Condenser for illuminating a ring field
US5361292A · kind A · utility
63Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | May 11, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K2201/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A series of segments of a parent aspheric mirror having one foci at at a si-point source of radiation and the other foci at the radius of a ring field have all but one or all of their beams translated and rotated by sets of mirrors such that all of the beams pass through the real entrance pupil of a ring field camera about one of the beams and fall onto the ring field radius as a coincident image as an arc of the ring field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.