Testing circuits on substrates
View Patent ↗The invention provides a method of testing a circuit on a substrate. Generally speaking, a substrate is located in a transfer chuck, a surface of a test chuck is moved into contact with a substrate, the substrate is secured to the test chuck, the test chuck is moved relative to the transfer chuck so that the substrate moves off the transfer chuck, terminals on the substrate are moved into contact with contacts to electrically connect the circuit through the terminals and the contacts to an electric tester, signals are relayed through the terminal and the contacts between the electric tester and the circuit, the terminals are disengaged from the contacts, and the substrate is removed from the test chuck.
1. An apparatus for testing circuits on substrates comprising:
a support frame;
a transfer chuck having a plurality of slots, each capable of holding a separate substrate;
a test chuck located on the frame and being movable relative to the transfer chuck so that surfaces of the test chuck move into contact with the substrates, the substrates being simultaneously securable to the test chuck, the test chuck being movable relative to the transfer chuck so that the substrates move off the transfer chuck;
a plurality of contacts secured to the support frame, the test chuck and the contacts being movable relative to one another so that the contacts contact terminals on the substrates; and
an electric tester connected to the contacts so that signals can be relayed through the terminals and the contacts between the electric tester and the circuit.
2. The apparatus of claim 1 wherein the transfer chuck has a plurality of ledges, opposing edges of each substrate being supported on a respective pair of the ledges, the surfaces of the test chuck being insertable between a respective pair of ledges when moving toward the substrates.
3. The apparatus of claim 1 wherein the test chuck has a suction passage in each surface, to which a vacuum can be applied so that the substrates are secured to the surfaces.
4. The apparatus of claim 1 wherein the transfer chuck has at least twice as many slots as the surfaces of the test chuck, the transfer chuck and the test chuck being movable relative to one another to align the surfaces of the test chuck with the slots.
5. The apparatus of claim 4 wherein the transfer chuck is movable relative to the frame.
6. The apparatus of claim 1 further comprising:
a thermal conditioning chuck capable of heating or cooling the substrates while held by the transfer chuck.
7. The apparatus of claim 2 further comprising:
a thermal conditioning chuck having a plurality of surfaces each being insertable between a respective pair of the ledges.
8. The apparatus of claim 1 wherein the test chuck includes a lower portion which is movable relative to the support frame and a first upper portion which is disengageably secured to the lower portion, the first upper portion having the raised and recessed formations.
9. The apparatus of claim 8 wherein at least one of the raised formations has a recess into which at least one of the substrates is located.
10. The apparatus of claim 9 wherein the first upper portion is configured to allow for interchangeability with a second upper portion that is to be disengageably secured to the lower portion.
11. The apparatus of claim 10 wherein the second upper portion further includes raised and recessed formations sized to accommodate at least one the substrates.
12. The apparatus of claim 11 wherein the second upper portion is configured to accommodate differently sized substrates.
13. The apparatus of claim 12 wherein the second upper portion is configured to accommodate at least substrate having a larger or smaller widths than the substrates secured to the first upper potion.
14. The apparatus of claim 10 wherein the first upper portion is configured to accommodate a first plurality of the substrates and the second upper portion is configured to accommodate a second plurality of the substrates having larger or smaller widths than the first plurality of the substrates.