SU451037A1 - Wide-angle eye - Google Patents

Description

one

The invention relates to a wide-angle eyepiece with the removal of the pupil of the exit of a more focal distance and with a grid located in the plane of the zero aperture of the ocular.

Wide-angle oculi are known, containing a fixed negative collective located in front of the plane of the field diaphragm, and a partially mobile positive part located behind the plane of the field diaphragm and consisting of several components.

However, in such devices, due to the poorly corrected curvature of the field of view of the positive part of the ocular frame, it is impossible to arrange the grid with strokes at large field angles in the plane of its field diaphragm.

The proposed ocular p differs from the known ones in that the first component of the moving positive part is glued together from two positive and negative lenses between them, the last surface of which is made parabolic, the second component is a single two-convex lens, and the third component is made in the form of a two-glued positive meniscus, concavity to the eye, and the optical powers of the collective and the movable part are respectively 0.4 | F1 | 0.5 and F2 0.75.

This allowed us to get the angle of the field of view.

2

2 p - 70 °, a relative aperture of 1: 4.5, removal of the exit pupil of a more focal length, and image quality allowing the placement of a grid with strokes in a plane

field diaphragm within at least 2./3 of the field angle and ensure the convergence of the rays behind the ocular within ± 5 diopters at a focal distance of / - 25 mm. The drawing shows the optical scheme.

proposed ocul

The oculare consists of a motionless negative collective 1, located in front of the plane of the field diaphragm 2, and a moving positive part 3. This part, located behind the field diaphragm, consists of six lenses, forming three components. The first component is glued together from two positive lenses 4 and 5, made of glasses with refractive indices within

1.65-1.68, and the dispersion in the range of 46-60, between which a double-curved lens 6 made of glass with a refractive index greater than 1.72 and a dispersion less than 28.5 is placed, the latter being convex on the surface of the component

made paraboloidal. The second component is a simple two-convex glass lens 7 with a refractive index greater than 1.7. The third component is a positive meniscus, facing

concavity to the eye, glued from a double convex lens 8 and a double lens 9 with a refractive index greater than 1.65 and a dispersion difference less than 25, with the focal length and component at least 0.8 of the focal length of the ocular.

The distance from the first surface of the movable part 3 to the back surface of the collective 1 makes it possible to place a plane-parallel plate 10 with a grid and to dry it, and the movement of the part 3 of the eye can be changed to change the beam angle behind the ocular within ± 5 diopters.

The calculated example of an ocular has a field of view, a relative aperture of 1: 4.5, and a pupil removal of output 1.14 with a focal distance equal to 1. In the example, the relative optical powers of the negative collective 1 and the iodine of the positive part 3 are respectively 494 and 736 .

Subject invention

A wide-angle eye, consisting of a fixed negative collective, glued together with positive and negative lenses, located in front of the plane of the field diaphragm, a moving positive part consisting of six lenses combined in three components, and a mesh, characterized in that, in order to remove the pupil of the exit of a more focal distance, an improvement in the correction of aberrations in the plane of the field diaphragm and the simultaneous preservation of the correction in the front focal plane of the whole eyepiece, the first component of the moving element and the This part is glued from two positive and negative lenses between them, the latter having a parabolic surface, the second component is a single two-convex lens, and the third component is made in the form of a double-glued positive meniscus facing concavity to the eye, and the optical forces of the team and the mobile part respectively 0.4 | f11 0.5 l, 75.