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Temperature Compensation for Drop on Demand Drop Velocity

IP.com Disclosure Number: IPCOM000040599D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Drago, GA: AUTHOR [+2]

Abstract

This article describes a drop-velocity compensation method for drop-on- demand (DOD) ink jet printing that minimizes the effect of temperature on print quality. Pulse height of the driving waveform is varied as a function of the printhead temperature to maintain the mean velocity of one or more nozzles within the velocity range that produces acceptable print quality. The compensation method is easily implemented in analog or digital electronics. Print quality in DOD printheads is directly related to drop velocity. In particular, drop placement on the paper, drop formation characteristics, and drop size are directly related to drop velocity. Drop placement is the most critical of these attributes. Differences in drop arrival times from an array of nozzles are increased by a reduction in the mean velocity of the array.

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Temperature Compensation for Drop on Demand Drop Velocity

This article describes a drop-velocity compensation method for drop-on- demand (DOD) ink jet printing that minimizes the effect of temperature on print quality. Pulse height of the driving waveform is varied as a function of the printhead temperature to maintain the mean velocity of one or more nozzles within the velocity range that produces acceptable print quality. The compensation method is easily implemented in analog or digital electronics. Print quality in DOD printheads is directly related to drop velocity. In particular, drop placement on the paper, drop formation characteristics, and drop size are directly related to drop velocity. Drop placement is the most critical of these attributes. Differences in drop arrival times from an array of nozzles are increased by a reduction in the mean velocity of the array. For a multi-nozzle, translating printhead, mean drop velocity must be maintained above a minimum velocity consistent with acceptable drop placement. For bidirectional printing, mean velocity must be controlled for proper alignment of dots printed on successive passes of the printhead.

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Acceptable drop formation and drop volume impose additional requirements on the mean velocity of drops from an array of nozzles. The mean velocity must be maintained within a limited range, keeping the highest and lowest velocities within a velocity window for acceptable printing. Drop velocity is strongly dependent upon nozzle flow resistance, the latter being greatly af...