System for illuminating an annular field
US4241390A · kind A · utility
49Cited by
6References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Feb 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B19/0028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to a system for illuminating an annular field disposed about an axis characterized by an arcuate source of radiation disposed concentrically about the axis, and an annular field imaging system having an axis of symmetry coincident with said axis for forming an image of the arcuate source on the annular field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.