System for inspecting electrically conductive patterns such as a

Details System for inspecting electrically conductive patterns such as a System for inspecting electrically conductive patterns such as a

1992-07-24

1994-08-09

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

In vehicle wiring

324520, 324707, G01R 3100

Patent

active

053370040

ABSTRACT:
Electrically conductive patterns such as antenna patterns on window glass are inspected for a wire break or a short circuit. The impedances between an electrically conductive pattern and an electrically conductive layer on an inspective table are measured at predetermined frequencies, or the levels of signals reflected from the electrically conductive pattern are measured at predetermined frequencies. A decision unit determines whether the electrically conductive pattern is acceptable or not based on the frequency characteristics of the electrically conductive pattern and the reference frequency characteristics of a reference electrically conductive pattern.

REFERENCES:
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patent: 4409541 (1983-10-01), Richards
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patent: 4565966 (1986-01-01), Burr et al.
patent: 4712057 (1987-12-01), Pau
patent: 4743847 (1988-05-01), Frushour
patent: 4780661 (1988-10-01), Bolomey et al.
patent: 4905261 (1990-02-01), Knight
patent: 4939469 (1990-07-01), Ludwig et al.
patent: 5028866 (1991-07-01), Wiese

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