| 摘要 |
This invention relates to endoscopes of the kind incorporating a beam splitter for direct observation and joint observation by means of a folded optical system substantially larger in diameter than the endoscope or for connection of a film or television camera to the folded optical system. According to the invention, an opaque plate is mounted to face the folded optical system relative to the optical axis of a first part of said system in a tubular member the opaque plate having a small perforation arranged to pass light, the light spot of which is formed via a lens via the beam splitter via an achromatic lens with the image of the object in a common plane in a field lens and is guided together with the object image via the lens system of the folded optical system to an eye piece of the latter. |
