Coarse flaw detector for printed circuit board inspection
US4707734A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30141
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for detecting flaws in printed circuit boards. The circuit board is scanned by a video camera to provide a serial stream of bits each indicative of a picture element within a particular scan line. The serial stream of bits is formulated into binary numbers each representative of a contiguous path of picture elements composed of n.times.n picture elements. Each of these binary numbers are compared with a corresponding one of a set binary numbers stored in memory representative of a perfect master printed circuit board. Failure of the printed circuit board to match the stored master indicates a flaw. The invention also includes means to generate overlapping patches to insure detection of defects which occur in adjacent patches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.