SU764652A1 - Endoscope objective lens - Google Patents

Description

one

The invention relates to medical technology, namely optical diagnostic devices.

The endoscope lens is known, which contains a flat-bent lens, a me-5 nisk and a two-convex lens l.

However, this lens of the endoscope has drawbacks due to the implementation of the meniscus in the form of a single lens, which has quite a bit of 10 (5 corrective possibilities, which prevents the correction of spherical aberration and distortion.

The aim of the invention is to reduce spherical aberration and distortion.

The goal is achieved by the fact that the meniscus is made of glued together from negative and positive lenses the magnitude of the differences P9 of the holographic specimens and the coefficients of the average dispersion of glasses of which are respectively O - 0.02 and 22-23. and the noBepxHocTVf curvature of the splicing or gage, is 0-0.1 of the optical power of 6x1-1-25 wa.

FIG. i shows a schematic diagram of the object 1b of the endoscope; Id FIG. 2 - spherical aberra- graphics. and distortions.

The lens of the endoscope contains a flat-concave lens 1, a meniscus 2, and a double-convex lens 3.

Meniscus 2 is made of glued from lenses: negative lens 4 and positive lens 5, the magnitude of the times of the refractive index and (The coefficients of the average dispersion of glass are selected in the range of 0-0.02 and 22-23, respectively, and the curvature of the surface of the meniscus lens gluing is in the range of 0 -0.1 optical power lens.

By means of a flat-concave lens 1, meniscus 2, glued from negative and positive lenses 4 and 5 and a double-convex lens 3, the lens forms a small image: The object of endoscopic examination, which is transmitted by the renorse system, as well as its image. ), made in the form of, for example, a fiber optic cable to the proximal end of the endoscope, where it is viewed in an ocular (shown on the diagram).

In this case, the meniscus 2 is glued together from I negative and positive lenses 4 and 5 / the magnitude of the difference between the refractive indices and the coefficients of the average dispersion of glasses of which

selected between 0–0.02 and 22–23, respectively, and the curvature of the surface of the gluing of meniscus lenses within 0–0.1 of the optical power of the lens allows redistributing the effect of correction parameters and correcting spherical aberration and distortion.

Such a performance of the endoscope lens improves the operational properties of medical endoscopes, the benefit of correcting spherical aberration and distortion,.

An example. The Imbet endoscope lens has the following characteristics: Focus distance, mm.3

Relative hole i; 5 Angle floor 90

The design data of the endoscope lens is shown in the table.

000.45 1,5163 64.05 K8

2,3334,18

-6.5160.45 1.7550 27.52 TFB

w1.05 1.7424 50.23 STK9

-3.4040.30

6.5460.60 1.7550 27.52 TF5

3.0764.50 1.6130 60.57 TK14

Claims (1)

-8,472 Spherical aberration and distortion of the objective are given for a focal length of 1. And are shown as graphs (Fig. 2), where the dotted line indicates a known object, the solid one is proposed. The lens can be used in electronic endoscopes for visual research as well as for photo, film, and television filming. The use of a lens improves the quality of endoscopic examinations of the diagnosis and diagnosis of medical care. Claims of the endoscope lens comprising a flat-concave lens, a meniscus and a double-convex lens, characterized in that, in order to reduce spherical aberration and distortion, the meniscus is glued together "1 of the negative and positive lenses, the magnitudes of the refractive index differences and coefficients the average dispersion of the drains of which are, respectively, 0-0.02 and 20-23, and the curvature of the surface of the gluing of the meniscus lenses, soya-. Mounts 0-0.1 optical power-lens. Information sources, . taken into account in examination 1, German Application 2553395, Cl, G 02 B 13/04, 11.11.76 (prototype) ..  J