ENDOSCOPE LENS Russian patent published in 2014 - IPC G02B9/34 G02B13/00 

FIELD: physics.

SUBSTANCE: lens consists of two components separated by an aperture diaphragm. The first component with optical power φ_I comprises a meniscus with optical power φ_I,1, facing the image with its concave side. The second component with optical power φ_II comprises a plane-convex lens with optical power φ_II,1 and a glued lens with optical power φ_II,2. The first component in front of the aperture diaphragm includes a plane-convex lens with optical power φ_I,2, and the plane-convex lens of the second component is glued. The optical power of the lenses and components satisfies the following conditions: 0.25<|φ _I/φ|<0.35, 0.48<φ_II/φ<0.58, 0.3<φ_I,2/φ<0.4, 0.5<φ_II,1/φ<0.6, 0.05<φ_II,2/φ<0.15, where φ is the optical power of the lens overall.

EFFECT: providing good image quality in the entire measurement interval of the working section, smaller inclination angle of the main beam and high relative illumination at the edge of the image field.

1 dwg, 1 ex