endoscope

Abstract

The present invention provides an endoscope having an illumination unit capable of substantially uniformly illuminating the entire observation area of ​​a front view and a side view without obstructing a wide field of view. The endoscope has: a first objective lens (21), which enables The observation object in front of the insertion part 2 is imaged; the circumferential second objective lens (22) images the observation object on the side of the insertion part; the first light guide (31a) is arranged adjacent to the outer periphery of the second objective lens , guide the illumination light to the front end of the insertion part; the second light guide (32a), which is arranged on the base end side of the second objective lens, guides the illumination light to the front end of the insertion part; the lens (31) for front illumination, which consists of an annular The ring-shaped optical part (31b) and the light guide part (31c) are composed, the ring-shaped optical part is arranged in a manner surrounding the outer peripheral side of the first objective lens, and has optical directivity, and the light guide part makes the illumination light incident into the ring-shaped optical part. an optical part; and a lens (32) for side illumination, which includes a prism, the prism makes the illuminating light emit to the side of the insertion part, and emits a part to the front of the insertion part, the light guide part has a light incident surface (31d) and 2 One light reflection surface (31e), two reflection surfaces make the illumination light incident into the annular optical part.

Description

technical field [0001] The present invention relates to an endoscope capable of simultaneously observing a front view and a side view. Background technique [0002] In recent years, endoscopes have been widely used in the medical and industrial fields. An endoscope can observe inside a subject by inserting a long and thin insertion portion into the subject. And as the type of this kind of endoscope, for example, the direct-view endoscope in which the observation lens and the illumination lens are provided on the front end surface of the front end part provided on the front end side of the insertion part, and the front end part on the front end part of the insertion part Various types of endoscopes, such as side-view endoscopes in which an observation lens and an illumination lens are provided on a part of the side, have been put into practical use. [0003] In addition, in recent years, in order to expand the observation range, for example, in Japanese Patent No. 4955838, ...

AI Technical Summary

Problems solved by technology

However, in this configuration, illumination light from the rear may enter the side view lens, which may cause problems such as flare in the acquired image.

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