Ink jet print head having dynamic impedance adjustment

Details Ink jet print head having dynamic impedance adjustment Ink jet print head having dynamic impedance adjustment

1979-09-24

1982-10-05

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

043530788

ABSTRACT:
A drop-on-demand ink jet printing apparatus in which the print head has an ink cavity which is filled with ink, and which has an orifice designed so that ink does not flow out under static conditions. A fluid inlet chamber is provided to receive ink from the ink supply and this chamber is separated from the ink cavity by a narrow gap. An electromechanical transducer is mounted adjacent the ink cavity and the inlet chamber. The transducer is selectively energized in response to the print data signals so that, when energized by an electrical signal, the transducer reduces the volume in the ink cavity to eject one ink drop from the orifice and substantially close off the narrow gap to substantially close the flow path from the ink cavity to the inlet chamber during the formation of the drop of ink.

REFERENCES:
patent: 3832579 (1974-08-01), Arndt
patent: 3848118 (1974-11-01), Rittberg
patent: 3852773 (1974-12-01), Sicking
patent: 3940773 (1976-02-01), Mizoguchi
patent: 3946398 (1976-03-01), Kyser
patent: 3988745 (1976-10-01), Sultan
patent: 4131899 (1978-12-01), Christon
patent: 4215354 (1980-07-01), Larsson
Denny et al.; Diaphragm Ink Drop Generator and Liquid Horn; IBM TDB, vol. 16, No. 3, Aug. 1973, pp. 789-791.
Lee et al.; High-Speed Droplet Generator; IBM Tech. Disc. Bulletin; vol. 15, No. 3, Aug. 1972, p. 909.
Meier, J. H.; Ink Jet Head; IBM Tech. Disc. Bulletin; vol. 16, No. 6, Nov. 1973, p. 1833.

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