Ink ejecting device

Details Ink ejecting device Ink ejecting device

2005-07-19

2005-07-19

Vo, Anh T.N. (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

06918660

ABSTRACT:
A first cavity plate formed with a first pressure chamber and a second cavity plate formed with a second pressure chamber are disposed on both sides of a piezoelectric actuator. A pressure generating portion is formed between opposed surfaces of the piezoelectric actuator. The first pressure chamber faces one of the opposed surfaces of the piezoelectric actuator while the second pressure chamber faces the other surface. The first and second pressure chambers communicate with each other via inner and outer holes that penetrate the piezoelectric actuator. The pressure generating portion is deformable to expand to shift the opposed surfaces of the piezoelectric actuator toward the first and second pressure chambers and reduce the volume of the first and second pressure chambers. As a result, an ink droplet is ejected from a nozzle that communicates with both the first and second pressure chambers. Because the deformation of the piezoelectric actuator on both sides thereof is effectively used to eject ink, a drive voltage for the pressure generating portion can be reduced.

REFERENCES:
patent: 5215446 (1993-06-01), Takahashi et al.
patent: 6284147 (2001-09-01), Silverbrook
patent: 6457818 (2002-10-01), Kurashima et al.
patent: 2001/0020968 (2001-09-01), Isono et al.
patent: 61137753 (1986-06-01), None
patent: 2001260347 (2001-09-01), None

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