Observation system with an endoscope
US5394499A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Dec 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An observation system for an endoscope has an entrance end face upon which an image is incident and an exit end face from which the image exits. The system comprises an image guide fiber of a very small diameter to allow transmission of the image, an object optical system arranged in front of the entrance end face of the image guide fiber, and a reproduction optical system arranged on the back side of the exit end face of the image guide fiber. The reproduction optical system is comprised of an eyepiece optical system and relay lens system. The maximal exit numerical aperture of the object optical system is greater than the maximal entrance numerical aperture of the reproduction optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.