Patent ID: 7980861

Claim:
A printed circuit board unit comprising: a first substrate; a first electrically-conductive terminal located on a front surface of the first substrate; a second electrically-conductive terminal contacting with the first electrically-conductive terminal, the second electrically-conductive terminal having flexibility; a second substrate having a back surface supporting the second electrically-conductive terminal; a third electrically-conductive terminal located on a front surface of the second substrate, the third electrically-conductive terminal having flexibility, the third electrically-conductive terminal connected to the second electrically-conductive terminal; a fourth electrically-conductive terminal contacting with the third electrically-conductive terminal; a third substrate having a back surface supporting the fourth electrically-conductive terminal; and a frame interposed between the first substrate and the third substrate so as to define a space for relative movement of the second substrate in a direction perpendicular to the front surface of the second substrate, the frame having a guiding surface surrounding an outer periphery of the second substrate to allow the relative movement of the second substrate.