Large-aperture small-size optical imaging system and camera module applied by same

Abstract

The utility model provides a large-aperture small-volume optical imaging system and a camera module applying the same, which are composed of eight lenses, the first lens has positive focal power, the object side surface is a convex surface, the image side surface is a convex surface, the second lens has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the third lens has positive focal power, the image side surface is a convex surface, and the fourth lens has negative focal power. The fourth lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface is a concave surface; the sixth lens has positive focal power, the object side surface is a convex surface; the seventh lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; according to the optical lens, aberration can be effectively corrected, so that the optical lens has better imaging quality, larger aperture size, smaller volume and better thermal stability, and the overall imaging quality is improved.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more particularly to a large-aperture, small-volume optical imaging system and its application in camera modules. Background Technology

[0002] With the continuous development of science and technology and the continuous improvement of people's living standards, the application range of optical lenses is becoming wider and wider. Electronic devices equipped with optical lenses (such as aerial cameras, action cameras, or handheld gimbal cameras) are also becoming thinner and smaller, and the requirements for optical lenses are becoming more diversified, requiring optical lenses to have better image quality, larger aperture, smaller size, and better thermal stability. However, existing optical lenses are difficult to balance among these requirements. Utility Model Content

[0003] This application aims to provide a large-aperture, small-volume optical imaging system that can effectively compress the size of the optical system while ensuring image quality, a large aperture, and thermal stability, thereby achieving a small and lightweight lens design.

[0004] A large-aperture, small-volume optical imaging system comprises, along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.

[0005] The first lens has positive optical power, and its object side is convex, and its image side is convex.

[0006] The second lens has negative optical power, its object side is convex, and its image side is concave.

[0007] The third lens has positive optical power and its image-side surface is convex.

[0008] The fourth lens has positive optical power, its object side is concave, and its image side is convex.

[0009] The fifth lens has negative optical power and its object side is concave.

[0010] The sixth lens has positive optical power and its object-side surface is convex.

[0011] The seventh lens has positive optical power, its object side is convex, and its image side is concave.

[0012] The eighth lens has negative optical power, its object side is convex, and its image side is concave.

[0013] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the optical lens is equipped with the above-mentioned large aperture small volume optical imaging system.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This utility model provides a large-aperture, small-volume optical imaging system and its application camera module, which consists of 8 lenses. By selecting an appropriate number of lenses and rationally configuring the diopter, surface shape, thickness, and air gap of each lens, aberrations can be effectively corrected, so that the optical lens can simultaneously have better image quality, a larger aperture, a smaller volume, and better thermal stability, thereby improving the overall image quality. This application can effectively compress the volume of the optical system while ensuring image quality, a larger aperture, and thermal stability, achieving a small and lightweight lens design. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used are briefly described below.

[0017] Figure 1 This is a schematic diagram of the optical imaging system of Embodiment 1 of this application;

[0018] Figure 2 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 1 of this application;

[0019] Figure 3 This is a schematic diagram of the optical imaging system of Embodiment 2 of this application;

[0020] Figure 4 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 2 of this application;

[0021] Figure 5 This is a schematic diagram of the optical imaging system of Embodiment 3 of this application;

[0022] Figure 6 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 3 of this application;

[0023] Figure 7 This is a schematic diagram of the optical imaging system of Embodiment 4 of this application;

[0024] Figure 8 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 4 of this application;

[0025] Figure 9 This is a schematic diagram of the optical imaging system of Embodiment 5 of this application;

[0026] Figure 10 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 5 of this application;

[0027] Figure 11This is a schematic diagram of the optical imaging system of Embodiment 6 of this application;

[0028] Figure 12 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system of Embodiment 6 of this application. Detailed Implementation

[0029] like Figure 1-12 As shown, a large-aperture, small-volume optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and an infrared filter arranged sequentially from the object side. The aperture stop is located before the first lens or between the first and second lenses. The first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are all aspherical lenses and are separated by air gaps. The first lens has positive optical power, with both its object-side and image-side surfaces being convex. The second lens has negative optical power. The object-side surface of the optical system is convex, and the image-side surface is concave. The third lens has positive optical power and its image-side surface is convex. The fourth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex. The fifth lens has negative optical power and its object-side surface is concave. The sixth lens has positive optical power and its object-side surface is convex. The seventh lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The eighth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. The optical system has a field of view > 89°, a total lens length ≤ 11.3 mm, and an effective focal length < 7.12 mm. The optical imaging system of this utility model consists of 8 lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power, surface shape, thickness and air gap of each lens, aberrations can be effectively corrected, so that the optical lens can have better imaging quality, larger aperture, smaller volume and better thermal stability at the same time, thereby improving the overall imaging quality. This application can effectively compress the volume of the optical system while ensuring imaging quality, larger aperture and thermal stability, and realize the small and lightweight design of the lens.

[0030] The optical imaging system satisfies the following relationship: 1.10 ≤ FOV / TTL / IamgH ≤ 1.25, where FOV is the maximum field of view of the optical imaging system, TTL is the on-axis distance from the object side of the first lens to the imaging plane, and ImgH is half the diagonal length of the effective pixel area on the imaging plane. This relationship reflects the ratio of the field of view per unit image height of the optical lens to the system length, balancing the field of view with the compactness of the lens, while avoiding the difficulty in correcting aberrations due to an excessively short TTL. This condition ensures that the system provides sufficient field of view coverage while maintaining a small size.

[0031] The optical imaging system satisfies the following relationship: 5.40 ≤ f*tan(HFOV) / CT3 ≤ 7.65, where f is the effective focal length of the optical imaging system, HFOV is the half-field of view of the optical imaging system, and CT3 is the center thickness of the third lens on the optical axis. This relationship reflects the geometric relationship between the focal length and field of view of the optical lens, and, combined with the thickness of the third lens, can be used to control the angle of incidence of light and the difficulty of lens manufacturing. An excessively thin CT3 may lead to structural fragility, while an excessively thick CT3 may increase the system weight or spherical aberration.

[0032] The optical imaging system satisfies the following relationship: 2.85 ≤ f1*fno / f ≤ 3.56, where f is the effective focal length of the optical imaging system, HFOV is the half field of view of the optical imaging system, and CT3 is the center thickness of the third lens on the optical axis. To balance the optical power of the first lens with the system aperture, a larger f1·fno / f value means that the first lens has a weak positive optical power, which, combined with a smaller aperture, controls aberrations while avoiding insufficient light intake.

[0033] This optical imaging system satisfies the following relationship: 4.50 ≤ |f4*f5 / f6| ≤ 9.60, where f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. By constraining the power distribution of the fourth, fifth, and sixth lenses, excessive concentration of light on the sixth lens is avoided. This also helps to constrain the surface shape of the image side of the sixth lens, preventing excessive curvature that could affect its manufacturability. Furthermore, satisfying the above relationship can further enhance the correction of higher-order aberrations, reducing spherical aberration, coma, and field curvature, while also lowering the tolerance sensitivity of the optical lens.

[0034] The optical imaging system satisfies the following relationship: 1.80 ≤ (f7-f8) / f3 ≤ 3.45, where f3 is the effective focal length of the third lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. By constraining the power distribution of the third, seventh, and eighth lenses, the power distribution of the system can be properly optimized. This can be used to compensate for axial chromatic aberration and control the power of the rear lens group, thus suppressing the degradation of the imaging performance of the optical lens and the sensitivity to eccentricity and tilt caused during the manufacturing of each lens within a good range.

[0035] The optical imaging system satisfies the following relationship: 1.30 ≤ f23 / f13 ≤ 2.55; where f12 is the combined focal length of the first and second lenses, and f23 is the combined focal length of the second and third lenses. By controlling the ratio of the combined focal length of the first and second lenses to the combined focal length of the second and third lenses, a smooth light transition is ensured, avoiding astigmatism or distortion, which is beneficial to improving image quality.

[0036] The optical imaging system satisfies the following relationship: 1.02 ≤ f56 / f5678 ≤ 1.73, where f56 is the combined focal length of the fifth and sixth lenses, and f5678 is the combined focal length of the fifth, sixth, seventh, and eighth lenses. This ratio range helps balance aberration correction and system compactness, improving image quality. Aberration control: By controlling the ratio of the combined focal length of the fifth and sixth lenses to the combined focal length of the fifth, sixth, seventh, and eighth lenses, aberrations such as spherical aberration and chromatic aberration can be effectively reduced, contributing to aberration correction and system compactness, reducing the size of the optical system, facilitating integration into small devices, and helping to reduce the processing difficulty and production cost of optical lens groups.

[0037] The optical imaging system satisfies the following relationship: 1.90 ≤ f2 / (R2+R3) ≤ 3.45, where R2 is the radius of curvature of the object-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and f2 is the effective focal length of the second lens. By controlling the ratio of the sum of the radii of curvature of the object-side surface of the first lens and the object-side surface of the second lens to the effective focal length of the second lens, specific lens shapes (biconvex lenses and meniscus) can be effectively controlled. This helps optimize the light propagation path, avoids excessive deflection of light during transmission between lenses, and reduces the manufacturing difficulty of the optical lens assembly.

[0038] The optical imaging system satisfies the following relationship: 2.80 ≤ |R15+R16| / |R15-R16| ≤ 5.65; where R15 is the radius of curvature of the object-side surface of the eighth lens, and R16 is the radius of curvature of the image-side surface of the eighth lens. By controlling the radii of curvature of the object-side and image-side surfaces of the eighth lens, higher-order aberrations can be reduced, and the incident angle of the principal rays in each field of view of the optical imaging lens on the image plane can be reasonably controlled, thus meeting the requirements of the principal ray incident angle in the optical system design.

[0039] The optical imaging system satisfies the following relationship: 1.00 ≤ CT5 / T45 ≤ 3.10, where CT5 is the center thickness of the fifth lens on the optical axis, and T45 is the air gap between the fourth and fifth lenses on the optical axis. By controlling the ratio of the air gap between the fourth and fifth lenses on the optical axis to the thickness of the fifth lens, sufficient gap is ensured to adjust aberrations (such as field curvature), while avoiding excessively thin lenses that would lead to manufacturing difficulties.

[0040] The optical imaging system satisfies the following relationship: 2.50 ≤ |(DT31-DT32) / (DT21-DT22)| ≤ 4.25, where DT31 is the maximum effective radius of the object-side surface of the third lens, DT32 is the maximum effective radius of the image-side surface of the third lens, DT21 is the maximum effective radius of the object-side surface of the second lens, and DT22 is the maximum effective radius of the image-side surface of the second lens. Controlling the ratio of the rate of change of the effective radii of the third and second lenses can effectively control vignetting and the height of edge rays, reduce the aberration of the edge field of view, improve resolution, and simultaneously reduce the size of the lens, meeting the requirements for lens miniaturization.

[0041] The optical imaging system satisfies the following relationship: 12.65 ≤ DT71 / SAG13 + DT72 / SAG14 ≤ 16.55; where DT71 is the maximum effective radius of the object side of the seventh lens, DT72 is the maximum effective radius of the image side of the seventh lens, SAG13 is the distance from the point where the object side of the seventh lens has the maximum effective aperture to the point where the object side of the first lens intersects with the optical axis, and the distance from the point where the image side of the first lens intersects with the optical axis, and the distance from the point where the object side of the seventh lens has the maximum effective aperture to the point where the image side of the first lens intersects with the optical axis, and the distance from the point where the image side of the first lens intersects with the optical axis, and the distance from the point where the image side of the seventh ...

[0042] Example 1, the following is a reference Figures 1 to 2 This describes an optical imaging lens according to Embodiment 1 of this application. For example... Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0043] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave 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 convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0044] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0045] Table 1

[0046]

[0047] In Table 1, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0048]

[0049] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 2 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the first embodiment.

[0050] Table 2

[0051]

[0052] Example 2, the following is a reference Figures 3 to 4Describes an optical imaging lens according to Embodiment 2 of this application. For example... Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0053] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 positive optical power, with its object-side surface S7 being concave 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 convex. 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0054] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment 2, wherein the units for radius of curvature and thickness are millimeters (mm).

[0055] Table 3

[0056]

[0057] In Table 3, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be limited by, but is not limited to, the following aspherical formulas:

[0058]

[0059] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r maxTable 4 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the second embodiment.

[0060] Table 4

[0061]

[0062] Example 3, the following is a reference Figures 5 to 6 This describes an optical imaging lens according to Embodiment 3 of this application. For example... Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0063] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 positive optical power, with its object-side surface S7 being concave 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 convex. 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0064] Table 5 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment 3, wherein the units for radius of curvature and thickness are millimeters (mm).

[0065] Table 5

[0066]

[0067] In Table 6, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be limited by, but is not limited to, the following aspherical formulas:

[0068]

[0069] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 6 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the third embodiment.

[0070] Table 6

[0071]

[0072] Example 4, the following reference Figures 7 to 8 Describes an optical imaging lens according to Embodiment 4 of this application. For example... Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0073] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 positive optical power, with its object-side surface S7 being concave 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 convex. 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0074] Table 7 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment 4, wherein the units for radius of curvature and thickness are millimeters (mm).

[0075] Table 7

[0076]

[0077] In Table 8, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be limited by, but is not limited to, the following aspherical formulas:

[0078]

[0079] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 8 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the fourth embodiment.

[0080] Table 8

[0081]

[0082] Example 5, the following reference Figures 9 to 10 This describes an optical imaging lens according to Embodiment 5 of this application. For example... Figure 9 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0083] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 positive optical power, with its object-side surface S7 being concave 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 convex. 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0084] Table 9 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment 5, wherein the units for radius of curvature and thickness are millimeters (mm).

[0085] Table 9

[0086]

[0087] In Table 10, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be limited by, but is not limited to, the following aspherical formulas:

[0088]

[0089] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 8 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the fifth embodiment.

[0090] Table 10

[0091]

[0092] Example 6, the following refers to Figures 11 to 12 Describes an optical imaging lens according to Embodiment Six of this application. For example... Figure 11 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter E9, and an imaging surface S19.

[0093] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. 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 positive optical power, with its object-side surface S7 being concave 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 convex. 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E7 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0094] Table 11 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Embodiment Six, wherein the units for radius of curvature and thickness are millimeters (mm).

[0095] Table 11

[0096]

[0097] In Table 12, the object-side surface and image-side surface of any one of the lenses E1, E2, E3, E4, E5, E6, E7, and E8 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be limited by, but is not limited to, the following aspherical formulas:

[0098]

[0099] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r maxTable 8 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the sixth embodiment.

[0100] Table 12

[0101]

[0102] In Examples 1-6, the basic data is as follows:

[0103] Table 13

[0104]

[0105] In Examples 1-6, each conditional expression satisfies the conditions in the table below:

[0106] Table 14

[0107]

[0108] A camera module includes at least an optical lens, in which the aforementioned large-aperture, small-volume optical imaging system is installed. This invention selects an appropriate number of lenses and rationally configures the diopter, surface shape, thickness, and air gap of each lens to effectively correct aberrations, thereby enabling the optical lens to simultaneously possess better imaging quality, a larger aperture, a smaller volume, and better thermal stability, thus improving the overall imaging quality.

[0109] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

Claims

1. A large-aperture, small-volume optical imaging system, characterized in that: Along the optical axis from the object plane to the image plane, the lenses are sequentially arranged as follows: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens. The first lens has positive optical power, and its object side is convex, and its image side is convex. The second lens has negative optical power, its object side is convex, and its image side is concave. The third lens has positive optical power and its image-side surface is convex. The fourth lens has positive optical power, its object side is concave, and its image side is convex. The fifth lens has negative optical power and its object side is concave. The sixth lens has positive optical power and its object-side surface is convex. The seventh lens has positive optical power, its object side is convex, and its image side is concave. The eighth lens has negative optical power, its object side is convex, and its image side is concave.

2. The large-aperture, small-volume optical imaging system according to claim 1, characterized in that, The following relationship must be satisfied: 4.50 ≤ |f4*f5 / f6| ≤ 9.60; and / or 1.80 ≤ (f7-f8) / f3 ≤ 3.45; and / or 1.30 ≤ f23 / f13 ≤ 2.55; and / or 1.02 ≤ f56 / f5678 ≤ 1.73; Wherein, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, f12 is the combined focal length of the first and second lenses, f23 is the combined focal length of the second and third lenses, f56 is the combined focal length of the fifth and sixth lenses, and f5678 is the combined focal length of the fifth, sixth, seventh, and eighth lenses.

3. The large-aperture, small-volume optical imaging system according to claim 1, characterized in that, The following relationship must be satisfied: 1.90 ≤ f2 / (R2+R3) ≤ 3.45; and / or 2.80 ≤ |R15+R16| / |R15-R16| ≤ 5.65; Where f2 is the effective focal length of the second lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R15 is the radius of curvature of the object side of the eighth lens, and R16 is the radius of curvature of the image side of the eighth lens.

4. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that, The following relationship must be satisfied: 1.00 ≤ CT5 / T45 ≤ 3.10; and / or 2.50 ≤ |(DT31-DT32) / (DT21-DT22)| ≤ 4.25; and / or 12.65 ≤ DT71 / SAG13+DT72 / SAG14 ≤ 16.55; Wherein, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth and fifth lenses on the optical axis, DT31 is the maximum effective radius of the object side of the third lens, DT32 is the maximum effective radius of the image side of the third lens, DT21 is the maximum effective radius of the object side of the second lens, DT22 is the maximum effective radius of the image side of the second lens, DT71 is the maximum effective radius of the object side of the seventh lens, DT52 is the maximum effective radius of the image side of the seventh lens, SAG13 is the distance from the maximum effective aperture of the object side of the seventh lens to the intersection of the object side of the first lens with the optical axis—the distance parallel to the optical axis on the image side of the first lens, and SAG14 is the distance from the maximum effective aperture of the image side of the seventh lens to the intersection of the object side of the first lens with the optical axis—the distance parallel to the optical axis.

5. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that, The following relationship must be satisfied: 1.10 ≤ FOV / TTL / IamgH ≤ 1.25; Wherein, FOV is the maximum field of view of the optical imaging system, TTL is the on-axis 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.

6. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that, The following relationship must be satisfied: 5.40 ≤ f*tan(HFOV) / CT3 ≤ 7.65; Where f is the effective focal length of the optical imaging system, HFOV is the half field of view of the optical imaging system, and CT3 is the center thickness of the third lens on the optical axis.

7. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that, The following relationship must be satisfied: 2.85 ≤ f1*fno / f ≤ 3.56; Where f is the effective focal length of the optical imaging system, fno is the F-number of the optical imaging system, and f1 is the effective focal length of the first lens.

8. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that: The large aperture, small volume optical imaging system described above has a field of view of >89°, a total lens length of ≤11.3 mm, and an effective focal length of <7.12 mm.

9. The large-aperture, small-volume optical imaging system according to any one of claims 1-3, characterized in that: The aperture stop is located in front of the first lens or between the first and second lenses; and / or The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are all aspherical lenses, and are all separated by air gaps.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a large-aperture, small-volume optical imaging system as described in any one of claims 1-9.

Images