| 摘要 |
PROBLEM TO BE SOLVED: To position and fix a substrate to a chassis. SOLUTION: A recessed part 1a is formed on one end surface of a substrate 1. A pawl part 21x which is bent inside corresponding to the recessed part 1a of the substrate 1 is formed on the peripheral wall 21 of the chassis which wall faces the one surface where the recesses part 1 a of the substrate 1 is formed. When the substrate 1 is built in the chassis 2, the substrate 1 is positioned to the chassis 2 by engaging the recessed part 1a of the substrate 1 with the pawl part 21x of the chassis 2.
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