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Ink Jet Drop Size Modulation

IP.com Disclosure Number: IPCOM000084636D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Lennemann, E: AUTHOR [+2]

Abstract

Multinozzle ink jet head 1 (Fig. 1) produces the nominal large drop, utilizing a drop on demand actuator. The head 1 is subjected to sinusoidal vibration 2 in the direction of drop propagation. The phase relationship between the basic sine vibration and the drop on demand pulse determines the size of the drop ejected, since when head 1 is withdrawn, the friction between the ink column and the walls of nozzle 3 causes a quantity of ink to be removed from the column, so that the effective column of the ejected drop 4 is reduced.

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Ink Jet Drop Size Modulation

Multinozzle ink jet head 1 (Fig. 1) produces the nominal large drop, utilizing a drop on demand actuator. The head 1 is subjected to sinusoidal vibration 2 in the direction of drop propagation. The phase relationship between the basic sine vibration and the drop on demand pulse determines the size of the drop ejected, since when head 1 is withdrawn, the friction between the ink column and the walls of nozzle 3 causes a quantity of ink to be removed from the column, so that the effective column of the ejected drop 4 is reduced.

A diagram (Fig. 2) shows the basic vibration of head 1 and different timings of the pulse to eject drops 4a - 4d.

A physical interpretation of the relationship between phase and drop size is given in curves 5, 6, 7 (Fig. 3). The resulting excitation of the ink column is approximated to a triangular wave form 8. The lower forward velocity produces smaller drops 4 than a higher forward velocity.

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