| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem, where it is difficult to have the temperature rise to be sufficiently suppressed by making a frame of an aluminum material, since the switching speed of the power transistor is elevated by the demand for high-speed processing of controls in the recent years. SOLUTION: The electronic apparatus is composed of a module board, having a switching element 3 mounted thereon and an aluminum material-made housing for fixing the module board, the housing is processed with black alumite for enhancing the thermal radiation ratio, the module board backside being coated with a silicone 7 having a satisfactory thermal conductivity and by making it secured between the bottom of the housing and the module board, the temperature rise in the switching element on the module board is suppressed.
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