RU2631535C1 - Eyepiece - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: eyepiece contains two components, the first of which along the rays - two-lens, glued from the biconcave and the first biconvex lens, the second component - a single second biconvex lens. In the eyepiece, the following relations are performed: |R₄|<|R₅|, |R₂|=|R₃|=|R₄|, |R₁|=|R₅|, where R₁, R₂, R₃, R₄, R₅ - radii of the first, the second, the third, the fourth, and the fifth optical surfaces. The refractive index of the first biconvex lens of the first component is greater than the refractive index of the single second biconvex lens of the second component.

EFFECT: increasing the angular field in the image space, increasing the relative aperture at a high image quality and increased workability.

1 dwg, 2 tbl

Description

The invention relates to optical instrumentation and can be used in the eyepieces of telescopic systems and microscopes, as well as for viewing images of various micromonitors, for example, television or thermal imaging optical systems.

Known three-lens eyepiece described in RF patent No. 2239213, IPC G02B 25/00, publ. 2004, containing two components, the first of which along the rays is a two-lens one, glued from the negative meniscus convex to the object and the first biconvex lens, the second component is the second biconvex lens, and, in addition, there are relations:

| R ₃ | = R ₄ = | R ₅ |,

1,1f '<D <l, 4f',

1.64 <n ₁ <1.78,

1.59 <n ₂ = n ₃ <1.62,

where R ₃ , R ₄ , R ₅ are the radii of curvature of the third, fourth and fifth optical surfaces;

n ₁ , n ₂ , n ₃ - the refractive indices of the material of the first, second and third lenses for line e;

D is the distance from the anterior focal point of the eyepiece to the top of the second surface along the rays of the second biconvex lens;

f 'is the focal length of the entire eyepiece.

This eyepiece has an insufficient angular field in the image space, namely 46 °, a low relative aperture of 1: 4.43, and insufficient manufacturability, since the eyepiece has equality of only three radii of spherical optical surfaces.

The closest analogue to the claimed technical solution is the eyepiece described in RF patent No. 2364901, IPC G02B 25/00, publ. 08/20/2009, containing two components, the first of which along the rays is a two-lens, glued from a biconcave and the first biconvex lens, the second component is a single second biconvex lens, and there are relations:

1.64 <n ₁ <1.78,

1.59 <n ₂ = n ₃ <1.62,

| R ₄ | <| R ₅ |,

| R ₂ | = | R ₃ | = | R ₄ |,

where n ₁ , n ₂ , n ₃ are the refractive indices of the material of the first, second and third lenses for line e;

R ₂ , R ₃ , R ₄ , R ₅ - the radii of the second, third, fourth and fifth optical surfaces.

This eyepiece has an insufficient angular field in the image space of 51 °, a low relative aperture of 1: 4.44, and insufficient manufacturability, since the eyepiece has the equality of only three radii of spherical optical surfaces.

The objective of the invention is the creation of an eyepiece with improved performance with high image quality and high adaptability.

The technical result is an increase in the angular field in the space of images, an increase in the relative aperture with high image quality and high adaptability.

This is achieved by the fact that in an eyepiece containing two components, the first of which along the rays is a two-lens one, glued from a biconcave and the first biconvex lens, the second component is a single second biconvex lens, and in which the following relations hold:

| R ₄ | <| R ₅ |,

| R ₂ | = | R ₃ | = | R ₄ |,

where R ₂ , R ₃ , R ₄ , R ₅ are the radii of the second, third, fourth and fifth optical surfaces, in contrast to the known refractive index of the first biconvex lens of the first component is greater than the refractive index of a single second biconvex lens of the second component, and the equality

| R ₁ | = R ₅ |

where R ₁ is the radius of the first optical surface.

The drawing shows an optical diagram of the eyepiece.

The eyepiece consists of two components sequentially located along the beam from the object, the first of which is glued together from a biconcave lens 1 and the first biconvex lens 2, the second is a single second biconvex lens 3. The exit pupil is behind a single second biconvex lens 3. As a specific an example implementation of the invention designed eyepiece with the following structural parameters:

The eyepiece works as follows:

In front of the lens 1, in the front focus is the plane of objects, the image of which behind the eyepiece is at infinity and is examined by the observer's eye located behind the lens 3.

The calculated eyepiece has the following characteristics:

Eyepiece focal length f ' 17.29 mm Front focal length 7.54 mm Exit pupil diameter 5.5 mm Relative hole 1: 3.14 Angular field in image space 54 deg. Exit pupil removal 18.7 mm

In the table. Figure 2 shows the aberrations of the calculated eyepiece in the reverse ray path for λ = 546 nm.

Thus, as a result of the proposed solution, a technical result is obtained: an eyepiece with an angular field in the image space of 54 ° is created with an increased relative aperture of 1: 3.14 with a high image quality with an increased level of manufacturability.

Claims (6)

An eyepiece containing two components, the first of which along the rays is a two-lens one, glued from a biconcave and the first biconvex lens, the second component is a single second biconvex lens, in which there are relations: | R ₄ | <| R ₅ |, | R ₂ | = | R ₃ | = | R ₄ |, where R ₂ , R ₃ , R ₄ , R ₅ are the radii of the second, third, fourth and fifth optical surfaces, characterized in that the refractive index of the first biconvex lens of the first component is greater than the refractive index of a single second biconvex lens of the second component, and the equality | R ₁ | = | R ₅ |, where R ₁ is the radius of the first optical surface.

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