OPTICAL SYSTEM OF ENDOSCOPE Russian patent published in 1997 - IPC

FIELD: optical instrumentation, rigid endoscopes. SUBSTANCE: optical system has endoscope objective lens 1, prism erecting system 2 composed of two plano-convex rod-like lenses 9, two rod-like plano-convex lenses 10 placed on both sides of them. Lenses 9 and 10 face one another with convexities. System also includes compensating plane-parallel plate 3, eye- piece 4 and exit pupil 5 of endoscope. Compensating plane-parallel plate 3 is cemented from plano-concave lens 11 and convex-plane lens 12. EFFECT: facilitated manufacture, enhanced operational reliability. 5 dwg