An eyepiece for an lpvo riflescope and a method of designing the same

Abstract

The application discloses an eyepiece module for an LPVO sighting telescope, comprising an eyepiece barrel, an eyepiece frame group and a lens group; the eyepiece frame group comprises an eyepiece frame, an eyepiece pressing ring and a retreat stop ring, the eyepiece frame is arranged in the eyepiece barrel, the eyepiece pressing ring is connected with the eyepiece frame, and the retreat stop ring is connected with the eyepiece pressing ring; the lens group comprises an eyepiece cemented lens and an eyepiece third lens which are sequentially arranged along the direction of incidence of the human eye; the eyepiece pressing ring is arranged on the side of the eyepiece cemented lens away from the human eye and is used for pressing the lens group along the optical axis direction. The eyepiece pressing ring is arranged on the side away from the human eye, the thickness of the structure near the human eye end of the eyepiece is effectively reduced, the thin-wall effect is realized, the mechanical obstruction to the observation field of view is reduced, the tunnel effect of the sighting telescope is reduced, and light weight is realized.

Description

Technical Field

[0001] This invention belongs to the field of scope design technology, specifically relating to an eyepiece for an LPVO scope and its design method. Background Technology

[0002] LPVO (Low Magnification Variable Magnification) white light sights are widely used due to their dual advantages of fast aiming at low magnification and wide angle, and accurate aiming at high magnification and long distance. The eyepiece module, as a key component of the LPVO, is responsible for magnification and diopter adjustment; its structural design is closely related to the optical field of view, user comfort, and equipment reliability.

[0003] Conventional LPVO eyepiece modules employ a one-piece eyepiece frame structure, ensuring structural strength, shock and impact resistance, and waterproof sealing. The eyepiece module structure, comprising the eyepiece tube, eyepiece frame, eyepiece retaining ring, and eyepiece, generally utilizes a thick-walled design. While this structure meets basic assembly and lens placement requirements, it is no longer suitable for the stringent requirements of high-end LPVO white-light sights regarding optical field of view, lightweight design, and user experience. Specifically: (1) Thick-walled structures will create mechanical obstruction, which will easily aggravate the "tunnel feeling" of the scope, compress the field of view, and reduce the effective light transmission diameter of the eyepiece; (2) Thick-walled structures contradict the lightweight requirements of LPVO; (3) The thick-walled structure forces the aperture of the eyepiece diopter adjustment device to be larger, resulting in greater friction on the contact surface, increased rotational inertia, higher torque requirements, heavier feel, and easy jamming during rotation. Summary of the Invention

[0004] The purpose of this invention is to provide an eyepiece for an LPVO sight and its design method, so as to achieve lightweight eyepiece and thin-walled effect of LPVO sight eyepiece, so as to reduce the obstruction of the observation field of view by mechanical structure and reduce "tunneling".

[0005] To solve the above-mentioned technical problems, the present invention provides an eyepiece for an LPVO sight, comprising an eyepiece tube, an eyepiece frame assembly, and a lens assembly; The eyepiece frame assembly includes an eyepiece frame, an eyepiece retaining ring, and a backstop ring. The eyepiece frame is disposed inside the eyepiece tube, the eyepiece retaining ring is connected to the eyepiece frame, and the backstop ring is connected to the eyepiece retaining ring. The lens assembly includes an eyepiece cemented lens and an eyepiece third lens arranged sequentially along the direction of incidence on the human eye. The eyepiece retaining ring is located on the side of the eyepiece cemented lens away from the human eye, and is used to press the lens assembly along the optical axis.

[0006] According to the above scheme, the angle between the outermost edge of the outermost structural component of the eyepiece at the eyepiece cemented lens and the human eye, and the optical axis of the eyepiece, is [value missing]. The angle between the outermost edge of the outermost structural member of the eyepiece at the third lens and the straight line from the eye to the human eye, and the optical axis of the eyepiece, is [value missing]. The eyepiece satisfies .

[0007] According to the above scheme, the outer wall of the eyepiece frame near the human eye is provided with a slope, and the angle between the slope and the optical axis of the eyepiece is [value missing]. The eyepiece satisfies .

[0008] According to the above scheme, the lens assembly includes a spacer ring; the spacer ring is located between the eyepiece cemented lens and the eyepiece third lens.

[0009] According to the above scheme, it includes an eyepiece gasket; the eyepiece gasket is disposed between the eyepiece retaining ring and the lens assembly.

[0010] According to the above scheme, the aperture of the third lens of the eyepiece is... The outer diameter of the outermost structural member at the third lens of the eyepiece is... The eyepiece satisfies .

[0011] According to the above scheme, the cemented eyepiece lens and the third eyepiece lens constitute a Kesselrian eyepiece, and the aperture of the cemented eyepiece lens is smaller than the aperture of the third eyepiece lens.

[0012] According to the above scheme, a first waterproof sealing ring is provided at the end of the eyepiece tube away from the human eye; a second waterproof sealing ring is provided between the eyepiece tube and the eyepiece retaining ring; and a third waterproof sealing ring is provided between the eyepiece retaining ring and the eyepiece frame.

[0013] The present invention also provides a design method for an eyepiece for an LPVO sight, the method being used to design the eyepiece for the LPVO sight described above, comprising: Set the eyepiece field of view in the optical design software and monitor optical vignetting according to the set requirements; Based on the eyepiece field of view requirements, the optical power is allocated to the glass to determine the net aperture of the glass; The thickness of the structural component is determined based on the net diameter of the glass.

[0014] According to the above scheme, the feature is that it includes: calculating the angle formed between the maximum outer diameter of the structural component and the human eye, and setting an inclined surface at the eyepiece edge field of view of the structural component according to the angle.

[0015] Beneficial effects Attached Figure Description Figure 1 This is a schematic diagram of the appearance of an eyepiece module for an LPVO gun sight according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the eyepiece module for LPVO gun sights according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the eyepiece module for LPVO gun sights according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram showing the eyepiece field of view of the present invention being blocked by a structural component; Figure 5 , Figure 6 This is a schematic diagram of the inclined surface arrangement of a structural component according to an embodiment of the present invention.

[0016] In the diagram: 1. Eyepiece tube; 2. Anti-reverse ring; 3. Eyepiece retaining ring; 4. Eyepiece frame; 5. Cemented eyepiece lens; 6. Eyepiece spacer; 7. Third eyepiece lens; 8. Eyepiece gasket; 9. First waterproof sealing ring; 10. Second waterproof sealing ring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0018] refer to Figure 1 The present invention provides an eyepiece module for LPVO rifle sights, including an eyepiece tube 1, an eyepiece frame assembly, and a lens assembly.

[0019] refer to Figure 2 In this embodiment of the invention, the eyepiece frame assembly includes an eyepiece frame 4, an eyepiece retaining ring 3, and a retaining ring 2. The eyepiece frame 4 is disposed inside the eyepiece tube 1. The eyepiece retaining ring 3 is connected to the eyepiece frame 4, and the retaining ring 2 is connected to the eyepiece retaining ring 3. The eyepiece frame assembly is connected by threads between the eyepiece frame 4, the eyepiece retaining ring 3, and the retaining ring 2, facilitating the assembly of the eyepiece module. The lens assembly includes an eyepiece cemented lens 5 and an eyepiece third lens 7 arranged sequentially along the direction of incidence on the human eye. The lens assembly is fixed within the space formed by the eyepiece tube 1 and the eyepiece frame assembly. The eyepiece retaining ring 3 is disposed on the side of the eyepiece cemented lens 5 away from the human eye, and is used to press the lens assembly along the optical axis.

[0020] refer to Figure 1 and Figure 2In traditional white light sights, the eyepiece module's retaining ring is located on the side of the third lens 7 closest to the human eye, which easily leads to redundant structural thickness, forming a "thick wall" and exacerbating the "tunneling" effect of the sight. This invention integrates the eyepiece retaining ring 3 inside the eyepiece, connecting the eyepiece retaining ring 3 and the eyepiece frame 4 into a whole, which can effectively achieve a thin eyepiece wall.

[0021] refer to Figure 2 The eyepiece frame assembly is connected by threads between the eyepiece frame 4, the eyepiece retaining ring 3, and the anti-reverse ring 2, facilitating eyepiece module assembly and improving eyepiece module stability. Specifically, the inner wall of one side of the eyepiece frame 4 has an internal thread, the eyepiece retaining ring 3 has both internal and external threads, and the outer wall of the anti-reverse ring 2 has an external thread. The external thread of the eyepiece retaining ring 3 connects to the internal thread of the eyepiece frame 4, and the external thread of the anti-reverse ring 2 connects to the internal thread of the eyepiece retaining ring 3. The three components are combined to form the eyepiece frame assembly.

[0022] refer to Figure 2 , Figure 3 The eyepiece optical system employs a "Kenell eyepiece" design, with the aperture of the cemented eyepiece lens 5 being smaller than that of the third eyepiece lens 7. The cemented eyepiece lens 5 corrects transverse chromatic aberration and reduces field curvature. The residual field curvature and distortion of the optical system cancel each other out with the residual aberrations of the aiming scope objective and the image-shifting lens. The third eyepiece lens 7 provides the primary optical power, causing diverging light rays to converge into the exit pupil (the position of the human eye's pupil). The "Kenell eyepiece" design allows for a reduction in the aperture of the cemented eyepiece lens 5. Figure 2 The eyepiece cemented lens 5 has a diameter that is 5mm smaller than that of the third eyepiece lens 7, which helps to achieve a "thin-wall" effect.

[0023] refer to Figure 2 , Figure 3 The lens assembly includes an eyepiece spacer 6, which is located between the cemented eyepiece lens 5 and the third eyepiece lens 7. An eyepiece retaining ring 3 engages with the eyepiece spacer 6 along a direction perpendicular to the optical axis. The eyepiece spacer 6 and the cemented eyepiece lens 5 work together to fix the lens assembly. The eyepiece spacer engages with the eyepiece frame 4, and an air gap is provided between the eyepiece spacer 6 and the eyepiece retaining ring 3.

[0024] refer to Figure 3In a preferred embodiment, an eyepiece washer 8 is provided between the eyepiece retaining ring 3 and the lens assembly. Specifically, the eyepiece washer 8 is provided between the eyepiece retaining ring 3 and the cemented eyepiece lens 5; the flatness of the eyepiece washer 8 is better controlled than the protrusion on the eyepiece retaining ring 3, which can more effectively avoid lens tilting and ensure the coaxiality of the eyepiece optical lenses; it can avoid direct contact between the cemented eyepiece lens 5 and the eyepiece retaining ring 3, avoid local stress concentration, disperse pressing stress, and avoid lens edge chipping; in addition, the eyepiece washer 8 forms a stable support between the eyepiece retaining ring 3 and the cemented eyepiece lens 5, reducing the amount of lens displacement when the sight is subjected to impact or vibration, and ensuring the stability of the optical axis. Air guide holes are provided on the eyepiece washer 8 and the eyepiece spacer 6.

[0025] refer to Figure 4 In the preferred embodiment, according to GB / T 18717.3-2002, the human eye's monocular field of view is 150° horizontally and 125° vertically, with an optimal field of view of 30° and an effective field of view of 60°. In the figure, the human eye is located at the theoretical exit pupil diameter position. θ1 is the half-field angle corresponding to the effective aperture of the eyepiece, θ2 is the half-field angle corresponding to the maximum aperture of the eyepiece structure, θ3 is the half-field angle of the optimal field of view for the human eye, and θ4 is the half-field angle of the effective field of view for the human eye. In the figure, Φ1 is the effective aperture of the eyepiece, and Φ2 is the full aperture of the eyepiece. The aperture is defined as follows: Φ3 is the maximum aperture of the eyepiece structure, Φ4 is the aperture corresponding to the optimal viewing area of ​​the human eye, and Φ5 is the aperture corresponding to the effective viewing area of ​​the human eye. The difference between the aperture Φ4 corresponding to the optimal viewing area of ​​the human eye and the effective light-transmitting aperture Φ1 of the eyepiece is the range of field obstruction caused by the thickness of the eyepiece structure. The difference between the optimal viewing area θ3 of the human eye and the effective light-transmitting aperture θ1 of the eyepiece is the angle of field obstruction caused by the thickness of the eyepiece structure. The desired "thin-wall" effect is to reduce the angle of obstruction of the human eye's viewing area due to the thickness of the eyepiece structure.

[0026] refer to Figure 6 The eyepiece's outermost structural element at the eyepiece cemented lens 5 forms an angle θ6 with the optical axis of the eyepiece; the eyepiece's outermost structural element at the eyepiece third lens 7 forms an angle θ2 with the optical axis of the eyepiece; the eyepiece satisfies θ6 ≤ θ2. Specifically, as... Figure 2 In the example, the diameter Φ of the cemented eyepiece lens is 35mm, and the diameter reaches 45mm after the superimposed structural components. The "thin-wall" effect is reflected in the fact that the angle θ6 between the total diameter of the cemented eyepiece lens 5 perpendicular to the optical axis and the center of the human pupil is less than or equal to the angle θ2 between the total diameter of the third eyepiece lens 7 perpendicular to the optical axis and the center of the human pupil. That is, when the human eye observes, the structural component located on the side away from the human eye (the structural component perpendicular to the optical axis at the cemented eyepiece lens 5) will not appear in the field of view.

[0027] refer to Figure 5The outer wall of the eyepiece frame 4, near the human eye, has a slope, and the angle between the slope and the optical axis of the eyepiece is θ5; the eyepiece satisfies θ5≥θ2. Specifically, the position of the human eye in the figure is the exit pupil position of the aiming scope optical system, the distance from the human eye position to the third lens 7 of the eyepiece is the exit pupil distance, and the tilt angle of the slope of the structural component of the third lens 7 in the direction of the human eye is θ5, which is 14.88°, greater than the half field of view θ2 corresponding to the maximum aperture of the eyepiece structure.

[0028] refer to Figure 3 In a preferred embodiment, the aperture of the third lens 7 of the eyepiece is Φ. len The outer diameter of the outermost structural member at the third lens 7 of the eyepiece is Φ. ma x; the eyepiece satisfies Φ max / Φ len <1.125. Specifically, the third lens of the eyepiece has a diameter of 7 Φ. len The maximum aperture of the eyepiece module is Φ, which is 40mm. max It is 45mm thick, with a single-sided structural thickness of only 2.5mm, Φ max / Φ len <1.125, traditional gun sight module Φ max / Φ len <1.26.

[0029] refer to Figure 4 , Figure 5 In the preferred embodiment, the reduction of obstruction to the effective light transmission aperture of the eyepiece makes Φ max / Φ len This represents a 10.7% reduction, meaning the occlusion angle of the human eye's field of view is reduced by 10.7% due to the thickness of the eyepiece structure. The half-field of view θ1 corresponding to the effective aperture of the eyepiece is 11.37°, and the half-field of view θ2 corresponding to the maximum aperture of the eyepiece structure is 12.85°. The occlusion angle on one side due to the thickness of the eyepiece structure is only 1.48°, accounting for 9.8% of the half-field of view of the human eye's optimal field of view.

[0030] In a preferred embodiment, the eyepiece anti-reverse ring adopts a shape of "circular with flattened sides and a central circular hole". The circular annular surface is used to define the position of the eyepiece frame 4, and the flattened sides facilitate the tilting insertion of the eyepiece anti-reverse ring into the middle of the threads at both ends of the eyepiece tube. The inner wall of the eyepiece retaining ring is provided with a step. The right side of the step surface mates with the negative lens step surface of the cemented eyepiece lens to achieve positioning of the cemented eyepiece lens, and the left side of the step surface limits the eyepiece anti-reverse ring.

[0031] refer to Figure 3In a preferred embodiment, the eyepiece further includes a waterproof sealing ring. A first waterproof sealing ring 9 is provided at the end of the eyepiece tube 1 furthest from the human eye for waterproofing between the magnification handwheel and the eyepiece tube 1; a second waterproof sealing ring 10 is provided between the eyepiece tube 1 and the eyepiece retaining ring 3 for waterproofing between the eyepiece tube 1 and the eyepiece frame 4; and a third waterproof sealing ring is provided between the eyepiece retaining ring 3 and the eyepiece frame 4 for waterproofing between the eyepiece retaining ring 3 and the eyepiece frame 4.

[0032] Furthermore, the present invention also provides a design method for an eyepiece for an LPVO sight, the method being used to design an eyepiece for an LPVO sight as described in any of the above claims, the method comprising the following steps: (1) Obtain the glass aperture of the eyepiece optical system.

[0033] The specific steps are as follows: (1-1) Set the eyepiece field of view in the Zemax software and monitor the eyepiece's optical vignetting. The theoretical value of the eyepiece's field of view can be calculated based on the overall magnification of the scope and the objective lens field of view. Appropriate vignetting can improve the image quality of the optical system, but it will reduce the light throughput of the peripheral field of view. Vignetting is a compromise between the aperture of the eyepiece's optical lens and the product's performance. Vignetting should be controlled so that there is no obvious attenuation of illumination visible to the naked eye in the center and peripheral field of view of the eyepiece.

[0034] (1-2) Optimizing the net aperture of the eyepiece glass and achieving thin walls is key to reducing Φ through reasonable optomechanical design. max / Φ len By allocating optical power appropriately, the aperture of the eyepiece glass should be designed to meet the requirements of the eyepiece field of view. The designed aperture should satisfy both the field of view and illumination, while also taking weight reduction into account. (Reference) Figure 2 , Figure 3 The third lens 7 of the eyepiece is made of glass with the largest aperture. Its structural component in the direction perpendicular to the optical axis is only the eyepiece frame 4. The structural component in the direction perpendicular to the optical axis of the cemented eyepiece lens 5 includes the eyepiece retaining ring 3, the eyepiece frame 4, the eyepiece spacer 6, and the eyepiece tube 1.

[0035] (2) Determine the wall thickness of the eyepiece structure.

[0036] The specific steps are as follows: (2-1) Calculate the thickness of structural components under the thin-wall design requirements based on the clear diameter of the eyepiece glass. For the third lens 7 of the eyepiece, components such as a pressure ring (to fix the eyepiece lens) and an eyepiece frame 4 (to adjust the diopter of the eyepiece) may be placed perpendicular to the optical axis. These components will appear in the field of view observed by the human eye, forming obstructions. Through optimized design, these components should appear as "thin" as possible in the field of view. For example... Figure 2In the example, the wall thickness of one side of the eyepiece spacer 6 that mates with the eyepiece cemented lens 5 should be greater than or equal to 1 mm (this side has no threads), the wall thickness of one side of the eyepiece retaining ring 3 that mates with the eyepiece spacer 6 should be greater than or equal to 2 mm (this side has threads), and the wall thickness of one side of the eyepiece frame 4 that mates with the eyepiece retaining ring 3 should be greater than or equal to 1.5 mm (this side has threads). Based on the above structural limitations, this can be achieved by controlling the aperture of the eyepiece lens.

[0037] (2-2) Calculate the angle between the outer diameter of the structural component at its maximum and the center of the human eye's pupil.

[0038] (2-3) Optimize the structure at the eyepiece edge field of view. Based on the calculated included angle, an inclined surface is provided at the eyepiece edge field of view of the structural component. In this embodiment of the patent, a structural scheme with a certain inclined angle is adopted, which can match the field of view of the human eye and form a thin-walled visual effect.

[0039] Specifically, the present invention has the following effects: This invention disassembles the eyepiece frame assembly into multiple parts connected by threads, ensuring both the structural strength of the eyepiece and the internal design of the eyepiece retaining ring. This reduces the thickness of the structural components near the eyepiece, achieving a "thin-wall" effect, reducing the tunneling effect of the scope, and minimizing obstruction of the eyepiece's effective light transmission aperture. max / Φ len It reduces the field of view by 10.7%, and the field of view obstruction angle caused by the thickness of the eyepiece structure on one side is only 1.48°. At the same time, it achieves weight reduction and improves the portability of the sight.

[0040] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0041] Those skilled in the art will readily understand that the above description is merely 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 within the scope of protection of the present invention.

Claims

1. An ocular for an LPVO scope, characterized in that, Includes eyepiece tube, eyepiece frame assembly, and lens assembly; The eyepiece frame assembly includes an eyepiece frame, an eyepiece retaining ring, and a backstop ring. The eyepiece frame is disposed inside the eyepiece tube, the eyepiece retaining ring is connected to the eyepiece frame, and the backstop ring is connected to the eyepiece retaining ring. The lens assembly includes an eyepiece cemented lens and an eyepiece third lens arranged sequentially along the direction of incidence on the human eye. The eyepiece retaining ring is located on the side of the eyepiece cemented lens away from the human eye, and is used to press the lens assembly along the optical axis.

2. The eyepiece for an LPVO sight according to claim 1, characterized in that, An outermost structure of the eyepiece at the eyepiece cemented lens has an outer edge, and a straight line from the outer edge to a human eye has an angle with an optical axis of the eyepiece ; An outer side edge of an outermost structure of the eyepiece at the third lens of the eyepiece to a straight line of a human eye makes an angle with an optical axis of the eyepiece ; the eyepiece satisfies .

3. An eyepiece for an LPVO sight according to claim 2, characterized in that, The outer wall of the eyepiece frame, near the human eye, has a bevel, and the angle between the bevel and the optical axis of the eyepiece is [value missing]. The eyepiece satisfies .

4. The eyepiece for an LPVO sight according to claim 1, characterized in that, The lens assembly includes a spacer ring; the spacer ring is located between the eyepiece cemented lens and the eyepiece third lens.

5. An eyepiece for an LPVO sight according to claim 1, characterized in that, Includes an eyepiece gasket; the eyepiece gasket is disposed between the eyepiece retaining ring and the lens assembly.

6. An eyepiece for an LPVO sight according to claim 2, characterized in that, The aperture of the third lens of the eyepiece is The outer diameter of the outermost structural member at the third lens of the eyepiece is... The eyepiece satisfies .

7. An eyepiece for an LPVO sight according to claim 1, characterized in that, The cemented eyepiece lens and the third eyepiece lens form a Kesselrian eyepiece, wherein the aperture of the cemented eyepiece lens is smaller than the aperture of the third eyepiece lens.

8. An eyepiece for an LPVO sight according to claim 1, characterized in that, A first waterproof sealing ring is provided at the end of the eyepiece tube furthest from the human eye; a second waterproof sealing ring is provided between the eyepiece tube and the eyepiece retaining ring; and a third waterproof sealing ring is provided between the eyepiece retaining ring and the eyepiece frame.

9. A method for designing an eyepiece for an LPVO sight, characterized in that, This method is used to design the eyepiece for the LPVO sight as described in any one of claims 1 to 8, comprising: Set the eyepiece field of view in the optical design software and monitor optical vignetting according to the set requirements; Based on the eyepiece field of view requirements, the optical power is allocated to the glass to determine the net aperture of the glass; The thickness of the structural component is determined based on the net diameter of the glass.

10. The eyepiece design method for an LPVO sight according to claim 9, characterized in that, include: Calculate the angle formed between the maximum outer diameter of the structural component and the human eye, and based on the angle, set an inclined surface at the eyepiece edge field of view of the structural component.

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