| 摘要 |
PROBLEM TO BE SOLVED: To provide the case structure of an electronic circuit board that prevents dust and dirt from entering from the outside and impurities in the air from entering, fully radiates heat in an internal electronic circuit, has superior maintainability and productivity, and does not generate unpleasant noise. SOLUTION: A radiation fin 24 is provided in the outer periphery of a case 13, thus dissipating heat radiation from an electronic circuit board into the air by the case and radiation fins, and cooling the case efficiently and naturally. The electronic circuit board is accommodated airtightly into the case, thus preventing dust and dist, impurities, or the like from infiltrating the case. Also, the case is divided while the case can be opened and closed and at the same time, be blocked airtightly, thus facilitating assembling. In addition, heat- generating parts are mounted directly onto the internal wall of the case, thus radiating heat efficiently.
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