the channel 2 and causes an ink bubble to form which upon collapse ejects ink from the nozzle 4. Ink, however, can contain air bubbles which tend to collect in regions of the printhead where ink velocity in the ink path is low. If the air bubbles get to a critical size, ejection of ink from the nozzles 4 is interfered with or completely prevented. This phenomena is know as "drop-out". One such area is at the corners 6 of the ink manifold.

It is proposed to eliminate the air bubbles which collect in the corners 6 of the ink manifold during priming of an ink jet printhead by forming, at either end of the printhead, a first channel 7 and a second channel 8, each lacking a corresponding heater. The first channel 7 and the second channel 8 each termina...