OPTICAL SYSTEM OF ENDOSCOPE Russian patent published in 1995 - IPC

FIELD: optical instrument engineering. SUBSTANCE: optical system of endoscope has head objective 1, and erecting systems 2-4. Each erecting system has two identical biconvex rod lenses 6 and 7, between which the correction member is disposed. The system also has eye-piece 5. Correction member is made of two identical glued components 8 and 9, which have biconvex and biconcave lenses 10, 11 and 12, 13 correspondingly. The lenses are disposed symmetrically to aperture diaphragm 14. Lens erecting system is introduced in front of eye-piece by means of mirrors 15 and 21. The last erecting system is formed by two identical glued lens components 16 and 17, which components have negative meniscus 18, which is turned with its concavity to aperture diaphragm. The components also have biconcave lens 19. Meniscus 18 and lens 19 are disposed symmetrically to aperture diaphragm 20. EFFECT: improved efficiency of operation. 3 cl, 3 dwg