|MadSci Network: Engineering|
Dear Mr. Yener, Home and office ink jet printers either work by the thermal (bubble jet) or piezo principle. In the thermal ink jet print head, the actuator (see picture) is in fact a heating plate which creates a steam bubble in the ink , which ejects a drop of ink through the nozzle (opening) onto the paper, in a direction either parallel (Canon) or perpendicular(HP)to the heating element. In the piezo ink jet head, the actuator is a piezoelectric element, i.e. a piece of material which deforms under the influence of an electric field, and thus squeezes the ink chamber to eject an ink drop. All this happens very quickly, so that around 6000 drops can be ejected in one second! The principle is rather simple, and one wonders how it can work, but the details make the difference, and these are highly proprietary (See e.g. European Patent Application No.0588241 A2 or U.S. Patent No.4597794). Best regards W. Sieber
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