Reflective optical system for a microscopic spectrometer
US5136422A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1990 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Oct 31, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/0096
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system for a microscopic spectrometer includes an objective, an inverse placed telescope for relaying the image formed by the objective towards a detecting element, and an optical element for focusing the relayed image onto the detecting element. In the preferred embodiments, the inverse placed telescope is disposed after the image plane of a Cassegrain objective, and a paraboloid mirror collects the relayed light from the inverse placed telescope to be focused into an image on the detecting element. The inverse placed telescope has a smaller shading coefficient than the Cassegrain objective, and the size of the image of the pupil of the Cassegrain objective is smaller than the diameter of the secondary mirror of the inverse placed telescope. The image of the shaded diameter in the preferred embodiment, which is caused by the secondary mirror of the Cassegrain objective, is greater than the shading diameter caused by the inverse placed telescope itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.