Droplet ejecting head, method for driving the same, and...

Details Droplet ejecting head, method for driving the same, and... Droplet ejecting head, method for driving the same, and...

2005-02-08

2005-02-08

Nguyen, Lamson (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S047000

Reexamination Certificate

active

06851778

ABSTRACT:
A nozzle for ejecting a droplet has a straight portion having a substantially straight shape. A driving waveform to be applied to a piezoelectric actuator includes a first voltage change process for expanding volume of a pressure generating chamber to retract a meniscus of the nozzle portion toward the pressure generating chamber and a second voltage change process for compressing the volume of the pressure generating chamber to eject a droplet. Voltage change quantity and voltage change time of the first voltage change process are set so that meniscus retraction quantity D when the second voltage change process is applied satisfies 0.8·ln≦D≦1.5·ln(lndesignates length of the straight portion of the nozzle). Consequently, when the second voltage change process is applied, strong liquid surface interference can be produced in the nozzle central portion. Therefore, a droplet having an extremely small droplet volume can be ejected.

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