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Droplet ejecting head, method for driving the same, and droplet ejecting apparatus

  • US 20030122889A1
  • Filed: 12/03/2002
  • Published: 07/03/2003
  • Est. Priority Date: 12/03/2001
  • Status: Active Grant
First Claim
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1. A method for driving a droplet ejecting head including:

  • a nozzle having a straight portion formed into a substantially straight shape with a small taper angle;

    a pressure generating chamber communicating with the nozzle; and

    an electromechanical transducer, the method comprising the steps of;

    applying a driving voltage to the electromechanical transducer;

    deforming the electromechanical transducer;

    producing pressure change in the pressure generating chamber filled with liquid; and

    ejecting a droplet from the nozzle, wherein a voltage waveform of the driving voltage includes;

    a first voltage change process for expanding volume of the pressure generating chamber to retract a meniscus in the nozzle toward the pressure generating chamber; and

    a second voltage change process for compressing the volume of the pressure generating chamber to eject the droplet; and

    wherein voltage change quantity and voltage change time of the first voltage change process are set so that retraction quantity D of the meniscus at a time when the second voltage change process is applied satisfies;

    0.8·

    l
    n

    D≦

    1.5·

    l
    n where ln designates length of the straight portion.

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