| 摘要 |
PROBLEM TO BE SOLVED: To provide a closed circuit device which includes a circuit unit housed in a closed case and has a simple structure enabling grounding connection. SOLUTION: The closed circuit device 100 includes the circuit unit 10 and the closed case unit 20. The circuit unit 10 has a circuit board 11, a case body 12 connected conductively to the circuit board 11, and a cover 15 connected conductively to the circuit board 11. Projections 14 are formed on enclosures 13a and 13b of the case body 12, respectively. The closed case unit 20 has a closed case 21, a closed packing 24, and a blocking plate 22. The circuit unit 10 is housed in the closed case 21 while the projections 14 scrape the inner wall of the closed case 21. Once housed in the closed case 21, the projections 14 are put in a state of pressure contact with the inner wall of the closed case 21, and thus connected conductively to the closed case 21. The blocking plate 22 is connected conductively to the closed case 21. By the projections, a grounding path is formed of the circuit board 11, the case body 12, the closed case 21, and the blocking plate 22 in a simple structure. COPYRIGHT: (C)2009,JPO&INPIT
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