| 摘要 |
PURPOSE:To improve wetproofing, and to prevent the effects of curing stress and alpha-rays exposure by providing a first base body with a metallic layer and an insulating layer and a second base body, which has a metallic layer and an insulating layer and is fixed to the first base body so that the periphery of an electronic part is hollowed. CONSTITUTION:A first base body 10 consists of a reinforcing layer 1a, in which glass fiber, etc. are impregnated with a synthetic resin such as epoxy resin, and an insulating layer 3a, which is formed on the surface of a metallic foil in aluminum, etc. or a metallic layer 2a such as a metal evaporated film and composed of epoxy resin or a composite material, etc. of epoxy resin and polyester fiber, etc. An electronic part 4 mounted through a die pad 5 has a projecting section 20a at an opposite position so that the periphery is formed in a hollow section 20b. A second base body 20 fixed to the first base body 10 by its own periphery is constituted by a reinforcing layer 1b, a metallic layer 2b formed on the surface of the reinforcing layer 1b and an insulating layer 3b consisting of a composite material, etc. shaped onto the surface of the metallic layer 2b. |
