Image capturing optical lens
By optimizing the relationship between the focal length, radius of curvature, and thickness of the four lenses, a camera optical lens suitable for high-pixel camera elements was designed, solving the problem of insufficient optical performance of miniaturized camera lenses and achieving excellent imaging results.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHANGZHOU RAYTECH OPTRONICS CO LTD
- Filing Date
- 2024-11-05
- Publication Date
- 2026-05-15
AI Technical Summary
Existing miniaturized camera optical lenses lack sufficient optical performance for high-pixel camera elements, making it difficult to meet imaging quality requirements.
A camera optical lens was designed, comprising four lenses, each with positive and negative refractive power. By optimizing the relationship between the lens focal length, radius of curvature, and thickness, good optical performance was achieved.
It achieves excellent optical characteristics and imaging quality, is suitable for high-pixel CCD and CMOS camera elements, and features a large aperture, wide-angle lens, and ultra-thin design.
Smart Images
Figure CN2024129807_15052026_PF_FP_ABST
Abstract
Description
Camera optical lens Technical Field
[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for handheld terminal devices such as smartphones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Technology
[0002] In recent years, with the rise of 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, four-element lens structures are gradually appearing in lens designs. There is an urgent need for camera lenses with excellent optical performance.
[0003] Summary of the Invention
[0004] To address the aforementioned problems, the present invention aims to provide a camera optical lens that meets the design requirements for good optical performance.
[0005] To solve the above-mentioned technical problems, embodiments of the present invention provide a camera optical lens, which comprises, from the object side to the image side, the following in sequence: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having negative refractive power;
[0006] 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 focal length of the third lens is f3, the focal length of the fourth lens is f4, and the combined focal length of the second, third, and fourth lenses is f234. The central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the first lens is d1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, and the axial thickness of the fourth lens is d7, and the following relationship is satisfied:
[0007] 0.65≤f1 / f≤0.85;
[0008] -1.50≤(f3-f4) / f2≤-0.80;
[0009] 0.20≤(R3+R4) / f2≤0.80;
[0010] 2.00≤d1 / d3≤7.00;
[0011] -3.50≤f234 / (d3+d5+d7)≤-2.50.
[0012] Preferably, the central radius of curvature of the object-side surface of the third lens is R5, and the central radius of curvature of the image-side surface of the third lens is R6, and the following relationship is satisfied:
[0013] 2.00≤(R5+R6) / (R5-R6)≤3.00.
[0014] Preferably, the sum of the on-axis thicknesses of the first lens, the second lens, the third lens, and the fourth lens is ∑Ti, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
[0015] 0.50≤∑Ti / TTL≤0.70.
[0016] 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 also convex at the paraxial position; the axial thickness of the first lens is d1, the central radius of curvature of the object-side surface of the first lens is R1, the central radius of curvature of the image-side surface of the first lens is R2, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship:
[0017] -1.41≤(R1+R2) / (R1-R2)≤-0.28;
[0018] 1.63≤d1 / TTL≤6.17.
[0019] Preferably, the object-side surface of the second lens is concave at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position; the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:
[0020] -4.23≤f² / f≤-0.84;
[0021] 0.04≤(R3+R4) / (R3-R4)≤0.42;
[0022] 0.30≤d3 / TTL≤2.79.
[0023] Preferably, the object-side surface of the third lens is concave at the paraxial position, and the image-side surface of the third lens is convex at the paraxial position; the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:
[0024] 0.39≤f3 / f≤1.51;
[0025] 1.83≤d5 / TTL≤8.32.
[0026] Preferably, the object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is concave at the paraxial position; the central radius of curvature of the object-side surface of the fourth lens is R7, the central radius of curvature of the image-side surface of the fourth lens is R8, and the total optical length of the camera lens is TTL, and satisfies the following relationship:
[0027] -1.76≤f4 / f≤-0.48;
[0028] 0.97≤(R7+R8) / (R7-R8)≤3.63;
[0029] 1.10≤d7 / TTL≤4.76.
[0030] Preferably, the aperture value FNO of the camera optical lens is less than or equal to 2.96.
[0031] Preferably, the total optical length of the camera lens is TTL, the image height of the camera lens is IH, and the following relationship is satisfied:
[0032] TTL / IH≤1.67.
[0033] Preferably, the combined focal length of the first lens and the second lens is f12, and satisfies the following relationship:
[0034] 0.52≤f12 / f≤1.82.
[0035] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical characteristics and good optical performance, 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
[0036] 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:
[0037] Figure 1 is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;
[0038] Figure 2 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 1;
[0039] Figure 3 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 1;
[0040] Figure 4 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 1;
[0041] Figure 5 is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;
[0042] Figure 6 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 5;
[0043] Figure 7 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 5;
[0044] Figure 8 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 5;
[0045] Figure 9 is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;
[0046] Figure 10 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 9;
[0047] Figure 11 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 9;
[0048] Figure 12 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 9;
[0049] Figure 13 is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention;
[0050] Figure 14 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 13;
[0051] Figure 15 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 13;
[0052] Figure 16 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 13;
[0053] Figure 17 is a schematic diagram of the structure of the camera optical lens of the comparative embodiment of the present invention;
[0054] Figure 18 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 17;
[0055] Figure 19 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 17;
[0056] Figure 20 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 17. Detailed Implementation
[0057] 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.
[0058] Referring to Figures 1-16, the present invention provides camera optical lenses 10, 20, 30, and 40. Figures 1, 5, 9, and 13 show camera optical lenses 10, 20, 30, and 40 of the present invention, respectively. These camera optical lenses 10, 20, 30, and 40 comprise a total of four lenses, specifically, in the following order from the object side to the image side: aperture S1, first lens L1, second lens L2, third lens L3, and fourth lens L4. An optical filter GF or other optical element may be disposed between the fourth lens L4 and the image plane S1.
[0059] The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, and the fourth lens L4 has negative refractive power. In other optional embodiments, the refractive power of the above lenses can also be set to other positive and negative distributions.
[0060] 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: 0.65≤f1 / f≤0.85. Within this range, the focal length value of the first lens L1 can be controlled. By reasonably allocating the focal length, it is beneficial to control temperature drift and achieve good temperature performance.
[0061] The focal length of the second lens L2 is defined as f2, the focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: -1.50≤(f3-f4) / f2≤-0.80. Within the range of the relationship, by reasonably allocating the focal length of the camera optical lens, the camera optical lens can have better imaging quality and lower sensitivity.
[0062] The center radius of curvature of the object side of the second lens L2 is defined as R3, and the center radius of curvature of the image side of the second lens L2 is defined as R4, satisfying the following relationship: 0.20≤(R3+R4) / f2≤0.80. Within the range of the relationship, by reasonably controlling the surface shape of the second lens L2, it is beneficial to reduce the sensitivity of the camera optical lens. In addition, the manufacturing yield can be improved by reducing the molding difficulty. At the same time, it can also reduce the stray light generated by the camera optical lens and improve the imaging quality of the camera optical lens.
[0063] The on-axis thickness of the first lens L1 is defined as d1, and the on-axis thickness of the second lens L2 is defined as d3, satisfying the following relationship: 2.00≤d1 / d3≤7.00. This relationship specifies the ratio of the on-axis thickness of the first lens L1 and the second lens L2. By reasonably allocating the lens thickness, it is beneficial to reduce the molding difficulty in the actual production process and improve the yield rate.
[0064] The combined focal length of the second lens L2, the third lens L3, and the fourth lens L4 is defined as f234. The on-axis thickness of the second lens L2 is d3, the on-axis thickness of the third lens L3 is d5, and the on-axis thickness of the fourth lens L4 is d7, satisfying the following relationship: -3.50≤f234 / (d3+d5+d7)≤-2.50. Within this range, the rear lens can maintain a sufficiently strong negative refractive force to correct off-axis aberrations at the image side, while effectively shortening the total optical length to achieve miniaturization and thus expanding the application range of the product.
[0065] Under the condition of satisfying the above relationships, the camera optical lenses 10, 20, 30, and 40 have good optical performance and can meet the design requirements of large aperture, wide angle and ultra-thinness. Based on the characteristics of the camera optical lenses 10, 20, 30, and 40, they are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.
[0066] Based on the above relationships and the functions that can be achieved, the characteristics of each lens are further refined as follows.
[0067] The object-side surface of the first lens L1 is convex near the axis, and the image-side surface of the first lens L1 is also convex near the axis. The object-side surface of the second lens L2 is concave near the axis, and the image-side surface of the second lens L2 is also concave near the axis. The object-side surface of the third lens L3 is concave near the axis, and the image-side surface of the third lens L3 is convex near the axis. The object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface of the fourth lens L4 is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the above lenses may also be configured with other concave and convex distributions.
[0068] In addition, the center radius of curvature of the object side of the third lens L3 is R5, and the center radius of curvature of the image side of the third lens L3 is R6, and they satisfy the following relationship: 2.00≤(R5+R6) / (R5-R6)≤3.00. This relationship defines the shape of the third lens L3, which is beneficial to correcting the astigmatism and distortion of the camera optical lens 10, making the distortion|Distortion|≤5%, and reducing the possibility of vignetting.
[0069] The sum of the on-axis thicknesses of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 is defined as ∑Ti, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.50≤∑Ti / TTL≤0.70. This relationship specifies the ratio of the sum of the on-axis thicknesses of all lenses to the total optical length. By reasonably allocating the proportion of lens thickness, it is helpful to achieve ultra-thinness.
[0070] The center radius of curvature of the object-side surface of the first lens L1 is R1, and the center radius of curvature of the image-side surface of the first lens L2 is R2, satisfying the following relationship: -1.41≤(R1+R2) / (R1-R2)≤-0.28, which defines the shape of the first lens L1. Within this range, it helps to achieve an ultra-wide-angle lens. Preferably, it satisfies -0.88≤(R1+R2) / (R1-R2)≤-0.35.
[0071] The first lens L1 also satisfies the following relationship: 1.63≤d1 / TTL≤6.17, which is within the range of the relationship and is beneficial for miniaturization. Preferably, it satisfies 2.61≤d1 / TTL≤4.94.
[0072] The second lens L2 satisfies the following relationship: -4.23 ≤ f2 / f ≤ -0.84, which specifies the ratio of the focal length f2 of the second lens L2 to the focal length of the imaging optical lens 10. Within this range, the field curvature of the system can be effectively balanced. Preferably, it satisfies -2.64 ≤ f2 / f ≤ -1.05.
[0073] The second lens L2 also satisfies the following relationship: 0.04≤(R3+R4) / (R3-R4)≤0.42, which defines the shape of the second lens L2. Within this range, it helps to achieve an ultra-wide-angle lens. Preferably, it satisfies 0.06≤(R3+R4) / (R3-R4)≤0.34.
[0074] The second lens L2 also satisfies the following relationship: 0.30≤d3 / TTL≤2.79, which is beneficial for miniaturization. Preferably, it satisfies 0.48≤d3 / TTL≤2.23.
[0075] The third lens L3 satisfies the following relationship: 0.39 ≤ f3 / f ≤ 1.51. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, it satisfies 0.63 ≤ f3 / f ≤ 1.21.
[0076] The third lens L3 also satisfies the following relationship: 1.83≤d5 / TTL≤8.32, which is beneficial for miniaturization. Preferably, it satisfies 2.92≤d5 / TTL≤6.66.
[0077] The fourth lens L4 satisfies the following relationship: -1.76 ≤ f4 / f ≤ -0.48. This relationship defines the ratio of the focal length of the fourth lens L4 to that of the imaging optical lens 10. By rationally allocating the focal length of the imaging optical lens 10, the imaging optical lens 10 can achieve good sensitivity performance while meeting the design requirements of a large aperture. Preferably, it satisfies -1.10 ≤ f4 / f ≤ -0.60.
[0078] 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: 0.97≤(R7+R8) / (R7-R8)≤3.63. This defines the shape of the fourth lens L4. Within this range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations in off-axis drawing angles. Preferably, it satisfies 1.56≤(R7+R8) / (R7-R8)≤2.91.
[0079] The fourth lens L4 also satisfies the following relationship: 1.10≤d7 / TTL≤4.76, which is beneficial for miniaturization. Preferably, it satisfies 1.75≤d7 / TTL≤3.81.
[0080] In this embodiment, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all made of plastic. In other alternative embodiments, the lenses may be made of other materials.
[0081] In this embodiment, the field of view (FOV) along the diagonal direction of the camera optical lens 10 is defined as FOV, satisfying the following relationship: FOV ≥ 72.78°, which is beneficial for achieving a wide-angle view. Preferably, FOV ≥ 73.53° is satisfied.
[0082] In this embodiment, the image height of the camera optical lens 10 is IH, and it satisfies the following relationship: TTL / IH≤1.67, which is beneficial for miniaturization. Preferably, it satisfies TTL / IH≤1.62.
[0083] In this embodiment, the aperture value FNO of the camera optical lens 10 is less than or equal to 2.93, thereby achieving a large aperture and good imaging performance of the camera optical lens.
[0084] The combined focal length of the first lens L1 and the second lens L2 is f12, and satisfies the following relationship: 0.52 ≤ f12 / f ≤ 1.82. This relationship defines the ratio of the combined focal length f12 of the first lens L1 and the second lens L2 to the focal length f of the imaging optical lens 10. Within the range of this relationship, aberrations and distortions of the imaging optical lens 10 can be eliminated, and the back focal length of the imaging optical lens 10 can be suppressed, maintaining the miniaturization of the imaging optical lens 10. Preferably, 0.83 ≤ f12 / f ≤ 1.46.
[0085] The camera optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.
[0086] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm;
[0087] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.
[0088] The technical solution of the present invention will be described in detail below with four embodiments. At the same time, a comparative embodiment is provided for reference. The technical effects of the present invention cannot be achieved when the above-mentioned relationship is not exceeded.
[0089] (First Implementation)
[0090] Table 1 shows the design data of the camera optical lens 10 according to the first embodiment of the present invention.
[0091] Table 1
[0092] The meanings of each symbol are as follows.
[0093] S1: Aperture;
[0094] R: Radius of curvature at the center of the optical surface;
[0095] R1: The central radius of curvature of the object-side surface of the first lens L1;
[0096] R2: The central radius of curvature of the image-side surface of the first lens L1;
[0097] R3: The central radius of curvature of the object-side surface of the second lens L2;
[0098] R4: The central radius of curvature of the image-side surface of the second lens L2;
[0099] R5: The central radius of curvature of the object-side surface of the third lens L3;
[0100] R6: The central radius of curvature of the image-side surface of the third lens L3;
[0101] R7: The central radius of curvature of the object side surface of the fourth lens L4;
[0102] R8: The central radius of curvature of the image-side surface of the fourth lens L4;
[0103] R9: The center radius of curvature of the object side surface of the optical filter GF;
[0104] R10: Radius of curvature of the center of the image side of the optical filter GF;
[0105] d: Axial thickness of the lens, axial distance between lenses;
[0106] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;
[0107] d1: On-axis thickness of the first lens L1;
[0108] 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;
[0109] d3: On-axis thickness of the second lens L2;
[0110] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
[0111] d5: On-axis thickness of the third lens L3;
[0112] 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;
[0113] d7: On-axis thickness of the fourth lens L4;
[0114] d8: The on-axis distance from the image side of the fourth lens L4 to the object side of the optical filter GF;
[0115] d9: On-axis thickness of the optical filter GF;
[0116] d10: The on-axis distance from the image-side surface of the optical filter GF to the image plane Si;
[0117] nd: Refractive index of the d-line (the d-line is green light with a wavelength of 555 nm);
[0118] nd1: The refractive index of the d-line of the first lens L1;
[0119] nd2: The refractive index of the d-line of the second lens L2;
[0120] nd3: The refractive index of the d-line of the third lens L3;
[0121] nd4: The refractive index of the d-line of the fourth lens L4;
[0122] ndg: The refractive index of the d-line of the optical filter GF;
[0123] vd: Abbe number;
[0124] v1: Abbe number of the first lens L1;
[0125] v2: Abbe number of the second lens L2;
[0126] v3: Abbe number of the third lens L3;
[0127] v4: Abbe number of the fourth lens L4;
[0128] vg: Abbe number of the optical filter GF.
[0129] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.
[0130] Table 2
[0131] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).
[0132] 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 +A28r 28 +A30r 30 (1)
[0133] 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).
[0134] Figures 2 and 3 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 430nm, 470nm, 510nm, 555nm, 610nm, and 650nm passes through the imaging optical lens 10 of the first embodiment, respectively. Figure 4 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the imaging 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.
[0135] Table 11, which appears later, shows the values corresponding to various numerical values and parameters specified in the conditional expressions in each embodiment.
[0136] As shown in Table 11, the first embodiment satisfies all the conditional expressions.
[0137] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 84.97°, the camera optical lens 10 has a large aperture and good optical performance, 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 5 shows the camera optical lens 20 of the second embodiment of the present invention.
[0141] Table 3 shows the design data of the camera optical lens 20 according to the second embodiment of the present invention.
[0142] Table 3
[0143] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.
[0144] Table 4
[0145] Figures 6 and 7 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm 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 555nm 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.
[0146] As shown in Table 11, the second embodiment satisfies all the conditional expressions.
[0147] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 85.01°, the camera optical lens 20 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
[0148] (Third Implementation)
[0149] 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.
[0150] Figure 9 shows the camera optical lens 30 of the third embodiment of the present invention.
[0151] Table 5 shows the design data of the camera optical lens 30 according to the third embodiment of the present invention.
[0152] Table 5
[0153] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.
[0154] Table 6
[0155] Figures 10 and 11 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 555 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.
[0156] Table 11 below lists the values of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical lens 30 of this embodiment satisfies the above-described conditional expressions.
[0157] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 75.07°, the camera optical lens 30 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
[0158] (Fourth Implementation)
[0159] 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.
[0160] Figure 13 shows the camera optical lens 40 of the fourth embodiment of the present invention.
[0161] Table 7 shows the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.
[0162] Table 7
[0163] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.
[0164] Table 8
[0165] Figures 14 and 15 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm 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 555nm 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.
[0166] Table 11 below lists the values of each conditional expression in this embodiment according to the above-described conditional expressions. Clearly, the camera optical lens 40 of this embodiment satisfies the above-described conditional expressions.
[0167] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 1.259 mm, the full field of view image height IH is 2.911 mm, and the field of view angle FOV in the diagonal direction is 74.27°. The camera optical lens 40 has a large aperture and good optical performance. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
[0168] (Comparative Implementation Methods)
[0169] The comparative 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.
[0170] Figure 17 shows the camera optical lens 50 of the comparative embodiment.
[0171] Table 9 shows the design data of the camera optical lens 50 of the comparative embodiment of the present invention.
[0172] Table 9
[0173] Table 10 shows the aspherical data of each lens in the camera optical lens 50 of the comparative embodiment of the present invention.
[0174] Table 10
[0175] Figures 18 and 19 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm passes through the camera optical lens 50 of the comparative embodiment, respectively. Figure 20 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the camera optical lens 50 of the comparative 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.
[0176] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 1.259 mm, the full field of view image height IH is 2.911 mm, and the field of view angle FOV in the diagonal direction is 87.27°.
[0177] Table 11 below lists the values of each conditional expression in the comparative embodiment according to the above conditional expressions. Obviously, the camera optical lens 50 of the comparative embodiment does not satisfy the above conditional expression 0.65≤f1 / f≤0.85, which is not conducive to controlling temperature drift and has good temperature performance.
[0178] Table 11
[0179] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.
Claims
1. A camera optical lens, characterized in that, The camera optical lens comprises, from the object side to the image side, the following in sequence: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth 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 focal length of the third lens is f3, the focal length of the fourth lens is f4, the combined focal length of the second, third, and fourth lenses is f234, 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 first lens is d1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, and the axial thickness of the fourth lens is d7, and the following relationship is satisfied: 0.65≤f1 / f≤0.85; -1.50≤(f3-f4) / f2≤-0.80; 0.20≤(R3+R4) / f2≤0.80; 2.00≤d1 / d3≤7.00; -3.50≤f234 / (d3+d5+d7)≤-2.
50.
2. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object side of the third lens is R5, and the central radius of curvature of the image side of the third lens is R6, and they satisfy the following relationship: 2.00≤(R5+R6) / (R5-R6)≤3.
00.
3. The camera optical lens according to claim 1, characterized in that, The sum of the on-axis thicknesses of the first lens, the second lens, the third lens, and the fourth lens is ∑Ti, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.50≤∑Ti / TTL≤0.
70.
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 convex at the paraxial position. The axial thickness of the first lens is d1, the central radius of curvature of the object-side surface of the first lens is R1, the central radius of curvature of the image-side surface of the first lens is R2, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: -1.41≤(R1+R2) / (R1-R2)≤-0.28; 1.63≤d1 / TTL≤6.
17.
5. The camera optical lens according to claim 1, characterized in that, The object-side surface of the second lens is concave at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. The total optical length of the camera lens is TTL, and satisfies the following relationship: -4.23≤f² / f≤-0.84; 0.04≤(R3+R4) / (R3-R4)≤0.42; 0.30≤d3 / TTL≤2.
79.
6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The total optical length of the camera lens is TTL, and satisfies the following relationship: 0.39≤f3 / f≤1.51; 1.83≤d5 / TTL≤8.
32.
7. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is concave at the paraxial position. The center radius of curvature of the object-side surface of the fourth lens is R7, the center radius of curvature of the image-side surface of the fourth lens is R8, the total optical length of the camera lens is TTL, and the following relationship is satisfied: -1.76≤f4 / f≤-0.48; 0.97≤(R7+R8) / (R7-R8)≤3.63; 1.10≤d7 / TTL≤4.
76.
8. The camera optical lens according to claim 1, characterized in that, The aperture value FNO of the camera optical lens is less than or equal to 2.
96.
9. The camera optical lens according to claim 1, characterized in that, The total optical length of the camera lens is TTL, the image height of the camera lens is IH, and the following relationship is satisfied: TTL / IH≤1.
67.
10. The camera optical lens according to claim 1, characterized in that, The combined focal length of the first lens and the second lens is f12, and satisfies the following relationship: 0.52≤f12 / f≤1.82.