Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1998-07-17
2001-04-17
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06217154
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an electrode for a printer employing technology the same as or similar to that described in WO-A-93-11866, PCT/GB95/01215 and WO-A-94-18011.
In order to achieve effective ejection from apparatus of this type, it is desirable that the carrier or support liquid containing the material to be ejected extends as far forwardly as possible towards the tip of the ejection location.
SUMMARY OF THE INVENTION
According to the present invention an ejection apparatus for ejecting material from a liquid, comprises
an ejection cell for containing the liquid in use, the cell having a protrusion disposed in the cell and defining a predetermined location for a meniscus of the liquid at an opening in the cell; and
an ejection electrode disposed in the cell at a position inwardly of the cell with respect to the predetermined location.
The protrusion may disposed so as to be contacted by liquid in the cell on more than one side.
The means for defining a predetermined location for a meniscus of the liquid preferably comprises a substantially triangularly shaped insulating separator.
By arranging the separators in this form, it has been found that the meniscus of the carrier liquid extends further forward than in the case of a cell of cylindrical design.
Preferably, a portion of the electrode also has a triangular shape tapering to an apex away from the opening, but does not extend as far forward as the tip of the separator and so lies at a position behind the predetermined location of the liquid's meniscus.
In an alternative construction, the cells between the separators are further defined by inner walls so that each cell has a pair of limbs each extending along one of the outer surfaces of the separators. Liquid may then flow in a path along one of the cell limbs to the ejection location and then away from the ejection location along the other limb.
In another alternative construction, the means for defining the predetermined location of the meniscus comprises a substantially triangular insulating separator and a substantially rectangular insulating separator.
Preferably, in this construction, the cells between the separators are also further defined by inner walls so that each cell forms a channel in which liquid may flow. A triangular separator at an ejection location has an apex, the shape of which defines the predetermined location of the meniscus.
REFERENCES:
patent: 4504844 (1985-03-01), Ebi et al.
Blakey David Mark
Emerton Neil
Janse Van Rensburg Richard Wilhelm
Newcombe Guy Charles Fernley
Schumann Matthew Alexander
Barlow John
Dykema Gossett PLLC
Gordon Raquel Yvette
Tonejet Corporation Pty. Ltd.
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