SU1691807A1 - A concentric objective - Google Patents

Description

The invention relates to an optical instrument and m. used in wide-angle, periscopic devices, in particular, with fiber-optic elements, the purpose of the invention is the expansion

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functionality by improving the direct image of the object is achieved by installing a rectangular prism with a hypotenuse edge on the plane of the inner objective lens, located at an angle of 45 ° to the sighting axis. The center of curvature of the spherical surfaces and the center of the aperture diaphragm are located at the point of intersection of the optical axis of the device with the edge of the right angle of the prism. A mirror coating is applied to the working faces of the prism, the prism and the inner objective lens are made of the same material. one

zp f-ly, 2 ill.

The invention relates to optical devices that form the image, namely, concentric lenses, and can be used in optical instrumentation for constructing diagrams of wide-angle, periscopic devices, in particular, with fiber-optic elements.

The aim of the invention is to expand the functionality by obtaining a direct image of the object.

FIG. 1 shows a principal optical scheme of a concentric lens, a section; in fig. 2 is a section A-A in FIG. one.

The lens consists of two lens components 1, 2 and a prism 3, glued together in a single unit. The design of the concentric lens with a prism in the form of a single unit significantly increases its reliability in operation.

The action of a rectangular prism 3 on the course of the rays, set as described

above - equivalent to the action of a rectangular prism with two reflections, allowing to provide a 90 ° bend in the course of the rays and to get a direct image after the lens.

The location of the center C of the curvature of spherical surfaces and the center of the aperture diaphragm on the edge of the right angle of the prism 3 makes it possible to obtain a strictly symmetric concentric system. The implementation of the prism 3 and the inner lens 2 of the system from the same optical material and the fact that the prism scan is a plane-parallel plate allows the main beams of the beams to pass through this system without refraction. The main rays have the properties of a beam going along the optical axis. Axial and oblique tufts are identical. The aberration correction is reduced to the correction of spherical, spherochromatic aberration. Aberrations of oblique wide beams, acIV Ζ081691 "” P5

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1691807

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tigmatism, distortion, coma, chromatism increase in such a system is 0, which makes it possible to calculate a concentric lens with a large angular field (about 120 ° or more) and good image quality throughout the field.

Despite the large angular field, the dimensions of the prism 3 are minimal, since it is located near the aperture diaphragm of the concentric lens.

Claims (2)

Claim 1. Concentric lens containing one or N lens components, the centers of curvature of the spherical surfaces of which coincide, and one of the components contains a reflective surface located to the optical axis at an angle of 45 ° and passing through a common center of curvature of spherical surfaces, characterized in that the purpose extending the functionality by obtaining a direct image of the object, the reflecting surface of the lens component is made in the form of a rectangular prism with a specular reflective coating on the working faces, the hypotenuse face of which is aligned with the flat surface of the internal lens component, while the edge of the right angle of the rectangular prism is placed in the plane of the optical break axes and passes through the common center of curvature of spherical surfaces, and a rectangular prism and the inner lens combined with it component made of the same material. 2, the Lens according to claim 1, except that, in order to reduce the size and increase reliability in operation, all the lens components and the prism are glued together in a single unit.