Miniaturized large-target-surface low-distortion aerial photographing lens and module

Abstract

The invention discloses a miniaturized large-target-surface low-distortion aerial photographing lens and module. The aerial photographing lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens which are sequentially arranged from the object side to the image side along the optical axis. Through reasonable lens structure design and curvature radius control, excellent low distortion performance is realized, and the geometric accuracy of an image is ensured. The design of fifteen lenses is adopted, sufficient design freedom is provided, various aberrations such as spherical aberration are effectively corrected, high resolution is achieved, and a large-target-surface photosensitive element is matched; through focal power distribution and aberration correction, the imaging effect of an edge field of view is remarkably improved, and the definition consistency of the center and the edge of a picture is ensured.

Description

Technical Field

[0001] This invention belongs to the field of aerial photography lens technology, and specifically relates to a miniaturized, large-area, low-distortion aerial photography lens and module. Background Technology

[0002] With the rapid development of drone technology, aerial photography drones have become an indispensable part of modern society. They not only provide us with entirely new perspectives and shooting techniques, but also play a vital role in many fields, such as architecture, agriculture, and environmental protection.

[0003] However, the development of aerial drones also faces some challenges and problems. Wide-angle lenses on drones generally suffer from radial and tangential distortion, resulting in significant pixel deformation at the edges of large field-of-view shots. This poses challenges to image geometric accuracy and visual continuity when stitching orthophotos. Traditional aerial photography often uses 1080P or lower resolution modules, making it difficult to capture subtle features in complex scenes. While large-format cameras improve operational efficiency, they require higher lens resolution. Some lenses, due to design or cost limitations, cannot meet high-resolution requirements, leading to decreased edge image quality and blurred details under large-format lenses. Furthermore, in low-light conditions, some aerial lenses are prone to increased noise, affecting image quality. Aerial lenses that meet the requirements of large field of view, high resolution, low distortion, and small package size often have a long overall optical system length, which is inconvenient for carrying and operating drones and other equipment. Meanwhile, some lenses use more aspherical lenses to achieve low distortion, which greatly increases the processing cost; traditional aerial survey lenses are most suitable for full-frame cameras, and generally have the problem of large color difference at the edge of the image frame. This will reduce the accuracy and reliability of aerial surveying, affect the color reproduction of the image, and cause the color of the captured image to deviate from the actual scene.

[0004] Therefore, there is an urgent need for an aerial lens that can maintain a small size while also having a large target area, low distortion, high resolution, and good color reproduction capabilities. Summary of the Invention

[0005] This invention provides a miniaturized, large-area, low-distortion aerial camera lens and module, aiming to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A miniaturized, large-area, low-distortion aerial camera lens includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, an aperture stop, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, and a fifteenth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has positive diopter, with a convex object side and a concave image side; The second lens has negative refractive power, with a convex object-side surface and a concave image-side surface; The third lens has negative refractive power, with a convex object side and a concave image side; The fourth lens has negative refractive power, with a convex object side and a concave image side; The fifth lens has negative refractive power, with a convex object side and a concave image side; The sixth lens is a biconvex lens with positive diopter; The seventh lens has positive diopter, with a concave object side and a convex image side; The eighth lens has negative refractive power, with a concave object side and a convex image side; The ninth lens is a biconvex lens with positive diopter; The tenth lens is a biconvex lens with positive diopter; The eleventh lens is a biconcave lens with negative refractive power; The twelfth lens has positive refractive power, with a convex object side and a concave image side; The thirteenth lens has positive refractive power and its image-side surface is convex. The fourteenth lens has negative refractive power, with a concave object side and a convex image side; The fifteenth lens is a biconvex lens with positive diopter.

[0007] Furthermore, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens form a first group, and the ninth lens, tenth lens, eleventh lens, twelfth lens, thirteenth lens, fourteenth lens, and fifteenth lens form a second group, satisfying the following condition: 1.5 < |fG1 / f| < 5.5; 1.1 < |fG2 / f| < 5.2; Where f is the focal length of the entire lens, fG1 is the focal length of the first group, and fG2 is the focal length of the second group.

[0008] Furthermore, The first lens satisfies the following condition: 0.7 < R12 / R11 < 2.8; Wherein, R11 and R12 are the radii of curvature of the object side and image side of the first lens, respectively; The second lens satisfies the following condition: 1.2 < R21 / R22 < 4; The third lens satisfies the following condition: 1 < R31 / R32 < 3.1; Wherein, R21 and R22 are the radii of curvature of the object side and image side of the second lens, respectively, and R31 and R32 are the radii of curvature of the object side and image side of the third lens, respectively.

[0009] Furthermore, the fifth and sixth lenses form a first cemented doublet, and the seventh and eighth lenses form a second cemented doublet, satisfying the following condition: 0.1<nd5-nd6, vd5-vd6<14; 0.05<nd7-nd8, vd7-vd8<13; Wherein, nd5, nd6, nd7, and nd8 are the refractive indices of the fifth, sixth, seventh, and eighth lenses, respectively, and vd5, vd6, vd7, and vd8 are the Abbe numbers of the fifth, sixth, seventh, and eighth lenses, respectively.

[0010] Furthermore, the Abbe numbers of the first lens, the ninth lens, and the twelfth lens satisfy vd1 > 60, vd9 > 90, and vd12 > 85; the Abbe numbers of the second lens and the fifteenth lens satisfy vd2 < 26 and vd15 < 26. Wherein, vd1, vd2, vd9, vd12, and vd15 are the Abbe numbers of the first lens, the second lens, the ninth lens, the twelfth lens, and the fifteenth lens, respectively.

[0011] Furthermore, the tenth lens, eleventh lens, and twelfth lens constitute a cemented three-layer lens and satisfy the following condition: vd10-vd11>25; vd12-vd11>50; Among them, vd10, vd11, and vd12 are the Abbe numbers of the tenth, eleventh, and twelfth lenses, respectively.

[0012] Furthermore, the refractive indices of the fourteenth and fifteenth lenses satisfy nd14 > 1.8 and nd15 > 1.8; nd14 and nd15 are the refractive indices of the fourteenth and fifteenth lenses, respectively.

[0013] Furthermore, the lens satisfies the following condition: 5 < TTH / IH < 8; 1.5 < CA1 / IH; Where TTH is the total length of the optical system, IH is the half-height of the image plane, and CA1 is the half-aperture of the first lens.

[0014] Furthermore, the relative refractive index temperature coefficients dn / dT of the tenth and thirteenth lenses are <-5; Where dn is the change in refractive index of the optical material, and dT is the change in temperature.

[0015] Furthermore, this application also provides an aerial photography module, including: As described above, a miniaturized, large-area, low-distortion aerial lens; A window is positioned at the front end of the lens; A photosensitive element is disposed on the image side of the lens and is used to receive light and form an image; The base is used to support and fix the lens and the photosensitive element.

[0016] Compared with the prior art, the present invention has the following technical effects: 1. This invention achieves excellent low distortion performance and ensures image geometric accuracy through reasonable lens structure design and radius of curvature control; it adopts a fifteen-lens design, providing sufficient design freedom, effectively correcting various aberrations such as spherical aberration, achieving high resolution, and matching a large target surface photosensitive element; through optical power allocation and aberration correction, it significantly improves the imaging effect of the edge field of view, ensuring consistent sharpness between the center and the edge of the image.

[0017] 2. This invention achieves miniaturization of the lens by effectively controlling the overall length of the optical system through optimized lens shape and structural proportions; it effectively corrects axial chromatic aberration and magnification chromatic aberration by using a reasonable combination of high and low dispersion glass and cemented lenses, resulting in true color reproduction; and it improves the stability of the lens in high and low temperature environments by selecting pyrolytic materials. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lens structure according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of lens parameters according to Embodiment 1 of the present invention; Figure 3 This is the MTF curve of Embodiment 1 of the present invention; Figure 4 This is a field curvature and distortion curve diagram of Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the lens structure according to Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of lens parameters according to Embodiment 2 of the present invention; Figure 7 This is the MTF curve diagram of Embodiment 2 of the present invention; Figure 8 This is a field curvature and distortion curve diagram of Embodiment 2 of the present invention; Figure 9This is a schematic diagram of the lens structure according to Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of lens parameters according to Embodiment 3 of the present invention; Figure 11 This is the MTF curve of Embodiment 3 of the present invention; Figure 12 This is a field curvature and distortion curve diagram of Embodiment 3 of the present invention.

[0019] In the picture: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Eighth lens; 9. Ninth lens; 10. Tenth lens; 11. Eleventh lens; 12. Twelfth lens; 13. Thirteenth lens; 14. Fourteenth lens; 15. Fifteenth lens; 16. Aperture stop. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present application and with reference to the accompanying drawings.

[0021] like Figure 1 As shown, a miniaturized, large-area, low-distortion aerial camera lens includes: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, an aperture 16, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, and a fifteenth lens 15 arranged sequentially along the optical axis from the object side to the image side; The first lens 1 has positive diopter, with a convex object side and a concave image side; The second lens 2 has negative refractive power, with a convex object-side surface and a concave image-side surface; The third lens 3 has negative refractive power, with a convex object side and a concave image side; The fourth lens 4 has negative refractive power, with a convex object side and a concave image side; The fifth lens 5 has negative refractive power, with a convex object side and a concave image side; The sixth lens 6 is a biconvex lens with positive diopter; The seventh lens 7 has positive diopter, with a concave object side and a convex image side; The eighth lens 8 has negative refractive power, with a concave object side and a convex image side; The ninth lens 9 is a biconvex lens with positive diopter; The tenth lens 10 is a biconvex lens with positive diopter; The eleventh lens 11 is a biconcave lens with negative refractive power; The twelfth lens 12 has positive refractive power, with a convex object side and a concave image side; The thirteenth lens 13 has positive refractive power and its image-side surface is convex. The fourteenth lens 14 has negative refractive power, with a concave object side and a convex image side; The fifteenth lens 15 is a biconvex lens with positive diopter. The optical system employs fifteen glass lenses with 26 curvature radius variables to achieve different power distributions, correct spherical aberration, and achieve high resolution.

[0022] like Figure 1 As shown, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 form the first group, and the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, the fourteenth lens 14, and the fifteenth lens 15 form the second group, and satisfy the following condition: 1.5 < |fG1 / f| < 5.5; 1.1 < |fG2 / f| < 5.2; Where f is the focal length of the entire lens, fG1 is the focal length of the first group, and fG2 is the focal length of the second group.

[0023] In one specific implementation, The first lens 1 satisfies the following condition: 0.7 < R12 / R11 < 2.8; Wherein, R11 and R12 are the radii of curvature of the object side and image side of the first lens 1, respectively; By controlling the overall length of the lens within this range, we can minimize its optical length, which is beneficial for miniaturization. It also corrects coma and spherical aberration caused by a large field of view, improves the imaging effect at the edge of the field of view, and ensures that the sharpness of the center and the edge of the image is consistent.

[0024] The second lens 2 satisfies the following condition: 1.2 < R21 / R22 < 4; The third lens 3 satisfies the following condition: 1 < R31 / R32 < 3.1; Where R21 and R22 are the radii of curvature of the object-side and image-side surfaces of the second lens 2, respectively, and R31 and R32 are the radii of curvature of the object-side and image-side surfaces of the third lens 3, respectively. Controlling these within this range can effectively optimize the residual F-tan(theta) distortion of the optical system, which is beneficial for reducing the degree of image distortion.

[0025] like Figure 1 As shown, the fifth lens 5 and the sixth lens 6 form a first cemented doublet, and the seventh lens 7 and the eighth lens 8 form a second cemented doublet, satisfying the following condition: 0.1<nd5-nd6, vd5-vd6<14; 0.05<nd7-nd8, vd7-vd8<13; Wherein, nd5, nd6, nd7, and nd8 are the refractive indices of the fifth lens (5), sixth lens (6), seventh lens (7), and eighth lens (8), respectively, and vd5, vd6, vd7, and vd8 are the Abbe numbers of the fifth lens (5), sixth lens (6), seventh lens (7), and eighth lens (8), respectively. The two cemented lenses have small Abbe number deviations and both employ high refractive indices and high dispersion coefficients. They are primarily used to correct astigmatism and field curvature in the system, improve the large field curvature defect in wide-angle systems, and enhance the imaging performance of off-axis fields of view.

[0026] In one specific embodiment, the Abbe numbers of the first lens 1, the ninth lens 9, and the twelfth lens 12 satisfy vd1 > 60, vd9 > 90, and vd12 > 85; the Abbe numbers of the second lens 2 and the fifteenth lens 15 satisfy vd2 < 26 and vd15 < 26. Wherein, vd1, vd2, vd9, vd12, and vd15 are the Abbe numbers of the first lens 1, the second lens 2, the ninth lens 9, the twelfth lens 12, and the fifteenth lens 15, respectively. The first, ninth, and twelfth lenses use low-dispersion glass, while the second and fifteenth lenses use high-dispersion glass. The high and low dispersion glass corrects for chromatic aberration, resulting in high color fidelity and good performance of the system.

[0027] like Figure 1 As shown, the tenth lens 10, the eleventh lens 11, and the twelfth lens 12 form a cemented triplet lens, and satisfy the following condition: vd10-vd11>25; vd12-vd11>50; Wherein, vd10, vd11, and vd12 are the Abbe numbers of the tenth lens 10, the eleventh lens 11, and the twelfth lens 12, respectively. Chromatic aberration is further corrected using cemented lenses to avoid the blue-purple fringing effect.

[0028] In one specific embodiment, the refractive indices of the fourteenth lens 14 and the fifteenth lens 15 satisfy nd14 > 1.8 and nd15 > 1.8; nd14 and nd15 are the refractive indices of the fourteenth lens 14 and the fifteenth lens 15, respectively. Using a high refractive index reduces the outer diameter of the optical system's tail, while simultaneously lowering the system's sensitivity and improving yield.

[0029] In one specific embodiment, the lens satisfies the following condition: 5 < TTH / IH < 8; 1.5 < CA1 / IH; Where TTH is the total length of the optical system, IH is the half-height of the image plane, and CA1 is the half-aperture of the first lens 1. This gives the optical system the advantages of small size and short total length.

[0030] In one specific embodiment, the relative refractive index temperature coefficient dn / dT of the tenth lens 10 and the thirteenth lens 13 is < -5; Where dn is the change in refractive index of the optical material, and dT is the change in temperature. By limiting the refractive index temperature coefficient of the material, the athermal characteristics of the optical system are corrected, allowing the system to maintain clear imaging even under high and low temperature environments.

[0031] This application also provides an aerial photography module, including: As described above, a miniaturized, large-area, low-distortion aerial lens; A window is positioned at the front end of the lens; A photosensitive element is disposed on the image side of the lens and is used to receive light and form an image; The base is used to support and fix the lens and the photosensitive element.

[0032] Example 1: Figure 1 This is a schematic diagram of the lens structure in Example 1. Figure 2 This is a schematic diagram of the lens parameters for Example 1; Lens parameters: fG1: 31.7; fG2: 28.6; fG1 / f: 3.45; fG2 / f: 3.11; R21 / R22: 2.576635; R31 / R32: 2.084993; R12 / R11: 1.708894; refer to Figure 3 In Embodiment 1 of this invention, all curves show MTF values ​​significantly higher than 0.3 at spatial frequencies up to 32 cycles / mm. This indicates that the lens can resolve very fine details with acceptable contrast attenuation, fully meeting or even exceeding the requirements of high-resolution aerial surveying. This is thanks to the ample design freedom provided by the 15 lenses, which allow for thorough correction of spherical aberration, coma, astigmatism, etc.

[0033] Figure 3In this model, the curves of the central field of view and the maximum peripheral field of view are very close. This means that the difference in image sharpness and contrast from the center to the edge is minimal. This is achieved through the proper allocation of optical power in the front group and the fine correction of field curvature and astigmatism in the rear group.

[0034] Figure 3 The MTF chart shows that the lens of the present invention maintains excellent contrast transmission performance across the entire field of view and at high spatial frequencies, achieving the effects of "high resolution" and "excellent edge image quality".

[0035] refer to Figure 4 The distortion in Embodiment 1 of this invention is only about -1.5% at the maximum field of view. This demonstrates that the lens of this invention performs exceptionally well in controlling image distortion and maintaining image plane flatness. The extremely low field curvature ensures consistent high resolution across the entire image, while the negligible distortion lays the foundation for high-precision mapping and image stitching.

[0036] Example 2: Figure 6 This is a schematic diagram of the lens structure in Example 2. Figure 7 This is a schematic diagram of the lens parameters in Example 2; Lens parameters: fG1: 31.6; fG2: 28.6; fG1 / f: 3.43; fG2 / f: 3.11; R21 / R22: 2.579399; R31 / R32: 2.090305; R12 / R11: 1.708809; refer to Figure 7 In Embodiment 2 of this invention, all curves show MTF values ​​significantly higher than 0.3 at spatial frequencies up to 32 cycles / mm. This indicates that the lens can resolve very fine details with acceptable contrast attenuation, fully meeting or even exceeding the requirements of high-resolution aerial surveying. This is thanks to the ample design freedom provided by the 15 lenses, which allow for thorough correction of spherical aberration, coma, astigmatism, etc.

[0037] Figure 7 In this model, the curves of the central field of view and the maximum peripheral field of view are very close. This means that the difference in image sharpness and contrast from the center to the edge is minimal. This is achieved through the proper allocation of optical power in the front group and the fine correction of field curvature and astigmatism in the rear group.

[0038] Figure 7 The MTF chart shows that the lens of the present invention maintains excellent contrast transmission performance across the entire field of view and at high spatial frequencies, achieving the effects of "high resolution" and "excellent edge image quality".

[0039] refer to Figure 8 In Embodiment 2 of the present invention, the distortion is only about -1.5% at the maximum field of view. This demonstrates that the lens of the present invention performs exceptionally well in controlling image distortion and maintaining image plane flatness. The extremely low field curvature ensures consistent high resolution across the entire image, while the negligible distortion lays the foundation for high-precision surveying and image stitching.

[0040] Example 3: Figure 9 This is a schematic diagram of the lens structure in Example 3. Figure 10 This is a schematic diagram of the lens parameters in Example 3; Lens parameters: fG1: 31.6; fG2: 28.6; fG1 / f: 3.43; fG2 / f: 3.11; R21 / R22: 2.573577; R31 / R32: 2.097074; R12 / R11: 1.706846; refer to Figure 11 In Embodiment 3 of this invention, all curves show MTF values ​​significantly higher than 0.3 at spatial frequencies up to 32 cycles / mm. This indicates that the lens can resolve very fine details with acceptable contrast attenuation, fully meeting or even exceeding the requirements of high-resolution aerial surveying. This is thanks to the ample design freedom provided by the 15 lenses, which allow for thorough correction of spherical aberration, coma, astigmatism, etc.

[0041] Figure 11 In this model, the curves of the central field of view and the maximum peripheral field of view are very close. This means that the difference in image sharpness and contrast from the center to the edge is minimal. This is achieved through the proper allocation of optical power in the front group and the fine correction of field curvature and astigmatism in the rear group.

[0042] Figure 11 The MTF chart shows that the lens of the present invention maintains excellent contrast transmission performance across the entire field of view and at high spatial frequencies, achieving the effects of "high resolution" and "excellent edge image quality".

[0043] refer to Figure 12 In Embodiment 3 of the present invention, the distortion is only about -1.5% at the maximum field of view. This demonstrates that the lens of the present invention performs exceptionally well in controlling image distortion and maintaining image plane flatness. The extremely low field curvature ensures consistent high resolution across the entire image, while the negligible distortion lays the foundation for high-precision mapping and image stitching.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A miniaturized, large-area, low-distortion aerial camera lens, characterized in that, include: The first lens (1), second lens (2), third lens (3), fourth lens (4), fifth lens (5), sixth lens (6), aperture (16), seventh lens (7), eighth lens (8), ninth lens (9), tenth lens (10), eleventh lens (11), twelfth lens (12), thirteenth lens (13), fourteenth lens (14) and fifteenth lens (15) are arranged sequentially from the object side to the image side along the optical axis. The first lens (1) has positive refractive power, with the object side being convex and the image side being concave; The second lens (2) has negative refractive power, with the object side being convex and the image side being concave; The third lens (3) has negative refractive power, with the object side being convex and the image side being concave. The fourth lens (4) has negative refractive power, with the object side being convex and the image side being concave. The fifth lens (5) has negative refractive power, with the object side being convex and the image side being concave. The sixth lens (6) is a biconvex lens with positive diopter; The seventh lens (7) has positive refractive power, with the object side being concave and the image side being convex. The eighth lens (8) has negative refractive power, with the object side being concave and the image side being convex. The ninth lens (9) is a biconvex lens with positive diopter; The tenth lens (10) is a biconvex lens with positive diopter; The eleventh lens (11) is a biconcave lens with negative refractive power; The twelfth lens (12) has positive refractive power, with the object side being convex and the image side being concave. The thirteenth lens (13) has positive refractive power and its image side is convex. The fourteenth lens (14) has negative refractive power, with the object side being concave and the image side being convex. The fifteenth lens (15) is a biconvex lens with positive diopter.

2. The miniaturized, large-area, low-distortion aerial lens according to claim 1, characterized in that, The first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), and the eighth lens (8) form the first group, and the ninth lens (9), the tenth lens (10), the eleventh lens (11), the twelfth lens (12), the thirteenth lens (13), the fourteenth lens (14), and the fifteenth lens (15) form the second group, and satisfy the following condition: 1.5 < |fG1 / f| < 5.5; 1.1 < |fG2 / f| < 5.2; Where f is the focal length of the entire lens, fG1 is the focal length of the first group, and fG2 is the focal length of the second group.

3. The miniaturized, large-area, low-distortion aerial lens according to claim 2, characterized in that, The first lens (1) satisfies the following condition: 0.7 < R12 / R11 < 2.8; Among them, R11 and R12 are the radii of curvature of the object side and the image side of the first lens (1), respectively; The second lens (2) satisfies the following condition: 1.2 < R21 / R22 < 4; The third lens (3) satisfies the following condition: 1 < R31 / R32 < 3.1; R21 and R22 are the radii of curvature of the object side and image side of the second lens (2), respectively, and R31 and R32 are the radii of curvature of the object side and image side of the third lens (3), respectively.

4. The miniaturized, large-area, low-distortion aerial lens according to claim 3, characterized in that, The fifth lens (5) and the sixth lens (6) form a first cemented doublet, and the seventh lens (7) and the eighth lens (8) form a second cemented doublet, satisfying the following condition: 0.1<nd5-nd6, vd5-vd6<14; 0.05<nd7-nd8, vd7-vd8<13; Among them, nd5, nd6, nd7, and nd8 are the refractive indices of the fifth lens (5), the sixth lens (6), the seventh lens (7), and the eighth lens (8), respectively, and vd5, vd6, vd7, and vd8 are the Abbe numbers of the fifth lens (5), the sixth lens (6), the seventh lens (7), and the eighth lens (8), respectively.

5. A miniaturized, large-area, low-distortion aerial lens according to claim 4, characterized in that, The Abbe numbers of the first lens (1), the ninth lens (9), and the twelfth lens (12) satisfy vd1 > 60, vd9 > 90, and vd12 > 85; the Abbe numbers of the second lens (2) and the fifteenth lens (15) satisfy vd2 < 26 and vd15 < 26. Among them, vd1, vd2, vd9, vd12, and vd15 are the Abbe numbers of the first lens (1), the second lens (2), the ninth lens (9), the twelfth lens (12), and the fifteenth lens (15), respectively.

6. A miniaturized, large-area, low-distortion aerial lens according to claim 5, characterized in that, The tenth lens (10), the eleventh lens (11), and the twelfth lens (12) form a cemented triplet lens and satisfy the following condition: vd10-vd11>25; vd12-vd11>50; Among them, vd10, vd11, and vd12 are the Abbe numbers of the tenth lens (10), the eleventh lens (11), and the twelfth lens (12), respectively.

7. A miniaturized, large-area, low-distortion aerial lens according to claim 6, characterized in that, The refractive indices of the fourteenth lens (14) and the fifteenth lens (15) satisfy nd14 > 1.8 and nd15 > 1.8; Among them, nd14 and nd15 are the refractive indices of the fourteenth lens (14) and the fifteenth lens (15), respectively.

8. A miniaturized, large-area, low-distortion aerial lens according to claim 7, characterized in that, The lens satisfies the following condition: 5 < TTH / IH < 8; 1.5 < CA1 / IH; Where TTH is the total length of the optical system, IH is the half-height of the image plane, and CA1 is the half-aperture of the first lens (1).

9. A miniaturized, large-area, low-distortion aerial lens according to claim 8, characterized in that, The relative refractive index temperature coefficients dn / dT of the tenth lens (10) and the thirteenth lens (13) are <-5; Where dn is the change in refractive index of the optical material, and dT is the change in temperature.

10. An aerial photography module, characterized in that, include: Miniaturized large-area low-distortion aerial lens as described in any one of claims 1 to 9; A window is positioned at the front end of the lens; A photosensitive element is disposed on the image side of the lens and is used to receive light and form an image; The base is used to support and fix the lens and the photosensitive element.

Images