| 摘要 |
PROBLEM TO BE SOLVED: To dissipate heat received by a heat receiving face efficiently by placing a heat dissipation fin of spiral shape projected to a heat receiving face on one hand and to a heat dissipation side on the other hand respectively at a side opposite to a heat source at a prescribed interval on a heat receiving plate. SOLUTION: A unit mount shelf 50 containing printed circuit board units 55a-55n, a module 40, and a spiral heat dissipation fin 11 covered by a heat dissipation fin cover 13 are placed in the interior of a case 60 of the outdoor small sized base station equipment. The spiral heat dissipation fin 11 whose thermal resistance with respect to external air is minimum is fitted to a side opposite to an amplifier 40 being a maximum heat source. Thus, the heat generated from the amplifier 40 and the printed circuit board units 55a-55n produces convection as shown in the arrow. Then the heat is efficiently dissipated through a conventional heat dissipation fin 43 fitted to the amplifier 40 and the spiral heat dissipation fin 11 while being converted inside the case 60. Thus, the heat received by the heat receiving face is dissipated efficiently.
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