Patent ID: 7166497

Claim:
A method of manufacturing an electronic component package, comprising the steps of: providing a case and a lid member, the case having a cavity portion containing an electronic component therein a first metal layer laminated on the case, and a surface metal layer laminated on the first metal layer for facilitating fusion welding, and the lid member having a second metal layer laminated on one side of a core portion; and fusion-welding the lid member to the case, including superposing the lid member on the case so that the second metal layer abuts the surface metal layer of the case via a soldering material, and holding the case and the lid member under heating to allow a major component of the soldering material and each major component of the first metal layer and the second metal layer to diffuse to form first and second intermetallic compound layers, which sandwich therebetween a soldering material layer formed of the remainder of the soldering material; wherein during the fusion-welding step, the case and the lid member are held under heating to form a fusion-welding layer including the first and second intermetallic compound layers and the soldering material layer so that a ratio of an area of the first and second intermetallic compound layers in a longitudinal section of the fusion-welding layer relative to an area of a longitudinal section of the fusion-welding layer is about 25% to about 98% after the fusion-welding step is completed.