| 摘要 |
The electric contact unit 1 according to the present invention comprises an insulating base board 2 incorporated with resilient coil-shaped electroconductive members 3. Each of the coil-shaped electroconductive members 3 may include a small number of turns, for instance a single turn, of coil wire, and comprises an intermediate part secured to the base board 2 and a pair of axial projecting parts projecting from either side of the base board. The base board 2 is secured relative to a semiconductor device 4 and a circuit board 6 in such a manner that the two ends of each coil-shaped electroconductive member resiliently engage an electroconductive ball 5 serving as a terminal fixedly secured to a lower surface of the semiconductor device 4 by soldering, and a terminal pattern 7 formed on the circuit board 6 disposed opposite to the ball. Because the number of turns of the coil-shaped electroconductive member can be reduced as desired so that electric current is not required to be passed through a path involving an undesirably large number of turns, the electric inductance and resistance of the electroconductive member can be thereby minimized while ensuring a sufficient resiliency to the electroconductive member. |
