System for detecting selective refractive defects in transparent articles
US4606634A · kind A · utility
16Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1984 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Jul 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/958
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system of illuminating a transparent glass article, such as a TV faceplate, for detecting optical defects. The source of illumination is tailored so as to be space invariant and results in producing a plurality of collimated beams which travel in a continuum of different directions. A uniformly illuminated diffuser plate with a mask has the attribute of enhancing refractive defects of a given magnitude while not detecting those of a more gradual refractive nature. The object is viewed with a linear diode array camera of a given acceptance angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.