Patent ID: 7551436

Claim:
An electronic apparatus comprising a plurality of cooling fans arranged in a lower part of a case, a plurality of temperature sensors arranged in an upper part of said case, and a plurality of electronic substrates so arranged between said cooling fans and said temperature sensors as to secure air flow paths, with an ambience test of inserting an ignition source for a certain length of time into the case, characterized in that: said electronic apparatus having a control unit that measures at predetermined intervals of time the temperature within the case with said temperature sensors, compares the temperature measured the latest time with the temperature measured at the preceding time for each of said temperature sensors and, if a temperature rising rate measured is greater than a predetermined value for one or more of said temperature sensors, and if the temperature measured at the latest time is higher than the temperature measured at the preceding time for each of said one or more temperature sensor(s), increases an air flow rate of said plurality of cooling fans, wherein said control unit maintains the increased temperatures within the case, which are measured by the temperature sensors, at a temperature of less than the self-igniting point of the electronic substrates, even in the presence of said ignition source.