Probe card structure

1. A probe card structure, comprising:

a circuit board;

an adapter board disposed on one side of the circuit board, a plurality of electrically conductive pillars formed on one surface of the adapter board that faces the circuit board, a solder ball disposed on one end of each of the plurality of electrically conductive pillars facing the circuit board;

a probe head assembly including a plurality of probes, the probe head assembly coupled to the adapter board, and the plurality of probes electrically connected to the adapter board; and

an interposer board disposed between the adapter board and the circuit board, wherein a plurality of second electrically conductive pillars are formed on one surface of the interposer board facing the circuit board, a second solder ball is disposed on one end of each of the plurality of second electrically conductive pillars facing the circuit board, and the interposer board is soldered to the circuit board through the plurality of second solder balls of the second electrically conductive pillars;

wherein the adapter board is soldered to the interposer board through the plurality of solder balls of the plurality of electrically conductive pillars, and

wherein each of the electrically conductive pillars has a same size and each of the second electrically conductive pillars has a same size.

2. The probe card structure according to claim 1 , further comprising a fixing frame member detachably fixed on the one side of the circuit board and abutted against a periphery of the probe head assembly, and the fixing frame member being used to fix the adapter board and the probe head assembly on a same side of the circuit board.

3. The probe card structure according to claim 2 , further comprising a structure strengthening member, wherein the structure strengthening member and the adapter board are respectively arranged on opposite sides of the circuit board.

4. The probe card structure according to claim 3 , further comprising a plurality of locking members, wherein the fixing frame member includes a plurality of first through holes, the circuit board includes a plurality of second through holes corresponding to the plurality of first through holes, and the structural reinforcement member includes a plurality of threaded holes corresponding to the plurality of second through holes; wherein the plurality of locking members respectively pass through the plurality of first through holes and the plurality of second through holes to be inserted in the plurality of threaded holes, so as to fix the fixing frame member.

5. The probe card structure according to claim 1 , wherein a material of the plurality of electrically conductive pillars is copper or a copper alloy.

6. The probe card structure according to claim 1 , wherein a diameter of the plurality of electrically conductive pillars is less than 200 μm.

7. The probe card structure according to claim 1 , wherein one end of each of the plurality of probes is electrically connected to the adapter board, another end of each of the plurality of probes is in contact with a device under test, and the adapter board and the device under test have same material characteristics.

8. The probe card structure according to claim 7 , wherein the material characteristics include hardness, ductility, electrical conductivity, or thermal expansion coefficient.