Patent ID: 8642896

Claim:
A printed circuit board comprising: a surface-mount type electronic component including a terminal array on one surface thereof; a printed circuit board main body having a mounting area on a first surface of the printed circuit board main body and a recess being provided at a recess area on a second surface that is a back side of the first surface of the printed circuit board main body, part of the printed circuit board main body being between the first surface and bottom of the recess, the terminal array of the electronic component being mounted on the printed circuit board in contact with the mounting area, the recess area being provided to correspond to the mounting area; and a thermal expansion control element being placed in the recess and having a smaller thermal expansion coefficient than the printed circuit board main body, wherein an insulating adhesive is applied onto a sidewall of the recess and the bottom of the recess so as to cover an inner wall of the recess, and the thermal expansion control element is fixed in the recess with the insulating adhesive to electrically insulate the thermal expansion control element from the electronic component.