High-magnification light-weight eyepiece optical system
By optimizing the lens combination design and material selection, the problem of existing optical systems being unable to simultaneously meet the requirements of high magnification and lightweight design has been solved, resulting in a lightweight eyepiece optical system with good imaging performance, which improves user comfort and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-03-17
AI Technical Summary
Existing optical systems cannot simultaneously meet the requirements of high magnification and lightweight design, resulting in problems such as excessively long and large barrel diameters in the scope, making it inconvenient to carry.
It adopts a combination design of entrance pupil, first lens, second lens, third lens, fourth lens and micro display screen. The lenses use specific materials and structures, including glass positive lens, negative lens and aspherical lens, and the optical system is optimized by cementing connection.
A lightweight eyepiece optical system with high magnification has been achieved, which is lightweight, compact, and has good imaging effect, reduces eye fatigue, lowers costs, and is suitable for mass production.
Smart Images
Figure CN224005355U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical system technology, specifically a high-magnification lightweight eyepiece optical system. Background Technology
[0002] With the continuous development of individual soldier equipment, head-mounted glasses, aiming scopes, and other equipment are also expanding towards informatization, intelligence, lightweighting, and multi-purpose applications. The requirements for magnification and lightweighting of eyepieces are also increasing, and it is necessary to ensure the lightweighting of the equipment so that it is easy to carry and use.
[0003] The magnification of a scope refers to the number of times a distant object is magnified when viewed through the eyepiece. The magnification of a scope is not only related to the convexity of the lens, but also affected by the diameter of the lens. Generally speaking, the higher the magnification of a scope, the larger its barrel length and diameter. However, this requires reasonable design and adjustment of the focal length and position of each lens to ensure clear imaging. How to control the number of required lenses and how to ensure that the eyepiece optical system has the advantages of both high magnification and lightweight design are problems that need to be solved in the prior art. In this regard, this application provides a high-magnification lightweight eyepiece optical system to solve the above problems. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this invention provides a high-magnification, lightweight eyepiece optical system that meets the requirements of both magnification and lightweight design, thus solving the problem that existing optical systems cannot simultaneously meet the requirements of high magnification and lightweight design.
[0006] (II) Technical Solution
[0007] To achieve the aforementioned requirements for both magnification and lightweight design of the eyepiece optical system, this utility model provides the following technical solution: A high-magnification, lightweight eyepiece optical system, comprising an entrance pupil, a first lens, a second lens, a third lens, a fourth lens, and a microdisplay screen, wherein the first lens, second lens, third lens, fourth lens, and microdisplay screen are sequentially arranged along the optical axis toward the eye and toward the microdisplay screen; the first lens and second lens are both positive glass lenses, the third lens is a negative glass lens; the fourth lens is a positive aspherical glass lens, and the second lens and third lens are cemented together to form a negative lens.
[0008] Furthermore, the side of the second lens closest to the microdisplay and the side of the third lens furthest from the microdisplay are glued together.
[0009] Furthermore, the first lens is a biconvex glass positive lens, and the second lens is a convex-concave meniscus glass positive lens.
[0010] Furthermore, the third lens is a convex-concave meniscus glass negative lens, and the third lens uses a lens with a refractive index greater than 1.94.
[0011] Furthermore, the fourth lens is made of low-melting-point glass with a refractive index greater than 1.65.
[0012] (III) Beneficial Effects
[0013] Compared with the prior art, this utility model provides a high-magnification, lightweight eyepiece optical system with the following advantages:
[0014] This high-magnification, lightweight eyepiece optical system, through the coordinated use of the entrance pupil, first lens, second lens, third lens, fourth lens, and micro-display, meets the requirements of both magnification and lightweight design. The entire eyepiece optical system is characterized by its light weight, compact structure, and excellent imaging effect, making it easy to assemble and use. Simultaneously, it significantly reduces eye fatigue during prolonged observation, improving user comfort and reducing the overall cost of the eyepiece, thus facilitating mass production and enhancing the practicality of the eyepiece optical system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the MTF curve of the structural optical system of this utility model;
[0017] Figure 3 This is a schematic diagram of the distortion curve of the structural optical system of this utility model.
[0018] In the diagram: 1 entrance pupil, 2 first lens, 3 second lens, 4 third lens, 5 fourth lens, 6 micro display screen. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] Please see Figures 1 to 3This utility model provides a technical solution: a high-magnification, lightweight eyepiece optical system, including an entrance pupil 1, a first lens 2, a second lens 3, a third lens 4, a fourth lens 5, and a microdisplay 6. The first lens 2, second lens 3, third lens 4, fourth lens 5, and microdisplay 6 are arranged sequentially along the optical axis from the eye towards the microdisplay 6. Through the coordinated use of the entrance pupil 1, first lens 2, second lens 3, third lens 4, fourth lens 5, and microdisplay 6, the magnification and lightweight requirements of the eyepiece optical system can be met. The entire eyepiece optical system is lightweight, compact, and has good imaging effects, making it easy to assemble and use. Simultaneously, it significantly reduces eye fatigue during prolonged observation, improving comfort during use. Furthermore, it reduces the actual cost of the entire eyepiece, facilitating mass production and use, thereby effectively improving the practicality of the eyepiece optical system.
[0021] like Figure 1 , Figure 2 and Figure 3 As shown, it should be noted that both the first lens 2 and the second lens 3 are positive glass lenses. The first lens 2 is a biconvex positive glass lens, and the second lens 3 is a convex-concave meniscus positive glass lens. By using glass lenses, the environmental adaptability of the eyepiece is improved. The third lens 4 is a negative glass lens, also a convex-concave meniscus negative glass lens. The third lens 4 uses a lens with a refractive index greater than 1.94. Specifically, the third lens 4 uses a high refractive index material with a refractive index greater than 1.94, which reduces the spherical aberration of the system and corrects the chromatic aberration of the system. The ratio of the focal length of the first lens 2 to the focal length of the entire lens satisfies the following relationship: 1.2 < |f1 / f| < 2.5, where f is the focal length of the entire lens and f1 is the focal length of the first lens 2.
[0022] In addition, the second lens 3 and the third lens 4 are cemented together to form a negative lens. The side of the second lens 3 closest to the microdisplay 6 and the side of the third lens 4 furthest from the microdisplay 6 are cemented together, so that the second lens 3 and the third lens 4 can be connected to a light source for refraction. The fourth lens 5 is a glass aspherical positive lens. The fourth lens 5 uses a low-melting-point glass lens with a refractive index greater than 1.65. Since the fourth lens 5 is aspherical and uses a low-melting-point glass material with a refractive index greater than 1.65, the aberration of the eyepiece can be reduced, thereby improving the imaging quality of the system.
[0023] In the above embodiment, the magnification is 20x, which is compatible with a 0.37-inch micro-display 6 with 1280×1024 pixels, reducing the overall cost of the eyepiece. The eyepiece can support a micro-display 6 up to 0.39 inches, and the maximum distortion is less than 2.9%, which significantly improves the eye fatigue reduction during long-term observation. The optical back focus distance of the eyepiece is greater than 2.7mm, which can meet the adjustment of more than 6 diopters.
[0024] It should also be noted that the MTF resolution curve of this embodiment is as follows: Figure 2 As shown, the horizontal axis represents the spatial frequency of line pairs per millimeter, and the vertical axis represents the MTF value. Figure 2 As can be seen, this embodiment exhibits good contrast within a spatial frequency range of 40 lp / mm in the central region, meeting the requirements for human visual observation. The optical distortion diagram of this embodiment is shown below. Figure 3 As shown, its maximum distortion is only 2.9%.
[0025] The working principle of the above embodiments is as follows:
[0026] The light source enters the optical system of this high-magnification lightweight eyepiece through the entrance pupil 1, and then is refracted sequentially through the first lens 2, the second lens 3, the third lens 4 and the fourth lens 5, and finally imaged on the micro display screen 6 for the user to view.
[0027] Compared with existing technologies, this high-magnification lightweight eyepiece optical system, through the coordinated use of the entrance pupil 1, first lens 2, second lens 3, third lens 4, fourth lens 5, and microdisplay 6, can meet the magnification and lightweight requirements of an eyepiece optical system. The entire eyepiece optical system is lightweight, compact, and has good imaging effects, making it easy to assemble and use. At the same time, it can significantly reduce eye fatigue during long-term observation, improving the comfort of using the eyepiece optical system. It can also reduce the actual cost of the entire eyepiece, which is conducive to mass production and use. Thus, it effectively improves the practicality of the eyepiece optical system and solves the problem that existing optical systems cannot simultaneously meet the requirements of high magnification and lightweight design.
[0028] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A large magnification lightweight eyepiece optical system comprising an entrance pupil (1), a first lens (2), a second lens (3), a third lens (4), a fourth lens (5) and a micro display screen (6), characterized in that: A first lens (2), a second lens (3), a third lens (4), a fourth lens (5) and a micro display screen (6) are sequentially arranged along an optical axis to the direction of the eye; the first lens (2) and the second lens (3) are both glass positive lenses, the third lens (4) is a glass negative lens; the fourth lens (5) is a glass aspheric positive lens, and the second lens (3) and the third lens (4) are glued to form a negative lens.
2. The high-magnification lightweight eyepiece optical system according to claim 1, characterized by: The second lens (3) is glued to the side close to the micro display screen (6) and the side away from the micro display screen (6) of the third lens (4).
3. The high-magnification lightweight eyepiece optical system according to claim 1, characterized by: The first lens (2) is a double-convex glass positive lens, and the second lens (3) is a convex-concave meniscus glass positive lens.
4. The high-magnification lightweight eyepiece optical system according to claim 1, characterized by: The third lens (4) is a convex-concave meniscus glass negative lens, and the third lens (4) adopts a lens with a refractive index greater than 1.
94.
5. The high-magnification lightweight eyepiece optical system according to claim 1, characterized by: The fourth lens (5) adopts a low-melting-point glass lens with a refractive index greater than 1.65.