A six-piece wide-angle optical imaging lens

Abstract

The present invention relates to a six-piece wide-angle optical imaging lens, which sequentially includes a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, and a filter from the object side to the image side. The six-piece wide-angle optical imaging lens satisfies the following relational expressions: 1.2 ≤ ImgH / f ≤ 1.4 and 0.2 ≤ CT3 / ΣCT ≤ 0.35; where f is the focal length of the imaging lens group, ImgH is half of the length of the diagonal of the effective imaging area of the imaging lens group, CT3 is the thickness of the third lens on the optical axis, and ΣCT is the sum of the thicknesses of all lenses on the optical axis. Through the matching of different refractive powers, the imaging lens of the present invention enables the entire imaging lens to have better light converging ability, maintain good wide-angle characteristics, and effectively control the total length of the overall optical imaging system by controlling the uniformity of the sizes between the lenses, avoiding excessive lens volume and facilitating the miniaturization design of the imaging lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and particularly relates to a six-piece wide-angle optical imaging lens. Background Art

[0002] With the rapid development of electronic technology, mobile and portable electronic devices have been rapidly popularized, such as smart phones, tablet computers, dash cams, and action cameras, etc. This has simultaneously promoted the vigorous development of related technologies of camera modules applied to electronic devices. Moreover, the continuous upgrading trend of electronic products such as smart phones has also led to higher and higher requirements for lenses.

[0003] Existing camera lenses generally adopt a 4P to 5P lens structure. The refractive power configuration of the above-mentioned conventional camera lenses cannot meet the requirements of wide-angle imaging while taking into account miniaturization and high pixel count. Summary of the Invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a six-piece wide-angle optical imaging lens with a better imaging field of view and high imaging quality.

[0005] A six-piece wide-angle optical imaging lens disclosed by the present invention, from the object side to the image side in sequence is:

[0006] A first lens with negative refractive power;

[0007] A second lens with positive refractive power, the image side surface of which is convex near the optical axis;

[0008] A third lens with positive refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is convex near the optical axis;

[0009] A fourth lens with negative refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

[0010] A fifth lens with negative refractive power, the object side surface of which is concave near the optical axis, and the image side surface of which is convex near the optical axis; and

[0011] A sixth lens with negative refractive power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis;

[0012] The six-piece wide-angle optical imaging lens satisfies the following relational expressions:

[0013] 1.2 ≤ ImgH / f ≤ 1.4;

[0014] 0.2 ≤ CT3 / ΣCT ≤ 0.35;

[0015] Wherein, f is the focal length of the imaging lens group, ImgH is half of the length of the diagonal of the effective imaging area of the imaging lens group, CT3 is the thickness of the third lens on the optical axis, and ΣCT is the sum of the thicknesses of all lenses on the optical axis.

[0016] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0017] 4.5 ≤ f2 / f ≤ 15; wherein, f2 is the focal length of the second lens, and f is the focal length of the imaging lens group.

[0018] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0019] 3 ≤ |(L3R1 * L3R2) / (L6R1 * L6R2)| ≤ 10;

[0020] Wherein, L3R1 is the radius of curvature of the image side of the third lens, L3R2 is the radius of curvature of the object side of the third lens, L6R1 is the radius of curvature of the object side of the sixth lens, and L6R2 is the radius of curvature of the image side of the sixth lens.

[0021] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0022] BFL / f > 0.5;

[0023] Wherein, BFL is the distance from the image side of the sixth lens to the imaging plane of the lens group on the optical axis, and f is the focal length of the imaging lens group.

[0024] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0025] 1.7 ≤ (V3 + V4) / (V5 - V6) ≤ 2.5;

[0026] Wherein, V3 is the dispersion coefficient of the third lens, V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, and V6 is the dispersion coefficient of the sixth lens.

[0027] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0028] 100 ≤ FOV ≤ 130;

[0029] Wherein, FOV is the maximum field of view angle of the optical imaging lens.

[0030] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relationship:

[0031] Distortion ≤ 25%;

[0032] Among them, Distortion is the optical distortion value of the optical imaging lens at the maximum field of view.

[0033] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relational expression:

[0034] 1.85 ≤ FNO ≤ 2.4;

[0035] Among them, FNO is the relative aperture value of the imaging lens group.

[0036] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relational expression:

[0037] 1 ≤ |(ET1 + ET2) / (CT1 + CT2)| ≤ 1.5;

[0038] Among them, ET1 is the edge thickness of the first lens, ET2 is the edge thickness of the second lens, CT1 is the thickness of the second lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

[0039] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relational expression:

[0040] L4R1 / L4R2 ≤ 4;

[0041] Among them, L4R1 is the curvature radius of the side surface of the fourth lens, and L4R2 is the curvature radius of the object side surface of the fourth lens.

[0042] According to an embodiment of the present invention, the six-piece wide-angle optical imaging lens satisfies the following relational expression:

[0043] 0.5 ≤ (f4 + f6) / f1 ≤ 1.9;

[0044] Among them, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f6 is the focal length of the sixth lens.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows: The six-piece wide-angle optical imaging lens of the present invention adopts a six-piece structure. Through different refractive power combinations, the entire imaging lens has better light convergence ability, maintains good wide-angle characteristics, and by controlling the uniformity of the sizes between the lenses, the total length of the overall optical imaging system is effectively controlled, avoiding the lens volume from being too large, facilitating the miniaturization design of the imaging lens, and effectively reducing the assembly difficulty of the imaging lens. Description of the Drawings

[0046] Figure 1 It is a schematic structural diagram of the six-piece wide-angle optical imaging lens in Embodiment 1.

[0047] Figure 2 It is the astigmatism and distortion curve graphs of the six - element wide - angle optical imaging lens in Embodiment 1.

[0048] Figure 3 It is the vertical chromatic aberration curve graph of the six - element wide - angle optical imaging lens in Embodiment 1.

[0049] Figure 4 It is the structural schematic diagram of the six - element wide - angle optical imaging lens in Embodiment 2.

[0050] Figure 5 It is the astigmatism and distortion curve graphs of the six - element wide - angle optical imaging lens in Embodiment 2.

[0051] Figure 6 It is the vertical chromatic aberration curve graph of the six - element wide - angle optical imaging lens in Embodiment 2.

[0052] Figure 7 It is the structural schematic diagram of the six - element wide - angle optical imaging lens in Embodiment 3.

[0053] Figure 8 It is the astigmatism and distortion curve graphs of the six - element wide - angle optical imaging lens in Embodiment 3.

[0054] Figure 9 It is the vertical chromatic aberration curve graph of the six - element wide - angle optical imaging lens in Embodiment 3.

[0055] Figure 10 It is the structural schematic diagram of the six - element wide - angle optical imaging lens in Embodiment 4.

[0056] Figure 11 It is the astigmatism and distortion curve graphs of the six - element wide - angle optical imaging lens in Embodiment 4.

[0057] Figure 12 It is the vertical chromatic aberration curve graph of the six - element wide - angle optical imaging lens in Embodiment 4.

[0058] Figure 13 It is the structural schematic diagram of the six - element wide - angle optical imaging lens in Embodiment 5.

[0059] Figure 14 It is the astigmatism and distortion curve graphs of the six - element wide - angle optical imaging lens in Embodiment 5.

[0060] Figure 15 It is the vertical chromatic aberration curve graph of the six - element wide - angle optical imaging lens in Embodiment 5. Specific embodiments

[0061] The present invention will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to this patent. In order to better illustrate the specific embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0062] In the description of the present invention, the object side refers to the side of the lens facing the object to be photographed, and the surface of the lens facing the object to be photographed is the object side surface. The image side refers to the side of the lens facing the imaging surface, and the surface of the lens facing the imaging surface is the image side surface.

[0063] When it is said that the object side surface of the lens of the present invention is a convex surface, it means that when a tangent plane is made at any point on the object side surface of the lens, the surface is always on the right side of the tangent plane, and its radius of curvature is positive. Conversely, the object side surface is a concave surface, and its radius of curvature is negative. When it is said that the image side surface is a convex surface, it means that when a tangent plane is made at any point on the image side surface of the lens, the surface is always on the left side of the tangent plane, and its radius of curvature is negative. Conversely, the image side surface is a concave surface, and its radius of curvature is positive. If a tangent plane is made at any point on the object side surface or the image side surface of the lens, and there are parts of the surface on both the left and right sides of the tangent plane, then there are curve inflection points on this surface. The judgment of the convexity and concavity of the object side and the image side near the optical axis still applies to the above.

[0064] In addition, the aspheric curve equations of each lens are expressed as follows:

[0065]

[0066] Wherein, Z is the distance sagitta from the origin of the aspheric surface when the aspheric surface is at a position with a height of r along the optical axis direction, c is the paraxial curvature of the aspheric surface (the radius of curvature R = 1 / c, that is, the reciprocal of the curvature); k is the conic coefficient; Ai is the i-th order coefficient of the aspheric surface. The high-order coefficients applied in the present invention are A4, A6, A8, A10, A12, A14, A16, A18, A20.

[0067] Please refer to Figure 1 as shown.

[0068] The six-piece wide-angle optical imaging lens of the present invention, from the object side to the image side in sequence, is: the first lens 1, the second lens 2, the aperture 3, the third lens 4, the fourth lens 5, the fifth lens 6, the sixth lens 7, and the filter 8. Each lens has an object side surface facing the object side and an image side surface facing the image side. The wide-angle optical imaging lens further includes an imaging surface 9 located on the image side.

[0069] Among them, the first lens 1 has a negative refractive power, the object side is convex near the optical axis, and its image side is concave near the optical axis; the second lens 2 has a positive refractive power, the object side is convex near the optical axis, and its image side is convex near the optical axis; the third lens 4 has a positive refractive power, the object side is convex near the optical axis, and its image side is convex near the optical axis; the fourth lens 5 has a negative refractive power, the object side is convex near the optical axis, and its image side is concave near the optical axis; the fifth lens 6 has a negative refractive power, the object side is concave near the optical axis, and its image side is convex near the optical axis; the sixth lens 7 has a negative refractive power, the object side is convex near the optical axis, and its image side is concave near the optical axis; there is a spacing distance between any adjacent lenses among the above six lenses, and the lenses are relatively fixed to each other and cannot move.

[0070] In the above structure, the first lens 1 has a negative refractive power, so that the first lens 1 can effectively collect marginal rays, which is beneficial to reducing aberration and contributing to the realization of wide-angle imaging; the second lens 2 has a positive refractive power, and its image side is convex near the optical axis, so that the second lens 2 has better light converging characteristics, which is conducive to the second lens 2 collecting the light of the first lens 1 and contributing to balancing paraxial aberration; the third lens 4 has a positive refractive power, its object side is convex near the optical axis, and its image side is convex near the optical axis, which can effectively correct paraxial spherical aberration; the fourth lens 5 has a negative refractive power, its object side is convex near the optical axis, and its image side is concave near the optical axis, effectively balancing the higher-order aberration of the optical imaging system; the fifth lens 6 has a negative refractive power, its object side is concave near the optical axis, and its image side is convex near the optical axis, effectively improving the balancing effect on off-axis astigmatism; the sixth lens 7 has a negative refractive power, its object side is convex near the optical axis, and its image side is concave near the optical axis, effectively moving the principal point of the optical imaging system away from the image side end, thereby effectively shortening the overall length of the optical imaging system, being beneficial to the miniaturization of the overall lens, and at the same time can correct off-axis aberration to improve the peripheral imaging quality.

[0071] Among them, the six-piece wide-angle optical imaging lens satisfies the relational expressions: 1.2 ≤ ImgH / f ≤ 1.4 and 0.2 ≤ CT3 / ΣCT ≤ 0.35. Wherein, f is the focal length of the imaging lens group, that is, f is the overall total focal length of the imaging lens, ImgH is half of the length of the diagonal of the effective imaging area of the imaging lens group, CT3 is the thickness of the third lens on the optical axis, and ΣCT is the sum of the thicknesses of all lenses on the optical axis. By controlling the ratio of ImgH / f to satisfy the above relational expressions, the overall length of the overall optical imaging system is effectively controlled, avoiding the lens volume from being too large, thereby being beneficial to the miniaturization design of the imaging lens, effectively enabling the optical lens of the present invention to be better applied to electronic devices with a smaller volume. By controlling the ratio of CT3 / ΣCT to satisfy the above relational expressions, the uniformity of the sizes between the lenses is effectively controlled, and further the assembly difficulty of the imaging lens is effectively reduced.

[0072] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 4.5 ≤ f2 / f ≤ 15. Here, f2 is the focal length of the second lens 2, and f is the focal length of the imaging lens group. By controlling the f2 / f ratio to satisfy the above relation, the overall length of the lens is effectively reduced. At the same time, the refractive power of the second lens 2 can be ensured to be within a reasonable range, effectively improving the balance effect of paraxial aberration when light converges, thereby improving the imaging quality.

[0073] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 3 ≤ |(L3R1 * L3R2) / (L6R1 * L6R2)| ≤ 10. Here, L3R1 is the curvature radius of the image side of the third lens 4, L3R2 is the curvature radius of the object side of the third lens 4, L6R1 is the curvature radius of the object side of the sixth lens 7, and L6R2 is the curvature radius of the image side of the sixth lens 7. By controlling the ratio of (L3R1 * L3R2) / (L6R1 * L6R2) to satisfy the above relation, the curvature radii of the third lens 4 and the sixth lens 7 are effectively ensured to be within a reasonable range, which helps to eliminate higher-order aberrations and makes the shapes of the third lens 4 and the sixth lens 7 more uniform, thereby reducing the tolerance sensitivity of the lens.

[0074] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: BFL / f > 0.5. Here, BFL is the distance from the image side of the sixth lens to the imaging plane of the lens group on the optical axis, and f is the focal length of the imaging lens group. By controlling the BFL / f ratio to satisfy the above relation, the distance from the sixth lens 7 to the imaging plane is effectively controlled. In this way, it helps to reserve more design space for the later structural design.

[0075] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 1.7 ≤ V3 + V4 / V5 - V6 ≤ 2.5. Here, V3 is the dispersion coefficient of the third lens, V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, and V6 is the dispersion coefficient of the sixth lens. By controlling the ratio of V3 + V4 / V5 - V6, the rationality of the dispersion coefficient matching between the lenses is effectively improved, so that the six-piece wide-angle optical imaging lens as a whole has a better chromatic aberration balance effect.

[0076] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 100 ≤ FOV ≤ 130. Here, FOV is the maximum field of view angle of the optical imaging lens. By making FOV satisfy the above relation, the incident angle of the six-piece wide-angle optical imaging lens is effectively controlled, making the lens have a better wide-angle effect.

[0077] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: Distortion ≤ 25%. Here, Distortion is the optical distortion value of the optical imaging lens at the maximum field of view. By making the value of Distortion satisfy the above relation, the distortion value of the overall optical imaging system is restricted, the deformation amount of the captured image is effectively guaranteed, and thus the forming quality is improved.

[0078] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 1.85 ≤ FNO ≤ 2.4. Here, FNO is the relative aperture value of the imaging lens group. By making the value of FNO conform to the above relation, the six-piece wide-angle optical imaging lens has a reasonable aperture value, thus ensuring that the optical imaging lens has a high imaging quality and at the same time increasing the light input amount of the overall optical imaging system.

[0079] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 1 ≤ |(ET1 + ET2) / (CT1 + CT2)| ≤ 1.5. Here, ET1 is the edge thickness of the first lens 1, ET2 is the edge thickness of the second lens 2, CT1 is the thickness of the second lens 2 on the optical axis, and CT2 is the thickness of the second lens 2 on the optical axis. Controlling the ratio of (ET1 + ET2) / (CT1 + CT2) to conform to the above relation helps to control the ratio of the central thickness and the edge thickness of the first lens 1 and the second lens 2, thereby ensuring the uniformity of their shapes, effectively controlling the manufacturing tolerance of the lens, and improving the production quality of the product.

[0080] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: L4R1 / L4R2 ≤ 4. Here, L4R1 is the side curvature radius of the fourth lens 5, and L4R2 is the object-side curvature radius of the fourth lens 5. By controlling the ratio of L4R1 / L4R2 to satisfy the above relation, the balance effect of the aberration of the overall optical imaging system is effectively improved, the shape of the fourth lens 5 becomes more uniform, and thus the tolerance sensitivity of the fourth lens 5 is effectively reduced.

[0081] Furthermore, the six-piece wide-angle optical imaging lens satisfies the relation: 0.5 ≤ (f4 + f6) / f1 ≤ 1.9. Here, f1 is the focal length of the first lens 1, f4 is the focal length of the fourth lens 5, and f6 is the focal length of the sixth lens 7. By controlling the ratio of (f4 + f6) / f1 to conform to the above relation, the refractive power balance degree of the overall optical imaging system is effectively improved, thereby effectively reducing off-axis astigmatism and further improving the imaging quality.

[0082] When the six-piece wide-angle optical imaging lens of the present invention forms an image, light enters from the object side of the six-piece wide-angle optical imaging lens and sequentially passes through the first lens 1, the second lens 2, the aperture 3, the third lens 4, the fourth lens 5, the fifth lens 6, the sixth lens 7, and the filter 8 and then forms an image on the imaging surface 9.

[0083] In this application, the object side and the image side of the first lens 1, the second lens 2, the third lens 4, the fourth lens 5, the fifth lens 6, and the sixth lens 7 are both aspherical surfaces. By utilizing the characteristics of the aspherical surface being light, thin, and flat, the overall structure of the six-piece wide-angle optical imaging lens of the present invention is thinner and lighter, and the image is clearer compared to the spherical surface structure.

[0084] The six-piece wide-angle optical imaging lens of the present invention will be described in detail through the following specific embodiments in conjunction with the accompanying drawings.

[0085] Embodiment 1

[0086] Please refer to Figures 1 to 3 As shown, the six-piece wide-angle optical imaging lens in Embodiment 1 satisfies Table 1-1, Table 1-2, and Table 1-3.

[0087] Table 1-1 shows the basic parameters of the six-piece wide-angle optical imaging lens of this embodiment:

[0088]

[0089]

[0090] Table 1-2 shows the aspherical coefficients of each lens in this embodiment:

[0091]

[0092] Table 1-3 shows the values of each conditional expression in this embodiment:

[0093]

[0094]

[0095] Embodiment 2

[0096] Please refer to Figures 4 to 6 As shown, the six-piece wide-angle optical imaging lens in Embodiment 2 satisfies Table 2-1, Table 2-2, and Table 2-3.

[0097] Table 2-1 shows the basic parameters of the six-piece wide-angle optical imaging lens of this embodiment:

[0098]

[0099] Table 2-2 shows the aspherical coefficients of each lens in this embodiment:

[0100]

[0101]

[0102] Table 2-3 shows the values of each conditional expression in this embodiment:

[0103]

[0104] Example 3

[0105] Please refer to Figures 7 to 9 As shown, the six-piece wide-angle optical imaging lens in Example 3 meets Tables 3-1, 3-2, and 3-3.

[0106] Table 3-1 shows the basic parameters of the six-piece wide-angle optical imaging lens in this embodiment:

[0107]

[0108]

[0109] Table 3-2 shows the aspherical coefficients of each lens in this embodiment:

[0110]

[0111] Table 3-3 shows the values of each conditional expression in this embodiment:

[0112]

[0113]

[0114] Example 4

[0115] Please refer to Figures 10 to 12 As shown, the six-piece wide-angle optical imaging lens in Example 4 meets Tables 4-1, 4-2, and 4-3.

[0116] Table 4-1 shows the basic parameters of the six-piece wide-angle optical imaging lens in this embodiment:

[0117]

[0118] Table 4-2 shows the aspherical coefficients of each lens in this embodiment:

[0119]

[0120]

[0121] Table 4-3 shows the values of each conditional expression in this embodiment:

[0122]

[0123] Example 5

[0124] Please refer to Figures 13 to 15As shown, the six-piece wide-angle optical imaging lens in Embodiment 5 meets Table 5-1, Table 5-2, and Table 5-3.

[0125] Table 5-1 shows the basic parameters of the six-piece wide-angle optical imaging lens of this embodiment:

[0126]

[0127]

[0128] Table 5-2 shows the aspherical coefficients of each lens in this embodiment:

[0129]

[0130] Table 5-3 shows the values of each conditional expression in this embodiment:

[0131]

[0132]

[0133] To facilitate the comparison of the above five embodiments, the following table summarizes the values obtained by each expression under the corresponding conditions of each embodiment:

[0134]

[0135] In summary, the six-piece wide-angle optical imaging lens of the present invention adopts a six-piece structure. Through different refractive power combinations, the entire imaging lens has better light converging ability, maintains good wide-angle characteristics, and by controlling the uniformity of the sizes between the lenses, effectively controls the total length of the overall optical imaging system, avoids the lens volume from being too large, facilitates the miniaturization design of the imaging lens, and effectively reduces the assembly difficulty of the imaging lens.

[0136] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0137] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0138] Although the description of the present invention is made in connection with the above specific embodiments, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made in light of the above disclosure. Accordingly, all such alternatives, improvements, and variations are intended to be included within the spirit and scope of the present invention.

Claims

1. A six-piece wide-angle optical imaging lens, characterized in that, From the object side to the image side, in sequence: A first lens with negative refractive power; A second lens with positive refractive power, whose image side is convex near the optical axis; A third lens with positive refractive power, whose object side is convex near the optical axis and whose image side is convex near the optical axis; A fourth lens with negative refractive power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fifth lens with negative refractive power, whose object side is concave near the optical axis and whose image side is convex near the optical axis; And A sixth lens with negative refractive power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; The six-piece wide-angle optical imaging lens satisfies the following relationships: 1.2 ≤ ImgH / f ≤ 1.4; 0.2 ≤ CT3 / ΣCT ≤ 0.35; 4.5 ≤ f2 / f ≤ 15; 3 ≤ |(L3R1*L3R2) / (L6R1*L6R2)| ≤ 8.815; where f is the focal length of the imaging lens group, ImgH is half of the length of the diagonal of the effective imaging area of the imaging lens group, CT3 is the thickness of the third lens on the optical axis, ΣCT is the sum of the thicknesses of all lenses on the optical axis, f2 is the focal length of the second lens, f is the focal length of the imaging lens group, L3R1 is the curvature radius of the image side of the third lens, L3R2 is the curvature radius of the object side of the third lens, L6R1 is the curvature radius of the object side of the sixth lens, and L6R2 is the curvature radius of the image side of the sixth lens.

2. The six-piece wide-angle optical imaging lens according to claim 1, characterized in that The six-piece wide-angle optical imaging lens satisfies the following relationships: 0.556 > BFL / f > 0.5; where BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane of the lens group, and f is the focal length of the imaging lens group.

3. The six-piece wide-angle optical imaging lens according to claim 1, wherein The six-piece wide-angle optical imaging lens satisfies the following relationships: 1.7 ≤ V3 + V4 / V5 - V6 ≤ 2.5; where V3 is the dispersion coefficient of the third lens, V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, and V6 is the dispersion coefficient of the sixth lens.

4. The six-piece wide-angle optical imaging lens according to claim 1, wherein The six-piece wide-angle optical imaging lens satisfies the following relationships: 100 ≤ FOV ≤ 130; where FOV is the maximum field of view angle of the optical imaging lens.

5. The six-piece wide-angle optical imaging lens according to claim 1, wherein The six-piece wide-angle optical imaging lens satisfies the following relationships: Distortion ≤ 25%; where Distortion is the optical distortion value of the optical imaging lens at the maximum field of view.

6. The six-piece wide-angle optical imaging lens according to claim 1, wherein, The six-piece wide-angle optical imaging lens satisfies the following relationships: 1 ≤ |(ET1 + ET2) / (CT1 + CT2)| ≤ 1.5; where ET1 is the edge thickness of the first lens, ET2 is the edge thickness of the second lens, CT1 is the thickness of the second lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

7. The six-piece wide-angle optical imaging lens according to claim 1, wherein, The six-piece wide-angle optical imaging lens satisfies the following relationships: 1.887 ≤ L4R1 / L4R2 ≤ 4; where L4R1 is the curvature radius of the side of the fourth lens, and L4R2 is the curvature radius of the object side of the fourth lens.

8. The six-piece wide-angle optical imaging lens according to claim 1, wherein, The six-piece wide-angle optical imaging lens satisfies the following relationships: 0.5 ≤ (f4 + f6) / f1 ≤ 1.9; Among them, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f6 is the focal length of the sixth lens.

Images