Foldable input device

A method of folding an input device between a flat orientation in which both ends of a module comprising a sensor are within the input device and a curved orientation in which one of the ends of the module protrudes from the input device, the input device comprising a head portion comprising a recess, the module coupled to the head portion within the recess, a foldable tail portion coupled to the head portion, a slidable frame comprising an anchor portion affixed to the foldable tail portion and a connecting portion configured to slide relative to the tail portion as the foldable tail portion is folded, and a linkage affixed to the slidable frame and configured to engage and move the module relative to the head portion upon sliding of the slidable frame relative to the tail, the method comprising:

• bending the foldable tail portion from the flat orientation to the curved orientation, thereby causing the linkage to move toward the head portion and to thereby cause the module to move from a recessed position within the recess to a protruding position beyond the recess.