Optical lens, camera module and terminal device

Abstract

The application discloses an optical lens, a camera module and a terminal device. The optical lens comprises a first lens with a negative refractive power, a second lens, a third lens with a positive refractive power, a fourth lens, a fifth lens and a sixth lens with a positive refractive power. The object side of the first lens is a convex surface at a near optical axis, and the image side is a concave surface at the near optical axis. The object side of the second lens is a concave surface at the near optical axis, and the image side is a convex surface at the near optical axis. The object side of the third lens is a convex surface at the near optical axis, and the image side is a convex surface at the near optical axis. The object side of the sixth lens is a convex surface at the near optical axis. The optical lens also satisfies the relationship: 170°≤FOV≤200°, 6.6≤TTL / F≤6.8. The optical lens can obtain an ultra-wide field of view angle range, and can also meet the requirements of small size and high image quality.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an optical lens, camera module and terminal device. Background Technology

[0002] With the gradual improvement of intelligent driving, in-vehicle cameras, as the "eyes of autonomous driving," are core sensor devices. The development of in-vehicle cameras has gradually expanded from early applications such as driving recording, reversing images, and parking surround view to behavior recognition and ADAS (Advanced Driver Assistance System) assistance within intelligent cockpits.

[0003] As an extension of the Driver Monitoring System (DMS), the Occupant Monitoring System (OMS) can not only monitor the driver's condition and alert them to dangerous behaviors such as driver fatigue, smoking, and phone use, but also monitor the behavior of other passengers, including whether children are left in the vehicle or any items left behind. However, existing in-cabin cameras suffer from a narrow field of view and low image quality, making them inadequate for monitoring the condition of both the driver and passengers. Summary of the Invention

[0004] This application provides an optical lens, a camera module, and a terminal device that can solve the problem of small field of view of vehicle-mounted cameras.

[0005] In a first aspect, embodiments of this application provide an optical lens comprising six lenses with refractive power, including 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 negative refractive power, and the object side of the first lens is convex near the optical axis and the image side is concave near the optical axis. The second lens has refractive power, and the object side of the second lens is concave near the optical axis, while the image side is convex near the optical axis. The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis, and the image side is convex near the optical axis. Both the fourth lens and the fifth lens have refractive power; The sixth lens has positive refractive power, and the object side of the sixth lens is convex near the optical axis; The optical lens satisfies the following relationships: 170°≤FOV≤200°, 6.6≤TTL / F≤6.8, where FOV is the maximum field of view of the optical lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, and F is the effective focal length of the optical lens.

[0006] Based on the optical lens provided in this application embodiment, by limiting the surface shape and refractive power of the six lenses of the optical lens, and selecting the optical lens to satisfy the conditions 170°≤FOV≤200° and 6.6≤TTL / F≤6.8, the optical lens can obtain an ultra-wide field of view range to capture a large target area. At the same time, the total optical length and effective focal length of the optical lens are balanced, and the total optical length of the optical lens is compressed while ensuring the shooting quality of the optical lens, so that the optical lens can take into account the characteristics of small size.

[0007] Secondly, embodiments of this application provide a camera module, the camera module including a photosensitive element and an optical lens as described above, the photosensitive element being disposed on the image side of the optical lens.

[0008] Based on the camera module provided in the embodiments of this application, by selecting the optical lens as described above, the camera module can also obtain a large field of view. Furthermore, with the optical lens being small in size, the camera module can also achieve a small volume, thus making it suitable for installation in small spaces.

[0009] Thirdly, embodiments of this application provide a terminal device, the terminal device including a housing and a camera module as described above, the camera module being disposed in the housing.

[0010] Based on the terminal device provided in the embodiments of this application, by selecting the camera module as described above, the terminal device can obtain information about a large target area. The camera module is small in size and can also prevent the camera module from hindering the use of the terminal device or the installation of other structures of the terminal device. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the optical lens structure of Embodiment 1 of this application; Figure 2The diagrams show the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in Embodiment 1 of this application. Figure 3 This is a schematic diagram of the optical lens structure of Embodiment 2 of this application; Figure 4 The diagrams show the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in Embodiment 2 of this application. Figure 5 This is a schematic diagram of the optical lens structure of Embodiment 3 of this application; Figure 6 The diagrams show the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in Embodiment 3 of this application. Figure 7 This is a schematic diagram of the optical lens structure of Embodiment 4 of this application; Figure 8 The diagrams show the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in Embodiment 4 of this application. Figure 9 This is a schematic diagram of the optical lens structure of Embodiment 5 of this application; Figure 10 The diagrams show the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in Embodiment 5 of this application. Figure 11 This is a schematic diagram of the structure of a camera module according to one embodiment of this application; Figure 12 This is a schematic diagram of the structure of a car as the terminal device in one embodiment of this application; Figure label: 100. Optical lens; L1. First lens; L2. Second lens; L3. Third lens; L4. Fourth lens; L5. Fifth lens; L6. Sixth lens; IR. Filter; CG. Protective glass; IMG. Imaging plane; H. Optical axis; ST. Aperture stop; 10. Terminal equipment; 20. Camera module; 200. Photosensitive element; 201. Light-receiving surface. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0014] Please see Figure 1This is a schematic diagram of the structure of an optical lens 100 provided in one embodiment of this application. The optical lens 100 contains multiple lenses, all coaxially arranged, meaning the optical axes H of each lens are on the same straight line, which can be referred to as the optical axis H of the optical lens 100. The optical lens 100 has six lenses with refractive power. Specifically, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis H from the object side to the image side. The imaging surface IMG of the optical lens 100 is located on the side where the image side of the sixth lens L6 is located. When the optical lens 100 is used for imaging, light rays from the object side pass sequentially through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 before being projected into the imaging surface IMG. The imaging surface IMG can be used to set up a photosensitive element. The light rays that pass through the sixth lens L6 can be received by the photosensitive element in the imaging surface IMG and converted into an image signal. The photosensitive element then transmits the image signal to other back-end systems for image analysis and other processing.

[0015] The first lens L1 has negative refractive power. The object-side surface S1 of the first lens L1 is convex near the optical axis H, and the image-side surface S2 of the first lens L1 is concave near the optical axis H. By matching the refractive power and surface shape of the first lens L1, it is easier for the first lens to receive a wide range of object-side light rays, thereby obtaining an ultra-wide-angle field of view. When large-angle light rays pass through the first lens L1, the first lens L1 bends the principal rays of the off-axis field of view, making their angle relative to the optical axis H smaller, so as to reduce the size of subsequent lenses.

[0016] The second lens L2 has positive or negative refractive power. The object-side surface S3 of the second lens L2 is concave near the optical axis H, and the image-side surface S4 of the second lens L2 is convex near the optical axis H. By matching the surface shape of the second lens L2 with that of the first lens L1, the second lens L2 adjusts the light rays from the first lens L1, making the off-axis light rays relatively smooth, thus allowing the light rays to transition smoothly to the rear lens. Furthermore, in this embodiment, at least one of the object-side surface S3 and the image-side surface S4 of the second lens L2 can be an aspherical surface, using the aspherical surface to correct off-axis point aberrations.

[0017] The third lens L3 has positive refractive power. The object-side surface S5 of the third lens L3 is convex near the optical axis H, and the image-side surface S6 of the third lens L3 is convex near the optical axis H. The third lens L3 is located in the middle of the lens and converges the light rays so that the light rays pass smoothly through the third lens L3 and are projected onto the rear lens group, which facilitates the correction of field curvature and astigmatism and improves the clarity and quality of the image.

[0018] The fourth lens L4 has positive or negative refractive power. The object side S7 of the fourth lens L4 is convex or concave near the optical axis H, and the image side S8 of the fourth lens L4 is convex or concave near the optical axis H.

[0019] The fifth lens L5 has positive or negative refractive power. The object side S9 of the fifth lens L5 is convex or concave near the optical axis H, and the image side S10 of the fifth lens L5 is convex or concave near the optical axis H.

[0020] The image-side surface S8 of the fourth lens L4 is connected to the object-side surface S9 of the fifth lens L5 to form a cemented lens group, which can adjust chromatic aberration, making the chromatic aberration compensation of the front and rear lens groups more balanced and improving image quality. At least one of the object-side surface S7 and image-side surface S8 of the fourth lens L4, and the object-side surface S9 and image-side surface S10 of the fifth lens L5, can be made aspherical to compensate for aberrations.

[0021] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S12 of the sixth lens L6 is either convex or concave near the optical axis H. The sixth lens L6 converges light rays and balances various aberrations generated by the front lens group. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 can be an aspherical surface. The aspherical surface is used to further balance aberrations and improve image quality.

[0022] In some embodiments, the optical lens 100 satisfies the relationship: 170° ≤ FOV ≤ 200°. For example, FOV can be 170°, 185°, 189°, 192°, 196°, 200°, etc., where FOV is the maximum field of view of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, the optical lens 100 can obtain an ultra-wide field of view range, enabling it to capture images of a large target area.

[0023] In some embodiments, the optical lens 100 satisfies the relationship: 6.6 ≤ TTL / F ≤ 6.8. For example, TTL / F can be 6.60, 6.63, 6.67, 6.70, 6.75, 6.80, etc., where TTL is the distance on the optical axis H from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, i.e., the total optical length of the optical lens 100, and F is the effective focal length of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, the total optical length and effective focal length of the optical lens 100 are balanced. While ensuring the image quality of the optical lens 100, the total optical length of the optical lens 100 is compressed, allowing the optical lens 100 to also take into account its small size characteristics.

[0024] In some embodiments, the optical lens 100 satisfies the relationship: 0.72 ≤ F / IMGH ≤ 0.81. For example, F / IMGH can be 0.72, 0.75, 0.77, 0.79, 0.80, 0.81, etc., where F is the effective focal length of the optical lens 100, and IMGH is half the image height corresponding to the maximum field of view of the optical lens 100, i.e., half-image height. By selecting an optical lens 100 that satisfies the above condition, the effective focal length and half-image height of the optical lens 100 are matched, enabling the optical lens 100 to cooperate with a higher pixel image sensor to achieve high-definition imaging.

[0025] In some embodiments, the optical lens 100 satisfies the relationship: 4.8 ≤ TTL / IMGH ≤ 5.4. For example, TTL / IMGH can be 4.80, 4.96, 5.04, 5.13, 5.26, 5.40, etc., where TTL is the distance on the optical axis H from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, i.e., the total optical length of the optical lens 100, and IMGH is half the image height corresponding to the maximum field of view of the optical lens 100, i.e., the half-image height. By selecting the optical lens 100 to satisfy the above condition, the ratio of the total optical length and the half-image height of the optical lens 100 is controlled within a reasonable range, which can effectively compress the overall size of the optical lens 100, realize the miniaturization of the optical lens 100, and thus make the optical lens 100 more suitable for size-constrained devices such as portable electronic devices.

[0026] In some embodiments, the optical lens 100 satisfies the relationship: 1.20 ≤ BFL / F ≤ 1.35. For example, BFL / F can be 1.20, 1.23, 1.27, 1.30, 1.32, 1.35, etc., where BFL is the distance on the optical axis H from the image side S12 of the sixth lens L6 to the imaging plane IMG of the optical lens 100, and F is the effective focal length of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, it is easier to balance the effective focal length and BFL, ensuring that light rays in the entire field of view are clearly focused on the imaging plane IMG, thus guaranteeing the imaging quality of the optical lens 100.

[0027] In some embodiments, the optical lens 100 satisfies the relationship: 5.2 ≤ (|F1| + |F2|) / F ≤ 9.0. For example, (|F1| + |F2|) / F can be 5.2, 5.9, 6.7, 7.5, 8.4, 9.0, etc., where F1 is the effective focal length of the first lens L1, F2 is the effective focal length of the second lens L2, and F is the effective focal length of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, the combination of the first lens L1 and the second lens L2 bears a large system optical power in the entire optical lens, which can effectively correct the distortion of the optical lens 100 and balance the phase difference in the optical lens 100, thereby effectively improving the imaging effect of the optical lens 100.

[0028] In some embodiments, the optical lens 100 satisfies the relationship: -1.8 ≤ F1 / F ≤ -1.6. For example, F1 / F can be -1.80, 1.78, -1.75, -1.68, -1.63, -1.6, etc., where F1 is the effective focal length of the first lens L1 and F is the effective focal length of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, the ratio of the effective focal length of the first lens L1 to the total effective focal length of the optical lens 100 is controlled within a reasonable range. This avoids the total effective focal length of the optical lens 100 being too long, thereby facilitating distortion correction of the optical lens 100 and ensuring image quality and manufacturability.

[0029] In some embodiments, the optical lens 100 satisfies the relationship: 3 ≤ |F2 / F| ≤ 10. For example, |F2 / F| can be 3.0, 4.5, 6.3, 7.8, 8.8, 10.0, etc., where F2 is the effective focal length of the second lens L2 and F is the effective focal length of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, the second lens L2 has a suitable optical power and can effectively play the role of adjusting light.

[0030] In some embodiments, the optical lens 100 satisfies the relationship: 1.8 ≤ F3 / F ≤ 2.3. For example, F3 / F can be 1.80, 1.97, 2.0, 2.09, 2.18, 2.30, etc., where F3 is the effective focal length of the third lens L3 and F is the effective focal length of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, the third lens L3 converges the light rays, allowing the light rays to pass through the third lens L3 and be projected onto the fourth lens L4 at a suitable angle.

[0031] In some embodiments, the optical lens 100 satisfies the relationship: 0.9≤|F4 / F|≤1.4. For example, |F4 / F| can be 0.90, 0.99, 1.12, 1.29, 1.33, 1.40, etc., where F4 is the effective focal length of the fourth lens L4 and F is the effective focal length of the optical lens 100.

[0032] In some embodiments, the optical lens 100 satisfies the relationship: 1.0 ≤ |F5 / F| ≤ 1.9. For example, |F5 / F| can be 1.0, 1.06, 1.23, 1.54, 1.85, 1.90, etc., where F5 is the effective focal length of the fifth lens L5 and F is the effective focal length of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, the combination of the fourth lens L4 and the fifth lens L5 can control the light path and reduce aberrations caused by large-angle light.

[0033] In some embodiments, the optical lens 100 satisfies the relationship: 1.85 ≤ F6 / F ≤ 3.10. For example, F6 / F can be 1.85, 1.98, 2.04, 2.55, 2.89, 3.10, etc., where F6 is the effective focal length of the sixth lens L6 and F is the effective focal length of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, the sixth lens L6 adjusts the light at the rear, further correcting aberrations and ensuring that the light is projected onto the imaging plane IMG at a suitable angle, thereby improving image quality.

[0034] In some embodiments, the optical lens 100 satisfies the relationship: 2.8 ≤ CT12 / CT1 ≤ 3.6. For example, CT12 / CT1 can be 2.80, 2.97, 3.05, 3.24, 3.45, 3.6, etc., where CT1 is the thickness of the first lens L1 on the optical axis H, and CT12 is the distance on the optical axis H between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2. By selecting an optical lens 100 that satisfies the above condition, the distance on the optical axis H between the object-side surface S1 of the first lens L1 and the object-side surface S3 of the second lens L2 is controlled. This allows the first lens L1 to adjust large-angle light and project it onto the second lens L2 at a suitable angle, reducing the influence of the first lens L1 on field curvature and improving the imaging quality of the optical lens 100.

[0035] In some embodiments, the optical lens 100 satisfies the relationship: 0.55 ≤ CT2 / CT3 ≤ 1.35. For example, CT2 / CT3 can be 0.55, 0.88, 1.02, 1.23, 1.30, 1.35, etc., where CT2 is the thickness of the second lens L2 on the optical axis H, and CT3 is the thickness of the third lens L3 on the optical axis H. By selecting the optical lens 100 to satisfy the above condition, it is easier to configure the thickness of the second lens L2 and the third lens L3 to reduce the sensitivity of the optical lens 100.

[0036] In some embodiments, the optical lens 100 satisfies the relationship: 1.5 ≤ |F4 / CT4| ≤ 3.6. For example, |F4 / CT4| can be 1.5, 2.0, 2.3, 2.8, 3.1, 3.6, etc., where CT4 is the thickness of the fourth lens L4 on the optical axis H, and F4 is the effective focal length of the fourth lens L4. By selecting the optical lens 100 to satisfy the above condition, the thickness of the fourth lens L4 is controlled while ensuring that the fourth lens L4 has a suitable refractive power for light. This facilitates the processing and shaping of the fourth lens L4 and also facilitates the connection between the fourth lens L4 and the fifth lens L5 to form a cemented lens group.

[0037] In some embodiments, the optical lens 100 satisfies the relationship: -1.8 ≤ F1 / R2 ≤ -1.5. For example, F1 / R2 can be -1.80, -1.74, -1.68, -1.60, -1.56, -1.50, etc., where F1 is the effective focal length of the first lens L1, and R2 is the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis H. By selecting the optical lens 100 to satisfy the above condition, the relationship between the effective focal length of the first lens L1 and the image-side surface of the first lens L1 is controlled so that the angle at which the principal ray of the off-axis field of view is incident on the image-side surface of the first lens L1 is limited within a suitable range, thereby suppressing astigmatism.

[0038] In some embodiments, the optical lens 100 satisfies the relationship: 5.0 ≤ R1 / R2 ≤ 7.2. For example, R1 / R2 can be 5.0, 5.6, 6.0, 6.2, 6.6, 7.2, etc., where R1 is the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis H, and R2 is the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis H. By selecting an optical lens 100 that satisfies the above condition, it is beneficial to suppress astigmatism and limit the angle of incidence of the principal ray of the off-axis field of view on the image-side surface within a suitable range, thereby improving the imaging quality of the optical lens 100 while ensuring the field of view.

[0039] In some embodiments, the optical lens 100 satisfies the relationship: 0.34 ≤ R3 / R4 ≤ 1.30. For example, R3 / R4 can be 0.34, 0.58, 1.03, 1.16, 1.28, 1.30, etc., where R3 is the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis H, and R4 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis H. By selecting an optical lens 100 that satisfies the above condition, it is easier to select the shape of the second lens L2, reduce the sensitivity of the second lens L2, and facilitate the processing and shaping of the second lens L2.

[0040] In some embodiments, the optical lens 100 satisfies the relationship: -1.5 ≤ R5 / R6 ≤ 0. For example, R5 / R6 can be -5.0, -4.6, -3.9, -2.8, -1.5, -0.0, etc., where R5 is the radius of curvature of the object-side surface S5 of the third lens L3 at the optical axis H, and R6 is the radius of curvature of the image-side surface S6 of the third lens L3 at the optical axis H. By selecting an optical lens 100 that satisfies the above condition, the surface shape of the third lens L3 is controlled, allowing light to pass smoothly through the third lens L3 and be projected onto the rear lens group, which is beneficial for correcting astigmatism and field curvature.

[0041] In some embodiments, the optical lens 100 satisfies the relationship: 1.7 ≤ (R7-R8) / (R7+R8) ≤ 11. For example, (R7-R8) / (R7+R8) can be 1.7, 2.5, 5.0, 8.9, 10.0, 11.0, etc., where R7 is the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis H, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis H. By selecting an optical lens 100 that satisfies the above condition, the ratio of the radius of curvature of the object-side surface S7 to the radius of curvature of the image-side surface S8 of the fourth lens L4 can be controlled, thereby reducing assembly sensitivity and ensuring the assembly stability of the optical lens 100. However, an excessively large (R7-R8) / (R7+R8) will affect the imaging quality of the optical lens 100, while an excessively small (R7-R8) will result in poor manufacturability of the fourth lens L4.

[0042] In some embodiments, the optical lens 100 satisfies the relationship: -4 ≤ R7 / R8 ≤ -1. For example, R7 / R8 can be 4.0, 3.6, 3.2, 2.7, 2.1, 1.0, etc., where R7 is the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis H, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis H. By selecting the optical lens 100 to satisfy the above condition, the shape of the object-side surface S7 and the image-side surface S8 of the fourth lens L4 can be controlled, which is beneficial for correcting astigmatism and distortion.

[0043] In some embodiments, the optical lens 100 satisfies the relationship: 0 ≤ |R9 / R10| ≤ 0.8. For example, |R9 / R10| can be 0, 0.21, 0.36, 0.55, 0.67, 0.80, etc., where R9 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis H, and R10 is the radius of curvature of the image-side surface S10 of the fifth lens L5 at the optical axis H. By selecting the optical lens 100 to satisfy the above condition, the contribution of the object-side surface S9 and the image-side surface S10 of the fifth lens L5 to astigmatism is effectively controlled, thereby effectively improving the aberration of the optical lens 100 while ensuring the manufacturability of the shape of the fifth lens L5.

[0044] In some embodiments, the optical lens 100 satisfies the relationship: 0.05 ≤ |R11 / R12| ≤ 0.50. For example, |R11 / R12| can be 0.05, 0.19, 0.26, 0.34, 0.48, 0.50, etc., where R11 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis H, and R12 is the radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis H. By selecting an optical lens 100 that satisfies the above condition, it is beneficial for the sixth lens L6 to correct aberrations in the off-axis field of view and to ensure that the image size projected onto the imaging plane IMG by the light passing through the sixth lens L6 is appropriate, which is beneficial for the optical lens 100 to obtain high pixel counts.

[0045] In some embodiments, the optical lens 100 satisfies the relationship: 1.2 ≤ SD1 / IMGH ≤ 1.5. For example, SD1 / IMGH can be 1.20, 1.31, 1.36, 1.40, 1.46, 1.50, etc., where SD1 is half the maximum effective aperture (i.e., half aperture) of the object-side surface S1 of the first lens L1, and IMGH is half the image height corresponding to the maximum field of view of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, the first lens L1 can obtain a suitable amount of light intake while controlling the image height of the optical lens 100, thus facilitating the fulfillment of the requirements for high pixel count and good image quality of the optical lens 100.

[0046] In some embodiments, the optical lens 100 satisfies the relationship: 0.99 ≤ SD7 / SD6 ≤ 1.35. For example, SD7 / SD6 can be 0.99, 1.05, 1.10, 1.26, 1.30, 1.36, etc. SD6 is half the maximum effective aperture of the image side S6 of the third lens L3 (i.e., half aperture), and SD7 is half the maximum effective aperture of the object side S7 of the fourth lens L4 (i.e., half aperture). By selecting an optical lens 100 that satisfies the above condition, the deflection angle of light rays exiting from the third lens L3 and entering the fourth lens L4 can be reduced, which is beneficial for correcting aberrations and also helps to improve the assembly yield of the optical lens 100.

[0047] In some embodiments, the optical lens 100 satisfies the relationship: 1.4 ≤ CT6 / ET6 ≤ 2.3. For example, CT6 / ET6 can be 1.4, 1.6, 1.9, 2.0, 2.2, 2.3, etc., where CT6 is the thickness of the sixth lens L6 on the optical axis H, i.e., the center thickness of the sixth lens L6, and ET6 is the distance from the maximum effective half-aperture of the object side surface S11 of the sixth lens L6 to the maximum effective half-aperture of the image side surface S12 of the sixth lens L6 in the direction parallel to the optical axis H, i.e., the edge thickness of the sixth lens L6. By selecting the optical lens 100 to satisfy the above condition, it is convenient to control the surface shape of the sixth lens L6, so that the sixth lens L6 provides sufficient positive refractive force to balance the aberrations generated by other lenses, and makes the surface shape change of the sixth lens L6 gradual, which facilitates the processing and shaping of the sixth lens L6 and reduces the assembly difficulty of the sixth lens L6. When CT6 / ET6 is below the lower limit of 1.4, the edge thickness of the sixth lens L6 is too large, resulting in an excessively large incident angle of the principal ray from the edge field of view reaching the imaging plane IMG, which easily leads to vignetting. When CT6 / ET6 is above the upper limit of 2.3, the thickness ratio of the sixth lens L6 is too large, which greatly increases the manufacturing difficulty of the sixth lens L6 and is not conducive to improving the yield of optical lens 100.

[0048] In some embodiments, the optical lens 100 satisfies the relationship: 15 ≤ R1 / SAGS1 ≤ 32. For example, R1 / SAGS1 can be 15, 18, 22, 29, 30, 32, etc., where R1 is the radius of curvature of the object-side surface of the first lens L1 at the optical axis H, and SAGS1 is the distance from the intersection of the object-side surface S1 of the first lens L1 and the optical axis H to the maximum effective aperture of the object-side surface S1 of the first lens L1 on the optical axis H, i.e., the sagitta of the object-side surface S1 of the first lens L1. By selecting an optical lens 100 that satisfies the above condition, while the first lens L1 provides negative refractive power, it is beneficial to control the aperture of the first lens L1 to receive large-angle incident light and expand the field of view range of the first lens L1.

[0049] In some embodiments, the optical lens 100 satisfies the relationship: 0.35 ≤ |SAGS8 / SD8| ≤ 0.55. For example, |SAGS8 / SD8| can be 0.35, 0.39, 0.41, 0.48, 0.50, 0.55, etc., where SAGS8 is the distance from the intersection of the image-side surface S8 of the fourth lens L4 and the optical axis H to the maximum effective aperture of the image-side surface S8 of the fourth lens L4 on the optical axis H, i.e., the sag of the image-side surface S8 of the fourth lens L4, and SD8 is half of the maximum effective aperture of the image-side surface S8 of the fourth lens L4 (i.e., half aperture). By selecting the optical lens 100 to satisfy the above condition, the surface shape of the fourth lens L4 is prevented from being too curved, reducing the manufacturing difficulty of the fourth lens L4.

[0050] In some embodiments, the optical lens 100 satisfies the relationship: 0.13 ≤ SAGS11 / R11 ≤ 0.22. For example, SAGS11 / R11 can be 0.13, 0.16, 0.18, 0.19, 0.20, 0.22, etc., where R11 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis H, and SAGS11 is the distance from the intersection of the object-side surface S11 of the sixth lens L6 and the optical axis H to the maximum effective aperture of the object-side surface S11 of the sixth lens L6 on the optical axis H, i.e., the sagitta of the object-side surface S11 of the sixth lens L6. By selecting the optical lens 100 to satisfy the above condition, the surface shape of the object-side surface S11 of the sixth lens L6 is controlled. Based on the positive refractive power of the sixth lens L6, the sixth lens L6 converges light rays, effectively controlling the angle and range of light rays incident on the image-side surface of the sixth lens L6, which is beneficial to increasing the image plane IMG and facilitating the requirement of a large image plane.

[0051] In some embodiments, the optical lens 100 satisfies the relationship: 138° ≤ FOV*F / IMGH ≤ 153°. For example, FOV*F / IMGH can be 138°, 145°, 147°, 150°, 152°, 153°, etc., where FOV is the maximum field of view of the optical lens 100, IMGH is half the image height corresponding to the maximum field of view of the optical lens 100, and F is the effective focal length of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, while achieving a large field of view, it is also beneficial to ensure the image height of the optical lens 100, ensuring the size matching of the image on the imaging plane IMG, so that the optical lens 100 has a suitable image plane size, and improving the relative illumination of the optical lens 100. When FOV*F / IMGH is higher than the upper limit of 153°, it is difficult for the imaging plane IMG of the optical lens 100 to match with the photosensitive element, and the captured image is prone to vignetting, resulting in poor image quality. When FOV*F / IMGH is below the lower limit of 138°, the field of view of the optical lens is relatively small, which is not conducive to achieving a wide-angle view.

[0052] In some embodiments, the optical lens 100 satisfies the relationship: 3.2 ≤ CTMAX / CTMIN ≤ 4.1. For example, CTMAX / CTMIN can be 3.20, 3.36, 3.68, 3.89, 3.99, 4.10, etc., where CTMAX is the maximum thickness of each lens from the first lens L1 to the sixth lens L6 along the optical axis H, and CTMIN is the minimum thickness of each lens from the first lens L1 to the sixth lens L6 along the optical axis H. By selecting an optical lens 100 that satisfies the above condition, it is easier to balance the thickness ratio of the multiple lenses in the optical lens 100, adjust the lens distribution, and help to reduce volume and correct aberrations.

[0053] In some embodiments, the optical lens 100 satisfies the relationship: 78° ≤ FOV / FNO ≤ 90°. For example, FOV / FNO can be 78°, 80°, 82°, 85°, 88°, 90°, etc., where FOV is the maximum field of view of the optical lens 100, and FNO is the aperture number of the optical lens 100. By selecting an optical lens 100 that satisfies the above condition, it is beneficial to expand the field of view of the optical lens 100 and increase its aperture, achieving a balance between a large field of view and a large aperture.

[0054] In some embodiments, the optical lens 100 satisfies the relationship: 2.0 ≤ FNO ≤ 2.3. For example, FNO can be 2.00, 2.05, 2.10, 2.16, 2.22, 2.30, etc., where FNO is the aperture number of the optical lens 100. By selecting the optical lens 100 to satisfy the above condition, the optical lens 100 has a large aperture characteristic, increasing the amount of light entering the optical lens 100, making the optical lens 100 suitable for nighttime or low-light environments.

[0055] In some embodiments, to increase the freedom of surface design, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can all be aspherical, thus ensuring image quality. It is understood that in other embodiments, the surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical lens 100 can also be spherical.

[0056] In some embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can all be made of glass, thereby enabling the optical lens 100 to have good optical performance while reducing the impact of temperature on the lenses. In some embodiments, a portion of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can be made of glass, while another portion is made of plastic. This ensures that the impact of temperature on the lenses is reduced to achieve better imaging performance, while also reducing the manufacturing cost and weight of the lenses, thereby reducing the manufacturing cost and overall weight of the optical lens 100. In some embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 can all be made of plastic to reduce the weight and cost of the optical lens 100.

[0057] In this embodiment, the optical lens 100 further includes an aperture stop ST, which can be an aperture stop ST and / or a field stop ST. For example, the aperture stop ST can be an aperture stop ST, or it can be a field stop ST, or it can be both an aperture stop ST and a field stop ST. In this embodiment, the aperture stop ST is disposed between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 to limit the light transmission range between the third lens L3 and the fourth lens L4. It is understood that in other embodiments, the aperture stop ST can also be disposed between other lenses, and the setting can be adjusted according to the actual situation. This embodiment does not specifically limit this.

[0058] In some embodiments, the optical lens 100 further includes an Infrared Cut-off Filter (IRCut Filter), which is disposed between the image-side surface S12 of the sixth lens L6 and the imaging surface IMG of the optical lens 100. Exemplarily, the IR filter can be a dual-pass filter, capable of simultaneously transmitting high levels of visible light and transmitting a portion of infrared light, thereby enabling selection of different wavelengths. This allows for both visible light imaging and infrared imaging, achieving day and night usability. The IR filter can be made of glass, optical glass with a coating, or other materials, and can be selected according to actual needs; no specific limitation is made in this embodiment.

[0059] In some embodiments, the optical lens 100 further includes a protective glass CG disposed between the image-side surface S12 of the sixth lens L6 and the imaging surface IMG of the optical lens 100; or, when the optical lens 100 further includes a filter IR, the protective glass CG is disposed between the filter IR and the imaging surface IMG of the optical lens 100. The protective glass CG is used to protect the photosensitive element disposed at the imaging surface IMG.

[0060] The following will describe the assembly structure of the optical lens 100 in various specific embodiments and the corresponding implementation results, with reference to the accompanying drawings and tables and specific numerical values.

[0061] In the tables of conic constants and aspheric coefficients shown in the following embodiments, the numerical values ​​are expressed using exponential expressions with base 10. For example, "0.12E-05" means "0.12 × (10 to the power of negative 5)" and "9.87E+03" means "9.87 × (10 to the power of 3)".

[0062] In the optical lens 100 used in each embodiment, specifically, if the distance in the direction perpendicular to the optical axis H is set as "r", the paraxial curvature at the vertex of the aspherical surface of the lens is set as "c" (the paraxial curvature c is the reciprocal of the curvature radius R of the upper lens, i.e., c = 1 / R), the conic constant is set as "k", and the aspherical coefficients of the 4th, 6th, 8th, ..., i orders are set as "A4", "A6", "A8", ..., "Ai" respectively, and the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the aspherical surface in the direction parallel to the optical axis H is set as Z, then the surface shape Z of the aspherical surface is defined by the following mathematical formula 1.

[0063] Mathematical formula 1:

[0064] Example 1 Figure 1This is a schematic diagram of the structure of the optical lens 100 disclosed in Embodiment 1 of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, a protective glass CG, and an imaging surface IMG arranged sequentially from the object side to the image side along the optical axis H. The aperture stop ST is located between the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4. The image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 are connected to form a cemented lens group.

[0065] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis H, and its image-side surface S2 is concave near the optical axis H. The second lens L2 has negative refractive power. Its object-side surface S3 is concave near the optical axis H, and its image-side surface S4 is convex near the optical axis H. The third lens L3 has positive refractive power. Its object-side surface S5 is convex near the optical axis H, and its image-side surface S6 is convex near the optical axis H. The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex near the optical axis H, and its image-side surface S8 is convex near the optical axis H. The fifth lens L5 has negative refractive power. Its object-side surface S9 is concave near the optical axis H, and its image-side surface S10 is concave near the optical axis H. The sixth lens L6 has positive refractive power. The object-side surface S10 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S11 of the sixth lens L6 is convex near the optical axis H.

[0066] The relevant parameters of the optical lens 100 in this embodiment are given in Table 1 below. The elements along the optical axis H of the optical lens 100 from the object side to the image side are arranged sequentially from top to bottom according to Table 1. The Y-radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis H. The first value in the "thickness" parameter column of the lens in Table 1 is the thickness of the lens on the optical axis H, and the second value is the distance from the image side of the lens to the rear surface on the optical axis H. The value of the stop ST in the "thickness" parameter column of Table 1 is the distance from the stop ST to the vertex of the rear surface (the vertex refers to the intersection of the surface and the optical axis H) on the optical axis H. By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis H. When this value is negative, it indicates that the stop ST is located on the image side of the vertex of the rear surface. If the thickness of the stop ST is positive, the stop ST is on the object side of the vertex of the rear surface. In Table 1, FOV refers to the maximum field of view of the optical lens 100 (i.e., the field of view corresponding to the diagonal). It can be understood that the units of Y radius, thickness, effective focal length, and half-image height in Table 1 are all mm, and the refractive index, Abbe number, focal length, etc. in Table 1 are all obtained at a reference wavelength of 555.00 nm.

[0067] Table 1

[0068] The conic constant K and aspherical coefficients corresponding to the surfaces of each lens in Example 1 are shown in Table 2.

[0069] Table 2

[0070] Figure 2 Figures (A), (B), and (C) are respectively the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of Example 1.

[0071] The horizontal axis of the spherical aberration curve represents focal point shift in mm, and the vertical axis represents the normalized field of view. Figure 2 (A) When the wavelengths given are 435.00nm, 480.00nm, 510.00nm, 555.00nm, 610.00nm, 650.00nm and 950.00nm respectively, the focal shift of different fields of view is within ±0.10 mm, indicating that the spherical aberration of the optical lens 100 in this embodiment is small and the imaging quality is good.

[0072] The astigmatism curve plot shows the focal shift on the horizontal axis (mm) and the field of view on the vertical axis (deg). Figure 2 (B) The astigmatism curves given indicate that when the wavelength is 555.00 nm, the focal shift of both the sagittal and meridional image planes is within ±0.08 mm, which shows that the optical lens 100 in this embodiment has small astigmatism and good imaging quality.

[0073] The horizontal axis of the distortion curve represents the distortion rate (%), and the vertical axis represents the field of view (deg). Figure 2 (C) The distortion curve given indicates that the distortion at a wavelength of 555.00nm is within ±40%, which shows that the distortion of the optical lens 100 in this embodiment has been well corrected and the imaging quality is good.

[0074] according to Figure 2 As can be seen from Figures (A), (B) and (C), the optical lens 100 given in Example 1 can achieve good imaging effect.

[0075] Example 2 Figure 3This is a schematic diagram of the structure of the optical lens 100 disclosed in Embodiment 2 of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, a protective glass CG, and an imaging surface IMG arranged sequentially from the object side to the image side along the optical axis H. The aperture stop ST is located between the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4. The image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 are connected to form a cemented lens group.

[0076] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis H, and its image-side surface S2 is concave near the optical axis H. The second lens L2 has negative refractive power. Its object-side surface S3 is concave near the optical axis H, and its image-side surface S4 is convex near the optical axis H. The third lens L3 has positive refractive power. Its object-side surface S5 is convex near the optical axis H, and its image-side surface S6 is convex near the optical axis H. The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex near the optical axis H, and its image-side surface S8 is convex near the optical axis H. The fifth lens L5 has negative refractive power. Its object-side surface S9 is concave near the optical axis H, and its image-side surface S10 is concave near the optical axis H. The sixth lens L6 has positive refractive power. The object-side surface S10 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S11 of the sixth lens L6 is convex near the optical axis H.

[0077] Table 3 shows the parameters of the optical lens 100 in Embodiment 2 of this application. The meanings of each parameter are the same as those in Embodiment 1.

[0078] Table 3

[0079] The conic constant K and aspherical coefficients corresponding to the surfaces of each lens in Example 2 are shown in Table 4.

[0080] Table 4

[0081] Figure 4 Figures (A), (B), and (C) are respectively the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of Example 2.

[0082] Figure 4(A) When the wavelengths given are 435.00nm, 480.00nm, 510.00nm, 555.00nm, 610.00nm, 650.00nm and 940.00nm respectively, the focal shift of different fields of view is within ±0.20 mm, indicating that the spherical aberration of the optical lens 100 in this embodiment is small and the imaging quality is good.

[0083] Figure 4 (B) The astigmatism curves given indicate that when the wavelength is 555.00 nm, the focal shift of both the sagittal and meridional image planes is within ±0.10 mm, which shows that the optical lens 100 in this embodiment has small astigmatism and good imaging quality.

[0084] Figure 4 (C) The distortion curve given indicates that the distortion at a wavelength of 555.00nm is within ±25%, which shows that the distortion of the optical lens 100 in this embodiment has been well corrected and the imaging quality is good.

[0085] according to Figure 4 As can be seen from Figures (A), (B) and (C), the optical lens 100 given in Example 2 can achieve good imaging effect.

[0086] Example 3 Figure 5 This is a schematic diagram of the structure of the optical lens 100 disclosed in Embodiment 3 of this application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, a protective glass CG, and an imaging surface IMG arranged sequentially from the object side to the image side along the optical axis H. The aperture stop ST is located between the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4. The image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 are connected to form a cemented lens group.

[0087] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis H, and its image-side surface S2 is concave near the optical axis H. The second lens L2 has negative refractive power. Its object-side surface S3 is concave near the optical axis H, and its image-side surface S4 is convex near the optical axis H. The third lens L3 has positive refractive power. Its object-side surface S5 is convex near the optical axis H, and its image-side surface S6 is convex near the optical axis H. The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex near the optical axis H, and its image-side surface S8 is convex near the optical axis H. The fifth lens L5 has negative refractive power. Its object-side surface S9 is concave near the optical axis H, and its image-side surface S10 is concave near the optical axis H. The sixth lens L6 has positive refractive power. The object-side surface S10 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S11 of the sixth lens L6 is convex near the optical axis H.

[0088] Table 5 shows the parameters of the optical lens 100 of Embodiment 3 of this application. The meanings of each parameter are the same as those of the parameters in Embodiment 1.

[0089] Table 5

[0090] The conic constant K and aspherical coefficients corresponding to the surfaces of each lens in Example 3 are shown in Table 6.

[0091] Table 6

[0092] Figure 6 Figures (A), (B), and (C) are respectively the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of Example 3.

[0093] Figure 6 (A) When the wavelengths given are 435.00nm, 480.00nm, 510.00nm, 555.00nm, 610.00nm, 650.00nm and 940.00nm respectively, the focal shift of different fields of view is within ±0.15 mm, indicating that the optical lens 100 in this embodiment has small spherical aberration and good imaging quality.

[0094] Figure 6 (B) The astigmatism curves given indicate that when the wavelength is 555.00 nm, the focal shift of both the sagittal and meridional image planes is within ±0.10 mm, which shows that the optical lens 100 in this embodiment has small astigmatism and good imaging quality.

[0095] Figure 6(C) The distortion curve given indicates that the distortion at a wavelength of 555.00nm is within ±25%, which shows that the distortion of the optical lens 100 in this embodiment has been well corrected and the imaging quality is good.

[0096] according to Figure 6 As can be seen from Figures (A), (B) and (C), the optical lens 100 given in Example 3 can achieve good imaging effect.

[0097] Example 4 Figure 7 This is a schematic diagram of the structure of the optical lens 100 disclosed in Embodiment 4 of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, a protective glass CG, and an imaging surface IMG arranged sequentially from the object side to the image side along the optical axis H. The aperture stop ST is located between the image side S4 of the second lens L2 and the object side S5 of the third lens L3. The image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 are connected to form a cemented lens group.

[0098] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis H, and its image-side surface S2 is concave near the optical axis H. The second lens L2 has positive refractive power. Its object-side surface S3 is concave near the optical axis H, and its image-side surface S4 is convex near the optical axis H. The third lens L3 has positive refractive power. Its object-side surface S5 is convex near the optical axis H, and its image-side surface S6 is convex near the optical axis H. The fourth lens L4 has negative refractive power. Its object-side surface S7 is concave near the optical axis H, and its image-side surface S8 is concave near the optical axis H. The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex near the optical axis H, and its image-side surface S10 is convex near the optical axis H. The sixth lens L6 has positive refractive power. The object-side surface S10 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S11 of the sixth lens L6 is concave near the optical axis H.

[0099] Table 7 shows the parameters of the optical lens 100 of Embodiment 4 of this application. The meanings of each parameter are the same as those of the parameters in Embodiment 1.

[0100] Table 7

[0101] The conic constant K and aspherical coefficients corresponding to the surfaces of each lens in Example 4 are shown in Table 8.

[0102] Table 8

[0103] Figure 8 Figures (A), (B), and (C) are respectively the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of Example 4.

[0104] Figure 8 (A) When the wavelengths given are 435.00nm, 470.00nm, 510.00nm, 555.00nm, 610.00nm, 650.00nm and 940.00nm respectively, the focal shift of different fields of view is within ±0.05 mm, indicating that the optical lens 100 in this embodiment has small spherical aberration and good imaging quality.

[0105] Figure 8 (B) The astigmatism curves given indicate that when the wavelength is 555.00 nm, the focal shift of both the sagittal and meridional image planes is within ±0.025 mm, which shows that the optical lens 100 in this embodiment has small astigmatism and good imaging quality.

[0106] Figure 8 (C) The distortion curve given indicates that the distortion at a wavelength of 555.00nm is within ±50%, which shows that the distortion of the optical lens 100 in this embodiment has been well corrected and the imaging quality is good.

[0107] according to Figure 8 As can be seen from Figures (A), (B) and (C), the optical lens 100 given in Example 4 can achieve good imaging results.

[0108] Example 5 Figure 9 This is a schematic diagram of the structure of the optical lens 100 disclosed in Embodiment 5 of this application. The optical lens 100 includes a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter IR, a protective glass CG, and an imaging surface IMG arranged sequentially from the object side to the image side along the optical axis H. The aperture stop ST is located between the image side S4 of the second lens L2 and the object side S5 of the third lens L3. The image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 are connected to form a cemented lens group.

[0109] The first lens L1 has negative refractive power. Its object-side surface S1 is convex near the optical axis H, and its image-side surface S2 is concave near the optical axis H. The second lens L2 has positive refractive power. Its object-side surface S3 is concave near the optical axis H, and its image-side surface S4 is convex near the optical axis H. The third lens L3 has positive refractive power. Its object-side surface S5 is convex near the optical axis H, and its image-side surface S6 is convex near the optical axis H. The fourth lens L4 has negative refractive power. Its object-side surface S7 is concave near the optical axis H, and its image-side surface S8 is concave near the optical axis H. The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex near the optical axis H, and its image-side surface S10 is concave near the optical axis H. The sixth lens L6 has positive refractive power. The object-side surface S10 of the sixth lens L6 is convex near the optical axis H, and the image-side surface S11 of the sixth lens L6 is convex near the optical axis H.

[0110] Table 9 shows the parameters of the optical lens 100 of Embodiment 5 of this application. The meanings of each parameter are the same as those of the parameters in Embodiment 1.

[0111] Table 9

[0112] The conic constant K and aspherical coefficients corresponding to the surfaces of each lens in Example 5 are shown in Table 10.

[0113] Table 10

[0114] Figure 10 Figures (A), (B), and (C) are respectively the spherical aberration curve, astigmatism curve, and distortion curve of the optical lens 100 of Example 5.

[0115] Figure 10 (A) When the wavelengths given are 546.00nm, 910.00nm, 920.00nm, 940.00nm, 960.00nm and 970.00nm respectively, the focal shift of different fields of view is within ±0.05 mm, indicating that the spherical aberration of the optical lens 100 in this embodiment is small and the imaging quality is good.

[0116] Figure 10 (B) The astigmatism curves given indicate that when the wavelength is 940.00 nm, the focal shift of both the sagittal and meridional image planes is within ±0.025 mm, which shows that the optical lens 100 in this embodiment has small astigmatism and good imaging quality.

[0117] Figure 10(C) The distortion curve given indicates that the distortion at a wavelength of 940.00nm is within ±50%, which shows that the distortion of the optical lens 100 in this embodiment has been well corrected and the imaging quality is good.

[0118] according to Figure 10 As can be seen from Figures (A), (B) and (C), the optical lens 100 given in Example 5 can achieve good imaging results.

[0119] Table 11 shows the parameters of various conditional expressions for the optical lens 100 of Embodiments 1 to 5 of this application.

[0120] Table 11

[0121] As can be seen from Table 11, the parameters of the optical lenses 100 in Embodiments 1 to 5 of this application satisfy the range given by the above-mentioned conditional expressions.

[0122] Please see Figure 11 This application also provides a camera module 20. The camera module 20 includes an optical lens 100 and a photosensitive element 200 as described in any of the above embodiments. The photosensitive element 200 is disposed on the image side of the optical lens 100 and has a light-receiving surface 201. The imaging surface (IMG) of the optical lens 100 is located within the light-receiving surface 201 of the photosensitive element 200. The photosensitive element 200 may be a complementary metal-oxide-semiconductor (CMOS) semiconductor. Oxide Semiconductor (OSD) image sensor or charge-coupled device (CCD, Charge) Coupled Device).

[0123] Please see Figure 12 This application also provides a terminal device 10. The terminal device 10 includes a housing and a camera module 20, with the camera module 20 mounted on the housing. The terminal device 10 in this application includes, but is not limited to, mobile phones, digital tablets, laptops, cameras, video recorders, cameras, smart TVs, network monitoring equipment, motion-sensing game consoles, dashcams, reversing cameras, in-cabin monitoring devices, wearable electronic devices, small drones, 3D image capturing devices, or other forms of devices with photographing or video recording functions.

[0124] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0125] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical lens, characterized in that, There are a total of six lenses with refractive power, including 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 negative refractive power, and the object side of the first lens is convex near the optical axis and the image side is concave near the optical axis. The second lens has refractive power, and the object side of the second lens is concave near the optical axis, while the image side is convex near the optical axis. The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis, and the image side is convex near the optical axis. Both the fourth lens and the fifth lens have refractive power; The sixth lens has positive refractive power, and the object side of the sixth lens is convex near the optical axis; The optical lens satisfies the following relationships: 170°≤FOV≤200°, 6.6≤TTL / F≤6.8, where FOV is the maximum field of view of the optical lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, and F is the effective focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.72≤F / IMGH≤0.81; and / or, 4.8 ≤ TTL / IMGH ≤ 5.4; and / or, 1.20≤BFL / F≤1.35; Wherein, IMGH is half the image height corresponding to the maximum field of view of the optical lens, and BFL is the distance on the optical axis from the image side of the sixth lens to the imaging surface of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 5.2 ≤ (|F1| + |F2|) / F ≤ 9.0; and / or, 1.8 ≤ F3 / F ≤ 2.3; and / or, 1.85≤F6 / F≤3.10; Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, and F6 is the effective focal length of the sixth lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 2.8 ≤ CT12 / CT1 ≤ 3.6; and / or, 0.55≤CT2 / CT3≤1.35; and / or, 1.5≤|F4 / CT4|≤3.6; Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT12 is the distance between the image side of the first lens and the object side of the second lens on the optical axis, and F4 is the effective focal length of the fourth lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: -1.8 ≤ F1 / R2 ≤ -1.5; and / or, 1.7≤(R7-R8) / (R7+R8)≤11; and / or, 0.05≤|R11 / R12|≤0.50; Wherein, F1 is the effective focal length of the first lens, R2 is the radius of curvature of the image side of the first lens at the optical axis, R7 is the radius of curvature of the object side of the fourth lens at the optical axis, R8 is the radius of curvature of the image side of the fourth lens at the optical axis, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, and R12 is the radius of curvature of the image side of the sixth lens at the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 1.2 ≤ SD1 / IMGH ≤ 1.5; and / or, 0.99≤SD7 / SD6≤1.35; and / or, 1.4≤CT6 / ET6≤2.3; Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, SD6 is half of the maximum effective aperture of the image side of the third lens, SD7 is half of the maximum effective aperture of the object side of the fourth lens, CT6 is the thickness of the sixth lens on the optical axis, ET6 is the distance from the maximum effective half-aperture of the object side of the sixth lens to the maximum effective half-aperture of the image side of the sixth lens in the direction parallel to the optical axis, and IMGH is half of the image height corresponding to the maximum field of view of the optical lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 15≤R1 / SAGS1≤32; and / or, 0.35 ≤ |SAGS8 / SD8| ≤ 0.55; and / or, 0.13≤SAGS11 / R11≤0.22; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, SD8 is half of the maximum effective aperture of the image side of the fourth lens, SAGS1 is the distance from the intersection of the object side of the first lens and the optical axis to the maximum effective aperture of the object side of the first lens on the optical axis, SAGS8 is the distance from the intersection of the image side of the fourth lens and the optical axis to the maximum effective aperture of the image side of the fourth lens on the optical axis, and SAGS11 is the distance from the intersection of the object side of the sixth lens and the optical axis to the maximum effective aperture of the object side of the sixth lens on the optical axis.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 138°≤FOV*F / IMGH≤153°; and / or, 3.2 ≤ CTMAX / CTMIN ≤ 4.1; and / or, 78°≤FOV / FNO≤90°; Wherein, IMGH is half the image height corresponding to the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, CTMAX is the maximum thickness of each lens from the first lens to the sixth lens on the optical axis, and CTMIN is the minimum thickness of each lens from the first lens to the sixth lens on the optical axis.

9. A camera module, characterized in that, The camera module includes a photosensitive element and as claimed in claim 1. The optical lens of any one of the 8, wherein the photosensitive element is disposed on the image side of the optical lens.

10. A terminal device, characterized in that, The terminal device includes a housing and the camera module as described in claim 9, wherein the camera module is disposed in the housing.

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