Patent ID: 6849939
Filing Date: 2005-02-01
Classification: H01L

Abstract:
1. An electronic component package comprising: a case having a cavity portion having an opening portion and containing an electronic component therein; a fusion-welding layer; and a lid member that is fusion-welded to the cavity opening portion of the case via the fusion-welding layer to hermetically seal the cavity portion of the case; wherein the case includes a first metal layer laminated on the case so as to be exposed on the cavity opening portion; the lid member includes a core portion, and a second metal layer laminated on a side of the core portion facing the case; the fusion-welding layer having a soldering material layer made of a soldering material, and first and second intermetallic compound layers respectively disposed on opposite sides of the soldering material layer and formed as a result of diffusion of a major component of the soldering material and each major component of the first metal layer and the second metal layer, and a ratio of an area of the first and second intermetallic compound layers in a longitudinal section of the fusion-welding layer to an area of a longitudinal section of the fusion-welding layer is in a range of from about 25% to about 98%.