RU174611U1 - OPTICAL BINOCLE SYSTEM WITH STABILIZED IMAGE - Google Patents

Abstract

The optical system of the binoculars contains a three-component lens, a block of the wrapping system, a rhombus-prism, a rangefinder grid, an eyepiece. The first positive component of the lens contains positive and negative lenses glued together, the second and third components are the positive and negative menisci that are convex to the object. The dispersion coefficients ν of the first, third, and fourth lenses correspond to the condition 50 <ν <70, which is 1.5–2 times less than the ν of the second lens. The relations are satisfied: ƒ '= (1.4 ÷ 1.6) ƒ', ƒ '= (0.4 ÷ 0.5) ƒ', ƒ '= - (0.55 ÷ 0.65) ƒ', ƒ '= (0.85 ÷ 0.95) ƒ', ƒ '= - (0.7 ÷ 0.8) ƒ', L = (0.009 ÷ 0.011) ƒ ', L = (0.2 ÷ 0.3 ) ƒ ', L = (0.07 ÷ 0.09) ƒ', where ƒ ', ƒ', ƒ ', ƒ', ƒ ', ƒ' are the focal lengths of the lens, glued lens, first lens, second, third and the fourth meniscus; L, L, L - the distance between the first and second, first and third components, between the third component and the block of the wrapping system. The absolute value of the optical power of the second component is 1.05–1.15 times, and the third component is 1.20–1.35 times the optical power of the lens. The light diameter of the first lens is 1.35 ÷ 1.5 times the length of the lens. The technical result is a reduction in the longitudinal size of the optical system, a decrease in weight and size parameters. 1 tablet, 1 ill.

Description

Optical binocular system with image stabilization

The utility model relates to the field of optical instrumentation, namely to large-scale binocular systems with image stabilization of observed objects, and can be used to create such observational devices as binoculars and telescopes.

Known binoculars stabilized series BSM [BSM, 2000, Zagorsk Optical and Mechanical Plant, TU 4471-016-07516244-2000], which is designed to monitor distant objects and objects with the image stabilization system turned on and off. The optical system of each channel of this observational device contains a one-component lens installed along the rays, consisting of two glued lenses - a positive biconvex lens and a negative concave meniscus facing a concavity to the object, a two-prism unit of the wrapping system, a diamond prism, a field diaphragm, a three-component eyepiece, the composition of which includes the first biconvex lens, glued together a second negative meniscus, convex to the object, and a third positive convex-convex lens, fourth flat-convex lens convex to the subject. The stabilized binoculars of the BSM series have the following technical characteristics:

- an increase in binoculars G = 20 ^X ;

- angular field of view in the space of objects 2ω = 3,15 °;

- the rear focal length of the lens at a wavelength of λ = 546 nm ƒ ' _about = 245.35 mm;

- the relative aperture of the lens D _sp / ƒ = 1: 4.9;

- the exit pupil is removed from the last surface of the eyepiece to a distance of 11.06 mm and has a diameter of 2.0 mm;

- resolution limit at the center of the angular field 4.5``;

- movement of the eyepiece by 1 diopter 0.16 mm;

- directional transmittance of at least 75%.

The optical system of binoculars with image stabilization BSM, providing the above characteristics, has a longitudinal size equal to L = 228.73 mm, which leads to large dimensions and weight of a hand-held observation device used on a moving base. In addition, in this device there are no means of assessing the distance to the observed objects.

The objective of the utility model is to create an optical system of high magnification binoculars with image stabilization, which does not differ in technical characteristics from the prototype of the BSM series, but which has reduced weight and size parameters.

The technical solution to this problem is an optical system of binoculars with image stabilization, each optical channel of which contains a three-component lens installed along the rays, the first component of which is made in the form of a positive biconvex lens and a negative concave meniscus that is concave to the subject, and the second and third components glued together - in the form of single positive and negative lenses, a two-prism unit of the wrapping system, consisting of a prism with a roof and two reflecting surfaces VKR - 45 ° and prisms with two reflections BU - 45 °, a rhombus-prism with two reflections BS - 0 °, a three-component eyepiece, which includes the first biconvex lens, glued together a second negative meniscus convex to the object, and a third positive biconvex lens, a fourth plano-convex lens convex to the object, and in one of the optical channels between the rhombus-prism and the eyepiece a field diaphragm is installed.

The technical result is due to the distinctive features of the optical system of binoculars with image stabilization, which include:

1. the composition of the lens, which contains, in addition to the first component - a glued lens, consisting of a first positive biconvex lens and turned by a concave surface to the object of the second negative concave meniscus, located sequentially along the propagation of rays along the optical axis:

but. the second component in the form of a third positive convex meniscus facing a convex surface to an object;

b. the third component in the form of a fourth negative concave meniscus facing a convex surface;

2. lens material — all lenses are made of various grades of glass, and the dispersion coefficient ν _{С of the} first, third and fourth lenses of the lens satisfies the condition 50 <ν _С <70, which is 1.5–2 times less than the dispersion coefficient of the material of the second lens;

3. The focal lengths of the lens and the lenses of the lens are in the following ratios:

ƒ ' _ccl = (0.4 ÷ 1.6) ƒ',

ƒ _'1 = (0,4 ÷ 0,5) ƒ' ,

ƒ ' ₂ = - (0.55 ÷ 0.65) ƒ',

ƒ ' ₃ = (0.85 ÷ 0.95) ƒ',

ƒ _'4 = - (0,7 ÷ 0,8) ƒ ',

where ƒ ', ƒ' _squl , ƒ ' ₁ , ƒ' ₂ , ƒ ' ₃ , ƒ' ₄ are the focal lengths of the lens, the glued lens, the first positive biconvex lens, the second negative meniscus, the third positive meniscus and the fourth negative meniscus, respectively;

4. the distance between the first and second components of the binocular lens with image stabilization is L _1ob = (0.009 ÷ 0.011) ƒ ', and the distance between the first and third components is L _2ob = (0.2 ÷ 0.3) ƒ';

5. The distance between the third lens component and the prism relaying system - L _pos = (0,07 ÷ 0,09) ƒ ';

6. the absolute value of the optical power of the second component of the lens exceeds the optical power of the lens by 1.05 ÷ 1.15 times, and the absolute value of the optical power of the third component of the lens exceeds the optical power of the lens by 1.20 ÷ 1.35 times;

7. the light diameter D _{sv1 of the} first lens of the lens and the total length of the lens L _about are in the ratio:

1.35 <L _r / D _vs1 <1.5.

The invention is illustrated by the drawing, which shows an optical scheme of binoculars with image stabilization. The proposed optical system of binoculars with image stabilization includes:

1. lens 1 is a four-lens design consisting of a positive biconvex lens 5 glued with a negative meniscus 6, single positive meniscus 7 and a negative meniscus 8. Moreover, convex surfaces of a larger radius of the biconvex lens 5, positive meniscus 7 and negative meniscus 8, as well as concave negative meniscus surface 6 facing the subject;

2. a block of a prism wrapping system 2, consisting of two reflective prisms 9, 10;

3. rhombus-prism 11 of the prism system 3, which serves to extend the eyepieces in accordance with the interpupillary distance of the observer;

4. a rangefinder grid 12 installed in one of the optical channels of the binoculars and a field diaphragm 17 installed in the other optical channel of the binoculars;

5. the eyepiece 4, the design of which includes a biconvex lens 13, a glued component consisting of a negative meniscus 14 and a biconvex lens 15, and a single positive plano-convex lens 16;

6. exit pupil 18, where the eye of the observer is located.

The maximum longitudinal size of the optical system of the binoculars with image stabilization along the optical axis is L = 184.46 mm.

The principle of operation of the optical system of binoculars with image stabilization is as follows. The luminous flux from the surrounding space passes sequentially through the lens 1, the block of the prism wrapping system 2, the rhombus-prism 11 of the prism system 3 and focuses in the image plane where the rangefinder grid 12 and the field diaphragm 17 are installed. The resulting image is transmitted through the eyepiece 4 and the exit pupil 18 to the observer.

The introduction of a positive meniscus 7 and a negative meniscus 8 into the design of the lens 1, the choice of the optical forces and materials of the newly introduced lenses reduce the longitudinal size of the binocular optical system with image stabilization, as well as compensate for the longitudinal chromatism of the lens 1.

The prismatic wrapping system 2 in the binoculars with image stabilization is installed with the possibility of rotation around two mutually perpendicular axes lying in the plane perpendicular to the optical axis of the binoculars, which allows you to save the position of the sighting axis of the binoculars used in the stabilization mode by an observer on a moving base.

The prism system 3, which consists of two reflective diamond-prisms 11, installed along the rays after the blocks of the prism wrapping system 2, is provided with the possibility together with the rangefinder grid 12 / field diaphragm 17 and the eyepieces 4 to rotate around an axis parallel to the optical axis of the binoculars, which allows adjust the distance between the exit pupils 18 in accordance with the interpupillary distance of the observer.

1. design parameters shown in the table:

2. the longitudinal size of the optical system of the binoculars with image stabilization L = 184.46 mm;

3. optical characteristics of binoculars with image stabilization:

- an increase in binoculars G = 20 ^X ;

- angular field of view in the space of objects 2ω = 3.4 °;

- the rear focal length of the lens at a wavelength of λ = 546 nm ƒ ' _about = 240.5 mm;

- the relative aperture of the lens D _sp / ƒ = 1: 4.8;

- the exit pupil is removed from the last surface of the eyepiece by a distance of 10.5 mm and has a diameter of 2.6 mm;

- resolution limit at the center of the angular field 4.5``;

- movement of the eyepiece by 1 diopter 0.16 mm;

- directional transmittance of at least 75%.

The technical result of the implementation of the proposed utility model is an optical system of binoculars with image stabilization, providing optical characteristics of the binoculars identical to the optical parameters of the prototype, but differing from the prototype by a 20% reduction in longitudinal size. The reduction of the longitudinal size of the optical system leads to a decrease in the length of the observing device, and, as a consequence, a decrease in its mass due to a reduction in the length of the binocular casing. Moreover, the total mass of the four lenses introduced into the design of the lenses is not significant compared with the mass of binoculars, reduced by reducing the longitudinal size of the optical system.

The design parameters of the proposed technical solution are implemented in commercially available binoculars with image stabilization. The above technical characteristics of the optical system of the manufactured binoculars fully satisfy the functional requirements and purpose of such observing devices as binoculars.

Claims (1)

The optical system of binoculars with image stabilization, comprising a three-component lens, a two-prism wraparound system, a rhombus-prism, a three-component eyepiece, installed along the rays of the beam, the first positive component of the lens made in the form of a first positive biconvex lens glued together and facing the subject of the second negative lens in the form of a concave meniscus, and in one of the channels of the optical system between the rhombus-prism and the eyepiece there is a rangefinder grid, characterized the fact that, in order to reduce the longitudinal size of the optical system, a second component is installed in the lens behind the glued lens — a third positive lens in the form of a convex meniscus facing the convex surface to the object, and a third component — the fourth negative lens in the form of a concave meniscus facing the convex surface to the subject, and all the lenses of the lens are made of various grades of glass with a dispersion coefficient ν _{С of the} first, third and fourth lenses that satisfy the condition 50 <ν _С <70, which is 1.5 ÷ 2 times less than the coefficient the dispersion coefficient of the material of the second lens of the lens, the focal lengths of the lens and its lenses are in the ratios ƒ ' _ccl = (1.4 ÷ 1.6) ƒ', ƒ ' ₁ = (0.4 ÷ 0.5) ƒ', ƒ ' ₂ = - (0.55 ÷ 0.65) ƒ ', ƒ' ₃ = (0.85 ÷ 0.95) ƒ ', ƒ' ₄ = - (0.7 ÷ 0.8) ƒ ', where ƒ ', ƒ' _ccl , ƒ ' ₁ , ƒ ₂ ', ƒ ' ₃ , ƒ' ₄ are the focal lengths of the lens, the glued lens, the first positive biconvex lens, the second negative meniscus, the third positive meniscus and the fourth negative meniscus, respectively, the distance between the first and a second lens component L _1ob = (0,009 ÷ 0,011) ƒ ' , the distance between the first and third component E _2ob lens L = (0,2 ÷ 0,3) ƒ ' , the distance between the third component of the lens system and the prism relaying L _pos = (0,07 ÷ 0,09) ƒ' , the absolute value of optical power of the second lens component exceeds the optical the lens power is 1.05 ÷ 1.15 times, the absolute optical power of the third lens component is 1.20 ÷ 1.35 times the optical power of the lens, the light diameter D _{sv1 of the} first lens of the lens and the total length of the lens L _about are in the ratio 1 , 35 <L _rev / D _sv1 <1.5.

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