Patent ID: 7351928

Claim:
A key input device comprising: a key input unit including a key cap, a movable mechanism, a pressure sensing part, a plate and a frame housing the movable mechanism and the pressure sensing part; and an illuminating unit illuminating the key cap from a bottom of the key input unit through the movable mechanism and the pressure sensing part, wherein, the plate is disposed between the pressure sensing part and the illuminating unit, wherein the key input unit and the illuminating unit are configured in such a way that they are independently waterproofed, wherein a first waterproof seal is applied to a surface of the plate and a surface of the illuminating unit, the surface of the plate extending away from the surface of the illuminating unit, and wherein the pressure sensing part includes an upper sheet and a lower sheet which include respective contacts facing each other, and a second waterproof seal is applied to a periphery between the upper sheet and the lower sheet.