A compact wide-field white light sight optical system

Abstract

The invention discloses a compact wide-field white light sight optical system, which adopts a Kepler telescope system, including an objective lens group, an image transfer group, a graticule and an eyepiece group; the objective lens group adopts 2 groups of 3 spherical lenses, the image transfer group adopts 3 groups of 5 spherical lenses, and the image transfer group is arranged behind the image plane of the objective lens group; the graticule is arranged behind the image transfer group, and the eyepiece group adopts 3 groups of 5 spherical lenses, including an eyepiece first lens group, an eyepiece second lens group and an eyepiece third lens group. The white light sight optical system has good imaging quality, no sensitive size, good lens processing technology, reasonable optical element arrangement, compact structure, small size, strong engineering feasibility, and has practical application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical instruments, and in particular relates to a compact wide-field white light sight optical system, which can improve human-machine efficiency, effectively reduce system weight, and is conducive to improving shooting accuracy, and is applied to aiming, observing, shooting, etc. on shooting equipment. Background Art

[0002] Most of the existing white light sights have long dimensions, are relatively heavy, and have relatively complex structures. They cannot simultaneously meet the requirements of wide field of view, light weight, compact system, and resistance to salt spray environments, resulting in poor adaptability to some light weapon platforms. Summary of the invention

[0003] The present invention overcomes the deficiencies of the prior art and provides a compact wide-field white light sight optical system, which, while ensuring comprehensive image quality, improves system transmittance and corrosion resistance, reduces system weight and volume, and improves human-machine efficiency, thereby facilitating high-quality imaging and improving shooting accuracy.

[0004] The technical scheme adopted by the present invention is as follows: a compact wide-field white light sight optical system adopts a Kepler telescope system, comprising an objective lens group, an image transfer group, a graticule and an eyepiece group; the objective lens group adopts two groups of three spherical lenses, comprising an objective lens first lens group and an objective lens second lens group; the image transfer group adopts three groups of five spherical lenses, the image transfer group is arranged behind the image plane of the objective lens group, plays a positive image role, and comprises an image transfer first lens group, an image transfer second lens group and an image transfer third lens group; the graticule is arranged behind the image transfer group, and the graticule engraved surface is located on the image plane; the eyepiece group adopts three groups of five spherical lenses, comprising an eyepiece first lens group, an eyepiece second lens group and an eyepiece third lens group; wherein the front surface of the objective lens first lens group is coated with an anti-salt spray film, the substrate of which is a K9 material, and the rear surface of the eyepiece third lens group is coated with an anti-salt spray film, the substrate of which is a quartz material.

[0005] Furthermore, the optical parameters of the sight optical system are: magnification not less than 5.1 times, field of view not less than 8.1°, entrance pupil diameter not less than φ26mm, exit pupil distance not less than 36mm, and total optical length not greater than 137mm.

[0006] Furthermore, the first lens group of the objective lens is a cemented lens, with curvature radii of 54.38, -26.06 and -133.05 respectively, positive and negative optical powers respectively, center thicknesses of 7.6 mm and 2 mm respectively, and materials of crown glass and flint glass respectively; the second lens group of the objective lens has curvature radii of 26.239 and 62.74 respectively, positive optical power, center thickness of 5 mm, and material of lanthanide crown glass; the interval between the first lens group of the objective lens and the second lens group of the objective lens is 0.4 mm.

[0007] Furthermore, the focal length of the objective lens group is 42.1 mm, and the field of view is not less than 8.1°.

[0008] Furthermore, the first image-transmitting lens group has a curvature radius of -19.31 and -12.078, respectively, a positive optical power, a center thickness of 2.8 mm, and is made of lanthanum crown glass; the second image-transmitting lens group 4 is a cemented lens, with a curvature radius of 40.05, -7.87, and -20.51, respectively, a positive and negative optical power, respectively, a center thickness of 4 mm and 1.2 mm, respectively, and is made of lanthanum crown glass and flint glass, respectively; the third image-transmitting lens group 5 is a cemented lens, with a curvature radius of 9.1, 28.65, and 7.87, respectively, a positive and negative optical power, respectively, a center thickness of 4.6 mm and 2.7 mm, respectively, and is made of crown glass.

[0009] Furthermore, the magnification of the image relay group is -2.36, which not only magnifies the image of the objective lens group by 2.36 times, but also makes the inverted image formed by the objective lens group upright; the intervals between the optical elements in the image relay group are 0.3 mm and 0.29 mm respectively.

[0010] Furthermore, the scale lines of the reticle are composed of a rough distance measurement scale with a base line of 2.3 meters vehicle height, a rough distance measurement scale with a base line of 1.7 meters human height, a shooting distance scale, a combined measurement and aiming scale, and a fine-position scale.

[0011] Furthermore, the curvature radius of the first lens group of the eyepiece is -21.95 and -14.74 respectively, the optical power is positive, the center thickness is 4.3mm, and the material is lanthanide crown glass; the second lens group of the eyepiece is a cemented lens, the curvature radius is -96.38, 19.51 and -24.6 respectively, the optical power is negative and positive respectively, the center thickness is 2mm and 9.7mm respectively, and the materials are flint glass and crown glass respectively; The front surface of the third lens group of the eyepiece is spherical with a curvature radius of 23.23, and the rear surface is aspherical. The aspherical parameters are: R=-1541.7, k=0, A=1.4899247E-005, B=3.4635233E-009, C=5.3520921E-014, D=-3.287265E-012, the optical power is positive, the center thickness is 6.5mm, and the material is quartz glass.

[0012] Furthermore, the focal length of the eyepiece group is 19.5 mm, the magnification is not less than 12.8 times, the exit pupil diameter is not less than φ5.1 mm, the exit pupil distance is not less than 36 mm, and the diopter is adjustable; the intervals between the optical elements in the eyepiece group are 0.3 mm and 0.3 mm respectively.

[0013] The beneficial effects of the present invention are embodied in the following aspects:

[0014] (1) The field of view of the optical system of this daylight sight can reach more than 8°, and combined with the graticule lines consistent with the shooting table data of the shooting equipment, it can accurately aim at the target more than 2 km away, which is more in line with the shooting requirements.

[0015] (2) The optical system of the present invention introduces aspheric surfaces and uses glass materials with high refractive index to reduce the number of optical elements, making the structure compact and the size miniaturized while correcting aberrations. Compared with similar systems, the weight of the optical system of the present invention can be reduced by 30% and the length can be reduced by 25%, greatly increasing the practicality and adaptability of the sight.

[0016] (3) The optical system of this white light sight is made of highly transparent and corrosion-resistant optical materials, and a high-transmittance film is plated on the surface of the optical lens. The system transmittance can be as high as 88% or more. An anti-salt spray film is plated on the front surface of the first lens group of the objective lens and the rear surface of the third lens group of the eyepiece, which greatly improves the sight's ability to resist salt spray and corrosion and enhances the environmental adaptability of the sight.

[0017] (4) The optical system of this white light sight has good imaging quality, no sensitive size, good lens processing technology, reasonable arrangement of optical components, compact structure, small size, strong engineering feasibility, and practical application value. In addition, the materials of the objective lens group, image transfer group, reticle and eyepiece group optical components are all commonly used materials, with relatively good economic efficiency, which is conducive to mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram of the optical system of the present invention.

[0019] Figure 2 It is a point diagram of the optical system of the present invention.

[0020] Figure 3 It is a spherical aberration curve diagram of the optical system of the present invention.

[0021] Figure 4 It is a relative illumination diagram of the optical system of the present invention.

[0022] Figure 1 Middle: 1. Objective lens first group, 2. Objective lens second group, 3. Image transfer lens first group, 4. Image transfer lens second group, 5. Image transfer lens third group, 6. Graticule, 7. Eyepiece first group, 8. Eyepiece second group, 9. Eyepiece third group. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] A compact wide-field white light sight optical system of the present embodiment adopts a Kepler telescope system, including an objective lens group, an image transfer group, a graticule and an eyepiece group. The measured target generates an inverted image through the objective lens group, and is imaged on the graticule after passing through the image transfer group. The inverted image formed by the objective lens is erected, and finally reaches the human eye through the eyepiece group. The interval between the objective lens group and the image transfer group is 48.3 mm, the interval between the image transfer group and the graticule is 24.84 mm, and the interval between the graticule and the eyepiece group is 7.9 mm.

[0025] like Figure 1 As shown, the objective lens group adopts 2 groups of 3 spherical lenses, including a first objective lens group 1 and a second objective lens group 2; the image relay group adopts 3 groups of 5 spherical lenses, and the image relay group is placed behind the image plane of the objective lens group, plays a positive image role, and includes a first image relay lens group 3, a second image relay lens group 4 and a third image relay lens group 5; a graticule 6 is placed behind the image relay group, and the graticule 6 is located on the image plane; the eyepiece group adopts 3 groups of 5 spherical lenses, including a first eyepiece lens group 7, a second eyepiece lens group 8 and a third eyepiece lens group 9; wherein the front surface of the first objective lens group 1 and the rear surface of the third eyepiece lens group 9 are coated with an anti-salt spray film.

[0026] In this embodiment, in the optical system of the sight, the light of the measured target passes through the objective lens group, the image transfer group, the graticule and the eyepiece in sequence, and finally enters the human eye. The addition of aspheric surfaces and lanthanide materials with high refractive index in the optical system makes the overall structure compact and the size short. The optical parameters of the sight are: magnification not less than 5.1 times, field of view not less than 8.1°, entrance pupil diameter not less than φ26mm, exit pupil distance not less than 36mm, and total optical length not more than 137mm.

[0027] In this embodiment, the first lens group 1 of the objective lens is a cemented lens, with curvature radii of 54.38, -26.06 and -133.05, respectively, positive and negative optical powers, center thicknesses of 7.6 mm and 2 mm, respectively, and materials of crown glass and flint glass. The second lens group 2 of the objective lens has curvature radii of 26.239 and 62.74, positive optical power, center thickness of 5 mm, and material of lanthanide crown glass.

[0028] In this embodiment, the interval between the first lens group 1 of the objective lens and the second lens group 2 of the objective lens is 0.4 mm. The focal length of the objective lens group is 42.1 mm, and the field of view is not less than 8.1°.

[0029] In this embodiment, the first image-transmitting lens group 3 has a curvature radius of -19.31 and -12.078, a positive focal power, a center thickness of 2.8 mm, and is made of lanthanide crown glass. The second image-transmitting lens group 4 is a cemented lens, with a curvature radius of 40.05, -7.87, and -20.51, a positive and negative focal power, a center thickness of 4 mm and 1.2 mm, and is made of lanthanide crown glass and flint glass. The third image-transmitting lens group 5 is a cemented lens, with a curvature radius of 9.1, 28.65, and 7.87, a positive and negative focal power, a center thickness of 4.6 mm and 2.7 mm, and is made of crown glass.

[0030] In this embodiment, the magnification of the image relay group is -2.36, which not only magnifies the image of the objective lens group by 2.36 times, but also erects the inverted image shrunk by the objective lens group; the intervals between the optical elements in the image relay group are 0.3 mm and 0.29 mm respectively.

[0031] In this embodiment, the scale of the reticle 6 is composed of a rough distance measurement scale with a base line of 2.3 meters of vehicle height, a rough distance measurement scale with a base line of 1.7 meters of human height, a shooting distance scale, a measurement and aiming scale, and a fine scale. When the reticle is used, the target is first measured with the rough distance measurement scale, and then the target is aimed at with the aiming scale of the corresponding distance according to the target distance to shoot. The fine scale can be used for azimuth correction, and can also determine the correction shooting lead time for moving targets and wind speed.

[0032] In this embodiment, the curvature radius of the first lens group 7 of the eyepiece is -21.95 and -14.74 respectively, the optical power is positive, the center thickness is 4.3mm, and the material is lanthanide crown glass. The second lens group 8 of the eyepiece is a cemented lens, the curvature radius is -96.38, 19.51 and -24.6 respectively, the optical power is negative and positive respectively, the center thickness is 2mm and 9.7mm respectively, and the materials are flint glass and crown glass respectively. The front surface of the third lens group 9 of the eyepiece is spherical with a curvature radius of 23.23, and the rear surface is aspherical. The aspherical parameters are: R=-1541.7, k=0, A=1.4899247E-005, B=3.4635233E-009, C=5.3520921E-014, D=-3.287265E-012, the optical power is positive, the center thickness is 6.5mm, and the material is quartz glass.

[0033] In this embodiment, the focal length of the eyepiece group is 19.5mm, the magnification is not less than 12.8 times, the exit pupil diameter is not less than φ5.1mm, the exit pupil distance is not less than 36mm, and the diopter is adjustable; the intervals between the optical elements in the eyepiece group are 0.3mm and 0.3mm respectively.

[0034] The optical system of this white light sight has good imaging quality, no sensitive size, and good lens processing technology. Figure 2, Figure 3 , Figure 4 They represent the system point diagram, spherical aberration curve and relative illumination curve respectively. The optical components are reasonably arranged, compact in structure, small in size, highly feasible in engineering, and have practical application value. The front surface of the first lens group 1 of the objective lens and the rear surface of the third lens group 9 of the eyepiece are coated with anti-salt spray film, the substrates of which are K9 and quartz materials respectively, which greatly improves the salt spray and corrosion resistance of the sight and enhances the environmental adaptability of the sight. The materials of the optical components of the objective lens group, image transfer group, reticle and eyepiece group are all commonly used materials, which are relatively economical and conducive to mass production.

[0035] The above description is only a description of the preferred implementation mode of the present invention, and does not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by engineers and technicians in this field should fall within the protection scope of the present invention.

Claims

1. A compact wide-field white light sight optical system, adopting a Keplerian telescope system, comprising an objective lens group, an image transfer group, a graticule and an eyepiece group; the objective lens group adopts two groups of three spherical lenses, including an objective lens first lens group (1) and an objective lens second lens group (2); the image transfer group adopts three groups of five spherical lenses, the image transfer group is arranged behind the image plane of the objective lens group, plays an erect image role, and comprises an image transfer first lens group (3), an image transfer second lens group (4) and an image transfer third lens group (5); the graticule (6) is arranged behind the image transfer group, and the graticule (6) has a line surface located on the image plane; the eyepiece group adopts three groups of five spherical lenses, including an eyepiece first lens group (7), an eyepiece second lens group (8) and an eyepiece third lens group (9); wherein the front surface of the objective lens first lens group (1) is coated with an anti-salt spray film, the substrate of which is a K9 material, and the rear surface of the eyepiece third lens group (9) is coated with an anti-salt spray film, the substrate of which is a quartz material; The optical parameters of the sight optical system are as follows: the magnification is not less than 5.1 times, the field of view is not less than 8.1°, the entrance pupil diameter is not less than φ26mm, the exit pupil distance is not less than 36mm, and the total optical length is not greater than 137mm; the focal length of the objective lens group is 42.1mm, and the field of view is not less than 8.1°; the magnification of the image transfer group is -2.36, which not only magnifies the image of the objective lens group by 2.36 times, but also erects the inverted image formed by the objective lens group; the intervals between the optical elements in the image transfer group are 0.3mm and 0.29mm respectively; the focal length of the eyepiece group is 19.5mm, the magnification is not less than 12.8 times, the exit pupil diameter is not less than φ5.1mm, the exit pupil distance is not less than 36mm, and the diopter is adjustable; the intervals between the optical elements in the eyepiece group are 0.3mm and 0.3mm respectively.

2. The compact wide-field white light sight optical system according to claim 1, characterized in that: The first lens group (1) of the objective lens is a cemented lens, with curvature radii of 54.38 mm, -26.06 mm and -133.05 mm, respectively, positive and negative optical powers, respectively, center thicknesses of 7.6 mm and 2 mm, respectively, and made of crown glass and flint glass, respectively; the second lens group (2) of the objective lens has curvature radii of 26.239 mm and 62.74 mm, respectively, positive optical power, center thicknesses of 5 mm, and made of lanthanide crown glass; the interval between the first lens group (1) of the objective lens and the second lens group (2) of the objective lens is 0.4 mm.

3. The compact wide-field white light sight optical system according to claim 1 or 2, characterized in that: The first image-transmitting lens group (3) has a curvature radius of -19.31 mm and -12.078 mm, respectively, a positive optical power, a center thickness of 2.8 mm, and is made of lanthanide crown glass; the second image-transmitting lens group (4) is a cemented lens, has a curvature radius of 40.05 mm, -7.87 mm, and -20.51 mm, respectively, a positive optical power and a negative optical power, respectively, a center thickness of 4 mm and 1.2 mm, respectively, and is made of lanthanide crown glass and flint glass, respectively; the third image-transmitting lens group (5) is a cemented lens, has a curvature radius of 9.1 mm, 28.65 mm, and 7.87 mm, respectively, a positive optical power and a negative optical power, respectively, a center thickness of 4.6 mm and 2.7 mm, respectively, and is made of crown glass.

4. The compact wide-field white light sight optical system according to claim 3, characterized in that: The engraved lines of the reticle (6) are composed of a rough distance measurement scale with a base line of 2.3 meters of vehicle height, a rough distance measurement scale with a base line of 1.7 meters of human height, a shooting distance scale, a combined measurement and aiming scale, and a fine-position scale.

5. The compact wide-field white light sight optical system according to claim 4, characterized in that: The first lens group (7) of the eyepiece has a curvature radius of -21.95 mm and -14.74 mm, respectively, a positive focal power, a center thickness of 4.3 mm, and is made of lanthanide crown glass; the second lens group (8) of the eyepiece is a cemented lens, with a curvature radius of -96.38 mm, 19.51 mm and -24.6 mm, respectively, a negative focal power and a positive focal power, respectively, a center thickness of 2 mm and 9.7 mm, respectively, and is made of flint glass and crown glass, respectively; the front surface of the third lens group (9) of the eyepiece is a spherical surface, with a curvature radius of 23.23 mm. mm, the back surface is aspherical, the aspherical parameters are: R=-1541.7, k=0, A=1.4899247E-005, B=3.4635233E-009, C=5.3520921E-014, D=-3.287265E-012, the optical power is positive, the center thickness is 6.5mm, and the material is quartz glass.

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