SU683721A1 - Endoscope optical system - Google Patents

Description

one

The invention relates to the field of medical technology, namely, to the ontic systems of medical endoscopes used for inspecting and photographing human body cavities, and can be used in mediinskih devices for endoscopic studies in advanced medical facilities at amnioscopy , lanaroskonia and bronchoscopy.

The optical system of the endoscope is known, which contains a head lens consisting of negative and positive components, a wrapping system of rod-shaped lenses and an ocular p 1.

A disadvantage of the known optical system is that due to the lack of means in it eliminating or compensating for distortion, the image quality is not sufficiently high.

The aim of the invention is to improve the image quality by reducing distortion.

The goal is achieved by the fact that the optical system of the endoscope is equipped with a compensator, made in the form of a negative PLANE-CONNECTED and positive convex-flat lenses and located behind the wrapper of SistemoG at a distance not exceeding two diopters from focal plane. positive lens exceeds the refractive index of the negative lens by at least 0.2.

The drawing shows a schematic diagram of the optical system of the endoscope.

The optical system contains a first objective lens 1, consisting of a negative 2 and a positive 3 components, a wrapping system 4 and an ocular 5,

The system is equipped with a compensator 6, installed behind the wrapping system (J my 4 at a distance not exceeding two diopters from the focal plane of the ocular 5, made in the form of a negative 7 flat-concave and positive 8 convective lenses, the latter exceeding than on

-20 0.2 the refractive index of the negative lens 7.

Claims (2)

The optical system of the endoscope works as follows. The beams of rays from the object pass through the positive head lens 1, refracted on its negative 2nd positive 3 components, and are formed into an image. Further, the beams of rays pass through the () I turn back; the 4th system and the compensator t). refracted by the negative 7 and the newly isolated 8 lenses of the compensator 6. Due to the fact that the aberration properties of the optical surface depend both on the magnitude and sign of its curvature, and on the angles of incidence of the rays relative to the normals at the points where the rays meet the surface Beams of rays through negative 7 and positive 8 lenses reduce distortion and improve image quality. The image of the object is viewed under magnification with an ocular 5 or photographed with a photo attachment (not shown). Observing an object using the proposed optical system of the endoscope, which has improved image quality due to a decrease in distortion, allows, when conducting endoscopic studies, to get a correct idea of the geometric relationships between the object and its image, which, in turn, improves the accuracy of diagnosis and reduces study time. The invention The optical system of the endoscope, containing a head lens, consisting of negative and positive components, a wrapping system of rod-shaped lenses and an eyepiece, characterized in that, in order to improve image quality by reducing distortion, it is equipped with a compensator, made in the form of a negative flat-concave and positive convex-flat lenses and located behind the wrapping system at a distance not exceeding two diopters from the focal plane of the ocular, while refraction of a positive lens exceeds the refractive index of a negative lens by no less than 0, 2. Sources of information. Taken into account in the examination. Author's certificate of the USSR No. 517297, cl. And 61 In i / OO. 1973.