RU2551989C1 - High-magnification plan-apochromatic high-aperture immersion microlens - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: microlens comprises three components. The first component comprises a positive double-glued lens and a positive meniscus in the form of a single lens, which faces the object space with the concave surface. The second component consists of three positive lenses, the first of which is a single biconvex lens, the second is glued from a negative and a biconvex lens, the third is glued from a biconvex lens and a negative meniscus which faces the object space with the concave surface. The third component comprises two glued negative menisci, the first of which includes a positive meniscus and a negative meniscus, which face the image space with the concave surface, and the second is made of a positive meniscus and a negative meniscus, which face the object space with the concave surface.

EFFECT: larger linear image field, improved aberrations on the image field and eliminating chromatism of magnification.

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Description

The present invention relates to optical instrumentation, namely, microscope lenses, and can be used for visual observation and photographing of low-contrast microscopic structures that are at the limit of the resolution of light microscopes in natural light, visible luminescence light, in polarized light by the bright field, dark field method , phase contrast, etc.

A well-known high-aperture planochromatic microscope objective [1] containing three components sequentially located along the rays, the first of which includes a positive glued lens, a positive meniscus facing concavity into the space of the object, and a meniscus glued from a negative biconcave and positive biconvex lens, the second component consists of three glued lenses, the first of which is glued from a negative and positive biconvex lenses, the second from a negative meniscus facing bent into the space of the image, and the positive biconvex lens, the third from the negative meniscus and the negative biconcave lens, between which the positive biconvex lens is located, and the third component contains two glued negative menisci, the first of which is turned concave into the image space and glued from the biconvex positive and biconcave negative lenses, the second glued negative meniscus is turned concavity into the space of the object and glued from the negative in two ways concave and positive biconvex lenses.

The lens has achromatic correction, a high input aperture, but an insufficient image field (20 mm), insufficiently corrected aberrations of off-axis beams.

The closest technical solution to the claimed invention is a high-aperture planochromatic microscope objective [2], containing three components sequentially located along the rays, the first of which includes a positive glued lens and a meniscus glued from the positive and negative menisci facing concavity into the space of the object, the second the component consists of three positive double-glued lenses, the first of which is glued from a positive lens and a negative meniscus, the second from negative integral and positive biconvex lenses, the third of the positive biconvex and negative lenses, and the third component contains two glued negative menisci turned concavity into the image space, the first of which is glued from the positive and negative menisci, the second from the positive biconvex and negative biconcave lenses.

The lens has a planapochromatic correction, a high input aperture, but an insufficient image field (20 mm), insufficiently corrected aberrations of off-axis beams and residual chromatism of an increase in CRI = 0.8%.

The main task, the solution of which the invention is directed, is to increase the linear field of the image, improve aberrations along the image field and eliminate chromaticity of magnification.

The problem is solved using the proposed planochromatic high-aperture immersion micro-lens of large magnification, which, like the prototype, contains three components in series, the first of which is made in the form of a positive double-glued lens and a positive meniscus facing concavity into the space of the object, the second, consisting of three positive lenses, the second of which is glued from the negative and positive biconvex lenses, the third is glued from the positive and biconvex and second negative lens, and a third component comprising two cemented negative meniscus, the first of which includes a positive and a negative meniscus facing concavity in image space.

Unlike the prototype, in the first component, the positive meniscus, turned concavity into the space of the object, is made in the form of a single lens, the first positive lens of the second component is made in the form of a single biconvex lens, in the third glued positive lens, the negative lens is made in the form of a meniscus, turned concavity into space object, and in the third component, the second negative meniscus is made of positive and negative menisci facing concavity into the space of the object.

The essence of the invention lies in the fact that the execution of the positive meniscus, turned concavity into the space of the object, in the first component in the form of a single lens, the execution of the first positive lens of the second component in the form of a single biconvex lens, and the implementation of the negative lens in the form of a meniscus, turned concavity into space object in the third glued positive lens in the second component, as well as the execution of the second glued meniscus from two menisci facing concavity into space GUT object in the third component, it possible to increase the linear image field from 20 mm to 25 mm, to improve correction routine and correct chromatism increase.

Based on the foregoing, we can conclude that a new set of essential features of the claimed invention allowed us to obtain a technical result, which consists in increasing the linear field of the image, eliminating the chromaticity of the increase, as well as improving the correction of off-axis beams.

The proposed planochromatic high-aperture immersion micro-lens of large magnification is illustrated in the drawing, in which Fig. 1 shows its optical scheme.

The inventive planochromatic high aperture immersion micro-lens of large magnification contains three components.

The first component I contains a positive bonding of lenses 1 and 2, a positive meniscus 3, facing concavity into the space of the object.

The second component II consists of three positive lenses, the first of which is a biconvex lens 4, the second is a gluing of the negative biconcave 5 and the positive biconvex 6 lenses, the third is glued from the positive biconvex lens 7 and the negative meniscus 8.

The third component III contains a negative meniscus turned concavity into the image space, glued from the positive 9 and negative 10 menisci, and a negative meniscus turned concavity into the space of the object, glued from the positive 11 and 12 negative menisci.

The proposed lens works as follows.

The lens works with a tube lens f '= 200 mm.

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 the positive meniscus 3, form an imaginary enlarged image, introducing negative spherical aberration, chromaticity of position and magnification.

Component II of the lens 4, 5, 6, 7, and 8 constructs an enlarged real image of the object in the focal plane of component III, reducing the aperture of the outgoing beam, reducing spherical aberration, position chromatism, and coma. Component III of the lens 9, 10, 11 and 12 transfers the image of the object to infinity, forming a planochromatic high-contrast image of the object.

According to the proposed scheme, an immersion micro lens with a magnification of 125 ^x , a numerical aperture of 1.25 oil immersion, and a linear image field of 25 mm is implemented.

Table 1 presents the Strehl number, which characterizes the image quality for the relative values of the image values for the oil immersion lens of the prototype and the proposed micro-lens.

Table 1 The relative value of the image size Strehl number Prototype Proposed one 0.12 0.47 0.866 0.16 0.61 0.707 0.26 0.74 0.5 0.61 0.81 0 0.9 0.84

INFORMATION SOURCES

1. International application WO No. 2009/057666, IPC: G02B 21/02, 2009

2. Russian Federation, utility model patent No. 28779, IPC: G02B 21/02, 2003 - prototype.

Claims (1)

Plano-chromatic high-aperture immersion micro-lens of large magnification, containing three components in series, the first of which is made in the form of a positive two-glued lens and the positive meniscus facing concavity into the space of the object, the second, consisting of three positive lenses, the second of which is glued from a negative and positive biconvex lens the third component is glued from a positive biconvex and negative lenses, and the third component containing two glued negatives meniscus, the first of which includes positive and negative menisci turned concave into the image space, characterized in that in the first component the positive meniscus turned concavity into the object space is made in the form of a single lens, the first positive lens of the second component is made in the form single biconvex lens, in the third bonded positive lens, the negative lens is made in the form of a meniscus, turned concavity into the space of the object, and in the third component th negative meniscus is formed from the positive and negative meniscus facing concavity in the object space.