Liquid crystal electric field tester for circuit boards
US5311137A · kind A · utility
6Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1993 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Jan 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133345
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A nondestructive noninvasive device and method for testing printed circuit boards (PCBs) through the utilization of a liquid crystal material which visually images the electric fields of the PCBs. Circuit faults resulting in a change of current flow in a PCB produce recognizable changes in observed electric fields. The present invention may be used in a stand-alone mode or as a supplement to other testing techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.