An optical imaging lens

Abstract

This invention provides an optical imaging lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has a convex object side and a concave image side, and possesses negative optical power. The second lens has either positive or negative optical power. The third lens has positive optical power. The fourth lens has positive optical power. The fifth lens has either positive or negative optical power. The sixth lens has either positive or negative optical power. By rationally allocating the optical power of each lens and optimizing the surface shape, thickness, and inter-lens distance, the lens achieves excellent image quality. The six-element design reduces the number of lenses, resulting in a simple structure, compact size, easy installation and use, and cost savings.

Description

Technical Field

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

[0002] Most existing optical imaging lenses have one or more of the following defects: First, the total length (TTL) of the optical system is too large and there are too many lenses, which makes the overall cost and weight of the lens too high and limits its installation and use; Second, the image quality of the lens is poor and cannot meet the requirements of high-definition imaging; Third, the image plane and field of view are small, which makes the image capture range of the lens small and the image quality poor. 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, by adopting a six-element lens architecture and by rationally allocating the optical power of each lens element, optimizing the surface shape, thickness and distance between each lens element, can enable the lens to have good image quality, thereby solving the problems mentioned in the background section above.

[0004] This invention is achieved through the following technical solution:

[0005] An optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein:

[0006] 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.

[0007] The second lens has positive or negative optical power;

[0008] The third lens has positive optical power;

[0009] The fourth lens has positive optical power;

[0010] The fifth lens has positive or negative optical power;

[0011] The sixth lens has either positive or negative optical power.

[0012] The beneficial effects of this embodiment are as follows: by reasonably allocating the optical power of each lens, optimizing the surface shape, thickness and distance between each lens, the lens has good imaging quality. It adopts a six-element design, with fewer lenses, simple structure, small and compact size, convenient installation and use, and can save lens costs.

[0013] Furthermore,

[0014] The absolute value of the focal length |F1| of the first lens satisfies the following relationship: 3mm≤|F1|≤11mm;

[0015] The absolute value of the focal length |F2| of the second lens satisfies the following relationship: 4mm≤|F2|≤26mm;

[0016] The absolute value of the focal length |F3| of the third lens satisfies the following relationship: 5mm≤|F3|≤24mm;

[0017] The absolute value of the focal length |F4| of the fourth lens satisfies the following relationship: 2mm≤|F4|≤6mm;

[0018] The absolute value of the focal length |F5| of the fifth lens satisfies the following relationship: 2mm≤|F4|≤6mm;

[0019] The absolute value of the focal length |F6| of the sixth lens satisfies the following relationship: 4.5mm≤|F6|≤8mm.

[0020] The beneficial effect of this embodiment is that by reasonably allocating the optical power of each lens, the aberrations of the lens can be effectively balanced and controlled, so that the optical system can obtain better imaging quality.

[0021] Furthermore,

[0022] The absolute value of the ratio of the focal length F1 of the first lens to the overall focal length F of the lens satisfies the following relationship: 1≤|F1 / F|≤5;

[0023] The absolute value of the ratio of the focal length F2 of the second lens to the overall focal length F of the lens satisfies the following relationship: 1.5≤|F2 / F|≤10;

[0024] The absolute value of the ratio of the focal length F3 of the third lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F3 / F|≤9.5;

[0025] The absolute value of the ratio of the focal length F4 of the fourth lens to the overall focal length F of the lens satisfies the following relationship: 1≤|F4 / F|≤2.5;

[0026] The absolute value of the ratio of the focal length F5 of the fifth lens to the overall focal length F of the lens satisfies the following relationship: 1≤|F4 / F|≤2.5;

[0027] The absolute value of the ratio of the focal length F6 of the sixth lens to the overall focal length F of the lens satisfies the following relationship: 2≤|F6 / F|≤3.

[0028] The beneficial effect of this embodiment is that by rationally allocating the optical power of each lens in the system, the imaging performance of the optical system is improved.

[0029] Furthermore, the lens satisfies the following relationship: 0.7≤(R1+R2) / (R1-R2)≤1.1, where R1 is the radius of curvature of the first lens near the object side and R2 is the radius of curvature of the first lens near the image side.

[0030] The beneficial effects of this embodiment are: a lens that satisfies the above formula can have a better field of view and can reduce higher-order aberrations of the imaging system.

[0031] Furthermore, the lens satisfies the following relationship: 100≤(V4+V5+V6)≤140, where V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, and V6 is the Abbe number of the sixth lens.

[0032] The beneficial effect of this embodiment is that a lens that satisfies the above formula can more effectively reduce chromatic aberration, resulting in better color reproduction.

[0033] Furthermore, the lens satisfies the following relationship: 1.5≤ALT / AAG≤3.5, where ALT is the sum of the center thicknesses of the first to sixth lenses on the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses on the optical axis.

[0034] The beneficial effects of this embodiment are: satisfying the above formula can better allocate the optical power between individual lenses, so that the lens has better image quality. At the same time, it can also effectively compress the overall length of the lens, which is more conducive to the assembly of the rear lens module.

[0035] Furthermore, the combined focal length of the first to sixth lenses is 2.3mm≤EFL≤2.7mm, the field of view FOV=140°, the light transmission is 2.25≤F#≤2.35, and the total system length TTL≤15.0mm.

[0036] The beneficial effects of this embodiment are: satisfying the above formula can make the overall imaging field of view of the lens large, the structure compact, and the practicality strong.

[0037] Furthermore, the lens satisfies the following relationship: the lens MTF from the center to the edge can reach 120lp / mm > 0.5.

[0038] The beneficial effects of this embodiment are: satisfying the above formula can greatly improve the imaging quality of the lens, meet the requirements of high-definition imaging, and improve practicality.

[0039] Furthermore, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens are all spherical glass lenses, and the fourth lens is an aspherical glass lens.

[0040] The beneficial effects of this embodiment are as follows: the all-glass lens structure design can effectively correct lens temperature drift and ensure its working condition under different temperature conditions; the design of five glass spherical lenses plus one glass aspherical lens, with the fourth lens being a glass aspherical lens, is beneficial for correcting secondary spectral and higher-order aberrations; at the same time, the reasonable allocation of the glass aspherical lens positions can optimize the optical structure and facilitate lens structure design, which is more conducive to lens miniaturization.

[0041] Furthermore, an aperture stop is provided between the third lens and the fourth lens. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the optical path in Embodiment 1 of the present invention.

[0043] Figure 2 The image shows the MTF curve of the lens in Example 1 under visible light (435nm-650nm).

[0044] Figure 3 This is a defocus curve of the lens in Example 1 under visible light 435nm-650nm.

[0045] Figure 4 This is a lateral chromatic aberration curve of the lens in Example 1 under visible light 435nm-650nm.

[0046] Figure 5 This is a longitudinal chromatic difference curve of the lens in Example 1 under visible light 435nm-650nm.

[0047] Figure 6 The image shows the field curvature and distortion of the lens in Example 1 under visible light (435nm-650nm).

[0048] Figure 7 This is a schematic diagram of the optical path in Embodiment 2 of the present invention.

[0049] Figure 8 The image shows the MTF curve of the lens in Example 2 under visible light (435nm-650nm).

[0050] Figure 9 This is a defocus curve of the lens in Example 2 under visible light 435nm-650nm.

[0051] Figure 10 This is a lateral chromatic aberration curve of the lens in Example 2 under visible light 435nm-650nm.

[0052] Figure 11 This is a longitudinal chromatic difference curve of the lens in Example 2 under visible light 435nm-650nm.

[0053] Figure 12 The image shows the field curvature and distortion of the lens in Example 2 under visible light (435nm-650nm).

[0054] Figure 13 This is a schematic diagram of the optical path in Embodiment 3 of the present invention.

[0055] Figure 14 The image shows the MTF curve of the lens in Example 3 under visible light (435nm-650nm).

[0056] Figure 15 This is a defocus curve of the lens in Example 3 under visible light 435nm-650nm.

[0057] Figure 16 This is a lateral chromatic aberration curve of the lens in Example 3 under visible light 435nm-650nm.

[0058] Figure 17 This is a longitudinal chromatic difference curve of the lens in Example 3 under visible light 435nm-650nm.

[0059] Figure 18 The image shows the field curvature and distortion of the lens in Example 3 under visible light (435nm-650nm).

[0060] The above figures include the following reference numerals:

[0061] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Aperture stop; 8. Filter. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] Reference Figures 1 to 18 As shown, an optical imaging lens includes a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged sequentially along the optical axis from the object side to the image side. A filter 8 is provided after the sixth lens 6. The first to third lenses 3 form the front group of the lens, and the fourth to sixth lenses 6 form the rear group of the lens.

[0065] The object-side surface of the first lens 1 is convex, the image-side surface of the first lens 1 is concave, and the first lens 1 has negative optical power.

[0066] The second lens 2 has positive or negative optical power;

[0067] The second lens 3 has positive optical power;

[0068] The fourth lens 4 has positive optical power;

[0069] The fifth lens 5 has positive or negative optical power;

[0070] The sixth lens 6 has either positive or negative optical power.

[0071] The beneficial effects of this embodiment are as follows: by rationally allocating the optical power of each lens, optimizing the surface shape, thickness, and distance between each lens, the lens achieves excellent image quality. The six-element design reduces the number of lenses, resulting in a simple structure, compact size, easy installation and use, and cost savings. This invention, by adjusting the distance between different lenses and the radius of curvature of each lens, can effectively provide a large field of view, reduce size, correct aberrations, and obtain better image quality.

[0072] Furthermore,

[0073] The absolute value of the focal length |F1| of the first lens 1 satisfies the following relationship: 3mm≤|F1|≤11mm;

[0074] The absolute value of the focal length |F2| of the second lens 2 satisfies the following relationship: 4mm≤|F2|≤26mm;

[0075] The absolute value of the focal length |F3| of the second lens 3 satisfies the following relationship: 5mm≤|F3|≤24mm;

[0076] The absolute value of the focal length |F4| of the fourth lens 4 satisfies the following relationship: 2mm≤|F4|≤6mm;

[0077] The absolute value of the focal length |F5| of the fifth lens 5 satisfies the following relationship: 2mm≤|F4|≤6mm;

[0078] The absolute value of the focal length |F6| of the sixth lens 6 satisfies the following relationship: 4.5mm≤|F6|≤8mm.

[0079] The beneficial effect of this embodiment is that by reasonably allocating the optical power of each lens, the aberrations of the lens can be effectively balanced and controlled, so that the optical system can obtain better imaging quality.

[0080] Furthermore,

[0081] The absolute value of the ratio of the focal length F1 of the first lens 1 to the overall focal length F of the lens satisfies the following relationship: 1≤|F1 / F|≤5;

[0082] The absolute value of the ratio of the focal length F2 of the second lens 2 to the overall focal length F of the lens satisfies the following relationship: 1.5≤|F2 / F|≤10;

[0083] The absolute value of the ratio of the focal length F3 of the second lens 3 to the overall focal length F of the lens satisfies the following relationship: 2≤|F3 / F|≤9.5;

[0084] The absolute value of the ratio of the focal length F4 of the fourth lens 4 to the overall focal length F of the lens satisfies the following relationship: 1≤|F4 / F|≤2.5;

[0085] The absolute value of the ratio of the focal length F5 of the fifth lens 5 to the overall focal length F of the lens satisfies the following relationship: 1≤|F4 / F|≤2.5;

[0086] The absolute value of the ratio of the focal length F6 of the sixth lens 6 to the overall focal length F of the lens satisfies the following relationship: 2≤|F6 / F|≤3.

[0087] The beneficial effect of this embodiment is that by rationally allocating the optical power of each lens in the system, the imaging performance of the optical system is improved.

[0088] Furthermore, the lens satisfies the following relationship: 0.7≤(R1+R2) / (R1-R2)≤1.1, where R1 is the radius of curvature of the first lens 1 near the object side and R2 is the radius of curvature of the first lens 1 near the image side.

[0089] The beneficial effects of this embodiment are: a lens that satisfies the above formula can have a better field of view and can reduce higher-order aberrations of the imaging system.

[0090] Furthermore, the lens satisfies the following relationship: 100≤(V4+V5+V6)≤140, where V4 is the Abbe number of the fourth lens 4, V5 is the Abbe number of the fifth lens 5, and V6 is the Abbe number of the sixth lens 6.

[0091] The beneficial effect of this embodiment is that a lens that satisfies the above formula can more effectively reduce chromatic aberration, resulting in better color reproduction.

[0092] Furthermore, the lens satisfies the following relationship: 1.5≤ALT / AAG≤3.5, where ALT is the sum of the center thicknesses of the first to sixth lenses 6 on the optical axis, and AAG is the sum of the air gaps of the first to sixth lenses 6 on the optical axis.

[0093] The beneficial effects of this embodiment are: satisfying the above formula can better allocate the optical power between individual lenses, so that the lens has better image quality. At the same time, it can also effectively compress the overall length of the lens, which is more conducive to the assembly of the rear lens module.

[0094] Furthermore, the combined focal length of the first to sixth lenses 6 is 2.3mm≤EFL≤2.7mm, the field of view FOV=140°, the light transmission is 2.25≤F#≤2.35, and the total system length TTL≤15.0mm.

[0095] The beneficial effects of this embodiment are: satisfying the above formula can make the overall imaging field of view of the lens large, the structure compact, and the practicality strong.

[0096] Furthermore, the lens satisfies the following relationship: the lens MTF from the center to the edge can reach 120lp / mm > 0.5.

[0097] The beneficial effects of this embodiment are: satisfying the above formula can greatly improve the imaging quality of the lens, meet the requirements of high-definition imaging, and improve practicality.

[0098] Furthermore, the first lens 1, the second lens 2, the second lens 3, the fifth lens 5, and the sixth lens 6 are all spherical glass lenses, and the fourth lens 4 is an aspherical glass lens.

[0099] The beneficial effects of this embodiment are as follows: the all-glass lens structure design can effectively correct lens temperature drift and ensure its working condition under different temperature conditions; the design of five glass spherical lenses plus one glass aspherical lens, with the fourth lens 4 using a glass aspherical lens, is beneficial for correcting secondary spectral and higher-order aberrations; at the same time, the reasonable allocation of the glass aspherical lens positions can optimize the optical structure and facilitate lens structure design, which is more conducive to lens miniaturization.

[0100] The present invention provides detailed optical data for embodiments one to three, as shown in Tables 1-1 to 1-3.

[0101] The conditional expressions for Examples 1 to 3 are as follows:

[0102] Conditional expression Example 1 Example 2 Example 3 F 2.622 2.364 2.548 FOV 140° 140° 140° TTL 15 11 15 1.5<ALT / AAG<3.5 3.395 1.653 2.428 IMH 5.000 5.000 5.000 0.7 < (R1 + R2) / (R1 - R3) < 1.1 0.777 1.029 0.954 100 < (V4 + V5 + V6) < 140 136.205 107.528 123.392

[0103] Detailed optical data in Table 1-1

[0104]

[0105] Detailed optical data in Table 1-2

[0106]

[0107] Detailed optical data in Table 1-3

[0108]

[0109] Figure 2 The image shows the MTF curve of the lens in Example 1 under visible light (435nm-650nm). As can be seen from the figure, the MTF at 120 lp / mm is greater than 0.7 at the center and greater than 0.5 at the edges, indicating excellent image quality and high lens resolution.

[0110] Figure 3 The figure shows the defocus curves of the lens in Example 1 under visible light (435nm-650nm). It can be seen from the figure that the defocus curves of the lens are relatively concentrated across different fields of view under visible light, indicating a small defocus amount.

[0111] Figure 4 The figure shows the lateral chromatic aberration curve of the lens in Example 1 under visible light (435nm-650nm). As can be seen from the figure, the lens chromatic aberration is within 6µm, exhibiting high color fidelity and good correction of blue-purple fringing under night vision confocal conditions.

[0112] Figure 5 This is a longitudinal chromatic aberration curve of the lens in Example 1 under visible light (435nm-650nm). The graph shows that the lens exhibits small chromatic aberration along its axis, resulting in good color reproduction, minimal color difference, and minimal blue-violet fringing.

[0113] Figure 6 The image shows the field curvature and distortion of the lens in Example 1 within 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.

[0114] Figure 8 The image shows the MTF curve of the lens in Example 2 under visible light (435nm-650nm). As can be seen from the figure, the MTF at 120 lp / mm is greater than 0.7 at the center and greater than 0.5 at the edges, indicating excellent image quality and high lens resolution.

[0115] Figure 9The figure shows the defocus curves of the lens in Example 2 under visible light (435nm-650nm). It can be seen from the figure that the defocus curves of the lens are relatively concentrated across different fields of view under visible light, indicating a small defocus amount.

[0116] Figure 10 This is a lateral chromatic aberration curve of the lens in Example 2 under visible light (435nm-650nm). The figure shows that the lens chromatic aberration is within 5µm, exhibiting high color fidelity and good correction of blue-purple fringing under night vision confocal conditions.

[0117] Figure 11 This is a longitudinal chromatic aberration curve of the lens in Example 2 under visible light (435nm-650nm). The graph shows that the lens exhibits small chromatic aberration along its axis, resulting in good color reproduction, minimal color difference, and minimal blue-purple fringing.

[0118] Figure 12 The image shows the field curvature and distortion of the lens in Example 2 within 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.

[0119] Figure 14 The image shows the MTF curve of the lens in Example 3 under visible light (435nm-650nm). As can be seen from the figure, the MTF at 120 lp / mm is greater than 0.7 at the center and greater than 0.5 at the edges, indicating excellent image quality and high lens resolution.

[0120] Figure 15 The figure shows the defocus curves of the lens in Example 3 under visible light (435nm-650nm). It can be seen from the figure that the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0121] Figure 16 This is a lateral chromatic aberration curve of the lens in Example 3 under visible light (435nm-650nm). The figure shows that the lens chromatic aberration is within 6µm, exhibiting high color fidelity and good correction of blue-purple fringing under confocal night vision conditions.

[0122] Figure 17 This is a longitudinal chromatic aberration curve of the lens in Example 3 under visible light (435nm-650nm). The graph shows that the lens exhibits small chromatic aberration along its axis, resulting in good color reproduction, minimal color difference, and minimal blue-purple fringing.

[0123] Figure 18 The image shows the field curvature and distortion of the lens in Example 3 within 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.

[0124] 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: It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, 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 second lens has negative optical power; the third lens has positive optical power; the fourth lens has positive optical power; the fifth lens has positive optical power; and the sixth lens has negative optical power. absolute value of the focal length of the first lens The following relationship must be satisfied: 3mm≤ ≤11mm; absolute value of the focal length of the second lens The following relationship must be satisfied: 4mm≤ ≤26mm; The absolute value of the focal length of the third lens The following relationship must be satisfied: 5mm≤ ≤24mm; The absolute value of the focal length of the fourth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the fifth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the sixth lens The following relationship must be satisfied: 4.5mm ≤ ≤8mm; 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: 1 ≤ / F ≤5; 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: 1.5 ≤ / F ≤10; 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 ≤9.5; 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: 1 ≤ / F ≤2.5; 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: 1 ≤ / F ≤2.5; 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 ≤3; The lens satisfies the following relationship: the combined focal length of the first to sixth lenses is 2.3mm ≤ EFL ≤ 2.7mm, the field of view (FOV) is 140°, the light transmission is 2.25 ≤ F# ≤ 2.35, and the total system length (TTL) is ≤ 15.0mm.

2. An optical imaging lens, characterized in that: It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, 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 second lens has negative optical power; the third lens has positive optical power; the fourth lens has positive optical power; the fifth lens has negative optical power; and the sixth lens has positive optical power. absolute value of the focal length of the first lens The following relationship must be satisfied: 3mm≤ ≤11mm; absolute value of the focal length of the second lens The following relationship must be satisfied: 4mm≤ ≤26mm; The absolute value of the focal length of the third lens The following relationship must be satisfied: 5mm≤ ≤24mm; The absolute value of the focal length of the fourth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the fifth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the sixth lens The following relationship must be satisfied: 4.5mm ≤ ≤8mm; 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: 1 ≤ / F ≤5; 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: 1.5 ≤ / F ≤10; 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 ≤9.5; 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: 1 ≤ / F ≤2.5; 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: 1 ≤ / F ≤2.5; 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 ≤3; The lens satisfies the following relationship: the combined focal length of the first to sixth lenses is 2.3mm ≤ EFL ≤ 2.7mm, the field of view (FOV) is 140°, the light transmission is 2.25 ≤ F# ≤ 2.35, and the total system length (TTL) is ≤ 15.0mm.

3. An optical imaging lens, characterized in that: It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, 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 second lens has positive optical power; the third lens has positive optical power; the fourth lens has positive optical power; the fifth lens has negative optical power; and the sixth lens has positive optical power. absolute value of the focal length of the first lens The following relationship must be satisfied: 3mm≤ ≤11mm; absolute value of the focal length of the second lens The following relationship must be satisfied: 4mm≤ ≤26mm; The absolute value of the focal length of the third lens The following relationship must be satisfied: 5mm≤ ≤24mm; The absolute value of the focal length of the fourth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the fifth lens The following relationship must be satisfied: 2mm≤ ≤6mm; The absolute value of the focal length of the sixth lens The following relationship must be satisfied: 4.5mm ≤ ≤8mm; 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: 1 ≤ / F ≤5; 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: 1.5 ≤ / F ≤10; 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 ≤9.5; 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: 1 ≤ / F ≤2.5; 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: 1 ≤ / F ≤2.5; 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 ≤3; The lens satisfies the following relationship: the combined focal length of the first to sixth lenses is 2.3mm ≤ EFL ≤ 2.7mm, the field of view (FOV) is 140°, the light transmission is 2.25 ≤ F# ≤ 2.35, and the total system length (TTL) is ≤ 15.0mm.

4. An optical imaging lens according to any one of claims 1 to 3, characterized in that: The lens satisfies the following relationship: 0.7≤(R1+R2) / (R1-R2)≤1.1, where R1 is the radius of curvature of the first lens near the object side and R2 is the radius of curvature of the first lens near the image side.

5. An optical imaging lens according to any one of claims 1 to 3, characterized in that: The lens satisfies the following relationship: 100≤(V4+V5+V6)≤140, where V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, and V6 is the Abbe number of the sixth lens.

6. An optical imaging lens according to any one of claims 1 to 3, characterized in that: The lens satisfies the following relationship: 1.5≤ALT / AAG≤3.5, where ALT is the total center thickness of the first to sixth lenses on the optical axis, and AAG is the total air gap of the first to sixth lenses on the optical axis.

7. An optical imaging lens according to any one of claims 1 to 3, characterized in that: The lens satisfies the following relationship: The MTF of the lens from the center to the edge can reach 120lp / mm > 0.

5.

8. An optical imaging lens according to any one of claims 1 to 3, characterized in that: The first lens, the second lens, the third lens, the fifth lens, and the sixth lens are all spherical glass lenses, and the fourth lens is an aspherical glass lens.

9. An optical imaging lens according to any one of claims 1 to 3, characterized in that: An aperture stop is provided between the third lens and the fourth lens.

Images