ENDOSCOPE OBJECTIVE LENS

WIPO Patent Application WO/2013/002681

A3

The endoscope objective lens is used in the field of endoscopy for examining human internal organs and, more specifically, in video endoscopy. In the endoscope objective lens which is comprised of two components separated by an aperture diaphragm, the first component I having an optical power φ1 and comprising a negative meniscus lens, the concave side of which faces the image, and a plano-convex lens with an optical power φ2, and the second component II having an optical power φII and comprising a cemented lens with an optical power φ3 4, which consists of a negative and a positive lens with optical powers φ3 and φ4, the first component I has a negative optical power, and the second component II has a positive optical power, and a double-convex lens with an optical power φ5 is provided in front of the cemented lens in the second component II. The optical powers of the lenses and the components satisfy the following conditions: 0.35<|φ1 / φ|<0.45 0.5<φιι/ φ <0.6 0.35<φ5|<0.5 0.15<φ2<0.25 0.65<|φ3/ φ4|<0.75 0.97