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COMPENSATION OF SUBUNIT PRINT DENSITY VARIATION IN A FULL WIDTH THERMAL INK JET PRINTBAR

IP.com Disclosure Number: IPCOM000027125D
Original Publication Date: 1995-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present proposal addresses a method for enhancing the print quality of a thermal ink jet printbar. A means is provided for varying the print density of each die subunit. Often there is a significant print density variation among dies from the same wafer pair. The variation is controlled by power compensation to each printbar die in accordance with an average wafer drop size. Dies yielding light print density receive extra power so as to increase the average drop size. By individually tailoring power to each die, a uniform print density exists across the printbar.

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XEROX DISCLOSURE JOURNAL

COMPENSATION OF SUBUNIT Proposed Classification PRINT DENSITY VARIATION IN A
FULL WIDTH THERMAL INK JET
PRINTBAR
Donald J. Drake
Stephen F. Pond
Bobbie A. Rice

U.S. C1.346113 Int. C1. Gold 09/00

The present proposal addresses a method for enhancing the print quality of a thermal ink jet printbar. A means is provided for varying the print density of each die subunit. Often there is a significant print density variation among dies from the same wafer pair. The variation is controlled by power compensation to each printbar die in accordance with an average wafer drop size. Dies yielding light print density receive extra power so as to increase the average drop size. By individually tailoring power to each die, a uniform print density exists across the printbar.

Print die power is controlled by a plurality of methodologies including: varying the width of an Enable logic pulse to each die so as to control the width of a pulse to a transducer; varying a supply voltage to each die; adding precursor burn pulses that inject energy to the ink on the transducer without causing bubble nucleation, or adjusting or selecting a resistance value on a die which, inturn, changes the voltage drop across the transducer. Different length precursor pulses add energy to the ink causing stored energy and viscosity changes that translate into drop volume changes.

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 3 May/June 1995 215

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