RU2010279C1 - Eye-piece of microscope - Google Patents

Abstract

FIELD: optical instrumentation. SUBSTANCE: eye-piece of microscope has positive meniscus facing object space with concavity, positive and negative meniscus cemented together and plano-convex lenses facing each other with convexities and having same design data. EFFECT: facilitated manufacture, improved operational characteristics. 6 dwg

Description

 The invention relates to optical instrumentation, namely to the eyepieces of microscopes.

 A microscope eyepiece is known that contains the collective and ophthalmic components with a field diaphragm located between them, while the collective component contains two identical plano-convex lenses, and the ophthalmic component contains two positive lenses, the first of which is plano-convex, convex to the plane of objects, a similar plano-convex is introduced into the collective component a lens, all the lenses of the first component face flat surfaces to the object, and the second lens of the eye component is made in the form of a meniscus, the concavity is reversed go to the image space.

 A wide-angle microscope eyepiece is known, containing two single lenses, a positive meniscus facing concavity to the space of images, glued from biconvex and biconcave lenses, the first two lenses are identical in the form of menisci facing concave surfaces to the space of objects, or in the form of plane-convex lenses facing flat sides to the space of objects.

 As a prototype, an eyepiece was selected that contains a double-glued meniscus, the lenses of which are made in the form of positive and negative menisci, and two identical single plano-convex lenses facing convex surfaces to each other.

 But this eyepiece does not provide the required image quality, has significant spherical aberration of wide inclined beams of rays.

 The essence of the invention lies in the fact that the eyepiece of the microscope contains a double-glued meniscus, the lenses of which are made in the form of positive and negative menisci, and two identical single plane-convex lenses facing convex surfaces to each other, the double-glued meniscus is made positive and facing concavity to the space of objects.

 The aim of the invention is to improve image quality with a large extension of the exit pupil.

 The double-glued meniscus is positive and concave toward the space of objects, which ensures the correction of spherical aberration both for a point on the axis and for a wide inclined beam of rays.

In the above calculation, all positive lenses are made of TK16 glass with n _e = 1.6152; ν _e = 58.09, and the negative meniscus is made of TF4 glass with n _e = 1.7462 and ν _e = 27.95. This made it possible to correct chromatic aberrations, both position chromatism and increase chromatism.

 Thanks to the choice of glasses, the chromatism of magnification is eliminated in the microscope eyepiece, therefore this eyepiece is intended for use with achromatic lenses, which have eliminated the chromaticity of magnification, that is, with CF lenses.

The microscope eyepiece is compact, its length is ≈ f _ok , the eyepiece has a focal plane extended forward, which makes it possible to use it not only for observation but also for photographing.

Eyepieces with the following optical characteristics are given as specific examples: Focal length f _ok = 25 mm f _ok = 15.6 mm Visible magnification Γ = 10 ^x Γ = 16 ^x Spacing of the exit pupil S _p = 24.3 mm S _p = 16, 4 mm Front working distance S = -10.6 mm S = -7 mm Linear field 2y = 20 mm 2y = 12 mm Diameter of the exit pupil ⌀ _exit = 2 mm ⌀ _out.sp. 1.5 mm
In the above calculation, the microscope eyepiece with an increase in G = 10 ^x has the following aberrations.

 The longitudinal spherical aberration for the entire spectral range does not exceed 0.046 mm, and the transverse spherical aberration does not exceed 0.001 mm.

 The neuroplanasia coefficient on the edge of the pupil is 0.015%, in the zone - 0.008%.

Image curvature and astigmatism: ω = -21 ^o 42 'Z _t = -0.257 mm Z _s = - 0.92 mm Z _s -Zt = -0.663 mm ω = -17 ^o 47' Z _t = -0.263 mm Z _s = - 0.597 mm Z _s -Z _t = - 0.334 mm
Chromatism of increase: edge of the field - 0.006 mm, zone - 0.007 mm.

 The mean square wave aberration for a point on an axis in the plane of the best setting is 0.067 λ.

The mean square wave aberration over the field in the plane of the best setting is equal to:
y 'W _rms
10 0.186
8.66 0.098
7.07 0.063
5.0 0.063
0. 0.067
The value of the mean-square wave aberration in the spectral interval, field and pupil is equal to:
excluding defocus and distortion 0.068λ;
excluding defocusing, distortion and image curvature 0.059 λ.

In the above calculation, the microscope eyepiece with a magnification of 16 ^x has the following aberrations.

 The longitudinal spherical aberration for the entire spectral range does not exceed 0.022 mm, and the transverse spherical aberration does not exceed 0.0008 mm.

 The coefficient of neusoplanasia on the edge of the pupil is 0.022%, in the zone - 0.011%.

Image curvature and astigmatism are equal: ω = -21 ^о 48 'Z' _t = -0.198 mm Z ' _s = -0.584 mm Z' _s -Z't = -0.386 mm ω = -15 ^o 30 'Z't = - 0.187 mm Z's = -0.283 mm Z ' _s -Z' _t = -0.334 mm
Chromatism of increase: edge of the field - 0.0002 mm, zone - 0.0005 mm.

 The mean square wave aberration for a point on an axis in the plane of the best setting is 0.051 λ.

The mean square wave aberration over the field in the plane of the best setting is equal to:
at the 'W _sr.kv.

10.0.088
8.66 0.056
7.07 0.044
5.0 0.045
0 0,051
The value of the mean-square wave aberration in the spectral interval, field and pupil is equal to:
excluding defocus and distortion 0,043 λ;
excluding defocusing, distortion and image curvature 0.033 λ.

In FIG. Figure 1 gives an optical diagram of a microscope eyepiece with Г = 10 ^х with structural data, where I is a positive meniscus facing concavity to the space of objects, glued from positive 2 and negative 3 menisci, 4 and 5 are plano-convex lenses convex to each other, s the same structural data, 6 - exit pupil of the eyepiece.

In FIG. 2 presents a table of aberrations of the eyepiece with G = 10 ^x , in FIG. 3 - graphs of its aberrations.

In FIG. 4 gives an optical diagram of a microscope eyepiece with G = 16 ^x with structural data; in FIG. 5 - tables of aberrations of the microscope eyepiece with G = 16 ^x ; in FIG. 6 - graphs of its aberrations. (56) Copyright certificate of the USSR N 1365021, cl. G 02 B 25/00, 1988.

 USSR author's certificate N 330417, cl. G 02 B 25/00, 1970.

Claims (1)

 Ocular Microscope, containing a double-glued meniscus, the lenses of which are made in the form of positive and negative menisci, and two identical single plano-convex lenses, turned convex side to side, characterized in that, in order to improve the image quality, the output is large apart positive and turned concavity to the space of objects.

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