Fusion red dot aiming system

Abstract

This invention discloses a fused red dot sighting system, comprising an infrared mirror group, a liquid crystal display screen, a prism, a first lens group, a reflector, a second lens group, a beam splitter, and an eye point arranged sequentially along the optical path. The prism has an inclined surface facing the first lens group, and a red dot light source is arranged above the inclined surface. This allows the light from the red dot light source and the infrared light from the infrared mirror group to be fused on the prism before being transmitted to the beam splitter and entering the human eye. The infrared mirror group captures an image of the external target, which is then displayed on the liquid crystal display screen. The image on the liquid crystal display screen and the light emitted by the red dot light source are fused on the prism. The fused light passes through the first lens group to complete the first imaging, then passes through the reflector to effectively shorten the volume, and finally passes through the second lens group to reach the beam splitter. At this point, the fused optical path of the infrared light and the red dot light is deflected on the beam splitter and enters the eye point to achieve a second imaging.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to a fused red dot sight system. Background Technology

[0002] Currently, existing red dot sight systems on the market can be broadly categorized into two types: one uses a red dot made of LEDs to directly illuminate a curved beam splitter. The beam splitter reflects the red dot as parallel light into the eye, while the external target also passes directly through the beam splitter into the eye, resulting in the fusion of the external image and the red dot on the retina; the other type places the red dot in a deflecting optical path, using a flat beam splitter for fusion, which does not alter the optical path of the external target, thus reducing parallax. In existing red dot sight systems, the light entering the eye may not be parallel, affecting visual reception, easily causing parallax, reducing aiming accuracy, and most systems fuse visible light with the red dot, making them unusable at night or in low-light conditions. Summary of the Invention

[0003] The main objective of this invention is to propose a fusion red dot aiming system that integrates visible light, infrared, and red dot optical paths to maximize the advantages of each, enabling uninterrupted use day and night, improving aiming accuracy, and reducing the impact on the human eye.

[0004] To achieve the above objectives, the present invention proposes a fused red dot aiming system, comprising an infrared mirror group, a liquid crystal display screen, a prism, a first lens group, a reflector, a second lens group, a beam splitter, and an eye point arranged sequentially along the optical path. The prism has an inclined surface facing the first lens group, and a red dot light source is disposed above the inclined surface, so that the light from the red dot light source and the infrared light from the infrared mirror group are optically fused on the prism and then transmitted to the beam splitter to enter the human eye.

[0005] The external target penetrates the beam splitter and enters the human eye.

[0006] Optionally, in the fused red dot sight system, the distance from the vertex of the surface of the second lens group along the optical axis through the beam splitter to the eye point is the exit pupil distance, which is 87mm.

[0007] Optionally, the prism is disposed opposite to the reflector, the reflector is tilted toward the first mirror group, and the beam splitter is disposed directly opposite the reflector.

[0008] Optionally, the tilt angles of the prism, the reflector, and the beam splitter are all 45°.

[0009] Optionally, the infrared mirror group includes a first lens, a second lens, and an infrared CMOS sensor arranged sequentially along the optical path. The infrared CMOS sensor converts the light received by the first lens and the second lens into an image on the liquid crystal display screen through photoelectric conversion.

[0010] Optionally, the first lens group includes a third lens, a fourth lens, and a fifth lens, wherein the third lens and the fourth lens are meniscus lenses convex away from each other, and the fifth lens is a biconvex lens.

[0011] Optionally, the lens parameters of the third lens and the fourth lens satisfy 1.9 < Nd < 2.05 and 15 < Vd < 35;

[0012] The lens parameters of the fifth lens satisfy 1.75 < Nd < 1.9 and 30 < Vd < 50.

[0013] Optionally, the second lens group includes a sixth lens, a seventh lens, and an eighth lens, wherein the sixth lens is a meniscus lens, and the seventh lens and the eighth lens are combined to form a cemented joint.

[0014] Optionally, the lens parameters of the sixth lens satisfy 1.7 < Nd < 1.85 and 30 < Vd < 55.

[0015] Optionally, the seventh lens is made of ZF material, and the lens parameters satisfy 1.8 < Nd < 1.95, 15 < Vd < 30;

[0016] The eighth lens is made of LAK material, and the lens parameters satisfy 1.65 < Nd < 1.75, 50 < Vd < 60.

[0017] In the technical solution of this invention, the infrared lens group captures an image of the external target, which is then displayed on a liquid crystal display screen. The image on the liquid crystal display screen and the light emitted by the red dot light source are fused together on a prism, thus achieving the fusion of infrared and red dot light. The fused light then passes through the first lens group to complete the first imaging. After passing through a reflector to effectively shorten the volume, it passes through the second lens group and reaches the beam splitter. At this point, the fused optical path of the infrared and red dot light is redirected at the eye point on the beam splitter to achieve secondary imaging. Simultaneously, the external target directly penetrates the beam splitter and enters the human eye, completing the fusion of visible light, infrared light, and red dot light. This maximizes the advantages of each component, allows for uninterrupted use day and night, improves aiming accuracy, and significantly reduces the system size and weight by employing a secondary imaging optical path design. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of the fusion red dot aiming system provided by the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the Zhongguang Road route;

[0021] Figure 3 This is a schematic diagram of another embodiment of the fusion red dot aiming system provided by the present invention.

[0022] Explanation of icon numbers:

[0023] label name label name 100 Fusion red dot aiming system 42 Fourth lens 1 Infrared lens group 43 Fifth lens 11 First lens 5 reflector 12 Second lens 6 Second lens group 13 Infrared CMOS sensor 61 Sixth lens 2 LCD screen 62 Seventh Lens 3 Prism 63 Eighth lens 4 First lens group 7 Spectrometer 41 Third lens a Red dot light source

[0024] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Currently, there are roughly two types of red dot sight systems available on the market:

[0029] One method involves using a red dot made of LEDs to directly illuminate a curved beam splitter. The beam splitter reflects the red dot as parallel light into the eye, while the external target simultaneously passes through the beam splitter and enters the eye. The image of the external target and the red dot are then fused on the retina. However, this method has several drawbacks: first, some of the red dot light escapes into the external environment after passing through the curved beam splitter, increasing the risk of exposure; second, the external target light is refracted after passing through the curved mirror, meaning the light entering the eye is no longer parallel, and fusion relies entirely on the eye's own adjustment. When the eye moves, the image of the external target shifts from the position of the red dot, easily causing parallax and reducing aiming accuracy.

[0030] Another approach is to place the red dot in the turning light path. The beam splitter used for fusion is a flat plate, which does not change the light path of the external target and reduces the generation of parallax. However, similar products on the market either only fuse visible light with the red dot, making them unusable at night or in low light conditions; or after fusing near-infrared or infrared light, their size and volume are very large, increasing exposure risk and load.

[0031] In view of this, the present invention provides a fusion red dot aiming system. Figures 1 to 3 This is an embodiment of the fusion red dot aiming system provided by the present invention.

[0032] Please refer to Figures 1 to 2 The fusion red dot aiming system 100 includes an infrared mirror group 1, a liquid crystal display screen 2, a prism 3, a first lens group 4, a reflector 5, a second lens group 6, a beam splitter 7, and an eye point arranged sequentially along the optical path. The prism 3 has an inclined surface facing the first lens group 4, and a red dot light source a is arranged above the inclined surface so that the light from the red dot light source a and the infrared light from the infrared mirror group 1 are optically fused on the prism 3 and then transmitted to the beam splitter 7 to enter the human eye. The external target penetrates the beam splitter 7 and enters the human eye.

[0033] In the technical solution of this invention, the infrared lens group 1 captures an image of the external target, which is then displayed on the liquid crystal display screen 2. The image on the liquid crystal display screen 2 and the light emitted by the red dot light source a are fused on the prism 3, thus completing the fusion of infrared light and red dot light. The fused light passes through the first lens group 4 to complete the first imaging, then passes through the reflector 5 for optical path reversal, effectively shortening the volume, and then passes through the second lens group 6 to reach the beam splitter 7. At this point, the fused optical path of infrared light and red dot light is reversed on the beam splitter 7 to achieve secondary imaging at the eye point. Simultaneously, the external target directly penetrates the beam splitter 7 and enters the human eye, completing the fusion of visible light, infrared light, and red dot light. This maximizes the advantages of each component, allows for uninterrupted use day and night, improves aiming accuracy, and, with the secondary imaging optical path design, significantly reduces the system size and weight.

[0034] It is understandable that, in order to achieve multi-light fusion of (near) infrared, the aiming red dot and visible light, the beam splitter 7 is set between the eye point and the second lens group 6, reflecting the infrared and aiming red dot light into the human eye, while allowing external visible light to be directly transmitted into the human eye. After this multi-light fusion is completed, the beam splitter 7 does not produce any aberrations and is only used for reflection and transmission.

[0035] Furthermore, in the fused red dot sight system 100, the distance from the vertex of the surface of the second lens group 6 along the optical axis through the beam splitter 7 to the eye point is the exit pupil distance, which is 87mm. This effectively reduces the impact on the eye.

[0036] Furthermore, the prism 3 and the reflector 5 are arranged opposite each other, with the reflector 5 tilted towards the first mirror group, and the beam splitter 7 is arranged directly opposite the reflector 5. For example, the light path passes through the prism 3 and the reflector 5 in sequence along the first direction, then turns at the reflector 5 to a second direction before entering the beam splitter 7, thereby reducing the overall space required.

[0037] This invention does not limit the tilt angle of each tilting lens. Preferably, the tilt angles of the prism 3, the reflector 5, and the beam splitter 7 are all 45°. In other embodiments, the tilt angles can also be 30°, 60°, etc., simply by adjusting the positions of the lens and the red dot accordingly.

[0038] The infrared lens group 1 captures images of the outdoor target. Specifically, the infrared lens group 1 includes a first lens 11, a second lens 12, and an infrared CMOS sensor arranged sequentially along the optical path. The infrared CMOS sensor converts the light received by the first lens 11 and the second lens 12 into an image on the liquid crystal display screen 2 through photoelectric conversion. The first lens 11 and the second lens 12 form an objective lens to capture images that are invisible to the human eye, especially at night and in low light conditions, improving the user's perception. Long-wave infrared objectives can be composed of materials such as GE and chalcogenide; alternatively, near-infrared low-light objectives can be used, employing FK series and LAK series high-dispersion materials combined with ZLAF and ZF high-refractive-index materials to correct aberrations and achieve clear imaging. Similarly, the infrared CMOS sensor can be a long-wave infrared or near-infrared low-light CMOS sensor, which displays the image on the liquid crystal display screen 2 through photoelectric conversion, thus realizing the capture and display of infrared images.

[0039] Preferably, the liquid crystal display screen 2 is an OLED display screen.

[0040] Furthermore, the first lens group 4 includes a third lens 41, a fourth lens 42, and a fifth lens 43. The third lens 41 and the fourth lens 42 are meniscus lenses convex away from each other, and the fifth lens 43 is a biconvex lens. The third lens 41 and the fourth lens 42 are both made of high-refractive-index, low-dispersion glass, with lens parameters satisfying 1.9 < Nd < 2.05 and 15 < Vd < 35. The symmetrical placement of the double meniscus effectively corrects field curvature distortion and coma. The fifth lens 43 is made of biconvex, high-dispersion glass, with lens parameters satisfying 1.75 < Nd < 1.9 and 30 < Vd < 50. This cancels out the residual aberrations of the previous lenses, thereby achieving single-focus imaging.

[0041] Furthermore, the second lens group 6 includes a sixth lens 61, a seventh lens 62, and an eighth lens 63. The sixth lens 61 is a meniscus lens, and the seventh lens 62 and the eighth lens 63 are combined to form a cemented composite. The lens parameters of the sixth lens 61 satisfy 1.7 < Nd < 1.85, 30 < Vd < 55. This effectively corrects residual spherical aberration, astigmatism, and field curvature in single-image processing. Residual aberrations such as distortion and chromatic aberration are offset by the cemented composite formed by the seventh lens 62 and the eighth lens 63. The seventh lens 62 is made of ZF material, and its lens parameters satisfy 1.8 < Nd < 1.95, 15 < Vd < 30. The eighth lens 63 is made of LAK material, and its lens parameters satisfy 1.65 < Nd < 1.75, 50 < Vd < 60. Thus, the entire system achieves aberration optimization and presents excellent image quality.

[0042] It should be understood that at this time, the distance from the vertex of the eighth lens 63 along the optical axis through the beam splitter 7 to the eye point is the exit pupil distance.

[0043] When infrared lens group 1 is configured as a combination of a long-wave infrared objective lens and a corresponding CMOS sensor, in one embodiment, the corresponding lens parameters are designed as follows:

[0044] Table 1 shows the lens parameters of the long-wave infrared objective, namely the parameters of the first lens 11 and the second lens 12.

[0045]

[0046]

[0047] Table 2 shows the coefficients of aspherical and diffraction surfaces for each surface.

[0048]

[0049] Among them, the S2 surface is a diffraction surface with an aspherical base, and the diffraction coefficients are A2 = -17.1972, A4 = -13.3467, and A6 = 4.831.

[0050] When the infrared mirror group 1 is configured as a combination of a low-light (near-infrared) objective lens and a corresponding CMOS sensor, in one embodiment, the infrared mirror group 1 is equipped with six lenses to achieve the corresponding functions. See [link to relevant documentation]. Figure 3 The corresponding lens parameters are designed as follows:

[0051] Table 3 shows the lens parameters.

[0052]

[0053] The lens parameters from the OLED display to the eye point (aperture) are shown in the table below.

[0054]

[0055] It should be understood that the infrared lens group 1 may be configured differently in different embodiments, while the design of the liquid crystal display 2, the prism 3, the first lens group 4, the reflector 5, the second lens group 6, and the beam splitter 7 may be consistent.

[0056] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fusion red dot aiming system, characterized in that, The device includes an infrared mirror group, a liquid crystal display screen, a prism, a first lens group, a reflector, a second lens group, a beam splitter, and an eye point arranged sequentially along the optical path. The prism has an inclined surface facing the first lens group, and a red dot light source is arranged above the inclined surface so that the light from the red dot light source and the infrared light from the infrared mirror group are optically fused on the prism and then transmitted to the beam splitter to enter the human eye. Among them, the external target penetrates the beam splitter and enters the human eye; In the fused red dot sight system, the distance from the vertex of the surface of the second lens group along the optical axis through the beam splitter to the eye point is the exit pupil distance, which is 87mm. The prism and the reflector are arranged opposite each other, the reflector is tilted toward the first lens group, and the beam splitter is arranged directly opposite the reflector; The first lens group consists of a third lens, a fourth lens, and a fifth lens. The third lens and the fourth lens are meniscus lenses that convex away from each other, and the fifth lens is a biconvex lens. The second lens group consists of a sixth lens, a seventh lens, and an eighth lens. The sixth lens is a meniscus lens, and the seventh and eighth lenses are combined to form a cemented joint. The distance from the vertex of the eighth lens along the optical axis through the beam splitter to the eye point is the exit pupil distance.

2. The fusion red dot aiming system as described in claim 1, characterized in that, The tilt angles of the prism, the reflector, and the beam splitter are all 45°.

3. The fusion red dot aiming system as described in claim 1, characterized in that, The infrared mirror group includes a first lens, a second lens, and an infrared CMOS sensor arranged sequentially along the optical path. The infrared CMOS sensor converts the light received by the first lens and the second lens into an image on the liquid crystal display screen through photoelectric conversion.

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