Novel optical system of large-caliber front low-light sighting telescope

Abstract

The invention provides an optical system of a novel large-aperture front low-light sighting telescope. The optical system comprises an objective optical system and an eyepiece optical system. The objective optical system comprises a first objective lens, a double-glue objective lens, a fourth objective lens, a fifth objective lens and a sixth objective lens which are sequentially arranged from the object space to the image space; the eyepiece optical system comprises a first eyepiece lens, a second eyepiece lens, a double-glue eyepiece, a fifth eyepiece lens and a sixth eyepiece lens which are sequentially arranged from the human eye to the focal plane of the eyepiece. The optical system is simple in structure and short in total length, and lightweight design of the low-light sighting telescope is facilitated.

Description

Technical Field

[0001] The invention relates to the field of sights, and in particular to an optical system of a novel large-caliber front low-light sight. Background Art

[0002] Since the human eye cannot directly observe low light and infrared light signals, it is necessary to convert the target signal to be observed into a visible light image. Low light sights are mainly used for medium and long-range night observation sights. Under the condition of no artificial lighting at night, with the help of weak starlight or moonlight, you can aim and shoot at the target, and you can also detect and search for targets at night.

[0003] Since there is a great demand for night sighting in the market, but the corresponding gun sighting caliber is not large, and since the image formed by the image intensifier is an inverted image, the eyepiece of the low-light-level sight on the market must have an image transfer structure, which leads to a long and complex system structure. For example, the prior art discloses a low-light-level sight objective optical system, which has a focal length of 85mm, but the total length of the optical system reaches 143mm, resulting in a large volume of the sight, which is not easy to assemble and carry. Summary of the invention

[0004] The purpose of the present invention is to provide a novel optical system of a large-caliber front low-light-level sight, so as to reduce the total length of the optical system of the low-light-level sight and contribute to the lightweight of the low-light-level sight.

[0005] In order to solve the above technical problems, the present invention provides a novel optical system of a large-aperture front-mounted low-light level sight, comprising an objective optical system and an eyepiece optical system; the objective optical system comprises an objective first lens, a double-gel objective lens, an objective fourth lens, an objective fifth lens, and an objective sixth lens, which are arranged in sequence from the object side to the image side; the eyepiece optical system comprises an eyepiece first lens, an eyepiece second lens, a double-gel eyepiece, an eyepiece fifth lens, and an eyepiece sixth lens, which are arranged in sequence from the human eye to the eyepiece focal plane. According to the above scheme, the first lens of the objective lens is a plano-convex lens, the double-glued objective lens is formed by gluing the second lens and the third lens of the objective lens, the second lens of the objective lens is a biconvex lens, the third lens of the objective lens is a biconcave lens, the fourth lens of the objective lens is a biconcave lens, the fifth lens of the objective lens is a biconvex lens, and the sixth lens of the objective lens is a biconvex lens.

[0006] According to the above scheme, the first lens of the eyepiece is a meniscus lens, the second lens of the eyepiece is a meniscus lens, the double-gel eyepiece is formed by gluing the third lens of the eyepiece and the fourth lens of the eyepiece, the third lens of the eyepiece is a meniscus lens, the fourth lens of the eyepiece is a meniscus lens, the fifth lens of the eyepiece is a meniscus lens, and the sixth lens of the eyepiece is a double convex lens.

[0007] According to the above scheme, the material of the first lens of the objective lens is lanthanum crown glass, the material of the second lens of the objective lens is fluorine crown glass, the material of the third lens of the objective lens is heavy flint glass, the material of the fourth lens of the objective lens is heavy flint glass, the material of the fifth lens of the objective lens is heavy lanthanum flint glass, and the material of the sixth lens of the objective lens is lanthanum crown glass.

[0008] According to the above scheme, the material of the first lens of the eyepiece is lanthanum crown glass, the material of the second lens of the eyepiece is lanthanum crown glass, the material of the third lens of the eyepiece is heavy flint glass, the material of the fourth lens of the eyepiece is light crown glass, the material of the fifth lens of the eyepiece is heavy lanthanum flint glass, and the material of the sixth lens of the eyepiece is heavy flint glass.

[0009] According to the above scheme, the radius of curvature of the side of the first lens of the objective lens away from the second lens of the objective lens is [70mm, 80mm], and the radius of curvature of the side of the first lens of the objective lens close to the second lens of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the second lens of the objective lens away from the third lens of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the second lens of the objective lens close to the third lens of the objective lens is [-960mm, -950mm]; The radius of curvature of the side of the third lens of the objective lens away from the second lens of the objective lens is [100 mm, 110 mm]; The radius of curvature of the side of the fourth lens of the objective lens far away from the fifth lens of the objective lens is [-310mm, -300mm], and the radius of curvature of the side of the fourth lens of the objective lens close to the fifth lens of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the fifth lens of the objective lens far from the sixth lens of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the fifth lens of the objective lens close to the sixth lens of the objective lens is [-470mm, -460mm]; The radius of curvature of the side of the sixth lens of the objective lens far away from the fifth lens of the objective lens is [80mm, 90mm], and the radius of curvature of the side of the sixth lens of the objective lens close to the fifth lens of the objective lens is [-50mm, -40mm]; When light passes through a certain objective lens surface from the object side to the image plane, if the objective lens surface is convex, the radius of curvature of the objective lens surface is positive, and if the objective lens surface is concave, the radius of curvature of the objective lens surface is negative.

[0010] According to the above scheme, the radius of curvature of the side of the first lens of the eyepiece away from the second lens of the eyepiece is [30mm, 40mm], and the radius of curvature of the side of the first lens of the eyepiece close to the second lens of the eyepiece is [160mm, 170mm]; The curvature radius of the side of the second lens of the eyepiece away from the third lens of the eyepiece is [20mm, 30mm], and the curvature radius of the side of the second lens of the eyepiece close to the third lens of the eyepiece is [30mm, 40mm]; The curvature radius of the side of the third lens of the eyepiece away from the fourth lens of the eyepiece is [160mm, 170mm], and the curvature radius of the side of the third lens of the eyepiece close to the fourth lens of the eyepiece is [10mm, 20mm]; The curvature radius of the side of the fourth lens of the eyepiece away from the fifth lens of the eyepiece is [10mm, 20mm], and the curvature radius of the side of the fourth lens of the eyepiece close to the fifth lens of the eyepiece is [40mm, 50mm]; The curvature radius of the side of the fifth lens of the eyepiece away from the sixth lens of the eyepiece is [-20mm, -10mm], and the curvature radius of the side of the fifth lens of the eyepiece close to the sixth lens of the eyepiece is [-180mm, -170mm]; The radius of curvature of the side of the sixth lens of the eyepiece away from the fifth lens of the eyepiece is [-100mm, -90mm], and the radius of curvature of the side of the sixth lens of the eyepiece close to the fifth lens of the eyepiece is [30mm, 40mm]; When light passes through a certain eyepiece surface from the human eye to the eyepiece focal plane, if the eyepiece surface is convex, the radius of curvature of the eyepiece surface is positive, and if the eyepiece surface is concave, the radius of curvature of the eyepiece surface is negative.

[0011] According to the above scheme, the central thickness of the first lens of the objective lens ranges from [6mm, 10mm], the air gap between the first lens of the objective lens and the second lens of the objective lens ranges from [25mm, 35mm], the central thickness of the second lens of the objective lens ranges from [5mm, 10mm], the central thickness of the third lens of the objective lens ranges from [0mm, 5mm], the air gap between the third lens of the objective lens and the diaphragm ranges from [5mm, 10mm], and the air gap between the diaphragm and the fourth lens of the objective lens ranges from [5mm, 10mm]. The center thickness of the fourth lens of the objective lens ranges from [0mm, 5mm], the air gap between the fourth lens of the objective lens and the fifth lens of the objective lens ranges from [25mm, 35mm], the center thickness of the fifth lens of the objective lens ranges from [0mm, 5mm], the air gap between the fifth lens of the objective lens and the sixth lens of the objective lens ranges from [5mm, 10mm], the center thickness of the sixth lens of the objective lens ranges from [0mm, 5mm], and the air gap between the sixth lens of the objective lens and the focal plane of the objective lens ranges from [10mm, 15mm].

[0012] According to the above scheme, the center thickness of the first lens of the eyepiece is in the range of [10mm, 15mm], the air gap between the first lens of the eyepiece and the second lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the second lens of the eyepiece is in the range of [5mm, 10mm], the air gap between the third lens of the eyepiece and the second lens of the eyepiece is in the range of [5mm, 10mm], the center thickness of the third lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the fourth lens of the eyepiece is in the range of [5mm, 10mm], the air gap between the fourth lens of the eyepiece and the fifth lens of the eyepiece is in the range of [20mm, 25mm], the center thickness of the fifth lens of the eyepiece is in the range of [0mm, 5mm], the air gap between the fifth lens of the eyepiece and the sixth lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the sixth lens of the eyepiece is in the range of [0mm, 5mm], and the air gap between the sixth lens of the eyepiece and the focal plane of the eyepiece is in the range of [10mm, 15mm].

[0013] According to the above scheme, the fifth lens of the objective lens and the sixth lens of the objective lens are combined as a focusing lens for internal focusing.

[0014] Beneficial Effects The eyepiece optical system of the optical system of the low-light-level sight of the present invention adopts an objective lens structure design, so that there is no need to set up an image transfer system in the sight, which reduces the complexity of the optical system and shortens the overall length of the optical system, can effectively reduce the volume of the sight and reduce the weight of the sight, thereby achieving lightweighting of the low-light-level sight. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the structure of an objective optical system according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of an eyepiece optical system according to an embodiment of the present invention; Figure 3 is an MTF curve diagram of an objective lens according to an embodiment of the present invention under the condition of object distance ∞; Figure 4 This is an MTF curve diagram of an objective lens according to an embodiment of the present invention at an object distance of 10m; Figure 5 is a point diagram of an objective lens according to an embodiment of the present invention; Figure 6 is a relative illumination diagram of an objective lens according to an embodiment of the present invention; Figure 7 is a diagram of field curvature and distortion of an objective lens according to an embodiment of the present invention; Figure 8 is an eyepiece spot diagram of an embodiment of the present invention; Fig. 9 is a diagram of field curvature and distortion of an eyepiece according to an embodiment of the present invention; Fig.10 This is a cross-sectional view of the structure of a novel large-caliber front-mounted low-light sight according to an embodiment of the present invention; Fig.11 This is a front view of a novel large-caliber front-mounted low-light sight structure according to an embodiment of the present invention; Fig.12 It is an AA cross-sectional view of a novel large-caliber front low-light sight according to an embodiment of the present invention.

[0016] In the figure: 1-the first lens of the objective lens; 2-the first cemented lens of the objective lens; 201-the second lens of the objective lens; 202-the third lens of the objective lens; 3-the fourth lens of the objective lens; 4-the fifth lens of the objective lens; 5-the sixth lens of the objective lens; 6-the first lens of the eyepiece; 7-the second lens of the eyepiece; 801-the third lens of the eyepiece; 802-the fourth lens of the eyepiece; 9-the fifth lens of the eyepiece; 10-the sixth lens of the eyepiece; 11-the first pressure ring of the objective lens; 12-the gasket of the objective lens; 13-the second pressure ring of the objective lens ;14-objective lens spacer;15-front lens tube;16-focusing lens pressure ring;17-focusing lens spacer;18-focusing lens frame;19-eyepiece first pressure ring;20-eyepiece first spacer;21-first eyepiece frame;22-eyepiece frame;23-eyepiece second spacer;24-eyepiece third spacer;25-eyepiece sealing ring;26-eyepiece second pressure ring;27-focusing hand wheel;28-focusing pressure ring;29-inner distance adjustment wheel;30-focusing screw;31-focusing sealing ring. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0018] See also Figure 1 , Figure 2 This embodiment discloses an optical system of a novel large-aperture front-mounted low-light level sight, including an objective optical system and an eyepiece optical system; the objective optical system includes an objective first lens 1, a double-gel objective lens, an objective fourth lens 3, an objective fourth lens 4, and an objective sixth lens 5, which are arranged in sequence from the object side to the image side; the eyepiece optical system includes an eyepiece first lens 6, an eyepiece second lens 7, a double-gel eyepiece, an eyepiece fifth lens 9, and an eyepiece sixth lens 10, which are arranged in sequence from the human eye to the eyepiece focal plane. Furthermore, the first lens 1 of the objective lens is a plano-convex lens, the double-glued objective lens is formed by gluing the second lens 201 of the objective lens and the third lens 202 of the objective lens, the second lens 201 of the objective lens is a biconvex lens, the third lens 202 of the objective lens is a biconcave lens, the fourth lens 3 of the objective lens is a biconcave lens, the fourth lens 4 of the objective lens is a biconvex lens, and the sixth lens 5 of the objective lens is a biconvex lens.

[0019] Furthermore, the first lens 6 of the eyepiece is a meniscus lens, the second lens 7 of the eyepiece is a meniscus lens, the double-glued eyepiece is formed by gluing the third lens 801 of the eyepiece and the fourth lens 802 of the eyepiece, the third lens 801 of the eyepiece is a meniscus lens, the fourth lens 802 of the eyepiece is a meniscus lens, the fifth lens 9 of the eyepiece is a meniscus lens, and the sixth lens 10 of the eyepiece is a double convex lens.

[0020] Furthermore, the material of the first lens 1 of the objective lens is lanthanum crown glass, the material of the second lens 201 of the objective lens is fluorine crown glass, the material of the third lens 202 of the objective lens is heavy flint glass, the material of the fourth lens 3 of the objective lens is heavy flint glass, the material of the fourth lens 4 of the objective lens is heavy lanthanum flint glass, and the material of the sixth lens 5 of the objective lens is lanthanum crown glass.

[0021] Furthermore, the material of the first lens 6 of the eyepiece is lanthanum crown glass, the material of the second lens 7 of the eyepiece is lanthanum crown glass, the material of the third lens 801 of the eyepiece is heavy flint glass, the material of the fourth lens 802 of the eyepiece is light crown glass, the material of the fifth lens 9 of the eyepiece is heavy lanthanum flint glass, and the material of the sixth lens 10 of the eyepiece is heavy flint glass.

[0022] In this embodiment, the lens glass in the optical system is made of CDGM commonly used glass material with good processability.

[0023] Further, the radius of curvature of the side of the first lens 1 of the objective lens away from the second lens 201 of the objective lens is [70mm, 80mm], and the radius of curvature of the side of the first lens 1 of the objective lens close to the second lens 201 of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the second lens 201 of the objective lens far from the third lens 202 of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the second lens 201 of the objective lens close to the third lens 202 of the objective lens is [-960mm, -950mm]; The radius of curvature of the side of the objective lens third lens 202 away from the objective lens second lens 201 is [100 mm, 110 mm]; The radius of curvature of the side of the fourth lens 3 of the objective lens far from the fourth lens 4 of the objective lens is [-310mm, -300mm], and the radius of curvature of the side of the fourth lens 3 of the objective lens close to the fourth lens 4 of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the fourth lens 4 of the objective lens far from the sixth lens 5 of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the fourth lens 4 of the objective lens close to the sixth lens 5 of the objective lens is [-470mm, -460mm]; The radius of curvature of the side of the sixth lens 5 of the objective lens far away from the fourth lens 4 of the objective lens is [80mm, 90mm], and the radius of curvature of the side of the sixth lens 5 of the objective lens close to the fourth lens 4 of the objective lens is [-50mm, -40mm]; When light passes through a certain objective lens surface from the object side to the image plane, if the objective lens surface is convex, the radius of curvature of the objective lens surface is positive, and if the objective lens surface is concave, the radius of curvature of the objective lens surface is negative.

[0024] Further, the curvature radius of the side of the first lens 6 of the eyepiece away from the second lens 7 of the eyepiece is [30mm, 40mm], and the curvature radius of the side of the first lens 6 of the eyepiece close to the second lens 7 of the eyepiece is [160mm, 170mm]; The curvature radius of the side of the eyepiece second lens 7 away from the eyepiece third lens 801 is [20mm, 30mm], and the curvature radius of the side of the eyepiece second lens 7 close to the eyepiece third lens 801 is [30mm, 40mm]; The curvature radius of the side of the eyepiece third lens 801 away from the eyepiece fourth lens 802 is [160mm, 170mm], and the curvature radius of the side of the eyepiece third lens 801 close to the eyepiece fourth lens 802 is [10mm, 20mm]; The curvature radius of the side of the eyepiece fourth lens 802 away from the eyepiece fifth lens 9 is [10mm, 20mm], and the curvature radius of the side of the eyepiece fourth lens 802 close to the eyepiece fifth lens 9 is [40mm, 50mm]; The curvature radius of the side of the eyepiece fifth lens 9 away from the eyepiece sixth lens 10 is [-20mm, -10mm], and the curvature radius of the side of the eyepiece fifth lens 9 close to the eyepiece sixth lens 10 is [-180mm, -170mm]; The radius of curvature of the side of the sixth lens 10 of the eyepiece away from the fifth lens 9 of the eyepiece is [-100mm, -90mm], and the radius of curvature of the side of the sixth lens 10 of the eyepiece close to the fifth lens 9 of the eyepiece is [30mm, 40mm]; When light passes through a certain eyepiece surface from the human eye to the eyepiece focal plane, if the eyepiece surface is convex, the radius of curvature of the eyepiece surface is positive, and if the eyepiece surface is concave, the radius of curvature of the eyepiece surface is negative.

[0025] Further, the central thickness of the first lens 1 of the objective lens is in the range of [6mm, 10mm], the air gap between the first lens 1 of the objective lens and the second lens 201 of the objective lens is in the range of [25mm, 35mm], the central thickness of the second lens 201 of the objective lens is in the range of [5mm, 10mm], the central thickness of the third lens 202 of the objective lens is in the range of [0mm, 5mm], the air gap between the third lens 202 of the objective lens and the aperture is in the range of [5mm, 10mm], and the air gap between the aperture and the fourth lens 3 of the objective lens is in the range of [5mm, 10mm m], the center thickness of the fourth lens 3 of the objective lens ranges from [0mm, 5mm], the air gap between the fourth lens 3 and the fourth lens 4 of the objective lens ranges from [25mm, 35mm], the center thickness of the fourth lens 4 of the objective lens ranges from [0mm, 5mm], the air gap between the fourth lens 4 and the sixth lens 5 of the objective lens ranges from [5mm, 10mm], the center thickness of the sixth lens 5 of the objective lens ranges from [0mm, 5mm], and the air gap between the sixth lens 5 and the focal plane of the objective lens ranges from [10mm, 15mm].

[0026] Furthermore, the center thickness of the first lens 6 of the eyepiece is in the range of [10mm, 15mm], the air gap between the first lens 6 of the eyepiece and the second lens 7 of the eyepiece is in the range of [0mm, 5mm], the center thickness of the second lens 7 of the eyepiece is in the range of [5mm, 10mm], the air gap between the third lens 801 of the eyepiece and the second lens 7 of the eyepiece is in the range of [5mm, 10mm], the center thickness of the third lens 801 of the eyepiece is in the range of [0mm, 5mm], and the center thickness of the fourth lens 802 of the eyepiece is in the range of The range of air spacing between the eyepiece fourth lens 802 and the eyepiece fifth lens 9 is [5mm, 10mm], the range of air spacing between the eyepiece fifth lens 802 and the eyepiece fifth lens 9 is [20mm, 25mm], the range of center thickness of the eyepiece fifth lens 9 is [0mm, 5mm], the range of air spacing between the eyepiece fifth lens 9 and the eyepiece sixth lens 10 is [0mm, 5mm], the range of center thickness of the eyepiece sixth lens 10 is [0mm, 5mm], and the range of air spacing between the eyepiece sixth lens 10 and the eyepiece focal plane is [10mm, 15mm].

[0027] In this embodiment, the size and thickness / spacing parameters of each lens in the optical system are shown in the following table:

[0028] The optical characteristic parameter diagram of the above optical system can be found in Figure 3~Figure 9 .

[0029] The focal length of the objective optical system is 108 mm, the working F number is 1.57, the total length of the system is 129 mm, and the total glass mass is 202.45 g.

[0030] In this embodiment, the objective optical system adopts an improved Petzval structure, the image plane position of the objective optical system coincides with the image input plane of the image intensifier, and the design of the objective optical system is based on the resolution of the image intensifier to obtain the system MTF ≥ 0.34@64lp / mm. Compared with the objective optical system of the prior art, the image quality is greatly improved, and the total length of the system is shortened, providing strong support for subsequent mass production and lightweight. The focal length of the eyepiece optical system is 108mm, the exit pupil diameter is 51mm, the total length of the system is 77mm, and the total weight of the glass is 123g.

[0031] The fourth lens 3 of the objective lens of the objective lens optical system of the present embodiment adopts high refractive index glass, and adopts a symmetrical structure design with a radius of curvature, which greatly simplifies the difficulty of glass processing and the complexity of structural tolerance, effectively corrects spherical aberration, chromatic aberration, etc., and the structure can also make the light refraction angle gentle, which is used to reduce the aberration caused by the sudden change of light in the system. The fifth and sixth lenses of the objective lens are combined into a focusing lens group. If the overall focusing method is adopted, there is an eccentric angle between the actual optical axis and the theoretical optical axis due to the matching gap between the lens barrel and the objective lens group during the focusing process, and the eccentric angle will affect all optical parts. Therefore, the objective lens optical system adopts a "positive + negative" lens group internal focusing method. When the combined lens moves axially along the optical axis, the combined focal length of the system will not change, and the eccentric angle produced by focusing only affects the focusing group, which can achieve better optical axis stability, smooth focusing feel, easy operation, and reduce the weight of the focusing group, and can also achieve better sealing performance, which is conducive to achieving product lightweight. By adjusting the relative position of the combined lens in the objective system, 10m~∞ adjustment can be achieved, the focusing distance is 2.295mm, and the image quality is clear and stable during the focusing process.

[0032] See also Figure 3 , the objective optical system is under the condition of object distance ∞, MTF ≥ 0.34@64lp / mm; see Figure 6 The relative illumination of the objective optical system in the whole field of view is greater than 90%, and the vignetting of the edge field of view of the objective is less than 8%, which ensures the light transmittance of the edge field of view, and the maximum distortion of the whole field of view of the objective does not exceed 0.6%.

[0033] The optical system of the novel large-caliber front-mounted low-light sight of this embodiment has the following beneficial effects: 1. The viewing distance range of the objective lens is 10m~∞, and the MTF transfer function curve of the objective lens at 10m and ∞ is as follows Figure 3 , Figure 4 As shown, the image quality is clear within the entire viewing distance range. The internal focusing method is adopted, which not only has a compact structure, impact resistance, stable and clear image quality, and smooth focusing feel, but also achieves better sealing performance.

[0034] 2. The entire optical system has a simple structure, and all uses CDGM common materials and highly machinable surfaces, achieving lightweight and mass production of the optical system.

[0035] 3. The root mean square radius of all fields of view of the eyepiece optical system of the embodiment of the present invention is within 40 μm, the GEO radius does not exceed 90 μm, and the imaging light energy is concentrated; 4. The distortion correction effect of the eyepiece optical system of the embodiment of the present invention is remarkable, with the maximum distortion not exceeding 0.6%. The image quality is clear in the entire field of view, ensuring the integrity and stability of the image, and ensuring that the observer can obtain a consistent and reliable observation experience over a long period of time.

[0036] See also Figure 10~Figure 12 The present embodiment also provides a novel large-aperture front-mounted low-light level sight, in which the optical system described above is arranged, and the low-light level sight comprises a front lens group, a lens body group, a rear lens group, and a bracket group; wherein the front lens group comprises a fixed objective lens front group and a movable focusing lens group; an image intensifier is arranged in the lens body group, and the front lens group and the rear lens group are respectively fixedly connected to the two ends of the image intensifier; a focusing assembly connected to the focusing lens group and enabling the focusing lens group to move along the optical axis direction of the sight is arranged on the outside of the lens body (the movable part of the focusing lens group is moved along the optical axis direction in the lens body by rotating the focusing hand wheel 27, and the structure of the focusing assembly is a prior art, and there are a variety of existing structural forms that can achieve the adjustment effect, which will not be repeated in this embodiment).

[0037] Further, the objective lens front group includes an objective lens first pressing ring 11, an objective lens gasket 12, an objective lens second pressing ring 13, and an objective lens spacer 14 for fixing the objective lens optical system and controlling the lens spacing between the objective lens optical systems; The focusing lens group includes a focusing lens pressing ring 16, a focusing lens spacer 17, and a focusing lens frame 18 for fixing the objective lens optical system and controlling the lens interval between the objective lens optical systems; The rear lens assembly includes an eyepiece first pressing ring 19, an eyepiece first spacer 20, a first eyepiece frame 21, an eyepiece frame 22, an eyepiece second spacer 23, an eyepiece third spacer 24, an eyepiece sealing ring 25, and an eyepiece second pressing ring 26 for fixing the eyepiece optical system and controlling the lens spacing between the eyepiece optical systems; The focusing assembly includes a focusing hand wheel 27, a focusing pressure ring 28, an inner distance adjustment wheel 29, a focusing screw 30, and a focusing sealing ring 31; Furthermore, a decorative ring (6063 material) is provided between the front lens group and the lens body group, and an eyepiece gasket (6063 material) is provided in the eyepiece group in the rear lens group; both the decorative ring and the eyepiece gasket are made of aluminum material that is easy to surface treat to reduce wear during use and avoid a reduction in the accuracy of the low-light scope. Furthermore, an image tube pressure ring and a light guide plate are provided in the scope body for limiting the image intensifier group in the direction of the optical axis of the scope.

[0038] Furthermore, the entire sight is fixed with screws to ensure the consistency of the optical axis.

[0039] Furthermore, a matte pattern is provided on the objective lens spacer 14 close to the first objective lens 1 on the inner side, so as to reduce light reflection and improve the imaging quality.

[0040] It should be understood that the above structure is only an example of the structural component composition of the optical system in this embodiment and should not be used as a limitation on the application of the optical system. Those skilled in the art can design and adjust the structural component according to actual needs.

[0041] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel optical system of a large-caliber front-mounted low-light sight, characterized in that: It includes an objective optical system and an eyepiece optical system; The objective optical system includes an objective first lens, a double-gel objective lens, an objective fourth lens, an objective fifth lens, and an objective sixth lens, which are arranged in sequence from the object side to the image side; the eyepiece optical system includes an eyepiece first lens, an eyepiece second lens, a double-gel eyepiece, an eyepiece fifth lens, and an eyepiece sixth lens, which are arranged in sequence from the human eye to the eyepiece focal plane.

2. The optical system of the novel large-aperture front-mounted low-light sight according to claim 1 is characterized in that: The first lens of the objective lens is a plano-convex lens, the double-gel objective lens is formed by gluing the second lens and the third lens of the objective lens, the second lens of the objective lens is a biconvex lens, the third lens of the objective lens is a biconcave lens, the fourth lens of the objective lens is a biconcave lens, the fifth lens of the objective lens is a biconvex lens, and the sixth lens of the objective lens is a biconvex lens.

3. The optical system of the novel large-aperture front-mounted low-light sight according to claim 1 is characterized in that: The first lens of the eyepiece is a meniscus lens, the second lens of the eyepiece is a meniscus lens, the double-gel eyepiece is formed by gluing the third lens of the eyepiece and the fourth lens of the eyepiece, the third lens of the eyepiece is a meniscus lens, the fourth lens of the eyepiece is a meniscus lens, the fifth lens of the eyepiece is a meniscus lens, and the sixth lens of the eyepiece is a double convex lens.

4. The optical system of the novel large-aperture front-mounted low-light sight according to claim 2 is characterized in that: The material of the first lens of the objective lens is lanthanum crown glass, the material of the second lens of the objective lens is fluor crown glass, the material of the third lens of the objective lens is heavy flint glass, the material of the fourth lens of the objective lens is heavy flint glass, the material of the fifth lens of the objective lens is heavy lanthanum flint glass, and the material of the sixth lens of the objective lens is lanthanum crown glass.

5. The optical system of the novel large-aperture front-mounted low-light sight according to claim 3 is characterized in that: The material of the first lens of the eyepiece is lanthanum crown glass, the material of the second lens of the eyepiece is lanthanum crown glass, the material of the third lens of the eyepiece is heavy flint glass, the material of the fourth lens of the eyepiece is light crown glass, the material of the fifth lens of the eyepiece is heavy lanthanum flint glass, and the material of the sixth lens of the eyepiece is heavy flint glass.

6. The optical system of the novel large-aperture front-mounted low-light sight according to claim 2 is characterized in that: The radius of curvature of the side of the first lens of the objective lens away from the second lens of the objective lens is [70mm, 80mm], and the radius of curvature of the side of the first lens of the objective lens close to the second lens of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the second lens of the objective lens away from the third lens of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the second lens of the objective lens close to the third lens of the objective lens is [-960mm, -950mm]; The radius of curvature of the side of the third lens of the objective lens away from the second lens of the objective lens is [100 mm, 110 mm]; The radius of curvature of the side of the fourth lens of the objective lens far away from the fifth lens of the objective lens is [-310mm, -300mm], and the radius of curvature of the side of the fourth lens of the objective lens close to the fifth lens of the objective lens is [300mm, 310mm]; The radius of curvature of the side of the fifth lens of the objective lens far from the sixth lens of the objective lens is [40mm, 50mm], and the radius of curvature of the side of the fifth lens of the objective lens close to the sixth lens of the objective lens is [-470mm, -460mm]; The radius of curvature of the side of the sixth lens of the objective lens far away from the fifth lens of the objective lens is [80mm, 90mm], and the radius of curvature of the side of the sixth lens of the objective lens close to the fifth lens of the objective lens is [-50mm, -40mm]; When light passes through a certain objective lens surface from the object side to the image plane, if the objective lens surface is convex, the radius of curvature of the objective lens surface is positive, and if the objective lens surface is concave, the radius of curvature of the objective lens surface is negative.

7. The optical system of the novel large-aperture front-mounted low-light sight according to claim 3 is characterized in that: The curvature radius of the side of the first lens of the eyepiece away from the second lens of the eyepiece is [30mm, 40mm], and the curvature radius of the side of the first lens of the eyepiece close to the second lens of the eyepiece is [160mm, 170mm]; The curvature radius of the side of the second lens of the eyepiece away from the third lens of the eyepiece is [20mm, 30mm], and the curvature radius of the side of the second lens of the eyepiece close to the third lens of the eyepiece is [30mm, 40mm]; The curvature radius of the side of the third lens of the eyepiece away from the fourth lens of the eyepiece is [160mm, 170mm], and the curvature radius of the side of the third lens of the eyepiece close to the fourth lens of the eyepiece is [10mm, 20mm]; The curvature radius of the side of the fourth lens of the eyepiece away from the fifth lens of the eyepiece is [10mm, 20mm], and the curvature radius of the side of the fourth lens of the eyepiece close to the fifth lens of the eyepiece is [40mm, 50mm]; The curvature radius of the side of the fifth lens of the eyepiece away from the sixth lens of the eyepiece is [-20mm, -10mm], and the curvature radius of the side of the fifth lens of the eyepiece close to the sixth lens of the eyepiece is [-180mm, -170mm]; The radius of curvature of the side of the sixth lens of the eyepiece away from the fifth lens of the eyepiece is [-100mm, -90mm], and the radius of curvature of the side of the sixth lens of the eyepiece close to the fifth lens of the eyepiece is [30mm, 40mm]; When light passes through a certain eyepiece surface from the human eye to the eyepiece focal plane, if the eyepiece surface is convex, the radius of curvature of the eyepiece surface is positive, and if the eyepiece surface is concave, the radius of curvature of the eyepiece surface is negative.

8. The optical system of the novel large-aperture front-mounted low-light sight according to claim 2 is characterized in that: The center thickness of the first lens of the objective lens is in the range of [6mm, 10mm], the air gap between the first lens of the objective lens and the second lens of the objective lens is in the range of [25mm, 35mm], the center thickness of the second lens of the objective lens is in the range of [5mm, 10mm], the center thickness of the third lens of the objective lens is in the range of [0mm, 5mm], the air gap between the third lens of the objective lens and the aperture is in the range of [5mm, 10mm], the air gap between the aperture and the fourth lens of the objective lens is in the range of [5mm, 10mm], the center thickness of the third lens of the objective lens is in the range of [0mm, 5mm], the center thickness of the third lens of the objective lens is in the range of [0mm, 5mm], the center thickness of the third lens of the objective lens and the aperture is in the range of [5mm, 10mm], the center thickness of the third lens of the objective lens ...0mm, 5mm], the center thickness of the third lens of the objective lens and the aperture is in the range of [5mm, 10mm], the center thickness of the third lens of the objective lens is in the range of [0mm, 5mm], the center thickness of the third lens of the objective lens and the aperture is in the range of [5mm, The center thickness of the four lenses ranges from [0mm, 5mm], the air gap between the fourth lens and the fifth lens of the objective lens ranges from [25mm, 35mm], the center thickness of the fifth lens of the objective lens ranges from [0mm, 5mm], the air gap between the fifth lens and the sixth lens of the objective lens ranges from [5mm, 10mm], the center thickness of the sixth lens of the objective lens ranges from [0mm, 5mm], and the air gap between the sixth lens of the objective lens and the focal plane of the objective lens ranges from [10mm, 15mm].

9. The optical system of the novel large-aperture front-mounted low-light sight according to claim 3 is characterized in that: The center thickness of the first lens of the eyepiece is in the range of [10mm, 15mm], the air gap between the first lens of the eyepiece and the second lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the second lens of the eyepiece is in the range of [5mm, 10mm], the air gap between the third lens of the eyepiece and the second lens of the eyepiece is in the range of [5mm, 10mm], the center thickness of the third lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the fourth lens of the eyepiece is in the range of [5mm, 10mm], the air gap between the fourth lens of the eyepiece and the fifth lens of the eyepiece is in the range of [20mm, 25mm], the center thickness of the fifth lens of the eyepiece is in the range of [0mm, 5mm], the air gap between the fifth lens of the eyepiece and the sixth lens of the eyepiece is in the range of [0mm, 5mm], the center thickness of the sixth lens of the eyepiece is in the range of [0mm, 5mm], and the air gap between the sixth lens of the eyepiece and the focal plane of the eyepiece is in the range of [10mm, 15mm].

10. The optical system of the novel large-aperture front-mounted low-light sight according to claim 2 is characterized in that: The fifth lens of the objective lens and the sixth lens of the objective lens are combined to serve as a focusing lens for internal focusing.

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