Patent ID: 7755912

Claim:
A printed circuit board unit comprising: a first board; first electrically-conductive terminals fixed and exposed on a front surface of the first board within a specific area of the first board in a matrix; second electrically-conductive terminals having flexibility arranged in a matrix, each of the second electrically-conductive terminals disengageably brought in contact with the corresponding first electrically-conductive terminal; a second board having a front surface for supporting the second electrically-conductive terminals; a static pressure member received on a back surface of the first board within an area corresponding to the specific area to generate a static pressure; an urging plate overlaid on the static pressure member so that the static pressure member is interposed between the urging plate and the first board to exhibit an urging force applied to the first board toward the second board; an electronic component chip mounted on the back surface of the first board; and a heat sink placed on a back side of the urging plate, the heat sink extending through window openings respectively defined in the urging plate and the static pressure member to touch the electronic component chip, the heat sink exhibiting an urging force applied to the electronic component toward the second board independently from the urging force of the urging plate.