INK WRITING HEAD WITH PIEZOELECTRICALLY EXCITABLE MEMBRANE

摘要

An ink writing head provided with ink ejection passages with their associated piezoelectric transducers, said passages being fed with a writing liquid via supply lines, comprises transducers with an electrically excitable membrane consisting of a first piezoelectrically excitable layer and a support layer suddenly attached to the latter. The piezoelectrically excitable layer has injectable regions which are broken down into a peripheral region and a central region. To produce the necessary projection of the membrane, the regions of the latter are excited in such a way that the peripheral region is shortened preferably by transverse contraction and the central region is elongated.