| 摘要 |
An electronic device includes a printed circuit board, a heat generating component disposed on the printed circuit board, and a casing including the printed circuit board and the heat generating component, the casing allowing an air flow to flow from an outside to an inside of the casing. The printed circuit board includes a first and second openings and an extending portion formed between the first and second openings so as to extend in a flow direction of the air flow in the casing, and the extending portion includes a conductive pattern and is located opposite the heat generating component.
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