| 摘要 |
In a portable radio device comprising a housing (20), a printed wiring board (11) encased in the housing, and a machine screw (50) for fastening the board to the housing through a tapped and a via hole (17) and (25), the machine screw has head and threaded portions (51) and (52) and an insulating cap (55) of a cylindrical shape covering the head portion and having at least one groove. Preferably, a pair of the grooves (56, 57) are formed parallel to an axis of the machine screw. The head portion may be circular or polygonal in cross section and have at least one screw slot. At least one groove may be formed on an upper end surface of the insulating cap. Alternatively, the machine screw may wholly be made of an insulating material. |
