Prober for testing magnetically sensitive components
View Patent ↗A prober for testing components comprises a lower frame, over which a probe holder plate is disposed at a distance therefrom for receiving test probes that make contact with the components to be tested and to which a displacement device is connected. A substrate carrier is disposed in the space between the frame and the probe holder plate, and the probe holder plate is provided with an opening, below which the substrate carrier can be displaced. To expand the scope of application of probers used for testing components, all those components of the prober that surround the substrate are made from a non-magnetic material.
1. Prober for testing components, comprising: a lower frame, a probe holder plate disposed over and at a distance from the lower frame for receiving test probes that make contact with the components and to which a displacement device is connected, a substrate carrier disposed in a space between the frame and the probe holder plate, the substrate carrier being adapted to be displaced below an opening in the probe holder plate, wherein all components of the prober surrounding a substrate on the substrate carrier are made of a non-magnetic material.
2. Prober according to claim 1 , wherein an electromagnetic shield encasing the test probes and the substrate carrier is disposed below the probe holder plate.
3. Prober according to claim 2 , wherein the magnetic shield encases the displacement device at least partially.
4. Prober according to claim 2 , wherein the displacement device comprises an x-y cross-table for displacing the substrate carrier in an x-direction and a y-direction perpendicular to the x-direction, both the x-direction and the y-direction located in a plane lying parallel to the probe holder plate, and a z-drive for displacing the substrate carrier in a z-direction perpendicular to the probe holder plate, and the shield encases the x-y cross-table and comprises an opening, which the z-drive can penetrate.
5. Prober according to claim 2 wherein the displacement device comprises an x-y cross-table, for displacing the substrate carrier in an x-direction and a y-direction perpendicular to the x-direction, both the x-direction and the y-direction being located in a plane lying parallel to the probe holder plate, and a z-drive, for displacing the substrate carrier in a z-direction perpendicular to the probe holder plate, and wherein the displacement device is disposed outside the shield and the shield comprises an opening, which releases a displacement in the x, y, and z-directions, for passage of a connection of the displacement device to the substrate carrier.
6. Prober according to claim 1 wherein a unit generating a magnetic field in a substrate on the substrate carrier is connected to the prober.
7. Prober according to claim 6 wherein an electromagnetic coil generating a magnetic field in the substrate is disposed on the probe card.
8. Prober according to claim 6 wherein an electromagnetic coil generating a magnetic field in the substrate is disposed in the substrate carrier.
9. Prober according to claim 8 wherein the substrate carrier is entirely made of a non-magnetic material.
10. Prober according to claim 1 wherein the test probes are disposed on a probe card, and the probe card is encased by the shield.
11. Prober according to claim 10 wherein electromagnetic coils are disposed such that the coils enclose the test probes.
12. Prober according to claim 1 wherein part of the substrate carrier located below the test probes is made of a non-magnetic material.