Patent ID: 7782070

Claim:
A probing device for transmitting test signals from a tester to an IC wafer for measuring electric characteristics of said IC wafer, the probing device comprising: a rack, said rack defining a top surface and a bottom surface opposing said top surface, said rack comprising a first support member and a second support member surrounded by said first support member; a circuit layer mounted on said top surface of said rack and supported on said first support member, said circuit layer comprising a plurality of test contacts for electrical connection of said tester; a probe assembly, said probe assembly comprising an electrically insulated probe holder supported on said second support member and a plurality of probes fixedly mounted in said probe holder, each said probe having a tip suspending below said probe holder; and a plurality of signal lines electrically connected between said test contacts of said circuit layer and said probes of said probe assembly; wherein the first support member of said rack comprises at least one ring portion and a plurality of radial ribs, the cross-sectional region of the composition of said at least one ring portion and said radial ribs being corresponding to the transverse cross-sectional region of said circuit layer and kept in contact with one horizontal surface of said circuit layer.