| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling device of a heat generating substrate which is excellent in life. SOLUTION: The cooling device 10 of a heat generating substrate has a frame body 11 enclosing a heat generating substrate 20. Two cooling fans 12a, 12b are fixed opposite to each other to the frame 11 so that they tilt in the range of 1 deg. or more to less than 90 deg. to the heat generation substrate 20, respectively. A switch circuit 13 which makes the two cooling fans 12a, 12b operate alternately at a proper time interval is connected to the two cooling fans 12a, 12b.
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