OBJECTIVE LENS FOR AN ENDOSCOPE AND ENDOSCOPE

Abstract: the objective lens for an endoscope consists of, from an object side to an image side, a first lens group having positive optical power and a second lens group having positive optical power. during focusing, only the second lens group moves. the first lens group includes a single lens that has negative optical power closest to the object side. the objective lens for an endoscope satisfies conditional expressions determined in advance related to a maximum image height, a focal length of a whole system, a maximum half angle of view, a focal length of the first lens group, a focal length of the second lens group, and a focal length of the single lens of the first lens group.

Inventors:

Tomoyuki BABA of Saitama JP

CPC Classification:

A61B1/0019: {characterised by variable lenses}

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