Camera lens

Abstract

The application relates to the field of optical technology and discloses a camera optical lens which is composed of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power and a seventh lens with negative refractive power; and the following relations are met: 5.00<=R13 / R14<=20.00; 0.03<=d2 / f<=0.07; 0.028<=d10 / TTL<=0.048. The camera optical lens has excellent optical characteristics and has the characteristics of large aperture, wide angle and ultra-thin, and is especially suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of a high-pixel camera component such as a CCD CMOS.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a camera optical lens. Background Technology

[0002] Camera optical lenses are widely used in mobile terminals, vehicle cameras, security monitoring, and other fields. With the continuous upgrading of the shooting performance requirements of smart mobile devices, existing camera optical lenses are no longer adequate for current market demands. Many existing camera optical lenses rely on increasing the number of lenses or the size of individual lenses to optimize image quality, which often results in a large overall optical length, conflicting with the slimming and miniaturization requirements of end products. Furthermore, due to limitations in optical structure design, existing camera optical lenses generally suffer from significant chromatic aberration, limiting image quality and making it difficult to simultaneously achieve product design specifications such as large aperture, ultra-thinness, and wide-angle capabilities. This hinders the widespread application of high-performance camera optical lenses in various scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide a camera optical lens that has good optical performance while meeting the design requirements of large aperture, ultra-thin design, and wide-angle lens.

[0004] To solve the above-mentioned technical problems, the embodiments of the present invention provide a camera optical lens, which is composed of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power arranged sequentially from the object side to the image side. Wherein, the central radius of curvature of the object-side surface of the seventh lens is R13, the central radius of curvature of the image-side surface of the seventh lens is R14, the axial distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, the axial distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is d10, the focal length of the imaging optical lens is f, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 5.00≤R13 / R14≤20.00; 0.03≤d² / f≤0.07; 0.028≤d10 / TTL≤0.048.

[0005] In some embodiments, the Abbe number of the first lens is vd1, and satisfies the following relationship: 60.00≤vd1≤82.00.

[0006] In some embodiments, the focal length of the third lens is f3, the central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, and the axial thickness of the third lens is d5, and satisfies the following relationship: -0.80≤f3 d5 / (R5+R6)≤-0.05.

[0007] In some embodiments, the object-side surface and image-side surface of the first lens are convex and concave near the optical axis, respectively; the focal length of the first lens is f1, the central radius of curvature of the object-side surface of the first lens is R1, the central radius of curvature of the image-side surface of the first lens is R2, and the axial thickness of the first lens is d1, satisfying the following relationship: -1.87≤(R1+R2) / (R1-R2)≤-1.65; 0.97≤f1 / f≤1.14; 0.098≤d1 / TTL≤0.137.

[0008] In some embodiments, the object-side and image-side surfaces of the second lens are convex and concave near the optical axis, respectively; the focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, and the axial thickness of the second lens is d3, satisfying the following relationship: 3.66≤(R3+R4) / (R3-R4)≤6.23; -6.01≤f² / f≤-3.60; 0.039≤d3 / TTL≤0.048.

[0009] In some embodiments, the object-side and image-side surfaces of the third lens are convex and concave near the optical axis, respectively; the focal length of the third lens is f3, the central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, and the axial thickness of the third lens is d5, and satisfies the following relationship: 1.20≤(R5+R6) / (R5-R6)≤5.27; -8.70≤f3 / f≤-3.65; 0.034≤d5 / TTL≤0.049.

[0010] In some embodiments, the object-side and image-side surfaces of the fourth lens are both convex near the optical axis; the focal length of the fourth lens is f4, the central radius of curvature of the object-side surface of the fourth lens is R7, the central radius of curvature of the image-side surface of the fourth lens is R8, and the axial thickness of the fourth lens is d7, and satisfies the following relationship: -0.91≤(R7+R8) / (R7-R8)≤-0.32; 4.06≤f4 / f≤4.90; 0.076≤d7 / TTL≤0.089.

[0011] In some embodiments, the object-side and image-side surfaces of the fifth lens are convex and concave near the optical axis, respectively; the focal length of the fifth lens is f5, the central radius of curvature of the object-side surface of the fifth lens is R9, the central radius of curvature of the image-side surface of the fifth lens is R10, and the axial thickness of the fifth lens is d9, satisfying the following relationship: 2.05≤(R9+R10) / (R9-R10)≤9.61; -10.76≤f5 / f≤-2.44; 0.055≤d9 / TTL≤0.065.

[0012] In some embodiments, the object-side and image-side surfaces of the sixth lens are both convex near the optical axis; the focal length of the sixth lens is f6, the central radius of curvature of the object-side surface of the sixth lens is R11, the central radius of curvature of the image-side surface of the sixth lens is R12, and the axial thickness of the sixth lens is d11, and satisfies the following relationship: -0.95≤(R11+R12) / (R11-R12)≤-0.77; 0.84≤f6 / f≤0.97; 0.072≤d11 / TTL≤0.098.

[0013] In some embodiments, the object-side and image-side surfaces of the seventh lens are convex and concave near the optical axis, respectively; the focal length of the seventh lens is f7, the axial thickness of the seventh lens is d13, and the following relationship is satisfied: 1.10≤(R13+R14) / (R13-R14)≤1.49; -0.79≤f7 / f≤-0.72; 0.066≤d13 / TTL≤0.071.

[0014] In some embodiments, the first lens is made of glass.

[0015] The beneficial effects of this invention are as follows: the camera optical lens according to this invention has excellent optical characteristics, and features a large aperture, wide angle, and ultra-thin design, making it particularly suitable for high-resolution CCDs. Mobile phone camera lens assemblies and web camera lenses are composed of imaging elements such as CMOS. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 4 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 8 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention; Figure 10 yes Figure 9 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 12 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 13 This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention; Figure 14 yes Figure 13 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 16 yes Figure 13A schematic diagram of axial aberrations of the camera optical lens is shown. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0019] Please see Figure 1 , Figure 5 , Figure 9 and Figure 13 The technical solution of the present invention provides a camera optical lens 10, 20, 30, 40, which is composed of a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power, arranged sequentially from the object side to the image side.

[0020] Define the central radius of curvature of the object-side surface of the seventh lens L7 as R13, the central radius of curvature of the image-side surface of the seventh lens L7 as R14, the axial distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 as d2, the axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6 as d10, the focal length of the imaging optical lenses 10, 20, 30, and 40 as f, and the total optical length of the imaging optical lenses 10, 20, 30, and 40 as TTL, and satisfy the following relationship: 5.00≤R13 / R14≤20.00(1) 0.03≤d2 / f≤0.07(2) 0.028≤d10 / TTL≤0.048(3) Condition (1) specifies the shape of the seventh lens L7. Within the range defined by condition (1), it is beneficial to correct off-axis aberrations under wide-angle conditions and improve the image quality at the edge of the image.

[0021] Condition (2) specifies the range of ratios between the on-axis distance d2 of the first lens L1 and the second lens L2 and the focal length f of the imaging optical lenses 10, 20, 30, and 40. Within the range defined by condition (2), the incident light can be guided to transition smoothly between the first lens L1 and the second lens L2, reducing the sensitivity of the imaging optical lenses 10, 20, 30, and 40, and ensuring that the imaging optical lenses 10, 20, 30, and 40 have excellent imaging performance.

[0022] Condition (3) specifies the range of ratios between the on-axis distance d10 of the fifth lens L5 and the sixth lens L6 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (3), the air gap ratio between the fifth lens L5 and the sixth lens L6 can be reasonably controlled to ensure a smooth transition of light between the fifth lens L5 and the sixth lens L6. It can also reduce the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, thus achieving the design requirements of ultra-thin miniaturization of the camera optical lenses 10, 20, 30, and 40.

[0023] The camera optical lenses 10, 20, 30, and 40 are arranged with alternating positive and negative refractive forces of the first lens L1 to the seventh lens L7. With the parameter constraints of conditional formulas (1), (2), and (3), the curvature ratio of the seventh lens L7 is optimized, the distance between the front group lenses (the front group lenses are the first lens L1 and the second lens L2) and the focal length of the lens are controlled, and the distance between the middle and rear group lenses (the middle group lenses are the third lens L3, the fourth lens L4, and the fifth lens L5, and the rear group lenses are the sixth lens L6 and the seventh lens L7) is limited relative to the total optical length. Various system aberrations such as chromatic aberration, field curvature, and astigmatism are corrected in a coordinated manner. While achieving large aperture and wide-angle imaging, the total optical length (TTL) of the camera optical lenses 10, 20, 30, and 40 is reduced. Overall, they can provide an optical camera lens with excellent optical performance, large aperture, wide angle and ultra-thin specifications.

[0024] The beneficial effects of the present invention are as follows: through the above-mentioned lens configuration, the camera optical lenses 10, 20, 30, and 40 have good optical performance while meeting the design requirements of large aperture, wide angle, and ultra-thin design; based on the characteristics of the camera optical lenses 10, 20, 30, and 40, the camera optical lenses 10, 20, 30, and 40 are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS, and other camera elements.

[0025] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0026] Define the Abbe number of the first lens L1 as vd1, and satisfy the following relationship: 60.00≤vd1≤82.00(4) Condition (4) specifies the range of Abbe number vd1 of the first lens L1. Within the range defined by condition (4), high Abbe number optical substrates can be reasonably selected, the dispersion ratio of camera optical lenses 10, 20, 30, and 40 can be optimized, the dispersion deviation can be offset by other lenses, the chromatic difference of camera optical lenses 10, 20, 30, and 40 can be efficiently corrected, and the chromatic difference can be controlled within |LC|≤4.0μm.

[0027] Define the focal length of the third lens L3 as f3, the central radius of curvature of the object side of the third lens L3 as R5, the central radius of curvature of the image side of the third lens L3 as R6, and the on-axis thickness of the third lens L3 as d5, and satisfy the following relationship: -0.80≤f3 d5 / (R5+R6)≤-0.05(5) Condition (5) specifies the shape of the third lens L3. Within the range defined by condition (5), it can effectively correct the off-axis field aberration of the camera optical lenses 10, 20, 30, and 40 in wide-angle conditions and improve the imaging quality of the edge field of view.

[0028] The object-side and image-side surfaces of the first lens L1 are convex and concave near the optical axis, respectively. The focal length of the first lens L1 is defined as f1, the central radius of curvature of the object-side surface of the first lens L1 is R1, the central radius of curvature of the image-side surface of the first lens L1 is R2, and the axial thickness of the first lens L1 is d1, satisfying the following relationship: -1.87≤(R1+R2) / (R1-R2)≤-1.65(6) 0.97≤f1 / f≤1.14(7) 0.098≤d1 / TTL≤0.137(8) Condition (6) specifies the shape of the first lens L1. Within the range defined by condition (6), the incident beam can be smoothly converged, so that the first lens L1 can effectively correct the spherical aberration of the system.

[0029] Condition (7) specifies the range of the ratio between the focal length f1 of the first lens L1 and the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (7), the refractive power of the first lens L1 can be reasonably distributed, and the first lens L1 can bear a moderate refractive load, avoiding the aberration surge caused by excessive refractive power of a single lens, which facilitates the implementation of a large aperture design, while optimizing the initial convergence effect of the incident beam and reducing the aberration correction pressure of subsequent lens groups.

[0030] Condition (8) specifies the range of ratios between the axial thickness d1 of the first lens L1 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (8), the first lens L1 can be guaranteed to have sufficient lens thickness to meet the requirements of injection molding and assembly processes. At the same time, the first lens L1 can avoid being too thick and occupying the lens group arrangement space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, and shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. This is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0031] The object-side and image-side surfaces of the second lens L2 are convex and concave near the optical axis, respectively. The focal length of the second lens L2 is defined as f2, the central radius of curvature of the object-side surface of the second lens L2 is R3, the central radius of curvature of the image-side surface of the second lens L2 is R4, and the axial thickness of the second lens L2 is d3, satisfying the following relationship: 3.66≤(R3+R4) / (R3-R4)≤6.23(9) -6.01≤f2 / f≤-3.60(10) 0.039≤d3 / TTL≤0.048(11) Condition (9) specifies the shape of the second lens L2. Within the range defined by condition (9), the ray refraction trajectory can be regulated, effectively suppressing the spherical aberration and coma generated by the front group, reducing the residual aberration at the front end, and reducing the aberration correction load of the rear lens. This is beneficial for the camera optical lenses 10, 20, 30, and 40 to achieve the design requirements of wide-angle.

[0032] Condition (10) specifies the range of the ratio between the focal length f2 of the second lens L2 and the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (10), the magnitude of the negative refractive power of the second lens L2 can be precisely controlled, forming a chromatic aberration complementary match with the positive refractive power of the first lens L1, effectively correcting the axial chromatic aberration of the system, while reasonably distributing the refractive load of the system, suppressing off-axis aberrations generated under wide angle, and optimizing the overall imaging quality.

[0033] Condition (11) specifies the range of the ratio between the axial thickness d3 of the second lens L2 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (11), it can ensure that the second lens L2 has sufficient lens thickness to meet the requirements of injection molding and assembly processes, and avoid the second lens L2 being too thick and occupying the lens group arrangement space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, which is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0034] The object-side and image-side surfaces of the third lens L3 are convex and concave near the optical axis, respectively. The focal length of the third lens L3 is defined as f3, the central radius of curvature of the object-side surface is R5, the central radius of curvature of the image-side surface is R6, and the on-axis thickness of the third lens L3 is d5, satisfying the following relationship: 1.20≤(R5+R6) / (R5-R6)≤5.27(12) -8.70≤f3 / f≤-3.65(13) 0.034≤d5 / TTL≤0.049(14) Condition (12) specifies the shape of the third lens L3. Within the range defined by condition (12), it can regulate the light refraction direction of the middle group optical path, suppress the generation of spherical aberration and coma, reduce the residual aberration in the middle section, reduce the aberration correction pressure of subsequent lenses, and adapt to the optical path arrangement requirements of wide-angle imaging.

[0035] Condition (13) specifies the range of the ratio between the focal length f3 of the third lens L3 and the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (13), the magnitude of the negative refractive power of the third lens L3 can be precisely controlled, forming a dispersion compensation pair with the positive refractive power lens of the fourth lens L4, effectively correcting the axial chromatic aberration of the system, while distributing the overall refractive burden, improving off-axis aberration in wide-angle mode, and enhancing the imaging quality of the entire field of view.

[0036] Condition (14) specifies the range of the ratio between the on-axis thickness d5 of the third lens L3 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (14), it can ensure that the third lens L3 has sufficient lens thickness to meet the requirements of injection molding and assembly processes, and avoid the third lens L3 being too thick and encroaching on the lens group layout space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, which is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0037] The object-side and image-side surfaces of the fourth lens L4 are convex near the optical axis. The focal length of the fourth lens L4 is defined as f4, the central radius of curvature of the object-side surface is R7, the central radius of curvature of the image-side surface is R8, and the on-axis thickness of the fourth lens L4 is d7, satisfying the following relationship: -0.91≤(R7+R8) / (R7-R8)≤-0.32(15) 4.06≤f4 / f≤4.90(16) 0.076≤d7 / TTL≤0.089(17) Condition (15) specifies the shape of the fourth lens L4. Within the range defined by condition (15), the light bending path of the middle lens can be optimized, effectively reducing spherical aberration and coma, optimizing the matching degree of the middle optical path, reducing the aberration correction load of subsequent lenses, and adapting to the needs of wide-angle imaging.

[0038] Condition (16) specifies the range of the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (16), the positive refractive power of the fourth lens L4 can be reasonably adjusted, and it can cooperate with the surrounding negative refractive power lenses to achieve dispersion compensation, improve the chromatic aberration of the system, share the task of optical path convergence, suppress off-axis aberrations, and improve the uniformity of imaging across the entire field of view.

[0039] Condition (17) specifies the range of the ratio between the on-axis thickness d7 of the fourth lens L4 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (17), it can ensure that the fourth lens L4 has sufficient lens thickness to meet the requirements of injection molding and assembly processes, and avoid the fourth lens L4 being too thick and occupying the lens group arrangement space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, which is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0040] The object-side and image-side surfaces of the fifth lens L5 are convex and concave near the optical axis, respectively. The focal length of the fifth lens L5 is defined as f5, the central radius of curvature of its object-side surface is R9, the central radius of curvature of its image-side surface is R10, and its on-axis thickness is d9, satisfying the following relationship: 2.05≤(R9+R10) / (R9-R10)≤9.61(18) -10.76≤f5 / f≤-2.44(19) 0.055≤d9 / TTL≤0.065(20) Condition (18) specifies the shape of the fifth lens L5. Within the range defined by condition (18), the refraction direction of the middle and rear group beams can be optimized, effectively suppressing spherical aberration and coma, reducing residual aberration in the middle section, reducing the aberration correction burden of the rear group lens, and adapting to the optical path correction requirements of wide-angle lenses.

[0041] Condition (19) specifies the range of the ratio between the focal length f5 of the fifth lens L5 and the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (19), the negative refractive power of the fifth lens L5 can be reasonably adjusted, which can form a dispersion complementary configuration with the adjacent positive refractive power lens, effectively correct the axial and transverse chromatic aberration of the system, and at the same time disperse the incident beam at the edge of the wide-angle lens, suppress distortion and off-axis aberration, and optimize the imaging effect of the entire field of view.

[0042] Condition (20) specifies the range of ratios between the on-axis thickness d9 of the fifth lens L5 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (20), the fifth lens L5 can be guaranteed to have sufficient lens thickness to meet the requirements of injection molding and assembly processes. At the same time, the fifth lens L5 can avoid being too thick and encroaching on the lens group layout space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, and shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. This is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0043] The object-side and image-side surfaces of the sixth lens L6 are convex near the optical axis. The focal length of the sixth lens L6 is defined as f6, the central radius of curvature of the object-side surface of the sixth lens L6 is R11, the central radius of curvature of the image-side surface of the sixth lens L6 is R12, and the on-axis thickness of the sixth lens L6 is d11, satisfying the following relationship: -0.95≤(R11+R12) / (R11-R12)≤-0.77(21) 0.84≤f6 / f≤0.97(22) 0.072≤d11 / TTL≤0.098(23) Condition (21) specifies the shape of the sixth lens L6. Within the range defined by condition (21), the refraction direction of the rear group of light can be regulated, effectively correcting the residual spherical aberration and coma of the system, optimizing the edge field of view optical path, reducing the aberration correction pressure of the seventh lens L7, and meeting the imaging correction requirements of wide-angle lenses.

[0044] Condition (22) specifies the range of the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (22), the positive refractive power of the sixth lens L6 can be reasonably controlled, and it can cooperate with the peripheral negative refractive power lenses to achieve dispersion compensation, correct residual chromatic aberration, converge the imaging beam, improve edge field distortion, and enhance the uniformity of the full field of view imaging.

[0045] Condition (23) specifies the range of the ratio between the axial thickness d11 of the sixth lens L6 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (23), it can ensure that the sixth lens L6 has sufficient lens thickness to meet the requirements of injection molding and assembly processes, and avoid the sixth lens L6 being too thick and occupying the lens group layout space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, which is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0046] The object-side and image-side surfaces of the seventh lens L7 are convex and concave near the optical axis, respectively. The focal length of the seventh lens L7 is defined as f7, and its on-axis thickness is d13, satisfying the following relationship: 1.10≤(R13+R14) / (R13-R14)≤1.49(24) -0.79≤f7 / f≤-0.72(25) 0.066≤d13 / TTL≤0.071(26) Condition (24) specifies the shape of the seventh lens L7. Within the range defined by condition (24), the refraction direction of the end light can be optimized, the spherical aberration and edge field coma left by the whole system can be effectively corrected, the wide-angle distortion problem of the lens can be improved, the light can be smoothly transferred to the photosensitive chip, and the uniformity of the whole field of view imaging can be improved.

[0047] Condition (25) specifies the range of the ratio between the focal length f7 of the seventh lens L7 and the focal length f of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (25), the negative refractive power of the seventh lens L7 can be reasonably controlled, and it can be combined with the refractive power of the adjacent lens on the front side to compensate for residual dispersion and correct the residual transverse chromatic aberration. At the same time, it optimizes the beam convergence state of the edge field of view, suppresses the distortion at the end of the wide-angle, and ensures the imaging quality of the light incident on the photosensitive element.

[0048] Condition (26) specifies the range of the ratio between the axial thickness d13 of the seventh lens L7 and the total optical length TTL of the camera optical lenses 10, 20, 30, and 40. Within the range defined by condition (26), it can ensure that the seventh lens L7 has sufficient lens thickness to meet the requirements of injection molding and assembly processes, and avoid the seventh lens L7 being too thick and occupying the lens group layout space, saving the axial space of the camera optical lenses 10, 20, 30, and 40, shortening the total optical length TTL of the camera optical lenses 10, 20, 30, and 40, which is conducive to realizing the miniaturization design of the camera optical lenses 10, 20, 30, and 40.

[0049] In this invention, the first lens L1 is made of glass, while the second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7 are all made of plastic. In other alternative designs, the lenses can also be made of other materials.

[0050] In this invention, the apertures ST of the camera optical lenses 10, 20, 30, and 40 are disposed on the object-side surface of the first lens L1. However, the apertures ST are not limited to the object-side surface of the first lens L1 and can also be disposed in other positions. Furthermore, an optical element such as an optical filter GF is disposed between the seventh lens L7 and the imaging plane Si. The optical filter GF can be a glass cover or an optical filter. In other optional embodiments, the optical filter GF can also be disposed in other positions.

[0051] The following examples illustrate the camera optical lenses 10, 20, 30, and 40 of the present invention. The symbols described in each example are as follows, and the units for focal length, on-axis distance, radius of curvature, and on-axis thickness are millimeters.

[0052] TTL: Total optical length (the axial distance from the object surface of the first lens L1 to the imaging surface Si), in millimeters; Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens; Image height IH of 1.0 field of view: The field of view height corresponding to the effective pixel of the sensor (i.e., half the diagonal length of the effective pixel area of ​​the sensor), in millimeters; 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor, in degrees; Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviations, in millimeters; MIC field of view angle FOVm: The field of view angle corresponding to the image height of the MIC field of view, in degrees.

[0053] The technical solution of the present invention will be described in detail below with four embodiments. The technical effects of the present invention cannot be achieved when the above-described conditions are not met.

[0054] First implementation method: The first lens L1 has positive refractive power, and its object-side surface near the optical axis is convex, while its image-side surface near the optical axis is concave. The second lens L2 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The third lens L3 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The fourth lens L4 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifth lens L5 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The sixth lens L6 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The seventh lens L7 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave.

[0055] Figure 1 This is a schematic diagram of the camera optical lens 10 in the first embodiment. The following shows the design data of the camera optical lens 10 in the first embodiment of the present invention.

[0056] Table 1 lists the central radius of curvature R of the object-side and image-side surfaces of the first lens L1 to the seventh lens L7 constituting the imaging optical lens 10 in the first embodiment of the present invention, the on-axis thickness of the lens, the on-axis distance d between the lenses, the refractive index nd, and the Abbe number vd. It should be noted that in this embodiment, the units of distance, radius, and thickness are all millimeters (mm).

[0057] Table 1

[0058] The meanings of the symbols in the table above are as follows.

[0059] R: Radius of curvature at the center of the optical surface; ST: Aperture; R1: The central radius of curvature of the object-side surface of the first lens L1; R2: The central radius of curvature of the image-side surface of the first lens L1; R3: The central radius of curvature of the object-side surface of the second lens L2; R4: The central radius of curvature of the image-side surface of the second lens L2; R5: The central radius of curvature of the object-side surface of the third lens L3; R6: The central radius of curvature of the image-side surface of the third lens L3; R7: The central radius of curvature of the object side surface of the fourth lens L4; R8: The central radius of curvature of the image-side surface of the fourth lens L4; R9: The central radius of curvature of the object-side surface of the fifth lens L5; R10: The central radius of curvature of the image-side surface of the fifth lens L5; R11: The central radius of curvature of the object-side surface of the sixth lens L6; R12: The central radius of curvature of the image-side surface of the sixth lens L6; R13: The central radius of curvature of the object-side surface of the seventh lens L7; R14: The central radius of curvature of the image-side surface of the seventh lens L7; R15: The center radius of curvature of the object side surface of the optical filter GF; R16: Radius of curvature of the center of the image side of the optical filter GF; d: Axial thickness of the lens, axial distance between lenses; d0: The on-axis distance from the aperture ST to the object-side surface of the first lens L1; d1: On-axis thickness of the first lens L1; d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2; d3: On-axis thickness of the second lens L2; d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3; d5: On-axis thickness of the third lens L3; d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4; d7: On-axis thickness of the fourth lens L4; d8: The on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5; d9: On-axis thickness of the fifth lens L5; d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6; d11: On-axis thickness of the sixth lens L6; d12: The axial distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7; d13: On-axis thickness of the seventh lens L7; d14: The on-axis distance from the image side of the seventh lens L7 to the object side of the optical filter GF; d15: On-axis thickness of the optical filter GF; d16: The on-axis distance from the image-side surface of the optical filter GF to the imaging plane Si; nd: Refractive index of the d-line (wavelength of the d-line is 587.56 nm); nd1: The refractive index of the d-line of the first lens L1; nd2: The refractive index of the d-line of the second lens L2; nd3: The refractive index of the d-line of the third lens L3; nd4: The refractive index of the d-line of the fourth lens L4; nd5: The refractive index of the d-line of the fifth lens L5; nd6: The refractive index of the d-line of the sixth lens L6; nd7: The refractive index of the d-line of the seventh lens L7; ndg: The refractive index of the d-line of the optical filter GF; vd: Abbe number; vd1: Abbe number of the first lens L1; vd2: Abbe number of the second lens L2; vd3: Abbe number of the third lens L3; vd4: Abbe number of the fourth lens L4; vd5: Abbe number of the fifth lens L5; vd6: Abbe number of the sixth lens L6; vd7: Abbe number of the seventh lens L7; vdg: Abbe number of the GF of the optical filter.

[0060] Table 2 lists the conic coefficient k and aspherical coefficient of the camera optical lens 10 according to the first embodiment of the present invention.

[0061] Table 2

[0062] It should be noted that the aspherical surface of each lens in this embodiment uses the aspherical surface shown in the following conditional expression (27). However, the specific form of the following conditional expression (27) is only an example. In fact, the present invention is not limited to the aspherical polynomial form indicated in conditional expression (27).

[0063] z=(c 2 / r) / {1+[1-(k+1)(c 2 / r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 + A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (27) Where k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspherical coefficients. c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point r on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis).

[0064] In addition, Table 9 below lists the values ​​of various parameters and the parameters specified in the conditional expressions in the first embodiment.

[0065] Figure 2 A schematic diagram of field curvature and distortion of light with a wavelength of 550 nanometers after passing through the camera optical lens 10 of the first embodiment is shown. The field curvature S is the field curvature in the sagittal direction and T is the field curvature in the meridional direction. Figure 3 A schematic diagram of magnification chromatic aberration is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 10 of the first embodiment. Figure 4 A schematic diagram of axial aberrations is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 10 of the first embodiment.

[0066] As shown in Table 9, the first embodiment satisfies all the conditional expressions.

[0067] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 3.814 mm, the image height IH of the 1.0 field of view is 6.246 mm, the field of view FOV of the 1.0 field of view is 85.34°, the image height IHm of the MIC field of view is 6.556 mm, and the field of view FOVm of the MIC field of view is 88.42°. The camera optical lens 10 meets the characteristics of having a large aperture, being ultra-thin, and having a wide angle. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical performance.

[0068] Second Implementation Method The first lens L1 has positive refractive power, and its object-side surface near the optical axis is convex, while its image-side surface near the optical axis is concave. The second lens L2 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The third lens L3 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The fourth lens L4 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifth lens L5 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The sixth lens L6 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The seventh lens L7 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave.

[0069] Figure 5 This is a schematic diagram of the camera optical lens 20 in the second embodiment. The second embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences are listed below.

[0070] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0071] Table 3

[0072] Table 4

[0073] In addition, Table 9 below lists the values ​​of various parameters and the parameters specified in the conditional expressions in the second embodiment.

[0074] Figure 6 A schematic diagram of field curvature and distortion of light with a wavelength of 550 nanometers after passing through the camera optical lens 20 of the second embodiment is shown. Field curvature S is the field curvature in the sagittal direction and T is the field curvature in the meridional direction. Figure 7 A schematic diagram of magnification chromatic aberration is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 20 of the second embodiment. Figure 8 A schematic diagram of axial aberrations is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 20 of the second embodiment.

[0075] As shown in Table 9, the second embodiment satisfies all the conditional expressions.

[0076] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 6.009 mm, the image height IH of the 1.0 field of view is 6.246 mm, the field of view FOV of the 1.0 field of view is 58.32°, the image height IHm of the MIC field of view is 6.556 mm, and the field of view FOVm of the MIC field of view is 60.66°. The camera optical lens 20 meets the characteristics of having a large aperture, being ultra-thin, and having a wide angle. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical performance.

[0077] Third Implementation Method The first lens L1 has positive refractive power, and its object-side surface near the optical axis is convex, while its image-side surface near the optical axis is concave. The second lens L2 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The third lens L3 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The fourth lens L4 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifth lens L5 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The sixth lens L6 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The seventh lens L7 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave.

[0078] Figure 9 This is a schematic diagram of the camera optical lens 30 in the third embodiment. The third embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences are listed below.

[0079] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0080] Table 5

[0081] Table 6

[0082] In addition, Table 9 below lists the values ​​of various parameters and the parameters specified in the conditional expressions in the third embodiment.

[0083] Figure 10A schematic diagram of field curvature and distortion of light with a wavelength of 550 nanometers after passing through the camera optical lens 30 of the third embodiment is shown. Field curvature S is the field curvature in the sagittal direction and T is the field curvature in the meridional direction. Figure 11 A schematic diagram of magnification chromatic aberration is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 30 of the third embodiment. Figure 12 A schematic diagram of axial aberrations is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 30 of the third embodiment.

[0084] As shown in Table 9, the third embodiment satisfies all the conditional expressions.

[0085] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 4.302 mm, the image height IH of the 1.0 field of view is 6.246 mm, the field of view FOV of the 1.0 field of view is 78.67°, the image height IHm of the MIC field of view is 6.556 mm, and the field of view FOVm of the MIC field of view is 81.70°. The camera optical lens 30 meets the characteristics of having a large aperture, being ultra-thin, and having a wide angle. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical performance.

[0086] Fourth Implementation Method The first lens L1 has positive refractive power, and its object-side surface near the optical axis is convex, while its image-side surface near the optical axis is concave. The second lens L2 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The third lens L3 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The fourth lens L4 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The fifth lens L5 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave. The sixth lens L6 has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The seventh lens L7 has negative refractive power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave.

[0087] Figure 13 This is a schematic diagram of the camera optical lens 40 in the fourth embodiment. The fourth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as in the first embodiment. Only the differences are listed below.

[0088] Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0089] Table 7

[0090] Table 8

[0091] In addition, Table 9 below lists the values ​​of various parameters and the parameters specified in the conditional expressions in the fourth embodiment.

[0092] Figure 14 A schematic diagram showing the field curvature and distortion of light with a wavelength of 550 nanometers after passing through the camera optical lens 40 of the fourth embodiment is shown. Figure 15 A schematic diagram of magnification chromatic aberration is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 40 of the fourth embodiment. Figure 16 A schematic diagram of axial aberrations is shown after light with wavelengths of 470 nm, 510 nm, 550 nm, 610 nm, and 650 nm passes through the camera optical lens 40 of the fourth embodiment.

[0093] As shown in Table 9, the fourth embodiment satisfies all the conditional expressions.

[0094] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 5.317 mm, the image height IH of the 1.0 field of view is 6.246 mm, the field of view FOV of the 1.0 field of view is 69.02°, the image height IHm of the MIC field of view is 6.556 mm, and the field of view FOVm of the MIC field of view is 72.31°. The camera optical lens 40 meets the characteristics of having a large aperture, being ultra-thin, and having a wide angle. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical performance.

[0095] Table 9

[0096] The camera optical lens provided by the embodiments of the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The above description of the embodiments is only for the purpose of helping to understand the idea of ​​the present invention. There may be changes in the specific implementation and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A camera optical lens, characterized in that, The camera optical lens is composed of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, arranged sequentially from the object side to the image side. Wherein, the central radius of curvature of the object-side surface of the seventh lens is R13, the central radius of curvature of the image-side surface of the seventh lens is R14, the axial distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, the axial distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is d10, the focal length of the imaging optical lens is f, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 5.00≤R13 / R14≤20.00; 0.03≤d² / f≤0.07; 0.028≤d10 / TTL≤0.

048.

2. The camera optical lens according to claim 1, characterized in that, The Abbe number of the first lens is vd1, and it satisfies the following relationship: 60.00≤vd1≤82.

00.

3. The camera optical lens according to claim 1, characterized in that, The third lens has a focal length of f3, a central radius of curvature of the object-side surface of the third lens of R5, a central radius of curvature of the image-side surface of the third lens of R6, and an axial thickness of d5, and satisfies the following relationship: -0.80≤f3 d5 / (R5+R6)≤-0.05。 4. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the first lens are convex and concave near the optical axis, respectively; the focal length of the first lens is f1, the central radius of curvature of the object-side surface is R1, the central radius of curvature of the image-side surface is R2, and the axial thickness of the first lens is d1, satisfying the following relationship: -1.87≤(R1+R2) / (R1-R2)≤-1.65; 0.97≤f1 / f≤1.14; 0.098≤d1 / TTL≤0.

137.

5. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the second lens are convex and concave near the optical axis, respectively; the focal length of the second lens is f2, the central radius of curvature of the object-side surface is R3, the central radius of curvature of the image-side surface is R4, and the axial thickness of the second lens is d3, satisfying the following relationship: 3.66≤(R3+R4) / (R3-R4)≤6.23; -6.01≤f² / f≤-3.60; 0.039≤d3 / TTL≤0.

048.

6. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the third lens are convex and concave near the optical axis, respectively; the focal length of the third lens is f3, the central radius of curvature of the object-side surface is R5, the central radius of curvature of the image-side surface is R6, and the axial thickness of the third lens is d5, satisfying the following relationship: 1.20≤(R5+R6) / (R5-R6)≤5.27; -8.70≤f3 / f≤-3.65; 0.034≤d5 / TTL≤0.

049.

7. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the fourth lens are both convex near the optical axis; the focal length of the fourth lens is f4, the central radius of curvature of the object-side surface is R7, the central radius of curvature of the image-side surface is R8, and the axial thickness of the fourth lens is d7, satisfying the following relationship: -0.91≤(R7+R8) / (R7-R8)≤-0.32; 4.06≤f4 / f≤4.90; 0.076≤d7 / TTL≤0.

089.

8. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the fifth lens are convex and concave near the optical axis, respectively; the focal length of the fifth lens is f5, the central radius of curvature of the object-side surface is R9, the central radius of curvature of the image-side surface is R10, and the axial thickness of the fifth lens is d9, satisfying the following relationship: 2.05≤(R9+R10) / (R9-R10)≤9.61; -10.76≤f5 / f≤-2.44; 0.055≤d9 / TTL≤0.

065.

9. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the sixth lens are both convex near the optical axis; the focal length of the sixth lens is f6, the central radius of curvature of the object-side surface is R11, the central radius of curvature of the image-side surface is R12, and the axial thickness of the sixth lens is d11, satisfying the following relationship: -0.95≤(R11+R12) / (R11-R12)≤-0.77; 0.84≤f6 / f≤0.97; 0.072≤d11 / TTL≤0.

098.

10. The camera optical lens according to claim 1, characterized in that, The object-side and image-side surfaces of the seventh lens are convex and concave near the optical axis, respectively; the focal length of the seventh lens is f7, and the axial thickness of the seventh lens is d13, satisfying the following relationship: 1.10≤(R13+R14) / (R13-R14)≤1.49; -0.79≤f7 / f≤-0.72; 0.066≤d13 / TTL≤0.

071.

11. The camera optical lens according to claim 1, characterized in that, The first lens is made of glass.

Images