Focusing endoscope

Abstract

The invention provides a focusing endoscope, and the endoscope comprises an objective lens case, a focusing screw rod, a camera holder, a rotating element, and a focusing operating part. The objective lens case is arranged to be opposite to the camera holder, and a projection part of the objective lens case is movably disposed on the camera holder. The focusing screw rod passes through the objective lens and the camera holder. One end of the rotating element is connected with the focusing screw rod, and the other end of the rotating element is connected with the focusing operating part. When the focusing operating part drives the rotating element to rotate, the rotating element drives the focusing screw rod to rotate. When the focusing screw rod rotates, the objective lens case is driven to move. According to the invention, the endoscope can achieve the moving operation of a lens or a lens group under the condition that an insertion pipe of a flexible endoscope is bent, thereby achieving the focusing or zooming function, and achieving the miniaturization of the diameter of an insertion part of the endoscope.

Description

technical field [0001] The invention relates to the technical field of endoscopes, in particular to a focusing endoscope. Background technique [0002] Endoscope is a precision instrument combined with fiber optics and optics, precision machinery and electronic technology. It has a wide range of uses and important roles in various fields of national economy such as medical treatment, industry and military. [0003] When the endoscope is in use, the distance between the observed object and the endoscope lens end is very different under different working conditions. Sometimes it needs to be observed very close, and sometimes it needs to be observed from a long distance. [0004] The head end of the endoscope in the prior art, because its built-in optical system is set, its depth of field is adjusted to different depth of field ranges during assembly, but it is fixed after adjustment and cannot be changed again. It cannot be changed while in use. Therefore, at present, optic...

AI Technical Summary

Problems solved by technology

However, the correct replacement head must be selected for each use, otherwise the endoscope has to be pulled out from the working condition, and then inserted for observation after replacing the replacement head, which brings great inconvenience to the use

It is even more troublesome when you encounter several different working conditions at one time

Moreover, an endoscope needs to be equipped with replacement heads with different depth of field ranges, which is expensive

[0006] There is also a solution, such as a zoom endoscope provided by CN201620590716 and US7961401B1. The size of the zoom structure is relatively large, which is not conducive to the miniaturization of the diameter of the insertion part of the endoscope, thus greatly restricting the working conditions

Moreover, how to achieve reliable zoom operation when the insertion tube of the flexible endoscope is bent, the current solution is to use a built-in micro-motor at the end of the endoscopic lens, which is not only costly, but also limited by the technical development of micro-motors. It is difficult to reduce the diameter of the insertion part of the endoscope

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