A dual exit pupil eyepiece for use in high-resolution displays
Patent Information
- Application Number
- CN202521490739.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2035-07-16
AI Technical Summary
通常应用于红外与微光光学成像显示的分辨率为640×512，图像显示效果较低
[0008]本实用新型的第一出瞳具有较长的出瞳距离35mm，出瞳直径为5mm,使人眼可以远离目镜，防止被后坐力撞伤；第二出瞳具有较短的出瞳距离15mm，同时还具有较大的出瞳直径15mm，使其可作为前置镜来连接后续瞄准镜；通过六片式透镜的组合、正负光焦度的分配降低了轴外光束及主光线在各个透镜表面的入射角，降低慧差、像散等光学像差的影响，使其能够在两个出瞳位置均能呈现清晰的虚像；透镜均采用便于加工的标准球面透镜，降低了加工成本；透镜均为球面透镜，使镜头在大批量生产的情况下降低了制造成本，提高了产品性能的一致性；实现显示屏在长距离与短距离均可清晰成像，提高了成像清晰度。
Smart Images
Figure CN224708296U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of infrared optics, and in particular to a dual exit pupil eyepiece for use in high-resolution displays. Background Technology
[0002] An eyepiece is a visual optical device used in optical instruments to observe the image formed by a frontal optical system. It is mainly used for visual observation of small real images in telescopes, microscopes, and small displays. The main function of the eyepiece is to magnify the real image, thereby forming a clear virtual image at the distance of the human eye's clear vision. The imaging quality of the eyepiece directly affects the final image quality observed by the human eye.
[0003] The exit pupil distance of an eyepiece refers to the distance from the vertex of the last surface of the optical system to the intersection of the exit pupil plane and the optical axis. To avoid eyelashes colliding with the last surface of the system and obstructing observation, the exit pupil distance must not be less than a certain value. Typically, the minimum exit pupil distance required for laboratory instruments or general instruments is about 6 mm; while in military optical instruments, considering the use of goggles and gas masks, the exit pupil distance is generally around 20 mm.
[0004] Display resolution refers to a display screen's ability to resolve images. The higher the resolution, the clearer and more detailed the image displayed. A resolution of 640×512 is typically used for infrared and low-light optical imaging displays, resulting in a relatively low image quality. Utility Model Content
[0005] To overcome the shortcomings of existing technologies, the technical problem to be solved by this utility model is to provide a dual exit pupil eyepiece for high-resolution displays. This allows the human eye to be kept away from the eyepiece to prevent injury from recoil. The second exit pupil can be used as a front lens to connect to a subsequent aiming scope. It reduces the incident angle of off-axis beams and principal rays on the surfaces of each lens, reduces the influence of optical aberrations such as coma and astigmatism, and enables the display to present a clear virtual image at both exit pupil positions. This reduces processing costs, lowers manufacturing costs in mass production, improves product performance consistency, and enables clear imaging of the display at both long and short distances, thus improving image clarity.
[0006] The technical solution of this utility model is: This double exit pupil eyepiece applied to a high resolution display screen is provided with a first exit pupil (1), a second exit pupil (2), a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), and a display screen (3) arranged sequentially along the optical axis from the pupil side to the display screen side.
[0007] The first exit pupil has an exit pupil distance of 35mm and an exit pupil diameter of 5mm; the second exit pupil has an exit pupil distance of 15mm and an exit pupil diameter of 15mm; the first and fifth lenses are plano-convex lenses with their convex surfaces facing the exit pupil; the second lens is a plano-concave lens with its concave surface facing the exit pupil; the third lens is a plano-convex lens with its flat surface facing the exit pupil; the fourth lens is a biconvex lens; and the sixth lens is a biconcave lens.
[0008] The first exit pupil of this invention has a relatively long exit pupil distance of 35mm and an exit pupil diameter of 5mm, allowing the human eye to be kept away from the eyepiece and preventing injury from recoil. The second exit pupil has a relatively short exit pupil distance of 15mm and a relatively large exit pupil diameter of 15mm, making it suitable as a front-mounted scope for connecting to a subsequent sight. The combination of six lenses and the distribution of positive and negative optical power reduce the incident angles of off-axis beams and principal rays on the surfaces of each lens, reducing the influence of optical aberrations such as coma and astigmatism, enabling clear virtual images to be presented at both exit pupil positions. All lenses are standard spherical lenses that are easy to manufacture, reducing processing costs. The use of spherical lenses also reduces manufacturing costs during mass production and improves product performance consistency. The system achieves clear imaging of the display screen at both long and short distances, improving image clarity. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the overall structure of a dual exit pupil eyepiece for a high-resolution display screen according to the present invention.
[0010] Figure 2 This is a schematic diagram showing the specific dimensions of the dual exit pupil eyepiece for use in a high-resolution display screen according to the present invention.
[0011] Figure 3 This is the optical transfer function curve of the dual exit pupil eyepiece of this invention, which is applied to a high-resolution display screen.
[0012] Figure 4 This is an optical dot diagram of the dual exit pupil eyepiece of this invention applied to a high-resolution display screen.
[0013] Figure 5 This is a field curvature distortion diagram of the dual exit pupil eyepiece of this utility model applied to a high-resolution display screen. Detailed Implementation
[0014] like Figure 1 , 2 As shown, this dual exit pupil eyepiece for high-resolution displays has a first exit pupil 1, a second exit pupil 2, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a display screen 3 arranged sequentially along the optical axis from the pupil side to the display screen side.
[0015] The first exit pupil has an exit pupil distance of 35mm and an exit pupil diameter of 5mm; the second exit pupil has an exit pupil distance of 15mm and an exit pupil diameter of 15mm; the first and fifth lenses are plano-convex lenses with their convex surfaces facing the exit pupil; the second lens is a plano-concave lens with its concave surface facing the exit pupil; the third lens is a plano-convex lens with its flat surface facing the exit pupil; the fourth lens is a biconvex lens; and the sixth lens is a biconcave lens.
[0016] The first exit pupil of this invention has a relatively long exit pupil distance of 35mm and an exit pupil diameter of 5mm, allowing the human eye to be kept away from the eyepiece and preventing injury from recoil. The second exit pupil has a relatively short exit pupil distance of 15mm and a relatively large exit pupil diameter of 15mm, making it suitable as a front-mounted scope for connecting to a subsequent sight. The combination of six lenses and the distribution of positive and negative optical power reduce the incident angles of off-axis beams and principal rays on the surfaces of each lens, reducing the influence of optical aberrations such as coma and astigmatism, enabling clear virtual images to be presented at both exit pupil positions. All lenses are standard spherical lenses that are easy to manufacture, reducing processing costs. The use of spherical lenses also reduces manufacturing costs during mass production and improves product performance consistency. The system achieves clear imaging of the display screen at both long and short distances, improving image clarity.
[0017] Preferably, the second lens and the third lens are cemented together. The second lens is made of crown glass, and the third lens is made of heavy flint glass. The cementation of the second and third lenses, using crown glass and heavy flint glass respectively, constitutes an achromatic lens, resulting in a compact structure and easy portability.
[0018] Preferably, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, with the following values: 25mm≤f1≤30mm, -25mm≤f2≤-20mm, 30mm≤f3≤35mm, 30mm≤f4≤35mm, 20mm≤f5≤21mm, and -20mm≤f6≤-15mm.
[0019] Preferably, the display screen is an LED display screen with a resolution of 1024×768 and a pixel size of 7.8μm.
[0020] Figure 3 This represents the optical transfer function (OPF) of the eyepiece system. At spatial frequencies of 0–65 lp / mm, the central field-of-view OPF is approximately 0.65, indicating excellent image quality.
[0021] Figure 4The optical dot plot for this dual exit pupil eyepiece used in high-resolution displays shows that the RMS spot radius of the eyepiece is 2.98 μm in the main field of view and 7.39 μm in the peripheral field of view.
[0022] Figure 5 This is a field curvature distortion diagram of a dual exit pupil eyepiece used in high-resolution displays. The maximum distortion of the eyepiece is 1.3%, which is less than 3% and meets the observation requirements.
[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A dual exit pupil eyepiece for use in high-resolution displays, characterized in that: Along the optical axis from the pupil side to the display screen side, the first exit pupil (1), the second exit pupil (2), the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), the fifth lens (L5), the sixth lens (L6), and the display screen (3) are arranged in sequence. The first exit pupil has an exit pupil distance of 35mm and an exit pupil diameter of 5mm; the second exit pupil has an exit pupil distance of 15mm and an exit pupil diameter of 15mm; the first and fifth lenses are plano-convex lenses with their convex surfaces facing the exit pupil; the second lens is a plano-concave lens with its concave surface facing the exit pupil; the third lens is a plano-convex lens with its flat surface facing the exit pupil; the fourth lens is a biconvex lens; and the sixth lens is a biconcave lens.
2. The dual exit pupil eyepiece for a high-resolution display screen according to claim 1, characterized in that: The second lens and the third lens are cemented together. The second lens is made of crown glass and the third lens is made of heavy flint glass.
3. The dual exit pupil eyepiece for a high-resolution display screen according to claim 1, characterized in that: The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6. The following parameters are given: 25mm≤f1≤30mm, -25mm≤f2≤-20mm, 30mm≤f3≤35mm, 30mm≤f4≤35mm, 20mm≤f5≤21mm, and -20mm≤f6≤-15mm.
4. The dual exit pupil eyepiece for a high-resolution display screen according to claim 1, characterized in that: The display screen is an LED display screen with a resolution of 1024×768 and a pixel size of 7.8μm.