Abstract: The invention relates to a push-button (5) having a housing (10), with which there are associated at least a first actuation member (6) which triggers a haptic control signal and one or more permanent magnet(s) (3) which can be guided past at least a second actuation member (2) which triggers a switching operation, and there is associated with the first actuation member (6), which triggers a haptic response, a control element having a first progressive or degressive control face portion (6.1) and at least a second adjoining control face portion (6.2) which behaves in an inverse manner and along which the actuation member is guided.

Abstract: The invention relates to a printing chip for a printing head working according to the ink-jet printing principle, having at least one recess forming a medium chamber in the printing chip, a deflectable diaphragm forming one wall of the medium chamber, a duct opening in the medium chamber for feeding a liquid medium that is to be squirted out hot, and having a squirting-out opening connected to the medium chamber, which printing chip is distinguished by the fact that the printing chip (2) is produced exclusively from monocrystalline silicon.