Driving method of droplet ejection head

Details Driving method of droplet ejection head Driving method of droplet ejection head

2008-04-29

2008-04-29

Shah, Manish S. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S068000

Reexamination Certificate

active

07364274

ABSTRACT:
A driving method of a droplet ejection head having plural channels separated by sidewalls formed with piezoelectric material, the channels being divided into three groups; and an electric voltage pulse is applied to each of the groups sequentially in a time-sharing mode, and to generate a shear deformation of the sidewall, and liquid is ejected as a droplet from a nozzle, wherein applying process of the pulse includes: a first step for enlarging a volume of a channel; a second step for keeping the enlarged volume; a third step for reducing the volume; a fourth step for keeping the reduced volume; and a fifth step for enlarging the volume, wherein the third step starts when α/β≦⅓ is satisfied for the protruded pillar at an adjoining channel nozzle driven just before; where α denotes a width of the pillar, and β denotes a maximum width of the pillar.

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patent: 2-215537 (1990-08-01), None

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