Patent ID: 8008581

Claim:
A circuit board used for reflow soldering, comprising: a board; a first conductive pad provided on the board; a second conductive pad provided with a first distance from the first conductive pad; a mask covering a surface of the board, the mask having an opening, the opening extending over the first conductive pad, the second conductive pad and an intervening region of the board between the first and second conductive pads; and a reflowed solder that fills the opening, the reflowed solder extending over the first conductive pad, the second conductive pad and the intervening region, the reflowed solder connecting the first conductive pad and the second conductive pad, wherein the opening is substantially elliptical in shape, the intervening region is positioned at a center region of the opening in a longitudinal direction of the opening, the first and second conductive pads are positioned at opposite side regions of the opening in the longitudinal direction, and the first and second conductive pads respectively have first and second edges that confront each other and that are straight and parallel to each other, wherein the first conductive pad and the second conductive pad are semi-elliptical in shape.