Imaging optical lens

Abstract

The present disclosure relates to an imaging optical lens, comprising a total of eight lenses. The eight lenses are arranged in sequence from an object side to an image side as follows: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens, a seventh lens having a positive refractive power, and an eighth lens having a negative refractive power, wherein the focal length of the imaging optical lens is defined as f, the focal length of the first lens is defined as f1, the focal length of the second lens is defined as f2, the central radius of curvature of the object-side surface of the second lens is defined as R3, the central radius of curvature of the image-side surface of the second lens is defined as R4, the central radius of curvature of the object-side surface of the fourth lens is defined as R7, and the central radius of curvature of the image-side surface of the fourth lens is defined as R8, satisfying the following relational expressions: -7.10≤f2 / (R3-R4)≤-1.50; 1.49≤R7 / R8≤3.01; and 0.95≤f1 / f≤1.16.

Description

Camera optical lens Technical Field

[0001] This disclosure 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 various smart devices, the demand for miniaturized camera lenses has been increasing. Due to the shrinking pixel size of image sensors and the current trend in electronic products towards high functionality and lightweight portability, miniaturized camera lenses with good image quality have become mainstream in the market. To achieve better image quality, multi-element lens structures are often used. Furthermore, with technological advancements and increasingly diverse user needs, as the pixel area of ​​image sensors continues to shrink and system requirements for image quality continue to rise, eight-element lens structures are gradually appearing in lens designs. There is an urgent need for wide-angle camera lenses with excellent optical characteristics, small size, and adequate aberration correction. Summary of the Invention

[0003] To address the aforementioned issues, the main objective of this disclosure is to provide a camera optical lens that possesses excellent optical performance while meeting the design requirements of being ultra-thin and having a wide angle of view.

[0004] To achieve the above objectives, the present disclosure provides a camera optical lens comprising eight lenses, which are arranged in the following order from the object side to the image side: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens, a seventh lens with positive refractive power, and an eighth lens with negative refractive power.

[0005] Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, 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 central radius of curvature of the object-side surface of the fourth lens is R7, and the central radius of curvature of the image-side surface of the fourth lens is R8, and the following relationship is satisfied:

[0006] -7.10≤f2 / (R3-R4)≤-1.50;

[0007] 1.49≤R7 / R8≤3.01;

[0008] 0.95≤f1 / f≤1.16.

[0009] Preferably, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, and they satisfy the following relationship:

[0010] -1.61≤f7 / f8≤-0.89.

[0011] Preferably, the central radius of curvature of the object side of the seventh lens is R13, and the central radius of curvature of the image side of the seventh lens is R14, and the following relationship is satisfied:

[0012] 0.19≤R13 / R14≤0.46.

[0013] Preferably, the object-side surface of the first lens is convex at the paraxial position, and the image-side surface of the first lens is concave at the paraxial position.

[0014] The center radius of curvature of the object-side surface of the first lens is R1, the center 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 relationship:

[0015] -1.65≤(R1+R2) / (R1-R2)≤-1.35;

[0016] 0.110≤d1 / TTL≤0.158.

[0017] Preferably, 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.

[0018] The second lens has an on-axis thickness of d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship:

[0019] -4.60≤f² / f≤-2.48;

[0020] 2.24≤(R3+R4) / (R3-R4)≤4.43;

[0021] 0.024≤d3 / TTL≤0.034.

[0022] Preferably, the object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is concave at the paraxial position.

[0023] The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the camera lens is TTL, and the following relationship is satisfied:

[0024] 6.29≤f3 / f≤18.27;

[0025] -15.70≤(R5+R6) / (R5-R6)≤-5.68;

[0026] 0.025≤d5 / TTL≤0.033.

[0027] Preferably, the object-side surface of the fourth lens is concave near the axis, and the image-side surface of the fourth lens is convex near the axis.

[0028] The fourth lens has a focal length of f4, an on-axis thickness of d7, and a total optical length of TTL, satisfying the following relationship:

[0029] 4.01≤f4 / f≤7.91;

[0030] 1.99≤(R7+R8) / (R7-R8)≤5.01;

[0031] 0.064≤d7 / TTL≤0.076.

[0032] Preferably, the object-side surface of the fifth lens is concave near the axis;

[0033] The fifth lens has a focal length of f5, a central radius of curvature of the object-side surface of the fifth lens of R9, a central radius of curvature of the image-side surface of the fifth lens of R10, an axial thickness of d9, and a total optical length of TTL, satisfying the following relationship:

[0034] -6.98≤f5 / f≤-3.61;

[0035] -1.02≤(R9+R10) / (R9-R10)≤-0.82;

[0036] 0.030≤d9 / TTL≤0.041.

[0037] Preferably, the object-side surface of the sixth lens is convex at the paraxial position, and the image-side surface of the sixth lens is concave at the paraxial position.

[0038] The sixth lens has a focal length of f6, a central radius of curvature of R11 on the object side, a central radius of curvature of R12 on the image side, an axial thickness of d11, and a total optical length of TTL, satisfying the following relationship:

[0039] -7.60≤f6 / f≤18.17;

[0040] -7.51≤(R11+R12) / (R11-R12)≤4.45;

[0041] 0.051≤d11 / TTL≤0.068.

[0042] Preferably, the object-side surface of the seventh lens is convex at the paraxial position, and the image-side surface of the seventh lens is concave at the paraxial position.

[0043] The seventh lens has a focal length of f7, a central radius of curvature of the object side of the seventh lens of R13, a central radius of curvature of the image side of the seventh lens of R14, an axial thickness of d13, and a total optical length of TTL, satisfying the following relationship:

[0044] 0.81≤f7 / f≤1.36;

[0045] -2.64≤(R13+R14) / (R13-R14)≤-1.49;

[0046] 0.078≤d13 / TTL≤0.102.

[0047] Preferably, the object-side surface of the eighth lens is concave at the paraxial position, and the image-side surface of the eighth lens is concave at the paraxial position.

[0048] The eighth lens has a focal length of f8, a central radius of curvature of R15 on the object side, a central radius of curvature of R16 on the image side, an axial thickness of d15, and a total optical length of TTL, satisfying the following relationship:

[0049] -0.91≤f8 / f≤-0.72;

[0050] -0.38≤(R15+R16) / (R15-R16)≤-0.31;

[0051] 0.060≤d15 / TTL≤0.088.

[0052] Preferably, the first lens is made of glass.

[0053] The beneficial effects of this disclosure are as follows: the camera optical lens according to this disclosure has excellent optical characteristics, and has the characteristics of wide-angle and ultra-thin design, and is especially suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0055] Figure 1 is a schematic diagram of the structure of the camera optical lens according to the first embodiment of this disclosure;

[0056] Figure 2 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 1;

[0057] Figure 3 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 1;

[0058] Figure 4 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 1;

[0059] Figure 5 is a schematic diagram of the structure of the camera optical lens according to the second embodiment of this disclosure;

[0060] Figure 6 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 5;

[0061] Figure 7 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 5;

[0062] Figure 8 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 5;

[0063] Figure 9 is a schematic diagram of the structure of the camera optical lens according to the third embodiment of this disclosure;

[0064] Figure 10 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 9;

[0065] Figure 11 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 9;

[0066] Figure 12 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 9;

[0067] Figure 13 is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of this disclosure;

[0068] Figure 14 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 13;

[0069] Figure 15 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 13;

[0070] Figure 16 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 13;

[0071] Figure 17 is a schematic diagram of the structure of the camera optical lens according to the fifth embodiment of this disclosure;

[0072] Figure 18 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 17;

[0073] Figure 19 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 17;

[0074] Figure 20 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 17; Detailed Implementation

[0075] To make the objectives, technical solutions, and advantages of this disclosure clearer, the various embodiments of this disclosure 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 disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0076] Referring to the accompanying drawings, the present disclosure provides a camera optical lens 10, 20, 30, 40, and 50. Figures 1, 5, 9, 13, and 17 show the camera optical lenses 10, 20, 30, 40, and 50 of the present disclosure, which together comprise eight lenses. Specifically, the camera optical lens, from the object side to the image side, is arranged as follows: aperture S1, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. An optical filter GF or other optical element may be disposed between the eighth lens L8 and the image plane S1. The aperture S1 may also be disposed between the first lens L1 and the second lens L2.

[0077] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, the seventh lens L7 is made of plastic, and the eighth lens L8 is made of plastic. Other materials may also be used for the lenses.

[0078] 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, and the central radius of curvature of the image-side surface of the second lens L2 is R4. These conditions satisfy the following relationship: -7.10 ≤ f2 / (R3-R4) ≤ -1.50. Within this range, it helps to reasonably control the surface shape of the second lens L2 and reduces the sensitivity of the system. Furthermore, by reducing the molding difficulty, the manufacturing yield is improved, and stray light generated by the lens can also be reduced, thus improving the lens's image quality.

[0079] The central radius of curvature of the side surface of the fourth lens L4 is defined as R7, and the central radius of curvature of the side surface of the fourth lens L4 is defined as R8, satisfying the following relationship: 1.49≤R7 / R8≤3.01. This defines the shape of the fourth lens L4. Within the range of the condition, it is beneficial to mitigate the degree of light deflection after passing through the lens and can effectively reduce aberrations.

[0080] The focal length of the camera optical lens is defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship 0.95≤f1 / f≤1.16, which specifies the ratio of the first lens L1 to the total focal length of the system. By reasonably allocating the optical focal length of the system, the system achieves better imaging quality and lower sensitivity.

[0081] Under the above conditions, the camera optical lenses 10, 20, 30, 40, and 50 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, 40, and 50, they are particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other camera elements.

[0082] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0083] The focal length of the seventh lens L7 is defined as f7, and the focal length of the eighth lens L8 is defined as f8, satisfying the following relationship: -1.61≤f7 / f8≤-0.89. This specifies the ratio of the focal lengths of the seventh lens L7 and the eighth lens L8. Within the range of the condition, by reasonably allocating the optical focal lengths of the image-side lenses, the field curvature of the system can be effectively balanced, making the field curvature shift of the central field of view less than 0.02mm.

[0084] The central radius of curvature of the object side of the seventh lens L7 is defined as R13, and the central radius of curvature of the image side of the seventh lens L7 is defined as R14, satisfying the following relationship: 0.19≤R13 / R14≤0.46. This defines the shape of the seventh lens L7, which can mitigate the degree of light deflection through the lens within the conditional range, effectively correct chromatic aberration, and make the chromatic aberration |LC|<4.0μm.

[0085] The object side of the first lens L1 is convex near the axis, and the image side is concave near the axis. The first lens L1 has positive refractive power.

[0086] The center radius of curvature of the object side of the first lens L1 is R1, and the center radius of curvature of the image side of the first lens L1 is R2, satisfying the following relationship: -1.65≤(R1+R2) / (R1-R2)≤-1.35, which defines the shape of the first lens L1, which is beneficial to the shaping of the first lens L1. Within the range specified by the condition, it can mitigate the degree of refraction of light passing through the lens and effectively reduce aberrations.

[0087] The on-axis thickness of the first lens L1 is d1, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.110≤d1 / TTL≤0.158. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0088] The object side of the second lens L2 is convex near the axis, and the image side is concave near the axis. The second lens L2 has negative refractive power.

[0089] The focal length of the camera optical lens 10 is defined as f, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: -4.60≤f2 / f≤-2.48. By controlling the negative optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system.

[0090] The center radius of curvature of the object side of the second lens L2 is R3, and the center radius of curvature of the image side of the second lens L2 is R4, satisfying the following relationship: 2.24≤(R3+R4) / (R3-R4)≤4.43, which defines the shape of the second lens L2. When within this range, as lenses develop towards ultra-thin and wide-angle lenses, it is beneficial to correct on-axis chromatic aberration problems.

[0091] The on-axis thickness of the second lens L2 is d3, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.024≤d3 / TTL≤0.034. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0092] The object-side surface of the third lens L3 is convex near the axis, and the image-side surface is concave near the axis. The third lens L3 has positive refractive power. The object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions.

[0093] The focal length of the camera optical lens 10 is defined as f, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: 6.29≤f3 / f≤18.27. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0094] The central radius of curvature of the object side of the third lens L3 is R5, and the central radius of curvature of the image side of the third lens L3 is R6, satisfying the following relationship: -15.70≤(R5+R6) / (R5-R6)≤-5.68, which specifies the shape of the third lens L3, which is beneficial to the shaping of the third lens L3. Within the range specified by the condition formula, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0095] The on-axis thickness of the third lens L3 is d5, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.025≤d5 / TTL≤0.033. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0096] The object side of the fourth lens L4 is concave near the axis, and the image side is convex near the axis. The fourth lens L4 has positive refractive power.

[0097] The focal length of the camera optical lens 10 is defined as f, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 4.01≤f4 / f≤7.91. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0098] The center radius of curvature of the object side of the fourth lens L4 is R7, and the center radius of curvature of the image side of the fourth lens L4 is R8, and the following relationship is satisfied: 1.99≤(R7+R8) / (R7-R8)≤5.01, which defines the shape of the fourth lens L4. When within the range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0099] The on-axis thickness of the fourth lens L4 is d7, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.064≤d7 / TTL≤0.076. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0100] The object side of the fifth lens L5 is concave near the axis, and the image side is either concave or convex near the axis. The fifth lens L5 has negative refractive power.

[0101] The focal length of the camera optical lens 10 is defined as f, and the focal length of the fifth lens L5 is defined as f5, satisfying the following relationship: -6.98≤f5 / f≤-3.61. The limitation of the fifth lens L5 can effectively make the light angle of the camera optical lens 10 smooth and reduce tolerance sensitivity.

[0102] The central radius of curvature of the object side of the fifth lens L5 is R9, and the central radius of curvature of the image side of the fifth lens L5 is R10, and they satisfy the following relationship: -1.02≤(R9+R10) / (R9-R10)≤-0.82, which defines the shape of the fifth lens L5. When within this range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0103] The fifth lens L5 has an on-axis thickness of d9, and the total optical length of the camera lens 10 is TTL, satisfying the following relationship: 0.030≤d9 / TTL≤0.041. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0104] The object side of the sixth lens L6 is convex near the axis, and the image side is concave near the axis. The sixth lens L6 has negative or positive refractive power.

[0105] 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: -7.60≤f6 / f≤18.17. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0106] The center radius of curvature of the object side of the sixth lens L6 is R11, and the center radius of curvature of the image side of the sixth lens L6 is R12, and they satisfy the following relationship: -7.51≤(R11+R12) / (R11-R12)≤4.45, which defines the shape of the sixth lens L6. Within the specified range, with the development of ultra-thin wide-angle lenses, this is beneficial for correcting aberrations and other problems in off-axis drawing angles.

[0107] The axial thickness of the sixth lens L6 is d11, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.051≤d11 / TTL≤0.068. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0108] The object side of the seventh lens L7 is convex near the axis, and the image side is concave near the axis. The seventh lens L7 has positive refractive power.

[0109] 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: 0.81≤f7 / f≤1.36. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0110] The central radius of curvature of the object side of the seventh lens L7 is R13, and the central radius of curvature of the image side of the seventh lens L7 is R14, satisfying the following relationship: -2.64≤(R13+R14) / (R13-R14)≤-1.49, which defines the shape of the seventh lens L7. Within the specified range, with the development of ultra-thin wide-angle lenses, this is beneficial for correcting aberrations and other problems in off-axis drawing angles.

[0111] The axial thickness of the seventh lens L7 is d13, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.078≤d13 / TTL≤0.102. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0112] The object side of the eighth lens L8 is concave near the axis, and the image side is concave near the axis. The eighth lens L8 has negative refractive power.

[0113] 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: -0.91≤f8 / f≤-0.72. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0114] The central radius of curvature of the object side of the eighth lens L8 is R15, and the central radius of curvature of the image side of the eighth lens L8 is R16, satisfying the following relationship: -0.38≤(R15+R16) / (R15-R16)≤-0.31, which defines the shape of the eighth lens. Within the specified range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0115] The axial thickness of the eighth lens L8 is d15, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.060≤d15 / TTL≤0.088. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0116] The image height of the 1.0 field of view of the camera optical lens 10 is IH, and the total optical length of the camera optical lens 10 is TTL, and satisfies the following relationship: TTL / IH≤1.32, which is beneficial to achieving ultra-thinness.

[0117] The field of view (FOV) of the camera optical lens 10 is greater than or equal to 78.70°, thereby achieving wide-angle viewing.

[0118] The camera optical lens 10 has an aperture value FNO less than or equal to 1.73, thereby achieving a large aperture and good imaging performance.

[0119] The following examples will illustrate the camera optical lens disclosed herein. The symbols used in each example are shown below. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0120] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image surface Si), in mm;

[0121] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0122] 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);

[0123] 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor;

[0124] Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviation;

[0125] FOVm: The field of view angle corresponding to the image height of the MIC field of view.

[0126] Preferably, the object-side and / or image-side surfaces of the lens may also be provided with inflection points and / or stagnation points to meet the requirements of high-quality imaging.

[0127] The technical solution of this disclosure will now be described in detail with five implementation methods.

[0128] (First Implementation)

[0129] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of this disclosure.

[0130] Table 1

[0131] The meanings of each symbol are as follows.

[0132] S1: Aperture;

[0133] R: Radius of curvature at the center of the optical surface;

[0134] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0135] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0136] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0137] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0138] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0139] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0140] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0141] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0142] R9: The central radius of curvature of the object-side surface of the fifth lens L5;

[0143] R10: The central radius of curvature of the image-side surface of the fifth lens L5;

[0144] R11: The central radius of curvature of the object-side surface of the sixth lens L6;

[0145] R12: The central radius of curvature of the image-side surface of the sixth lens L6;

[0146] R13: The central radius of curvature of the object-side surface of the seventh lens L7;

[0147] R14: The central radius of curvature of the image-side surface of the seventh lens L7;

[0148] R15: The central radius of curvature of the object side surface of the eighth lens L8;

[0149] R16: The central radius of curvature of the image-side surface of the eighth lens L8;

[0150] R17: The center radius of curvature of the object side surface of the optical filter GF;

[0151] R18: Radius of curvature of the center of the image side of the optical filter GF;

[0152] d: Axial thickness of the lens, axial distance between lenses;

[0153] d0: The axial distance from aperture S1 to the object-side surface of the first lens L1;

[0154] d1: On-axis thickness of the first lens L1;

[0155] 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;

[0156] d3: On-axis thickness of the second lens L2;

[0157] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0158] d5: On-axis thickness of the third lens L3;

[0159] 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;

[0160] d7: On-axis thickness of the fourth lens L4;

[0161] 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;

[0162] d9: On-axis thickness of the fifth lens L5;

[0163] d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

[0164] d11: On-axis thickness of the sixth lens L6;

[0165] d12: The axial distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

[0166] d13: On-axis thickness of the seventh lens L7;

[0167] d14: The axial distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

[0168] d15: On-axis thickness of the eighth lens L8;

[0169] d16: The axial distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

[0170] d17: On-axis thickness of the optical filter GF;

[0171] d18: The axial distance from the image-side surface of the optical filter GF to the image plane Si;

[0172] nd: Refractive index of the d-line (the d-line represents green light with a wavelength of 550 nm);

[0173] nd1: The refractive index of the d-line of the first lens L1;

[0174] nd2: The refractive index of the d-line of the second lens L2;

[0175] nd3: The refractive index of the d-line of the third lens L3;

[0176] nd4: The refractive index of the d-line of the fourth lens L4;

[0177] nd5: The refractive index of the d-line of the fifth lens L5;

[0178] nd6: The refractive index of the d-line of the sixth lens L6;

[0179] nd7: The refractive index of the d-line of the seventh lens L7;

[0180] nd8: The refractive index of the d-line of the eighth lens L8;

[0181] ndg: The refractive index of the d-line of the optical filter GF;

[0182] vd: Abbe number;

[0183] v1: Abbe number of the first lens L1;

[0184] v2: Abbe number of the second lens L2;

[0185] v3: Abbe number of the third lens L3;

[0186] v4: Abbe number of the fourth lens L4;

[0187] v5: Abbe number of the fifth lens L5;

[0188] v6: Abbe number of the sixth lens L6;

[0189] v7: Abbe number of the seventh lens L7;

[0190] v8: Abbe number of the eighth lens L8;

[0191] vg: Abbe number of the optical filter GF.

[0192] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of this disclosure.

[0193] Table 2

[0194] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, this disclosure is not limited to the aspherical polynomial form represented by formula (1).

[0195] 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 +A22r 22 +A24r 24 +A26r 26 +A28r28 +A30r 30 (1)

[0196] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 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).

[0197] Figures 2 and 3 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passes through the camera optical lens 10 of the first embodiment, respectively. Figure 4 shows schematic diagrams of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 10 of the first embodiment. In Figure 4, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0198] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 5.115mm, the image height IH of the 1.0 field of view is 8.165mm, the field of view FOV of the 1.0 field of view is 85.48°, the image height IHm of the MIC field of view is 8.415mm, and the field of view FOVm of the MIC field of view is 87.91°. The camera optical lens 10 meets the design requirements of large aperture, wide angle, and ultra-thin design. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0199] (Second Implementation)

[0200] The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0201] Figure 5 shows the camera optical lens 20 of the second embodiment of this disclosure.

[0202] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of this disclosure.

[0203] Table 3

[0204] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of this disclosure.

[0205] Table 4

[0206] Figures 6 and 7 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm passes through the camera optical lens 20 of the second embodiment, respectively. Figure 8 shows schematic diagrams of field curvature and distortion after light with a wavelength of 546 nm passes through the camera optical lens 20 of the second embodiment. In Figure 8, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0207] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 4.953mm, the image height IH of the 1.0 field of view is 8.165mm, the field of view FOV of the 1.0 field of view is 86.70°, the image height IHm of the MIC field of view is 8.415mm, and the field of view FOVm of the MIC field of view is 88.85°. The camera optical lens 20 meets the design requirements of large aperture, wide angle, and ultra-thin design. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0208] (Third Implementation)

[0209] The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0210] Unlike the first embodiment, the image-side surface of the fifth lens L5 is convex at the paraxial position.

[0211] Figure 9 shows the camera optical lens 30 of the third embodiment of this disclosure.

[0212] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of this disclosure.

[0213] Table 5

[0214] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of this disclosure.

[0215] Table 6

[0216] Figures 10 and 11 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm passes through the camera optical lens 30 of the third embodiment, respectively. Figure 12 shows schematic diagrams of field curvature and distortion after light with a wavelength of 546 nm passes through the camera optical lens 30 of the third embodiment. In Figure 12, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0217] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 5.299mm, the image height IH of the 1.0 field of view is 8.165mm, the field of view FOV of the 1.0 field of view is 78.70°, the image height IHm of the MIC field of view is 8.415mm, and the field of view FOVm of the MIC field of view is 81.11°. The camera optical lens 30 meets the design requirements of large aperture, wide angle, and ultra-thin design. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0218] (Fourth Implementation)

[0219] The symbols in the fourth embodiment have the same meanings as those in the first embodiment.

[0220] Unlike the first embodiment, the sixth lens L6 has positive refractive power.

[0221] Figure 13 shows the camera optical lens 40 of the fourth embodiment of this disclosure.

[0222] Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of this disclosure.

[0223] Table 7

[0224] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of this disclosure.

[0225] Table 8

[0226] Figures 14 and 15 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm passes through the camera optical lens 40 of the fourth embodiment, respectively. Figure 16 shows schematic diagrams of field curvature and distortion after light with a wavelength of 546 nm passes through the camera optical lens 40 of the fourth embodiment. In Figure 16, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0227] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 5.038mm, the image height IH of the 1.0 field of view is 8.165mm, the field of view FOV of the 1.0 field of view is 82.01°, the image height IHm of the MIC field of view is 8.415mm, and the field of view FOVm of the MIC field of view is 84.16°. The camera optical lens 40 meets the design requirements of large aperture, wide angle, and ultra-thin design. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0228] (Fifth Implementation)

[0229] The symbols in the fifth embodiment have the same meanings as those in the first embodiment.

[0230] Unlike the first embodiment, the image-side surface of the fifth lens L5 is convex at the paraxial position.

[0231] Figure 17 shows the camera optical lens 50 of the fourth embodiment of this disclosure.

[0232] Tables 9 and 10 show the design data of the camera optical lens 50 according to the fourth embodiment of this disclosure.

[0233] Table 9

[0234] Table 10 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of this disclosure.

[0235] Table 10

[0236] Figures 18 and 19 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm passes through the camera optical lens 50 of the fifth embodiment, respectively. Figure 20 shows schematic diagrams of field curvature and distortion after light with a wavelength of 546 nm passes through the camera optical lens 50 of the fifth embodiment. In Figure 20, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0237] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 5.023mm, the image height IH of the 1.0 field of view is 8.165mm, the field of view FOV of the 1.0 field of view is 81.98°, the image height IHm of the MIC field of view is 8.415mm, and the field of view FOVm of the MIC field of view is 84.28°. The camera optical lens 50 meets the design requirements of large aperture, wide angle, and ultra-thin design. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0238] Table 11, which appears later, shows the values ​​corresponding to the parameters specified in the conditional expressions for various numerical values ​​in each of the first, second, third, fourth, and fifth implementation methods.

[0239] Table 11

[0240] Those skilled in the art will understand that the above embodiments are specific implementations of this disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this disclosure.

Claims

1. A camera optical lens, characterized in that, The camera optical lens comprises eight lenses, which are arranged in the following order from the object side to the image side: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens, a seventh lens with positive refractive power, and an eighth lens with negative refractive power. Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, 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 central radius of curvature of the object-side surface of the fourth lens is R7, and the central radius of curvature of the image-side surface of the fourth lens is R8, and the following relationship is satisfied: -7.10≤f2 / (R3-R4)≤-1.50; 1.49≤R7 / R8≤3.01; 0.95≤f1 / f≤1.

16.

2. The camera optical lens according to claim 1, characterized in that, The focal length of the seventh lens is f7, and the focal length of the eighth lens is f8, and they satisfy the following relationship: -1.61≤f7 / f8≤-0.

89.

3. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object side of the seventh lens is R13, and the central radius of curvature of the image side of the seventh lens is R14, and they satisfy the following relationship: 0.19≤R13 / R14≤0.

46.

4. The camera optical lens according to claim 1, characterized in that, The object-side surface of the first lens is convex at the paraxial position, and the image-side surface of the first lens is concave at the paraxial position. The center radius of curvature of the object-side surface of the first lens is R1, the center 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 relationship: -1.65≤(R1+R2) / (R1-R2)≤-1.35; 0.110≤d1 / TTL≤0.

158.

5. The camera optical lens according to claim 1, characterized in that, 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 second lens has an on-axis thickness of d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: -4.60≤f² / f≤-2.48; 2.24≤(R3+R4) / (R3-R4)≤4.43; 0.024≤d3 / TTL≤0.

034.

6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is concave at the paraxial position. The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the camera lens is TTL, and the following relationship is satisfied: 6.29≤f3 / f≤18.27; -15.70≤(R5+R6) / (R5-R6)≤-5.68; 0.025≤d5 / TTL≤0.

033.

7. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fourth lens is concave near the axis, and the image-side surface of the fourth lens is convex near the axis. The fourth lens has a focal length of f4, an on-axis thickness of d7, and a total optical length of TTL, satisfying the following relationship: 4.01≤f4 / f≤7.91; 1.99≤(R7+R8) / (R7-R8)≤5.01; 0.064≤d7 / TTL≤0.

076.

8. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fifth lens is concave near the axis; The fifth lens has a focal length of f5, a central radius of curvature of the object-side surface of the fifth lens of R9, a central radius of curvature of the image-side surface of the fifth lens of R10, an axial thickness of d9, and a total optical length of TTL, satisfying the following relationship: -6.98≤f5 / f≤-3.61; -1.02≤(R9+R10) / (R9-R10)≤-0.82; 0.030≤d9 / TTL≤0.

041.

9. The camera optical lens according to claim 1, characterized in that, The object-side surface of the sixth lens is convex at the paraxial position, and the image-side surface of the sixth lens is concave at the paraxial position. The sixth lens has a focal length of f6, a central radius of curvature of R11 on the object side, a central radius of curvature of R12 on the image side, an axial thickness of d11, and a total optical length of TTL, satisfying the following relationship: -7.60≤f6 / f≤18.17; -7.51≤(R11+R12) / (R11-R12)≤4.45; 0.051≤d11 / TTL≤0.

068.

10. The camera optical lens according to claim 1, characterized in that, The object-side surface of the seventh lens is convex at the paraxial position, and the image-side surface of the seventh lens is concave at the paraxial position. The seventh lens has a focal length of f7, a central radius of curvature of the object side of the seventh lens of R13, a central radius of curvature of the image side of the seventh lens of R14, an axial thickness of d13, and a total optical length of TTL, satisfying the following relationship: 0.81≤f7 / f≤1.36; -2.64≤(R13+R14) / (R13-R14)≤-1.49; 0.078≤d13 / TTL≤0.

102.

11. The camera optical lens according to claim 1, characterized in that, The object-side surface of the eighth lens is concave at the paraxial level, and the image-side surface of the eighth lens is concave at the paraxial level. The eighth lens has a focal length of f8, a central radius of curvature of R15 on the object side, a central radius of curvature of R16 on the image side, an axial thickness of d15, and a total optical length of TTL, satisfying the following relationship: -0.91≤f8 / f≤-0.72; -0.38≤(R15+R16) / (R15-R16)≤-0.31; 0.060≤d15 / TTL≤0.

088.

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

Images