Patent ID: 8242400

Claim:
A data input device comprising: a switch making it possible to input data, a stem that is mobile relative to a module, the stem configured to move from a stable position when subjected to an applied force, making it possible to operate the switch, a return spring forcing the stem to return to the stable position when the stem is not subjected to the applied force, and means for modulating a force exerted by the return spring in order to define a peak of force at a point of travel of the stem beyond which the switch is operated, wherein the means for modulating the force further comprises a circular element that can be displaced roughly perpendicularly to the displacement of the stem, a cam attached to the stem, elastic means holding the circular element pressed against the cam, the cam comprising a slope, a high point and a counter-slope on which the circular element bears in succession when the stem is operated from its stable position to a position in which the switch is operated.