Drop-on-demand method and apparatus using converging nozzles and

Details Drop-on-demand method and apparatus using converging nozzles and Drop-on-demand method and apparatus using converging nozzles and

1983-03-04

1984-10-02

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

106 20, 346140R, G01D 1518

Patent

active

044751133

ABSTRACT:
A drop-on-demand ink jet printing method and apparatus in which the print head has an ink cavity which is filled with ink, and which has a nozzle designed so that ink does not flow out under static conditions. An electromechanical transducer is selectively energized in response to print data signals so that, when energized by an electrical signal, the transducer produces a pressure wave in the ink cavity sufficient to eject one ink drop from the nozzle for each signal above a threshold value. The nozzle is a strongly convergent nozzle and the ink has a viscosity up to 100 centipoise. In the preferred embodiment, the nozzle is formed by anisotropic etching in a silicon substrate. An array of print heads produces a line of high-resolution printing as the print head array is moved across a print medium.

REFERENCES:
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patent: 3946398 (1976-03-01), Kyser
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Pelkie et al., Ink Jet Head; IBM TDB vol. 20, No. 2, Jul. 1977, pp. 553-554.
Welch et al., High Viscosity Drop-on-Demand Inks, IBM TDB, vol. 24, No 7B, Dec. 1981, pp. 3944-3945.

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