A high-pixel optical imaging lens

Abstract

The present invention relates to a high-pixel optical imaging lens, which sequentially includes, from the object side to the image side: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a filter. The high-pixel optical imaging lens satisfies the relational expression: f2 > -14, where f2 is the focal length of the second lens. The high-pixel optical imaging lens of the present invention adopts a six-lens combination. Through reasonable refractive power matching, while ensuring that the optical imaging lens has better light converging ability, it also enables the optical imaging lens to have good imaging performance characteristics, ensuring that the optical imaging lens has high imaging quality.

Description

Technical Field

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

[0002] In recent years, with the increasing high-end of smart phones, existing ordinary photographic lenses mostly adopt a four-piece or five-piece structure. However, with the development of technology and the increasing diverse needs of users, when the pixel area of the photosensitive device is continuously shrinking and the system's requirements for imaging quality are continuously increasing, the existing ordinary photographic lenses can no longer meet the shooting requirements of mobile phones.

[0003] Therefore, there is an urgent need for a high-pixel optical imaging lens. Summary of the Invention

[0004] In order to solve at least one of the above technical problems, the present invention provides a high-pixel optical imaging lens with high imaging quality and large aperture characteristics.

[0005] A high-pixel optical imaging lens disclosed by the present invention sequentially includes, from the object side to the image side:

[0006] A first lens with positive refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis;

[0007] A second lens with negative refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis;

[0008] A third lens with negative refractive power, the object side is concave near the optical axis, and the image side is convex near the optical axis;

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

[0010] A fifth lens with positive refractive power, the object side is convex near the optical axis, and the image side is convex near the optical axis; and

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

[0012] Wherein the high-pixel optical imaging lens satisfies the following relationship:

[0013] f2 > -14; wherein, f2 is the focal length of the second lens.

[0014] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relationship:

[0015] 0 < CT3 / T34 < 14; where CT3 is the maximum thickness of the third lens on the optical axis, and T34 is the maximum distance between the third lens and the fourth lens on the optical axis.

[0016] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0017] 2.6 < f4 / f ≤ 4.2; and

[0018] -7 < f3 / f ≤ -3; where f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the imaging lens group.

[0019] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0020] 0.41 < EPD / ttl < 0.7; where EPD is the diameter of the aperture stop, and TTL is the distance from the object side surface of the first lens at the paraxial region to the image plane.

[0021] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0022] 0.09 < CT4 / TTL < 0.2; where CT4 is the maximum thickness of the fourth lens on the optical axis, and TTL is the distance from the object side surface of the first lens at the paraxial region to the image plane.

[0023] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0024] -1.6 < f1 / f6 < -1.2; where f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.

[0025] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0026] 1.8 < f / EPD < 2; where EPD is the diameter of the aperture stop, and f is the focal length of the imaging lens group.

[0027] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0028] 0.08 < (CT2 + CT3) / ImgH < 0.25; where CT2 is the maximum thickness of the second lens on the optical axis, CT3 is the maximum thickness of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens at the paraxial region to the image plane.

[0029] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expressions:

[0030] -0.6 < (R51 + R52) / (R51 - R52) < -0.3; where R51 is the curvature of the object side surface of the fifth lens, and R52 is the curvature of the image side surface of the fifth lens.

[0031] According to an embodiment of the present invention, the high-pixel optical imaging lens satisfies the following relational expression:

[0032] 0.2 < f3 / R32 < 0.4; where f3 is the focal length of the third lens, and R32 is the curvature of the image side surface of the third lens.

[0033] The high-pixel optical imaging lens of the present invention adopts a six-piece lens combination. Through reasonable refractive power matching, while ensuring that the optical imaging lens has better light converging ability, it also enables the optical imaging lens to have good imaging performance characteristics, ensuring that the optical imaging lens has high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the high-pixel optical imaging lens in Embodiment 1.

[0035] Figure 2 It is an astigmatism and distortion curve graph of the high-pixel optical imaging lens in Embodiment 1.

[0036] Figure 3 It is a spherical aberration curve graph of the high-pixel optical imaging lens in Embodiment 1.

[0037] Figure 4 It is a chromatic aberration curve graph of the high-pixel optical imaging lens in Embodiment 1.

[0038] Figure 5 It is a schematic structural diagram of the high-pixel optical imaging lens in Embodiment 2.

[0039] Figure 6 It is an astigmatism and distortion curve graph of the high-pixel optical imaging lens in Embodiment 2.

[0040] Figure 7 It is a spherical aberration curve graph of the high-pixel optical imaging lens in Embodiment 2.

[0041] Figure 8 It is a chromatic aberration curve graph of the high-pixel optical imaging lens in Embodiment 2.

[0042] Figure 9 It is a schematic structural diagram of the high-pixel optical imaging lens in Embodiment 3.

[0043] Figure 10 It is an astigmatism and distortion curve graph of the high-pixel optical imaging lens in Embodiment 3.

[0044] Figure 11It is the spherical aberration curve graph of the high-pixel optical imaging lens in Embodiment 3.

[0045] Figure 12 It is the chromatic aberration curve graph of the high-pixel optical imaging lens in Embodiment 3.

[0046] Figure 13 It is the structural schematic diagram of the high-pixel optical imaging lens in Embodiment 4.

[0047] Figure 14 It is the astigmatism and distortion curve graphs of the high-pixel optical imaging lens in Embodiment 4.

[0048] Figure 15 It is the spherical aberration curve graph of the high-pixel optical imaging lens in Embodiment 4.

[0049] Figure 16 It is the chromatic aberration curve graph of the high-pixel optical imaging lens in Embodiment 4.

[0050] Figure 17 It is the structural schematic diagram of the high-pixel optical imaging lens in Embodiment 5.

[0051] Figure 18 It is the astigmatism and distortion curve graphs of the high-pixel optical imaging lens in Embodiment 5.

[0052] Figure 19 It is the spherical aberration curve graph of the high-pixel optical imaging lens in Embodiment 5.

[0053] Figure 20 It is the chromatic aberration curve graph of the high-pixel optical imaging lens in Embodiment 5. Detailed implementation manners

[0054] The present invention will be further described below in conjunction with the detailed implementation manners. 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 detailed implementation manners of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions 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 detailed implementation manners in the present invention, all other detailed implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0055] 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.

[0056] When the object side of the lens described in the present invention is a convex surface, it means that for any point on the object side surface of the lens, when a tangent plane is made, 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 the image side is a convex surface, it means that for any point on the image side surface of the lens, when a tangent plane is made, 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 for any point on the object side or image side surface of the lens, when a tangent plane is made, there are parts of the surface on both the left and right sides of the tangent plane, then there are inflection points on the surface. The judgment of the convexity and concavity of the object side and image side near the optical axis still applies to the above.

[0057] In addition, the aspheric curve equations of each lens are expressed as follows:

[0058]

[0059] Among them, Z is the sagitta of the distance 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.

[0060] Please refer to Figure 1 as shown.

[0061] The high-pixel optical imaging lens of the present invention, from the object side to the image side in sequence, is: diaphragm 1, first lens 2, second lens 3, third lens 4, fourth lens 5, fifth lens 6, sixth lens 7, and filter 8. Each lens has an object side surface facing the object and an image side surface facing the image. The high-pixel optical imaging lens further includes an imaging surface 9 located on the image side.

[0062] Among them, the first lens 2 has a positive refractive power. The object side surface is convex near the optical axis, and the image side surface is concave near the optical axis; the second lens 3 has a negative refractive power. The object side surface is convex near the optical axis, and the image side surface is concave near the optical axis; the third lens 4 has a negative refractive power. The object side surface is concave near the optical axis, and the image side surface is convex near the optical axis; the fourth lens 5 has a positive refractive power. The object side surface is concave near the optical axis, and the image side surface is convex near the optical axis; the fifth lens 6 has a positive refractive power. The object side surface is convex near the optical axis, and the image side surface is convex near the optical axis; the sixth lens 7 has a negative refractive power. The object side surface is concave near the optical axis, and the image side surface is concave near the optical axis.

[0063] In the above structure, the first lens 2 has a positive refractive power configuration and its object side is convex near the optical axis, which can effectively balance the low-order aberrations during imaging; the second lens 3 has a negative refractive power, its object side is convex near the optical axis, and its image side is concave near the optical axis, which is beneficial to eliminating the aberrations generated by the first lens 2; the third lens 4 has a negative refractive power and the fourth lens 5 has a positive refractive power, and their cooperation can effectively correct the paraxial spherical aberration and reduce the astigmatism field curvature at the periphery at the same time; the fifth lens 6 has a positive refractive power and its image side is convex near the optical axis, which helps to move 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 system, and can correct the off-axis aberration to improve the peripheral imaging quality; the sixth lens 7 has a negative refractive power and its image side is concave near the optical axis, which helps to reduce the internal reflection stray light of the sixth lens 7 and thus improve the imaging quality. There is a spacing distance between any two adjacent lenses among the above six lenses, and the lenses are relatively fixed to each other and cannot move.

[0064] The high-pixel optical imaging lens satisfies the relation: f2 > -14. Here, f2 is the focal length of the second lens. By controlling f2 to satisfy the above relation, the high-pixel optical imaging lens can have better light converging ability, and at the same time can ensure the characteristics of good imaging level of the high-pixel optical imaging lens, and ensure that the optical imaging lens has higher imaging quality.

[0065] In this application, the object sides and image sides of the first lens 2, the second lens 3, the third lens 4, the fourth lens 5, the fifth lens 6 and the sixth lens 7 are all aspherical structures. By using the characteristics of the aspherical surface being light, thin and flat, the overall structure of the high-pixel optical imaging lens of the present invention is more light and thin, and the image is clearer compared with the spherical structure.

[0066] When the high-pixel optical imaging lens of the present invention images, light enters from the object side of the high-pixel optical imaging lens and sequentially passes through the aperture stop 1, the first lens 2, the second lens 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.

[0067] Furthermore, the high-pixel optical imaging lens satisfies the relation: 0 < CT3 / T34 < 14. Here, CT3 is the maximum thickness of the third lens 3 on the optical axis, and T34 is the maximum distance between the third lens 4 and the fourth lens 5 on the optical axis. By controlling the ratio of CT3 / T34 to satisfy the above relation, the assembly difficulty of the camera lens can be effectively reduced.

[0068] Furthermore, the high-pixel optical imaging lens satisfies the relational expressions: 2.6 < f4 / f ≤ 4.2 and -7 < f3 / f ≤ -3. Wherein, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the imaging lens group. By controlling the ratios of f4 / f and f3 / f to satisfy the above relational expressions respectively, it is possible to effectively avoid excessive optical powers of the third lens 4, the fourth lens 5, and the sixth lens 7, thereby effectively reducing the low sensitivity of the high-pixel optical imaging lens and improving the imaging quality. At the same time, the high-pixel optical imaging lens has a shorter optical length, facilitating the miniaturization of the overall high-pixel optical imaging lens.

[0069] Furthermore, the high-pixel optical imaging lens satisfies the relational expression: 0.41 < EPD / ttl < 0.7. Wherein, EPD is the diameter of the aperture stop, and TTL is the distance from the second side of the object of the first lens to the image plane at the paraxial region. By controlling the ratio of EPD / ttl to satisfy the above relational expression, it is possible to effectively reduce the overall chromatic aberration of the lens imaging and prevent the lens imaging from being purple-biased or red-biased.

[0070] Furthermore, the high-pixel optical imaging lens satisfies the relational expression: 0.09 < CT4 / TTL < 0.2. Wherein, CT4 is the maximum thickness of the fourth lens on the optical axis, and TTL is the distance from the second side of the object of the first lens to the image plane at the paraxial region. By controlling the ratio of CT4 / TTL to satisfy the above relational expression, the spacing between the lenses can be made more reasonable, thereby effectively reducing the overall total length of the high-pixel optical imaging lens, and further reducing the assembly difficulty of the high-pixel optical imaging lens, making the assembly process smoother and simpler.

[0071] Furthermore, the high-pixel optical imaging lens satisfies the relational expression: -1.6 < f1 / f6 < -1.2. Wherein, f1 is the focal length of the first lens 2, and f6 is the focal length of the sixth lens 7. By controlling the ratio of f1 / f6 to satisfy the above relational expression, it is possible to effectively avoid excessive optical powers of the first lens 2 and the sixth lens 7, further reducing the low sensitivity of the high-pixel optical imaging lens, and improving the imaging quality of the lens. At the same time, the high-pixel optical imaging lens has a shorter optical length.

[0072] Furthermore, the high-pixel optical imaging lens satisfies the relational expression: 1.8 < f / EPD < 2. Wherein, EPD is the diameter of the aperture stop, and f is the focal length of the imaging lens group. By controlling the ratio of f / EPD to satisfy the above relational expression, the imaging effect of the high-pixel optical imaging lens is effectively improved.

[0073] Further, the high - pixel optical imaging lens satisfies the relation: 0.08 < (CT2 + CT3) / ImgH < 0.25. Wherein, CT2 is the maximum thickness of the second lens on the optical axis, CT3 is the maximum thickness of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens at the paraxial region to the image plane. By controlling the value of (CT2 + CT3) / ImgH to satisfy the above relation, the high - pixel optical imaging lens is effectively featured with a small head, which is more conducive to the overall miniaturization design of the high - pixel optical imaging lens.

[0074] Further, the high - pixel optical imaging lens satisfies the relation: - 0.6 < (R51 + R52) / (R51 - R52) < - 0.3. Wherein, R51 is the curvature of the object side surface of the fifth lens, and R52 is the curvature of the image side surface of the fifth lens. By controlling the value of (R51 + R52) / (R51 - R52) to satisfy the above relation, the stray light generated by the fifth lens 6 can be effectively reduced, thereby improving the imaging quality of the high - pixel optical imaging lens.

[0075] Still further, the high - pixel optical imaging lens satisfies the relation: 0.2 < f3 / R32 < 0.4. Wherein, f3 is the focal length of the third lens, and R32 is the curvature of the image side surface of the third lens. By controlling the ratio of f3 / R32 to satisfy the above relation, the optical sensitivity of the third lens 4 is effectively reduced, making the high - pixel optical imaging lens have a better imaging effect.

[0076] The high - pixel optical imaging lens of the present invention will be described in detail with the following specific embodiments in conjunction with the accompanying drawings.

[0077] Embodiment 1

[0078] Please refer to Figures 1 to 4 As shown, the high - pixel optical imaging lens in Embodiment 1 satisfies Table 1 - 1, Table 1 - 2, and Table 1 - 3.

[0079] Table 1 - 1 shows the basic parameters of the high - pixel optical imaging lens in this embodiment:

[0080]

[0081] Table 1 - 2 shows the aspheric coefficients of each lens in this embodiment:

[0082]

[0083]

[0084] Table 1 - 3 shows the values of each conditional expression in this embodiment:

[0085]

[0086] Embodiment 2

[0087] Please refer to Figures 5 to 8 as shown, the high-pixel optical imaging lens in Embodiment 2 meets Table 2-1, Table 2-2, and Table 2-3.

[0088] Table 2-1 shows the basic parameters of the high-pixel optical imaging lens of this embodiment:

[0089]

[0090]

[0091] Table 2-2 shows the aspherical coefficients of each lens in this embodiment:

[0092]

[0093] Table 2-3 shows the values of each conditional expression in this embodiment:

[0094]

[0095] Embodiment 3

[0096] Please refer to Figures 9 to 12 as shown, the high-pixel optical imaging lens in Embodiment 3 meets Table 3-1, Table 3-2, and Table 3-3.

[0097] Table 3-1 shows the basic parameters of the high-pixel optical imaging lens of this embodiment:

[0098]

[0099] Table 3-2 shows the aspherical coefficients of each lens in this embodiment:

[0100]

[0101]

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

[0103]

[0104] Embodiment 4

[0105] Please refer to Figures 13 to 16 as shown, the high-pixel optical imaging lens in Embodiment 4 meets Table 4-1, Table 4-2, and Table 4-3.

[0106] Table 4-1 shows the basic parameters of the high-pixel optical imaging lens of this embodiment:

[0107]

[0108]

[0109] Table 4-2 shows the aspheric coefficients of each lens in this embodiment:

[0110]

[0111] Table 4-3 shows the values of each conditional expression in this embodiment:

[0112]

[0113] Example 5

[0114] Please refer to Figures 17 to 20 As shown, the high-pixel optical imaging lens in Example 5 satisfies Table 5-1, Table 5-2, and Table 5-3.

[0115] Table 5-1 shows the basic parameters of the high-pixel optical imaging lens in this embodiment:

[0116]

[0117] Table 5-2 shows the aspheric coefficients of each lens in this embodiment:

[0118]

[0119]

[0120] Table 5-3 shows the values of each conditional expression in this embodiment:

[0121]

[0122] To facilitate the comparison of the above five embodiments, the following table shows the summary of the values obtained by each expression under the corresponding conditions of each embodiment:

[0123]

[0124]

[0125] In summary, the high-pixel optical imaging lens of the present invention adopts a six-piece lens combination. Through reasonable refractive power matching, while ensuring that the optical imaging lens has better light converging ability, it also enables the optical imaging lens to have good imaging performance characteristics, ensuring that the optical imaging lens has high imaging quality.

[0126] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is 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. Therefore, it should not be construed as a limitation to the present invention.

[0127] 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 of" means two or more, unless otherwise specifically defined.

[0128] Although the description of the present invention is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, improvements and variations are included in the spirit and scope of the present invention.

Claims

1. A high-pixel optical imaging lens, characterized in that, From the object side to the image side, it successively includes: A first lens with positive refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis; A second lens with negative refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis; A third lens with negative refractive power, the object side is concave near the optical axis, and the image side is convex near the optical axis; A fourth lens with positive refractive power, the object side is concave near the optical axis, and the image side is convex near the optical axis; A fifth lens with positive refractive power, the object side is convex near the optical axis, and the image side is convex near the optical axis; and A sixth lens with negative refractive power, the object side is concave near the optical axis, and the image side is concave near the optical axis; Wherein the high - pixel optical imaging lens satisfies the following relational expressions: f2 > - 14; where f2 is the focal length of the second lens; 0.41 < EPD / TTL < 0.7; where EPD is the diameter of the aperture, and TTL is the distance from the object side of the first lens at the paraxial region to the image plane; -0.6 < (R51 + R52) / (R51 - R52) < -0.3; where R51 is the curvature of the object side of the fifth lens, and R52 is the curvature of the image side of the fifth lens.

2. The high-pixel optical imaging lens according to claim 1, wherein The high - pixel optical imaging lens satisfies the following relational expressions: 0 < CT3 / T34 < 14; where CT3 is the maximum thickness of the third lens on the optical axis, and T34 is the maximum distance between the third lens and the fourth lens on the optical axis.

3. The high-pixel optical imaging lens according to claim 1, wherein The high - pixel optical imaging lens satisfies the following relational expressions: 2.6 < f4 / f ≤ 4.2; and -7 < f3 / f ≤ -3; where f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the imaging lens group.

4. The high-pixel optical imaging lens according to claim 1, wherein The high - pixel optical imaging lens satisfies the following relational expressions: 0.09 < CT4 / TTL < 0.2; where CT4 is the maximum thickness of the fourth lens on the optical axis, and TTL is the distance from the object side of the first lens at the paraxial region to the image plane.

5. The high-pixel optical imaging lens according to claim 1, wherein The high - pixel optical imaging lens satisfies the following relational expressions: -1.6 < f1 / f6 < -1.2; where f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.

6. The high-pixel optical imaging lens according to claim 1, characterized in that The high - pixel optical imaging lens satisfies the following relational expressions: 1.8 < f / EPD < 2; where EPD is the diameter of the aperture, and f is the focal length of the imaging lens group.

7. The high-pixel optical imaging lens according to claim 1, characterized in that, The high - pixel optical imaging lens satisfies the following relational expressions: 0.08 < (CT2 + CT3) / ImgH < 0.25; where CT2 is the maximum thickness of the second lens on the optical axis, CT3 is the maximum thickness of the third lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel region of the imaging plane of the imaging lens group.

8. The high-pixel optical imaging lens according to claim 1, wherein The high - pixel optical imaging lens satisfies the following relational expressions: 0.2 < f3 / R32 < 0.4; where f3 is the focal length of the third lens, and R32 is the curvature of the image side of the third lens.

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