Patent ID: 7834284

Claim:
A key unit that is installable in a mobile device comprising a casing having an opening, the key unit comprising: (i) a key pad including pad members made of a rubber elastic body, and a reinforcing plate made of at least one of a hard resin and a metal, wherein the reinforcing plate comprises: a base in which a plurality of apertures are formed and which constitutes a bottom portion of a central concave portion of the reinforcing plate; a support frame which extends in a circumferential direction so as to surround a perimeter of the base, which is exposed to an outside of the mobile device, and which is positioned at a higher level than the base in a vertical direction, wherein the support frame is adapted to be fitted into the opening of the casing of the mobile device so as to install the key unit directly from outside of the mobile device; and a step by which the base and the support frame are coupled in the vertical direction; (ii) a decorative layer which covers a surface of the support frame of the reinforcing plate and to which a decoration is one of applied, molded, and formed into a shape of a letter or symbol; and (iii) a shading sheet which covers at least connection parts of the base and the pad members.