OPTICAL SYSTEM OF ENDOSCOPE Russian patent published in 2002 - IPC

FIELD: medical equipment. SUBSTANCE: optical system of endoscope includes objective lens, eye-piece and negative collecting lens. System is based on telescopic arrangement with negative collecting lens installed in front of objective lens. Focal distance and clear aperture of collecting lens conform to relations specified in formula of invention. Telescopic system of endoscope can also include prism or mirror to ensure potential for change of observation direction. Invention provides for expansion of angular filed of vision of endoscope which allows long focal-length lens to be used in mix of endoscope and length of endoscope to be increased. EFFECT: expanded angular field of vision of endoscope. 4 dwg