RU136596U1 - LARGE-SCREEN PLANOCHROMATIC MICRO-OBJECT - Google Patents

Abstract

1. Plano-chromatic micro-lens of large magnification, containing five components in series, the first of which is made in the form of a positive meniscus convex to the image space, the second component is made in the form of a positive double-glued lens, consisting of a negative and positive biconvex lenses, the third positive component, consisting of three lenses, the fourth component is made in the form of a positive double-glued lens, consisting of a positive biconvex lens and a negative meniscus, convex to the image space, and the fifth component, made in the form of a negative two-glued meniscus, characterized in that the negative lens of the second component is made in the form of a negative meniscus, convex into the space of the object, the third positive component is made in the form of a single positive biconvex lens and glued from the negative biconcave and positive biconvex lenses, and the negative two-glued meniscus of the fifth component is generally concavity into the space of the object and is made in the form of a biconcave negative and biconvex positive lens. 2. The large-scale plano-chromatic micro lens according to claim 1, characterized in that the refractive index of the positive meniscus of the first component is 1.8 n n ≤ 1.85 and its dispersion coefficient is 42 ν ≤ 47.

Description

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

A planochromatic microscope objective is known [1], which contains seven components, the first of which is the frontal meniscus facing concavity into the space of the object, the second, third, fourth double-glued from the negative meniscus and the biconvex lens, the fifth is glued from the positive and negative lenses, the sixth component is glued from the negative and positive lenses, the seventh is made in the form of a negative meniscus, convex in the space of the object.

The lens has a planochromatic correction, but the input aperture is not high enough, the image field does not exceed 20 mm, has an insufficiently corrected point on the axis (Strehl number does not exceed 0.8 in the center), under-corrected astigmatism and image curvature (Strehl number at the edge of the field no more than 0.41), as well as a chromatism increase of 0.6%.

The closest technical solution to the claimed technical solution is a planochromatic lens of a large magnification microscope [2]. The lens contains five components, the first of which is a positive meniscus convex into the image space, the second component is made as a meniscus convex into the image space, glued from a negative biconcave and positive biconvex lenses, the third component is a positive three-glued lens from two positive biconvex lenses between which a negative biconcave lens is placed, the fourth is a positive biconvex lens from a positive biconvex lens incase and negative meniscus, convex to the space of the image, the fifth - negative two-glued meniscus, convex to the space of the object, glued from a positive biconvex and negative biconcave lenses.

The lens has a high input aperture (63 × 0.9) and planochromatic correction, fixed chromaticity magnification.

But the lens does not have enough working distance, making it difficult to manipulate the object under study.

The main task to which the proposed utility model is directed is to increase the working distance while maintaining the plan-chromatic correction.

The problem is solved using the proposed planochromatic 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 positive meniscus convex to the image space, the second component is made in the form of a positive two-glued lens, consisting of a negative and a positive biconvex lens, the third positive component, consisting of three lenses, the fourth component is made as noy dvuskleennoy lens consisting of a biconvex positive lens and a negative meniscus facing convexity in the image space, and a fifth component configured as a negative meniscus dvuskleenogo.

Unlike the prototype, the negative lens of the second component is made in the form of a negative meniscus convex into the space of the object, the third positive component is made in the form of a single positive biconvex lens and glued from the negative biconcave and positive biconvex lenses, and the negative two-glued meniscus of the fifth component is turned concave into space object and is made in the form of a biconcave negative and biconvex positive lenses.

In addition, the refractive index of the positive meniscus of the first component is 1.8≤n _d ≤1.85, and its dispersion coefficient is 42≤ν _d ≤47.

The essence of the proposed utility model consists in the fact that the second component is double-walled from the negative meniscus, convex into the space of the object and a biconvex positive lens, the third is from a single biconvex lens and glued from a negative biconcave and positive biconvex lens, and the fifth is a negative biconcluded meniscus, into the space of an object containing a biconcave negative and biconvex positive lenses, as well as the implementation of the floor The vital meniscus of the first component with the above refractive index and dispersion coefficient allowed us to obtain a technical result consisting in increasing the working distance while maintaining the planned correction with corrected chromaticity of magnification, while it has a significant linear image field (2y '= 25 mm).

Based on the foregoing, we can conclude that the new set of essential features of the utility model allowed us to obtain a technical result consisting in increasing the working distance by 1.3 times, due to which it is possible to manipulate the object under study.

The proposed planochromatic micro lens of high magnification 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 planochromatic high magnification micro lens contains five components.

The first component I contains a positive meniscus 1, convex in the image space.

The second component II is glued from a negative meniscus 2, convex in the space of the object, and a biconvex positive lens 3.

The third component III contains a positive single biconvex lens 4 and glued from a negative biconcave 5 and positive biconvex 6 lenses.

The fourth component IV is glued from a positive biconvex lens 7 and a negative meniscus 8, convex to the image space.

The fifth component V is made in the form of a negative meniscus facing concavity into the space of the object, double-glued from a biconcave negative lens 9 and a biconvex positive lens 10.

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 I and second II components — the positive meniscus 1 and the positive double-glued lens from the negative meniscus 2 and the positive biconvex 3 lenses, forming an imaginary enlarged image, introducing negative spherical aberration, position chromatism and increases to whom.

Further, component III of lenses 4, 5 and 6 form an imaginary enlarged image, reducing astigmatism and curvature, spherical aberration and compensating for the coma.

Component IV lenses 7 and 8 build an image of the object in the focal plane of component V, correcting magnification chromatism, astigmatism, and curvature.

Component V of lens 9 and 10 transfers the image of the object to infinity, forming a plan-chromatic high-contrast image of the object.

According to the proposed scheme, a micro lens with a magnification of 63 ^x , a numerical aperture of 0.9, a linear image field of 25 mm and a working distance increased by 1.3 times compared with the prototype (in the prototype 0.516, in the claimed technical solution 0.8 mm) is implemented.

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

Table 1 Rel image value Strehl number one 0.82 0.866 0.86 0.707 0.88 0.5 0.9 0 0.9

INFORMATION SOURCES

1. USSR Copyright Certificate No. 1695256, IPC: G02B 21/02, publ. November 30, 1991

2. USSR Author's Certificate No. 1485184, IPC: G02B 21/02, publ. 06/07/1987 - a prototype.

Claims (2)

1. Plano-chromatic micro-lens of large magnification, containing five components in series, the first of which is made in the form of a positive meniscus convex to the image space, the second component is made in the form of a positive double-glued lens, consisting of a negative and positive biconvex lenses, the third positive component, consisting of three lenses, the fourth component is made in the form of a positive double-glued lens, consisting of a positive biconvex lens and a negative meniscus, convex to the image space, and the fifth component, made in the form of a negative two-glued meniscus, characterized in that the negative lens of the second component is made in the form of a negative meniscus, convex into the space of the object, the third positive component is made in the form of a single positive biconvex lens and glued from the negative biconcave and positive biconvex lenses, and the negative two-glued meniscus of the fifth component is generally n concavity in the space of the object and is made in the form of a biconcave negative and biconvex positive lenses. 2. The large-scale plano-chromatic micro lens according to claim 1, characterized in that the refractive index of the positive meniscus of the first component has a value of 1.8≤n _d ≤1.85, and its dispersion coefficient is 42≤ν _d ≤47.

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