Endoscope apparatus

Details Endoscope apparatus Endoscope apparatus

1988-10-27

1989-08-15

Grieb, William H.

Surgery

Truss

Perineal

A61B 106

Patent

active

048564958

ABSTRACT:
A first optical adapter is to be detachably mounted on the distal end of an endoscope having an observation optical system and an illumination optical system, in which an aperture diaphragm which has been disposed at a given position within the observation optical system of the endoscope in the past, is disposed instead within an observaiton optical system of the optical adapter such that its optical axis is in agreement with that of the observation optical system for the endoscope. The optical adapter is selected from a set of adapters having different F numbers or the optical adapter is provided with a set of different F number diaphragms which are interchangeable. This enables the F number of the observation optical system of the endoscope apparatus to be changed by merely selecting the appropriate front optical adapter or diaphragm, depending upon brightness of the observation optical system, depth of field and brightness of an object being observed, as well as observation range and view angle of the observation optical system and the like, in order to obtain a clear observation image with optimum brightness.

REFERENCES:
patent: 4037938 (1977-07-01), Yamashita
patent: 4660982 (1987-04-01), Okada

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