Patent ID: 7710720

Claim:
An electronic device having an exhaust opening configured to exhaust air outside, the electronic device comprising: a door part configured to close the exhaust opening by rotating; and a line shaped member stretched along the substantially full width of the door part so as to keep the door part from rotating and keep the exhaust opening open; wherein the lined shaped member is formed of meltable materials and has a substantially uniform cross-sectional shape; wherein when the line shaped member is cut or extended in a length equal to or greater than a designated length, the door part is rotated by the own weight of the door part and closes the exhaust opening; elastic members are provided at the exhaust opening and in the vicinities of both ends of the door part; the elastic members have a natural position and are separated in their entirety by a distance greater than a full width of the door part, and the elastic members are elastically deformed by providing the line shaped member; the door part is supported by the elastically deformed elastic members so that the door part is maintained opened; and when the line shaped member is cut or extended in a length equal to or greater than the designated length due to excessive heat in the electronic device causing the meltable materials of the line shape member to melt, the elastic members return to the natural position, support of the door part is broken and the door part is rotated by the own weight of the door part and closes the exhaust opening.