Method and apparatus for inspecting plated through holes in printed circuit boards
US4560273A · kind A · utility
30Cited by
4References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1983 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Nov 23, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/95692
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In inspecting plated through holes in printed circuit boards, light from a light source is introduced into the light conducting substrate of the printed circuit boards having through holes. A light detector senses the light in the holes. The detected through holes are masked to prevent the light from entering the through hole of the substrate. A light detector senses light leaked to the hole. By signals supplied from the light detectors, the plated through holes can be continuously and efficiently inspected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.