26-01-2017 дата публикации
Номер: US20170023787A1
Принадлежит:
There is provided herein an optical system for a tip section of a multi-sensor endoscope, the system comprising: a front-pointing camera sensor; a front objective lens system; a side-pointing camera sensor; and a side objective lens system, wherein at least one of said front and side objective lens systems comprises a front and a rear sub-systems separated by a stop diaphragm, said front sub-system comprises, in order from the object side, a first front negative lens and a second front positive lens, said rear sub-system comprises, in order from the object side, a first rear positive lens, an achromatic sub-assembly comprising a second rear positive lens and a third rear negative lens, wherein the following condition is satisfied: f≦1.8f, where f is the composite focal length of the total lens system and fis the focal length of said first rear positive lens. 1. An optical system for a tip section of a multi-sensor endoscope , said optical system having an object side proximal to an object being viewed and an image side proximal to where an image is formed , the system comprising:a front-pointing camera sensor;a front objective lens system;a side-pointing camera sensor; anda side objective lens system,wherein at least one of said front and side objective lens systems comprises a front sub-system and a rear sub-systems separated by a stop diaphragm,wherein said front sub-system comprises, in order from the object side, a first front negative lens and a second front positive lens, wherein the first front negative lens is oriented with a concave surface facing the image side and the second front positive lens is a plano convex lens,wherein said rear sub-system comprises, in order from the object side, a first rear positive lens, an achromatic sub-assembly comprising a second rear positive lens and a third rear negative lens, wherein the following condition is satisfied:{'sub': (first rear positive lens)', '(first rear positive lens), 'f≦1.8f, where f is the composite ...
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