RU212902U1 - OIL IMMERSION MICROSCOPE LENS - Google Patents

Abstract

, при этом

. Объектив микроскопа имеет исправленный хроматизм увеличения, что дает улучшенное качество изображения, и данный объектив может использоваться с обычными окулярами, а не с компенсационными, что позволяет сократить номенклатуру при комплектации оптики микроскопов, а также с матричными приемниками оптического излучения. 4 табл.

The proposed utility model relates to optical instrumentation, and more specifically to immersion lenses of microscopes. The objective of an oil immersion microscope contains six components located along the propagation of radiation, the first of which is a plano-convex positive lens, the second is a single positive meniscus with its concavity facing the object space, the third is a positive double-glued lens containing a negative meniscus with its concavity facing the image space , and a biconvex positive lens, the fourth - a positive double-glued lens containing a negative meniscus, concavity facing into the image space, and a biconvex positive lens, the fifth and sixth components, which are plane-parallel plates located at a finite distance from each other and glued from plano-convex and concave-flat lenses, moreover, the refractive indices for the average wavelength of the optical materials of the lenses in plane-parallel plates are the same, and the differences in the average dispersion coefficients of the lenses in both plates are equal, but opposite opposite signs

, wherein

. The microscope objective has a corrected magnification chromatism, which gives improved image quality, and this objective can be used with conventional eyepieces, and not with compensation ones, which allows reducing the range of microscope optics, as well as with matrix receivers of optical radiation. 4 tab.

Description

The proposed utility model relates to optical instrumentation, and more specifically to immersion lenses of microscopes.

Known microscope lens oil immersion 90×1.25 (OM-41), given in the monograph "Microscopes" ed. Engineering, 1969, author. Polyakov N.N. and others. The specified lens includes four components sequentially located along the rays, the first of which is a plano-convex positive lens, the second is a single positive meniscus, concavity facing into the object space, the third is a positive double-glued lens containing a negative meniscus, concavity facing into image space, and a biconvex positive lens, the fourth is a positive double-glued lens containing a negative meniscus, concavity facing into image space, and a biconvex positive lens. The lens has achromatic correction, high entrance aperture and high linear magnification. Its disadvantages include the fact that the magnification chromatism is not corrected and reaches 2%, and it also has a linear magnification of 90 ^× and a parfocal height H = 33 mm, which do not meet the requirements of modern standards for microscope objectives.

Known oil immersion microscope lens (RF patent No. 2010227, IPC G02D 21/02, priority date 04/25/1991, publication date 03/30/1994), containing a single plano-convex lens, a positive biconvex lens with equal radii, a negative meniscus glued from biconvex and biconcave lenses, a second positive single biconvex lens, a positive meniscus facing the image space with its concavity and glued from convex-flat and plano-concave lenses, and a tube lens. Its disadvantages include a large number of components and not fully corrected magnification chromatism of -0.24%.

The closest to the claimed utility model is the lens of the oil immersion microscope 100 × 1.25MI (OX-32), the optical design of which is described in the article by L.N. Andreev "Synthesis of the elemental optical base of microscopes", published in the Optical Journal, No. 4, 2000, which was adopted by the authors as a prototype. The lens contains four components arranged in series along the path of the rays, the first of which is a plano-convex positive lens, the second is a single positive meniscus, the concavity facing into the object space, the third is a positive double-glued lens containing a negative meniscus, the concavity facing the image space, and a biconvex positive lens, the fourth - a positive double-glued lens containing a negative meniscus, concavity facing into the image space, and a biconvex positive lens. The lens has achromatic correction, high entrance aperture and high linear magnification. The disadvantage of this lens is uncorrected magnification chromatism, reaching 2%.

The objective of the claimed utility model is to create an oil immersion microscope lens with corrected magnification chromatism, which makes it possible to obtain an image with improved quality.

- коэффициенты средней дисперсии плосковыпуклой и вогнутоплоской линз первой гиперхроматической линзы,

- коэффициенты средней дисперсии плосковыпуклой и вогнутоплоской линз второй гиперхроматической линзы, при этом

. Указанная совокупность признаков позволяет реализовать оптическую схему объектива микроскопа масляной иммерсии с исправленным хроматизмом увеличения.The solution of this problem is achieved by the fact that in the oil immersion microscope lens, which contains four components located along the propagation of radiation, the first of which is a plano-convex positive lens, the second is a single positive meniscus, the concavity facing the object space, the third is a positive double-glued lens, containing a negative meniscus with its concavity facing into the image space and a biconvex positive lens, the fourth one is a positive two-glued lens containing a negative meniscus with its concavity facing into the image space and a biconvex positive lens, after the fourth component the fifth and sixth components are introduced, which are plane-parallel plates, located at a finite distance from each other and glued from plano-convex and concave-planar lenses, and for the optical materials of lenses in plane-parallel plates, the following conditions are satisfied: refractive indices for the average its wavelengths are the same, and the differences in the average dispersion coefficients of the lenses in both plates are equal, but of opposite signs

are the average dispersion coefficients of the plano-convex and concave-flat lenses of the first hyperchromatic lens,

are the average dispersion coefficients of the plano-convex and concave-flat lenses of the second hyperchromatic lens, while

. The above set of features makes it possible to implement the optical scheme of an oil immersion microscope lens with corrected magnification chromatism.

, обеспечивают коррекцию хроматизма увеличения. Выполнение условия равенства показателя преломления для основной длины волны n_D всех линз в плоскопараллельных пластинках не нарушает коррекции монохроматических аберраций. Исключение любого из них ведёт к невозможности реализации оптической системы.Plano-parallel plates located at a finite distance from each other, glued from plano-convex and concave-flat lenses made of optical materials, for which the difference between the average dispersion coefficients of the plano-convex lens and the concave-flat lens in both plane-parallel plates are equal, but of the opposite sign

, provide correction for magnification chromatism. The fulfillment of the condition of equality of the refractive index for the fundamental wavelength n _D of all lenses in plane-parallel plates does not violate the correction of monochromatic aberrations. The exclusion of any of them leads to the impossibility of implementing the optical system.

The combination of all features allows us to solve the problem, the exclusion of any of them leads to the impossibility of implementing an oil immersion microscope lens with corrected magnification chromatism.

The essence of the utility model is illustrated by the drawing, where the figure shows the optical scheme of the oil immersion microscope lens.

The oil immersion microscope objective contains six components, the first of which is a plano-convex positive lens 1, the second is a single positive meniscus 2, with its concavity facing into the object space, the third is a positive double-glued lens 3, containing a negative meniscus, with its concavity facing into the image space, and a biconvex a positive lens, the fourth is a positive double-glued lens 4, containing a negative meniscus, turned by concavity into the image space, and a biconvex positive lens, the fifth is a plane-parallel plate 5, glued from a plano-convex and a concave-flat lens, the sixth is a plane-parallel plate 6, glued from a plano-convex and a concave-flat lens , while the fifth and sixth components are located at a finite distance from each other, and the refractive indices for the average wavelength of the optical materials of the lenses in plane-parallel plates are the same, and the differences in the coefficients of the average dispersion Versions of lenses in both plates are equal, but of opposite signs

The utility model works as follows.

A beam of polychromatic beams with a large numerical aperture emerging from the object plane passes through components 1, 2, 3 and 4 in FIG. and comes out weakly convergent without violating the correction of monochromatic aberrations, but with uncorrected magnification chromatism. Further, when passing through components 5 and 6, there is no violation of monochromatic aberrations and position chromatism, but correction of magnification chromatism occurs.

An example of a specific implementation of the proposed utility model is the calculation of an oil immersion microscope lens 100 × 1.25 MI.

Table 1 shows the design parameters, table 2 - technical characteristics, table 3 - aberrations of a point on the axis, table 4 - aberrations of the main beam.

Table 1. Design parameters of the lens

Turn No. R, mm d,mm Glass brand Cedar oil one ∞ 0.17 K14 2 ∞ 0.156 Cedar oil 3 ∞ 0.92 K8 four -0.787 0.05 5 -6.95 1.2 K8 6 -2.032 0.1 7 22.65 one TF1 eight 6.281 1.75 K8 9 -5.37 1.2 ten 184.93 one TF4 eleven 4.286 2 K8 12 -7.178 one 13 ∞ 1.5 TK14 fourteen -10,593 one F1 fifteen ∞ 27.45 16 ∞ 1.5 F1 17 -7.943 one TK14 eighteen ∞

Table 2 Lens Specifications

Characteristic name Meaning Focal length, mm 1.89 Numerical aperture 1.25 Linear increase, ^× -100 Linear field in image space, mm twenty

Table 3. Aberrations of a point on an axis

h, mm ΔS', mm Δy', mm η, %

, мм

, mm tgσ' 146.05 -4.34 -0.056 -0.13 -2.14 1.288 102.15 0.25 0.003 0.03 -2.10 1.087 71.84 -0.98 -0.009 0.00 -2.04 0.893 45.29 -1.48 0.010 -0.02 -1.96 0.633 0 0 0 0 -1.86 0

Table 4. Aberrations of the main beam

y, mm y', mm z' _m , mm z _'s , mm z _'s - _z'm , mm

, %

, % 0.100 -10.019 -32.93 -29.49 -3.44 -0.03 0.071 -7.058 -17.62 -15.83 -1.79 -0.01 0 0 0 0 0 0

The technical advantage of the presented utility model is that the resulting oil immersion microscope lens, unlike the prototype, has a corrected magnification chromatism, which provides improved image quality. The proposed oil immersion microscope objective can be used with conventional eyepieces, rather than with compensatory ones, which makes it possible to reduce the range when completing microscope optics, as well as with matrix receivers of optical radiation.

Claims (1)

An oil immersion microscope objective, which includes four components located along the propagation of radiation, the first of which is a plano-convex lens, the second is a single positive meniscus, the concavity facing into the object space, the third is a positive double-glued lens containing a negative meniscus, the concavity facing the image space, and a biconvex positive lens, the fourth one is a positive two-glued lens containing a negative meniscus, concavity facing into the image space, and a biconvex positive lens, characterized in that two components are installed behind the fourth component, which are plane-parallel plates located at a finite distance from each other and glued from plano-convex and concave-plane lenses, moreover, the refractive indices for the average wavelength of the optical materials of the lenses in plane-parallel plates are the same, and the differences in the average dispersion coefficients are linear h in both plates are equal, but of opposite signs

, where

are the average dispersion coefficients of the plano-convex and concave-flat lenses of the first hyperchromatic lens,

are the average dispersion coefficients of the plano-convex and concave-flat lenses of the second hyperchromatic lens, while

.

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