An optical imaging lens

Abstract

The application provides an optical imaging lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along an optical axis from an object side to an image side, wherein the lens has good imaging quality, a TTL less than 35mm, adopts a ten-piece design, has a small overall volume, is convenient to install and use, and the distortion of the lens is controlled within 7.5%, so that the difficulty of post-processing algorithm correction can be reduced; and the lens is matched with a sensor, so that the lens has good imaging effect at visible light and night vision 940nm.

Description

Technical Field

[0001] This invention relates to the field of optical imaging lens technology, and more specifically to an optical imaging lens. Background Technology

[0002] Most existing optical imaging lenses suffer from one or more of the following defects: First, the distance from the center of the front surface of the first lens to the image plane is too large, resulting in too many lenses, which increases the overall cost and weight of the lens and limits its installation and use. Second, the lens has large distortion, making it difficult to generate post-processing algorithms. Third, the lens cannot achieve good imaging results in both daytime and night vision conditions. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to propose an optical imaging lens that achieves good image quality by rationally allocating the optical power of each lens, optimizing the surface shape, thickness and distance between each lens, thereby solving the problems mentioned in the background section.

[0004] This invention is achieved through the following technical solution: An optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side. in: The object-side surface of the first lens is convex, the image-side surface of the first lens is concave, and the first lens has negative optical power. The object-side surface of the second lens is convex, the image-side surface of the second lens is concave, and the second lens has negative optical power. The object-side surface of the third lens is convex, the image-side surface of the third lens is concave, and the third lens has negative optical power. The object side of the fourth lens is convex, the image side of the fourth lens is convex, and the fourth lens has positive optical power. The object-side surface of the fifth lens is concave, the image-side surface of the fifth lens is concave, and the fifth lens has negative optical power. The object-side surface of the sixth lens is convex, the image-side surface of the sixth lens is convex, and the sixth lens has positive optical power. The object-side surface of the seventh lens is convex, the image-side surface of the seventh lens is convex, and the seventh lens has positive or negative optical power. The object side of the eighth lens is concave, the image side of the eighth lens is convex, and the seventh lens has positive or negative optical power. The object-side surface of the ninth lens is concave, the image-side surface of the ninth lens is concave, and the ninth lens has negative optical power. The object-side surface of the tenth lens is convex, the image-side surface of the tenth lens is convex, and the tenth lens has positive optical power.

[0005] The beneficial effects of this embodiment are as follows: only ten lenses are needed to form the lens, with the first to sixth lenses forming the front group and the seventh to tenth lenses forming the rear group, making the overall size of the lens small and easy to install and use. By pairing the lens with a 1 / 1.7-inch sensor and adopting a day-night confocal design, it has good imaging quality under both daytime and nighttime conditions.

[0006] Furthermore, absolute value of the focal length of the first lens The following relationship must be satisfied: 22mm≤ ≤42mm; absolute value of the focal length of the second lens The following relationship must be satisfied: 20 mm ≤ ≤30 mm; The absolute value of the focal length of the third lens The following relationship must be satisfied: 9 mm ≤ ≤13 mm; The absolute value of the focal length of the fourth lens The following relationship must be satisfied: 8 mm ≤ ≤10 mm; The absolute value of the focal length of the fifth lens The following relationship must be satisfied: 20 mm ≤ ≤200 mm; The absolute value of the focal length of the sixth lens The following relationship must be satisfied: 8 mm ≤ ≤10mm; The absolute value of the focal length of the seventh lens The following relationship must be satisfied: 30 mm ≤ ≤110 mm; The absolute value of the focal length of the eighth lens The following relationship must be satisfied: 20 mm ≤ ≤350 mm; The absolute value of the focal length of the ninth lens The following relationship must be satisfied: 5mm≤ ≤10 mm; The absolute value of the focal length of the tenth lens The following relationship must be satisfied: 5mm≤ ≤10 mm.

[0007] The beneficial effect of this embodiment is that it further reduces the combined focal length of the lenses, making the lens structure more compact.

[0008] Furthermore, The focal length of the first lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤10; The focal length of the second lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤8; The focal length of the third lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fourth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fifth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤40; The focal length of the sixth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤2.5; The focal length of the seventh lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 8 ≤ / F ≤30; The focal length of the eighth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤85; The focal length of the ninth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2; The focal length of the tenth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2.

[0009] The beneficial effects of this embodiment are: the combined focal length of the lens is further reduced, and the structure of the lens is compact, so that the combined focal length range of the lens is 4.0mm < EFL < 4.3mm, the field of view range is 99° ≤ DFOV ≤ 101°, the aperture Fno=1.8, the total system length TTL ≤ 35mm. With small size, it is extremely convenient to install and use, and the whole lens has a large field of view, compact structure and strong practicability.

[0010] Further, the lens satisfies the following relational expression: 0.4 ≤ f / IMH ≤ 0.5, where f is the effective focal length of the lens, and IMH is the effective image plane size of the lens.

[0011] The beneficial effects of this embodiment are: satisfying the above formula can correct lens distortion well, enabling the lens to achieve a low distortion effect, which is more conducive to the imaging of the lens, and can reduce the difficulty of correcting distortion by later algorithms Further, the lens satisfies the following relational expression: 1 ≤ / ≤ 2, wherein, is the combined focal length of the first lens, the second lens and the third lens; CT1 is the central thickness of the first lens on the optical axis; CT2 is the central thickness of the second lens on the optical axis; CT3 is the central thickness of the third lens on the optical axis.

[0012] The beneficial effects of this embodiment are: when the above formula is satisfied, by controlling the combined focal length of the first lens, the second lens and the third lens, it is conducive to the reasonable distribution of the optical power of the first lens, the second lens and the third lens, thereby reducing the aberration of the imaging system. At the same time, the distortion of the imaging system can be well controlled. Controlling the central thickness of the first lens, the second lens and the third lens can ensure the processability of the first lens, the second lens and the third lens and reduce material waste.

[0013] Further, the lens satisfies the following relational expression: 2 ≤ TTL / (AAG+BFL) ≤ 3, where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, AAG is the sum of air gaps between the first lens to the tenth lens on the optical axis, and BFL is the distance from the image side surface of the tenth lens to the image plane on the optical axis.

[0014] The beneficial effects of this embodiment are: satisfying the above formula can more effectively shorten the system length and ensure imaging quality. At the same time, taking into account the difficulty of lens assembly, the lens can have a better configuration.

[0015] Further, the lens satisfies the following relational expression: 0.5 ≤ fa / fb ≤1.0, where fa is the combined focal length of the first lens to the sixth lens, and fb is the combined focal length of the seventh lens to the tenth lens.

[0016] The beneficial effects of this embodiment are: satisfying the above formula helps to improve the optical MTF performance of the lens, while effectively reducing lens aberrations.

[0017] Furthermore, the third lens and the tenth lens are aspherical glass lenses; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all spherical glass lenses.

[0018] The beneficial effects of this embodiment are as follows: the design using eight spherical glass lenses plus two aspherical glass lenses is beneficial for correcting secondary spectral and higher-order aberrations; at the same time, by rationally allocating the arrangement of the aspherical glass lenses, the optical structure can be optimized while also facilitating lens structure design. The all-glass lens structure design can effectively correct lens temperature drift, ensuring that the lens maintains good working condition under different temperature conditions.

[0019] Furthermore, an aperture stop is provided between the sixth lens and the seventh lens.

[0020] Furthermore, the fifth and sixth lenses are cemented lenses; the seventh and eighth lenses are cemented lenses.

[0021] The beneficial effects of this invention are as follows: An optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side. By rationally allocating the optical power of each lens and optimizing the surface shape, thickness, and distance between each lens, the lens achieves good imaging quality with a TTL of less than 35mm. The ten-element design results in a small overall size and convenient installation and use. Lens distortion is controlled within 7.5%, significantly reducing the difficulty of post-processing algorithm correction. Combined with a sensor, the lens exhibits good imaging performance in both visible light and night vision at 940nm. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the lens structure according to Embodiment 1 of the present invention.

[0023] Figure 2 This is an MTF curve of the lens in Embodiment 1 of the present invention under visible light 435nm-650nm.

[0024] Figure 3 This is a defocus curve of the lens in the visible light range of 435nm-650nm according to an embodiment of the present invention.

[0025] Figure 4 This is the MTF curve of the lens in Embodiment 1 of the present invention under infrared light at 940nm.

[0026] Figure 5 This is a defocus curve of the lens in Embodiment 1 of the present invention at 940nm visible light.

[0027] Figure 6 This is a lateral chromatic aberration curve of the lens in an embodiment of the present invention under visible light 435nm-650nm.

[0028] Figure 7 This is a longitudinal chromatic aberration curve of the lens in Embodiment 1 of the present invention under visible light 435nm-650nm.

[0029] Figure 8 The image shows the field curvature and distortion of the lens in the visible light range of 435nm-650nm according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram of the lens structure in Embodiment 2 of the present invention.

[0031] Figure 10 This is the MTF curve of the lens in Embodiment 2 of the present invention under visible light 435nm-650nm.

[0032] Figure 11 This is a defocus curve of the lens in Embodiment 2 of the present invention in the visible light range of 435nm-650nm.

[0033] Figure 12 This is the MTF curve of the lens in Embodiment 2 of the present invention under infrared light at 940nm.

[0034] Figure 13 This is a defocus curve of the lens in Embodiment 2 of the present invention at 940nm visible light.

[0035] Figure 14 This is a lateral chromatic aberration curve of the lens in Embodiment 2 of the present invention under visible light 435nm-650nm.

[0036] Figure 15 This is a longitudinal chromatic difference curve of the lens in Embodiment 2 of the present invention under visible light 435nm-650nm.

[0037] Figure 16 The image shows the field curvature and distortion of the lens in Embodiment 2 of the present invention under visible light (435nm-650nm).

[0038] Figure 17 This is a schematic diagram of the lens structure in Embodiment 3 of the present invention.

[0039] Figure 18This is the MTF curve of the lens in Embodiment 3 of the present invention under visible light 435nm-650nm.

[0040] Figure 19 This is a defocus curve of the lens in Embodiment 3 of the present invention in the visible light range of 435nm-650nm.

[0041] Figure 20 This is the MTF curve of the lens in Embodiment 3 of the present invention under infrared light at 940nm.

[0042] Figure 21 This is a defocus curve of the lens in Embodiment 3 of the present invention at 940nm visible light.

[0043] Figure 22 This is a lateral chromatic aberration curve of the lens in Embodiment 3 of the present invention under visible light 435nm-650nm.

[0044] Figure 23 This is a longitudinal chromatic difference curve of the lens in Embodiment 3 of the present invention under visible light 435nm-650nm.

[0045] Figure 24 The image shows the field curvature and distortion of the lens in Embodiment 3 of the present invention under visible light (435nm-650nm).

[0046] The above figures include the following reference numerals: 01. First lens; 02. Second lens; 03. Third lens; 04. Fourth lens; 05. Fifth lens; 06. Sixth lens; 07. Seventh lens; 08. Eighth lens; 09. Ninth lens; 10. Tenth lens; 11. Aperture stop; 12. Filter; 13. Imaging plane. Detailed Implementation

[0047] 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 illustrate selected embodiments of the invention.

[0048] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0049] An optical imaging lens includes a first lens 01, a second lens 02, a third lens 03, a fourth lens 04, a fifth lens 05, a sixth lens 06, a seventh lens 07, an eighth lens 08, a ninth lens 09, and a tenth lens 10 arranged sequentially along the optical axis from the object side to the image side. An aperture stop 11 is provided between the sixth lens 06 and the seventh lens 07. A filter 12 and an imaging surface 13 are provided after the tenth lens 10.

[0050] Furthermore, the fifth lens 05 and the sixth lens 06 are cemented lenses; the seventh lens 07 and the eighth lens 08 are cemented lenses.

[0051] in: The object-side surface of the first lens 01 is convex, the image-side surface of the first lens 01 is concave, and the first lens 01 has negative optical power. The object-side surface of the second lens 02 is convex, the image-side surface of the second lens 02 is concave, and the second lens 02 has negative optical power. The object-side surface of the third lens 03 is convex, the image-side surface of the third lens 03 is concave, and the third lens 03 has negative optical power. The object-side surface of the fourth lens 04 is convex, the image-side surface of the fourth lens 04 is convex, and the fourth lens 04 has positive optical power. The object-side surface of the fifth lens 05 is concave, the image-side surface of the fifth lens 05 is concave, and the fifth lens 05 has negative optical power. The object-side surface of the sixth lens 06 is convex, the image-side surface of the sixth lens 06 is convex, and the sixth lens 06 has positive optical power. The object side of the seventh lens 07 is convex, the image side of the seventh lens 07 is convex, and the seventh lens 07 has positive or negative optical power. The object side of the eighth lens 08 is concave, the image side of the eighth lens 08 is convex, and the seventh lens 07 has positive or negative optical power. The object-side surface of the ninth lens 09 is concave, the image-side surface of the ninth lens 09 is concave, and the ninth lens 09 has negative optical power. The object-side surface of the tenth lens 10 is convex, the image-side surface of the tenth lens 10 is convex, and the tenth lens 10 has positive optical power.

[0052] The beneficial effects of this embodiment are as follows: only ten lenses are needed to form the lens, with the first lens 01 to the sixth lens 06 forming the front group of the lens and the seventh lens 07 to the tenth lens 10 forming the rear group of the lens, making the overall size of the lens small and easy to install and use. By matching the lens with a 1 / 1.7-inch sensor and adopting a day and night confocal design, it has good imaging quality under both daytime and nighttime conditions.

[0053] Furthermore, The absolute value of the focal length of the first lens 01 The following relationship must be satisfied: 22mm≤ ≤42mm; The absolute value of the focal length of the second lens 02 The following relationship must be satisfied: 20 mm ≤ ≤30 mm; The absolute value of the focal length of the third lens 03 The following relationship must be satisfied: 9 mm ≤ ≤13 mm; The absolute value of the focal length of the fourth lens 04 The following relationship must be satisfied: 8 mm ≤ ≤10 mm; The absolute value of the focal length of the fifth lens 05 The following relationship must be satisfied: 20 mm ≤ ≤200 mm; The absolute value of the focal length of the sixth lens 06 The following relationship must be satisfied: 8 mm ≤ ≤10mm; The absolute value of the focal length of the seventh lens 07 The following relationship must be satisfied: 30 mm ≤ ≤110 mm; The absolute value of the focal length of the eighth lens 08 The following relationship must be satisfied: 20 mm ≤ ≤350 mm; The absolute value of the focal length of the ninth lens 09 The following relationship must be satisfied: 5mm≤ ≤10 mm; The absolute value of the focal length of the tenth lens 10 The following relationship must be satisfied: 5mm≤ ≤10 mm.

[0054] The beneficial effect of this embodiment is that it further reduces the combined focal length of the lenses, making the lens structure more compact.

[0055] Furthermore, The focal length of the first lens 01 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤10; The focal length of the second lens 02 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤8; The focal length of the third lens 03 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fourth lens 04 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fifth lens 05 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤40; The focal length of the sixth lens 06 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤2.5; The focal length of the seventh lens 07 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 8 ≤ / F ≤30; The focal length of the eighth lens 08 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤85; The focal length of the ninth lens 09 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2; The focal length of the tenth lens 10 The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2.

[0056] The beneficial effects of this embodiment are: the combined focal length of the lens is further reduced, which makes the structure of the lens compact. The combined focal length of the lens is in the range of 4.0mm<EFL<4.3mm, the field of view is in the range of 99°≤DFOV≤101°, the aperture Fno=1.8, the total system length TTL≤35mm. The lens has small volume, which makes its installation and use extremely convenient. In addition, the whole lens has large field of view, compact structure and strong practicability.

[0057] Further, the lens satisfies the following relational expression: 0.4≤f / IMH≤0.5, wherein f is the effective focal length of the lens, and IMH is the effective image plane size of the lens.

[0058] The beneficial effects of this embodiment are: satisfying the above formula can better correct lens distortion, enable the lens to achieve the effect of low distortion, which is more conducive to imaging of the lens, and can reduce the difficulty of correcting distortion by later-stage algorithms Further, the lens satisfies the following relational expression: 1≤ / ≤2, wherein, is the combined focal length of the first lens 01, the second lens 02 and the third lens 03; CT1 is the central thickness of the first lens 01 on the optical axis; CT2 is the central thickness of the second lens 02 on the optical axis; CT3 is the central thickness of the third lens 03 on the optical axis.

[0059] The beneficial effects of this embodiment are: when the above formula is satisfied, by controlling the combined focal length of the first lens 01, the second lens 02 and the third lens 03, it is beneficial to the reasonable distribution of the optical power of the first lens 01, the second lens 02 and the third lens 03, thereby reducing the aberration of the imaging system. Meanwhile, the distortion of the imaging system can be well controlled. Controlling the central thicknesses of the first lens 01, the second lens 02 and the third lens 03 can ensure the processability of the first lens 01, the second lens 02 and the third lens 03 and reduce material waste.

[0060] Further, the lens satisfies the following relational expression: 2≤TTL / (AAG+BFL)≤3, wherein TTL is the distance from the object side surface of the first lens 01 to the imaging surface along the optical axis, AAG is the sum of air gaps between the first lens 01 and the tenth lens 10 along the optical axis, and BFL is the distance from the image side surface of the tenth lens 10 to the image plane along the optical axis.

[0061] The beneficial effects of this embodiment are: satisfying the above formula can more effectively shorten the system length and ensure imaging quality. Meanwhile, taking into account the difficulty of lens assembly, the formula enables the lens to have a better configuration.

[0062] Further, the lens satisfies the following relational expression: 0.5≤ fa / fb ≤ 1.0, where fa is the combined focal length of the first lens 01 to the sixth lens 06, and fb is the combined focal length of the seventh lens 07 to the tenth lens 10.

[0063] The beneficial effect of this embodiment is: satisfying the above formula is beneficial to improving the optical MTF performance of the lens, and can effectively reduce the aberration of the lens.

[0064] Further, the third lens 03 and the tenth lens 10 are glass aspheric lenses; the first lens 01, the second lens 02, the fourth lens 04, the fifth lens 05, the sixth lens 06, the seventh lens 07, the eighth lens 08 and the ninth lens 09 are all glass spherical lenses.

[0065] The beneficial effect of this embodiment is: the design adopting eight glass spherical lenses plus two glass aspheric lenses is beneficial to correcting secondary spectrum and high-order aberrations; meanwhile, by reasonably distributing the arrangement positions of the glass aspheric surfaces, the optical structure can be well optimized and the lens structure design is facilitated at the same time. The all-glass lens structural design can well correct the lens temperature drift, which can ensure that the lens has a good working state under different temperature conditions.

[0066] Detailed optical data of Examples 1 to 3 provided by the present invention are shown in Tables 1-1 to 1-3.

[0067] Detailed optical data of Table 1-1

[0068] Detailed optical data of Table 1-2

[0069] Detailed optical data of Table 1-3

[0070] In summary, the present invention has the following beneficial effects: 1. The optical TTL is less than 35mm, and the ten-piece design is adopted, so the overall volume of the lens is small, and it is convenient to install and use; 2. The combined focal length range of the lens is 4.0mm < EFL < 4.3mm, the field of view range is 99° ≤ DFOV ≤ 101°, the aperture Fno = 1.8, and the overall field of view of the lens is large.

[0071] Further analysis can be drawn on the data of the accompanying drawings of the specification as follows: Figure 2 It is an MTF curve diagram of the lens according to Embodiment 1 of the present invention under visible light of 435nm-650nm. It can be seen from the figure that at 60 lp / mm, the center MTF is greater than 0.8, and the edge MTF is greater than 0.4, the imaging quality is excellent, and the lens resolution is high.

[0072] Figure 3 This is a defocus curve diagram of the lens in Embodiment 1 of the present invention under visible light (435nm-650nm). The diagram shows that the defocus curves of the lens are relatively concentrated across different fields of view under visible light, indicating a small defocus amount.

[0073] Figure 4 This is an MTF curve of the lens in Embodiment 1 of the present invention under infrared light at 940nm. As can be seen from the figure, the MTF at 60lp / mm is greater than 0.7 at the center and greater than 0.4 at the edges, indicating excellent image quality and high lens resolution.

[0074] Figure 5 This is a defocus curve of the lens in Embodiment 1 of the present invention at 940nm visible light. As can be seen from the figure, the center defocus of the lens is within 10µm at 940nm in night vision, and the infrared defocus is small, indicating good imaging quality even under night vision conditions.

[0075] Figure 6 This is a lateral chromatic aberration curve of the lens in Embodiment 1 of the present invention under visible light (435nm-650nm). The figure shows that the lens chromatic aberration is within 10µm, exhibiting high color fidelity and good correction of blue-purple fringing under night vision confocal conditions.

[0076] Figure 7 This is a longitudinal chromatic aberration curve of the lens in Embodiment 1 of the present invention under visible light (435nm-650nm). The figure shows that the chromatic aberration along the lens axis is small, resulting in good color reproduction, minimal color difference, and minimal blue-violet fringing.

[0077] Figure 8 This image shows the field curvature and distortion of the lens in Embodiment 1 of the present invention in the visible light range of 435nm-650nm. As can be seen from the image, the lens exhibits good control over field curvature and distortion at various wavelengths, effectively improving image quality and facilitating subsequent image correction.

[0078] Figure 10 This is an MTF curve of the lens in Embodiment 2 of the present invention under visible light (435nm-650nm). As can be seen from the figure, the MTF at 60 lp / mm is greater than 0.8 at the center and greater than 0.4 at the edges, indicating excellent image quality and high lens resolution.

[0079] Figure 11 This is a defocus curve diagram of the lens in Embodiment 2 of the present invention under visible light (435nm-650nm). As can be seen from the diagram, the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0080] Figure 12This is an MTF curve of the lens in Embodiment 2 of the present invention under 940nm infrared light. As can be seen from the figure, the MTF at 60lp / mm is greater than 0.7 at the center and greater than 0.4 at the edges, indicating excellent image quality and high lens resolution.

[0081] Figure 13 This is a defocus curve of the lens in Embodiment 2 of the present invention at 940nm visible light. As can be seen from the figure, the center defocus of the lens is within 10µm at 940nm in night vision, and the infrared defocus is small, indicating good imaging quality even under night vision conditions.

[0082] Figure 14 This is a lateral chromatic aberration curve of the lens in Embodiment 2 of the present invention under visible light (435nm-650nm). The figure shows that the lens chromatic aberration is within 10µm, exhibiting high color fidelity and good correction of blue-purple fringing under night vision confocal conditions.

[0083] Figure 15 This is a longitudinal chromatic aberration curve of the lens in Embodiment 2 of the present invention under visible light (435nm-650nm). The figure shows that the chromatic aberration along the lens axis is small, resulting in good color reproduction, minimal color difference, and minimal blue-purple fringing.

[0084] Figure 16 This image shows the field curvature and distortion of the lens in Embodiment 2 of the present invention in the visible light range of 435nm-650nm. As can be seen from the image, the lens exhibits good control over field curvature and distortion at various wavelengths, effectively improving image quality and facilitating subsequent image correction.

[0085] Figure 18 The image shows the MTF curve of the lens in Embodiment 3 of the present invention under visible light (435nm-650nm). As can be seen from the figure, the MTF at 60 lp / mm is greater than 0.8 at the center and greater than 0.4 at the edges, indicating excellent image quality and high lens resolution.

[0086] Figure 19 This is a defocus curve diagram of the lens in Embodiment 3 of the present invention under visible light (435nm-650nm). As can be seen from the diagram, the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0087] Figure 20 This is an MTF curve of the lens in Embodiment 3 of the present invention under 940nm infrared light. As can be seen from the figure, the MTF at 60lp / mm is greater than 0.7 at the center and greater than 0.4 at the edges, indicating excellent image quality and high lens resolution.

[0088] Figure 21This is a defocus curve of the lens in Embodiment 3 of the present invention at 940nm visible light. As can be seen from the figure, the center defocus of the lens is within 10µm at 940nm in night vision, and the infrared defocus is small, indicating good imaging quality even under night vision conditions.

[0089] Figure 22 This is a lateral chromatic aberration curve of the lens in Embodiment 3 of the present invention under visible light (435nm-650nm). The figure shows that the lens chromatic aberration is within 10µm, exhibiting high color fidelity and good correction of blue-purple fringing under night vision confocal conditions.

[0090] Figure 23 This is a longitudinal chromatic aberration curve of the lens in Embodiment 3 of the present invention under visible light (435nm-650nm). The figure shows that the chromatic aberration along the lens axis is small, resulting in good color reproduction, minimal color difference, and minimal blue-purple fringing.

[0091] Figure 24 The figures show the field curvature and distortion of the lens in Embodiment 3 of this invention in the visible light range of 435nm-650nm. As can be seen from the figures, the lens exhibits good control over field curvature and distortion at various wavelengths, effectively improving image quality and facilitating subsequent image correction.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side. The total number of lenses with optical power in the lens is ten, wherein: The object-side surface of the first lens is convex, the image-side surface of the first lens is concave, and the first lens has negative optical power. The object-side surface of the second lens is convex, the image-side surface of the second lens is concave, and the second lens has negative optical power. The object-side surface of the third lens is convex, the image-side surface of the third lens is concave, and the third lens has negative optical power. The object side of the fourth lens is convex, the image side of the fourth lens is convex, and the fourth lens has positive optical power. The object-side surface of the fifth lens is concave, the image-side surface of the fifth lens is concave, and the fifth lens has negative optical power. The object-side surface of the sixth lens is convex, the image-side surface of the sixth lens is convex, and the sixth lens has positive optical power. The object-side surface of the seventh lens is convex, the image-side surface of the seventh lens is convex, and the seventh lens has positive or negative optical power. The object side of the eighth lens is concave, the image side of the eighth lens is convex, and the seventh lens has positive or negative optical power. The object-side surface of the ninth lens is concave, the image-side surface of the ninth lens is concave, and the ninth lens has negative optical power. The object side of the tenth lens is convex, the image side of the tenth lens is convex, and the tenth lens has positive optical power. The lens satisfies the following relationship: 0.5 ≤ fa / fb ≤1.0, where fa is the combined focal length of the first lens to the sixth lens, and fb is the combined focal length of the seventh lens to the tenth lens.

2. The optical imaging lens according to claim 1, characterized in that: absolute value of the focal length of the first lens The following relationship must be satisfied: 22mm≤ ≤42mm; absolute value of the focal length of the second lens The following relationship must be satisfied: 20 mm ≤ ≤30 mm; The absolute value of the focal length of the third lens The following relationship must be satisfied: 9 mm ≤ ≤13 mm; The absolute value of the focal length of the fourth lens The following relationship must be satisfied: 8 mm ≤ ≤10 mm; The absolute value of the focal length of the fifth lens The following relationship must be satisfied: 20 mm ≤ ≤200 mm; The absolute value of the focal length of the sixth lens The following relationship must be satisfied: 8 mm ≤ ≤10mm; The absolute value of the focal length of the seventh lens The following relationship must be satisfied: 30 mm ≤ ≤110 mm; The absolute value of the focal length of the eighth lens The following relationship must be satisfied: 20 mm ≤ ≤350 mm; The absolute value of the focal length of the ninth lens The following relationship must be satisfied: 5mm≤ ≤10 mm; The absolute value of the focal length of the tenth lens The following relationship must be satisfied: 5mm≤ ≤10 mm.

3. An optical imaging lens according to claim 1 or 2, characterized in that: The focal length of the first lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤10; The focal length of the second lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 5 ≤ / F ≤8; The focal length of the third lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fourth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤3; The focal length of the fifth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤40; The focal length of the sixth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 2 ≤ / F ≤2.5; The focal length of the seventh lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 8 ≤ / F ≤30; The focal length of the eighth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 6 ≤ / F ≤85; The focal length of the ninth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2; The focal length of the tenth lens The absolute value of the ratio to the overall focal length F of the lens satisfies the following relationship: 1 ≤ / F ≤2.

4. An optical imaging lens according to claim 1 or 2, characterized in that: The lens satisfies the following relationship: 0.4≤f / IMH≤0.5, where f is the effective focal length of the lens and IMH is the effective image plane size of the lens.

5. An optical imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: 1≤ / ≤2, where, CT1 is the combined focal length of the first lens, the second lens, and the third lens; CT2 is the center thickness of the first lens on the optical axis; CT3 is the center thickness of the second lens on the optical axis; and CT4 is the center thickness of the third lens on the optical axis.

6. An optical imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: 2≤TTL / (AAG+BFL)≤3, where TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, AAG is the sum of the air gaps between the first lens and the tenth lens on the optical axis, and BFL is the distance from the image side of the tenth lens to the image plane on the optical axis.

7. An optical imaging lens according to claim 1, characterized in that: The third lens and the tenth lens are aspherical glass lenses; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all spherical glass lenses.

8. An optical imaging lens according to claim 1, characterized in that: An aperture stop is provided between the sixth lens and the seventh lens.

9. An optical imaging lens according to claim 1, characterized in that: The fifth and sixth lenses are cemented lenses; the seventh and eighth lenses are cemented lenses.

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