Patent ID: 7745914

Claim:
An electronic device comprising: an electronic part; a package that receives the electronic part; and a sealing member that seals the electronic part; wherein the package comprises: a heat radiating plate having a surface including a mounting area where the electronic part is mounted; a frame body adhered to the surface surrounding the mounting area and defining an interior area of the package and an exterior area of the package; and a wiring conductor derived from the interior area to the exterior area; wherein the heat radiating plate comprises: a metallic base body defining a hole located under the electronic part and mounting area; a metallic body filling inside of hole; and a metal layer on the metallic base body and the metallic body; wherein the mounting area is located on the metal layer above the metallic body; wherein both the metallic body and the metal layer have higher thermal conductivity than the metallic base body; wherein both the frame body and the metallic base body have a smaller coefficient of thermal expansion than the metal layer; wherein the electronic part is electrically connected with the wiring conductor; and wherein an outer circumference of the metallic body is located outside of an outer circumference of the electronic part when the heat radiating plate is viewed in a plane perspective.