SU924652A1 - Reproduction lens - Google Patents

Description

The invention relates to instrumentation, in particular to optics, more specifically to high-resolution lens reproduction lenses. The lens can be used in copiers reader-an- Paratov ^5, in the chambers of photographic reproductions, for microfilming.

A known lens containing with '0 two negative meniscus-shaped lenses separated by an aperture diaphragm and enclosed between two positive C-11 lenses.

However, this lens has a low resolution in a wide angle of field of view.

A reproductive lens is known, containing two negative meniscus _χ- shaped lenses facing concavities to each other, separated by a diaphragm and enclosed between two positive C21 lenses.

However, the known lens does not allow to increase the resolution.

The purpose of the invention is the improvement of image quality within the entire field of view in a wide region of the spectrum.

This goal is achieved by the fact that in a lens containing two negative meniscus-like lenses facing concavities one to another separated by a diaphragm and enclosed between two positive lenses, the first positive lens is glued from a negative meniscus and a biconvex lens, and a negative meniscus is installed behind the lens, facing concavity to the diaphragm.

The drawing shows an optical diagram of the proposed lens.

The lens consists of five components 1-5 and an aperture diaphragm 6 located between components 2 and 3. Component 1 is made in the form of '

a positive double-glued lens, consisting of a negative meniscus 7 and a biconvex lens 8. Component 2 is a single negative meniscus facing a diaphragm with a concavity. Component 3 ~ negative double-glued meniscus, facing concavity to the diaphragm and consisting of negative 9 and positive 10 menisci. Component 4 is a biconvex lens. Component 5 ”is a negative meniscus with a concavity facing the diaphragm.

The proposed construction of the optical system allows you to create a lens with a focal length of 34 mm, a relative aperture of 1: 2.8 and an angle of view of 30 °.

The lens forms a high-quality image of an object located at a finite distance with an increase of $> = -0.033 * in the plane of the light emission receiver 11.

Image quality for a point on the axis is characterized by a scattering circle cL = 0.006 mm, for extreme points of the field of view << = 0.008 mm.

The distortion of the lens throughout the field of view does not exceed 0.4%.

Monochromatic aberration corrected for the line λ- = 589.3 nm (D),

924652 4 'achromatization performed for the line | .L = 486.1 nm (F) and L = 656.3 nm (C).

The lens allows you to increase resolution to 110 min / mm with a contrast of at least 0.1 across the entire field of view.

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Claims (2)

The invention relates to instrumentation, in particular, to optics, and more specifically to lens reproduction objectives of high resolution. The lens can be used in reading and copying machines, in cameras of photographic reproduction, for microfilming. A lens containing two negative meniscal lenses, separated by an aperture diaphragm and enclosed between two positive lenses p. However, this lens has an insufficiently high resolution in a wide angle of view. A reproduction object is known that contains two negative meniscus shaped lenses facing one another in concavity, separated by a diaphragm and enclosed between two positive lenses C21. However, the known lens does not allow to increase the resolution. The purpose of the invention is to improve image quality over the entire field of view in a wide spectral region. This goal is achieved by the fact that in a lens containing two negative meniscus-shaped lenses facing one another to the other separated by a diaphragm and enclosed between two positive lenses, the first positive lens is glued together from a negative meniscus and a two-convex lens, and a negative meniscus facing a concave is mounted to the diaphragm. The drawing shows the optical layout of the proposed lens. The lens consists of five components 1-5 and an aperture diaphragm 6 located between components 2 and 3. Component 1 is made in the form of 3 positive two-glued lenses consisting of a negative meniscus 7 and a two-convex lens 8. Component 2 is a single negative meniscus, facing the concavity of the diaphragm. Component 3 is a negative two-glued meniscus, facing a concavity toward the diaphragm and consisting of negative 9 and positive 10 meniscuses. Component k is a two-fold lens. Component 5 is a negative meniscus with a concavity facing the diaphragm. The proposed construction of the optical system makes it possible to create a lens with a focal length of 3 mm behind, a relative aperture of 1: 2.8, and a 30 ° angle of view. The lens forms a high-quality image of the object, the distance from the tip at -0.033 to the plane by increasing the receiver 11 of the light radiation. The image quality for a point on the axis is characterized by a scattering circle oL 0.006 mm, for the extreme points of the field of view, with 0.008 mm. The lens distortion across the entire field of view does not exceed Q, k%. Monochromatic aberrations are corrected for the A-589 3 nm line (D 2 achromatization is performed for the A line. A 86.1 nm (F) and L 656.3 nm (C). The lens allows the resolution to be increased to 110 min / mm with the contrast not less than 0.1 across the entire field of view. Formula of the Invention A reproduction lens containing two negative meniscus-like lenses facing one another, separated by a diaphragm and enclosed between two positive lenses, characterized in that, in order to improve the image quality throughout the entire sex sight in shi The first positive lens is glued from a negative meniscus and a two-convex lens, and a negative meniscus facing the concavity of the diaphragm is installed behind the lens. Sources of information taken into account in the examination 1. US Patent No. 154509, C. 350-220, published in 1980. 2. US Patent No. 2799207, chl. 350-209, published. 1957 (prototype).