(57) A mosaic printing head with cross talk prevention means comprises a plurality of
electromagnetic structure formed by magnetic circuits (39), each coupled to a coil
(41) and closed by a movable armature (43), which at rest leave an air gap in the
magnetic circuit.
The magnetic circuits are radially distributed on a supporting member, very closely
together at least with a certain portion.
The flux leakage which occurs in these portions, due to the proximity of such portions,
is avoided by using conductive non magnetic shields (42) partially surrounding such
portions.
The shields dinamically limit flux leakage transients, i.e. during the attraction
of the armature, dueto the eddy currents induced by flux leakage.
The shields are designed in order to be coupled with flux leakages and not with the
main flux in the magnetic circuit.
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