Camera lens

Abstract

The application provides a camera optical lens, which comprises, in sequence from an object side to an image side, 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; the first lens has negative refractive power; a field of view of the camera optical lens is FOV, a focal length of the fourth lens is f4, a focal length of the fifth lens is f5, an axial distance from an image side surface of the fifth lens to an object side surface of the sixth lens is d10, an axial distance from an image side surface of the sixth lens to an object side surface of the seventh lens is d12, and the following relationships are met: 100.00°≤FOV≤135.00°; -1.50≤f4 / f5<0; 1.30≤d10 / d12≤7.80. The camera optical lens has good optical performance and meets the design requirements of wide-angle and ultra-thin.

Description

[Technical Field]

[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for handheld terminal devices such as smartphones and digital cameras, as well as camera devices such as monitors and PC lenses. [Background Technology]

[0002] In recent years, with the rise of smartphones, the demand for miniaturized camera lenses has been increasing. The photosensitive devices of general camera lenses are nothing more than charge-coupled devices (CCD) or complementary metal-oxide semiconductor sensors (CMOS sensors). Due to the advancement of semiconductor manufacturing technology, the pixel size of photosensitive devices has been reduced. In addition, the current trend of electronic products is to have good functions and a thin and small shape. Therefore, miniaturized camera lenses with good image quality have become the mainstream in the market.

[0003] To achieve better image quality, traditional lenses used in mobile phone cameras often employ three-element, four-element, or even five-element or six-element lens structures. However, with technological advancements and increasing user demands, as the pixel area of ​​image sensors continues to shrink and system requirements for image quality rise, eight-element lens structures have gradually emerged in lens designs. While common eight-element lenses already possess good optical performance, their optical power, lens spacing, and lens shape still exhibit certain limitations. This results in the lens structure, while offering good optical performance, failing to meet the design requirements for wide-angle and ultra-thin lenses.

[0004] Therefore, it is necessary to provide a camera optical lens with good optical performance that meets the requirements of wide-angle and ultra-thin design. [Summary of the Invention]

[0005] To address the aforementioned problems, the present invention aims to provide a camera optical lens that possesses excellent optical performance while meeting the design requirements of wide-angle and ultra-thin design.

[0006] The technical solution of the present invention is as follows: a camera optical lens, wherein the camera optical lens comprises, from the object side to the image side, 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; the first lens has negative refractive power;

[0007] The field of view of the camera optical lens is FOV, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the axial distance from the image side of the fifth lens to the object side of the sixth lens is d10, and the axial distance from the image side of the sixth lens to the object side of the seventh lens is d12, and the following relationships are satisfied: 100.00°≤FOV≤135.00°; -1.50≤f4 / f5<0; 1.30≤d10 / d12≤7.80.

[0008] Preferably, the central radius of curvature of the object side of the eighth lens is R15, and the central radius of curvature of the image side of the eighth lens is R16, and the following relationship is satisfied: 1.70≤(R15+R16) / (R15-R16)≤7.60.

[0009] Preferably, the object-side surface of the first lens is concave near the axis, and the image-side surface of the first lens is concave near the axis; the focal length of the imaging optical lens is f, 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, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationships: -6.37≤f1 / f≤-0.72; 0.21≤(R1+R2) / (R1-R2)≤1.40; 0.03≤d1 / TTL≤0.10.

[0010] Preferably, the camera optical lens satisfies the following relationships: -3.98≤f1 / f≤-0.91; 0.34≤(R1+R2) / (R1-R2)≤1.12; 0.04≤d1 / TTL≤0.08.

[0011] Preferably, the second lens has positive refractive power, the object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position; the focal length of the camera optical lens is f, 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, the axial thickness of the second lens is d3, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: 0.90≤f2 / f≤6.47; -8.63≤(R3+R4) / (R3-R4)≤-1.58; 0.02≤d3 / TTL≤0.17.

[0012] Preferably, the camera optical lens satisfies the following relationships: 1.44≤f2 / f≤5.18; -5.39≤(R3+R4) / (R3-R4)≤-1.97; 0.04≤d3 / TTL≤0.13.

[0013] Preferably, the third lens has positive refractive power, and the object-side surface of the third lens is convex at the paraxial position; the focal length of the imaging optical lens is f, 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, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationships: 0.72≤f3 / f≤15.92; -16.10≤(R5+R6) / (R5-R6)≤-0.41; 0.02≤d5 / TTL≤0.11.

[0014] Preferably, the camera optical lens satisfies the following relationships: 1.15≤f3 / f≤12.74; -10.06≤(R5+R6) / (R5-R6)≤-0.51; 0.04≤d5 / TTL≤0.09.

[0015] Preferably, the fourth lens has positive refractive power, and the image-side surface of the fourth lens is convex at the paraxial position; the focal length of the camera optical lens is f, 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, the axial thickness of the fourth lens is d7, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: 0.57≤f4 / f≤5.27; 0.09≤(R7+R8) / (R7-R8)≤4.11; 0.02≤d7 / TTL≤0.15.

[0016] Preferably, the camera optical lens satisfies the following relationships: 0.91≤f4 / f≤4.22; 0.14≤(R7+R8) / (R7-R8)≤3.29; 0.04≤d7 / TTL≤0.12.

[0017] Preferably, the fifth lens has negative refractive power; the focal length of the imaging optical lens is f, the central radius of curvature of the object side of the fifth lens is R9, the central radius of curvature of the image side of the fifth lens is R10, the axial thickness of the fifth lens is d9, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationships: -252.10≤f5 / f≤-1.29; -52.75≤(R9+R10) / (R9-R10)≤3.34; 0.02≤d9 / TTL≤0.07.

[0018] Preferably, the camera optical lens satisfies the following relationships: -157.56≤f5 / f≤-1.61; -32.97≤(R9+R10) / (R9-R10)≤2.67; 0.03≤d9 / TTL≤0.06.

[0019] Preferably, the sixth lens has negative refractive power; the focal length of the camera optical lens is f, the focal length of the sixth lens is f6, the central radius of curvature of the object side of the sixth lens is R11, the central radius of curvature of the image side of the sixth lens is R12, the axial thickness of the sixth lens is d11, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: -11.31≤f6 / f≤-1.13; -5.32≤(R11+R12) / (R11-R12)≤1.62; 0.02≤d11 / TTL≤0.06.

[0020] Preferably, the camera optical lens satisfies the following relationships: -7.07≤f6 / f≤-1.41; -3.33≤(R11+R12) / (R11-R12)≤1.29; 0.03≤d11 / TTL≤0.05.

[0021] Preferably, the seventh lens has positive refractive power, and the image-side surface of the seventh lens is convex at the paraxial position; the focal length of the camera optical lens is f, the focal length of the seventh lens is f7, 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 thickness of the seventh lens is d13, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: 0.27≤f7 / f≤2.73; -0.38≤(R13+R14) / (R13-R14)≤1.75; 0.07≤d13 / TTL≤0.31.

[0022] Preferably, the camera optical lens satisfies the following relationships: 0.42≤f7 / f≤2.19; -0.24≤(R13+R14) / (R13-R14)≤1.40; 0.12≤d13 / TTL≤0.24.

[0023] Preferably, the eighth lens has negative refractive power, the object-side surface of the eighth lens is convex at the paraxial position, and the image-side surface of the eighth lens is concave at the paraxial position; the focal length of the camera optical lens is f, the focal length of the eighth lens is f8, the on-axis thickness of the eighth lens is d15, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: -25.88≤f8 / f≤-0.49; 0.04≤d15 / TTL≤0.14.

[0024] Preferably, the camera optical lens satisfies the following relationships: -16.17≤f8 / f≤-0.61; 0.07≤d15 / TTL≤0.11.

[0025] Preferably, the total optical length of the camera lens is TTL, and the image height of the camera lens is IH, satisfying the following relationship: TTL / IH≤2.10.

[0026] The beneficial effects of this invention are as follows:

[0027] The camera optical lens of the present invention has excellent optical characteristics, and is characterized by wide-angle and ultra-thin design. It is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. [Attached Image Description]

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A schematic diagram of axial aberrations of a camera optical lens is shown.

[0031] Figure 3 yes Figure 1 The diagram shows the magnification chromatic aberration of the camera optical lens.

[0032] Figure 4 yes Figure 1 The diagram shows the field curvature and distortion of the camera lens.

[0033] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0034] Figure 6 yes Figure 5 A schematic diagram of axial aberrations of a camera optical lens is shown.

[0035] Figure 7 yes Figure 5 The diagram shows the magnification chromatic aberration of the camera optical lens.

[0036] Figure 8 yes Figure 5 The diagram shows the field curvature and distortion of the camera lens.

[0037] Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0038] Figure 10 yes Figure 9 A schematic diagram of axial aberrations of a camera optical lens is shown.

[0039] Figure 11 yes Figure 9 The diagram shows the magnification chromatic aberration of the camera optical lens.

[0040] Figure 12 yes Figure 9 The diagram shows the field curvature and distortion of the camera lens. 【Detailed Implementation Methods】

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this 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 provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0043] (First Implementation)

[0044] Referring to the accompanying drawings, the present invention provides a camera optical lens 10. Figure 1 The image shown is a camera optical lens 10 according to the first embodiment of the present invention. Figure 1 In the image, the left side is the object side and the right side is the image side. The camera optical lens 10 includes eight lenses, which are arranged from the object side to the image side as follows: first lens L1, aperture S1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. Optical elements such as an optical filter GF can be disposed between the eighth lens L8 and the image plane Si.

[0045] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all made of plastic. In other embodiments, the lenses may be made of other materials.

[0046] In this embodiment, the first lens L1 has negative refractive power, which helps to improve the performance of the optical system.

[0047] In this embodiment, the field of view of the camera optical lens 10 is defined as FOV, the focal length of the fourth lens L4 is f4, the focal length of the fifth lens L5 is f5, the axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6 is d10, and the axial distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7 is d12, and the following relationship is satisfied:

[0048] 100.00°≤FOV≤135.00° (1)

[0049] -1.50≤f4 / f5<0 (2)

[0050] 1.30≤d10 / d12≤7.80 (3)

[0051] Among them, condition (1) specifies the range of field of view (FOV), and an optical system that satisfies the condition has a wide-angle feature.

[0052] Condition (2) specifies the ratio of the focal length f4 of the fourth lens L4 to the focal length f5 of the fifth lens L5. Through the reasonable allocation of focal lengths, the system has better imaging quality and lower sensitivity.

[0053] Condition (3) specifies the ratio of the on-axis distance d10 from the image side of the fifth lens L5 to the object side of the sixth lens L6 to the on-axis distance d12 from the image side of the sixth lens L6 to the object side of the seventh lens L7. Within the range of the condition, it helps to compress the total optical length and achieve the effect of ultra-thinning.

[0054] The central radius of curvature of the object side of the eighth lens L8 is defined as R15, and the central radius of curvature of the image side of the eighth lens L8 is defined as R16, satisfying the following relationship: 1.70≤(R15+R16) / (R15-R16)≤7.60. This defines the shape of the eighth lens L8. Within the range specified by the condition, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0055] In this embodiment, the first lens L1 has negative refractive power, and both the object-side and image-side surfaces of the first lens L1 are concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the first lens L1 can also be configured with other concave and convex distributions.

[0056] The focal length of the camera optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship: -6.37 ≤ f1 / f ≤ -0.72. This specifies the ratio of the focal length f1 of the first lens L1 to the focal length f of the camera optical lens 10. When within the specified range, the first lens L1 has appropriate negative refractive power, which is beneficial for reducing system aberrations and also for the development of camera optical lenses towards ultra-thinness and wide-angle capabilities. Preferably, -3.98 ≤ f1 / f ≤ -0.91 is satisfied.

[0057] The center radius of curvature of the object-side surface of the first lens L1 is R1, and the center radius of curvature of the image-side surface of the first lens L1 is R2, satisfying the following relationship: 0.21≤(R1+R2) / (R1-R2)≤1.40. By reasonably controlling the shape of the first lens L1, it can effectively correct system spherical aberration. Preferably, it satisfies 0.34≤(R1+R2) / (R1-R2)≤1.12.

[0058] The on-axis thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.03≤d1 / TTL≤0.10. Within the range of this condition, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.04≤d1 / TTL≤0.08.

[0059] In this embodiment, the second lens L2 has positive refractive power, and the object-side surface of the second lens L2 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions, and the second lens L2 can also have negative refractive power.

[0060] The focal length of the second lens L2 is defined as f2, and the focal length of the imaging optical lens 10 is f, satisfying the following relationship: 0.90≤f2 / f≤6.47. By controlling the positive optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system. Preferably, it satisfies 1.44≤f2 / f≤5.18.

[0061] The central radius of curvature of the object-side surface of the second lens L2 is R3, and the central radius of curvature of the image-side surface of the second lens L2 is R4, satisfying the following relationship: -8.63≤(R3+R4) / (R3-R4)≤-1.58, which defines the shape of the second lens L2. Within this range, as lenses develop towards ultra-thin and wide-angle designs, it is beneficial for correcting on-axis chromatic aberration. Preferably, it satisfies -5.39≤(R3+R4) / (R3-R4)≤-1.97.

[0062] The axial thickness of the second lens L2 is defined as d3, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d3 / TTL≤0.17. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.04≤d3 / TTL≤0.13.

[0063] In this embodiment, the third lens L3 has positive refractive power, and the object-side surface of the third lens L3 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions, and the third lens L3 can also have negative refractive power.

[0064] The focal length of the third lens L3 is defined as f3, and the focal length of the imaging optical lens 10 is f, satisfying the following relationship: 0.72 ≤ f3 / f ≤ 15.92. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies 1.15 ≤ f3 / f ≤ 12.74.

[0065] The central radius of curvature of the object-side surface of the third lens L3 is R5, and the central radius of curvature of the image-side surface of the third lens L3 is R6, satisfying the following relationship: -16.10≤(R5+R6) / (R5-R6)≤-0.41. This defines the shape of the third lens L3. Within the range specified by the condition, it can mitigate the degree of light refraction after passing through the lens and effectively reduce aberrations. Preferably, it satisfies -10.06≤(R5+R6) / (R5-R6)≤-0.51.

[0066] The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d5 / TTL≤0.11. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.04≤d5 / TTL≤0.09.

[0067] In this embodiment, the fourth lens L4 has positive refractive power, and the object-side surface of the fourth lens L4 is concave near the axis, while the image-side surface is convex near the axis. In other optional embodiments, the object-side and image-side surfaces of the fourth lens L4 can also be configured with other concave and convex distributions, and the fourth lens L4 can also have negative refractive power.

[0068] The focal length of the fourth lens L4 is defined as f4, and the focal length of the imaging optical lens 10 is f, satisfying the following relationship: 0.57 ≤ f4 / f ≤ 5.27. This specifies the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the imaging optical lens 10, which helps improve the performance of the optical system within the range of the condition. Preferably, it satisfies 0.91 ≤ f4 / f ≤ 4.22.

[0069] The central radius of curvature of the object-side surface of the fourth lens L4 is R7, and the central radius of curvature of the image-side surface of the fourth lens L4 is R8, satisfying the following relationship: 0.09≤(R7+R8) / (R7-R8)≤4.11. This defines the shape of the fourth lens L4. Within this range, with the development of ultra-thin wide-angle lenses, it is beneficial for correcting aberrations in off-axis drawing angles. Preferably, it satisfies 0.14≤(R7+R8) / (R7-R8)≤3.29.

[0070] The fourth lens L4 has an on-axis thickness of d7, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d7 / TTL≤0.15. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.04≤d7 / TTL≤0.12.

[0071] In this embodiment, the fifth lens L5 has negative refractive power, and both the object-side and image-side surfaces of the fifth lens L5 are concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the fifth lens L5 can be configured with other concave and convex distributions, and the fifth lens L5 can also have positive refractive power.

[0072] The focal length of the fifth lens L5 is defined as f5, and the focal length of the imaging optical lens 10 is f, satisfying the following relationship: -252.10 ≤ f5 / f ≤ -1.29. This limitation on the fifth lens L5 effectively makes the light angle of the imaging optical lens 10 smoother, reducing tolerance sensitivity. Preferably, it satisfies -157.56 ≤ f5 / f ≤ -1.61.

[0073] The central radius of curvature of the object-side surface of the fifth lens L5 is R9, and the central radius of curvature of the image-side surface of the fifth lens L5 is R10, satisfying the following relationship: -52.75≤(R9+R10) / (R9-R10)≤3.34. This defines the shape of the fifth lens L5, and when within this range, it is beneficial for correcting aberrations and other problems related to off-axis drawing angles. Preferably, it satisfies -32.97≤(R9+R10) / (R9-R10)≤2.67.

[0074] The fifth lens L5 has an on-axis thickness of d9, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d9 / TTL≤0.07. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.03≤d9 / TTL≤0.06.

[0075] In this embodiment, the sixth lens L6 has negative refractive power, and the object-side surface of the sixth lens L6 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the sixth lens L6 can also be configured with other concave and convex distributions, and the sixth lens L6 can also have positive refractive power.

[0076] The focal length of the camera optical lens 10 is defined as f, and the focal length of the sixth lens L6 is defined as f6, satisfying the following relationship: -11.31 ≤ f6 / f ≤ -1.13. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, -7.07 ≤ f6 / f ≤ -1.41 is satisfied.

[0077] The central radius of curvature of the object-side surface of the sixth lens L6 is R11, and the central radius of curvature of the image-side surface of the sixth lens L6 is R12, satisfying the following relationship: -5.32≤(R11+R12) / (R11-R12)≤1.62. This defines the shape of the sixth lens L6. Within this conditional range, with the development of ultra-thin wide-angle lenses, it is beneficial for correcting aberrations in off-axis drawing angles. Preferably, it satisfies -3.33≤(R11+R12) / (R11-R12)≤1.29.

[0078] The axial thickness of the sixth lens L6 is d11, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d11 / TTL≤0.06. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.03≤d11 / TTL≤0.05.

[0079] In this embodiment, the seventh lens L7 has positive refractive power, and both the object-side and image-side surfaces of the seventh lens L7 are convex near the axis. In other optional embodiments, the object-side and image-side surfaces of the seventh lens L7 can also be configured with other concave and convex distributions, and the seventh lens L7 can also have negative refractive power.

[0080] The focal length of the camera optical lens 10 is defined as f, and the focal length of the seventh lens L7 is defined as f7, satisfying the following relationship: 0.27≤f7 / f≤2.73. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies 0.42≤f7 / f≤2.19.

[0081] The central radius of curvature of the object-side surface of the seventh lens L7 is R13, and the central radius of curvature of the image-side surface of the seventh lens L7 is R14, satisfying the following relationship: -0.38≤(R13+R14) / (R13-R14)≤1.75. This specifies the shape of the seventh lens L7. Within this range, with the development of ultra-thin wide-angle lenses, it is beneficial for correcting aberrations in off-axis drawing angles. Preferably, it satisfies -0.24≤(R13+R14) / (R13-R14)≤1.40.

[0082] The axial thickness of the seventh lens L7 is d13, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.07≤d13 / TTL≤0.31. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.12≤d13 / TTL≤0.24.

[0083] In this embodiment, the eighth lens L8 has negative refractive power, and the object-side surface of the eighth lens L8 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the eighth lens L8 can also be configured with other concave and convex distributions, and the eighth lens L8 can also have positive refractive power.

[0084] The focal length of the camera optical lens 10 is defined as f, and the focal length of the eighth lens L8 is defined as f8, satisfying the following relationship: -25.88 ≤ f8 / f ≤ -0.49. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, -16.17 ≤ f8 / f ≤ -0.61 is satisfied.

[0085] The axial thickness of the eighth lens L8 is d15, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.04≤d15 / TTL≤0.14. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.07≤d15 / TTL≤0.11.

[0086] In this embodiment, the total optical length of the camera optical lens 10 is TTL, and the image height of the camera optical lens 10 is IH, satisfying TTL / IH≤2.10, thereby achieving ultra-thinness.

[0087] When the focal length, focal length of each lens, and central radius of curvature of the camera optical lens 10 of the present invention satisfy the above-mentioned relationship, the camera optical lens 10 can have good optical performance and at the same time meet the design requirements of wide-angle and ultra-thin design. According to the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0088] The camera optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, on-axis thickness, inversion point position, and stagnation point position are mm.

[0089] TTL: Total optical length (the axial distance from the object surface of the first lens L1 to the image plane Si), in mm.

[0090] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0091] In addition, at least one of the object-side and / or image-side surfaces of each lens may be provided with a recurve point and / or a stagnation point to meet the requirements of high-quality imaging. Specific implementation schemes are described below.

[0092] The following shows Figure 1 The design data for the camera optical lens 10 shown is as follows.

[0093] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0094] Table 1

[0095]

[0096]

[0097] The meanings of the symbols in the table above are as follows.

[0098] S1: Aperture;

[0099] R: Radius of curvature at the center of the optical surface;

[0100] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0101] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0102] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0103] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0104] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0105] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0106] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0107] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0108] R9: The central radius of curvature of the object-side surface of the fifth lens L5;

[0109] R10: The central radius of curvature of the image-side surface of the fifth lens L5;

[0110] R11: The central radius of curvature of the object-side surface of the sixth lens L6;

[0111] R12: The central radius of curvature of the image-side surface of the sixth lens L6;

[0112] R13: The central radius of curvature of the object-side surface of the seventh lens L7;

[0113] R14: The central radius of curvature of the image-side surface of the seventh lens L7;

[0114] R15: The central radius of curvature of the image-side surface of the eighth lens L8;

[0115] R16: The central radius of curvature of the image-side surface of the eighth lens L8;

[0116] R17: The center radius of curvature of the object side surface of the optical filter GF;

[0117] R18: Radius of curvature of the center of the image side of the optical filter GF;

[0118] d: Axial thickness of the lens, axial distance between lenses;

[0119] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0120] d1: On-axis thickness of the first lens L1;

[0121] 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;

[0122] d3: On-axis thickness of the second lens L2;

[0123] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0124] d5: On-axis thickness of the third lens L3;

[0125] 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;

[0126] d7: On-axis thickness of the fourth lens L4;

[0127] 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;

[0128] d9: On-axis thickness of the fifth lens L5;

[0129] d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

[0130] d11: On-axis thickness of the sixth lens L6;

[0131] d12: The axial distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

[0132] d13: On-axis thickness of the seventh lens L7;

[0133] d14: The axial distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

[0134] d15: On-axis thickness of the eighth lens L8;

[0135] d16: The axial distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

[0136] d17: On-axis thickness of the optical filter GF;

[0137] d18: The axial distance from the image-side surface of the optical filter GF to the image plane Si;

[0138] nd: Refractive index of the d-line;

[0139] nd1: The refractive index of the d-line of the first lens L1;

[0140] nd2: The refractive index of the d-line of the second lens L2;

[0141] nd3: The refractive index of the d-line of the third lens L3;

[0142] nd4: The refractive index of the d-line of the fourth lens L4;

[0143] nd5: The refractive index of the d-line of the fifth lens L5;

[0144] nd6: The refractive index of the d-line of the sixth lens L6;

[0145] nd7: The refractive index of the d-line of the seventh lens L7;

[0146] nd8: The refractive index of the d-line of the eighth lens L8;

[0147] ndg: The refractive index of the d-line of the optical filter GF;

[0148] vd: Abbe number;

[0149] v1: Abbe number of the first lens L1;

[0150] v2: Abbe number of the second lens L2;

[0151] v3: Abbe number of the third lens L3;

[0152] v4: Abbe number of the fourth lens L4;

[0153] v5: Abbe number of the fifth lens L5;

[0154] v6: Abbe number of the sixth lens L6;

[0155] v7: Abbe number of the seventh lens L7;

[0156] v8: Abbe number of the eighth lens L8;

[0157] vg: Abbe number of the optical filter GF.

[0158] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0159] Table 2

[0160]

[0161]

[0162] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (4). However, the present invention is not limited to the aspherical polynomial form represented by formula (4).

[0163] z=(cr 2 ) / {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 (4)

[0164] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane at the vertex of the aspheric optical axis).

[0165] Tables 3 and 4 show the inversion point and stagnation point design data of each lens in the camera optical lens 10 of this embodiment. Specifically, P1R1 and P1R2 represent the object-side and image-side surfaces of the first lens L1, respectively; P2R1 and P2R2 represent the object-side and image-side surfaces of the second lens L2, respectively; P3R1 and P3R2 represent the object-side and image-side surfaces of the third lens L3, respectively; P4R1 and P4R2 represent the object-side and image-side surfaces of the fourth lens L4, respectively; P5R1 and P5R2 represent the object-side and image-side surfaces of the fifth lens L5, respectively; P6R1 and P6R2 represent the object-side and image-side surfaces of the sixth lens L6, respectively; P7R1 and P7R2 represent the object-side and image-side surfaces of the seventh lens L7, respectively; and P8R1 and P8R2 represent the object-side and image-side surfaces of the eighth lens L8, respectively. The data in the "Inversion Point Position" column corresponds to the vertical distance from the inversion point set on the surface of each lens to the optical axis of the camera optical lens 10. The data in the "Station Point Position" field corresponds to the vertical distance from the station point set on each lens surface to the optical axis of the camera optical lens 10.

[0166] Table 3

[0167] Number of recurve points Recurve point location 1 Recurve point position 2 Recurve point position 3 P1R1 3 0.145 0.805 1.205 P1R2 2 0.795 0.925 / P2R1 0 / / / P2R2 0 / / / P3R1 0 / / / P3R2 2 0.325 0.545 / P4R1 0 / / / P4R2 2 0.305 0.485 / P5R1 0 / / / P5R2 2 0.135 0.825 / P6R1 2 0.035 0.775 / P6R2 2 0.215 0.895 / P7R1 1 0.435 / / P7R2 2 0.895 1.375 / P8R1 3 0.295 1.275 1.995 P8R2 1 0.495 / /

[0168] Table 4

[0169]

[0170]

[0171] In addition, Table 13 lists the values ​​of various parameters and the parameters specified in the conditional expressions in the first, second, and third embodiments.

[0172] As shown in Table 13, the first embodiment satisfies all the conditional expressions.

[0173] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passes through the camera optical lens 10 of the first embodiment. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0174] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 1.212 mm, the full field of view image height IH is 2.911 mm, and the field of view FOV in the diagonal direction is 100.40°. The camera optical lens 10 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0175] (Second Implementation)

[0176] 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. The meanings of the symbols in the following list are also the same as those in the first embodiment. Therefore, the same parts will not be repeated here. Only the differences are listed below.

[0177] In this embodiment, the camera optical lens 20 includes a total of eight lenses, which are, from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the aperture S1, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8.

[0178] In this embodiment, the image-side surface of the third lens L3 is convex at the paraxial position; the object-side surface of the fifth lens L5 is convex at the paraxial position; the object-side surface of the sixth lens L6 is concave at the paraxial position, and the image-side surface is convex at the paraxial position; the object-side surface of the seventh lens L7 is concave at the paraxial position.

[0179] Tables 5 and 6 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0180] Table 5

[0181]

[0182] Table 6 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0183] Table 6

[0184]

[0185]

[0186] Tables 7 and 8 show the design data for the inflection point and stagnation point of each lens in the camera optical lens 20.

[0187] Table 7

[0188] Number of recurve points Recurve point location 1 Recurve point position 2 P1R1 2 0.315 1.255 P1R2 1 1.025 / P2R1 1 0.945 / P2R2 0 / / P3R1 0 / / P3R2 1 0.375 / P4R1 0 / / P4R2 0 / / P5R1 1 0.315 / P5R2 1 0.655 / P6R1 1 0.785 / P6R2 1 1.025 / P7R1 2 0.865 1.295 P7R2 2 0.915 1.445 P8R1 2 0.375 1.505 P8R2 2 0.505 2.325

[0189] Table 8

[0190]

[0191]

[0192] Figure 6 , Figure 7 The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm after passing through the camera optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0193] As shown in Table 13 below, the camera optical lens 20 of this embodiment satisfies each conditional expression.

[0194] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 0.979 mm, the full field of view image height IH is 2.911 mm, and the field of view FOV in the diagonal direction is 116.40°. The camera optical lens 20 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0195] (Third Implementation)

[0196] 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. The meanings of the symbols in the following list are also the same as those in the first embodiment. Therefore, the same parts will not be repeated here. Only the differences are listed below.

[0197] In this embodiment, the camera optical lens 20 includes a total of eight lenses, which are, from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the aperture S1, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8.

[0198] In this embodiment, the object-side surface of the fourth lens L4 is convex at the paraxial position; the image-side surface of the fifth lens L5 is convex at the paraxial position; and the object-side surface of the sixth lens L6 is concave at the paraxial position, while the image-side surface is convex at the paraxial position.

[0199] Tables 9 and 10 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0200] Table 9

[0201]

[0202] Table 10 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0203] Table 10

[0204]

[0205]

[0206] Tables 11 and 12 show the design data for the inflection point and stagnation point of each lens in the camera optical lens 30.

[0207] Table 11

[0208] Number of recurve points Recurve point location 1 Recurve point position 2 Recurve point position 3 P1R1 1 0.495 / / P1R2 0 / / / P2R1 1 0.955 / / P2R2 0 / / / P3R1 0 / / / P3R2 0 / / / P4R1 0 / / / P4R2 0 / / / P5R1 0 / / / P5R2 0 / / / P6R1 0 / / / P6R2 1 0.775 / / P7R1 1 0.485 / / P7R2 2 0.355 0.925 / P8R1 3 0.555 1.655 2.065 P8R2 3 0.595 2.215 2.345

[0209] Table 12

[0210]

[0211]

[0212] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 30 of the third embodiment. Figure 12 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 30 of the third embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0213] As shown in Table 13 below, the camera optical lens 30 of this embodiment satisfies each conditional expression.

[0214] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 0.636 mm, the full field of view image height IH is 2.911 mm, and the field of view FOV in the diagonal direction is 135.00°. The camera optical lens 30 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0215] Table 13

[0216]

[0217]

[0218] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A camera optical lens, characterized in that, The camera optical lens comprises eight lenses, which, from the object side to the image side, are: 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; the first lens has negative refractive power. The object-side surface of the first lens is concave at the paraxial position, and the image-side surface of the first lens is concave at the paraxial position. The second lens has positive refractive power, the object side of the second lens is convex at the paraxial position, and the image side of the second lens is concave at the paraxial position; The third lens has positive refractive power, and the object side of the third lens is convex near the axis; The fourth lens has positive refractive power, and the image-side surface of the fourth lens is convex at the paraxial position. The fifth lens has negative refractive power; The sixth lens has negative refractive power; The seventh lens has positive refractive power, and the image-side surface of the seventh lens is convex at the paraxial position; The eighth lens has negative refractive power, the object side of the eighth lens is convex at the paraxial position, and the image side of the eighth lens is concave at the paraxial position. The field of view of the camera optical lens is FOV, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the axial distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is d10, the axial distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, the focal length of the camera optical lens is f, 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, the axial thickness of the first lens is d1, and the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 100.00°≤FOV≤135.00°; -1.50≤f4 / f5<0; 1.30≤d10 / d12≤7.80; -6.37≤f1 / f≤-0.72; 0.21≤(R1+R2) / (R1-R2)≤1.40; 0.03≤d1 / TTL≤0.

10.

2. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object-side surface of the eighth lens is R15, and the central radius of curvature of the image-side surface of the eighth lens is R16, and they satisfy the following relationship: 1.70≤(R15+R16) / (R15-R16)≤7.

60.

3. The camera optical lens according to claim 1, characterized in that, The camera optical lens satisfies the following relationship: -3.98≤f1 / f≤-0.91; 0.34≤(R1+R2) / (R1-R2)≤1.12; 0.04≤d1 / TTL≤0.

08.

4. The camera optical lens according to claim 1, characterized in that, 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: 0.90≤f² / f≤6.47; -8.63≤(R3+R4) / (R3-R4)≤-1.58; 0.02≤d3 / TTL≤0.

17.

5. The camera optical lens according to claim 4, characterized in that, The camera optical lens satisfies the following relationship: 1.44≤f² / f≤5.18; -5.39≤(R3+R4) / (R3-R4)≤-1.97; 0.04≤d3 / TTL≤0.

13.

6. 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: 0.72≤f3 / f≤15.92; -16.10≤(R5+R6) / (R5-R6)≤-0.41; 0.02≤d5 / TTL≤0.

11.

7. The camera optical lens according to claim 6, characterized in that, The camera optical lens satisfies the following relationship: 1.15≤f³ / f≤12.74; -10.06≤(R5+R6) / (R5-R6)≤-0.51; 0.04≤d5 / TTL≤0.

09.

8. The camera optical lens according to claim 1, characterized in that, The object-side radius of curvature of the fourth lens is R7, the image-side radius of curvature of the fourth lens is R8, and the axial thickness of the fourth lens is d7, satisfying the following relationship: 0.57≤f4 / f≤5.27; 0.09≤(R7+R8) / (R7-R8)≤4.11; 0.02≤d7 / TTL≤0.

15.

9. The camera optical lens according to claim 8, characterized in that, The camera optical lens satisfies the following relationship: 0.91≤f4 / f≤4.22; 0.14≤(R7+R8) / (R7-R8)≤3.29; 0.04≤d7 / TTL≤0.

12.

10. The camera optical lens according to claim 1, characterized in that, 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: -252.10≤f5 / f≤-1.29; -52.75≤(R9+R10) / (R9-R10)≤3.34; 0.02≤d9 / TTL≤0.

07.

11. The camera optical lens according to claim 10, characterized in that, The camera optical lens satisfies the following relationship: -157.56≤f5 / f≤-1.61; -32.97≤(R9+R10) / (R9-R10)≤2.67; 0.03≤d9 / TTL≤0.

06.

12. The camera optical lens according to claim 1, characterized in that, The sixth lens has a focal length of f6, a central radius of curvature of the object-side surface of the sixth lens of R11, a central radius of curvature of the image-side surface of the sixth lens of R12, and an axial thickness of d11, and satisfies the following relationship: -11.31≤f6 / f≤-1.13; -5.32≤(R11+R12) / (R11-R12)≤1.62; 0.02≤d11 / TTL≤0.

06.

13. The camera optical lens according to claim 12, characterized in that, The camera optical lens satisfies the following relationship: -7.07≤f6 / f≤-1.41; -3.33≤(R11+R12) / (R11-R12)≤1.29; 0.03≤d11 / TTL≤0.

05.

14. The camera optical lens according to claim 1, characterized in that, The seventh lens has a focal length of f7, a central radius of curvature of the object-side surface of the seventh lens of R13, a central radius of curvature of the image-side surface of the seventh lens of R14, and an axial thickness of d13, and satisfies the following relationship: 0.27≤f7 / f≤2.73; -0.38≤(R13+R14) / (R13-R14)≤1.75; 0.07≤d13 / TTL≤0.

31.

15. The camera optical lens according to claim 14, characterized in that, The camera optical lens satisfies the following relationship: 0.42≤f7 / f≤2.19; -0.24≤(R13+R14) / (R13-R14)≤1.40; 0.12≤d13 / TTL≤0.

24.

16. The camera optical lens according to claim 1, characterized in that, The eighth lens has a focal length of f8 and an on-axis thickness of d15, and satisfies the following relationship: -25.88≤f8 / f≤-0.49; 0.04≤d15 / TTL≤0.

14.

17. The camera optical lens according to claim 16, characterized in that, The camera optical lens satisfies the following relationship: -16.17≤f8 / f≤-0.61; 0.07≤d15 / TTL≤0.

11.

18. The camera optical lens according to claim 1, characterized in that, The image height of the camera optical lens is IH, which satisfies the following relationship: TTL / IH≤2.10.

Images