Volumetrically efficient ink jet pen capable of extreme altitude

Details Volumetrically efficient ink jet pen capable of extreme altitude Volumetrically efficient ink jet pen capable of extreme altitude

1988-12-16

1990-04-24

Reynolds, Bruce A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346 75, G01D 1518

Patent

active

049203622

ABSTRACT:
An ink jet pen having a drop generator, a catchbasin and a plurality of interconnected ink chambers comprises an ink reservoir coupled therebetween. The ink is distributed among the chambers so that, at any given time, only one contains both air and ink. The others contain either all ink or all air. Consequently, environmental excursions that cause expansion of air in the reservoir act to drive ink from only one of the chambers to the catchbasin. (The other chambers either have no air that can expand or no ink that can be driven therefrom.) The pen can thus be constructed with a smaller catchbasin than prior art pens, thereby increasing its volumetric efficiency. The catchbasin size can be reduced to an arbitrarily small volume by segregating the ink reservoir into an correspondingly large number of commensurately small chambers.

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Hewlett-Packard Journal, May, 1985, pp. 1-27.

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