Large-view-field high-resolution visible light projection optical system

Abstract

The utility model provides a large-view-field high-resolution visible light projection optical system, which belongs to the technical field of optics and sequentially comprises an LCOS display chip, an illumination prism, a projection lens group, an objective lens group and an exit pupil from inside to outside along the propagation direction of a projection beam. The LCOS display chip is located on the object plane of the projection lens group, and the image plane of the projection lens group is located on the object plane of the objective lens group; a visible light image generated by conversion of the LCOS display chip is projected to an exit pupil in a parallel light form according to a required large field angle, so that visible light scene image information which covers an observation field of view, is high in resolution, is clear and does not have vignetting can be provided for a large-field-of-view visible light detection system under a laboratory environment condition; the problems of incomplete scene image coverage and inconsistent image definition and uniformity of a center view field and an edge view field in a performance test and a simulation test of the visible light detection system can be solved; the large-view-field high-resolution visible light projection optical system can be applied to performance test and simulation verification of a visible light detection system.

Description

Technical Field

[0001] The invention belongs to the field of optical technology, and more specifically to a large-field-of-view and high-resolution visible light projection optical system. Background Art

[0002] In an environment where unmanned systems are widely used on the battlefield, both unmanned systems and anti-unmanned systems require a large amount of real-time scene data for battlefield situation analysis. The amount of data obtained is closely related to the accuracy of the calculation results, and is even a key factor in the victory or defeat of a local battlefield. Therefore, large field of view, high resolution, high sensitivity, and intelligent optical guidance / detection systems have become the development direction of military optoelectronic systems.

[0003] In order to meet the ground simulation test of such military optoelectronic systems, improve the algorithm iteration efficiency, and evaluate the accuracy of model results, it is necessary to carry out technical research on the corresponding projection optical system, which is one of the key components of ground simulation equipment. The present invention is aimed at a large-field-of-view visible light detection system, and has carried out a design of a visible light projection optical system with a large field of view (above 35°×35°), high resolution (120lp / mm), large aperture (F#1.7), and an exit pupil (exit pupil distance 95mm).

[0004] A large-field-of-view and high-resolution visible light projection optical system is provided. Summary of the invention

[0005] The present invention provides a large-field-of-view, high-resolution visible light projection optical system, which can provide a large-field-of-view visible light detection system with high-resolution, clear, and vignetting-free visible light scene image information covering its observation field of view under laboratory environment conditions, and can solve the problems of incomplete scene image coverage and inconsistent clarity and uniformity of images in the central field of view and the edge field of view in performance testing and simulation experiments of the visible light detection system; the large-field-of-view, high-resolution visible light projection optical system can be applied to performance testing and simulation verification of the visible light detection system.

[0006] A large-viewing-field and high-resolution visible light projection optical system comprises, from the inside to the outside, an LCOS display chip, an illumination prism, a projection lens group, an objective lens group and an exit pupil in order along the propagation direction of a projection light beam; the LCOS display chip is located on the object plane of the projection lens group, and the image plane of the projection lens group is located on the object plane of the objective lens group; the large-viewing-field and high-resolution visible light projection optical system is used to project a visible light image converted and generated by the LCOS display chip to the exit pupil in the form of parallel light and according to a required large viewing angle, so as to provide a visible light image that fills the viewing field, has high resolution, is clear and has no vignetting for an optical system of a visible light imaging guidance device located at the exit pupil end.

[0007] Furthermore, the projection lens group includes a biconvex positive lens 1, a biconvex positive lens 2, a double cemented positive lens 1, a double cemented negative lens 1, a biconvex positive lens 3, a biconcave negative lens 1, a meniscus negative lens 1, a meniscus positive lens 1, a biconvex positive lens 4, a meniscus positive lens 2, and a biconcave negative lens 2; the objective lens group includes a meniscus negative lens 2, a biconvex positive lens 5, a biconvex positive lens 6, and a meniscus positive lens 3.

[0008] Furthermore, the center distance between the LCOS display chip and the illumination prism is 10 mm; the center distance between the illumination prism and the biconvex positive lens 1 is 4 mm; the center distance between the biconvex positive lens 1 and the biconvex positive lens 2 is 2 mm; the center distance between the biconvex positive lens 2 and the double-cemented positive lens 1 is 16.2 mm; the center distance between the double-cemented positive lens 1 and the double-cemented negative lens 1 is 0.4 mm; the center distance between the double-cemented negative lens 1 and the biconvex positive lens 3 is 0.1 mm; the center distance between the biconvex positive lens 3 and the biconcave negative lens 1 is 20.8 mm; the center distance between the biconcave negative lens 1 and the meniscus negative lens 1 is 8.26 mm; the center distance between the meniscus negative lens 1 and the meniscus negative lens 1 is 8.8 mm. The center distance of the meniscus positive lens one is 19.2mm; the center distance between the meniscus positive lens one and the double convex positive lens four is 0.1mm; the center distance between the double convex positive lens four and the meniscus positive lens two is 17.65mm; the center distance between the meniscus positive lens two and the double concave negative lens two is 41.2mm; the center distance between the double concave negative lens two and the meniscus negative lens two is 116mm; the center distance between the meniscus negative lens two and the double convex positive lens five is 6.3mm; the center distance between the double convex positive lens five and the double convex positive lens six is ​​0.5mm; the center distance between the double convex positive lens six and the meniscus positive lens three is 0.1mm; the center distance between the meniscus positive lens three and the exit pupil is 95mm.

[0009] Furthermore, the optical system has an operating band of 480nm to 700nm, a field of view angle of 49.5°, an F number of 1.7, a focal length of 13.7mm, and an exit pupil distance of 95mm; at 120lp / mm, the modulation transfer function value of the on-axis field of view is ≥0.68, the modulation transfer function value of the off-axis field of view is ≥0.52, and the system distortion is ≤1.35%.

[0010] Beneficial effects:

[0011] 1. The optical system of the present invention can simulate visible light scene images within a 49.5° field of view with a simulation accuracy of 0.3 mrad.

[0012] 2. The optical system of the present invention can realize the projection of 2160×2160 resolution images within the field of view of 35°×35°, and the exit pupil distance is 95mm. It has the characteristics of large simulated field of view, long exit pupil distance and high resolution, and can realize perfect coupling and docking with the pupil of visible light imaging guidance equipment, and the projected image is clear, uniform and without vignetting.

[0013] 3. The optical system of the present invention adopts a secondary imaging structure and an image-side telecentric optical path design to achieve high-resolution, low-distortion projection image display under an asymmetric optical path structure and a large field of view of 49.5°, and the angular resolution of the projection image within the full field of view is 0.3 mrad; through the exit pupil design far away from the outside of the optical system, a perfect coupling and docking with the pupil of the optical system of the docking visible light detection system is achieved, so that the visible light detection system receives a complete, vignetting-free visible light projection image, and the uniformity of the projection image within the full field of view is ≥91.8%.

[0014] 4. In combination with the working characteristics of the optical system described in the present invention, a mathematical simulation model is established to analyze the uniformity of the projected image. The uniformity of the incoherent illumination on the image plane is ≥91.8%, which meets the simulation requirements of the optical imaging guidance equipment.

[0015] 5. In a specific embodiment, the working band of the optical system of the present invention is 480nm~700nm, the field of view angle is 49.5°, the F number is 1.7, and the focal length is 13.7mm; the modulation transfer function value of the on-axis field of view at 120lp / mm is ≥0.68, the modulation transfer function value of the off-axis field of view is ≥0.52, and the system distortion is ≤1.35%; the selected LCOS display chip has a resolution of 3840×2160 and a pixel size of 4.2μm×4.2μm; the optical system has the characteristics of large field of view angle, small relative numerical aperture, high resolution, good uniformity, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the optical path structure of a high-resolution visible light projection optical system of a field of view according to an embodiment of the present invention;

[0017] Figure 2 is a modulation transfer function curve diagram of an embodiment of the present invention;

[0018] Figure 3 is a field curvature and distortion curve diagram of an embodiment of the present invention;

[0019] Figure 4 is a point diagram of an embodiment of the present invention;

[0020] Figure 5 is an energy distribution curve diagram of an embodiment of the present invention;

[0021] Figure 6 is an incoherent illumination diagram of a projection image according to an embodiment of the present invention;

[0022] Figure 7 is an incoherent illumination curve of a projection image in the X direction according to an embodiment of the present invention;

[0023] Figure 8Graph 1 is an incoherent illumination curve of a projection image in the Y direction according to an embodiment of the present invention.

[0024] In the figure: 1-LCOS display chip; 2-illumination prism; 3-biconvex positive lens 1; 4-biconvex positive lens 2; 5-double cemented positive lens 1; 6-double cemented negative lens 1; 7-biconvex positive lens 3; 8-biconcave negative lens 1; 9-meniscus negative lens 1; 10-meniscus positive lens 1; 11-biconvex positive lens 4; 12-meniscus positive lens 2; 13-biconcave negative lens 2; 14-meniscus negative lens 2; 15-biconvex positive lens 5; 16-biconvex positive lens 6; 17-meniscus positive lens 3; 18-exit pupil. DETAILED DESCRIPTION

[0025] like Figure 1-8 As shown, a large-field-of-view high-resolution visible light projection optical system comprises, from the inside to the outside, an LCOS display chip 1, an illumination prism 2, projection lens groups 3 to 13, objective lens groups 14 to 17, and an exit pupil 18 along the propagation direction of the projection light beam. The LCOS display chip is located on the object plane of the projection lens group, and the image plane of the projection lens group is located on the object plane of the objective lens group. The large-field-of-view high-resolution visible light projection optical system is used to project the visible light image converted and generated by the LCOS display chip to the exit pupil in the form of parallel light and according to the required large field of view angle, so as to provide the optical system of the visible light imaging guidance device located at the exit pupil with a visible light image that fills its field of view, has high resolution, is clear, and has no vignetting.

[0026] The projection lens group includes a double convex positive lens 13, a double convex positive lens 24, a double cemented positive lens 15, a double cemented negative lens 16, a double convex positive lens 37, a double concave negative lens 18, a meniscus negative lens 19, a meniscus positive lens 10, a double convex positive lens 4 11, a meniscus positive lens 2 12, and a double concave negative lens 2 13; the objective lens group includes a meniscus negative lens 2 14, a double convex positive lens 5 15, a double convex positive lens 6 16, and a meniscus positive lens 3 17.

[0027] The illumination prism 2 is a positive cubic prism; the inner surface radius of curvature of the biconvex positive lens 3 is 295.7mm, the outer surface radius of curvature is -62.37mm, and the thickness is 6mm; the inner surface radius of curvature of the biconvex positive lens 4 is 59.47mm, the outer surface radius of curvature is -2143mm, and the thickness is 6.5mm; the inner surface radius of curvature of the double-glued positive lens 5 is 47mm, the gluing surface radius of curvature is 20.88mm, the outer surface radius of curvature is -30.2mm, and the thickness is 13.9mm; the inner surface radius of curvature of the double-glued negative lens 6 is -2 9.1mm, the curvature radius of the glued surface is 26.92m, the curvature radius of the outer surface is -156mm, and the thickness is 9.7mm; the curvature radius of the inner surface of the biconvex positive lens 7 is 27.53mm, the curvature radius of the outer surface is -79.8mm, and the thickness is 7.5mm; the curvature radius of the inner surface of the biconcave negative lens 8 is -251.2mm, the curvature radius of the outer surface is 35mm, and the thickness is 4.8mm; the curvature radius of the inner surface of the meniscus negative lens 9 is -12.5mm, the curvature radius of the outer surface is 475mm, and the thickness is 5.3mm; the meniscus positive lens 1 The inner surface radius of curvature of the lens 10 is -66.45mm, the outer surface radius of curvature is -40.55mm, and the thickness is 14mm; the inner surface radius of curvature of the biconvex positive lens 11 is 545.7mm, the outer surface radius of curvature is -100.28mm, and the thickness is 15.5mm; the inner surface radius of curvature of the meniscus positive lens 12 is 56.71mm, the outer surface radius of curvature is 209.65mm, and the thickness is 20mm; the inner surface radius of curvature of the biconcave negative lens 13 is -80.18mm, the outer surface radius of curvature is 53.33mm, and the thickness is 8mm; The inner surface radius of curvature of the meniscus negative lens 2 14 is 1051 mm, the outer surface radius of curvature is 180.3 mm, and the thickness is 8 mm; the inner surface radius of curvature of the biconvex positive lens 5 15 is 4064 mm, the outer surface radius of curvature is -138.65 mm, and the thickness is 15.6 mm; the inner surface radius of curvature of the biconvex positive lens 6 16 is 1247.3 mm, the outer surface radius of curvature is -124.96 mm, and the thickness is 15.5 mm; the inner surface radius of curvature of the meniscus positive lens 3 17 is 79.8 mm, the outer surface radius of curvature is 148.75 mm, and the thickness is 13.2 mm.

[0028] The material of the lighting prism 2 is H-K9L, the material of the double convex positive lens 3 is H-ZF6, the material of the double convex positive lens 4 is H-LAK53A, the materials of the cemented parts in the double-cemented positive lens 5 are H-ZBAF21 and H-FK61 respectively, the materials of the cemented parts in the double-cemented negative lens 6 are H-ZF6 and H-FK61 respectively, the material of the double convex positive lens 7 is H-FK61, the material of the double concave negative lens 8 is H-ZBAF21, and the material of the meniscus negative lens 9 is The material of the meniscus positive lens 10 is H-ZBAF21, the material of the double convex positive lens 4 is H-LAF50B, the material of the meniscus positive lens 2 is H-ZK9B, and the material of the double concave negative lens 2 is H-ZF6; the objective lens group includes the meniscus negative lens 2 14 made of H-ZF6, the double convex positive lens 5 15 made of H-ZK9B, the double convex positive lens 6 16 made of H-ZK9B, and the meniscus positive lens 3 17 made of H-ZLAF50B.

[0029] The center distance between the LCOS display chip 1 and the illumination prism 2 is 10mm; the center distance between the illumination prism 2 and the biconvex positive lens 3 is 4mm; the center distance between the biconvex positive lens 3 and the biconvex positive lens 4 is 2mm; the center distance between the biconvex positive lens 4 and the double-cemented positive lens 5 is 16.2mm; the center distance between the double-cemented positive lens 5 and the double-cemented negative lens 6 is 0.4mm; the center distance between the double-cemented negative lens 6 and the biconvex positive lens 37 is 0.1mm; the center distance between the biconvex positive lens 37 and the biconcave negative lens 8 is 20.8mm; the center distance between the biconcave negative lens 8 and the meniscus negative lens 9 is 8.26mm; the center distance between the meniscus negative lens 9 and the meniscus positive lens 10 is 16.2mm. The center distance between the meniscus positive lens 10 and the double convex positive lens 11 is 19.2mm; the center distance between the meniscus positive lens 10 and the double convex positive lens 11 is 0.1mm; the center distance between the double convex positive lens 11 and the meniscus positive lens 12 is 17.65mm; the center distance between the meniscus positive lens 12 and the double concave negative lens 13 is 41.2mm; the center distance between the double concave negative lens 13 and the meniscus negative lens 14 is 116mm; the center distance between the meniscus negative lens 14 and the double convex positive lens 15 is 6.3mm; the center distance between the double convex positive lens 15 and the double convex positive lens 16 is 0.5mm; the center distance between the double convex positive lens 16 and the meniscus positive lens 3 17 is 0.1mm; the center distance between the meniscus positive lens 3 17 and the exit pupil 18 is 95mm.

[0030] The optical system of the present invention has an operating band of 480nm to 700nm, a field of view of 49.5°, an F number of 1.7, a focal length of 13.7mm, and an exit pupil distance of 95mm; the modulation transfer function value of the on-axis field of view at 120lp / mm is ≥0.68, the modulation transfer function value of the off-axis field of view is ≥0.52, and the system distortion is ≤1.35%; the selected LCOS display chip has a resolution of 3840×2160 and a pixel size of 4.2μm×4.2μm; the optical system has the characteristics of a large field of view, a small relative numerical aperture, a high resolution, good uniformity, and the like.

[0031] The optical system of the present invention can simulate visible light scene images within a 49.5° field of view, with a simulation accuracy of 0.3 mrad.

[0032] The optical system of the present invention can realize the projection of 2160×2160 resolution images within a 35°×35° field of view, with an exit pupil distance of 95 mm. It has the characteristics of a large simulated field of view, a long exit pupil distance, and a high resolution, and can achieve perfect coupling and docking with the pupil of a visible light imaging guidance device, and the projected image is clear, uniform, and free of vignetting.

[0033] The optical system of the present invention adopts a secondary imaging structure and an image-side telecentric optical path design to achieve high-resolution, low-distortion projection image display under an asymmetric optical path structure and a large field of view of 49.5°, and the angular resolution of the projection image within the full field of view is 0.3 mrad; through the exit pupil design far away from the outside of the optical system, a perfect coupling and docking with the pupil of the optical system of the docking visible light detection system is achieved, so that the visible light detection system receives a complete, vignetting-free visible light projection image, and the uniformity of the projection image within the full field of view is ≥91.8%.

[0034] In combination with the working characteristics of the optical system of the present invention, a mathematical simulation model is established to analyze the uniformity of the projected image. The uniformity of the incoherent illumination on the image plane is ≥91.8%, which meets the simulation requirements of the optical imaging guidance equipment.

[0035] The preferred embodiments listed above further illustrate the objectives, technical solutions and advantages of the present invention in detail. It should be understood 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-field-of-view high-resolution visible light projection optical system, characterized in that: Along the propagation direction of the projection light beam, from inside to outside, there are an LCOS display chip (1), an illumination prism (2), a projection lens group (3-13), an objective lens group (14-17) and an exit pupil (18); the LCOS display chip is located on the object plane of the projection lens group, and the image plane of the projection lens group is located on the object plane of the objective lens group; the visible light image converted and generated by the LCOS display chip (1) is projected to the exit pupil (18) in the form of parallel light according to the required large field of view, and at the end of the exit pupil (18), the optical system of the visible light imaging guidance device provides a visible light image that fills its field of view, has high resolution, is clear, and has no vignetting.

2. The large-field-of-view high-resolution visible light projection optical system according to claim 1, characterized in that: The projection lens group (3-13) comprises a biconvex positive lens 1 (3), a biconvex positive lens 2 (4), a double cemented positive lens 1 (5), a double cemented negative lens 1 (6), a biconvex positive lens 3 (7), a biconcave negative lens 1 (8), a meniscus negative lens 1 (9), a meniscus positive lens 1 (10), a biconvex positive lens 4 (11), a meniscus positive lens 2 (12), and a biconcave negative lens 2 (13); the objective lens group comprises a meniscus negative lens 2 (14), a biconvex positive lens 5 (15), a biconvex positive lens 6 (16), and a meniscus positive lens 3 (17).

3. The large-field-of-view high-resolution visible light projection optical system according to claim 2, characterized in that: The center distance between the LCOS display chip (1) and the illumination prism (2) is 10 mm; the center distance between the illumination prism (2) and the biconvex positive lens 1 (3) is 4 mm; the center distance between the biconvex positive lens 1 (3) and the biconvex positive lens 2 (4) is 2 mm; the center distance between the biconvex positive lens 2 (4) and the double-cemented positive lens 1 (5) is 16.2 mm; the center distance between the double-cemented positive lens 1 (5) and the double-cemented negative lens 1 (6) is 0.4 mm; the center distance between the double-cemented negative lens 1 (6) and the biconvex positive lens 3 (7) is 0.1 mm; the center distance between the biconvex positive lens 3 (7) and the biconcave negative lens 1 (8) is 20.8 mm; the center distance between the biconcave negative lens 1 (8) and the meniscus negative lens 1 (9) is 8.26 mm; the center distance between the meniscus negative lens 1 (9) and the meniscus positive lens 1 (10) is 16.2 mm. The center distance between the first and second convex positive lenses is 19.2 mm; the center distance between the first meniscus positive lens (10) and the second biconvex positive lens (11) is 0.1 mm; the center distance between the second biconvex positive lens (11) and the second meniscus positive lens (12) is 17.65 mm; the center distance between the second meniscus positive lens (12) and the second biconcave negative lens (13) is 41.2 mm; the center distance between the second biconcave negative lens (13) and the second meniscus negative lens (14) is 116 mm; the center distance between the second meniscus negative lens (14) and the second biconvex positive lens (15) is 6.3 mm; the center distance between the second biconvex positive lens (15) and the second biconvex positive lens (16) is 0.5 mm; the center distance between the second biconvex positive lens (16) and the third meniscus positive lens (17) is 0.1 mm; the center distance between the third meniscus positive lens (17) and the exit pupil (18) is 95 mm.

4. The large-field-of-view high-resolution visible light projection optical system according to claim 1, characterized in that: The optical system has an operating band of 480nm to 700nm, a field of view angle of 49.5°, an F number of 1.7, a focal length of 13.7mm, and an exit pupil distance of 95mm; at 120lp / mm, the modulation transfer function value of the on-axis field of view is ≥0.68, the modulation transfer function value of the off-axis field of view is ≥0.52, and the system distortion is ≤1.35%.

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