Method and apparatus for detecting neck disconnection between land and line of wiring pattern on printed board
US5398291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1991 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Nov 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V2201/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting neck disconnection between a land and a line in a wiring pattern on a printed board includes a scanner for obtaining images of the wiring pattern and a through hole formed in the pattern. The image of the wiring pattern is converted to a line image representing a wiring line by thinning the pattern image. A window encompassing the image of the through hole is defined, and part of the thinned pattern image overlapping the window is extracted. The number of end points of the thinned pattern image is counted in the window. If the number of the end points is an odd number larger than one, it is determined that neck disconnection is present in the wiring pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.