Droplet ejection head driving method, droplet ejection head...

Details Droplet ejection head driving method, droplet ejection head... Droplet ejection head driving method, droplet ejection head...

2006-02-10

2008-10-14

Stephens, Juanita D (Department: 2853)

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C347S068000

Reexamination Certificate

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07434903

ABSTRACT:
A droplet ejection head driving method applies a driving voltage waveform to pressure-generating means, thus pressurizing a liquid in a pressure chamber and causing a droplet to be ejected. The driving voltage waveform includes a first voltage change process, which expands the pressure chamber, and a second voltage change process, after the first voltage change process, which shrinks the pressure chamber. A time interval between the first voltage change process and the second voltage change process is not more than ⅛ of a resonance period Tm of a meniscus oscillation (a refill oscillation), which is governed by surface tension of the liquid at a nozzle portion.

REFERENCES:
patent: 6962398 (2005-11-01), Okuda et al.

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