Vertical probe array having a tiled membrane space transformer
Vertical probe heads having a space transformer laterally tiled into several sections are provided. This change relative to conventional approaches improves manufacturing yield. These probe heads can include metal ground planes, and in embodiments where the ground planes are provided as separate metal plates parallel to the guide plates, the metal plates can also be laterally tiled into several sections. Such tiling of metal plates improves manufacturing yield and alleviates thermal mismatch issues. Probes are not mechanically connected to the space transformer, which facilitates replacement of individual probes of an array.
1. A vertical probe head comprising:
two or more vertically separated guide plates;
two or more vertical probes, wherein each of the two or more vertical probes is disposed in a corresponding set of holes in the two or more vertically separated guide plates;
a membrane space transformer configured to provide electrical contact between the two or more vertical probes and a test instrument;
wherein each of the two or more vertical probes has a base configured to electrically contact the membrane space transformer and a tip configured to electrically contact a device under test;
wherein the membrane space transformer is configured as two or more space transformer sections laterally tiled with respect to each other to cover a lateral area of the vertical probe array;
wherein the space transformer sections are configured to make contact with the bases of the vertical probes in a contact pattern that directly corresponds to a pattern of the vertical probes;
wherein electrical and mechanical contact between bases of the vertical probes and the membrane space transformer is a non-permanent pressure contact.
2. The vertical probe head of claim 1 , further comprising one or more metal ground planes.
3. The vertical probe head of claim 2 , wherein the one or more metal ground planes are configured as metal traces disposed on at least one of the two or more vertically separated guide plates.
4. The vertical probe head of claim 2 , wherein the one or more metal ground planes are configured as one or more metal plates disposed parallel to the two or more vertically separated guide plates.
5. The vertical probe head of claim 4 , wherein the one or more metal plates are each configured as two or more metal plate sections laterally tiled with respect to each other to cover a lateral area of the vertical probe array.
6. The vertical probe head of claim 1 , wherein one or more selected probes of the two or more vertical probes can be replaced without breaking or remaking a mechanical connection between the selected probes and the membrane space transformer.