Printhead nozzles using viscous drag

摘要

An ink jet printhead comprises a plurality of nozzles, each configured to eject drops of ink towards a surface to be printed. Each nozzle has a nozzle chamber defined by a floor portion, an upwardly extending peripheral sidewall and a roof portion having a depending peripheral sidewall and an ejection rim defining an opening. The sidewalls are arranged to at least partially overlap in a telescopic manner. Each nozzle chamber is configured for receiving ink via a conduit through a supply opening in the floor portion. The viscous drag of the ink due to the sidewalls of both the aperture and the conduit is such that it is sufficient to effect an ejection of an ink droplet through the rim. Fig. 4.