| 摘要 |
PROBLEM TO BE SOLVED: To reliably position a substrate unit without using a conventional positioning axis (p) or the like. SOLUTION: A front plate 10 having a nearly U shape in terms of top view is mounted to the front of a substrate unit 9 while the opening side of the front plate 10 faces the side of a back section 1a in a case body 1, a shield spring 12 is fitted to one side section 10a of the front plate 10, and at the same time engagement sections 10e are formed at upper and lower ends of one side section 10a of the front plate 10. Further, engagement groove sections 3c and 4c to which one engagement section 10e engages are formed at the forward- sagging piece section 3a of an upper wall 3 and the standing piece section 4a of a lower wall 4. Then, when the substrate unit 9 is inserted to a substrate- mounting rail 7, the engagement piece section 10e is engaged to the engagement groove sections 3c and 4c before the shield spring 12 provided at one side section 10a of the front plane 10 is brought into contact with other side sections 10b of the front plate 10 of another adjacent substrate unit 9 or a right wall 6, thus positioning the substrate unit 9.
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