Probe card device and flat signal transfer structure thereof

A probe card device, comprising:

• a flat signal transfer structure including:
• a transfer plate having a first surface and a second surface that is opposite to the first surface, wherein the transfer plate includes a receiving slot recessed from the first surface and a plurality of signal circuits each having a signal contact arranged on a bottom of the receiving slot, and a portion of the transfer plate arranged around and adjacent to the receiving slot is defined as a supporting portion;
• and
• a retaining cover having a plurality of thru-holes and disposed on the supporting portion, wherein the retaining cover and the receiving slot of the transfer plate jointly and surroundingly define a receiving space;
• and
• a plurality of conductive probes each having an elastic segment, a detecting segment, and a connecting segment, the latter two of which are respectively arranged at two opposite sides of the elastic segment, wherein the conductive probes respectively pass though the thru-holes of the retaining cover, the elastic segment and the connecting segment of each of the conductive probes are arranged in the receiving space, and the detecting segment of each of the conductive probes is exposed out of the receiving space and protrudes from the first surface, and wherein the connecting segments of the conductive probes are respectively fixed on the signal contacts of the transfer plate.