Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1997-10-09
1999-11-16
Le, N.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 205
Patent
active
059844574
ABSTRACT:
A thermal inkjet printer is operated in a spray-mode by deliberately firing ink droplets from a printhead while the meniscus of the remaining ink in the printhead is settling down. Generally, the drops will not travel in a direction perpendicular to the printing surface. By calibrating the printhead, one can determine how many drops are needed to be fired within the boundaries of a pixel to achieve any given optical density. Drops may be fired at rates above 50 kHz, and, depending on the ink, above 70 kHz. Ink with a viscosity of 10 centi-Poise or less, and even 2 centi-Poise or less, may be used. When one is printing both text and non-text images on the same surface, a digital representation of an image to be printed is analyzed and divided into non-text image fields and text fields. Each non-text image field is printed on the printing surface by projecting the corresponding ink droplets in the spray-mode. Each text field is printed on the printing surface in a text-mode, in which the firing rate is typically reduced to 5-10 kHz and the corresponding ink droplets are projected substantially perpendicular to the printing surface.
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W. A. Buskirk, D.E. Hackleman, S.T. Hall, P.H. Kanarek, R.N. Low, K.E. Trueba and R.R. Van de Poll, "Development of a High-Resolution Thermal Inkjet Printhead", Hewlett Packard Journal, Oct. 1988, pp. 55-61.
Meyer John D.
Taub Howard H.
Anderson L.
Hewlett--Packard Company
Le N.
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