Ultra-long-focus high-definition lens for high-altitude unmanned aerial vehicle

Abstract

The utility model provides an ultra-long-focus high-definition lens for a high-altitude unmanned aerial vehicle, particularly relates to the technical field of camera lenses, and is used for solving the technical problem that some traditional lenses are possibly difficult to meet actual application requirements due to image quality decline in a complicated light environment, such as sunlight or night. The lens comprises a lens shell, and a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a diaphragm, a seventh lens element, an eighth lens element, a ninth lens element, a cover and a lens barrel which are arranged in the lens shell and are sequentially arranged from an object side to an image side. Through the synergistic effect of a plurality of lens elements, various aberrations in an optical system are effectively corrected, a wide field angle and a clear imaging effect are achieved, good image quality and definition can be kept even at night or in a complex light environment, and application requirements of diversified scenes are met.

Description

Technical Field

[0001] This utility model relates to the field of camera lens technology, and more specifically, to an ultra-long telephoto high-definition lens for high-altitude drones. Background Technology

[0002] For drone imaging, lens design that prioritizes high definition, a wide field of view, and good night vision capabilities becomes particularly important. Given the characteristics of drone operations at high altitudes, lenses need to provide high-resolution images.

[0003] Existing drone lenses typically employ relatively simple lens combinations, resulting in limited control over aberrations such as optical distortion and chromatic aberration, thus affecting the final image quality. Furthermore, in complex lighting environments, such as under sunlight or at night, some traditional lenses may fail to meet practical application requirements due to image quality degradation. Therefore, developing a high-altitude drone ultra-telephoto high-definition lens capable of providing clear, high-quality imaging in various environments is of significant practical importance. Utility Model Content

[0004] The purpose of this invention is to provide an ultra-long telephoto high-definition lens for high-altitude drones. Through the synergistic effect of multiple lens elements, it effectively corrects various aberrations in the optical system, achieving a wide field of view and clear imaging effect. Even at night or in complex lighting environments, it can maintain good image quality and clarity, meeting the application needs of diverse scenarios.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A high-altitude drone ultra-telephoto high-definition lens includes a lens housing and a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, an aperture, a seventh lens element, an eighth lens element, a ninth lens element, a cover, and a lens barrel, which are arranged in sequence from the object side to the image side inside the lens housing.

[0007] The first lens element is a meniscus lens; the second lens element is a meniscus lens; the third lens element is a biconvex lens; the fourth lens element is a biconcave lens; the fifth lens element is a meniscus lens; the sixth lens element is a meniscus lens; the aperture stop is the diameter controlling the aperture size; the seventh lens element is a meniscus lens; the eighth lens element is a biconcave lens; the ninth lens element is a biconvex lens; a filter is provided on the outer side of the ninth lens element;

[0008] The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element, and the ninth lens element are all glass lens elements.

[0009] In some embodiments, the first lens element satisfies the following condition formula: Nd≥1.92286, Vd≥18.9, where Nd represents the d-ray refractive index of the first lens element material and Vd represents the d-ray Abbe constant of the first lens element material.

[0010] In some embodiments, the second lens element satisfies the following condition formula: Nd≥1.84666, Vd≥23.78, where Nd represents the d-ray refractive index of the second lens element material and Vd represents the d-ray Abbe constant of the second lens element material.

[0011] In some embodiments, the third lens element satisfies the following condition formula: Nd≥1.65691, Vd≥51.12, where Nd represents the d-ray refractive index of the third lens element material and Vd represents the d-ray Abbe constant of the third lens element material.

[0012] In some embodiments, the fourth lens element satisfies the following condition formula: Nd≥1.75520, Vd≥27.53, where Nd represents the d-ray refractive index of the fourth lens element material and Vd represents the d-ray Abbe constant of the fourth lens element material.

[0013] In some embodiments, the fifth lens element satisfies the following condition formula: Nd≥17.5520, Vd≥27.53, where Nd represents the d-ray refractive index of the fifth lens element material and Vd represents the d-ray Abbe constant of the fifth lens element material.

[0014] In some embodiments, the sixth lens element satisfies the following condition formula: Nd≥1.74400, Vd≥44.9, where Nd represents the d-ray refractive index of the sixth lens element material and Vd represents the d-ray Abbe constant of the sixth lens element material.

[0015] In some embodiments, the seventh lens element satisfies the following condition formula: Nd≥1.71736, Vd≥29.5, where Nd represents the d-ray refractive index of the seventh lens element material and Vd represents the d-ray Abbe constant of the seventh lens element material.

[0016] In some embodiments, the eighth lens element satisfies the following condition formula: Nd≥1.60342, Vd≥38.01, where Nd represents the d-ray refractive index of the eighth lens element material and Vd represents the d-ray Abbe constant of the eighth lens element material.

[0017] In some embodiments, the ninth lens element satisfies the following condition formula: Nd≥1.84666, Vd≥23.78, where Nd represents the d-ray refractive index of the material of the ninth lens element, and Vd represents the d-ray Abbe constant of the material of the ninth lens element.

[0018] In some embodiments, the distance from the outermost point of the first lens element L1 on the object side to the imaging surface must satisfy the following formula: total optical length S4 = 75 ± 0.3 mm.

[0019] In some embodiments, the lens housing 1 is an all-metal lens housing.

[0020] In some embodiments, the total height of the lens assembly S2 is 51.9±0.3mm; the total height of the finished lens S3 is 70±0.3mm; the total height of the mechanism S5 is 73.01±0.3mm; the mechanical back focal length S6 is 23.1±0.1mm; and the optical back focal length S7 is 5±0.1mm.

[0021] In some embodiments, the surfaces of the first lens element and the ninth lens element are respectively coated with multilayer broadband AR coatings.

[0022] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0023] 1. This device consists of several key components, each playing a crucial role. The lens housing provides the overall structure, protecting the internal components; the first to sixth lens elements, through precise assembly, effectively correct aberrations in the optical system, ensuring image quality; the aperture controls light throughput, optimizing image brightness and contrast; the seventh to ninth lens elements further enhance optical performance, improving the lens's wide-angle coverage and aperture performance while maintaining good image sharpness. The cap and lens barrel provide a stable fixation, ensuring the lens's reliability. The overall working principle of this lens is as follows: through the synergistic action of multiple lens elements, various aberrations in the optical system are effectively corrected, achieving a wide field of view and clear imaging, and achieving low optical distortion of less than 0.5% at a diagonal viewing angle of 7.19°. The lens features an F3.5 aperture design, meeting the imaging requirements of 2K pixels, and maintaining good image quality and sharpness even at night or in complex lighting environments, fulfilling the application needs of diverse scenarios. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle (UAV) provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram showing the external dimensions of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle (UAV) provided in an embodiment of this utility model.

[0027] Figure 3 A schematic diagram illustrating the imaging process of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle (UAV) provided in an embodiment of this utility model;

[0028] Figure 4 A field curvature curve diagram of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle provided in an embodiment of this utility model;

[0029] Figure 5 A transverse chromatic aberration curve of an ultra-telephoto high-definition lens for high-altitude unmanned aerial vehicles provided in an embodiment of this utility model;

[0030] Figure 6 An axial chromatic aberration curve of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle provided in an embodiment of this utility model;

[0031] Figure 7 A distortion curve diagram of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle provided in an embodiment of this utility model;

[0032] Figure 8 The MTF curve of an ultra-telephoto high-definition lens for a high-altitude unmanned aerial vehicle provided in an embodiment of this utility model.

[0033] Icons: 1. Lens housing; 2. Aperture stop; 3. Filter; L1. First lens element; L2. Second lens element; L3. Third lens element; L4. Fourth lens element; L5. Fifth lens element; L6. Sixth lens element; L7. Seventh lens element; L8. Eighth lens element; L9. Ninth lens element. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Please see Figures 1-3 As shown, the main body of this embodiment is an ultra-telephoto high-definition lens for high-altitude unmanned aerial vehicles, including a lens housing 1 and a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, an aperture 3, a seventh lens element L7, an eighth lens element L8, a ninth lens element L9, a cover, and a lens barrel arranged in sequence from the object side to the image side inside the lens housing 1.

[0040] The first lens element L1 is a meniscus lens; the second lens element L2 is a meniscus lens; the third lens element L3 is a biconvex lens; the fourth lens element L4 is a biconcave lens; the fifth lens element L5 is a meniscus lens; the sixth lens element L6 is a meniscus lens; the aperture stop 2 is the diameter controlling the aperture size; the seventh lens element L7 is a meniscus lens; the eighth lens element L8 is a biconcave lens; the ninth lens element L9 is a biconvex lens; a filter 3 is provided on the outer side of the ninth lens element L9;

[0041] The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8, and the ninth lens element L9 are all glass lens elements.

[0042] Furthermore, the first lens element L1 satisfies the following condition formula: Nd≥1.92286, Vd≥18.9, where Nd represents the d-ray refractive index of the material of the first lens element L1, and Vd represents the d-ray Abbe constant of the material of the first lens element L1.

[0043] Furthermore, the second lens element L2 satisfies the following condition formula: Nd≥1.84666, Vd≥23.78, where Nd represents the d-ray refractive index of the material of the second lens element L2, and Vd represents the d-ray Abbe constant of the material of the second lens element L2.

[0044] Furthermore, the third lens element L3 satisfies the following condition formula: Nd≥1.65691, Vd≥51.12, where Nd represents the d-ray refractive index of the material of the third lens element L3, and Vd represents the d-ray Abbe constant of the material of the third lens element L3.

[0045] Furthermore, the fourth lens element L4 satisfies the following condition formula: Nd≥1.75520, Vd≥27.53, where Nd represents the d-ray refractive index of the fourth lens element L4 material and Vd represents the d-ray Abbe constant of the fourth lens element L4 material.

[0046] Furthermore, the fifth lens element L5 satisfies the following condition formula: Nd≥17.5520, Vd≥27.53, where Nd represents the d-ray refractive index of the material of the fifth lens element L5, and Vd represents the d-ray Abbe constant of the material of the fifth lens element L5.

[0047] Furthermore, the sixth lens element L6 satisfies the following condition formula: Nd≥1.74400, Vd≥44.9, where Nd represents the d-ray refractive index of the material of the sixth lens element L6, and Vd represents the d-ray Abbe constant of the material of the sixth lens element L6.

[0048] Furthermore, the seventh lens element L7 satisfies the following condition formula: Nd≥1.71736, Vd≥29.5, where Nd represents the d-ray refractive index of the seventh lens element L7 material and Vd represents the d-ray Abbe constant of the seventh lens element L7 material.

[0049] Furthermore, the eighth lens element L8 satisfies the following condition formula: Nd≥1.60342, Vd≥38.01, where Nd represents the d-ray refractive index of the material of the eighth lens element L8, and Vd represents the d-ray Abbe constant of the material of the eighth lens element L8.

[0050] Furthermore, the ninth lens element L9 satisfies the following condition formula: Nd≥1.84666, Vd≥23.78, where Nd represents the d-ray refractive index of the material of the ninth lens element L9, and Vd represents the d-ray Abbe constant of the material of the ninth lens element L9.

[0051] Furthermore, the distance from the outermost point of the first lens element L1 on the object side to the imaging surface must satisfy the following formula: total optical length S4 = 75 ± 0.3 mm.

[0052] Furthermore, the lens housing 1 is an all-metal lens housing.

[0053] Furthermore, the total height of the lens assembly S2 is 51.9±0.3mm; the total height of the finished lens S3 is 70±0.3mm; the total height of the mechanism S5 is 73.01±0.3mm; the mechanical back focal length S6 is 23.1±0.1mm; and the optical back focal length S7 is 5±0.1mm.

[0054] Furthermore, the surfaces of the first lens element L1 and the ninth lens element L9 are each coated with a multi-layer broadband AR coating, thereby reducing light reflectivity and increasing the overall transmittance of the lens, thus enhancing the lens's outdoor visibility and ensuring the image quality requirements of the lens in complex outdoor lighting environments.

[0055] In this embodiment, along the optical axis from the object side to the image side, the following elements within the lens housing 1 have the following surface curvatures: the object surface of the first lens element L1 has a radius of curvature of R1, and the mirror surface has a radius of curvature of R2; the object surface of the second lens element L2 has a radius of curvature of R3, and the mirror surface has a radius of curvature of R4; the object surface of the third lens element L3 has a radius of curvature of R5, and the mirror surface has a radius of curvature of R6; the object surface of the fourth lens element L4 has a radius of curvature of R7, and the mirror surface has a radius of curvature of R8; the fifth lens element L5... The object surface has a mirror curvature radius of R9, and the mirror surface has a mirror curvature radius of R10; the object surface of the sixth lens element L6 has a mirror curvature radius of R11, and the mirror surface has a mirror curvature radius of R12; the object surface of the seventh lens element L7 has a mirror curvature radius of R13, and the mirror surface has a mirror curvature radius of R14; the object surface of the eighth lens element L8 has a mirror curvature radius of R15, and the mirror surface has a mirror curvature radius of R16; the object surface of the ninth lens element L9 has a mirror curvature radius of R17, and the mirror surface has a mirror curvature radius of R18.

[0056] Figures 4 to 8 This is a graph showing the optical performance of this embodiment, wherein, Figure 4 This is a field curvature curve, reflecting the change in the focal position of the lens at different field angles (or image heights); Figure 5 This is a chromatic aberration curve, represented by the wavelengths of the commonly used F, d, and C colors, with units in μm; Figure 6 This is an axial chromatic difference curve, represented by the wavelengths of the commonly used F, d, and C colors of light, with units in mm; Figure 7 This is a distortion curve graph, representing the magnitude of distortion under different field of view angles, in percentage (%). Figure 8 The MTF curve represents the overall resolution level of an optical system.

[0057] This invention uses nine glass lenses to effectively correct the aberrations of the optical system, achieving satisfactory optical characteristics and a wide total field of view and aperture. The diagonal angle is 7.19°, the optical distortion is 1%, the total optical length is 75mm, and the aperture is 3.5. It can meet the requirements of 2K pixel level lenses and can satisfy the diverse requirements of different scenes, as well as special application requirements such as clear effect, good night vision effect and less interference under complex lighting conditions.

[0058] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An ultra-long focal length high-definition lens for high-altitude unmanned aerial vehicles, characterized in that, The lens barrel comprises a lens barrel shell (1) and a plurality of lens elements arranged in the lens barrel shell (1) from the object side to the image side, wherein the lens elements comprise a first lens element (L1), a second lens element (L2), a third lens element (L3), a fourth lens element (L4), a fifth lens element (L5), a sixth lens element (L6), a diaphragm (2), a seventh lens element (L7), an eighth lens element (L8), and a ninth lens element (L9). The first lens element (L1), the second lens element (L2), the fifth lens element (L5), the sixth lens element (L6), and the seventh lens element (L7) are meniscus lenses; the third lens element (L3) and the ninth lens element (L9) are biconvex lenses; the fourth lens element (L4) and the eighth lens element (L8) are biconcave lenses; the diaphragm (2) is a diameter for controlling the size of the aperture; and the ninth lens element (L9) is provided with a filter (3). The first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7), the eighth lens element (L8), and the ninth lens element (L9) are all glass lens elements.

2. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The first lens element (L1) to the ninth lens element (L9) respectively satisfy the following conditional formulas: Nd1≥1.92286, Vd1≥18.9; Nd2≥1.84666, Vd2≥23.78; Nd3≥1.65691, Vd3≥51.12; Nd4≥1.75520, Vd4≥27.53; Nd5≥17.5520, Vd5≥27.53; Nd6≥1.74400, Vd6≥44.9; Nd7≥1.71736, Vd7≥29.5; Nd8≥1.60342, Vd8≥38.01; and Nd9≥1.84666, Vd9≥23.78; wherein Nd1, Nd2, Nd3, Nd4, Nd5, Nd6, Nd7, Nd8, and Nd9 respectively represent the d-light refractive index of the material of the first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7), the eighth lens element (L8), and the ninth lens element (L9); and Vd1, Vd2, Vd3, Vd4, Vd5, Vd6, Vd7, Vd8, and Vd9 respectively represent the d-light Abbe number of the material of the first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7), the eighth lens element (L8), and the ninth lens element (L9).

3. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The distance from the outermost point on the object side of the first lens element L1 to the imaging surface satisfies the formula: optical total length S4=75±0.3mm.

4. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The distance from the outermost point on the object side of the first lens element L1 to the imaging surface satisfies the formula: optical total length S4=75±0.3mm.

5. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The lens shell (1) is a full-metal lens shell.

6. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The total height S2 of the lens is 51.9±0.3mm; the total height S3 of the lens product is 70±0.3mm; the total height S5 of the mechanism is 73.01±03mm; the mechanical back focus S6 is 23.1±0.1mm; and the optical back focus S7 is 5±0.1mm.

7. The ultra-long focal length high definition lens for high-altitude unmanned aerial vehicles according to claim 1, characterized in that: The surfaces of the first lens element (L1) and the ninth lens element (L9) are respectively coated with multi-layer wide-band AR coating.

Images