Haptic knob, in particular for an electric or electronic apparatus, for example a household appliance

A knob (10), in particular for an electric or electronic apparatus;

• said knob comprising:
• a support structure defining a chamber containing a magnetorheological fluid;
• a holding element which is supported in a guided manner by said support structure, is configured to be held by a user and is configured to be rotated and pressed by said user;
• a movable portion which is supported, in rotation, by said support structure and is configured to be controlled, in rotation, by said holding element;
• a switching member which is movable from a rest arrangement to a work arrangement when said holding element is pressed by said user;
• a sensor which is configured to detect the an angular position assumed by said movable portion;
• a haptic feedback assembly which is located in said chamber and is configured to act upon said movable portion (13) so as to provide a haptic stimulation in response to the action of said user;
• a generating apparatus which is configured to emit a magnetic field, the magnetic field having an intensity capable of affecting the viscosity of said fluid in such a way that said assembly exerts a force upon said movable portion;
• and
• a control device which is configured to determine intensity of said magnetic field depending on predetermined or programmable criteria which are based on at least one between said angular position and said arrangement.