SU793563A1 - Endoscope optical system - Google Patents

Description

(54) ENDOSCOPE OPTICAL SYSTEM

The invention relates to medical technology, namely to optical systems of endoscopes, and will be used in endoscopes for examining and photographing various cavities of biological channels of the human body. It can also be used in optical devices that perform similar functions in engineering.

The optical system of the endoscope is known, containing a head lens, a wrapping system and an eyebrow;

The disadvantage of such an optical system is that due to the implementation of each NC of the lenses of the wrapping system in the form of four-lens glueing, the design is complicated, the reliability is reduced, the loss of light increases, optical components are more accumulated, which ultimately also reduces image quality.

The closest technical solution to the invention is an optical

an endoscope system comprising a lens, symmetrical reversing systems, including a two-convex component and located on both sides of the last splicing of negative and rod-shaped meniscus, and an ocular p 2.

However, this optical system of the endoscope also has significant drawbacks:

- due to the orientation of the thin negative meniscus of the inverting system by the concavity to the corresponding image, a high degree of correction of aberrations (astigmatism and image curvature) is not achieved, which reduces the image quality of the optical system of the endoscope;

Due to the telescopic implementation of each reversing system, it is not possible to adjust the magnification under real conditions, which leads to a decrease in image quality;

- due to the fact that the intermediate image is inside the enveloping

25 of the system (near the surface of the two-convex collective) in the field of view of the endoscope are visible (inevitably present in the actual optical system) lens manufacturing defects (air bubbles, foreign inclusions, etc.) that are viewed by the observer under magnification. All this further reduces image quality.

The purpose of the invention is to improve the image quality by improving astigmatism aberrations and image curvature.

The goal is achieved by the fact that in the optical system of an endoscope containing a lens, symmetrical reversing systems that include a two convex component and are located on both sides of the last splicing of negative and rod-shaped meniscus, and the ocular, rod-shaped meniscus is made in the form of gluing from a convex the lens, the plane-parallel plate and the flat-bent lens, while the negative meniscus is located between the two-convex component and the flat-bent lens of the rod-shaped meniscus and executes n from beets, the refractive index of which exceeds, respectively, by 0.35-0.2 and by 0.05-0.2, the refractive indices of the flat-bent lens and the two-convex component.

The drawing shows the proposed endoscope optical system ..

The optical system of the endoscope contains a lens /, symmetrical reversing systems 2 and an eyepiece 3. The reversing systems 2 contain a two-convex component 4 and located on both sides of the last splicing of the negative meniscus 5 and the rod-shaped meniscus consisting of a convex-lens 6, a plane-parallel plate 7 and a flat-curved lens 5,: while the negative meniscus 5 is located between the two-convex component 2 and the flat-concave lens 8 of the rod-shaped meniscus and is made of glass, the refractive index of which This exceeds, respectively, by 0.35–0.5 and by 0.05–0.2, the refractive indices of lens 8 and the two-convex component 4.

When examining the lens / endoscope in front of the wrapping system 2, a reduced image of objects located inside the cavity under study is formed. This image is then successively transferred by the wrapping systems 2 using components 4-8 to the ocular shaft 3, through which the observer views the image under magnification.

The invention will find application in lens endoscopes for observing and photographing internal surfaces.

biological channels and cavities of the human body, as well as in optical devices that perform similar functions in technology.

The use of the invention will allow

improve the accuracy of medical research and improve the quality of diagnosis in the study of the internal surfaces of biological channels and difficult-to-reach human cavities,

Fore | Mula Invention

The optical system of the endoscope, which contains a lens, symmetrical reversing systems, including a two-convex component and located on both sides of the last splicing of negative and rod-like meniscuses, and an ocular, differing from

In order to improve the image quality by improving the correction of astigmatism aberrations and image curvature, the rod-shaped meniscus is made in the form of gluing from a convex lens, a plane-parallel plate and a flat-bent lens, while the negative meniscus is located between the two-convex component and the flat-curved lens, and the template has the same pattern. which exceeds, respectively, by 0.35-0.5 and by 0.05-0.2, the refractive indices of the flat-concave lyiza and the two-convex component.

Sources of information taken into account in the examination:

1. USSR author's certificate No. .520974, cl. A 61 B 1/00, 1971.

2 US Patent No. 2423267, cl. 350-45, publ. 1947 (prototype).

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Claims (1)

Claim The optical system of the endoscope containing a lens, symmetrical wrapping systems that include a biconvex component and located on both sides of the last splicing of negative and rod-like menisci, and an eyepiece, characterized in that, in order to improve the image quality by improving the correction of astigmatism and curvature aberrations image, the rod-shaped meniscus is made in the form of gluing from a convex-lens, a plane-parallel plate and a flat-concave lens, while the negative meniscus is located ezhdu biconvex lens component and a plano meniscus and the rod is made of glass whose refractive index exceeds respectively 0.35-0.5 and 0.05-0.2 refractive indices of plano-concave lens and lenticular component.