RU126482U1 - Ocular of the world - Google Patents

Abstract

A microscope eyepiece containing a plano-convex lens facing a exit pupil with a flat surface whose convex surface is aspherical with the surface equation y = 2rz- (1-e) z, where r is the radius of curvature at the vertex of the surface; y, z are the coordinates of the aspherical surface, and lies in the range 1.1 ÷ 1.5, characterized in that a plane-parallel plate is installed in front of the lens, consisting of plane-convex and plane-concave lenses made of optical materials, for which the difference in refractive indices for the main length in The wavelength n (λ = 0.546 μm) does not exceed 0.002, and the difference in the coefficients of the average dispersion ν exceeds 20.

Description

The proposed utility model relates to optical instrumentation, and more specifically to the microscope eyepieces.

The well-known orthoscopic microscope eyepiece (AM-18), given in the book by G.E. Skvortsov, V.A. Panov and others. "Microscopes", ed. Engineering, Leningrad, 1969, p. 235. The eyepiece contains two positive components. The first consists of three glued lenses, and the second is a plano-convex lens facing a exit pupil with a flat surface.

Known orthoscopic eyepiece with a remote exit pupil, application for the grant of a patent of the Russian Federation for invention No. 2008121054, G02B 20/00, publ. 12/10/2009. The orthoscopic eyepiece with the exit pupil removed, contains the negative and positive components, while the first component contains two negative lenses located symmetrically relative to each other, the second component contains two positive lenses located symmetrically relative to each other.

The disadvantages of these eyepieces are the complexity of the optical scheme, imperfect image quality at the edge of the field and insufficient removal of the exit pupil.

The closest in technical solution and selected as a prototype is the microscope eyepiece, RF patent for utility model No. 100640, G02B 25/00, publication date 12/20/2010.

The microscope eyepiece is a plano-convex lens with a flat surface facing the exit pupil, glued from a plano-concave and biconvex lens, the convex surface of the biconvex lens is aspherical with the equation y ² = 2r ₀ z- (1-e ² ) z ² , where r ₀ is the radius of curvature at the top of the surface, y, z are the coordinates of the aspherical surface, and e ¹ is in the range 1.1 ÷ 1.5, and the lenses are made of optical materials for which the difference in refractive indices for the main wavelength n _e (λ = 0.546 μm) does not exceed 0.002, and the coefficient difference The average dispersion ν _e exceeds 20.

A disadvantage of the known eyepiece is the insufficient removal of the exit pupil and the unsatisfactory correction of field aberrations.

The objective of the utility model is to create an optical scheme of the eyepiece with increased removal of the exit pupil to ensure comfortable viewing conditions, including with glasses, as well as with high correction of field aberrations.

The solution to this problem is achieved by the fact that the optical system of the microscope eyepiece includes a plano-convex lens facing a exit pupil with a flat surface, and its convex surface is aspherical with the surface equation y ² = 2r ₀ z- (1-e ² ) z ² , where r ₀ - the radius of curvature at the vertex of the surface, y, z - coordinates of the aspherical surface, and e ² in the range 1.0 ÷ 1.5, and mounted parallel plate in front of it, consisting of a plano-convex and plano lenses made of optical materials for which pa NOSTA refractive index n _e for the fundamental wavelength (λ = 0.546 microns) does not exceed 0.002, and ν _e 20 exceeds the difference of average dispersion coefficients.

The introduction into the optical scheme of the microscope eyepiece mounted in front of a plane-convex lens of a plane-parallel plate of plane-convex and plane-concave lenses made of optical materials with the above characteristics allows creating an eyepiece with increased exit pupil removal and improved correction of field aberrations.

The combination of all the features allows us to solve the problem, the exclusion of any of them leads to the inability to implement the microscope eyepiece with increased removal of the exit pupil and improved correction of field aberrations.

The essence of the utility model is illustrated in the drawing and tables. The drawing shows an optical diagram of the microscope eyepiece.

Table 1 shows the design parameters of the microscope eyepiece, table 2 shows the technical characteristics, tables 3 and 4 show the residual aberrations: table 3 shows the aberrations of a point on the axis in the reverse direction, and table 4 shows the aberrations of the main beam in the reverse direction.

The microscope eyepiece contains a plane-parallel plate of plane-convex 1 and plane-concave 2 lenses located along the radiation and a plane-convex lens 3 facing the exit pupil with a flat surface.

Table 1. No. r mm d mm Glass mark n _e ν _e 0 Air 1.000000 0.0 one ∞ 7.0 STK9 1.746048 50.05 2 -14.41 2.0 TF4 1.746231 27.95 3 00 1.0 Air 1.000000 0.0 four 18.6512 * 5.0 STK9 1.746048 50.05 5 ∞ Air 1.000000 0.0 *) - aspherical surface, e ² = 1.227 Table 2. Feature Name Value

, кратVisible increase

, krat 10 Focal Length, f ', mm 25 Angular field, 2ω, gr. pl 42.40 The diameter of the exit pupil, D ', mm one Table 3. h mm tg □ ' Δs', mm Δy ', mm η% S '_F' -S '_C' 0.5 2 -0.01542 -0,00031 -0.0296 -0.16263

0.3536 1,414 -0.00771 -0.00011 -0.0148 -0.16268 0 0 0 0 0 -0.16273 Table 4. ω, gr pl S _p mm S ' _p mm y 'mm z ' _m mm z ' _s mm z ' _m -z' _s mm

y '_F' -y '_C' mm 21.20 -29.6 147 9.90 -1.27 -1.27 0.00 1.4 0 15.26 -28.0 147 6.95 -0.59 -0.59 0.00 0.7 0.011 0 -26.4 147 0 0 0 0 0 0

, фокусным расстоянием f'=25 мм, диаметром выходного зрачка D'=1 мм, линейным полем в пространстве изображений 2y'=20 мм, коэффициентом видимого поля K=2y'

..An example of a specific implementation of the proposed utility model is a microscope eyepiece with a visible increase

, focal length f '= 25 mm, exit pupil diameter D' = 1 mm, linear field in the image space 2y '= 20 mm, visible field coefficient K = 2y'

..

The technical advantage of the proposed utility model, in comparison with the prototype is:

- increased removal of the exit pupil;

- high correction of field aberrations. The implementation of the technical advantages of the claimed eyepiece when used in microscopes allows you to increase their technical level.

Claims (1)

A microscope eyepiece containing a plano-convex lens facing a exit pupil with a flat surface, the convex surface of which is made aspherical with the surface equation y ² = 2r ₀ z- (1-e ² ) z ² , where r ₀ is the radius of curvature at the top of the surface; y, z are the coordinates of the aspherical surface, moreover, e ² lies within 1.1 ÷ 1.5, characterized in that a plane-parallel plate is installed in front of the lens, consisting of plane-convex and plane-concave lenses made of optical materials for which the difference in refractive indices for the main wavelength is n _e (λ = 0.546 μm) does not exceed 0.002, and the difference in the coefficients of the average dispersion ν _e exceeds 20.

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