RU145925U1 - HIGH-INCREASED PLANAPROCHROMATIC HIGH-APERTURE IMMERSION MICRO-LENS - Google Patents

Abstract

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 positive biconvex and negative lenses, and the third component containing two bonded 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.

Description

The proposed utility model 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 method, dark field, 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 image space, and a positive biconvex lens, the third from the negative meniscus and the negative biconcave lens, between which there is a positive biconvex lens 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 utility model is a high-aperture planochromatic microscope objective [2] containing three components sequentially located along the rays, the first of which includes a positive bonded lens and a meniscus glued from the positive and negative menisci, turned concave into the space of the object, the second 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 atelnoy and a biconvex positive lens of the third biconvex positive and negative lenses, and the third component comprises two cemented negative meniscus facing concavity in image space, the first of which is glued from the positive and negative menisci, the second - from the positive biconvex lens and a biconcave negative.

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 to which the proposed utility model is directed is to increase the linear field of the image, improve aberrations along the image field, and eliminate the chromaticity of the increase.

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 proposed utility model 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 execution of the negative lens in the form of a meniscus, turned concavity in the space of the object in the third glued positive lens in the second component, as well as the execution of the second glued meniscus from two menisci, turned concavity into space The property of the object in the third component made it possible to increase the linear field of the image from 20 mm to 25 mm, improve the planned correction, and correct the chromaticity of the increase.

Based on the foregoing, it can be concluded that a new set of essential features of the claimed utility model made it possible to obtain a technical result consisting 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 by the drawing, in which Fig. 1 shows its optical scheme, as well as by the Appendix, which gives the design parameters and aberration releases.

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 concave into the image space, glued from the positive 9 and negative 10 menisci and a negative meniscus turned concavity into the object space, glued from the positive 11 and negative 12 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 realized.

Table 1 presents the Strehl number, which characterizes the image quality for the given

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 Suggestion 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

application

Focal Length, mm: 1.6 Numerical aperture in the space of objects: 1.25 Image Diameter, mm: 25.0 Paraxial linear increase, krat: -125.0

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.