Patent ID: 6028774
Filing Date: 2000-02-22
Classification: G06K,H01L,H05K

Abstract:
A base card for receiving a Chip on Board (COB) package having a printed circuit board, a semiconductor chip electrically connected to the printed circuit board via electrical connections and around which a peripheral portion of the printed circuit board extends, and a package body encapsulating the chip and the electrical connections, said base card comprising:an upper surface, a middle portion which is stepped downward from said upper surface to form a receiving part configured to receive the COB package, and a bottom surface,said receiving part consisting of a first section for receiving the peripheral portion of the COB package and a second section for receiving the package body of the COB package,said first section including a side surface extending downward from said upper surface, and a bottom surface defining the bottom of said first section, andsaid second section including an inclined surface extending downwardly at an inclination with respect to the bottom surface of the first section of said receiving part, and a bevel extending from the bottom surface of the first section of said receiving part to said inclined surface, said bevel having a slope greater than that of said bottom surface of the first section of said receiving part and less than that of said inclined surface,whereby an annular space will be formed between said bevel, the package body of the COB package, and the printed circuit board when the COB package is mounted and attached to the base card with the peripheral portion of the printed circuit board received in the first section of said receiving part and the package body received in the second section of said receiving part.