Method and apparatus for optical inspection of transparent articles
US4620090A · kind A · utility
14Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1985 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Jan 15, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and an apparatus for optical inspection of transparent articles. The method and apparatus use a light beam scanning field which is separated into at least two portions. The field portions are directed at the article at differing angles of incidence such that they eliminate blind spots caused by portions of the apparatus which block the passage of the light through the article. A feature of the invention is its provision of a folded optical path to increase the length the beam travels between the beam generator and the object beyond the physical distance between the beam generator and the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.