Methods for making plated through holes usable as interconnection wire or probe attachments
View Patent ↗Methods are provided for making plated through holes usable for inserting and attaching connector probes. In a first method, a curved plated through hole is formed by bonding curved etchable wires to a first substrate, plating the wires with a non-etchable conductive material, encasing the plated wires with a dielectric material to form a second substrate, planing the second substrate to expose the etchable wire, and etching the wires to leave plated through holes. In a second method, wires coated with a first etchable layer are initially bonded to a substrate, a second non-etchable plating layer is then applied over the first layer, and the first layer is etched away leaving plated through holes with wires disposed inside. In a third embodiment, a layer of masking material is initially deposited on a substrate and etched to form holes which are filled with a sacrificial fill material, the masking material is then removed, the fill material plated, grinding is performed to remove some plating to expose the fill material, and the fill material is then etched away leaving plated attachment wells. Probes may be attached to the plated through holes or attachment wells to create resilient spring contacts to form a wafer probe card assembly. A twisted tube plated through hole structure is formed by supporting twisted sacrificial wires coated with the plating material in a substrate, and later etching away the wires.
1. A probing apparatus, comprising:
a substrate;
a plurality of attachment wells extending from a surface of the substrate, each attachment well having an opening that extends into the well to the surface of the substrate and adapted to receive a resilient probe; and
a plurality of resilient probes, wherein each probe is inserted into the opening of a respective attachment well.
2. The apparatus of claim 1 , wherein the attachment wells are conductive.
3. The apparatus of claim 1 , wherein the resilient probes are soldered in the attachment wells.
4. The apparatus of claim 1 , wherein an engaging portion of each probe is inserted into the opening of a respective attachment cell, the engaging portion comprising a slot whereby the engaging portion is compressible.
5. The apparatus of claim 4 , wherein the engaging portion of each probe further comprises laterally protruding bumps configured to engage inside, side walls of a respective attachment well.
6. The apparatus of claim 1 , wherein the opening comprises a cavity within the attachment well and a passage to the cavity through an end of the attachment well opposite the surface, wherein a width of the passage is smaller than a width of the cavity.
7. The apparatus of claim 1 , wherein a contact portion of each probe extends out of a respective attachment well.
8. A probing apparatus, comprising:
a substrate;
a plurality of attachment wells on the substrate, a portion of which being adapted to receive resilient probes; and
a plurality of resilient probes, each inserted into a respective conductive attachment well, wherein the attachment wells are formed lithographically on the substrate.
9. A probing apparatus, comprising:
a substrate;
a plurality of attachment wells on the substrate, a portion of which being adapted to receive resilient probes; and
a plurality of resilient probes, each inserted into a respective conductive attachment well, wherein the attachment wells comprise a first opening and a second opening of a different size.
10. The apparatus of claim 9 , wherein the second opening is larger than the first opening.
11. The apparatus of claim 10 , wherein the second opening is adapted to receive an engaging portion of the respective resilient probe.