Viscosity switched ink jet

Recorders – Markers and/or driving means therefor – With ink supply to marker

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Details

G01D 1516

Patent

active

046600582

ABSTRACT:
In impulse ink jet printing, the method of, and apparatus for, controlling the projection of ink fluid droplets towards a printing surface by controlling the viscosity of the printing fluid at an orifice. An entire array of orifices can thereby be driven by a single pump mechanism. In one embodiment, the printing fluid used may have a liquid crystal polymer in suspension. Electrical fields can be selectively induced, in one instance, to so orient the crystals as to allow droplets to be projected through the orifice and, in another instance, to so orient the crystals as to prevent droplets from being projected. In another embodiment, heaters are provided at the orifice to heat the fluid sufficiently to allow droplets to be projected and a heat sink adequate to cool the fluid when the heater is turned off to prevent the projection of droplets.

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