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

B - Operations, Transporting

41

J

101/96.0217

B41J 2/045 (2006.01)

Patent

CA 1156706

INK JET PRINT HEAD HAVING DYNAMIC IMPEDANCE ADJUSTMENT 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 elec- trical 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 sub- stantially close the flow path from the ink cavity to the inlet chamber during the formation of the drop of ink. SA979006

356124

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