SU1691809A1 - Mirror binocular magnifying glass - Google Patents

Abstract

FIELD: optical instrumentation; used for binocular observation. The purpose of the invention is to improve the image quality by reducing astigmatism and increasing the working distance. The magnifying glass is made as a part of a positive meniscus bounded by spherical surfaces 1. 2 and a plane 3 on the entire surface 2. A mirror reflecting coating is applied on a part of surface 1. Increase 4. Relative hole 1-7,8. 1 hp f-ly, 3il.

Description

The invention relates to optical instrumentation, more specifically to simple-design loupes designed for binocular observation of objects.

The purpose of the invention is to improve the image quality by reducing astigmatism and increasing the working distance.

FIG. 1 shows a mirror magnifying glass, a slit; in fig. 2 - the same, side view; in fig. 3 shows a mirror loupe scan.

The elements of the magnifying glass are: a spherical concave surface 1 with an applied mirror stripe LED, a mirror 2, a flat exit face 3. The eye of the observer is placed in the exit pupil 4. Ci and C2 are the centers of the spherical surfaces 1 and 2, respectively.

A mirror magnifier is designed to observe an enlarged image of an object placed near the front focus of the magnifying glass. The central beam 00 (see Fig. 1) passes through the center of the object, is refracted on the concave surface 1 of the magnifying glass, then reflected from the mirror 2 aligned with the convex

surface of the prism, and again falls on position 1, on which it undergoes reflection, and through the flat face 3 of the prism is directed to the observer, the pupil of whose eye is located in the exit pupil of 4 magnifying glasses. A mirrored strip is needed to reflect the main beam, emerging from the extreme point of the object and falling to position 1 when reflected from it at an angle smaller than arcsln (1 / n).

From the scan of the mirror magnifier (see Fig. 3), it can be seen that the magnifier is built according to the telephoto lens scheme, i.e. contains positive and negative optical power components.

In the example of a specific embodiment, the magnifying glass is made of glass of the brand STK19. The front focal length is -62.5 mm, and the distance from the front focus to the first surface is 54 mm, i.e. almost equal to the focal length. The plane of objects should be inclined with respect to the central beam at 20 degrees. Other characteristics of the magnifier:

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Apparent increase in G 4 Krat Angular field in the space of images. 2 a) - 45 degrees Relative aperture 1: 7, 8 In the proposed loop, the presence of convex 2 and concave 1 reflecting surfaces (on the concave surface 1, total internal reflection occurs) allows to correct astigmatism for a certain field of view, since the astigmatism introduced by the convex surface is opposite to the sign of astigmatism introduced by the concave in the example of a specific embodiment, the correction of astigmatism is made for mm. If necessary, it is possible to obtain astigmatism correction for another Y value by slightly changing the curvature of the concave reflecting surface. one,

An increase in the vertical field of vision of the proposed loupe is achieved due to the fact that the beam falls on each surface no more than two times. In the calculated proposed loupe, the field of view is 50 mm.

The increase in distance from the object to the magnifying glass in the claimed structure is due to the fact that in the scan it is built according to the telephoto lens scheme, in which the collecting component is located in front of the scattering component. Such a construction of the system allows to increase the distance of the front focus, near which the object is located, from the first surface.

Claims (2)

1. Mirror binocular magnifier containing one component in the form of a positive lens with a mirror coating on the first and second spherical surfaces, characterized in that, in order to improve image quality by reducing astigmatism and increasing the working distance, the component is made in Hades parts of the meniscus, facing the concavity to the object, while the component is located entirely on one side of the axis of symmetry of the meniscus, the output surface the component of the magnifier is made in the form of a plane inclined to the axis of symmetry of the meniscus, the line of intersection of the first spherical surface of the component with its output flat surface is located closer to the axis of symmetry of the meniscus than the line of intersection of the second spherical surface of the component and its output flat surface, and a mirror coating on the second spherical surface of the component applied to the entire surface. 2. Magnifying glass according to claim 1, from the edge so that, with the aim of increasing the field of view in the meridian section, on the first spherical surface of the component, the mirror coating is applied in the form of a strip adjacent to the exit flat surface. WITH, 0 ± / 7 / 7SGSNOS / T70 / 7р 7ггел7О. fig i ABOUT , Output zrochoh Grain area / 7ONR / G77Ј / I LVMWM t sriе.2 hdd