Apparatus for detecting defects of wires on a wiring board where

Details Apparatus for detecting defects of wires on a wiring board where Apparatus for detecting defects of wires on a wiring board where

1997-01-07

1998-12-01

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055945, 25055946, 250225, 356237, G01N 2186

Patent

active

058442499

ABSTRACT:
A detecting apparatus capable of supporting even narrow wire widths and of detecting defects of wires in a non-contact manner is provided. The detecting apparatus comprises an optical sensor, a sensor head, and a signal processing unit. The optical sensor comprises a transparent substrate, a transparent electrode disposed on the transparent substrate, a thin film of a polymer non-linear optical material disposed on the transparent electrode, and a reflective film disposed on the thin film, and is positioned in close approximation to and without contacting an electrode to be measured on the wiring board. The sensor head comprises a light source, optical means for guiding light from the light source into the optical sensor, and detecting means for detecting reflected light from the optical sensor. The detecting means supplies the signal processing unit with a signal corresponding to the intensity of the reflected light when the electrode on the wiring board is applied with a voltage.

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patent: 5715052 (1998-02-01), Fujino et al.
patent: 5717198 (1998-02-01), Broude et al.

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