Incremental printing of symbolic information – Ink jet – Controller
Patent
1993-06-11
1996-07-30
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
347 14, 347 27, 347 70, B41J 2045
Patent
active
055416284
ABSTRACT:
Disclosed is an ink-jet type recording device that includes drive signal generation circuit 84 for generating a trapezoidal drive signal in synchronization with a timing signal applied from an external device, switching transistors respectively for outputting a drive signal to piezoelectric vibrators in accordance with a printing signal applied from an external device, and control signal generation means for generating a pulse signal to turn on the switching transistors so that only a portion of the drive signal is output to any piezoelectric vibrators set in a non-printing condition in synchronization with a timing signal. This portion of the drive signal is applied to the piezoelectric vibrators belonging to those nozzle openings that should not jet out ink droplets in accordance with the pulse signal, so that menisci in the nozzle openings are merely vibrated slightly, respectively. As a result of this, ink existing in a pressure generation chamber and ink existing in the neighborhood of the nozzle openings are mixed together and thus solvent is supplemented to the ink existing in the neighborhood of the nozzle opening, thereby preventing formation of an ink film due to evaporation of the solvent. Also, even in the non-printing period, the piezoelectric vibrators respectively generate heat to thereby be able to prevent absorption of humidity from the peripheral environment.
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Moss, J. D., "Noncontinuous Dither Excitation of Drop-On-Demand Ink Jet Printer"; IBM Tech. Disc. Bulletin; vol. 27, No. 1B Jun. 1984, pp. 837-838.
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Chang Junhua
Kanbayashi Kenichi
Nakamura Haruo
Niimura Hiroe
Saruta Toshihisa
Bobb Alrick
Fuller Benjamin R.
Seiko Epson Corporation
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