| 摘要 |
PURPOSE:To incorporate an electromagnetic shield effect inside a package by a shim by regarding a part between a welded part and the inside of the package as an electromagnetic space and hence affecting influence of a function of a hermetically sealing cap to be used in a high frequency band. CONSTITUTION:A cap 1 is formed in a drawn structure. A shim 2 in which four directions are formed in a leaf spring structure is welded to its drawn part. The shim 2 has a size in which, when the cap 1 is welded to a package, it is brought into contact with the package outside the inner wall of the package. The shim 2 is brought into contact with the package thereby to give an electromagnetic shield effect to the part. |
