RU188678U1 - MIRROR-LENS LENS - Google Patents

Abstract

The mirror-lens lens consists of two spherical, convex and concave, concentric mirrors, in the center of which the aperture diaphragm is located. Near the diaphragm there is a double-glued aplanatic meniscus with a linear increase of 1, the lenses of which are made of optical materials for which the difference in refractive indices for the average wavelength does not exceed 0.001, and the difference in the coefficients of average dispersion exceeds 20. The ratio of the radii of curvature of the convex and concave mirrors can be. EFFECT: correction of the surface curvature of the image and spherical aberration. 1 hp f-ly, 1 ill., 4 tab.

Description

The proposed utility model relates to optical instrument making, and more specifically to mirror and mirror-lens lenses.

Known mirror-lens lenses, optical schemes which are given, for example, in the monographs GG. Slusarev "Calculation of optical systems", ed. L .: Mashinostroenie, (Leningrad. Otd-tion), 1975, 640 s, D.S. Volosova, "Photographic Optics", ed. M .: Art, 1978, 543 p.

The disadvantages of these lenses include the imperfect correction of the curvature of the image surface and spherical aberration and the complexity of the optical circuits.

The closest technical solution to the claimed utility model is a two-mirror concentric lens, given in the book by G.G. Slusarev "Calculation of optical systems", which is adopted by the authors as a prototype of the utility model.

The prototype includes two spherical, convex and concave, concentric mirrors, in the center of the curvature of which the aperture diaphragm is located. Due to this, coma, astigmatism and distortion are corrected in such a scheme.

The disadvantage of the known prototype is a significant curvature of the surface of the image and spherical aberration, reducing the image quality.

The problem to be solved by the claimed utility model is the creation of a mirror-lens lens with a corrected curvature of the surface of the image and spherical aberration.

The solution of this problem is achieved by introducing an aplanatic meniscus with a linear increase of 1 ^x , glued together from two optical materials, in which the difference in refractive indices does not exceed 0.001, and the difference in the average dispersion coefficients exceeds 20, and located behind the mirror part of the lens in a converging beam of rays, and the ratio magnitude of the radius of the mirrors

The exclusion of any of them leads to the impossibility of implementing an optical system with a corrected curvature of the image surface and spherical aberration.

Introduction of an aplanatic meniscus with a linear increase of 1 ^x from the specified pair of optical materials allows to compensate for the curvature of the surface introduced by the mirror part, while achromatization of the aplanatic meniscus is performed by selecting optical materials and optical forces of the positive and negative lenses, and the specified ratio of the radii of the mirrors provides correction for spherical aberration.

The essence of the utility model is illustrated by the figure.

The lens contains sequentially located (Fig.) Along the beam mirror part 1, consisting of two spherical, convex and concave, concentric mirrors, in the center of curvature of which there is a diaphragm, and a two-glued aplanatic meniscus 2 with a linear increase of 1 ^x , located near the diaphragm.

The operation of the lens / mirror lens is as follows. A parallel beam of rays passes through the mirror part 1, after which the convergent beam of rays passes through the double-glued aplanatic meniscus 2 and is collected in the back focus of the lens.

An example of a specific implementation of a utility model is a mirror-lens lens with a focal length ƒ '= 100 mm;

и угловым полем 2ω = 20°.relative hole

and an angular field of 2ω = 20 °.

Table 1 presents the design parameters, table 2 technical characteristics, residual aberrations in tables 3 and 4.

The technical advantage of the proposed utility model in comparison with the prototype is an improved correction of the curvature of the image surface and spherical aberration, which allows to increase the angular field and the relative aperture.

The implementation of technical advantages will allow you to create a mirror-lens lenses for various applications for the visible UV and IR regions of the spectrum.

Legend of the values in table 3 and 4:

h - pupil coordinate;

tgσ '- tangent of aperture angle;

Δs 'and Δy' are the longitudinal and transverse components of the spherical aberration for the main wavelength;

η - deviation from the condition of isoplanatism, which determines coma;

W - wave aberration;

ω - the value of the object;

y 'is the size of the image;

- меридиональная и сагиттальная составляющие астигматизма;

- meridional and sagittal components of astigmatism;

- астигматизм;

- astigmatism;

Δ - distortion;

y _{F '} - y _C' - magnification chromatism.

Claims (2)

1. A lens consisting of two spherical, convex and concave, concentric mirrors, in the center of the curvature of which there is an aperture diaphragm, characterized in that a two-glued aplanatic meniscus with a linear magnification of 1 ^x is installed near the diaphragm, the lenses of which are made of optical materials, for which the difference refractive index for the average wavelength does not exceed 0.001, and the difference between the coefficients of the average dispersion exceeds 20. 2. The lens on p. 1, characterized in that the ratio of the values of the radii of curvature of the convex and concave mirrors is

.

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