SU1658114A1 - Planapochromatic objective lens of microscope - Google Patents

Abstract

The invention has been proposed to visually examine and photograph low-contrast microscopic structures that are at the limit of the resolution of light microscopes. The proposed lens is intended for use in universal research models of microscopes equipped with all modern methods of examining objects in natural light, in polarized light, in the light of visible luminescence, using light floor, dark floor, phase and anoptral contrast, and others. is an increase in the information capacity of the image as a result of the correction of the curvature and the chromatic difference of magnifications with increasing numerical aperture and linear field. The goal is achieved by the fact that the third component is made of three-glued two double convex extreme lenses and a two-concave middle, the fourth one is made as a two-convex positive lens, and a double-sided meniscus is inserted behind the fourth component, convex to the object, composed of a two-convex and b. two-concave lenses. The material with positive lenses of the second, third, and fourth components was selected with a material with a coefficient of dispersion of 95 V to V4 V, i 70, and as a material of lenses of a duplex meniscus, glasses having 35 iv51 65 V525 4D. In addition, to better correct the spherical aberration in oblique beams, the ratio of the outer radii of curvature of the first and last meniscus 1.83t ™ 1.5; 2.6 1.7, and the radii of curvature of the glued surfaces of the component is 1.25 5- ™ 0.6. 1 il. (L o ate OS

Description

The invention relates to a class of optical systems with diffraction limited image quality - plan-achromatic microscope lenses, intended for visual examination and photographing of low-control microscopic structures, elements of which approach the maximum resolution of light microscopes.

The aim of the invention is to increase the information capacity of the image by correcting the curvature of the image and the chromatic difference of magnification with increasing numerical value.

aperture and linear floor in the space of images.

The drawing shows the principal optical layout of the lens.

The proposed lens contains a single negative front meniscus 1, convex facing the image, a two convex lens 2, a three-lens glued component 3, a single two convex lens 4 and a dual glued meniscus 5 convex to the object.

The lens works as follows.

The front meniscus 1 builds an enlarged imaginary image of the object with moderate values of axial point aberrations and compensatory values of the meridial and sagittal curvature. A double-cap lens 2 and a three-lens glued component 3 project an image of an object with an additional magnification

V,.,,

at the same time, component 3 compensates for the chromatic 25 difference of positions introduced by the elements 1, 2 ,, 4,5. A single double-convex lens 4 builds an image of the object in the front focal plane of the double-glue meniscus 5, which further projects the image of the object to infinity, compensating for the residual values of astigmatism from the curvature of the lens image, as well as the residual chromatic difference of magnifications and the secondary spectrum.

35

In accordance with the proposed technical solution, the calculation of the 40x0.75 planar-oprochromatic lens was made. The lens has a high image quality ™ across the entire linear field of 2 by 25 mm. So, across the entire field of view of the lens, the value of the Strel number is iz50,8.

g45

Such large values of the determinative brightness cause a high concentration of energy in the center of the diffraction spot, and consequently, a high image contrast over the entire field of observation.

The chromatic difference of magnifications in the lens is

0

five

five

°

which allows you to develop a wide angle eye, mm and realize a high information capacity of the image of the lens. Thus, the information capacity of an image in a microscope is increased "by a factor of 10 compared with commercially available

Claims (2)

1. Planapochromatic microscope lens containing four components, the first of which is a negative meniscus convex to the image, the second is a single two-convex lens, and the third is a glued component containing a glass of heavy flint as a negative lens material, and The quality of the material is a positive fluorite lens, characterized in that, in order to increase the information capacity of the image by correcting the curvature and chromatic difference of magnifications with increasing numerical aperture and l a third field, the third component is made of a three-glued two two-convex lenses with a double-curved lens located between them, the fourth component is a two-convex lens, and after it a two-glued meniscus is introduced that convexly faces an object consisting of a two-convex and two for the material of the positive lenses of the second, third, and fourth components, a material with a dispersion coefficient of 95 7 () was chosen, and glasses with 55 V5 /: b 40 as the material of the lenses of a duplex meniscus. 2. A lens according to claim 1, characterized in that the ratio of the outer radii of curvature of the first and last meniscus is 1.80 to 1.50; 2.60 E | 1 1.70 and the radii of curvature of the glued surfaces of the third component 1, 20 -), 60.