| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power controlling device having superior air tightness by solving the problem that security cannot be secured under an environment using a combustible gas since the power controlling device is not airtight. <P>SOLUTION: A component mounting board 7 is accommodated in a case body 8; and a sealing resin 11 and sealant are used in the gap of a hole section 8a from which a lead wire is pulled out and the gap between the case body 8 and a case cover 10, respectively, thus achieving a closed structure of the device and hence the power controlling device can be used at ease even under the environment of the combustible gas. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
