07-11-2013 дата публикации
Номер: US20130296649A1
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 , 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 and a rear sub-systems seperated 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 (optionally, a compound 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 focal length of the total lens system and fis the focal length of said first rear positive lens.'}2. The optical system according to claim 1 , wherein said front sub-system further comprises an additional front meniscus lens disposed between said first front negative ...
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