RU135819U1 - LARGE-SCREEN PLANOCHROMATIC HIGH-APERTURE MICRO LENS - Google Patents

Abstract

1. Plano-chromatic high-aperture micro lens of large magnification, containing five components in series, the first of which is made in the form of a meniscus convex to the image space, the second, consisting of two positive lenses, the third, glued from two lenses, the fourth, containing a single positive and glued from a positive and negative lens, and a fifth component, comprising a double-bonded lens from a positive and negative lenses, characterized in that the first component made of glued from a negative meniscus, convex to the image space and an additional positive lens located in front of the meniscus, the positive lenses of the second component are glued, the first of positive and negative menisci, convex into the image space, and the second of a biconvex positive lens and negative meniscus, convex into the image space, the third glued component consists of a negative meniscus, facing concave In the fourth component, a single positive lens is made in the form of a meniscus turned concavity into the image space, and the double-glued lens of the fifth component is made of two menisci turned concavity into the object space , and in front of it is additionally placed a single meniscus facing concavity into the space of the object. 2. High-aperture micro-volume plan

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 known apochromatic microscope objective [1], containing five components, the first of which is a positive meniscus facing concavity into the space of the object, the second is a double-glued positive lens, the third component is a three-glued positive lens, the fourth component contains two glued positive lenses and the fifth is a negative meniscus.

The lens has an apochromatic correction for a point on the axis, a high input aperture, but an insufficient image field (20 mm), residual astigmatism and image curvature, which do not allow simultaneous observation of the entire image field, as well as a 160 mm tube.

The closest technical solution to the claimed utility model is a high aperture achromatic micro lens of large magnification [2]. It contains five components, the first of which is a positive meniscus convex to the image space, the second is made in the form of two positive menisci convex to the image space, the third component is glued from the positive and negative lenses, the fourth contains a positive biconvex lens and gluing from the positive and negative lenses, the fifth - negative meniscus, facing concavity to the space of images, glued from the positive and negative lenses.

The lens has a rather high input aperture (63 × 1.15), but not high enough point correction on the axis and in the field, large chromaticity of magnification (0.8%), residual astigmatism and curvature, and insufficient linear image field (20 mm).

Modern microscope models require a high-aperture plano-chromatic micro-lenses, which have improved correction of monochromatic and chromatic aberrations on the axis and the entire field of the image.

The main task that the proposed useful model is aimed at is to increase the linear field of the image and the input numerical aperture, and to improve the mono and chromatic aberrations of the axial and off-axis beams.

The problem is solved using the proposed planochromatic high-aperture micro lens of large magnification, which, like the prototype, contains five components in series, the first of which is made in the form of a meniscus, convex to the image space, the second, consisting of two positive lenses, the third, glued from two lenses, a fourth containing a single positive and glued from a positive and negative lens, and a fifth component including a double-glued lens, consisting of positive and negative lenses.

Unlike the prototype, the first component is glued from a negative meniscus convex to the image space and an additional positive lens located in front of the meniscus, the positive lenses of the second component are glued, the first of the positive and negative menisci convex into the image space, and the second from a biconvex positive lens and a negative meniscus convex to the image space, the third glued component consists of the negative meniscus turned concavity into the image space and the positive biconvex lens and in front of it is placed a positive biconvex lens, in the fourth component a single positive lens is made in the form of a meniscus turned concavity into the image space, and the double-glued lens of the fifth component is made of two menisci facing concavity in the space of the object, and in front of it is additionally placed a single meniscus facing concavity into the space of the object.

In addition, the refractive indices of the negative meniscus of the first component, the negative menisci of the second component, the negative lens in the gluing of the fourth component and the negative meniscus of gluing the fifth component are 1.78≤n _d ≤1.85, and their dispersion coefficients are 40≤ν _d ≤47, the refractive indices are negative the meniscus in gluing the third component and the positive meniscus in gluing the fifth component have values 1.8≤n _d ≤1.85, and their dispersion coefficients are 22≤ν _d ≤25.

The essence of the proposed utility model is that the implementation of the first and second components is bifurcated, the third - glued from a negative meniscus and a positive biconvex lens and the placement of a positive biconvex lens in front of it, the placement of an additional negative meniscus before gluing in the fifth component, as well as the lens configuration, allowed provide planned correction, and the choice of glasses with the above refractive indices and dispersion coefficients allowed us to achieve apochromatic correction and increase the input numerical aperture from 1.15 to 1.2.

Based on the foregoing, we can conclude that the new set of essential features of the claimed utility model made it possible to obtain a technical result consisting in achieving plan-chromatic correction, due to which the entire field of view with high contrast is simultaneously observed, to increase the linear field of the image by 1.25 times and the input aperture to 1.2 .

The proposed planochromatic high-aperture, high magnification micro lens is illustrated by the drawing, in which in FIG. 1 presents its optical scheme, as well as the Appendix, which gives the design parameters and aberration releases.

The inventive planachromatic high-aperture high-magnification micro lens contains five components.

The first component I contains a negative meniscus 1, convex in the image space, in front of which is additionally placed a positive lens 2, which is glued to the meniscus 1.

The second component II consists of two positive lenses, the first of which is the gluing of the positive 3 and negative 4 menisci convex into the image space, the second is glued from the positive biconvex lens 5 and the negative meniscus 6 convex into the image space.

The third component III contains a negative meniscus 7, turned concavity into the image space, glued with a positive biconvex lens 8, and in front of it is additionally placed a positive biconvex lens 9.

The fourth component IV contains a single positive lens 10 made in the form of a meniscus facing concavity into the image space, and glued from a positive biconvex 11 and negative biconcave lens 12 meniscus facing concavity into the image space.

The fifth component V consists of glued positive 13 and negative 14 menisci facing concavity into the space of the object, in front of which is placed a negative meniscus 15 facing the concavity into the space of the object.

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 the positive lens 2 and the negative meniscus 1, forming an imaginary enlarged image, introducing a positive spherical aberration, chromaticity of position and magnification.

Component II of lens 3, 4, 5, and 6 also constructs an enlarged imaginary image of the object, introducing astigmatism, curvature and a large coma, correcting spherical aberration, chromaticity of position and magnification.

Further, component III of the lens 9, 7 and 8 form a real enlarged image, reducing astigmatism and curvature, spherical aberration, chromaticity of position and magnification, compensating for the coma.

Component IV lenses 10, 11 and 12 build a real image of the object in the focal plane of component V, correcting astigmatism and curvature.

Component V of the lens 15, 13 and 14 transfers the image of the object to infinity, forming a planochromatic high-contrast image of the object.

According to the proposed scheme, micro lenses with an increase of 63 ^x , a numerical aperture of 1.2 water immersion and 1.25 oil immersion, and a linear image field of 25 mm are realized.

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

Table 1 Rel image value Strehl number one 0.61 0.866 0.75 0.707 0.83 0.5 0.88 0 0.94

INFORMATION SOURCES

1. The lens 63 × 1.2 water immersion with. 11 "Appendices to the dissertation" Theory, design methods and calculation of microscope optics ", 1985

2. RU, utility model No. 36535, U1, G02B 21/02, 2003 - prototype

Claims (2)

1. Plano-chromatic high-aperture micro lens of large magnification, containing five components in series, the first of which is made in the form of a meniscus convex to the image space, the second, consisting of two positive lenses, the third, glued from two lenses, the fourth, containing a single positive and glued from a positive and negative lens, and a fifth component, comprising a double-bonded lens from a positive and negative lenses, characterized in that the first component made of glued from a negative meniscus, convex to the image space and an additional positive lens located in front of the meniscus, the positive lenses of the second component are glued, the first of positive and negative menisci, convex into the image space, and the second of a biconvex positive lens and negative meniscus, convex into the image space, the third glued component consists of a negative meniscus, facing concave In the fourth component, a single positive lens is made in the form of a meniscus turned concavity into the image space, and the double-glued lens of the fifth component is made of two meniscuses turned concavity into the space of the object , and in front of it is additionally placed a single meniscus facing concavity into the space of the object. 2. The plano-chromatic high-aperture micro lens of large magnification according to claim 1, characterized in that the refractive indices of the negative meniscus of the first component, negative menisci of the second component, the negative lens in the gluing of the fourth component and the negative meniscus of gluing the fifth component are 1.78 ≤ n _d ≤1 85, and their dispersion coefficients 40≤v _d ≤47, the refractive indices of the negative meniscus in gluing the third component and a positive meniscus gluing fifth component are as 1,8≤n _d ≤1,85, and their oeffitsienty dispersion 22≤v _d ≤25.

Images