PURPOSE: To obtain a pin type radiation fin having high radiation efficiency by manufacturing pins constituting the radiation fin every single substance and connecting a fixed number of pins to a substance to be irradiated.
CONSTITUTION: Pins 1 constituting a radiation fin are previously manufactured one by one in single substances, and later a fixed number of pins 1 are connected with a substance to be irradiated such as an LSI package. A shape of the pin has no special restriction, however, for instance, columnar metal pins 1 having high thermal conductivity are integrally formed with the connection parts 2. In this way, a pin pitch can be made minute as compared with a prior base-pin integrated type radiation fin. Thereby, a pin type radiation fin 3 having high radiation efficiency can be obtained.
SHIRAI MASAYUKI
OTSUKA KANJI
MIWA TAKASHI
HATADA TOSHIO
MATSUSHIMA HITOSHI
KONDO YOSHIHIRO
HITACHI VLSI ENG