SU1700516A1 - Reproduction lens - Google Patents

Abstract

The invention relates to optical instrument making, namely, to lens reproduction lenses. It can be used in devices for orthoscopic photographic reproduction of an organic lens: in the form of whose area of the specter. Target 13 °. Increased quality of imaging while simultaneously atherguric populations. It has two groups of lenses 1 and 2, sect., - Hbi snepTypf v (diaphragm 3) Each: a group contains flat-and-sojoid plates I and 19 5 6 m, 17,18 half-eyed Ie and the facing CTS Experimental Digfrch 3, 7, 5 — ODN-1, two go / clave lenses, S. 13 two-lens lenses, 3 official 9 and 15 liters of posterior meniscus 14 and 10 facing concavity to the diaphragm 11 and 12 - D-concave lichgy Chislova aperture A - 0.4 linear field 2y 13 mm, working segment S 12 mm 1 sludge

Description

This invention relates to an optical instrument making, namely to lens reproduction lenses. It can be used in devices for orthoscopic photographic reproduction of originals in the visible region of the spectrum.

The aim of the invention is to improve the image quality while simultaneously increasing the aperture.

The drawing shows the optical scheme of a reproduction lens with design parameters.

The reproduction lens consists of two components 1 and 2, separated by an aperture diaphragm 3, successively located along the beam, each of which is composed of lenses. Plano-parallel plates 4 and 19 are located respectively in front of the plane of the object and the image. Lenses 5, 6 and 17, 18 are positive menisci that are convex to the aperture diaphragm, 7 and 16 are single two-convex lenses, 8 and 13 are duplex positive lenses, spacing from negative and positive menisci respectively 9 10 and 14.15 converted by gchuto Tew to the diaphragm 11 and | 2 FEB kovog ie pull the lens

The reproduction lens projects the orthogonal and orthoscopic plane of the pre-bursa image plane. The rays exit - the object bounds fall onto the flat plate, the plate 4 reaches the meniscus 5, the component 1 is refracted by the lens, and the diaphragm 3 is refracted by lenses 2 and reached the planes of the image are not the same

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As a concrete example, a reproduction lens with the following optical characteristics is presented: Linear magnification / 3 -1 Chislov aperture A -0.4 Linear field 2 13 13 mm Distance from the object plane to the image plane L 150 mm Working segment S -12 mm First positive meniscus 5 is made in the form of a thick positive meniscus convex to the aperture diaphragm 3, its thickness of 0.14 f about chosen experimentally and due to the correction of the spherical aberration of the third and highest order for a point on the axis coma of the optical system with increasing aperture and spherical aberration over the field for wide oblique ray beams. The use of a glued positive component in the form of a meniscus 9, facing concavity towards the aperture diaphragm, makes it possible to correct the astigmatism and curvature of the image.

In the present version of the calculation, the reproduction lens has the following aberrations with the numerical aperture A = 0.4.

The longitudinal spherical aberration for the whole spectral region does not exceed 0.076 mm, and for the main wavelength is 0.026 mm. The transverse spherical aberration for the main wavelength is equal to L d d (mm) 1.0 0.011 0.866 0.0003 0.707 -0.004 0.5 -0.002

The chromatism of the position does not exceed 0.019 mm. Image curvature and astigmatism in the field are equal to:

margin of –6.4; z i 0,056 mm, Z s 0,020; Zs - 2 l -0.036; zone y –4.2; Z t 0.32 mm; Zs -0.001; Z s -Zt -0.033.

The illumination at the edge of the image is 100%, the lens is corrected for Ao 0.65 mm. The achromatization area A 0.58-0.72 microns. This design allows you to get a reproduction lens with a larger numerical aperture, with improved image quality throughout the field.

The optical design of the lens is technological, since consists of identical single lenses in two components and two glued lenses. In addition, due to the symmetry of the lens components relative to

the aperture diaphragm plane of the resulting reproduction lens is less sensitive to assembly and adjustment errors, as well as to mechanical deformations in the devices.

Claims (1)

Invention A reproduction lens containing two symmetric lens groups separated by an aperture diaphragm, each which contains a plane-parallel plate, the first and second positive menisci convex to the aperture diaphragm, a two-convex lens, a double-curved lens, and a positive glued component, the first lens of which is made in the form of a negative meniscus with a concavity facing the aperture diaphragm, characterized in that, in order to improve the quality image across the entire field of view while increasing the aperture, it has a positive glued component made in the form of a meniscus with a concavity facing the aperture diaphragm, a second lens of which is made in the form of a positive meniscus, the first positive meniscus is 0.14f about; all the positive objective lenses are made of glass with a refractive index of at least 1.65 and the average disp coefficient rsii not less than 50, and all negative 5 objective lenses - made of glass with a refractive index of at least 1.7 and a coefficient of average dispersion not exceeding 30 where f is the objective focal distance t 5 W 17 18 P J 12, 13 I I i 19