Compact keplerian optical system
US7719765B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2003 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Feb 5, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact Keplerian optical system includes a telescope having an image-rotator (Pechan roof prism pair), and an eyepiece and objective lens operative to form an intermediate image plane within the image-rotator, thereby decreasing the overall length. The objective lens optionally forms part of a replaceable cap, and plurality of replaceable caps may be provided, each with a different focal length to adjust for working distance. In the preferred embodiments, the eyepiece includes a singlet and a doublet lens to minimize eyestrain, and the objective lens includes a doublet and singlet field lens operative to increase depth of field and field of view. A practical implementation includes a pair of the telescopes, one for each eye of a user. Such a configuration may take the form of loupes mounted relative to eyeglass frames for surgical, medical or dental viewing applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.