Electronic device

An electronic device comprising:

• a top plate having opposing first and second edges, opposing third and fourth edges that are perpendicular to the first and the second edges, a first portion with a first upper surface formed at an interior portion of the top plate and along the first, second, and fourth edges, and a second portion with a second upper surface at an elevation that is lower than an elevation of the first upper surface, the second upper surface being formed along an entire third edge of the top plate and to extend from the first edge of the top plate to the second edge of the top plate, the top plate further including at least one screw hole formed on the second portion;
• a bottom plate provided under the top plate;
• and
• a circuit board placed between the top plate and the bottom plate and mounted with an electronic component,
• wherein the top plate further includes a rib on the first portion and a plurality of recessed portions formed on the rib, and
• wherein the rib is at an elevation that is lower than the elevation of the first upper surface, and each of the plurality of recessed portions is at an elevation that is lower than the elevation of the rib.