RU29787U1 - Night-vision device - Google Patents

Abstract

1. The night-vision device containing a sequentially located lens, an electron-optical converter and a collimating system, as well as a pseudobinocular telescopic system, including a unit for splitting the light flux into two identical beams and two eyepieces, characterized in that the collimating system is made of two sequentially arranged components , each of which contains a meniscus, convex towards the electron-optical transducer, and a biconvex lens, pseudobinocular the leskopic system additionally contains the first and second teams located respectively in front of the first and second eyepieces, and the luminous flux splitting unit into two identical beams is made in the form of a rectangular prism placed behind the second component of the collimating system, behind which reflective surfaces, forming two identical beams, are installed in series respectively, the first and second three-lens lenses, and the first and second flat mirrors. 2. The night vision device according to claim 1, characterized in that the rectangular prism, the first and second three-lenses and the first and second flat mirrors are housed in a separate removable housing, the optical axis of which coincides with the optical axis of the lenses, and the rectangular prism is mounted to rotate around the optical axis, and three-lenses - with the possibility of their movement along the optical axis.

Description

2002131810

- 3, v, ff02B23 / I2

DEVICE NIGHT

The proposed device relates to optical instrumentation, in particular, to night vision devices (night vision devices) and can be used to observe objects in low light conditions, in particular, at twilight at night.

Known night vision device (night vision goggles), consisting of sequentially mounted on the optical axis of the first flat mirror, a lens, an Electron Optical Transducer (EOP) and pseudobinocular ocular system, consisting of sequentially installed second and third flat mirrors, lens wrap-around system, cube -prism conjugating two optical branches at its output, one of which consists of a sequentially installed rectangular prism AR «90 ° and the first eyepiece, and the other of prisms s Dove and the second eyepiece, (see Pat. ROT No. 86/00334, e02B23 / 12, 1985).

The disadvantage of this device is its significant longitudinal dimension (80 mm), which leads to a relatively large load on the facial and occipital muscles of the operator, causing him fatigue. In addition, the presence of a cube “prisms and Dove prisms does not allow to obtain a satisfactory image quality.

Known PNV - binocular night vision telescope containing sequentially arranged lens, image intensifier, aberration corrector, collimating system and pseudobinocular telescopic system, consisting of an additional (202B23 / 02 lens, a unit for splitting the light flux into two

identical beam, two rhombic prisms and two eyepieces. The splitting unit of the light flux into two identical beams is a beam splitting mirror. Both diamond prisms have an apex angle of 30 ° and are made of glass with a refractive index of less than 1.6. (see Pat. RF № 2143717, (J02B23 / I2, 1998). This device, as the closest to the proposed optical design, is taken as a prototype.

The disadvantage of the optical protector of the prototype is the significant vignetting of wide inclined beams, which leads to a decrease in the illumination in the image at the edge of the field of view. This reduces the quality of the observed image.

The proposed device solves the problem of creating a NVD with a pseudobinocular system with high quality optical images.

To solve this problem, in the well-known NVD, which contains a sequentially arranged objective lens, an image intensifier tube, and a collimating system, as well as a pseudobinocular telescopic system, including a unit for splitting the light flux into two identical beams and two eyepieces, the collimating system is made of two sequentially arranged components, each of which contains a meniscus, convex towards the image intensifier tube, and a biconvex lens, the pseudobiaocular telescopic system additionally contains the first and second teams, the size respectively, in front of the first and second eyepieces, and the splitting unit of the light flux into two identical beams is made in the form of a rectangular prism placed behind the second component of the collimating system, behind the reflective surfaces of which, forming two identical beams, the first and second three-line d /

2.

zoom lenses and the first and second flat mirrors.

For convenience, in: improving the quality of alignment, the rectangular prism, the first and second three-lens lenses, and the first and second flat mirrors are housed in a separate removable housing, the optical axis of which coincides with the optical axis of the lenses, the lenses being mounted with the possibility of their movement along the optical axis, and a rectangular prism - with the possibility of rotation around the optical axis.

The invention is illustrated in the drawing, which shows the optical scheme of the proposed NVD.

The inventive PNV contains a sequentially located lens I, image intensifier 2, a collimating system consisting of two components 3 and 4, each of which contains a meniscus convex towards the image intensifier 2, and a biconvex lens, and a pseudobinocular telescopic system. The pseudobinocular telescopic system contains at the input a block splitting the light flux into two identical beams, made in the form of a rectangular prism 5 located behind the second component 4 of the collimating system. Behind the reflective surfaces of prism 5, the first 6 and second 6 three-lenses, nepBsae, and second 7 flat mirrors are installed respectively. Behind the flat mirrors 7 and 7, collectives 8 and 8 and eyepieces 9 and 91 are respectively placed along the beam.

The proposed NVD works as follows.

Lens I creates a zebra aive: :) image of the observed object on the photocathode of the image intensifier tube. Image intensifier tube 2 transforms the IR image b -: dyame. The light beams emanating from the screen of the image intensifier tube 2 are converted by the components 3 and 4 of the collimating system into a parallel light flux incident on the reflecting surfaces of the primitive prism 5, as a result of which

t ,, / y / y / f /

splitting of a light stream into two identical beams. Having passed through three-lenses 6 and bati beams, respectively, they fall onto flat mirrors 7 and, which turn the light beams incident on them by 90 and direct them to collectives 8 and 8, and then to eyepieces 9 and 9, through which you can observe the image of the object in visible spectral range, constituents 8 and 8 reduce the vignetting of oblique beams, as a result of which the object image observed through the eyepieces has almost the same illumination over the entire field of view. Thus, the proposed optical NVD circuit allows improving the quality of the observed image.

An additional feature of the claimed NVD is the convenience of adjusting the device, which is ensured by the placement of a prism 5, lenses b and bi flat mirrors 7 and 7 in a separate detached housing. This allows you to pre-assemble and align the three-lens lenses b and b, and then install the aligned lenses b and b, a rectangular prism 5 and flat mirrors 7 and 7 in a removable housing and adjust their relative position before aligning the device as a whole. The final adjustment of the device is greatly simplified. Mutual alignment of elements 5, b, bi 7, 7 in a removable housing is provided by rotation around the optical axis of prism 5 and the possibility of movement along the optical axis of lenses b and b.

The model of the proposed device was made and tested.

t) b and its optical characteristics are investigated.

Thus, the proposed design provides an increase in image quality due to almost the same illumination over the entire field of view and a decrease in the labor-time of assembly of the device due to the simplification of the alignment process.

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Deputy Director of S1SB TNV for scientific work 111 NI

, //, 6 II E.M. Amelin

Claims (2)

1. The night-vision device containing a sequentially located lens, an electron-optical converter and a collimating system, as well as a pseudobinocular telescopic system, including a unit for splitting the light flux into two identical beams and two eyepieces, characterized in that the collimating system is made of two sequentially arranged components , each of which contains a meniscus, convex towards the electron-optical converter, and a biconvex lens, pseudobinocular the leskopic system additionally contains the first and second teams located respectively in front of the first and second eyepieces, and the luminous flux splitting unit into two identical beams is made in the form of a rectangular prism placed behind the second component of the collimating system, behind which reflective surfaces, forming two identical beams, are installed in series respectively, the first and second three-lenses, and the first and second flat mirrors. 2. The night vision device according to claim 1, characterized in that the rectangular prism, the first and second three-lenses and the first and second flat mirrors are housed in a separate removable housing, the optical axis of which coincides with the optical axis of the lenses, and the rectangular prism is rotatably mounted around the optical axis, and three-lenses - with the possibility of their movement along the optical axis.