Patent ID: 8379386

Claim:
An electronic apparatus comprising: a main unit case that houses electric components including a heat generating element; a heat dissipation chamber that is formed by liquid tightly separating an internal space of the main unit case with a partition and is provided with an inlet air vent and an outlet air vent in the partition, in which a heat dissipation portion is positioned; a cooling fan that is located in the heat dissipation chamber so as to send air to the heat dissipation portion; an inlet that is provided in the main unit case to introduce outside air into the heat dissipation chamber through the inlet air vent; and an outlet that is provided in the main unit case to exhaust an air flow sent from the cooling fan to the outside through the outlet air vent, wherein an air channel for communicating the heat dissipation chamber with the inlet is formed so as to extend from the inlet air vent through a side wall of the main unit case, and is liquid tightly sealed from the internal space of the main unit case with a sealing wall, and a plurality of plate-shaped ribs are provided in the air channel so as to extend in a flow path direction and arranged in a lateral direction of the inlet air vent to divide the air channel into a plurality of sub-channels.