Compensating system for inspecting potentially warped printed circuit boards
US4978220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1988 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | May 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K13/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A compensating system for insepcting potentially warped printed circuit boards provides the insepction head of a printed circuit board inspection apparatus with a compensating device which is capable of detecting deviations in the printed circuit board which depart from a reference standard, for use in accurately compensating for such deviations during the board inspection procedure. An appropriate source (including ultrasonic, laser and directed light sources) is used to direct emissions toward the surface of a printed circuit board to be inspected. Detected reflections are then used to provide information useful in determining deviations of the surface of the printed circuit board from the reference standard, to adjust the anticipated locations for any component features, connecting leads or pins which are to be inspected within the subject viewing field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.