| 摘要 |
PURPOSE:To easily take a plastic case main body out of a metallic mold, to easily obtain the size accuracy of the plastic case main body, and to surely fit a plastic case rear lid by providing a projection part outside the opening part side of the plastic case main body. CONSTITUTION:The bottomed cylindrical plastic case main body 11 which has the projection part 12 provided outside the opening part side and the plastic case rear lid 13 which has a hole 14 formed in its outer peripheral part so that the projection part 12 is fitted by penetration are used. Then a piezoelectric vibration plate 15 is pressed and held in the plastic case main body 11 with the projection part 13a provided to the plastic rear lid 13. Consequently, when the plastic case main body is taken out of the metallic mold, it can easily be taken out, the size accuracy of the plastic case main body is easily obtained, and the plastic case rear lid can surely be fitted. |
