Patent 7459925 was granted and assigned to Nanya Technology Corporation on December, 2008 by the United States Patent and Trademark Office.
A PCB of a probe card includes a first region, a second region, a third region and a fourth region arranged clockwise. The circuit pattern of the first region corresponds to the circuit pattern of the third region. The circuit pattern of the second region corresponds to the circuit pattern of the fourth region, wherein the circuit pattern of the first region is different from the circuit pattern of the second region.