Large-aperture optical imaging lens

Abstract

The present application relates to the field of imaging lens, and more particularly to a large image surface optical imaging lens, sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens along an optical axis from an object side to an image side; the first lens to the ninth lens each comprises an object side surface facing the object side and passing imaging light and an image side surface facing the image side and passing imaging light, the present application adopts two plastic aspheric lenses and seven glass spherical lenses to form a nine-piece optical system, the refractive power between the first lens to the ninth lens is reasonably divided, the maximum field of view reaches 102 degrees, the image surface size reaches 1 inch, and the use demand of large image surface is met; when the spatial frequency reaches 200 lp / mm, the MTF of the edge field is greater than 0.40, the imaging clarity is higher, and the imaging effect of the optical system is excellent.

Description

Technical Field

[0001] This invention relates to the field of imaging lenses, and more specifically, to a large image plane optical imaging lens. Background Technology

[0002] With the development of electronic devices such as mobile phones and cameras, the requirements for high definition and wide field of view of imaging lenses are becoming increasingly stringent. In order to present better image quality, existing imaging systems adopt a nine-element or ten-element structure, which has high production costs and a large lens size, making it impossible to meet the requirements of lightweight design. Zoom lenses, on the other hand, can combine the functions of several top-angle lenses, offering greater convenience in shooting and are widely used. Among them, the invention patent with application number 202310484342.4, entitled "An Optical Lens", discloses an optical system composed of seven lenses. This optical lens achieves an MTF of 0.4 at a spatial frequency of 160 lp / mm, an axial aberration of less than 20µm, and a transverse chromatic aberration of less than 3µm, indicating significant potential for improvement in image quality. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a large image plane optical imaging lens, which can solve the technical problems of conventional optical imaging lenses having general imaging effect and large room for improvement.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A large image plane optical imaging lens includes, in sequence along an optical axis from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, an aperture stop, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens; each of the first to ninth lenses includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The first lens has negative refractive power, with a convex object-side surface and a concave image-side surface; 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 concave object side and a convex image side; The fourth lens has positive diopter, and the object side is convex, as is the image side. The fifth lens has positive diopter, and the object side is convex, as is the image side; The sixth lens has negative refractive power, and the object side is concave, as is the image side; The seventh lens has positive diopter, and the object side and the image side are both convex. The eighth lens has negative refractive power, with a concave object side and a convex image side; The ninth lens has positive diopter, with a convex object side and a concave image side; The seventh and eighth lenses form a cemented lens group. And it satisfies the following condition: f7·f8 equals -66.07, -71.01 or -64.97, where f7 and f8 are the focal lengths of the seventh lens and the eighth lens, respectively.

[0005] Furthermore, the following condition applies: (f7·f8) / f equals -8.65, -9.35, or -8.96, where f is the overall focal length of the lens.

[0006] Furthermore, the following conditions must be met: 20 < |f1| < 30, 15 < |f2| < 25, 50 < |f3| < 120, 15 < |f4| < 22, 8 < |f5| < 12, 5 < |f6| < 10, 100 < |f7| < 150, 100 < |f8| < 500, 30 < |f9| < 50, where f1, f2, f3, f4, f5, f6, f7, f8, and f9 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens, respectively.

[0007] Furthermore, the following conditions must be met: 3 < |f1 / f| < 4, 2 < |f2 / f| < 3, 5 < |f3 / f| < 20, 2 < |f4 / f| < 3, 1 < |f5 / f| < 2, 0.5 < |f6 / f| < 1.5, 10 < |f7 / f| < 20, 20 < |f8 / f| < 65, 4 < |f9 / f| < 6, where f1, f2, f3, f4, f5, f6, f7, f8, and f9 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens, respectively, and f is the overall focal length of the lens.

[0008] Furthermore, if the following condition is met, 0.14 <AC stop / TTL; the AC stop The TTL is the air gap between the aperture stop and the optical axis.

[0009] Furthermore, AC satisfies the following condition: stop / TTL<0.18.

[0010] Furthermore, the following condition is met: 0.5 < ∑CT / TTL < 0.55, where ∑CT is the total thickness of the lenses from the first lens to the ninth lens along the optical axis, and TTL is the total optical length of the lens.

[0011] Furthermore, the second and fifth lenses are plastic aspherical lenses.

[0012] Further, the following conditional expression is satisfied: 7.5mm<f<7.7mm, where f is the overall focal length of the lens.

[0013] Further, the following conditional expression is satisfied: TTL≤60mm, where TTL is the total optical length of the lens.

[0014] The beneficial effects of the present invention are as follows: This solution adopts a nine-element optical system composed of two plastic aspherical lenses and seven glass spherical lenses. The optical power distribution between the first lens to the ninth lens is reasonable, the maximum field of view reaches 102°, and the image plane size reaches 1 inch, which meets the use requirements of a large image plane; when the spatial frequency reaches 200 lp / mm, the MTF of the marginal field of view is greater than 0.40, which has high imaging definition. Meanwhile, in the visible light range, the lateral chromatic aberration and longitudinal chromatic aberration are well corrected, and the imaging effect of the optical system is excellent. Brief Description of the Drawings

[0015] In order to more clearly describe the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation on the scope. For those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

[0016] Figure 1 A schematic structural diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 2 An MTF curve diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 3 A defocus curve diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 4 A lateral chromatic aberration curve diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 5 A longitudinal chromatic aberration curve diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 6 A field curvature and distortion diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 7 A relative illuminance diagram of the large-image-plane optical imaging lens described in Embodiment 1 of the present invention; Figure 8 A schematic structural diagram of the large-image-plane optical imaging lens described in Embodiment 2 of the present invention; Figure 9MTF curve of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 10 Defocus curve of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 11 Lateral chromatic aberration curve of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 12 Longitudinal chromatic aberration curve of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 13 Field curvature and distortion diagram of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 14 Relative illumination diagram of the large image plane optical imaging lens described in Embodiment 2 of the present invention; Figure 15 A schematic diagram of the structure of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 16 MTF curve of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 17 Defocus curve of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 18 Lateral chromatic aberration curve of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 19 Longitudinal chromatic aberration curve of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 20 Field curvature and distortion diagram of the large image plane optical imaging lens described in Embodiment 3 of the present invention; Figure 21 The relative illumination diagram of the large image plane optical imaging lens described in Embodiment 3 of the present invention.

[0017] The markings on the accompanying drawings in the above specification are explained as follows: 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. Aperture stop; 11. Filter; 12. Imaging plane. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. 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 represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please refer to Figure 1-21 The present invention provides a large image plane optical imaging lens, which includes, from the object side to the image side along an optical axis, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture stop 10, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9; each of the first lens 1 to the ninth lens 9 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The first lens 1 has negative refractive power, with the object side being convex and the image side being concave; The second lens 2 has negative refractive power, with a convex object side and a concave image side; The third lens 3 has negative refractive power, with a concave object side and a convex image side; The fourth lens 4 has positive refractive power, and both the object-side and image-side surfaces are convex. The fifth lens 5 has positive refractive power, and both the object-side and image-side surfaces are convex. The sixth lens 6 has negative refractive power, and both the object-side and image-side surfaces are concave. The seventh lens 7 has positive refractive power, and both the object-side and image-side surfaces are convex. The eighth lens 8 has negative refractive power, with a concave object side and a convex image side; The ninth lens 9 has positive refractive power, with a convex object-side surface and a concave image-side surface; The seventh lens 7 and the eighth lens 8 constitute a cemented lens group. The cemented lens group effectively corrects chromatic aberration of the optical system and improves the imaging performance of the lens. The second lens 2 and the fifth lens 5 are plastic aspheric lenses, and the first lens 1, the third lens 3, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9 are all glass spherical lenses. The combined use of glass spherical lenses and plastic aspheric lenses is beneficial for correcting secondary spectrum and high-order aberrations. Meanwhile, the use of aspheric lenses facilitates the structural design of the lens, reduces the number of lenses used in the lens on the premise of ensuring the imaging performance of the lens, and lowers the cost.

[0020] Preferably, the following conditional expression is satisfied: 7.5mm<f<7.7mm, where f is the overall focal length of the lens.

[0021] Preferably, the following conditional expression is satisfied: TTL≤60mm, where TTL is the total optical length of the lens.

[0022] Preferably, the following conditional expressions are satisfied: f7·f8 is equal to -66.07, -71.01 or -64.97, and (f7·f8) / f is equal to -8.65, -9.35 or -8.96, where f7 and f8 are the focal lengths of the seventh lens 7 and the eighth lens 8 respectively. Independent control of the focal length of the cemented lens group enables better distribution of optical power. Meanwhile, cementing lenses with low refractive index and high refractive index can better correct chromatic aberration.

[0023] Preferably, the following conditional expressions are satisfied: 20<|f1|<30, 15<|f2|<25, 50<|f3|<120, 15<|f4|<22, 8<|f5|<12, 5<|f6|<10, 100<|f7|<150, 100<|f8|<500, 30<|f9|<50, and 3<|f1 / f|<4, 2<|f2 / f|<3, 5<|f3 / f|<20, 2<|f4 / f|<3, 1<|f5 / f|<2, 0.5<|f6 / f|<1.5, 10<|f7 / f|<20, 20<|f8 / f|<65, 6<|f9 / f|<6, where f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal lengths of 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, the eighth lens 8 and the ninth lens 9 respectively. The conditional expressions effectively distribute the optical power of each lens and provide good imaging performance.

[0024] Preferably, the following conditional expression is satisfied: 0.14<(AC stop / TTL). Controlling within this range can make the travel of light rays at the position of the stop 10 relatively gentle, effectively improve the relative illumination of the lens, and ensure more uniform imaging from the center to the edge of the lens. Further, (ACstop / TTL) <0.18; AC stop This refers to the air gap on the optical axis where the aperture stop is located, specifically the air gap between the image side of the fourth lens 4 and the object side of the fifth lens 5. Controlling this value to less than 0.18 allows for a more reasonable distribution of optical power among the first lens 1 to the ninth lens 9, improving assembly yield.

[0025] Preferably, the following condition is met: 0.5 < ∑CT / TTL < 0.55, where ∑CT is the total thickness of the lenses from the first lens 1 to the ninth lens 9 along the optical axis. This effectively compresses the total length of the lens, achieving miniaturization and meeting the needs of more application scenarios.

[0026] The large image plane optical imaging lens of the present invention will be described in detail below with reference to specific embodiments.

[0027] Example 1 Please refer to Figure 1-7 The present invention provides a large image plane optical imaging lens, which includes, from the object side to the image side along an optical axis, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture stop 10, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9; each of the first lens 1 to the ninth lens 9 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The first lens 1 has negative refractive power, with the object side being convex and the image side being concave; The second lens 2 has negative refractive power, with a convex object side and a concave image side; The third lens 3 has negative refractive power, with a concave object side and a convex image side; The fourth lens 4 has positive refractive power, and both the object-side and image-side surfaces are convex. The fifth lens 5 has positive refractive power, and both the object-side and image-side surfaces are convex. The sixth lens 6 has negative refractive power, and both the object-side and image-side surfaces are concave. The seventh lens 7 has positive refractive power, and both the object-side and image-side surfaces are convex. The eighth lens 8 has negative refractive power, with a concave object side and a convex image side; The ninth lens 9 has positive refractive power, with a convex object-side surface and a concave image-side surface; The seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0028] Detailed optical data for this specific embodiment are shown in Table 1.

[0029] Table 1 Detailed optical data for Example 1

[0030] In this specific embodiment, the second lens 2 and the fifth lens 5 are plastic aspherical lenses. Detailed parameters of the aspherical surfaces of the second lens 2 and the fifth lens 5 are shown in Table 2 below: Table 2: Aspheric Coefficients

[0031] The large image plane optical imaging lens described in this specific embodiment has a focal length of f=7.634 and a light-gathering aperture of F=2.5, which provides better light intake and improves image brightness. The maximum field of view (FOV) is 102°, and the image plane reaches 1". This allows for better rendering of the details of the photographed object and provides better imaging results. The total optical length (TTL) is 60mm, which means that the distance between the object side surface of the first lens and the imaging plane in the optical axis direction is 60mm.

[0032] In this specific embodiment, please refer to the attached diagram for a structural schematic of the large image sensor optical imaging lens. Figure 1 For the MTF curves of the large-image-size optical imaging lens described in this embodiment at different focal lengths within the visible light band of 435nm-660nm, please refer to the attached diagram. Figure 2 As can be seen from the figure, the large-image-size optical imaging lens described in this embodiment has an MTF greater than 0.41 at the edge field of view and an MTF greater than 0.50 at the center field of view when the spatial frequency reaches 200 lp / mm, exhibiting high imaging sharpness and high imaging quality. Please refer to the attached figure for the defocus curve of the large-image-size optical imaging lens described in this embodiment. Figure 3 , by appendix Figure 3 As can be seen, the peak values ​​of the defocus curves for each field of view are close to zero offset from the vertical axis, indicating excellent defocus characteristics and good resolving power under normal temperature conditions. Please refer to the attached diagram for the lateral chromatic aberration curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 4 Attached Figure 4 It can be seen that the maximum lateral chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 4µm; please refer to the attached figure for the longitudinal chromatic aberration curve of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 5 Attached Figure 5 It can be seen that the maximum longitudinal chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 0.03mm, and the lateral and longitudinal chromatic aberrations of the large-image-size optical imaging lens are well corrected. Please refer to the attached figure for the field curvature and distortion curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 6 , by appendix Figure 6It can be seen that the distortion of the large-image-size optical imaging lens is less than 20%, resulting in good image quality and reducing the difficulty of post-correction. The relative illumination diagram of the large-image-size optical imaging lens described in this embodiment in the visible light 435nm-660nm band is shown in the attached figure. Figure 7 , by appendix Figure 7 It can be seen that under the maximum field of view, RI>90%, the relative illumination is high, the brightness of the image is uniform from the center to the edge, and the imaging effect is good.

[0033] Example 2 Please refer to Figure 8-14 The present invention provides a large image plane optical imaging lens, which includes, from the object side to the image side along an optical axis, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture stop 10, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9; each of the first lens 1 to the ninth lens 9 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The first lens 1 has negative refractive power, with the object side being convex and the image side being concave; The second lens 2 has negative refractive power, with a convex object side and a concave image side; The third lens 3 has negative refractive power, with a concave object side and a convex image side; The fourth lens 4 has positive refractive power, and both the object-side and image-side surfaces are convex. The fifth lens 5 has positive refractive power, and both the object-side and image-side surfaces are convex. The sixth lens 6 has negative refractive power, and both the object-side and image-side surfaces are concave. The seventh lens 7 has positive refractive power, and both the object-side and image-side surfaces are convex. The eighth lens 8 has negative refractive power, with a concave object side and a convex image side; The ninth lens 9 has positive refractive power, with a convex object-side surface and a concave image-side surface; The seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0034] Detailed optical data for this specific embodiment are shown in Table 3.

[0035] Table 3 Detailed optical data for Example 2

[0036] In this specific embodiment, the second lens 2 and the fifth lens 5 are plastic aspherical lenses. Detailed parameters of the aspherical surfaces of the second lens 2 and the fifth lens 5 are shown in Table 4 below: Table 4: Aspheric Coefficients

[0037] The large image plane optical imaging lens described in this specific embodiment has a focal length of f=7.597 and a light-gathering aperture of F=2.5, which provides better light intake and improves image brightness. The maximum field of view (FOV) is 102°, and the image plane reaches 1". This allows for better rendering of the details of the photographed object and provides better imaging results. The total optical length (TTL) is 60.001mm, which means that the distance between the object side surface of the first lens and the imaging plane in the optical axis direction is 60mm.

[0038] In this specific embodiment, please refer to the attached diagram for a structural schematic of the large image sensor optical imaging lens. Figure 8 For the MTF curves of the large-image-size optical imaging lens described in this embodiment at different focal lengths within the visible light band of 435nm-660nm, please refer to the attached diagram. Figure 9 As can be seen from the figure, the large-image-size optical imaging lens described in this embodiment has an MTF greater than 0.40 at the edge field of view and an MTF greater than 0.45 at the center field of view when the spatial frequency reaches 200 lp / mm, exhibiting high imaging sharpness and high imaging quality. Please refer to the attached figure for the defocus curve of the large-image-size optical imaging lens described in this embodiment. Figure 10 , by appendix Figure 10 As can be seen, the peak values ​​of the defocus curves for each field of view are close to zero offset from the vertical axis, indicating excellent defocus characteristics and good resolving power under normal temperature conditions. Please refer to the attached diagram for the lateral chromatic aberration curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 11 Attached Figure 11 It can be seen that the maximum lateral chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 5µm; please refer to the attached figure for the longitudinal chromatic aberration curve of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 12 Attached Figure 12 It can be seen that the maximum longitudinal chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 0.03mm, and the lateral and longitudinal chromatic aberrations of the large-image-size optical imaging lens are well corrected. Please refer to the attached figure for the field curvature and distortion curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 13 , by appendix Figure 13 It can be seen that the distortion of the large-image-size optical imaging lens is less than 20%, resulting in good image quality and reducing the difficulty of post-correction. The relative illumination diagram of the large-image-size optical imaging lens described in this embodiment in the visible light 435nm-660nm band is shown in the attached figure. Figure 14 , by appendix Figure 14 It can be seen that under the maximum field of view, RI>91%, the relative illumination is high, the imaging brightness is uniform from the center to the edge, and the imaging effect is good.

[0039] Example 3 Please refer to Figure 15-21 The present invention provides a large image plane optical imaging lens, which includes, from the object side to the image side along an optical axis, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture stop 10, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9; each of the first lens 1 to the ninth lens 9 includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The first lens 1 has negative refractive power, with the object side being convex and the image side being concave; The second lens 2 has negative refractive power, with a convex object side and a concave image side; The third lens 3 has negative refractive power, with a concave object side and a convex image side; The fourth lens 4 has positive refractive power, and both the object-side and image-side surfaces are convex. The fifth lens 5 has positive refractive power, and both the object-side and image-side surfaces are convex. The sixth lens 6 has negative refractive power, and both the object-side and image-side surfaces are concave. The seventh lens 7 has positive refractive power, and both the object-side and image-side surfaces are convex. The eighth lens 8 has negative refractive power, with a concave object side and a convex image side; The ninth lens 9 has positive refractive power, with a convex object-side surface and a concave image-side surface; The seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0040] Detailed optical data for this specific embodiment are shown in Table 5.

[0041] Table 5 Detailed optical data for Example 3

[0042] In this specific embodiment, the second lens 2 and the fifth lens 5 are plastic aspherical lenses. Detailed parameters of the aspherical surfaces of the second lens 2 and the fifth lens 5 are shown in Table 6 below: Table 6: Aspheric Coefficients

[0043] The large image plane optical imaging lens described in this specific embodiment has a focal length of f=7.252 and a light-gathering aperture of F=2.5, which provides good light intake and improves image brightness. The maximum field of view (FOV) is 102°, and the image plane reaches 1". This allows for better rendering of the details of the photographed object and provides better imaging results. The total optical length (TTL) is 60.006mm, which means that the distance between the object side surface of the first lens and the imaging plane in the optical axis direction is 60mm.

[0044] In this specific embodiment, please refer to the attached diagram for a structural schematic of the large image sensor optical imaging lens. Figure 15 For the MTF curves of the large-image-size optical imaging lens described in this embodiment at different focal lengths within the visible light band of 435nm-660nm, please refer to the attached diagram. Figure 16 As can be seen from the figure, the large-image-size optical imaging lens described in this embodiment has an MTF greater than 0.40 at the edge field of view and an MTF greater than 0.45 at the center field of view when the spatial frequency reaches 200 lp / mm, exhibiting high imaging sharpness and high imaging quality. Please refer to the attached figure for the defocus curve of the large-image-size optical imaging lens described in this embodiment. Figure 17 , by appendix Figure 17 As can be seen, the peak values ​​of the defocus curves for each field of view are close to zero offset from the vertical axis, indicating excellent defocus characteristics and good resolving power under normal temperature conditions. Please refer to the attached diagram for the lateral chromatic aberration curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 18 Attached Figure 18 It can be seen that the maximum lateral chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 5µm; please refer to the attached figure for the longitudinal chromatic aberration curve of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 19 Attached Figure 19 It can be seen that the maximum longitudinal chromatic aberration of the large-image-size optical imaging lens in the visible light band is less than 0.03mm, and the lateral and longitudinal chromatic aberrations of the large-image-size optical imaging lens are well corrected. Please refer to the attached figure for the field curvature and distortion curves of the large-image-size optical imaging lens in the visible light 435nm-660nm band described in this embodiment. Figure 20 , by appendix Figure 20 It can be seen that the distortion of the large-image-size optical imaging lens is less than 20%, resulting in good image quality and reducing the difficulty of post-correction. The relative illumination diagram of the large-image-size optical imaging lens described in this embodiment in the visible light 435nm-660nm band is shown in the attached figure. Figure 21 , by appendix Figure 21 It can be seen that under the maximum field of view, RI>90.5%, the relative illumination is high, the brightness of the image is uniform from the center to the edge, and the imaging effect is good.

[0045] Table 7 shows the values ​​of relevant important parameters in three embodiments of this utility model: Table 7: Key parameters for each embodiment

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-image-size optical imaging lens, characterized in that, Along an optical axis from the object side to the image side, the system consists of a first lens, a second lens, a third lens, a fourth lens, an aperture stop, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. Each of the first to ninth lenses includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through. The first lens has negative refractive power, with a convex object-side surface and a concave image-side surface; 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 concave object side and a convex image side; The fourth lens has positive diopter, and the object side is convex, as is the image side. The fifth lens has positive diopter, and the object side is convex, as is the image side; The sixth lens has negative refractive power, and the object side is concave, as is the image side; The seventh lens has positive diopter, and the object side and the image side are both convex. The eighth lens has negative refractive power, with a concave object side and a convex image side; The ninth lens has positive diopter, with a convex object side and a concave image side; The seventh and eighth lenses form a cemented lens group. Furthermore, the following conditions must be met: the seventh lens has an object-side radius of curvature of 13.107 mm, an image-side radius of curvature of -5.205 mm, a thickness of 4.948 mm, a refractive index of 1.57, and a dispersion coefficient of 71.30; the eighth lens has an object-side radius of curvature of -5.205 mm, an image-side radius of curvature of -16.505 mm, a thickness of 1.500 mm, a refractive index of 1.89, and a dispersion coefficient of 40.

85. Alternatively, the seventh lens has an object-side radius of curvature of 11.935 mm, an image-side radius of curvature of -6.258 mm, a thickness of 6.263 mm, a refractive index of 1.57, and a dispersion coefficient of 71.30; the eighth lens has an object-side radius of curvature of -6.258 mm, an image-side radius of curvature of -19.015 mm, a thickness of 1.495 mm, a refractive index of 1.89, and a dispersion coefficient of 40.

85. Alternatively, the seventh lens has an object-side radius of curvature of 11.473 mm, an image-side radius of curvature of -6.176 mm, a thickness of 6.496 mm, a refractive index of 1.57, and a dispersion coefficient of 71.30; the eighth lens has an object-side radius of curvature of -6.176 mm, an image-side radius of curvature of -20.394 mm, a thickness of 1.466 mm, a refractive index of 1.89, and a dispersion coefficient of 40.

85.

2. The large image plane optical imaging lens according to claim 1, characterized in that: The following conditions must be met: 20mm < |f1| < 30mm, 15mm < |f2| < 25mm, 50mm < |f3| < 120mm, 15mm < |f4| < 22mm, 8mm < |f5| < 12mm, 5mm < |f6| < 10mm, 30mm < |f9| < 50mm, where f1, f2, f3, f4, f5, f6, and f9 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and ninth lens, respectively.

3. The large image plane optical imaging lens according to claim 1, characterized in that: Satisfying the following conditional expressions: 3<|f1 / f|<4, 2<|f2 / f|<3, 5<|f3 / f|<20, 2<|f4 / f|<3, 1<|f5 / f|<2, 0.5<|f6 / f|<1.5, 4<|f9 / f|<6, where f1, f2, f3, f4, f5, f6 and f9 are respectively the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the ninth lens, and f is the overall focal length of the lens assembly.

4. The large image plane optical imaging lens according to claim 1, characterized in that: If the following conditions are met, 0.14 <AC stop / TTL; the AC stop The TTL is the air gap between the aperture stop and the optical axis.

5. A large image plane optical imaging lens according to claim 4, characterized in that: AC satisfies the following conditional expression stop / TTL<0.

18.

6. A large image plane optical imaging lens according to claim 1, characterized in that: Satisfying the following conditional expression: 0.5<∑CT / TTL<0.55, where ∑CT is the sum of the thicknesses of the first lens to the ninth lens on the optical axis, and TTL is the total optical length of the lens assembly.

7. A large image plane optical imaging lens according to claim 1, characterized in that: The second lens and the fifth lens are plastic aspherical lenses.

8. A large image plane optical imaging lens according to claim 1, characterized in that: Satisfying the following conditional expression: 7.5mm<f<7.7mm, where f is the overall focal length of the lens assembly.

9. A large image plane optical imaging lens according to claim 1, characterized in that: Satisfying the following conditional expression: TTL≤60mm, where TTL is the total optical length of the lens assembly.

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