A vehicle-mounted optical system and a camera module used therein

Abstract

The present invention provides a vehicle-mounted optical system and a camera module used therein. The vehicle-mounted optical system is installed in an optical lens, which is sequentially composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens can have an ultra-wide field of view angle range while having the characteristics of good thermal stability and low cost. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens, so as to meet people's high-definition imaging requirements for vehicle-mounted surround-view optical lenses.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to a vehicle-mounted optical system and a camera module used therein. Background Art

[0002] With the development of the automotive industry, in-vehicle systems such as ADAS (Advanced Driving Assistant System) and DMS (Driver Monitor System) have gradually matured and market demand has gradually increased. Among them, surround-view cameras are becoming increasingly widely used in automotive assisted driving systems.

[0003] The vehicle's surround-view system consists of four ultra-wide-angle cameras installed on the front, rear, left and right sides of the vehicle. They simultaneously capture images around the vehicle. After image processing, the images are finally stitched together into a seamless 360-degree panoramic bird's-eye view of the vehicle's perimeter, allowing the driver to clearly see the images around the car. This can effectively avoid accidents such as reversing and running over, scratching bumpers and wheels, etc. At the same time, the surround-view camera can also identify parking lane signs, curbs and nearby vehicles, greatly ensuring the car's driving safety.

[0004] However, because in-vehicle surround view systems operate in complex outdoor environments, they place extremely high demands on the wide-angle cameras they carry. They require not only a wide field of view but also excellent thermal stability, maintaining high resolution even in high and low temperature environments. Currently, conventional automotive lenses, in pursuit of wide angles and excellent thermal stability, typically use all-glass lenses. This results in larger lenses and higher costs, hindering market adoption. Summary of the Invention

[0005] In order to overcome the common problems of clarity and field of view angle range of existing vehicle-mounted surround-view lenses, the present application provides a vehicle-mounted optical system to improve the ability of the optical lens to capture details of the photographed objects, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted surround-view optical lenses.

[0006] A vehicle-mounted optical system, which is composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens in sequence from the object plane to the image plane along the optical axis;

[0007] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0008] The second lens has negative optical power and its image side surface is concave;

[0009] The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0010] The fourth lens has optical power, its object-side surface is convex, and its image-side surface is convex;

[0011] The fifth lens has negative optical power, its object-side surface is concave, and its image-side surface is concave;

[0012] The sixth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex.

[0013] The vehicle-mounted optical system as described above satisfies the following relationship:

[0014] 261<FOV / (DT11*IamgH / TTL)<266;

[0015] Wherein, FOV is the maximum field of view of the optical system, DT11 is the maximum effective radius of the object side of the first lens, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0016] The vehicle-mounted optical system as described above satisfies the following conditions:

[0017] f / EPD≤1.6;

[0018] Where f is the effective focal length of the optical system, and EPD is the entrance pupil diameter of the optical system.

[0019] The vehicle-mounted optical system as described above satisfies the following conditions:

[0020] 9.5<f1*f2 / f<11.5;

[0021] Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system.

[0022] The vehicle-mounted optical system as described above satisfies the following conditions:

[0023] 1.2≤(f3+f6) / f6<2.9;

[0024] Wherein, f3 is the effective focal length of the third lens, and f6 is the effective focal length of the sixth lens.

[0025] The vehicle-mounted optical system as described above satisfies the following conditions:

[0026] 0.1≤f*f2 / f5<1.4;

[0027] Wherein, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system.

[0028] The vehicle-mounted optical system as described above satisfies the following conditions:

[0029] 0.5<f23 / f56<1.5;

[0030] Among them, f23 is the combined focal length of the second lens and the third lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

[0031] The vehicle-mounted optical system as described above satisfies the following conditions:

[0032] 0<|R9+R10| / |R9|<2.0;

[0033] -1.4<R10 / f5<-0.2;

[0034] -1.2<R12 / f6<-0.1;

[0035] Among them, R9 is the curvature radius of the object side of the fifth lens, R10 is the curvature radius of the image side of the fifth lens, R12 is the curvature radius of the image side of the sixth lens, f5 represents the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0036] The vehicle-mounted optical system as described above satisfies the following conditions:

[0037] 2.6<(CT1+CT2+CT3+CT4+CT5+CT6) / CT3<3.3;

[0038] 2.0<(CT2+CT3) / T23<3.0;

[0039] 1.3<BFL / CT6<2.8;

[0040] Wherein, CT1 is the thickness of the first lens on the optical axis, that is, the center thickness of the first lens, 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, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and BFL is the shortest distance from the image side of the sixth lens to the imaging plane of the optical system.

[0041] The vehicle-mounted optical system as described above has an F number of 1.6, a full field of view angle of >206°, and a total lens length of ≤12.96 mm.

[0042] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, and the above-mentioned vehicle-mounted optical system is installed in the optical lens.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] The vehicle-mounted optical system of an embodiment of the present invention and the camera module used therein have the above-mentioned vehicle-mounted optical system installed in the optical lens, which is composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens in sequence. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens can have an ultra-wide field of view while having good thermal stability and low cost. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted surround-view optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0046] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0047] Figure 2 axial chromatic aberration, astigmatism, and distortion curves of the optical system or camera module of Example 1 of the present application;

[0048] Figure 3 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0049] Figure 4 axial chromatic aberration, astigmatism, and distortion curves of the optical system or camera module of Example 2 of the present application;

[0050] Figure 5 Schematic diagram of the structure of the optical system or camera module according to Example 3 of the present application;

[0051] Figure 6 axial chromatic aberration, astigmatism, and distortion curves of the optical system or camera module of Example 3 of the present application;

[0052] Figure 7 Schematic diagram of the structure of the optical system or camera module according to Example 4 of the present application;

[0053] Figure 8 These are the axial chromatic aberration, astigmatism and distortion curves of the optical system or camera module of Example 4 of the present application. DETAILED DESCRIPTION

[0054] like Figure 1-8As shown, the present application provides a vehicle-mounted optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the object plane to the image plane along the optical axis;

[0055] The first lens E1 has negative refractive power, its object-side surface is convex, and its image-side surface is concave;

[0056] The second lens E2 has negative refractive power, and its image side surface is concave;

[0057] The third lens E3 has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0058] The fourth lens E4 has optical power, its object-side surface is convex, and its image-side surface is convex;

[0059] The fifth lens E5 has negative refractive power, its object-side surface is concave, and its image-side surface is concave;

[0060] The sixth lens E6 has positive refractive power, its object-side surface is convex, and its image-side surface is convex.

[0061] An embodiment of the present invention provides an in-vehicle optical system. The optical system comprises, in order from the object plane to the image plane along the optical axis, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, and a sixth lens E6. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens can have an ultra-wide field of view while also having good thermal stability and low cost. Furthermore, the optical lens can better capture detailed information of objects, thereby enhancing the optical lens's ability to capture details of photographed objects, improving the image quality of the optical lens, and increasing the resolution and imaging clarity of the optical lens to meet the high-definition imaging requirements of in-vehicle surround-view optical lenses.

[0062] Furthermore, the optical system satisfies the following conditions: f / EPD ≤ 1.6; 261 < FOV / (DT11*IamgH / TTL) < 266; where f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, FOV is the maximum field of view of the optical imaging system, DT11 is the maximum effective radius of the object side of the first lens element E1, TTL is the on-axis distance from the object side of the first lens element E1 to the imaging plane, and ImgH is half the diagonal length of the effective pixel area on the imaging plane. This relationship reflects the constraints imposed on the field of view and thinness of the optical lens, enabling the optical system to meet wide-angle requirements while also maintaining excellent thinness and lightness, ensuring the optical system possesses the characteristics of ultra-wide angle, large aperture, miniaturization, and thinness. If the relationship falls below the lower limit, while ensuring an ultra-wide field of view, further increases in DT11*IamgH / TTL will overly compress the thinness of the optical lens, hindering its performance. If the relationship exceeds the upper limit, the optical lens will struggle to achieve good imaging resolution.

[0063] Furthermore, the optical system satisfies the following condition: 1.2 ≤ (f3 + f6) / f6 < 2.9, where f3 is the effective focal length of the third lens element E3, and f6 is the effective focal length of the sixth lens element E6. By adjusting the focal powers of the third lens element E3 and the sixth lens element E6, excessive concentration of the focal length on the third lens element E3 is avoided. This also helps constrain the surface profiles of the image-side surface of the third lens element E3 and the sixth lens element E6, preventing excessive curvature that could affect the manufacturability of the third lens element E3 and the sixth lens element E6. Furthermore, satisfying the above relationship can further enhance correction of higher-order aberrations while reducing tertiary aberrations such as spherical aberration, coma, and field curvature, thereby reducing the tolerance sensitivity of the optical lens. When the power is below the lower limit of the above relationship, the focal length of the third lens element E3 is excessively concentrated, resulting in excessive curvature of the object-side surface of the third lens element E3, which is detrimental to the manufacturability of the third lens element E3. When the power is above the upper limit of the above relationship, the focal length of the third lens element E3 is insufficient, which is detrimental to correction of aberrations in the optical lens and affects the tolerance sensitivity of the optical lens.

[0064] Furthermore, the optical system satisfies the following condition: 0.1 ≤ f*f2 / f5 < 1.4; where f2 is the effective focal length of the second lens element E2, f5 is the effective focal length of the fifth lens element E5, and f is the effective focal length of the optical imaging system. By properly controlling the ratio of the effective focal lengths of the second lens element E2, the fifth lens element E5, and the optical imaging system, the optical system can achieve a wide field of view while also achieving high imaging resolution. If the ratio exceeds the upper limit of the relationship, the refractive power of the second lens element E2 is insufficient, making it difficult for wide-angle light to enter the optical system, which is detrimental to expanding the optical system's field of view. If the ratio falls below the lower limit, the refractive power of the second lens element E2 is excessive, which can easily produce strong astigmatism and chromatic aberration, hindering high-resolution imaging.

[0065] Furthermore, the optical system satisfies the following condition: 0.5 < f23 / f56 < 1.5; where f23 is the combined focal length of the second lens E2 and the third lens E3, and f56 is the combined focal length of the fifth lens E5 and the sixth lens E6. By constraining the ratio of the combined focal length of the second lens E2 and the third lens E3 to the combined focal length of the fifth lens E5 and the sixth lens E6, the optical power and surface shape of the second lens E2, the third lens E3, the fifth lens E5, and the sixth lens E6 can be rationally distributed, thereby effectively constraining the aberration variation from the center to the edge of the optical lens field of view. At the same time, excessive curvature of the effective diameter area of the second lens E2, the third lens E3, the fifth lens E5, and the sixth lens E6 is avoided, thereby suppressing the degradation of the optical lens imaging performance and the sensitivity to decentering tilt generated during the manufacturing of each lens within a good range.

[0066] Furthermore, the optical system satisfies the following condition: 0<|R9+R10| / |R9|<2.0, where R9 is the radius of curvature of the object-side surface of the fifth lens element E5, and R10 is the radius of curvature of the image-side surface of the fifth lens element E5. By limiting the ratio of the radii of curvature of the object-side surface to the image-side surface of the fifth lens element E5, the shape of the fifth lens element E5 can be effectively constrained, thereby effectively controlling the aberration contribution rates of the object-side and image-side surfaces of the fifth lens element E5, effectively balancing the aberrations of the system related to the aperture zone, and thereby effectively improving the imaging quality of the system.

[0067] Furthermore, the optical system satisfies the following condition: -1.4<R10 / f5<-0.2, where f5 represents the effective focal length of the fifth lens element E5, and R10 represents the radius of curvature of the image-side surface of the fifth lens element E5 at the optical axis. When the above condition is met, the fifth lens element E5 can provide negative optical power to the imaging optical system, and by properly configuring the surface shape of the image-side surface of the fifth lens element E5, it is beneficial to further correct field curvature. When R10 / f5 is greater than -0.2, the surface shape of the image-side surface of the fifth lens element E5 will be too undulating, which is not conducive to lens processing; and when R10 / f5 is less than -1.4, the fifth lens element E5 cannot provide sufficient negative optical power for the lens, which is not conducive to correcting the lens field curvature.

[0068] Furthermore, the optical system satisfies the following condition: -1.2<R12 / f6<-0.1, where R12 is the radius of curvature of the image-side surface of the sixth lens element E6, and f6 is the effective focal length of the sixth lens element E6. By limiting the ratio of the radius of curvature of the image-side surface of the sixth lens element E6 to the effective focal length within an appropriate range, it is advantageous to control the incident light beam height entering the optical system, thereby reducing higher-order aberrations of the optical system and the outer diameter of the lens. It also corrects the effect of field curvature generated by the front lens group on the resolving power, thereby ensuring image quality at the edge of the field, improving the image quality of the optical lens, and enhancing the resolution and image clarity of the optical lens, thereby meeting the high-definition imaging requirements of automotive surround view optical lenses.

[0069] Furthermore, the optical system satisfies the following condition: 2.6 < (CT1 + CT2 + CT3 + CT4 + CT5 + CT6) / CT3 < 3.3, where CT1 is the thickness of the first lens E1 on the optical axis, i.e., the center thickness of the first lens E1; CT2 is the thickness of the second lens E2 on the optical axis; CT3 is the thickness of the third lens E3 on the optical axis; CT4 is the thickness of the fourth lens E4 on the optical axis; CT5 is the thickness of the fifth lens E5 on the optical axis; and CT6 is the thickness of the sixth lens E6 on the optical axis. When the above condition is satisfied, the ratio of the sum of the center thicknesses of the lenses in the optical system to the center thickness of the third lens E3 can be reasonably configured, which helps shorten the overall length of the optical system, making the optical system more compact and thus achieving a miniaturized design. It also helps reduce the decentering sensitivity of the third lens E3, thereby facilitating the production and assembly of the optical system. If the value exceeds the upper limit of the above conditional expression, the sum of the center thicknesses of the lenses will be too large, which is not conducive to achieving a compact structure and miniaturized design. If the value falls below the lower limit of the above conditional expression, the center thickness of the third lens E3 will be too large, resulting in increased decentering sensitivity of the fourth lens E4, which is not conducive to the production and assembly of the third lens E3.

[0070] Furthermore, the optical system satisfies the following condition: 2.0 < (CT2 + CT3) / T23 < 3.0, where CT2 is the center thickness of the second lens E2 on the optical axis, CT3 is the center thickness of the third lens E3 on the optical axis, and T23 is the air spacing between the second lens E2 and the third lens E3 on the optical axis. When this condition is met, the center thicknesses of the second lens E2 and the third lens E3, as well as the air spacing between the second lens E2 and the third lens E3 on the optical axis, can be effectively reduced, thereby facilitating a reduction in the overall length of the system and achieving a compact design. Furthermore, the air spacing between the second lens E2 and the fourth lens E4 on the optical axis is not excessively small, facilitating a smooth transition of light between the second lens E2 and the third lens E3, thereby facilitating correction of system aberrations, reducing system sensitivity, and improving system imaging quality and yield.

[0071] Furthermore, the optical system satisfies the following condition: 1.3 < BFL / CT6 < 2.8, where CT6 is the central thickness of the second lens element E2 on the optical axis, and BFL is the shortest distance from the image-side surface of the sixth lens element E6 to the imaging plane of the optical system. By controlling the above sub-equation within a reasonable range, the matching degree between the camera image and the image sensor is effectively ensured, ensuring the compatibility of the optical system with the image sensor. Simultaneously, controlling the thickness of the sixth lens element E6 on the optical axis reduces the total optical length of the optical system, further reducing the size of the optical system and further advancing miniaturization. This also facilitates the molding and assembly of the sixth lens element E6, reducing the production cost of the optical system. Furthermore, it reduces the optical system's sensitivity to decentering, thereby ensuring the optical system's imaging performance.

[0072] Furthermore, the second lens E2, the fourth lens E4, the fifth lens E5 and the sixth lens E6 are aspherical lenses, and the first lens E1 and the third lens E3 are spherical lenses, and are all separated and arranged with air as a spacer. By selecting two glass lenses and four aspherical plastic lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens can have an ultra-wide field of view angle while having the characteristics of good thermal stability, low cost and large aperture. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted surround-view optical lenses.

[0073] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 1 to 2 Describe the optical lens according to embodiment 1 of the present application, Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0074] like Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7 and an imaging surface S14.

[0075] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The filter E7 has an object-side surface S12 and an image-side surface S13. Light from the object passes through each surface S1 to S13 in sequence and is ultimately imaged on the imaging surface S14.

[0076] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Example 1, wherein the units of curvature radius and thickness are both millimeters (mm).

[0077] Table 1: Basic parameters of the optical system of Example 1

[0078] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 10.3373 0.9744 1.88,39.23 S2 spherical surface 2.5992 1.9680 S3 Q-type aspheric surface -10.5700 0.6414 1.54,55.77 S4 Q-type aspheric surface 1.3506 1.1517 S5 spherical surface 3.2628 2.6855 1.76,26.61 S6 spherical surface -5.3178 0.5830 STO spherical surface endless 0.0770 S7 Q-type aspheric surface 2.5796 0.9054 1.54,55.77 S8 Q-type aspheric surface -3.3246 0.3500 1.66,20.38 S9 Q-type aspheric surface 1.9392 0.1298 S10 Q-type aspheric surface 1.6892 1.4855 1.54,55.77 S11 Q-type aspheric surface -2.2467 0.1744 S12 spherical surface endless 0.7000 1.52,64.21 S13 spherical surface endless 1.1361 S14 spherical surface endless

[0079] In Table 1, any one of the object side and image side of the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 is a Q-type aspherical surface. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0080]

[0081] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0082] Table 2 Aspheric surface related values of the lens surface of Example 1

[0083]

[0084] Figure 2The following graphs show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 1. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism represents meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. As can be seen from the graph, the optical imaging lens of Example 1 achieves excellent imaging quality.

[0085] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 3 and 4 Describe the optical lens according to embodiment 2 of the present application, Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0086] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7 and an imaging surface S14.

[0087] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0088] Table 3 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 2, where the units of curvature radius and thickness are both millimeters (mm).

[0089] Table 3: Basic parameters of the optical system of Example 2

[0090] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 10.3869 1.2000 1.88,41.01 S2 spherical surface 2.7695 1.8697 S3 Q-type aspheric surface -4.5239 0.8154 1.55,55.99 S4 Q-type aspheric surface 1.8077 1.0021 S5 spherical surface 6.2656 2.1372 1.91,32.36 S6 spherical surface -4.3915 0.6245 STO spherical surface endless 0.3990 S7 Q-type aspheric surface 3.7348 0.9773 1.55,55.99 S8 Q-type aspheric surface -1.6646 0.1112 S9 Q-type aspheric surface -1.6200 0.4111 1.67,19.24 S10 Q-type aspheric surface 4.7844 0.1000 S11 Q-type aspheric surface 2.2978 1.3925 1.55,55.99 S12 Q-type aspheric surface -2.0317 0.1000 S13 spherical surface endless 0.7000 1.52,64.21 S14 spherical surface endless 1.0617 S15 spherical surface endless

[0091] In Table 3, any one of the object side and image side of the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 is a Q-type aspherical surface. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0092]

[0093] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0094] Table 4 Aspheric surface related values of the lens surface of Example 2

[0095]

[0096] Figure 4 The following graphs show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 2. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism represents meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. As can be seen from the graph, the optical imaging lens of Example 2 achieves excellent imaging quality.

[0097] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 5 and 6 Describe the optical lens according to embodiment 3 of the present application, Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0098] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7 and an imaging surface S14.

[0099] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0100] Table 5 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 3, where the units of curvature radius and thickness are both millimeters (mm).

[0101] Table 5: Basic parameters of the optical system of Example 3

[0102] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 9.4461 0.7000 1.88,40.87 S2 spherical surface 2.8414 2.1286 S3 Q-type aspheric surface -136.4995 0.7415 1.54,55.77 S4 Q-type aspheric surface 1.2317 1.2971 S5 spherical surface 4.2493 1.9891 1.76,27.55 S6 spherical surface -5.8449 1.0795 STO spherical surface endless 0.1019 S7 Q-type aspheric surface 2.7345 0.8254 1.54,55.77 S8 Q-type aspheric surface -2.3567 0.1286 S9 Q-type aspheric surface -2.2838 0.4000 1.66,20.38 S10 Q-type aspheric surface 2.0424 0.1000 S11 Q-type aspheric surface 1.5400 1.2234 1.54,55.77 S12 Q-type aspheric surface -2.1990 0.2528 S13 spherical surface endless 0.6100 1.52,64.21 S14 spherical surface endless 1.3221 S15 spherical surface endless

[0103] In Table 5, any one of the object side and image side of the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 is a Q-type aspherical surface. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0104]

[0105] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 6 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0106] Table 6 Aspheric surface related values of lens surface in Example 3

[0107]

[0108] Figure 6 The following graphs show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 3. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism represents meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. As can be seen from the graph, the optical imaging lens of Example 3 achieves excellent imaging quality.

[0109] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 7 and 8 Describe the optical lens according to embodiment 4 of the present application, Figure 7 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0110] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7 and an imaging surface S14.

[0111] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The filter E7 has an object-side surface S12 and an image-side surface S13. Light from the object passes through each surface S1 to S13 in sequence and is ultimately imaged on the imaging surface S14.

[0112] Table 7 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 4, where the units of curvature radius and thickness are both millimeters (mm).

[0113] Table 7: Basic parameters of the optical system of Example 4

[0114]

[0115]

[0116] In Table 7, the object side and image side of any one of the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 are all Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but not limited to, the following aspherical formula.

[0117]

[0118] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 8 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0119] Table 8 Aspheric surface related values of lens surface in Example 4

[0120] Surface number S3 S4 S7 S8 S9 S10 S11 K -2.45E+01 -3.97E-01 -6.13E+00 -1.08E+01 -1.13E+01 -7.43E+00 -5.85E-01 A4 1.24E-01 -3.01E-01 -6.84E-03 -3.43E-01 -1.01E-01 -8.51E-02 9.53E-02 A6 -1.21E-01 -1.72E-01 3.11E-04 3.66E-02 2.21E-02 6.02E-03 -1.16E-02 A8 3.20E-02 -4.12E-02 5.38E-04 -8.92E-03 -2.17E-03 3.20E-04 2.41E-03 A10 -2.93E-02 -2.82E-02 5.54E-04 -1.61E-03 1.59E-03 2.66E-03 1.48E-03 A12 -2.62E-03 -1.11E-02 6.70E-04 -4.62E-03 -1.22E-03 -1.20E-05 1.31E-03 A14 -1.07E-02 -4.98E-03 3.29E-04 -1.58E-03 -3.80E-04 -1.39E-05 2.04E-04 A16 -4.09E-03 -1.17E-03 1.86E-04 5.25E-04 -2.52E-04 -7.72E-05 1.66E-04 A18 -4.31E-03 4.77E-04 1.25E-05 1.24E-03 -1.83E-04 -2.73E-05 -3.74E-05 A20 -1.97E-03 1.08E-03 -7.24E-07 1.45E-03 -5.78E-05 9.89E-06 5.05E-05 A22 -1.51E-03 1.12E-03 -2.80E-05 8.45E-04 -8.89E-05 2.03E-06 -2.86E-05 A24 -5.78E-04 7.98E-04 -7.84E-06 4.87E-04 -2.75E-05 3.79E-06 2.05E-05 A26 -3.05E-04 5.42E-04 -2.69E-05 1.54E-04 -4.62E-05 2.29E-07 -1.85E-05 A28 -6.70E-05 2.59E-04 -2.15E-05 8.32E-05 -2.11E-05 -2.16E-06 1.75E-05 A30 -1.93E-05 1.15E-04 -1.92E-05 2.92E-05 -1.23E-05 5.83E-07 -6.62E-06

[0121] Figure 8The following graphs show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 4. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism represents meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. As can be seen from the graph, the optical imaging lens of Example 4 achieves excellent imaging quality.

[0122] In Examples 1-4, the basic data are shown in Table 9 below:

[0123] Table 9 Basic data of Examples 1-4

[0124] Basic data / Example 1 2 3 4 f1(mm) -4.15 -4.60 -4.82 -3.99 f2(mm) -2.19 -2.26 -2.27 -2.35 f3(mm) 3.05 3.11 3.53 2.82 f5(mm) -2.58 -22.35 -1.55 -2.99 f6(mm) 2.07 15.53 1.90 2.05 f(mm) 0.95 0.95 0.95 0.95 TTL(mm) 12.96 12.90 12.90 12.96 BFL(mm) 2.01 3.25 3.41 2.24 FOV(°) 206.00 206.00 206.00 206.00 f / EPD 1.60 1.60 1.60 1.60

[0125] In Examples 1-4, the basic data are shown in Table 10 below:

[0126] Table 10 Conditional formulas for Examples 1-4

[0127] Conditional formula / Example 1 2 3 4 DT11 5.10 5.00 5.00 5.10 IamgH 2.00 2.01 2.00 2.00 f23 6.60 6.86 14.37 3.94 f56 4.67 11.67 12.86 3.60 R9 -3.32 -1.62 -2.28 -1.44 R10 1.94 4.78 2.04 2.81 R12 -2.25 -2.03 -2.20 -2.00 CT1 0.97 1.20 0.70 1.14 CT2 0.64 0.82 0.74 0.50 CT3 2.69 2.14 1.99 2.65 CT4 0.91 0.98 0.83 0.90 CT5 0.35 0.41 0.40 0.35 CT6 1.49 1.39 1.22 1.44 T23 1.15 1.00 1.30 1.33 FOV / (DT11*IamgH / TTL) 261.76 263.97 265.74 261.74 f1*f2 / f 9.57 10.93 11.49 9.84 (f3+f6) / f6 2.47 1.20 2.86 2.38 f*f2 / f5 0.81 0.10 1.39 0.74 f23 / f56 1.41 0.59 1.12 1.10 |R9+R10| / |R9| 0.42 1.95 0.11 0.96 R10 / f5 -0.75 -0.21 -1.31 -0.94 R12 / f6 -1.09 -0.13 -1.16 -0.97 (CT1+CT2+CT3+CT4+CT5+CT6) / CT3 2.62 3.24 2.96 2.64 (CT2+CT3) / T23 2.89 2.95 2.11 2.36 BFL / CT6 1.35 2.34 2.79 1.55

[0128] A camera module includes at least an optical lens, in which the above-mentioned vehicle-mounted optical system is installed. The optical lens is composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens in sequence. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens can have an ultra-wide field of view angle range while having good thermal stability and low cost. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted surround-view optical lenses.

[0129] The above descriptions are provided in conjunction with specific content to provide one or more embodiments, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the methods, structures, etc. of the present invention, or any technical deduction or substitution based on the concept of the present invention, shall be considered within the scope of protection of the present invention.

Claims

1. A vehicle-mounted optical system, comprising, in order from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power and its image side surface is concave; The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The fifth lens has negative optical power, its object-side surface is concave, and its image-side surface is concave; The sixth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The first lens is a spherical lens; The optical system satisfies the following relationship: 261° / mm < FOV / (DT11*ImgH / TTL) < 266° / mm; Wherein, FOV is the maximum field of view of the optical system, DT11 is the maximum effective radius of the object side of the first lens, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half the diagonal length of the effective pixel area on the imaging surface.

2. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: f / EPD ≤ 1.6; Where f is the effective focal length of the optical system, and EPD is the entrance pupil diameter of the optical system.

3. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 9.5mm < f1*f2 / f < 11.5mm; Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system.

4. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 1.2 ≤ (f3+f6) / f6 < 2.9; Wherein, f3 is the effective focal length of the third lens, and f6 is the effective focal length of the sixth lens.

5. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 0.1mm ≤f*f2 / f5 < 1.4mm; Wherein, f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system.

6. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 0.5 < f23 / f56 < 1.5; Among them, f23 is the combined focal length of the second lens and the third lens, and f56 is the combined focal length of the fifth lens and the sixth lens.

7. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 0 < |R9+R10| / |R9| < 2.0; -1.4 < R10 / f5 < -0.2; -1.2 < R12 / f6 < -0.1; Among them, R9 is the curvature radius of the object side of the fifth lens, R10 is the curvature radius of the image side of the fifth lens, R12 is the curvature radius of the image side of the sixth lens, f5 represents the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

8. The vehicle-mounted optical system according to claim 1, wherein: The optical system meets the following conditions: 2.6 < (CT1+CT2+CT3+CT4+CT5+CT6) / CT3 < 3.3; 2.0 < (CT2+CT3) / T23 < 3.0; 1.3 < BFL / CT6 < 2.8; Wherein, CT1 is the thickness of the first lens on the optical axis, that is, the center thickness of the first lens, 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, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, T23 is the air gap between the second and third lenses on the optical axis, and BFL is the shortest distance on the optical axis from the image side of the sixth lens to the imaging plane of the optical system.

9. The vehicle-mounted optical system according to claim 1, wherein: The optical system has an F number of 1.6, a full field of view angle of >206°, and a total lens length of ≤12.96 mm.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the vehicle-mounted optical system according to any one of claims 1 to 9.

Images