Patent ID: 6905188

Claim:
An ejection apparatus for ejecting material from a liquid at a plurality of ejection locations, the apparatus comprising a printhead having a plurality of channels through each of which liquid flows in use to supply liquid to a respective ejection location at an open end of the channel, and a plurality of channels through each of which liquid flows in use to remove depleted liquid from the respective ejection location at an open end of the channel, wherein each channel is one of a pair of co-operating channels, the two cooperating channels thus having a common end, an ejection electrode disposed at each ejection location and by means of which an electric field is created in use to cause the ejection of material from the liquid, and an electrically conductive path to each ejection electrode for supplying a voltage to the ejection electrode in use, wherein the channels are isolated from one another and separated from the electrically conductive paths over substantially the whole of the length of the electrically conductive paths.