| 摘要 |
PROBLEM TO BE SOLVED: To prevent cracking of a resin case and realize a package structure of high reliability whose thermal resistance is small, by making a sectional shape in the axial direction of a metal cylinder for attaching a package which is arranged on an encapsulation resin case, an S-shape. SOLUTION: An S-shaped metal cylinder 3a is buried in resin 8 of a resin case 1, a surface in contact with a metal base 2 of the S-shaped metal cylinder 3a is protruded from the surface of the resin 8, and the height of the protrusion part 25 (a gap between the resin case 1 and a metal base 2) is about 0.2-0.3mm. A cavity part of the S-shaped metal cylinder 3a and a through hole of the metal base 2 become a fixing hole 21. Since the left side sectional shape out of sections in the axial direction of the cylinder is an S-shape, the metal cylinder 3a is called an S-shaped metal cylinder. By applying the S-shaped structure, adhesion with the resin 8 is increased without knurling. Since the S-shape machining is enabled by continuous drawing, the manufacturing cost is low, and mass production is enabled. |
