SU106826A1 - Mirror-lens optical system for viewing objects - Google Patents

Description

The subject of the invention is a mirror-lens optical system for viewing objects intended for use as a magnifying glass, an ocular, a lens, a viewfinder, etc.

A feature of the proposed system is a small number of surfaces bordering the air, and a high image quality with a large viewing angle.

The system is shown schematically in FIG. 1 and is a concentric lens, the convex surface of which is a spherical mirror. The lens is cut into two parts by a plane with a semi-reflective coating. The pupil of the system is located at the center of curvature of both surfaces.

In the case of using the system as a magnifying glass or ocular, a transparent object or primary image is given by an external system, located on the outer flat side of the PP part. The rays from the object or primary image are reflected sequentially from the semi-reflective flat mirror and from the spherical mirror. through the latter along the rays of the surface of the part 2 and get a parallel beam into the pupil of the observer.

In the case of using the system as a wide-angle short-focus lens, a diaphragm 3 is placed in the center of the curvature of the surfaces, which is the aperture diaphragm of the system, and the image is obtained on a flat surface PP.

Filling the space between the spherical mirror and the object with a medium with a large unit refractive index, as well as the introduction of a negative spherical surface, makes it possible to carry the pupil of the system far away from the latter surface, JTO is very important for the case of strong loops or oculi.

FIG. 2, 3, 4 and 5 the same system is depicted in somewhat modified form to increase the luminance of the given image.

No. 106826-2 -

In the horizontal meridian of GG (Fig. 2), the fume system is a co-centric lens, the convex surface 4 of which is a spherical mirror QM.

In the vertical section meridian, the system has a spherical mirror 5 of the same radius of curvature as mirror 4.

For focusing, a lens with a surface b (Fig. 3) and an air gap separating it from the surface 7 is separated from the thickness of the material.

The system can also be used as a micro-lens (Fig. 4), for which the object is placed in the center of the curvature C of the mirror 8, and the surface 9 is made so curvature that the image is obtained at the required distance.

By changing the ratios of the structural elements, a telescopic system of low magnification is achieved without an intermediate image (Fig. 5).

Subject invention

Claims (8)

1. Mirror-lens optical system for viewing objects, designed to be used as a magnifying glass, eye-lens, lens, reticle, etc., and made in the form of a body of transparent material with a refractive index of a larger unit, bounded by three external optical surfaces, two of which are refracting, and a third - reflective - in the form of a spherical reflecting inside the body of the mirror, behind which a translucent reflective plane is installed for the kink of the optical axis, characterized by the fact that the refractive surface be disposed on the part of the pupil of the system, it is concave, spherical or planar. 2. The form of the system according to claim 1, characterized in that the refractive surface located on the pupil side of the system is designed as a concentric surface of a spherical mirror. 3. The form of the system according to claim 2, characterized in that the pupil of the system is located in a plane passing through the curvature centers of both surfaces. 4. The form of the system according to claim 1, characterized in that the pupil of the system is located in a plane passing through the centers of curvature of the spherical mirror. 5. Mirror-optical lens system for PP. 1-4, characterized in that the refractive surface facing the object or in the opposite direction to the image is made spherical or flat. 6. The form of the optical system on PP. 1-5, characterized in that, in order to reduce the light losses, it uses a second spherical mirror located symmetrically with the first mirror relative to the semi-reflective surface and having equal surface curvature with it. 7. The form of the optical system in PP. 1-6, characterized in that, in order to focus the system, as well as correct the aberration, an additional lens is installed between the pupil and the system itself. 8. The form of the optical system in PP. I-7, characterized in that, in order to use the system as a sighting device of a mirror photographic camera, the flat surface of the system body facing the object is made opaque.