SU1670663A1 - Wide-angle lens - Google Patents

Abstract

This invention relates to optical instrumentation, namely to wide-angle photographic lenses. The purpose of the invention is to improve the image quality with a simultaneous increase in the back focal length with small dimensions. A wide-angle lens consists of the first 1 and second 2 components, separated by an aperture diaphragm 3, the first of which contains the first, second and third negative menisci 4, 5, 6, facing the concavity of the image space, two convex lens 7 and two glued two convex lens 8, consisting of a double convex lens 9 and a negative meniscus 10. The second component 2 consists of a double convex lens 11 glued together from a positive meniscus 12, a double convex lens 13 and two two convex lenses 14 and 15. The focal length of the lens F ¹ = 92 m m, angular field 2ω = 66 °, rear focal length S _F = 13.6 mm, resolution 100 min / mm with a contrast of 0.25.

Description

one

(21) 4726922/10

(22) 07.08.89

(46) 08/15/91. Bul.MgZO

(71) Leningrad Institute of Fine Mechanics and Optics

(72) A.V. Brucevitsky, A.V. Ivanov, L.N. Kurchinsk, L.I. Przhevalinsky and V.V. Usoskin (53) 771.351.3 (088.8)

(56) USSR Copyright Certificate No. 1210114, cl. G 02 B 9/62, 1986.

USSR author's certificate number 1224768, cl. G 02 B 9/64, 1984. (54) WIDE-ANGLE LENS

(57) The invention relates to optical instrumentation, namely to wide-angle photographic lenses. The purpose of the invention is to improve the image quality with a simultaneous increase in the back focal length with small dimensions. The wide-angle objective consists of the first 1 and second 2 components, separated by an aperture diaphragm 3, the first of which contains the first, second and third negative menisci 4,5,6, facing the concavity of the image space, two convex lens 7 and two glued two convex lens 8, consisting of a two-convex lens 9 and a negative meniscus 10. The second component 2 consists of a two-convex lens. glued from a positive meniscus 12, a double-bent lens 13 and two two-convex lenses 14 and 15. The focal length of the lens f1 is 92 mm, the angular field is 2 pcs 66 °, the back focal length SF is 13.6 mm, the resolution is 100 min / mm at Contrast 0.25. / Il.

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About vj

O o o o w

This invention relates to optical instrumentation, namely to wide-angle photographic lenses.

The aim of the invention is to improve the image quality with a simultaneous increase in the back focal length with small dimensions.

The drawing shows the optical scheme of a wide-angle lens consisting of two components 1 and 2, separated by an aperture diaphragm 3. The first component 1 includes three negative meniscus 4-6, a two-convex lens 7 and a glued two-convex lens 8 consisting of a two-convex lens 9 and a negative meniscus 10. The second component 2 consists of a double-concave lens 11, glued together from a positive meniscus 12, and a double-concave lens 13 and two two-convex lenses 14 and 15.

This lens is photographic and the object for it is at infinity, so a parallel beam of rays is incident on the lens. The rays pass through the first component 1 of the lens (Fig. 1), located in front of the aperture stop, completely fill the aperture aperture 3. Then the rays pass successively the following lenses 11, 14 and 15 (Fig. 1) and in the focal plane the lens located at a distance of 13.6 mm F, form the image of the lens. As a concrete example, a wide-angle lens is designed with the following characteristics: focal length f - 9.2 mm; angular field 2 W 66 °; rear focal segment SF 13.6 mm; resolution 100 lines / mm with a contrast of 0.25.

In the first component 1, the introduced third negative meniscus 6 allows one to correct the spherical aberration and the coma of the wide oblique beam. Positive lenses 7, 8 of the first component increase the relative aperture of the lens. Gluing in the second double convex lens 8 is introduced to correct chromatic aberrations, more specifically, to correct the chromaticism of the situation.

The double-concave glued lens 11 of the second component 2 serves to correct the chromatism of magnification, curvature of the image and astigmatism. Two positive lenses 14, 15 at the end of the lens serve to correct spherical aberration for a point on the axis and increase the relative aperture.

In the above version of the calculation, spherical aberration (AS1) in the entire spectral range does not exceed 0.15 mm. For the main wavelength - 0.102 mm. and transverse spherical aberration is 0.04 mm. The chromatism of the position does not exceed 0, 14 mm, the chromatism of the increase is 0.01 mm. Image curvature is: g /; 33 °; Zt -0.072; Zs 0.010; w 24 ° 41; Zt - 0.068; Zs 0.013.

Lens resolution in

center 100 lin / mm with a contrast of 0.25.

Claims (1)

Claims of Invention A wide-angle lens containing two components separated by an aperture stop, the first of which consists of the first and second negative meniscuses facing the image space, and the first and second positive lenses, and the second component of a double-coiled lens, a positive lens, and a double-convex lens, characterized in that, in order to improve the image quality while simultaneously increasing the rear focal length with small dimensions, in the first component, a negative meniscus is introduced, convex facing the space of objects and installed between the second negative meniscus and the first positive a lens, the first positive lens of the first component is made two-convex, the second positive lens of the first component is made of a two-glued two-convex lens and a negative meniscus, The component is designed as a twin convex lens.