Camera lens

Abstract

This invention relates to the field of optical lenses and discloses a camera optical lens comprising six lenses, arranged sequentially from the object side to the image side as follows: a first lens with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with refractive power, and a sixth lens with positive refractive power; at least one of the first to sixth lenses contains a freeform surface; the effective radius of the object side of the first lens in the X direction is DTX1, the effective radius of the object side of the first lens in the Y direction is DTY1, the focal length of the first lens is f1, the focal length of the fourth lens is f4, the axial distance from the image side of the second lens to the object side of the third lens is d4, and the axial distance from the image side of the third lens to the object side of the fourth lens is d6, satisfying the following relationships: 1.40≤DTX1 / DTY1≤3.00; 4.00≤f1 / f4≤10.00; 0.50≤d4 / d6≤2.00.

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] With the development of imaging lenses, people have increasingly higher requirements for lens imaging. "Night scene photography" and "background blur" have become important indicators for evaluating lens imaging standards. Existing structured light focal length allocation, lens spacing, and lens shape settings are insufficient, resulting in inadequate aberration correction. Furthermore, rotationally symmetric aspherical surfaces cannot effectively correct aberrations. Freeform surfaces, a non-rotationally symmetric surface type, can better balance aberrations and improve image quality, and the processing of freeform surfaces is becoming increasingly sophisticated. With the increasing demands for lens imaging, incorporating freeform surfaces into lens design is crucial, especially in the design of periscope telephoto lenses. [Summary of the Invention]

[0003] To address the aforementioned problems, the present invention aims to provide a camera optical lens that possesses excellent optical performance while maintaining a large aperture, low aberrations, and periscope telephoto capability.

[0004] The technical solution of the present invention is as follows:

[0005] A camera optical lens comprises six lenses, which are arranged sequentially from the object side to the image side as follows: a first lens with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with refractive power, and a sixth lens with positive refractive power; at least one of the first lens to the sixth lens contains a freeform surface; the effective radius of the object side surface of the first lens in the X direction is DTX1, the effective radius of the object side surface of the first lens in the Y direction is DTY1, the focal length of the first lens is f1, the focal length of the fourth lens is f4, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the axial distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, satisfying the following relationships: 1.40≤DTX1 / DTY1≤3.00; 4.00≤f1 / f4≤10.00; 0.50≤d4 / d6≤2.00.

[0006] Preferably, the aperture value of the camera optical lens is FNO, and satisfies the following relationship: 2.40≤FNO≤3.50.

[0007] Preferably, the axial distance from the image side of the fourth lens to the object side of the fifth lens is d8, and the axial distance from the image side of the fifth lens to the object side of the sixth lens is d10, satisfying the following relationship: 0.50≤d10 / d8≤2.50.

[0008] Preferably, the central radius of curvature of the object side of the first lens is R1, and the central radius of curvature of the image side of the first lens is R2, and the following relationship is satisfied: 0.50≤R1 / R2≤2.00.

[0009] Preferably, the focal length of the camera optical lens is f, the on-axis thickness of the first lens is d1, and the total optical length of the camera optical lens is TTL, and satisfies the following relationships: -338.86≤f1 / f≤8.90; 0.03≤d1 / TTL≤0.28.

[0010] Preferably, the overall 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 of the second lens is R3, the central radius of curvature of the image side 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: 0.21≤f2 / f≤0.97; -2.89≤(R3+R4) / (R3-R4)≤-0.51; 0.03≤d3 / TTL≤0.13.

[0011] Preferably, the focal length of the camera optical lens as a whole is f, 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 optical lens is TTL, and satisfies the following relationships: -0.51≤f3 / f≤-0.15; 0.19≤(R5+R6) / (R5-R6)≤1.08; 0.01≤d5 / TTL≤0.08.

[0012] Preferably, the overall focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fourth lens is R7, the central radius of curvature of the image side 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: -84.72≤f4 / f≤0.89; -0.77≤(R7+R8) / (R7-R8)≤46.29; 0.02≤d7 / TTL≤0.11.

[0013] Preferably, the overall focal length of the camera optical lens is f, the focal length of the fifth lens is f5, 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 camera optical lens is TTL, and satisfies the following relationships: -39.64≤f5 / f≤2162.66; -2.44≤(R9+R10) / (R9-R10)≤185.41; 0.01≤d9 / TTL≤0.13.

[0014] Preferably, the overall 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: 0.45≤f6 / f≤1.68; -14.94≤(R11+R12) / (R11-R12)≤-2.39; 0.02≤d11 / TTL≤0.15.

[0015] The beneficial effects of this invention are as follows: the camera optical lens according to this invention possesses excellent optical performance while maintaining a large aperture, low aberration, and periscope-style long focal length. Furthermore, at least one lens from the first to the sixth lens contains a freeform surface, which can effectively correct aberrations and further improve the performance of the optical system. It is particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other imaging elements. [Attached Image Description]

[0016] 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:

[0017] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0018] Figure 2 for Figure 1 The RMS spot diameter of the camera optical lens shown is in the first quadrant.

[0019] Figure 3 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0020] Figure 4 for Figure 3The RMS spot diameter of the camera optical lens shown is in the first quadrant.

[0021] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0022] Figure 6 for Figure 5 The RMS spot diameter of the camera optical lens shown is in the first quadrant.

[0023] Figure 7 This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention;

[0024] Figure 8 for Figure 7 The RMS spot diameter of the camera optical lens shown is in the first quadrant.

[0025] Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the fifth embodiment of the present invention;

[0026] Figure 10 for Figure 9 The RMS spot diameter of the camera optical lens shown is in the first quadrant.

[0027] Figure 11 This is a schematic diagram of the structure of the camera optical lens according to the sixth embodiment of the present invention;

[0028] Figure 12 for Figure 11 The RMS spot diameter of the camera optical lens shown is in the first quadrant.

Detailed Implementation Methods

[0029] 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.

[0030] (First Implementation)

[0031] Referring to the accompanying drawings, the present invention provides a camera optical lens 10. Figure 1The image shown is a camera optical lens 10 according to a first embodiment of the present invention. The camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10, from the object side to the image side, includes: a first lens L1, a second lens L2, an aperture S1, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical filter GF or other optical element can be disposed between the sixth lens L6 and the image plane S1. A reflective element RF can also be disposed on the object side of the first lens L1 to deflect light and reflect it into the camera optical lens 10, forming a periscope lens structure. The reflective element RF can be a plane mirror or a prism.

[0032] In this embodiment, the first lens L1 is made of plastic, 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, and the sixth lens L6 is made of plastic; in other embodiments, each lens may be made of other materials.

[0033] In this embodiment, at least one of the first lens L1 to the sixth lens L6 is defined to contain a freeform surface, which helps to correct aberrations such as astigmatism, field curvature and distortion in the optical system.

[0034] The effective radius of the object-side surface of the first lens L1 in the X direction is defined as DTX1, and the effective radius of the object-side surface of the first lens L1 in the Y direction is defined as DTY1, satisfying the following relationship: 1.40≤DTX1 / DTY1≤3.00. This specifies the ratio of the effective radii of the object-side surface of the first lens L1 in the X and Y directions, which is the ratio of the entrance pupil size of the system in the X and Y directions. Within the range of the condition, this is beneficial to improving the light throughput of the camera optical lens, making Fno≤3.5.

[0035] The focal length of the first lens L1 is defined as f1, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 4.00≤f1 / f4≤10.00. This specifies the ratio of the focal length of the fourth lens L4 to the focal length of the first lens L1. Within this range, by reasonably allocating the optical focal length, the camera optical lens can achieve better imaging quality and lower sensitivity.

[0036] The axial distance from the image side of the second lens L2 to the object side of the third lens L3 is defined as d4, and the axial distance from the image side of the third lens L3 to the object side of the fourth lens L4 is defined as d6, satisfying the following relationship: 0.50≤d4 / d6≤2.00. This specifies the ratio of the air gap between the second and third lenses to the air gap between the third and fourth lenses, which, within the range of the condition, helps to compress the total optical length of the camera lens.

[0037] When the camera optical lens 10 of the present invention includes at least one freeform surface, and the focal length of the relevant lens and the central radius of curvature of the relevant lens satisfy the above-mentioned relationship, the camera optical lens 10 can have high performance and meet the requirements of large aperture, periscope telephoto and low aberration.

[0038] The aperture value of the camera optical lens 10 is defined as FNO, and satisfies the following relationship: 2.40≤FNO≤3.50. Within this range, the camera optical lens 10 has a smaller aperture value and a larger light throughput.

[0039] The axial distance from the image side of the fourth lens L4 to the object side of the fifth lens L5 is defined as d8, and the axial distance from the image side of the fifth lens L5 to the object side of the sixth lens L6 is defined as d10, satisfying the following relationship: 0.50≤d10 / d8≤2.50. This specifies the ratio of the air gap between the fifth and sixth lenses to the air gap between the fourth and fifth lenses. By reasonably allocating the air gap between the lenses, it is beneficial to reduce the assembly difficulty in the actual production process and improve the yield rate.

[0040] The central radius of curvature of the object side of the first lens L1 is defined as R1, and the central radius of curvature of the image side of the first lens L1 is defined as R2, and the following relationship is satisfied: 0.50≤R1 / R2≤2.00. This defines the shape of the first lens L1. Within the range of the condition, it is beneficial to mitigate the degree of light deflection after passing through the lens, and to reduce aberrations, so that |RMS|≤1.03μm for different fields of view.

[0041] In this embodiment, the first lens L1 has positive refractive power, and the object-side surface of the first lens L1 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the first lens L1 may also have negative refractive power.

[0042] The focal length of the entire 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: -338.86 ≤ f1 / f ≤ 8.90, which specifies the ratio of the focal length of the first lens L1 to the overall focal length. By controlling the negative optical power of the first lens L1 within a reasonable range, it is beneficial to correct the aberrations of the optical system. Preferably, it satisfies -211.79 ≤ f1 / f ≤ 7.12.

[0043] The first lens L1 has an on-axis thickness of d1, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.03≤d1 / TTL≤0.28, which is beneficial for achieving low aberrations. Preferably, 0.05≤d1 / TTL≤0.22.

[0044] In this embodiment, the second lens L2 has positive refractive power, and the object side of the second lens L2 is convex near the axis, while the image side is concave near the axis.

[0045] The focal length of the entire 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: 0.21≤f2 / f≤0.97, which specifies the ratio of the focal length of the second lens L2 to the overall focal length. Within the specified range, the second lens L2 has appropriate positive refractive power, which is beneficial for reducing system aberrations and also for the development of lenses with low aberrations and periscope-like telephoto capabilities, satisfying 0.34≤f2 / f≤0.77.

[0046] 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: -2.89≤(R3+R4) / (R3-R4)≤-0.51; the shape of the second lens L2 is specified. When within the specified range, as the lens develops towards periscope telephoto, it is beneficial to correct the on-axis chromatic aberration problem. Preferably, it satisfies -1.80≤(R3+R4) / (R3-R4)≤-0.63.

[0047] The second lens L2 has an on-axis thickness of d3, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.03≤d3 / TTL≤0.13, which is beneficial for achieving low aberrations. Preferably, it satisfies 0.04≤d3 / TTL≤0.10.

[0048] In this embodiment, the third lens L3 has negative refractive power, and the object side of the third lens L3 is concave near the axis, and the image side is concave near the axis.

[0049] The focal length of the third lens L3 is defined as f3, satisfying the following relationship: -0.51≤f3 / f≤-0.15. This limitation on the third lens L3 effectively smooths the light angle of the camera lens and reduces tolerance sensitivity. Preferably, it satisfies -0.32≤f3 / f≤-0.18.

[0050] 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: 0.19≤(R5+R6) / (R5-R6)≤1.08. This specifies the shape of the third lens L3. Within this range, with the development of periscope telephoto lenses, it is beneficial for correcting aberrations at off-axis angles. Preferably, it satisfies 0.30≤(R5+R6) / (R5-R6)≤0.86.

[0051] The on-axis 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: 0.01≤d5 / TTL≤0.08, which is beneficial for achieving low aberrations. Preferably, it satisfies 0.01≤d5 / TTL≤0.06.

[0052] In this embodiment, the fourth lens L4 has positive refractive power, and both the object-side and image-side surfaces of the fourth lens L4 are convex near the axis. In other optional embodiments, the fourth lens L4 may also have negative refractive power.

[0053] The focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: -84.72 ≤ f4 / f ≤ 0.89. This specifies the ratio of the focal length of the fourth lens L4 to the overall focal length, which helps improve the performance of the optical system within the conditional range. Preferably, it satisfies -52.95 ≤ f4 / f ≤ 0.71.

[0054] 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: -0.77≤(R7+R8) / (R7-R8)≤46.29, which defines the shape of the fourth lens L4. When within this range, with the development of periscope telephoto lenses, it is beneficial to correct aberrations and other problems at off-axis angles. Preferably, it satisfies -0.48≤(R7+R8) / (R7-R8)≤37.03.

[0055] 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≤0.11, which is beneficial for achieving low aberrations. Preferably, it satisfies 0.03≤d7 / TTL≤0.09.

[0056] In this embodiment, the fifth lens L5 has negative refractive power, and the object-side surface of the fifth lens L5 is convex near the axis, while the image-side surface is concave near the axis. In other optional embodiments, the fifth lens L5 may also have positive refractive power.

[0057] The focal length of the fifth lens L5 is defined as f5, satisfying the following relationship: -39.64 ≤ f5 / f ≤ 2162.66. This specifies the ratio of the focal length of the fifth lens L5 to the overall focal length, which helps improve the performance of the optical system within the conditional range. Preferably, it satisfies -24.78 ≤ f5 / f ≤ 1730.13.

[0058] 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: -2.44≤(R9+R10) / (R9-R10)≤185.41. This defines the shape of the fifth lens L5. When within this range, with the development of periscope telephoto lenses, it is beneficial for correcting aberrations at off-axis angles. Preferably, it satisfies -1.52≤(R9+R10) / (R9-R10)≤148.33.

[0059] 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: 0.01≤d9 / TTL≤0.13, which is beneficial for achieving low aberrations. Preferably, it satisfies 0.01≤d9 / TTL≤0.10.

[0060] In this embodiment, the sixth lens L6 has positive refractive power, and the object side of the sixth lens L6 is convex near the axis, while the image side is concave near the axis.

[0061] The focal length of the sixth lens L6 is defined as f6, satisfying the following relationship: 0.45 ≤ f6 / f ≤ 1.68. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies 0.71 ≤ f6 / f ≤ 1.34.

[0062] 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: -14.94≤(R11+R12) / (R11-R12)≤-2.39. This specifies the shape of the sixth lens L6. Within this range, with the development of periscope telephoto lenses, it is beneficial for correcting aberrations at off-axis angles. Preferably, it satisfies -9.34≤(R11+R12) / (R11-R12)≤-2.98.

[0063] The sixth lens L6 has an on-axis thickness of d11, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.02≤d11 / TTL≤0.15, which is beneficial for achieving low aberrations. Preferably, it satisfies 0.04≤d11 / TTL≤0.12.

[0064] In this embodiment, the ratio of the total optical length TTL of the camera optical lens 10 to the full field of view image height (diagonal direction) IH is less than or equal to 3.67, which is beneficial to reduce the total optical length. Preferably, it is less than or equal to 3.57.

[0065] When the above relationships are satisfied, the camera optical lens 10 possesses excellent optical performance. Furthermore, by employing a freeform surface, the designed image area can be matched with the actual usage area, maximizing the image quality of the effective area. Based on the characteristics of this camera optical lens 10, it is particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other imaging elements. The camera optical lens 10 of the present invention will be described below with examples. The specifications described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0066] TTL: Total optical length (the axial distance from the object surface of the first lens L1 to the imaging surface Si), in mm.

[0067] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens 10.

[0068] Tables 1, 2 and 3 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0069] Table 1

[0070]

[0071] The meanings of each of the following are as follows:

[0072] S1: Aperture (In this embodiment, aperture S1 is disposed on the object side of the second lens L2);

[0073] R: Radius of curvature at the center of the optical surface;

[0074] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0075] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0076] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0077] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0078] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0079] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0080] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0081] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0082] R9: The central radius of curvature of the object-side surface of the fifth lens L5;

[0083] R10: The central radius of curvature of the image-side surface of the fifth lens L5;

[0084] R11: The central radius of curvature of the object-side surface of the sixth lens L6;

[0085] R12: The central radius of curvature of the image-side surface of the sixth lens L6;

[0086] R13: The center radius of curvature of the object side surface of the optical filter GF;

[0087] R14: Radius of curvature of the center of the image side of the optical filter GF;

[0088] d: The axial thickness of the lens and the axial distance between lenses;

[0089] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0090] d1: On-axis thickness of the first lens L1;

[0091] 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;

[0092] d3: On-axis thickness of the second lens L2;

[0093] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0094] d5: On-axis thickness of the third lens L3;

[0095] 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;

[0096] d7: On-axis thickness of the fourth lens L4;

[0097] 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;

[0098] d9: On-axis thickness of the fifth lens L5;

[0099] d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

[0100] d11: On-axis thickness of the sixth lens L6;

[0101] d12: The on-axis distance between the image-side optical filter GF of the sixth lens L6 and the object-side optical filter GF;

[0102] d13: On-axis thickness of the optical filter GF;

[0103] d14: The axial distance from the image-side surface of the optical filter GF to the image plane;

[0104] nd: Refractive index of the d-line;

[0105] nd1: The refractive index of the d-line of the first lens L1;

[0106] nd2: The refractive index of the d-line of the second lens L2;

[0107] nd3: The refractive index of the d-line of the third lens L3;

[0108] nd4: The refractive index of the d-line of the fourth lens L4;

[0109] nd5: The refractive index of the d-line of the fifth lens L5;

[0110] nd6: The refractive index of the d-line of the sixth lens L6;

[0111] ndg: The refractive index of the d-line of the optical filter GF;

[0112] vd: Abbe number;

[0113] v1: Abbe number of the first lens L1;

[0114] v2: Abbe number of the second lens L2;

[0115] v3: Abbe number of the third lens L3;

[0116] v4: Abbe number of the fourth lens L4;

[0117] v5: Abbe number of the fifth lens L5;

[0118] v6: Abbe number of the sixth lens L6;

[0119] vg: Abbe number of the optical filter GF;

[0120] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0121] Table 2

[0122]

[0123]

[0124] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r8 +A10r 10 +A12r 12 +A14r 14 +

[0125] A16r 16 +A18r 18 +A20r 20 (1)

[0126] 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).

[0127] For convenience, the aspherical surfaces of each lens surface are those shown in formula (1) above. However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0128] Table 3 shows the freeform surface data in the camera optical lens 10 of the first embodiment of the present invention.

[0129] Table 3

[0130]

[0131]

[0132] Where k is the conic coefficient, Bi is the freeform surface coefficient, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the freeform surface and the optical axis, x is the x-component of r, y is the y-component of r, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis).

[0133] For convenience, each freeform surface uses the extended polynomial form shown in formula (2) above. However, the present invention is not limited to the freeform surface polynomial form represented by formula (2).

[0134] Figure 2 The RMS spot diameter of the camera optical lens 10 in the first embodiment is shown in the first quadrant. Figure 2 It can be seen that the camera optical lens 10 of the first embodiment can achieve good imaging quality.

[0135] Table 19, which appears later, shows the values ​​corresponding to various numerical values ​​and the parameters specified in the conditional expressions for each example.

[0136] As shown in Table 19, the first embodiment satisfies all the conditional expressions.

[0137] In this embodiment, the object-side and image-side surfaces of the first lens L1 and the fifth lens L5 are both freeform surfaces, the object-side and image-side surfaces of the fourth lens L4 and the object-side surface of the sixth lens L6 are spherical, and the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.6 mm, the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 1.98 mm, and the entrance pupil diameter ENPD of the imaging optical lens 10 is 6.036 mm. The full field-of-view image height (diagonal direction) IH is 7.000mm, the x-direction image height is 5.600mm, and the y-direction image height is 4.200mm. The imaging effect is optimal within this rectangular range. The diagonal field of view (FOV) is 21.08°, the x-direction field of view is 17.01°, and the y-direction field of view is 12.83°. The camera optical lens 10 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0138] (Second Implementation)

[0139] The second implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0140] Figure 3 The image shown is a camera optical lens 20 according to the second embodiment of the present invention. In this embodiment, the object side of the fifth lens L5 is concave at the paraxial position.

[0141] Tables 4, 5 and 6 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0142] Table 4

[0143]

[0144] Table 5 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0145]

[0146]

[0147] Table 6 shows the freeform surface data in the camera optical lens 20 of the second embodiment of the present invention.

[0148] Table 6

[0149]

[0150] Figure 4 The RMS spot diameter of the camera optical lens 20 in the second embodiment is shown in the first quadrant. Figure 4 It can be seen that the camera optical lens 20 of the second embodiment can achieve good imaging quality.

[0151] As shown in Table 19, the second embodiment satisfies all the conditional expressions.

[0152] In this embodiment, the object-side and image-side surfaces of the first lens L1 are both freeform surfaces, while the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.6 mm, and the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 3.26 mm. The entrance pupil diameter ENPD of the imaging optical lens 10 is 7.745 mm, the full field of view image height (diagonal direction) IH is 7.000 mm, the image height in the x direction is 5.600 mm, and the image height in the y direction is 4.200 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 21.32°, the field of view in the x direction is 17.12°, and the field of view in the y direction is 12.88°. The imaging optical lens 20 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0153] (Third Implementation)

[0154] The third implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0155] Figure 5 The image shown is a camera optical lens 30 according to the third embodiment of the present invention. In this embodiment, the first lens L1 has negative refractive power, the image side of the second lens L2 is convex at the paraxial position, the fourth lens L4 has negative refractive power, the image side of the fourth lens L4 is concave at the paraxial position, and the fifth lens L5 has positive refractive power.

[0156] Tables 7, 8 and 9 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0157] Table 7

[0158]

[0159]

[0160] Table 8 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0161] Table 8

[0162]

[0163] Table 9 shows the freeform surface data in the camera optical lens 30 of the third embodiment of the present invention.

[0164] Table 9

[0165]

[0166]

[0167] Figure 6 The RMS spot diameter of the camera optical lens 30 in the third embodiment is shown in the first quadrant. Figure 6 It can be seen that the camera optical lens 30 of the third embodiment can achieve good imaging quality.

[0168] Table 19 below lists the values ​​of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical system of this embodiment satisfies the above-described conditional expressions.

[0169] In this embodiment, the object-side and image-side surfaces of the first lens L1, the fourth lens L4, and the fifth lens L5 are all freeform surfaces, while the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.88 mm, and the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 1.49 mm. The entrance pupil diameter ENPD of the imaging optical lens 10 is 5.393 mm, the full field of view image height (diagonal direction) IH is 7.000 mm, the image height in the x direction is 5.600 mm, and the image height in the y direction is 4.200 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 21.15°, the field of view in the x direction is 17.02°, and the field of view in the y direction is 12.83°. The imaging optical lens 10 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0170] (Fourth Implementation)

[0171] The fourth implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0172] Figure 7 The image shown is a camera optical lens 40 according to the fourth embodiment of the present invention. In this embodiment, the image side of the second lens L2 is convex at the paraxial position.

[0173] Tables 10, 11 and 12 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0174] Table 10

[0175]

[0176] Table 11 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0177] Table 11

[0178]

[0179] Table 12 shows the freeform surface data in the camera optical lens 40 according to the fourth embodiment of the present invention.

[0180] Table 12

[0181]

[0182]

[0183] Figure 8 The RMS spot diameter of the camera optical lens 40 in the fourth embodiment is shown in the first quadrant. Figure 8 It can be seen that the camera optical lens 40 of the fourth embodiment can achieve good imaging quality.

[0184] Table 19 below lists the values ​​of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical system of this embodiment satisfies the above-described conditional expressions.

[0185] In this embodiment, the object-side and image-side surfaces of the first lens L1 are both freeform surfaces, while the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.60 mm, and the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 2.00 mm. The entrance pupil diameter ENPD of the imaging optical lens 10 is 6.066 mm, the full field of view image height (diagonal direction) IH is 7.000 mm, the image height in the x direction is 5.600 mm, and the image height in the y direction is 4.200 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 21.22°, the field of view in the x direction is 17.07°, and the field of view in the y direction is 12.86°. The imaging optical lens 10 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0186] (Fifth Implementation)

[0187] The fifth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as the first embodiment. Only the differences are listed below.

[0188] Figure 9 The image shows a camera optical lens 50 according to the fifth embodiment of the present invention. In this embodiment, the image side of the second lens L2 is convex at the paraxial position, and the fifth lens L5 has positive refractive power.

[0189] Tables 13, 14 and 15 show the design data of the camera optical lens 50 according to the fifth embodiment of the present invention.

[0190] Table 13

[0191]

[0192]

[0193] Table 14 shows the aspherical data of each lens in the camera optical lens 50 of the fifth embodiment of the present invention.

[0194] Table 14

[0195]

[0196]

[0197] Table 15 shows the freeform surface data in the camera optical lens 50 according to the fifth embodiment of the present invention.

[0198] Table 15

[0199]

[0200] Figure 10 The RMS spot diameter of the camera optical lens 50 in the fifth embodiment is shown in the first quadrant. Figure 10 It can be seen that the camera optical lens 50 of the fifth embodiment can achieve good imaging quality.

[0201] Table 19 below lists the values ​​of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical system of this embodiment satisfies the above-described conditional expressions.

[0202] In this embodiment, the object-side and image-side surfaces of the first lens L1 are both freeform surfaces, while the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.61 mm, and the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 2.15 mm. The entrance pupil diameter ENPD of the imaging optical lens 10 is 6.297 mm, the full field of view image height (diagonal direction) IH is 7.000 mm, the image height in the x direction is 5.600 mm, and the image height in the y direction is 4.200 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 21.34°, the field of view in the x direction is 17.13°, and the field of view in the y direction is 12.88°. The imaging optical lens 10 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0203] (Sixth Implementation Method)

[0204] The sixth embodiment is basically the same as the first embodiment, and the symbols have the same meanings as the first embodiment. Only the differences are listed below.

[0205] Figure 11 The image shown is a camera optical lens 60 according to the sixth embodiment of the present invention. In this embodiment, the image side of the second lens L2 is convex at the paraxial position.

[0206] Tables 16, 17 and 18 show the design data for the camera optical lens 60 according to the sixth embodiment of the present invention.

[0207] Table 16

[0208]

[0209] Table 17 shows the aspherical data of each lens in the camera optical lens 60 of the sixth embodiment of the present invention.

[0210] Table 17

[0211]

[0212] Table 18 shows the freeform surface data in the camera optical lens 60 according to the sixth embodiment of the present invention.

[0213] Table 18

[0214]

[0215]

[0216] Figure 12The RMS spot diameter of the camera optical lens 60 in the sixth embodiment is shown in the first quadrant. Figure 12 It can be seen that the camera optical lens 60 of the sixth embodiment can achieve good imaging quality.

[0217] Table 19 below lists the values ​​of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical system of this embodiment satisfies the above-described conditional expressions.

[0218] In this embodiment, the object-side and image-side surfaces of the first lens L1 are both freeform surfaces, while the surfaces of the remaining lenses are ordinary aspherical surfaces. The effective radius DTX1 of the object-side surface of the first lens L1 in the X direction is 4.60 mm, and the effective radius DTY1 of the object-side surface of the first lens L1 in the Y direction is 2.10 mm. The entrance pupil diameter ENPD of the imaging optical lens 10 is 6.216 mm, the full field of view image height (diagonal direction) IH is 7.000 mm, the image height in the x direction is 5.600 mm, and the image height in the y direction is 4.200 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 21.29°, the field of view in the x direction is 17.11°, and the field of view in the y direction is 12.87°. The imaging optical lens 10 meets the design requirements of periscope telephoto, low aberration, and large aperture. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0219] Table 10

[0220]

[0221]

[0222] 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 six lenses, and the six lenses are sequentially arranged from the object side to the image side as follows: a first lens with refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with refractive power, and a sixth lens with positive refractive power; At least one of the first lens to the sixth lens contains a free-form surface, the effective radius of the object side surface of the first lens in the X direction is DTX1, the effective radius of the object side surface of the first lens in the Y direction is DTY1, the focal length of the first lens is f1, the focal length of the fourth lens is f4, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the axial distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, and the following relationships are satisfied: 1.40≤DTX1 / DTY1≤3.00; 4.00≤f1 / f4≤10.00; 0.50≤d4 / d6≤2.

00.

2. The camera optical lens according to claim 1, characterized in that: The aperture value of the camera optical lens is FNO, and the following relationship is satisfied: 2.40≤FNO≤3.

50.

3. The camera optical lens according to claim 1, characterized in that: The axial distance from the image side surface of the fourth lens to the object side surface of the fifth lens is d8, the axial distance from the image side surface of the fifth lens to the object side surface of the sixth lens is d10, and the following relationship is satisfied: 0.50≤d10 / d8≤2.

50.

4. The camera optical lens according to claim 1, characterized in that: The central curvature radius of the object side surface of the first lens is R1, the central curvature radius of the image side surface of the first lens is R2, and the following relationship is satisfied: 0.50≤R1 / R2≤2.

00.

5. The camera optical lens according to claim 1, characterized in that: The focal length of the camera optical lens as a whole is f, the on-axis thickness of the first lens is d1, the total optical length of the camera optical lens is TTL, and the following relationships are satisfied: -338.86≤f1 / f≤8.90; 0.03≤d1 / TTL≤0.

28.

6. The camera optical lens according to claim 1, characterized in that: The focal length of the camera optical lens as a whole is f, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the camera optical lens is TTL, and the following relationships are satisfied: 0.21≤f2 / f≤0.97; -2.89≤(R3+R4) / (R3-R4)≤-0.51; 0.03≤d3 / TTL≤0.

13.

7. The camera optical lens according to claim 1, characterized in that: The focal length of the camera optical lens as a whole is f, the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, the total optical length of the camera optical lens is TTL, and the following relationships are satisfied: -0.51≤f3 / f≤-0.15; 0.19≤(R5+R6) / (R5-R6)≤1.08; 0.01≤d5 / TTL≤0.

08. 8.The camera optical lens according to claim 1, characterized in that: The focal length of the camera lens is f, the focal length of the fourth lens is f4, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, the total optical length of the camera lens is TTL, and the following relationships are satisfied: -84.72≤f4 / f≤0.89; -0.77≤(R7+R8) / (R7-R8)≤46.29; 0.02≤d7 / TTL≤0.

11. 9.The camera optical lens according to claim 1, characterized in that: The focal length of the camera lens is f, the focal length of the fifth lens is f5, the central curvature radius of the object side of the fifth lens is R9, the central curvature radius of the image side of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, the total optical length of the camera lens is TTL, and the following relationships are satisfied: -39.64≤f5 / f≤2162.66; -2.44≤(R9+R10) / (R9-R10)≤185.41; 0.01≤d9 / TTL≤0.

13. 10.The camera optical lens according to claim 1, characterized in that: The focal length of the camera lens is f, the focal length of the sixth lens is f6, the central curvature radius of the object side of the sixth lens is R11, the central curvature radius of the image side of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, the total optical length of the camera lens is TTL, and the following relationships are satisfied: 0.45≤f6 / f≤1.68; -14.94≤(R11+R12) / (R11-R12)≤-2.39; 0.02≤d11 / TTL≤0.15.

Images