Camera lens

Abstract

The application relates to the field of optical lenses and discloses a camera optical lens which comprises, in sequence from the object side to the image side, a first lens with negative refractive power, a second lens, a third lens with positive refractive power and a fourth lens with negative refractive power. The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, 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 first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, and the following relationships are satisfied: -5.00<=f1 / f<=-2.00; 0.40<=f3 / f<=0.70; -1.20<=f4 / f<=-0.80; 2.50<=(R3+R4) / (R3-R4)<=20.00; 1.20<=d1 / d2<=3.50.

Description

Technical Field

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

[0002] In recent years, with the rise of 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 wide-angle camera lenses with excellent optical characteristics, small size, and adequate aberration correction. 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 meeting the design requirements of being ultra-thin and having a wide angle.

[0004] 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 negative refractive power, a second lens, a third lens having positive refractive power, and a fourth lens having negative refractive power;

[0005] The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, 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, and the axial distance from the image side of the first lens to the object side of the second lens is d2, and the following relationships are satisfied: -5.00≤f1 / f≤-2.00; 0.40≤f3 / f≤0.70; -1.20≤f4 / f≤-0.80; 2.50≤(R3+R4) / (R3-R4)≤20.00; 1.20≤d1 / d2≤3.50.

[0006] Preferably, the central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: 1.50≤R7 / R8≤6.00.

[0007] 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; 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 camera lens is TTL, and satisfies the following relationships: 1.78≤(R1+R2) / (R1-R2)≤7.50; 0.05≤d1 / TTL≤0.18.

[0008] Preferably, the camera optical lens satisfies the following relationship: 2.85≤(R1+R2) / (R1-R2)≤6.00; 0.08≤d1 / TTL≤0.15.

[0009] 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; the focal length of the second lens is f2, the on-axis thickness of the second lens is d3, and the total optical length of the camera lens is TTL, and satisfies the following relationships: -1181.57≤f2 / f≤8.46; 0.14≤d3 / TTL≤0.52.

[0010] Preferably, the camera optical lens satisfies the following relationships: -738.48≤f2 / f≤6.77; 0.23≤d3 / TTL≤0.42.

[0011] 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 convex at the paraxial position; the central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the camera lens is TTL, and satisfies the following relationships: 0.04≤(R5+R6) / (R5-R6)≤0.27; 0.05≤d5 / TTL≤0.35.

[0012] Preferably, the camera optical lens satisfies the following relationship: 0.07≤(R5+R6) / (R5-R6)≤0.22; 0.08≤d5 / TTL≤0.28.

[0013] 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, the axial thickness of the fourth lens is d7, and the total optical length of the camera lens is TTL, and satisfies the following relationships: 0.70≤(R7+R8) / (R7-R8)≤7.42; 0.01≤d7 / TTL≤0.20.

[0014] Preferably, the camera optical lens satisfies the following relationship: 1.12≤(R7+R8) / (R7-R8)≤5.93; 0.02≤d7 / TTL≤0.16.

[0015] Preferably, the image height of the camera optical lens is IH, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: TTL / IH≤2.32.

[0016] Preferably, the field of view (FOV) of the camera optical lens in the diagonal direction is FOV and satisfies the following relationship: FOV≥89.00°.

[0017] Preferably, the combined focal length of the first lens and the second lens is f12, and satisfies the following relationship: -6.74≤f12 / f≤-1.18.

[0018] Preferably, the aperture value of the camera optical lens is FNO, and satisfies the following relationship: FNO≤2.27.

[0019] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical characteristics, and has the characteristics of wide-angle and ultra-thin, 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

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown;

[0023] Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0024] Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0025] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0026] Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown;

[0027] Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0028] Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0029] Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0030] Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown;

[0031] Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0032] Figure 12 yes Figure 9 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0033] Figure 13 This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention;

[0034] Figure 14 yes Figure 13 A schematic diagram of axial aberrations of the camera optical lens shown;

[0035] Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0036] Figure 16 yes Figure 13 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0037] 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.

[0038] (First Implementation)

[0039] Referring to the accompanying drawings, the present invention provides a camera optical lens 10. Figure 1 The image shown is a camera optical lens 10 according to a first embodiment of the present invention. The camera optical lens 10 comprises four lenses. Specifically, the camera optical lens 10, from the object side to the image side, consists of: a first lens L1, an aperture S1, a second lens L2, a third lens L3, and a fourth lens L4. An optical element such as an optical filter GF may be disposed between the fourth lens L4 and the image plane S1.

[0040] 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 optional embodiments, the lenses may be made of other materials.

[0041] In this embodiment, the first lens L1 has negative 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.

[0042] In this embodiment, the focal length of the camera optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship: -5.00≤f1 / f≤-2.00. This specifies the ratio of the focal length f1 of the first lens L1 to the focal length f of the camera optical lens 10, which can effectively balance the spherical aberration and field curvature of the system.

[0043] 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: 0.40≤f3 / f≤0.70. This specifies the ratio of the focal length f3 of the third lens L3 to the focal length f of the camera optical lens 10. Through the reasonable allocation of focal lengths, the system has better imaging quality and lower sensitivity.

[0044] 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: -1.20≤f4 / f≤-0.80. This specifies the ratio of the focal length f4 of the fourth lens L4 to the focal length f of the camera optical lens 10. Through the reasonable allocation of focal lengths, the system has better imaging quality and lower sensitivity.

[0045] The central radius of curvature of the object side of the second lens L2 is defined as R3, and the central radius of curvature of the image side of the second lens L2 is defined as R4, satisfying the following relationship: 2.50≤(R3+R4) / (R3-R4)≤20.00. This defines the shape of the second lens L2. Within the range specified by the condition, the degree of refraction of light passing through the lens can be mitigated, effectively reducing aberrations.

[0046] The axial thickness of the first lens L1 is defined as d1, and the axial distance from the image side of the first lens L1 to the object side of the second lens L2 is defined as d2, satisfying the following relationship: 1.20≤d1 / d2≤3.50. This specifies the ratio of the axial thickness d1 of the first lens L1 to the axial distance d2 from the image side of the first lens L1 to the object side of the second lens L2. Within the range of the condition, this helps to compress the overall length of the optical system and achieve an ultra-thin effect.

[0047] The center radius of curvature of the object side of the fourth lens L4 is defined as R7, and the center radius of curvature of the image side of the fourth lens L4 is defined as R8, satisfying the following relationship: 1.50≤R7 / R8≤6.00, which specifies the shape of the fourth lens L4. Within this condition range, it is beneficial to correct aberrations at off-axis drawing angles.

[0048] In this embodiment, the object-side surface of the first lens L1 is convex near the axis, and the image-side surface is concave near the axis. In other optional embodiments, the object-side surface and image-side surface of the first lens L1 may also be configured with other concave and convex distributions.

[0049] The central radius of curvature of the object-side surface of the first lens L1 is defined as R1, and the central radius of curvature of the image-side surface of the first lens L1 is defined as R2, satisfying the following relationship: 1.78≤(R1+R2) / (R1-R2)≤7.50. By reasonably controlling the shape of the first lens L1, it is possible to effectively correct the spherical aberration of the system. Preferably, it satisfies 2.85≤(R1+R2) / (R1-R2)≤6.00.

[0050] 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: 0.05≤d1 / TTL≤0.18. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.08≤d1 / TTL≤0.15.

[0051] In this embodiment, the object-side surface of the second lens L2 is convex near the axis, and the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the second lens L2 may also be configured with other concave and convex distributions.

[0052] 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: -1181.57 ≤ f2 / f ≤ 8.46. By controlling the optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system. Preferably, -738.48 ≤ f2 / f ≤ 6.77 is satisfied.

[0053] 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: 0.14≤d3 / TTL≤0.52. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.23≤d3 / TTL≤0.42.

[0054] In this embodiment, the object-side surface of the third lens L3 is convex near the axis, and the image-side surface is also convex near the axis. In other optional embodiments, the object-side surface and image-side surface of the third lens L3 may also be configured with other concave and convex distributions.

[0055] The central radius of curvature of the object-side surface of the third lens L3 is defined as R5, and the central radius of curvature of the image-side surface of the third lens L3 is defined as R6, satisfying the following relationship: 0.04≤(R5+R6) / (R5-R6)≤0.27. This defines the shape of the third lens L3. Within the range specified by the condition, it can mitigate the degree of light refraction after passing through the lens and effectively reduce aberrations. Preferably, it satisfies 0.07≤(R5+R6) / (R5-R6)≤0.22.

[0056] 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: 0.05≤d5 / TTL≤0.35. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.08≤d5 / TTL≤0.28.

[0057] In this embodiment, the object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the fourth lens L4 may also be configured with other concave and convex distributions.

[0058] The center radius of curvature of the object-side surface of the fourth lens L4 is defined as R7, and the center radius of curvature of the image-side surface of the fourth lens L4 is defined as R8, satisfying the following relationship: 0.70≤(R7+R8) / (R7-R8)≤7.42. 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 and other problems in off-axis image angles. Preferably, it satisfies 1.12≤(R7+R8) / (R7-R8)≤5.93.

[0059] The fourth lens L4 has an on-axis thickness of d7, and the total optical length of the camera lens 10 is TTL, satisfying the following relationship: 0.01≤d7 / TTL≤0.20. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.02≤d7 / TTL≤0.16.

[0060] In this embodiment, the image height of the camera optical lens 10 is IH, the total optical length of the camera optical lens 10 is TTL, and the following relationship is satisfied: TTL / IH≤2.32, which is beneficial to achieving ultra-thinness.

[0061] In this embodiment, the field of view (FOV) of the camera optical lens 10 is greater than or equal to 89.00°, thereby achieving wide-angle viewing.

[0062] In this embodiment, the aperture value FNO of the camera optical lens 10 is less than or equal to 2.27, thereby achieving a large aperture and good imaging performance. Preferably, the aperture value FNO of the camera optical lens 10 is less than or equal to 2.22.

[0063] In this embodiment, the focal length of the imaging optical lens 10 is defined as f, and the combined focal length of the first lens L1 and the second lens L2 is f12, satisfying the following relationship: -6.74 ≤ f12 / f ≤ -1.18. This eliminates aberrations and distortions in the imaging optical lens 10 and reduces the back focal length of the imaging optical lens 10, maintaining the miniaturization of the image lens system. Preferably, -4.21 ≤ f12 / f ≤ -1.48.

[0064] The camera optical lens 10 has good optical performance while meeting the design requirements of wide-angle and ultra-thin design. Based on the characteristics of the 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 camera elements.

[0065] The camera optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, on-axis thickness, inversion point position, and stagnation point position are mm.

[0066] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane 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.

[0068] 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. Specific possible implementation schemes are described below.

[0069] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0070] Table 1

[0071]

[0072] The meanings of each symbol are as follows.

[0073] S1: Aperture;

[0074] R: Radius of curvature at the center of the optical surface;

[0075] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0076] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0077] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0078] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0079] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0080] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0081] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0082] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0083] R9: The center radius of curvature of the object side surface of the optical filter GF;

[0084] R10: Radius of curvature of the center of the image side of the optical filter GF;

[0085] d: Axial thickness of the lens, axial distance between lenses;

[0086] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0087] d1: On-axis thickness of the first lens L1;

[0088] 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;

[0089] d3: On-axis thickness of the second lens L2;

[0090] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0091] d5: On-axis thickness of the third lens L3;

[0092] 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;

[0093] d7: On-axis thickness of the fourth lens L4;

[0094] d8: The on-axis distance from the image side of the fourth lens L4 to the object side of the optical filter GF;

[0095] d9: On-axis thickness of the optical filter GF;

[0096] d10: The on-axis distance from the image-side surface of the optical filter GF to the image plane Si;

[0097] nd: Refractive index of the d-line (the d-line represents green light with a wavelength of 550 nm);

[0098] nd1: The refractive index of the d-line of the first lens L1;

[0099] nd2: The refractive index of the d-line of the second lens L2;

[0100] nd3: The refractive index of the d-line of the third lens L3;

[0101] nd4: The refractive index of the d-line of the fourth lens L4;

[0102] ndg: The refractive index of the d-line of the optical filter GF;

[0103] vd: Abbe number;

[0104] v1: Abbe number of the first lens L1;

[0105] v2: Abbe number of the second lens L2;

[0106] v3: Abbe number of the third lens L3;

[0107] v4: Abbe number of the fourth lens L4;

[0108] vg: Abbe number of the optical filter GF.

[0109] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0110] Table 2

[0111]

[0112]

[0113] 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).

[0114] z=(cr 2 ) / {1+[1-(k+1)(c 2 r2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1)

[0115] 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).

[0116] Tables 3 and 4 show the inversion point and stagnation point design data of each lens in the imaging optical lens 10 of the first embodiment of the present invention. P1R1 and P1R2 represent the object-side and image-side surfaces of the first lens L1, respectively; P2R1 and P2R2 represent the object-side and image-side surfaces of the second lens L2, respectively; P3R1 and P3R2 represent the object-side and image-side surfaces of the third lens L3, respectively; and P4R1 and P4R2 represent the object-side and image-side surfaces of the fourth lens L4, respectively. The data in the "Inversion Point Position" column corresponds to the vertical distance from the inversion point set on the surface of each lens to the optical axis of the imaging optical lens 10. The data in the "Stagnation Point Position" column corresponds to the vertical distance from the stagnation point set on the surface of each lens to the optical axis of the imaging optical lens 10.

[0117] Table 3

[0118] P1R1 0 / / P1R2 0 / / P2R1 1 0.485 / P2R2 2 0.275 0.995 P3R1 1 0.475 / P3R2 1 1.215 / P4R1 2 0.335 1.245 P4R2 2 0.455 1.965

[0119] Table 4

[0120] P1R1 0 / P1R2 0 / P2R1 0 / P2R2 1 0.445 P3R1 1 0.895 P3R2 0 / P4R1 1 0.505 P4R2 1 0.995

[0121] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm passes through the camera optical lens 10 of the first embodiment. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0122] Table 17, which appears later, shows the values ​​corresponding to the various numerical values ​​and parameters specified in the conditional expressions in each of the first, second, third, and fourth embodiments.

[0123] As shown in Table 17, the first embodiment satisfies all the conditional expressions.

[0124] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 0.904 mm, the full field of view image height IH is 2.214 mm, and the field of view FOV in the diagonal direction is 96.00°. The camera optical lens 10 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0125] (Second Implementation)

[0126] 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.

[0127] In this embodiment, the second lens L2 has positive refractive power.

[0128] Figure 5 The image shows the camera optical lens 20 according to the second embodiment of the present invention.

[0129] Tables 5 and 6 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0130] Table 5

[0131]

[0132] Table 6 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0133] Table 6

[0134]

[0135]

[0136] Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0137] Table 7

[0138] P1R1 1 0.965 / P1R2 1 0.575 / P2R1 0 / / P2R2 2 0.245 0.935 P3R1 2 0.575 1.135 P3R2 2 0.255 0.785 P4R1 2 0.375 1.285 P4R2 2 0.325 1.385

[0139] Table 8

[0140] P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 2 0.435 1.075 P3R1 2 0.885 1.215 P3R2 2 0.555 0.945 P4R1 1 0.795 / P4R2 1 0.875 /

[0141] Figure 6 , Figure 7The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm after passing through the camera optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0142] As shown in Table 17, the second embodiment satisfies all the conditional expressions.

[0143] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 1.025mm, the full field of view image height IH is 2.214mm, and the field of view FOV in the diagonal direction is 89.60°. The camera optical lens 20 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0144] (Third Implementation)

[0145] 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.

[0146] Figure 9 The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0147] Tables 9 and 10 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0148] Table 9

[0149]

[0150] Table 10 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0151] Table 10

[0152]

[0153] Tables 11 and 12 show the inflection point and stagnation point design data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0154] Table 11

[0155] P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 2 0.255 0.965 P3R1 2 0.565 1.255 P3R2 1 1.265 / P4R1 2 0.355 1.215 P4R2 2 0.445 1.815

[0156] Table 12

[0157]

[0158]

[0159] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm passes through the camera optical lens 30 of the third embodiment. Figure 12 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 30 of the third embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0160] Table 17 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.

[0161] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 0.836 mm, the full field of view image height IH is 2.214 mm, and the field of view FOV in the diagonal direction is 98.20°. The camera optical lens 30 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0162] (Fourth Implementation)

[0163] 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.

[0164] Figure 13 The image shown is the camera optical lens 40 according to the fourth embodiment of the present invention.

[0165] Tables 13 and 14 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0166] Table 13

[0167]

[0168]

[0169] Table 14 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0170] Table 14

[0171]

[0172] Tables 15 and 16 show the inflection point and stagnation point design data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0173] Table 15

[0174]

[0175]

[0176] Table 16

[0177] P1R1 0 / P1R2 0 / P2R1 0 / P2R2 1 0.435 P3R1 1 0.925 P3R2 0 / P4R1 1 0.625 P4R2 1 1.055

[0178] Figure 14 , Figure 15 The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm after passing through the camera optical lens 40 of the fourth embodiment. Figure 16 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 546nm passes through the camera optical lens 40 of the fourth embodiment. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0179] Table 17 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.

[0180] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 0.951mm, the full field of view image height IH is 2.214mm, and the field of view FOV in the diagonal direction is 94.80°. The camera optical lens 40 meets the design requirements of wide-angle and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0181] Table 17

[0182]

[0183]

[0184] 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 negative refractive power, a second lens, a third lens with positive refractive power, and a fourth lens with negative refractive power; 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 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 object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is convex at the paraxial position. 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 focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, 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, and the axial distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relationship is satisfied: -5.00≤f1 / f≤-2.00; 0.40≤f³ / f≤0.70; -1.20≤f4 / f≤-0.80; 2.50≤(R3+R4) / (R3-R4)≤20.00; 1.20≤d1 / d2≤3.

50.

2. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: 1.50≤R7 / R8≤6.

00.

3. The camera optical lens according to claim 1, characterized in that, 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, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: 1.78≤(R1+R2) / (R1-R2)≤7.50; 0.05≤d1 / TTL≤0.

18.

4. The camera optical lens according to claim 3, characterized in that, The camera optical lens satisfies the following relationship: 2.85≤(R1+R2) / (R1-R2)≤6.00; 0.08≤d1 / TTL≤0.

15.

5. The camera optical lens according to claim 1, characterized in that, The focal length of the second lens is f2, the on-axis thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: -1181.57≤f² / f≤8.46; 0.14≤d3 / TTL≤0.

52.

6. The camera optical lens according to claim 5, characterized in that, The camera optical lens satisfies the following relationship: -738.48≤f² / f≤6.77; 0.23≤d3 / TTL≤0.

42.

7. The camera optical lens according to claim 1, characterized in that, The central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.04≤(R5+R6) / (R5-R6)≤0.27; 0.05≤d5 / TTL≤0.

35.

8. The camera optical lens according to claim 7, characterized in that, The camera optical lens satisfies the following relationship: 0.07≤(R5+R6) / (R5-R6)≤0.22; 0.08≤d5 / TTL≤0.

28.

9. The camera optical lens according to claim 1, characterized in that, The fourth lens has a central radius of curvature of R7 on the object side and R8 on the image side. The fourth lens has an axial thickness of d7, and the total optical length of the imaging lens is TTL, satisfying the following relationship: 0.70≤(R7+R8) / (R7-R8)≤7.42; 0.01≤d7 / TTL≤0.

20.

10. The camera optical lens according to claim 9, characterized in that, The camera optical lens satisfies the following relationship: 1.12≤(R7+R8) / (R7-R8)≤5.93; 0.02≤d7 / TTL≤0.

16.

11. The camera optical lens according to claim 1, characterized in that, The image height of the camera optical lens is IH, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: TTL / IH≤2.

32.

12. The camera optical lens according to claim 1, characterized in that, The field of view (FOV) of the camera optical lens along its diagonal direction is defined as follows: FOV ≥ 89.00°.

13. 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: -6.74≤f12 / f≤-1.

18.

14. The camera optical lens according to claim 1, characterized in that, The aperture value of the camera optical lens is FNO, and it satisfies the following relationship: FNO≤2.27.

Images