Microwave oven provided with an improved cooling system

A microwave oven incorporating therein an air cooling system, which comprises:

• an outer casing containing a cooking chamber and a compartment;
• a magnetron and a high voltage transformer positioned within the compartment;
• a cooling fan disposed within the compartment, the cooling fan forcing cooling air around the microwave oven to enter the compartment through an air intake opening and to leave the compartment along a first and second airflow route;
• and
• a screen plate disposed between the high voltage transformer and the cooling fan, the screen plate directing a part of the cooling air from the cooling fan to the magnetron which forms the first airflow route, and the other part of the cooling air from the cooling fan to the high voltage transformer which forms the second airflow route, so that the magnetron and the high voltage transformer are directly cooled by the cooling air.