SU1700519A1 - Microscope eye-piece - Google Patents

Abstract

The invention relates to optical instrument making, namely to the eyelets of microscopes. The purpose and purpose of this is to improve the image quality by increasing the magnitude of the linear field. The ocular p of the microscope contains a positive meniscus 1 facing the object with a concavity, a negative meniscus 2 convex facing the object, a single double convex lens 3.4, a double angled lens 5. The focal length of the eye is f 23.0 mm, the output diameter pupil Dp 2 m distance from the first surface i to the object S -14.41 mm, distance from the last surface to the exit pupil Sp 18.52 mm, linear field 2 20 mm, the length of the eyelet L 31.64 mm. 1 il.

Description

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

The aim of the invention is to improve image quality with increasing £ of the linear field.

Spherical aberration in the entire spectral range does not exceed 0.1 mm. Transverse spherical aberration does not exceed 0.004 mm. Image curvature and 1 astigmatism are equal to _t ω = -21 ° 25 '; Z _t '= -0.723 mm; Zs = -0.741 mm;

Zs - Zt = -0.018 mm;

ω = -15 ° 47; Zt = -0.414 mm; Zs = -0.0465 mm;

j Zs - Zt = -0.051 mm. 1

The drawing shows an optical diagram of the microscope eyepiece.

The scheme consists of a positive meniscus 1 facing concavity to the object, a negative meniscus 2 facing convex to the subject, single: biconvex lenses 3 and 4, biconcave (lens 5 and exit pupil 6.

(The eyepiece is the last link in the optical system transmitting the image directly to the eye of the observer.

The plane of the objects is located at a distance of 0.58 f'ocular, which coincides with the front focal plane.

The rays of light pass sequentially 3 through lenses 1-5, the image is obtained at infinity. The rays of light passing from the object completely fill the exit (pupil of the eyepiece 6, with which the observer's eye is combined. The exit pupil is located at a distance of 0.75 f 'of the eyepiece from the last surface of the eyepiece.

Example. The eyepiece of the micro * osprey is calculated with the following characteristics: focal length f '= 25.0 mm; exit pupil diameter Dp = 2 mm; the distance from the first surface to the subject S = = -14.41 mm; distance from the last surface to the exit pupil Sp = 18.52 mm; linear field 2y = 20 mm; eyepiece length L = 31.64 mm.

An important advantage of the proposed microscope eyepiece is the good image quality and the increased size of the linear field. This eyepiece has a small amount of distortion (1%), a small magnitude of astigmatism, which does not exceed 0.07 mm, and an almost complete absence of chromatic aberrations.

Claims (1)

Claim A microscope eyepiece containing a negative meniscus facing concavity to the image, two biconvex lenses and a negative lens, characterized in that, in order to improve image quality with increasing linear field, a positive meniscus is introduced in front of the negative meniscus, facing the concavity to the image, the negative lens is made biconcave, all eyepiece lenses are single, while positive lenses are made of glass with a refractive index of at least 1.6 and an average dis rsii at least 60, and negative lens - with a refractive index not less than 1.7 and an average dispersion ratio of not more than 28.