Phosphor glow testing of hybrid substrates

Details Phosphor glow testing of hybrid substrates Phosphor glow testing of hybrid substrates

1990-06-21

1991-08-13

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 731, 324158R, 324514, G01R 3112

Patent

active

050399381

ABSTRACT:
An apparatus for testing hybrid substrates having a large number of networks and pads. The apparatus includes a DC power supply and a vacuum chamber. The vacuum chamber is equipped with a hot-filament electron source, and this electron source is electrically connected to the negative terminal of the DC power supply. The vacuum chamber is also equipped with a movable probe for making electrical connections from the positive terminal of the DC power supply to any one of the pads on the substrate. A small amount of phosphor of a type that glows when bombarded by electrons is placed on each pad of the substrate to be tested. The substrate is placed in the vacuum chamber for testing. The probe is brought into contact with one of the pads on the substrate, and a voltage in the order of 100 volts is applied between the electron source and the probe. Pads that are electrically connected to the probed pad act as anodes, thus attracting the electrons from the electron source, and are identified visually by the glow of the phosphor.

REFERENCES:
patent: 4507605 (1985-03-01), Geisel
patent: 4771230 (1988-09-01), Zeh
patent: 4841242 (1989-06-01), Brunner
patent: 4843329 (1989-06-01), Beha et al.
patent: 4868492 (1989-09-01), Beha et al.

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