Patent ID: 8717771

Claim:
An electronic device, comprising: a covering plate; a case, covered by the covering plate and comprising a first datum surface and a second datum surface, wherein a distance between the covering plate and the first datum surface is greater than a distance between the covering plate and the second datum surface; at least one first fixing unit, disposed on the first datum surface, wherein the first fixing unit comprises a first screwing boss and at least one first rib, and the first rib is adjacent to the first screwing boss; at least one second fixing unit, disposed on the second datum surface, wherein the second fixing unit comprises a second screwing boss and at least one second rib, and the second rib is adjacent to the second screwing boss; a circuit board, disposed in the case; and a plurality of screwing members, passing through the covering plate to fix the circuit board in the case, wherein the screwing members are screwed to the corresponding first screwing boss and second screwing boss.