| 摘要 |
To prevent interference between an electronic element mounted on a circuit board and a casing upon inserting the circuit board into the casing and to facilitate insertion of the circuit board into the casing. A casing adapted to contain a circuit board may have opposed side walls each having a guide groove. Each guide groove has a narrow width portion with an even width in an inner part of the casing and a wide mouthed portion at an inlet port of the casing. The wide mouthed portion has first and second opposed slant surfaces that are gradually spaced away from each other toward the inlet port. The slant starting point of the first slant surface is nearer the inlet port than the slant starting point of the second slant surface. When the circuit board is inclined and inserted through the inlet port into the casing, the leading end of the circuit board initially contacts the first slant surface to restrain the inserting angle of the circuit board, thereby preventing an electronic element mounted on the circuit board from interfering with the peripheral edge of the casing around the inlet port.
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