SU1089538A1 - Magnifying glass - Google Patents

Abstract

BOTTLE, which contains three lenses / first of which are positive, facing concavity to; subject, the second is a two-bucket lens, and a third is a single lens, from a lens so that, in order to improve image quality across the field and carry out the exit pupil, the positive meniscus is made double-glued, the double cock-pup lens is single, and a single lens is in the form of a negative lens, and the dispersion coefficients of the materials of the dual-glued lens are referred to as ltl, 5i

Description

/; "

This invention relates to optical systems designed for visual detection of small objects.

The four-lens-loop is known, containing 1: three sets, the first of which is a single positive meniscus, the second positive meniscus glued together from negative and positive lenses, and the third is a positive meniscus C13

However, this magnifying glass has a low image quality across the field and a small distance from the exit pupil from the last surface of the magnifying glass.

A magnifying glass is known, containing three lenses, the first of which is a positive meniscus facing its concavity towards the object, the second is a two-co-convex lens, and the third is a single LENSG S2 3.

However, this magnifying glass has a low image quality, for example, the spot was scattered in the plane of the object, calculated in the reverse direction of the inclined beam W 12.5, with a pupil diameter of 3 mm and for three wavelengths (D, s, F) in terms of loupes are over 2 arc min. In addition, the secondary pupil at the magnifying glass is rendered by an amount not exceeding the focal length. This position of the exit pupil causes discomfort in the work. For example, when installing a magnifying glass on the machinery, the small pickup of the exit pupil, with the center of which the center of rotation of the eye must be aligned, causes an uncomfortable working posture. The distance from the center of rotation of the eye, from the calculated size of the output of the pupil, leads to a sharp deterioration in image quality.

In addition, this magnifying glass has an unavoidable coma and a mismatch of chromatic aberration of magnification across the field. The axial dispersion spot (geometric) has a diameter of 0.0012 mm or in terms of

through magnifying a magnifying glass 4 in the angular measure (an unjustifiably small value, since the minimum angular resolution of the eye is 60), and the spot for tilting has dimensions of 5 0.0364x0.0418 mm (or).

The purpose of the invention is to improve the image quality across the field and take away the exit pupil.

The goal is achieved

0 by the fact that in a magnifying glass containing three lenses, the first of which is a positive meniscus facing a concavity towards the object, the second is a two-co-convex lens, and a third is a single lens

S positive meniscus is made double-glued, the double-nucleus lens is single, and the single lens is in the form of a negative lens, with materials dispersion coefficients

The first two-glue lenses relate

 as 1: 1.5.

FIG. 1 shows the optical design of the magnifier in FIG. 2 types of spots scattered by a loop (calculated in the reverse direction of the plane of the best image, spaced from the Gauss plane by -O., 334 mm) given by the axial and oblique {W 12 j beam, respectively.

The loop consists of the first positive meniscus in the form of glued negative 1 and positive 2 lenses, the second positive single lens 3, the third flat-concave negative single lens 4.

5 for the loupe, the axial spot has a diameter of 0.0166 mm (or 1 2, which corresponds to the minimum angular resolution of the eye), and the spot for tilting W 12 has dimensions of 0.031 x

0 x 0.0315 mm (39).

Thus, the proposed magnifier has an increased image quality across the field compared with the prototype with (by 15-25%) and the exit pupil's removal is 1.9 points.

focal length

loops

, 5 .0 h-uS

Y {mn)

Fyu

U (MP)

Off X (PL)

Claims (1)

A magnifying glass containing three lenses, the first of which is a positive meniscus _t facing concavity to _; to the subject, the second is a biconvex lens, and the third is a single lens, from which the lens is clear in that, in order to improve image quality across the field and the exit pupil, the positive meniscus is double-glued, the biconvex lens is single, and single lens - in the form of a negative lens, and the dispersion coefficients of the materials of the double-glued lens are 1: 1.5.