SU909655A1 - Telescopic system - Google Patents

Description

one

This invention relates to an optical instrument. A telescopic system can be used in devices designed to transmit the angle of biasing and in devices designed to control internal surfaces.

Known telescopic systems used as endoscopes are designed to control the internal surfaces of objects 1.

The disadvantages of the known telescopic systems are the small removal of the entrance pupil, the smaller field of view angle, and they also do not provide the required image quality.

A known telescopic system comprising an objective lens, an ocular and an intervening system located between them, made in the form of two positive plane-convex lenses, the first of which faces the plane to the lens, and the second - to the ocular axis with

2

between them installed compensator 23.

This device does not provide the required image quality due to uncorrected chromatism and astigmatism.

The purpose of the invention is to improve the image quality.

The goal is achieved by the fact that in a telescopic system containing a lens, an eye-piece and a wrapping system located between them, made in the form of two positive plane-convex lenses, one of which faces the plane to the lens, and

15 second - to the ocular ru with a compensator installed between them; the wrapping system is provided with an additional two flat-convex lenses facing flat surfaces to

2Q compensator, made in the form of two identical double-bent negative lenses and a positive lens between them, glued together from a two-convex lens with the same radii, and two identical negative meniscus faces symmetrical to the two-convex lens, and the difference between the refractive indices of the materials of the two-convex lens and the negative meniscus does not exceed 0.05, and the difference of the dispersions is greater than 1b. The drawing shows the optical scheme of the telescope eskoy system. The optical design consists of 13 lenses combined into 11 components.

Claims (2)

The telescopic system represented between them is a wrapping system, made up of a symmetric scheme, with the aperture of a flat-convex lens in the middle of which is two positive, the first of which is located in the aperture. Components 1 and 2 are made in the form of plane-convex lenses that are convex to the aperture diaphragm. Components 3 and 4 are made up of positive lenses that are convex to the object and image spaces, respectively. Components 5 and 6 are made in the form of plano-convex lenses convex to the aperture diaphragm. Components 7 and 8 are made in the form of plano-convex lenses that are convex to the spaces of the object and the image, respectively. Components 9 and 10 are double bent negative lenses. The introduction of these lenses makes it possible to correct the spherical aberration of inclined beams. Component 11 is a positive lens, glued together from a two-convex lens with the same radii, made of crown glass, and two identical negative menisci, made of flints of glass, facing each other in concavities and positioned symmetrically relative to the two-convex lens , moreover, the refractive index difference of kroon and flint glasses is not more than 0.05 and the difference of dispersions is greater than 16. Thus, the telescopic system due to the combination of the introduced features has improved image quality, in particular, the spherical aberration of the axial beam of the system does not exceed the DA, the spherical aberration of the inclined beams across the field is 2. Claims of the invention A telescopic system comprising a lens, an eyepiece and a plane facing the lens, and the second to the eyepiece with a compensator installed between them, in order to improve the aberration correction, the wrapping system is additionally equipped with two flat convex lenses facing flat surfaces to a compensator made in the form of two identical double-concave negative lenses and a positive lens interposed between them, glued together from a two-convex lens identical radii, and two identical negative meniscus facing concavity E to each other and symmetrically with respect raspolo- conjugated biconvex lens, the refractive index difference between the materials biconvex lens and a negative meniscus does not exceed 0.05, and the difference of the dispersions 1b longer. Sources of information taken into account in the examination G. Bychkov OD Control of internal surfaces. M., 1975, p. 86-90. 2. USSR author's certificate №, cl. G 02 B 23/00, 1978 (prototype).