Fast, aberration-free flat field catadioptric telescope
US4881801A · kind A · utility
Inventor
Key dates
| Filing date | Jan 11, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jan 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to Catadioptric Telescopes having concave spherical mirror reflectors as the primary objective and a refractive correction element for reducing the spherical aberration of the primary mirror, and more particularly to a fast, aberration-free flat field telescope employing a spherical primary mirror and unique sub-aperture sized corrector made preferably of one plano-concave lens element and one plano-convex element both of the same kind of glass. This unique corrector also simultaneously corrects aberrations of the primary including its field curvature. The telescope requires no aspherics and is capable of easy adaptation to a Newtonian style configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.