Disposable rigid endoscope

摘要

An endoscope is provided with an objective lens system, an ocular lens and an intermediate relay lens system. The relay lens system is a hybrid system using both plastic and glass elements. The plastic elements comprise an even plurality (N) of axially aligned lenses each having a length of the same order as its diameter. Intermediate said plastic lenses are a plurality (N minus 1) of axially aligned glass plano cylinder, the end faces of which are polished.