RU190392U1 - PLANOPOCHROMATIC HIGH-APERTURAL IMMERSION MICROOM LEGAL MEDIUM ENLARGEMENT - Google Patents

Abstract

The micro-lens can be used for visual observation and photographing low-contrast microscopic structures that are at the limit of the resolution of light microscopes. The micro lens has three components. The first component consists of a positive dual lens, including a flat-convex lens and a meniscus facing concavity into the space of the object, a single positive meniscus facing concavity into the space of the object, and additionally introduced a single positive meniscus facing the concavity into the space of the object. The second is of two positive glueings. The first gluing is made of a negative meniscus reversed in the image space, and a biconvex lens, and the second gluing contains two biconvex lenses and a biconcave lens between them. The third one contains two glued negative menisciks, the first of which is made in the form of positive and negative meniscuses and facing concavity in the image space, and the second from negative and positive meniscuses and facing concavity into the object space. The technical result is an increase in the output aperture while maintaining planapochromatic correction and a linear field of view. 1 hp f-ly, 4 ill., 1 tab.

Description

The proposed utility model relates to optical instrument making, namely to microscope lenses, and can be used for visual observation and photographing low-contrast microscopic structures that are at the limit of the resolution of light microscopes in natural light, light of visible luminescence, in polarized light using the bright field method, dark fields, phase contrast, etc.

The planpochromatic high-aperture microobjective [1] is known, containing five components successively located, the first of which is made of a positive lens and meniscus convex to the image space, the second, consisting of two positive lenses, is first glued together from a positive and negative meniscus facing a convexity into space images, and the second of a biconvex positive lens and a negative meniscus convex into the image space, the third contains positive biconvex lens and gluing together of negative and positive biconvex lenses; the fourth one is made of positive meniscus and meniscus glued of positive biconvex and negative biconcave lenses that are turned into concavity into the image space; .

The lens has a planapochromatic correction, a large linear field of view (25 mm), but the output aperture is not large enough (0.02).

The closest technical solution is the plan-apochromatic high-aperture immersion microobjective of the microscope [2], containing three components sequentially arranged along the rays, the first of which includes a positive dual-lens, containing a positive lens and a meniscus facing concavity into the object space, and a positive dual-glued meniscus facing concavity in the space of the object, made of positive and negative menisci, the second component, consisting of three, put The first glued lenses, the first of which is made of a biconvex positive lens and a negative meniscus facing concavity into the space of an object, the second one of a positive biconvex and negative biconcave lenses, and a third one glued from a negative meniscus facing concavity into the image space and a negative lens, between which there is a positive biconvex lens, and the third component contains two glued negative meniscus, the first of which is glued together from the positive two a convex and negative biconcave lenses, facing in with the concavity into the image space, and the second, facing with the concavity into the space of the object - from positive and negative menisci.

The lens has a plan-apochromatic correction, a high input aperture and a 25 mm image field.

The disadvantage of the known lens is that its output aperture is small (0.013),

The main task, which the intended utility model is aimed at, is to increase the output aperture while maintaining the plan-apochromatic correction and the linear visual field.

The problem is solved using the proposed plan-anchromic high-aperture immersion micro-lens of medium magnification, which, like the prototype, contains successively arranged three components, the first of which consists of a positive duplex lens, including a flat-convex lens and a meniscus reversed in the object space, and a positive meniscus, facing the concavity into the space of the object, the second consisting of two positive gluing, and the third containing two glued focal meniscus, the first of which is turned by concavity into the image space, and the second is turned by concavity into the space of object.

Unlike the prototype, in the first component, a positive meniscus reversed in the object space is single and an additional single positive meniscus reversed in the object space is placed behind it, the first positive gluing of the second component being made of a negative meniscus reversed in the space images, and a biconvex positive lens, and the second positive splicing contains two positive biconvex lenses and a negative biconcave lens, in addition, in the third component, the first glued negative meniscus is made in the form of positive and negative meniscuses, and the second glued negative meniscus is made of negative and positive menisci.

In addition, the refractive indices of the meniscus reversed in the object space in the glued lens and the first positive meniscus of the first component, the negative meniscus in the first glued meniscus and the positive meniscus in the second glued meniscus of the third component have values 1.8≤n _d ≤ 1.85, and their coefficients dispersion 25≤ν _d ≤32, the refractive index of an additional single positive meniscus in the first component is 1.75≤n _d ≤1.79, and its dispersion coefficient is 44≤ν _d ≤48.

The essence of the proposed utility model is that in the first component there are two single meniscuses instead of gluing, a first gluing of the second component from the meniscus and a biconvex lens, a second gluing of the second component from two biconvex lenses and a biconcave lens placed between them, in the third component of the first glued meniscus of the two menisci, allowed for a planned correction, and the choice of glasses with the above refractive indices and dispersion coefficients allowed us to achieve apochromat eskoy correction output and increase the numerical aperture from 0.0125 to 0.032.

Based on the above, we can conclude that the new set of essential features of the claimed utility model allowed us to obtain a technical result consisting in increasing the output aperture by 2.5 times while maintaining a plan-apochromatic correction and a field of view of 25 mm, due to which the entire field of view is observed simultaneously.

The proposed plan-apochromatic high-aperture immersion micro-lens of medium magnification is illustrated by drawings, where in FIG. 1 shows the optical scheme of a plan-apochromic high-aperture immersion micro-lens of medium magnification; in fig. 2 is a graph of wave aberrations; in fig. 3 is a plot of main-beam aberrations; in fig. 4 is a graph of the frequency-contrast characteristic.

The claimed plan-achromatic high-aperture immersion micro-lens of medium magnification contains three components.

The first component I contains positive gluing of the lenses 1 and 2, positive menisci 3 and 4, which are turned into an object space by concavity.

The second component II consists of two positive lenses, the first of which is the gluing of the negative meniscus 5 and the biconvex positive lens 6, the second is the three-glued of two positive biconvex lenses 7 and 9 with a negative biconcave lens 8 in between.

The third component III contains a negative meniscus reversed in concavity into image space, glued from a positive meniscus 10 and a negative meniscus 11 and a negative meniscus reversed in concavity into an object space, glued from a negative 12 and positive 13 meniscuses.

The proposed lens works as follows.

The lens works with a tube lens f '= 160 mm.

The rays from the object of observation, located in the front focal plane of the micro-lens, pass through the first component I - glued lenses 1 and 2 and positive menisci 3 and 4, forming a perceived magnified image, introducing negative spherical aberration, chromatism of position and magnification, to whom.

Component II of lenses 5, 6, 7, 8 and 9 builds an enlarged real image of the object in the focal plane of component III, reducing the aperture of the outgoing beam, rectifying to whom.

Component III lenses 10, 11, 12 and 13 transfer the image of the object to infinity, forming a plano-chromatic contrast image of the object.

According to the proposed scheme, an immersion micro-lens was implemented with a magnification of 40 ^× , a numerical aperture of 1.3 oil immersion, a linear image field of 25 mm with the following characteristics:

Focal length, mm: 4.07 Numerical aperture in the space of objects: 1.30 Diameter of the image, mm: 25.0 Paraxial image height, mm: 12.5 Paraxial linear magnification: -40.0

Spectral characteristics of the lens

Table 1 presents the Strehl number characterizing the image quality for the relative values of the image values for the oil immersion lens of FIG. 2, 3 and 4.

Thus, an increase in the output aperture is achieved while maintaining the plan-apochromatic correction and the linear field of view.

INFORMATION SOURCES

1. Russian Federation, patent for invention No. 2532959, IPC: G02B 21/02, G02B 9/64, 2014

2. Russian Federation, patent for invention No. 2549340, IPC: G02B 21/02, G02B 9/64, 2015 - prototype.

Claims (2)

1. Planapochromatic high-aperture medium-magnification immersion micro-lens containing three successively arranged components, the first of which consisting of a positive dual-lens, including a flat-convex lens and a meniscus facing concavity into the space of the object, and a positive meniscus facing concavity into the space of the object, the second consisting of two positive gluing, and the third, containing two glued negative meniscus, the first of which is turned into a concavity into the space of image, and the second one is facing concavity into the object space, characterized in that in the first component the positive meniscus reversed in the object space is single and there is an additional single positive meniscus positioned in the object space with the first positive gluing of the second the component is made of a negative meniscus reversed in the image space, and a biconvex positive lens, and the second positive splicing contains two positive biconvex lenses and a negative biconcave lens placed between them, in addition, in the third component, the first glued negative meniscus is made in the form of positive and negative meniscuses, and the second glued negative meniscus is made of negative and positive menisci. 2. Planapochromatic high-aperture immersion micro-lens of average magnification according to claim 1, characterized in that the refractive indices of the meniscus reversed in the object space in the glued lens and the first positive meniscus of the first component, the negative meniscus in the first glued meniscus and the positive meniscus in the second glued meniscus the third component are as 1.8≤n _d ≤1.85, and their dispersion coefficients 25≤ν _d ≤32, the refractive index of the additional single positive meniscus in the first m has a value component 1.75≤n _d ≤1.79, and its dispersion coefficient 44≤ν _d ≤48.

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