SU1365026A1 - Telescopic reflector - Google Patents

Abstract

The invention relates to alignment devices for the alignment and control of optical devices and allows for the expansion of technological adaptability while maintaining the invariance of the direction of the reflected beams. Between equal focal lenses and 2 are placed along the beam of pentapriem 3 and rectangular prism 4, the optical axis is bent by 180 without disturbing the invariance of the direction of the reflected beam. The rhombus prisms 5 and 6 installed in front of the lenses I and 2 shift the parallel light beam incident on them by an amount equal to the size of their refracting faces. The change in the center distance of the incoming and outgoing beams is carried out by rotating the rhombus prisms 5 and 6 around the optical axes of objectives I and 2. In the front focal plane of objective 1 there is an aperture stop 7, which coincides with the entrance pupil of the system whose exit pupil 8 is located on the outer edge of the rhombus prism 6. 1 ill., I table. 2- .6 / - (L with Od ell about 1C O)

Description

The invention relates to optical instrumentation, namely to fitting devices for alignment and control of optical devices.

The purpose of the invention is to expand the technological adaptivity while maintaining the invariance of the direction of the reflected beams by changing the distance between the incoming and outgoing beams.

The drawing shows the optical layout of the device.

The telescopic reflector with a magnification equal to one is made in the form of two equally focal lenses 1 and 2, between which pentaprism 3 and a rectangular prism 4 are mounted along the beam, and prism 5 and 6 are installed in front of lenses 1 and 2 and can be rotated around optical the axes of the lenses, the aperture aperture 7 being located in the front focal plane of the input lens 1, which coincides with the outer refractive edge of the rhombus 5 located in front of this lens.

The aperture diaphragm 7 coincides with the entrance pupil of the system, and the exit pupil 8 is located on the outer refractive edge of the rhombus prism 5.

Telescopic reflector works as follows.

A parallel beam of light passes through a rhombus prism 5, which shifts it parallel to itself by an amount equal to the size of the refractive face of rhombus prism 5, and directs it into the objective 1, which focuses the stream in its back focal plane that coincides with the front focal plane of the objective 2. In this case, the prisms 3 and 4 carry out a kink in the optical axis by 180, without violating the invariance of the direction of the reflected beam. The parallel beam of radiation emerging from the lens 2 is shifted by a rhombus-prism 6 by an amount equal to the value of the refractive edge of the rhombus-prism 6.

The rotation of the rhombus prisms 5 and 6 around the optical axes of the lenses 1 and 2 allows changing the axial distance of the incoming and outgoing beams in the range from b to (-. Using the pentaprism 3 and the rectangular prism 4 keeps the direction of the incident and

reflected beams are identical in two mutually perpendicular ryos planes ,.

An example of the overall calculation of the telescopic reflector.

The drawing indicates the following design parameters:

A is the distance from the main plane of the lens to the optical axis perpendicular to the optical axis of the lens;

B — reflector base without rhombus prisms or the distance between the optical axes of lenses 1 and 2;

C is the distance from the main plane of the lens to the refracting face of the corresponding diamond prism;

D is the distance between the refractive faces of myrhombus prisms;

E is the value of the refractive edge of rhombus prisms.

Then

2A -I- in + P 2f

(I)

where P is the increment of the beam path due to the glass of prisms 3 and 4 plus an additional amount of motion in the pentaprism 3.

C + (E + D) n f,

(2)

where n is the refractive index of the glass from which the diamond prism is made.

In 1 (mmi + b „„ ,,), (3).

B - (b ,, c- b ,,, J. (4)

If the angle of inclination of the reflecting face of rhombic prisms 5 and 6 is 45, then

D - given expressions determine the overall dimensions of the telescopic reflector at 40 mm; Ñm x 400 mm.

Setting C from structural considerations to 12.6 mm, we calculate from expression (2) to calculate the focal length of the f 210 mm lenses.

When the size of the entrance face of a penta-prism is 20 mm, the value of P is equal to 54.8 mm. Substitute the known values in expression (I), determine the value of A.

And 72.6 mm.

In the proposed example, the prisms are made of glass grade K8.

The parameters of lenses 1 and 2 are given in the table.

32.5 7.0

1.5163 K 8 I, 6475 TF 1

13650264

Focal distance f 210 mm; relative aperture 1: 7; angular field of vision 2 oj 12 °.

Claims (1)

Invention Formula ten 1B 0 A telescopic reflector containing an optical system with a magnification equal to one, characterized in that, in order to expand technological adaptability while maintaining the invariance of the direction of reflected beams, the optical system is made in the form of two equally focal lenses, between which a pentaprism and square prism, and diamond lenses are installed in front of the lenses with the possibility of rotation around the optical axes of the lenses, with the aperture diaphragm located on the outer refractive index the verge of one of the rhombus prisms.