A button assembly comprises a cylindrical key top (132) loosely inserted into a hole (126) formed on a casing (10). The upper surface of the key top (132) is a pressed face (134). The assembly further comprises a deformation member (150) disposed below the key top (132) in the pressing direction. The...http://www.google.fr/patents/US7129433?utm_source=gb-gplus-shareBrevet US7129433 - Button assembly and an electronic device
