SU1242892A1 - High-speed wide-angle lens - Google Patents

Abstract

The invention relates to the field of optical instrument making and allows improving image quality as well as reducing the transverse dimension of the lens and its mass. The wide-angle lens contains eleven lenses (l), the first, third and fifth of which are negative menisci that are convex to the object. The second L is made in the form of a positive meniscus with a concavity facing the object, and a fourth in the form of a positive meniscus convex to the object. Sixth L is negative, the seventh is double-convex. Eight A is a negative meniscus with a concavity facing the object. The devil L is made in the form of a negative meniscus glued together from a double-folded layer and a double-concave L, the tenth one in the form of a positive meniscus, facing its concavity towards the object. Eleventh L is glued together from a negative meniscus and a two-convex L. The optical powers of the second and eighth L are respectively 0.11 and -0.06 of the optical power of the objective. 2 Il. c (O (L 1C N3 00 QD tc

Description

The invention relates to optical instrumentation, in particular to lenses for shooting and projection 16. and 35mm movies.

The purpose of the invention is to improve the image quality, reducing the lateral dimension and weight.

Fig. 1 shows the optical scheme of a wide-angle light lens in Fig. 2 — a graph of the frequency-contrast characteristic for the mid-field of view (6 mm) and a curve of the threshold contrast of the KN-1 and KN-2 films.

The lens consists of a negative meniscus 1, a positive meniscus. 2 and negative meniscus 3, which form the frontal component 4, positive .5 and two negative 6 and 7 menisci, two convex lenses 8, negative meniscus 9 negative lenses, glued together with a double-curved lens 11, positive meniscus 12 : and a positive lens glued from a negative 13 menu and a dual lens 14.

According to the proposed scheme, a wide-aperture aperture lens was developed, having the following characteristics: focal length F 18 MMJ relative aperture 1: 1.4} field of view 2W rear focal length Sj., 33.2 mm.

The lens has a high image quality (for example, the curvature is x -0.22 mm, the sagittal curvature is Xg -0.11 mm) with a small envelope (light diameter (about 49.5 m optical length L 89.1 mm) and

no aspherical surfaces. The resolution of the lens when working with KI-1 films in the center of the frame (0) is 55 lines / mm, in the frame area (6 mm) 42 lines / mm, on the edge of the frame (12.5 mm) 37 lines / mm

Formula of invention

A high-aperture wide-angle lens containing eleven lenses, the first, third and fifth of which are negative menisci facing the subject, the second and fourth are positive, the meniscus convex to the subject, the seventh is two caps, the eighth is negative, nine - meniscus, tenth - positive meniscus, facing concavity to the object, and eleven - positive two-fold, characterized in that, in order to improve image quality, reduce the lateral dimension and mass, the second lens Made in the form of a positive meniscus with a concavity towards the object, a fourth in the form of a positive meniscus, with a focus towards the object, the pole is made negative, eight in the form of a meniscus, with a concavity towards the object, nine are made negative, glued together in two. the eleven co-bent lenses are glued together from a negative meniscus and a two-convex lens, while the optical powers of the second and eighth lenses are respectively 0.1 1 and -0.06 of the optical power of the lens,

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FIG.

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in 16 Zft Sg Sch 8 56 6 72

Hf

ft Зг Щ 8 56 6 72

, t

Editor N. Bobkova

Compiled by V. Arkhipov

Tehred O. Sopko Proofreader S. Cherni

Order 3701/45 Draw 501 Subscription

-VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

g

FIG. 2

Claims (1)

Claim Fast wide-angle lens containing eleven lenses, the first, third and fifth of which are negative menisci convex to the subject, the second and fourth are positive, the sixth is the meniscus convex to the subject, the seventh is biconvex, the eighth negative, the ninth is the meniscus , the tenth is a positive meniscus facing concavity to the object, And a single lens glued from a biconvex lens 10 and a biconcave lens 11, a positive meniscus 12: and a positive lens glued from a negative 25 eniska 13 and biconvex lens 14. According to the proposed scheme, a wide-angle fast lens was developed, which has the following characteristics: focal length F * = 18 mm; relative aperture 1: 1.4; field of view angle 2W = -75 °; posterior focal segment S _fl = 33.2 mm The lens has high image quality (for example, meridional curvature х _т = -0.22 mm, sagittal curvature χθ = -0.11 mm) with a small size (light diameter = 49.5 mm, optical length L = 89.1 mm ) and r · —..... t the eleventh is positive biconvex, which means that, in order to improve image quality, reduce the transverse dimension and mass, the second lens is made in the form of a positive meniscus facing concavity to the object, the fourth - in the form of a positive meniscus convex to the subject, the sixth on the negative, the eighth - in the form of a meniscus facing concavity to the object, the ninth is made negative, glued from a biconvex and biconcave lenses, the eleventh is made glued from a negative meniscus and a biconvex lens, while the optical powers of the second eighth lens are 0.1 1 and -0.06 optical power of the lens. FIG. 2 Editor N. Bobkova Compiled by V. Arkhipov Tehred O. Sopko Corrector S. Cherni Order 3701/45 Circulation 501 Subscription -VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and printing company, Uzhhorod, st. Project, 4