Compact optical system
US4411499A · kind A · utility
11Cited by
15References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1980 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Nov 7, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/0884
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved, compact optical system comprising a concave primary mirror and a convex secondary mirror. The primary mirror converges radiation to the secondary mirror. The secondary mirror comprises a lens having a first and a second surface. The second surface is coated with reflective material. The radiation received by the lens is refracted at the first surface, reflected back from the second surface, and then refracted once again by the first surface. The first and second surfaces have a shape for providing control of field curvature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.