Method and apparatus for gray scale printing with a thermal ink

Details Method and apparatus for gray scale printing with a thermal ink Method and apparatus for gray scale printing with a thermal ink

1989-10-04

1991-01-01

Miller, Jr., George H.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, G01D 1518

Patent

active

049821997

ABSTRACT:
The firing resistor in a thermal ink jet pen is driven by two signals in sequence. The first signal is a warming signal, tailored to transfer a desired quantity of thermal energy to the ink in the firing nozzle. The second signal is a firing pulse tailored to vaporize ink adjacent the resistor and thereby eject a bubble of ink from the nozzle. The prewarming of the ink achieved by the warming pulse increases the volume of the vapor bubble produced by the firing pulse, thereby yielding a commensurately larger ink droplet. By varying the degree of prewarming, the droplets ejected by the firing pulse can be varied in volume, thereby effecting gray scale printing.

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Durbeck, Robert C. et al., "Ink Jet Printing", Output Hardcopy Devices, Academic Press, Inc., 1988., Chapter 13, pp. 311-370.

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