Patent ID: 6921970

Claim:
A lid material for a lid of an electronic component package, the lid being adapted to be fuse-bonded to a portion of a case around an opening through which an electronic component housing space defined in the case opens in a surface of the case, the lid material comprising: a base layer composed of a low thermal expansion metal; an intermediate metal layer provided on one surface of the base layer and composed of a low proof stress metal having a proof stress of not greater than about 110N/mm 2 ; and a brazing material layer provided on the intermediate metal layer and composed of a silver brazing alloy mainly comprising silver; wherein the intermediate metal layer and the brazing material layer are press- and diffusion-bonded to each other, and the brazing material layer has a blistered area ratio of not greater than about 0.5% as observed on an outer surface of the brazing material layer.