RU28779U1 - High aperture planochromatic microscope lens - Google Patents

Description

- g o (G 2 1 2 t 5 8 g

IPC: G 02B 21/02

High aperture planochromatic microscope lens

The proposed utility model relates to the field of optical instrumentation and can be used to complete laboratory, research, biological and other microscopes, including such as LUMAM - F, LUMAM RPO - 11, 12, etc.

Plano-chromatic microscope lenses differ from micro-lenses / other types in the relatively high image quality over the entire field in one plane, so they can be used in conjunction with such receivers as photographic film, a charge-coupled electronic receiver (CCD), etc.

Most known planochromats have a numerical aperture of less than 1 1, 2,; 3.4 Immersion micro lenses are known, the numerical aperture of which reaches 1.2 - 1.4. They have high image quality, but differ in the complexity of optical schemes that use triple-bonded lenses.

Recently, some modern micro-lenses have been required to provide the ability to control the size of the aperture during operation to fine-tune the contrast of the observed object. Structurally, this can be achieved by introducing an iris diaphragm (ID) into the optical circuit of the lens. Obviously, none of the above

above micro lenses it cannot be equipped with an ID mechanism due to the density of the layout within the limited height standard (45 mm).

Closest to the claimed technical solution is a planochromatic microscope objective 5, functionally consisting of three components, the first of which is a group of three lenses of positive optical power, the first of which is made in the form of a glued positive lens, the second is in the form of a positive meniscus facing concavity to subject, the third - in the form of a biconvex lens, the second - positive, consisting of one triple-glued and two double-glued lenses and the third, formed by two double-glued lenses negative menisci oriented concave surfaces towards each other. The lens has high image quality in the center and across the field and is distinguished by a large magnification.

The disadvantages of the lens include the density of the layout of its optical scheme, which does not allow you to set the iris diaphragm, which provides control of the aperture size and contrast of the observed object, as well as the presence of a three-glued lens component,

the manufacture of which with the necessary accuracy is

I technologically challenging problem.

The main task that the proposed utility model is aimed at is providing the ability to control the size of the aperture during operation to fine-tune the contrast of the observed object and simplify the optical design of the lens.

To solve this problem, a planochromatic microscope objective, as well as a prototype, consists of three components sequentially located along the rays, the first of which includes a positive bonded lens and a positive meniscus facing a concave surface to the object, the second positive component consisting of three lenses, the second of which is positive, glued from the negative and positive biconvex lenses, and the third of the positive optical strength1, is glued from the positive biconvex and itsatelnoy lenses, and a third component consisting of two negative menisci.

Unlike the prototype, the positive meniscus of the first component is made of glued from the positive and negative menisci, the first

the lens of the second positive component is double-glued

/ positive lens and negative meniscus, while in the third

component, the first negative meniscus is glued from the positive and negative menisci, and the second negative meniscus faces the image with a concave surface, in addition, an iris diaphragm is located between the second and third components, and for the distance between these components the following relation holds:

, M ,,, 5 /

where f about - the focal length of the lens without a tube lens, and the dispersion coefficients of the optical materials of the second component are in the range:

U (S.AiHi-,

(P) 100,

, p (II) 31

where Vnojr (n) are the Abbe numbers of the optical materials of the positive lenses of the second component; VoTp (II) -Abbe numbers of optical materials of the negative lenses of the second component.

The essence of the claimed utility model lies in the fact that the implementation of the second component from two glued lenses allows

significantly reduce the input aperture in front of the second component when

/ decrease in chromatism increase (HRH), including due to which the first

the lens of the second component is double-glued (in the prototype it is tri-glued), and changing the orientation of the second negative meniscus of the third component allows you to increase the distance between the second and third components, where the aperture diaphragm is installed, which allows you to control the size of the aperture during operation for accurate

adjusting the contrast of the observed object.

The essence of the claimed lens is illustrated in the drawing, where in FIG. 1 presents the optical scheme of the lens and the Appendix, which gives the design parameters and optical characteristics of a particular sample.

The proposed planochromatic high-aperture micro lens consists of three components, the first of which I includes a positive glued lens 1 and a positive glued meniscus 2, facing a concave surface to the object, and the second II is positive, containing

element 3 glued from the positive lens and the negative meniscus, the surface curved toward the image is glued together, the element 4 is glued from the negative and positive biconvex lenses, element 5 is glued from the positive and biconvex and negative lenses, the side with the greater curvature is turned toward the object, the third component is III negative optical power, consisting of two negative glued menisci 6 and 7, facing concave surfaces to the image. Between components II and III, there is an iris diaphragm 8, which limits the aperture of the system.

The principle of operation of the proposed lens is as follows.

/ Positive component I, which is an aplanatic system

relative to the axial point of the subject, significantly reduces the input aperture from 1.3 to 0.25 - 0.3 without contributing to the coma and building an imaginary image with a magnification of 5x. Component II introduces an increase in chromatism that is opposite in value to the HRI of the first part, while the absence of three-glued lenses is determined by the corrective participation in the HRI correction of the first component and the rational distribution of the compensating

loads on its elements in combination with the use of combinations of such optical materials in gluings, the dispersion coefficients of which are in the range: (P) 100,

, p (II) 31

where Vnon (II) is the Abbe number of optical materials of positive lipts of the second component; VoxpCH) Abbe numbers of optical materials of the negative lenses of the second component

The third component III reduces the residual curvature of the image surface. The location and orientation of the menisci of this component is selected from the need to obtain the most compact system, so that the distance between the II and III components of the lens is sufficient to install an iris diaphragm that allows you to control the size of the aperture during operation to fine-tune the contrast of the observed object.

Thus, the resulting lens meets the requirements

/ planochromatic system when working with a receiver based on 2/3 CCD

matrix, does not contain triple-glued lenses in the optical structure and provides the installation of an iris diaphragm. In addition, the optical materials used in it have a low intrinsic luminescence.

 6 1. 2. 3. 4. 5. I Sources of information Russian Federation Patent No. 2104576, IPC: G 02B 21/02, Japanese Patent No. 6044103, IPC: G 02B 21/02, 1985. US Patent No. 4232940, IPC : G 02B 3/00 Japan Patent No. 6044102, IPC: G 02B 21/02, 1985. Japanese Patent No. 5067004, IPC: G 02B 21/02, 1985 - prototype.

Claims (1)

Plano-chromatic high-aperture microscope objective, consisting of three components arranged sequentially along the rays, the first of which includes a positive glued lens and a positive meniscus facing a concave surface to the object, the second positive component consisting of three lenses, the second of which is positive, glued from negative and positive biconvex lenses, and the third positive optical power is glued from the positive biconvex and negative lenses, and the third component, with consisting of two negative menisci, characterized in that the positive meniscus of the first component is glued from the positive and negative menisci, the first lens of the second positive component is double-glued from the positive lens and the negative meniscus, while in the third component the first negative meniscus is glued from the positive and negative menisci, and the second negative meniscus faces the concave surface of the image, in addition, between the second and third components of the races an iris diaphragm is laid, while for the distance between these components d _II-III the relation

where f _about - the focal length of the lens without a tube lens, and the dispersion coefficients of the optical materials of the second component are in the range: 90≤ν _floor (II) ≤100, _Neg 24≤ν (II) ≤31, where ν _floor (II) is the Abbe number of the optical materials of the positive lenses of the second component; ν _neg (II) - the Abbe number of the optical materials of the negative lenses of the second component.