Optical imaging lens

Abstract

The utility model relates to the field of optical lenses, in particular to an optical imaging lens, which sequentially comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with negative refractive power from an object side to an image side along an optical axis, a second lens having a negative refractive power; the object side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; the relational expression of TTL / Imghlt is met; 1.52, 1.52; tan (HFOV) > = 1; tTL is the distance from the object side surface of the first lens to the imaging surface of the lens on the optical axis, Imgh is half of the length of a diagonal line of an effective pixel area of the lens, and HFOV is half of the maximum field angle of the lens. By adopting the lens composed of six lenses and designing the parameters of each lens, the lens has a compact structure and keeps a larger image surface area, and the imaging quality is good.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to an optical imaging lens. Background Art

[0002] With the development of society and the advancement of technology, more and more smart products have entered people's lives. With the gradual popularization of smart terminals, people's love for photography has become increasingly high. Camera lenses have become standard equipment for electronic devices, and have even become the primary consideration for consumers when purchasing electronic devices.

[0003] With the continuous upgrading of smart products, consumers have higher and higher requirements for the shooting functions of mobile phones. Wide-angle, thin and light, and high-pixel have become the main development trends of mobile phone lenses. Since wide-angle lenses have large distortion, the image is obviously deformed and stretched, resulting in an unbalanced image ratio. Distortion needs to be corrected with the help of post-production software algorithms. Therefore, how to better achieve the balance of wide viewing angle, small distortion, and miniaturization of optical lenses has become an urgent problem to be solved. Utility Model Content

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an optical imaging lens, which adopts a lens composed of six lenses and designs the parameters of each lens, so that the lens has a compact structure while maintaining a large image area and has good imaging quality.

[0005] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0006] An optical imaging lens, which is composed of the following components from the object side to the image side along the optical axis:

[0007] A first lens having positive refractive power, wherein the image-side surface of the first lens comprises at least one inflection point;

[0008] a second lens having negative refractive power;

[0009] a third lens having positive refractive power, wherein the object side surface of the third lens is a convex surface;

[0010] a fourth lens having negative refractive power, wherein the image side surface of the fourth lens is a convex surface;

[0011] a fifth lens having positive refractive power;

[0012] a sixth lens having negative refractive power;

[0013] The lens satisfies the following relationship:

[0014] TTL / Imgh<1.52

[0015] tan(HFOV)≥1

[0016] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, Imgh is half of the diagonal length of the effective pixel area of ​​the lens, and HFOV is half of the maximum field of view of the lens.

[0017] The image side surface of the first lens includes at least one inflection point, which is beneficial to the uniform distribution of light on the first lens, ensuring the central brightness of the edge of the image surface, and also beneficial to further compressing the total optical length.

[0018] By limiting the ratio of TTL to Imgh, the lens module can be miniaturized while still having a large image surface, making it suitable for portable electronic devices that have strict requirements on thickness.

[0019] By limiting the tangent value of HFOV, the full field of view of the lens can be controlled, and the field of view of the imaging lens can be reasonably constrained, ensuring a wide shooting range while maintaining a large image area, which is beneficial to improving imaging quality.

[0020] Furthermore, the lens satisfies the following relationship:

[0021] 0% <OPD<1%

[0022] Among them, OPD is the maximum value of optical distortion of the optical imaging lens.

[0023] By satisfying the above relationship, the deformation and distortion formed at the edge of the picture are reduced, making the lens have the characteristics of small distortion, improving the imaging quality, and facilitating the correction of the later software algorithm.

[0024] Furthermore, the lens satisfies the following relationship:

[0025] -0.7 <f3 / f4<-0.5

[0026] Among them, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

[0027] By satisfying the above conditions, the optical power of the lens is reasonably distributed, which is beneficial to improving the imaging quality of the system.

[0028] Furthermore, the lens satisfies the following relationship:

[0029] 1.1 <R1 / R2<1.3

[0030] 2 <R8 / R7<2.6

[0031] Among them, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens; R8 is the curvature radius of the image side surface of the fourth lens, and R7 is the curvature radius of the object side surface of the fourth lens.

[0032] By satisfying the above relationship, it can be ensured that the ratio of the curvature radius of the object side surface and the image side surface of the first lens and the fourth lens is within a certain range, which not only ensures that the first lens and the fourth lens provide sufficient refractive power, but also meets the requirements of small aperture and is conducive to later processing and molding.

[0033] Furthermore, the lens satisfies the following relationship:

[0034] 0.35<(CT3+CT4) / ΣCT<0.45

[0035] Wherein, CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and ΣCT is the total thickness of the lenses contained in the lens on the optical axis.

[0036] By satisfying the above relationship, the total thickness of the lens is reduced, the position and thickness of the lens are reasonably controlled, and the space application efficiency of the lens is improved.

[0037] Furthermore, the lens satisfies the following relationship:

[0038] 1.4<(CT4+CT5) / (T34+T45)<1.9

[0039] Among them, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T34 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and T45 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis.

[0040] By satisfying the above relationship and effectively controlling the thickness ratio of the lens group, the imaging quality can be improved, and the excessive sensitivity of the lens due to excessively thin thickness can be avoided, which is beneficial to the processing and molding of the lens group.

[0041] Furthermore, the lens satisfies the following relationship:

[0042] (V3+V5) / (V1+V2)>2.3

[0043] Wherein, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0044] By satisfying the above relationship and adopting a reasonable refractive index combination, the chromatic aberration and distortion of the lens can be effectively balanced to meet the requirement of small distortion of the lens.

[0045] Furthermore, the lens satisfies the following relationship:

[0046] 2.8 <SAG51 / SAG61<3.5

[0047] Among them, SAG51 is the on-axis distance between the effective radius vertices of the object side of the fifth lens, and SAG61 is the on-axis distance between the effective radius vertices of the object side of the sixth lens.

[0048] By satisfying the above relationship, it is helpful to better modify the field curvature and spherical aberration, provide sufficient refractive power, and also slow down the shape change of the fifth lens and the sixth lens, thereby reducing the difficulty of processing.

[0049] Furthermore, the lens satisfies the following relationship:

[0050] Imgh / Fno>1.35

[0051] Among them, Imgh is half of the diagonal length of the effective pixel area, and Fno is the aperture number of the lens.

[0052] By satisfying the above relationship, the aperture size of the optical system can be guaranteed, the imaging quality of the image-side photosensitive chip can be improved, and the influence of dark current on imaging can be reduced.

[0053] The beneficial effects of the utility model are:

[0054] The utility model provides an optical imaging lens, which is suitable for portable electronic products. By reasonably controlling the positive and negative distribution of the focal length and the thickness ratio of each lens in the lens, the lens has a relatively compact structure while maintaining a larger image area. In addition, the imaging lens can meet the requirements of a large field of view and small distortion, and has good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0056] Figure 2 This is an on-axis astigmatism curve diagram of Example 1 of the utility model;

[0057] Figure 3 This is a distortion curve diagram of Example 1 of the utility model;

[0058] Figure 4 It is a modulation transfer function curve diagram of Example 1 of the utility model;

[0059] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0060] Figure 6 This is an on-axis astigmatism curve diagram of Example 2 of the utility model;

[0061] Figure 7 This is a distortion curve diagram of Example 2 of the utility model;

[0062] Figure 8 It is a modulation transfer function curve diagram of Example 2 of the utility model;

[0063] Fig. 9 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0064] Fig.10 This is an on-axis astigmatism curve diagram of Example 3 of the utility model;

[0065] Fig.11 This is a distortion curve diagram of Example 3 of the utility model;

[0066] Fig.12 is a modulation transfer function curve diagram of Example 3 of the utility model;

[0067] Fig.13 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0068] Fig.14 This is an on-axis astigmatism curve diagram of Example 4 of the utility model;

[0069] Fig.15 This is a distortion curve diagram of Example 4 of the utility model;

[0070] Fig.16 This is a modulation transfer function curve diagram of Example 4 of the utility model.

[0071] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, aperture; 8, filter. DETAILED DESCRIPTION

[0072] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0073] An optical imaging lens provided in an embodiment of the utility model is composed of the following components in sequence from the object side to the image side along the optical axis:

[0074] A first lens 1 having positive refractive power, wherein the image side surface of the first lens 1 comprises at least one inflection point;

[0075] A second lens 2 having negative refractive power;

[0076] a third lens 3 having positive refractive power, wherein the object side surface of the third lens 3 is a convex surface;

[0077] a fourth lens element 4 having negative refractive power, wherein the image side surface of the fourth lens element 4 is a convex surface;

[0078] a fifth lens 5 having positive refractive power;

[0079] a sixth lens 6 having negative refractive power;

[0080] The lens satisfies the following relationship:

[0081] TTL / Imgh<1.52

[0082] tan(HFOV)≥1

[0083] Wherein, TTL is the distance from the object side of the first lens 1 to the imaging surface of the lens on the optical axis, Imgh is half of the diagonal length of the effective pixel area of ​​the lens, and HFOV is half of the maximum field of view angle of the lens.

[0084] The image side surface of the first lens 1 includes at least one inflection point, which is beneficial to the uniform distribution of light on the first lens 1, ensuring the central brightness of the edge of the image surface, and also beneficial to the specific compression of the total optical length.

[0085] By limiting the ratio of TTL to Imgh, the lens module can be miniaturized while still having a large image surface, making it suitable for portable electronic devices that have strict requirements on thickness.

[0086] By limiting the tangent value of HFOV, the full field of view of the lens can be controlled, and the field of view of the imaging lens can be reasonably constrained, ensuring a wide shooting range while maintaining a large image area, which is beneficial to improving imaging quality.

[0087] Specifically, the lens satisfies the following relationship:

[0088] 0% <OPD<1%

[0089] Among them, OPD is the maximum value of optical distortion of the optical imaging lens.

[0090] By satisfying the above relationship, the deformation and distortion formed at the edge of the picture are reduced, making the lens have the characteristics of small distortion, improving the imaging quality, and facilitating the correction of the later software algorithm.

[0091] Specifically, the lens satisfies the following relationship:

[0092] -0.7 <f3 / f4<-0.5

[0093] Wherein, f3 is the focal length of the third lens 3 , and f4 is the focal length of the fourth lens 4 .

[0094] By satisfying the above conditions, the optical power of the lens is reasonably distributed, which is beneficial to improving the imaging quality of the system.

[0095] Specifically, the lens satisfies the following relationship:

[0096] 1.1 <R1 / R2<1.3

[0097] 2 <R8 / R7<2.6

[0098] Among them, R1 is the curvature radius of the object side surface of the first lens 1, R2 is the curvature radius of the image side surface of the first lens 1; R8 is the curvature radius of the image side surface of the fourth lens 4, and R7 is the curvature radius of the object side surface of the fourth lens 4.

[0099] By satisfying the above relationship, it can be ensured that the ratio of the curvature radius of the object side surface and the image side surface of the first lens 1 and the fourth lens 4 is within a certain range, which not only ensures that the first lens 1 and the fourth lens 4 provide sufficient refractive power, but also meets the requirements of small aperture and is conducive to later processing and molding.

[0100] Specifically, the lens satisfies the following relationship:

[0101] 0.35<(CT3+CT4) / ΣCT<0.45

[0102] Wherein, CT3 is the center thickness of the third lens 3 on the optical axis, CT4 is the center thickness of the fourth lens 4 on the optical axis, and ΣCT is the total thickness of the lenses contained in the lens on the optical axis.

[0103] By satisfying the above relationship, the total thickness of the lens is reduced, the position and thickness of the lens are reasonably controlled, and the space application efficiency of the lens is improved.

[0104] Specifically, the lens satisfies the following relationship:

[0105] 1.4<(CT4+CT5) / (T34+T45)<1.9

[0106] Among them, CT4 is the center thickness of the fourth lens 4 on the optical axis, CT5 is the center thickness of the fifth lens 5 on the optical axis, T34 is the distance from the image side of the third lens 3 to the object side of the fourth lens 4 on the optical axis, and T45 is the distance from the image side of the fourth lens 4 to the object side of the fifth lens 5 on the optical axis.

[0107] By satisfying the above relationship and effectively controlling the thickness ratio of the lens group, the imaging quality can be improved, and the excessive sensitivity of the lens due to excessively thin thickness can be avoided, which is beneficial to the processing and molding of the lens group.

[0108] Specifically, the lens satisfies the following relationship:

[0109] (V3+V5) / (V1+V2)>2.3

[0110] Wherein, V3 is the Abbe number of the third lens 3 , V5 is the Abbe number of the fifth lens 5 , V1 is the Abbe number of the first lens 1 , and V2 is the Abbe number of the second lens 2 .

[0111] By satisfying the above relationship and adopting a reasonable refractive index combination, the chromatic aberration and distortion of the lens can be effectively balanced to meet the requirement of small distortion of the lens.

[0112] Specifically, the lens satisfies the following relationship:

[0113] 2.8 <SAG51 / SAG61<3.5

[0114] Among them, SAG51 is the on-axis distance between the effective radius vertices of the object side of the fifth lens 5, and SAG61 is the on-axis distance between the effective radius vertices of the object side of the sixth lens 6.

[0115] By satisfying the above relationship, it is helpful to better modify the field curvature and spherical aberration, provide sufficient refractive power, and also slow down the shape change of the fifth lens 5 and the sixth lens 6, thereby reducing the difficulty of processing.

[0116] Specifically, the lens satisfies the following relationship:

[0117] Imgh / Fno>1.35

[0118] Among them, Imgh is half of the diagonal length of the effective pixel area, and Fno is the aperture number of the lens.

[0119] By satisfying the above relationship, the aperture size of the optical system can be guaranteed, the imaging quality of the image-side photosensitive chip can be improved, and the influence of dark current on imaging can be reduced.

[0120] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0121] Example 1

[0122] The present embodiment provides an optical imaging lens, which is composed of a first lens 1, a second lens 2, an aperture 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a filter 8 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The second lens 2 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The third lens 3 has a positive refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a convex surface. The fourth lens 4 has a negative refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The fifth lens 5 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The sixth lens 6 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The filter 8 is arranged between the sixth lens 6 and the image plane.

[0123] Table 1 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 1. The units of the radius of curvature and thickness are both millimeters (mm).

[0124] Table 1 is a table of lens parameters of Example 1

[0125]

[0126]

[0127] In this embodiment, the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric surface formula:

[0128]

[0129] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; A i The following table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35 10 , A 12 , A 14 , A 16 , A 18 , A 20 .

[0130] Table 2 below shows the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 1.

[0131] Table 2 is a table of high-order coefficients of various aspherical mirror surfaces in Example 1

[0132]

[0133]

[0134] Table 3 below shows important parameters in Example 1.

[0135] Table 3 is a table of important parameters of Example 1.

[0136]

[0137] The specific lens structure of this embodiment is as follows Figure 1 As shown in Table 1-3 and Figure 1 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the current embodiment is an optical imaging lens that can achieve a wide angle and miniaturization.

[0138] Figure 2 The on-axis astigmatism curve of this embodiment is shown. The maximum difference between the astigmatism S line and T line of the lens is about 0.03 mm, indicating that the lens has a good ability to improve astigmatism.

[0139] Figure 3 The distortion curve of this embodiment is shown. The maximum distortion of the lens is less than 1%, indicating that the lens has a good ability to improve distortion.

[0140] Figure 4 The modulation transfer function curve of this embodiment is shown. When the lens is at infinite object distance, the modulation transfer function (MTF) of the test frequency (110lp / mm) is greater than 0.5 at both on-axis and off-axis points, indicating that the lens has good performance.

[0141] Therefore, the optical imaging lens of this embodiment has the characteristics of miniaturization, wide viewing angle, small distortion, and large image surface.

[0142] Example 2

[0143] The present embodiment provides an optical imaging lens, which is composed of a first lens 1, a second lens 2, an aperture 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a filter 8 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The second lens 2 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The third lens 3 has a positive refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a convex surface. The fourth lens 4 has a negative refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The fifth lens 5 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The sixth lens 6 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The filter 8 is arranged between the sixth lens 6 and the image plane.

[0144] Table 4 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 2. The units of the radius of curvature and thickness are both millimeters (mm).

[0145] Table 4 is a table of lens parameters of Example 2

[0146]

[0147]

[0148] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 5 below shows the high-order coefficients of each aspheric mirror surface that can be used in embodiment 2.

[0149] Table 5 is a table of high-order coefficients of various aspherical mirror surfaces in Example 2

[0150] Surface serial number 1 2 3 4 6 7 k -2.04E+01 -1.96E+01 -2.13E+00 -1.62E+00 1.48E+01 -9.06E-01 <![CDATA[A4]]> 6.00E-02 4.92E-02 -6.17E-02 -3.01E-01 -4.45E-03 -1.68E-01 <![CDATA[A6]]> -4.16E-02 -4.12E-02 1.47E-01 1.45E+00 -9.73E-02 -1.67E-01 <![CDATA[A8]]> 3.45E-02 4.97E-02 -9.12E-01 -6.77E+00 8.81E-01 1.22E+00 <![CDATA[A 10 ]]> -2.21E-02 -4.75E-02 2.44E+00 3.07E+01 -9.82E+00 -6.26E+00 <![CDATA[A 12 ]]> 1.02E-02 3.10E-02 -4.15E+00 -1.24E+02 6.34E+01 1.71E+01 <![CDATA[A 14 ]]> -3.26E-03 -1.35E-02 3.38E+00 3.87E+02 -2.46E+02 -2.59E+01 <![CDATA[A 16 ]]> 7.03E-04 3.81E-03 9.76E-02 -7.90E+02 5.53E+02 1.90E+01 <![CDATA[A 18 ]]> -9.16E-05 -6.30E-04 -1.76E+00 9.12E+02 -6.57E+02 -2.97E+00 <![CDATA[A 20 ]]> 5.53E-06 4.69E-05 7.26E-01 -4.32E+02 3.18E+02 -1.97E+00 Surface serial number 8 9 10 11 12 13 k -9.16E+00 -4.30E+01 4.93E+00 -4.45E+00 -1.37E+00 -4.54E+00 <![CDATA[A4]]> -8.99E-01 -4.21E-01 -1.30E-01 -2.36E-01 -2.36E-01 -1.11E-01 <![CDATA[A6]]> 1.83E+00 6.24E-01 1.12E-01 2.93E-01 1.03E-01 4.82E-02 <![CDATA[A8]]> -5.16E+00 -7.11E-01 5.58E-02 -3.26E-01 -2.40E-02 -1.36E-02 <![CDATA[A 10 ]]> 1.42E+01 6.33E-01 -1.59E-01 3.23E-01 2.39E-03 1.58E-03 <![CDATA[A 12 ]]> -2.88E+01 -3.75E-01 1.21E-01 -1.83E-01 2.76E-04 3.16E-04 <![CDATA[A 14 ]]> 4.02E+01 1.49E-01 -4.29E-02 5.11E-02 -1.22E-04 -1.61E-04 <![CDATA[A 16 ]]> -3.43E+01 -2.71E-02 5.07E-03 -5.63E-03 1.66E-05 2.78E-05 <![CDATA[A 18 ]]> 1.57E+01 3.53E-09 -8.71E-05 -1.20E-05 -1.08E-06 -2.30E-06 <![CDATA[A 20 ]]> -2.93E+00 2.45E-09 9.10E-06 1.31E-06 2.79E-08 7.49E-08

[0151] Table 6 below shows important parameters in Example 2.

[0152] Table 6 is a table of important parameters of Example 2.

[0153]

[0154]

[0155] The specific lens structure of this embodiment is as follows Figure 5 Table 4-6 and Figure 5 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the current embodiment is an optical imaging lens that can achieve a wide angle and miniaturization.

[0156] Figure 6The on-axis astigmatism curve of this embodiment is shown. The maximum difference between the astigmatism S line and T line of the lens is about 0.03 mm, indicating that the lens has a good ability to improve astigmatism.

[0157] Figure 7 The distortion curve of this embodiment is shown. The maximum distortion of the lens is less than 1%, indicating that the lens has a good ability to improve distortion.

[0158] Figure 8 The modulation transfer function curve of this embodiment is shown. When the lens is at infinite object distance, the modulation transfer function (MTF) of the test frequency (110lp / mm) is greater than 0.5 at both on-axis and off-axis points, indicating that the lens has good performance.

[0159] Therefore, the optical imaging lens of this embodiment has the characteristics of miniaturization, wide viewing angle, small distortion, and large image surface.

[0160] Example 3

[0161] The present embodiment provides an optical imaging lens, which is composed of a first lens 1, a second lens 2, an aperture 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a filter 8 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The second lens 2 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The third lens 3 has a positive refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a convex surface. The fourth lens 4 has a negative refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The fifth lens 5 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The sixth lens 6 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The filter 8 is arranged between the sixth lens 6 and the image plane.

[0162] Table 7 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 3. The units of the radius of curvature and thickness are both millimeters (mm).

[0163] Table 7 is a table of lens parameters of Example 3

[0164]

[0165] In this embodiment, each aspherical surface shape can be defined by the formula (1) in the above embodiment 1. Table 8 below shows the high-order coefficients of each aspherical mirror surface that can be used in embodiment 3.

[0166] Table 8 is a table of high-order coefficients of various aspherical mirror surfaces in Example 3

[0167]

[0168]

[0169] Table 9 below shows important parameters in Example 3.

[0170] Table 9 is a table of important parameters of Example 3.

[0171]

[0172] The specific lens structure of this embodiment is as follows Fig. 9 As shown in Table 7-9 and Fig. 9 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the current embodiment is an optical imaging lens that can achieve a wide angle and miniaturization.

[0173] Fig.10 The on-axis astigmatism curve of this embodiment is shown. The maximum difference between the astigmatism S line and T line of the lens is about 0.03 mm, indicating that the lens has a good ability to improve astigmatism.

[0174] Fig.11 The distortion curve of this embodiment is shown. The maximum distortion of the lens is less than 1%, indicating that the lens has a good ability to improve distortion.

[0175] Fig.12 The modulation transfer function curve of this embodiment is shown. When the lens is at infinite object distance, the modulation transfer function (MTF) of the test frequency (110lp / mm) is greater than 0.5 at both on-axis and off-axis points, indicating that the lens has good performance.

[0176] Therefore, the optical imaging lens of this embodiment has the characteristics of miniaturization, wide viewing angle, small distortion, and large image surface.

[0177] Example 4

[0178] The present embodiment provides an optical imaging lens, which is composed of a first lens 1, a second lens 2, an aperture 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a filter 8 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The second lens 2 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The third lens 3 has a positive refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a convex surface. The fourth lens 4 has a negative refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The fifth lens 5 has a positive refractive power, and its object side surface in the paraxial region is a concave surface, and the image side surface is a convex surface. The sixth lens 6 has a negative refractive power, and its object side surface in the paraxial region is a convex surface, and the image side surface is a concave surface. The filter 8 is arranged between the sixth lens 6 and the image plane.

[0179] Table 10 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 4. The units of the radius of curvature and thickness are both millimeters (mm).

[0180] Table 10 is a table of lens parameters of Example 4

[0181]

[0182] In this embodiment, the surface shape of each aspheric surface can be defined by the formula (1) in the above-mentioned embodiment 1.

[0183] Table 11 below shows the high-order coefficients that can be used for each aspherical mirror surface in Example 4.

[0184] Table 11 is a table of high-order coefficients of various aspherical mirror surfaces in Example 4

[0185]

[0186]

[0187] Table 12 below shows important parameters in Example 4.

[0188] Table 12 is a table of important parameters of Example 4.

[0189]

[0190] The specific lens structure of this embodiment is as follows Fig.13 Table 10-12 and Fig.13 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the current embodiment is an optical imaging lens that can achieve a wide angle and miniaturization.

[0191] Fig.14The on-axis astigmatism curve of this embodiment is shown. The maximum difference between the astigmatism S line and T line of the lens is about 0.03 mm, indicating that the lens has a good ability to improve astigmatism.

[0192] Fig.15 The distortion curve of this embodiment is shown. The maximum distortion of the lens is less than 1%, indicating that the lens has a good ability to improve distortion.

[0193] Fig.16 The modulation transfer function curve of this embodiment is shown. When the lens is at infinite object distance, the modulation transfer function (MTF) of the test frequency (110lp / mm) is greater than 0.5 at both on-axis and off-axis points, indicating that the lens has good performance.

[0194] Therefore, the optical imaging lens of this embodiment has the characteristics of miniaturization, wide viewing angle, small distortion, and large image surface.

[0195] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optical imaging lens, which is composed of the following components from the object side to the image side along the optical axis: A first lens having positive refractive power, wherein the image-side surface of the first lens comprises at least one inflection point; a second lens having negative refractive power; a third lens having positive refractive power, wherein the object side surface of the third lens is a convex surface; a fourth lens having negative refractive power, wherein the image side surface of the fourth lens is a convex surface; a fifth lens having positive refractive power; a sixth lens having negative refractive power; The lens satisfies the following relationship: TTL / Imgh<1.52 tan(HFOV)≥1 in, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, Imgh is half of the diagonal length of the effective pixel area of ​​the lens, and HFOV is half of the maximum field of view of the lens.

2. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: 0% <OPD<1% Among them, OPD is the maximum value of optical distortion of the optical imaging lens.

3. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: -0.7 <f3 / f4<-0.5 Among them, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

4. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: 1.1 <R1 / R2<1.3 2 <R8 / R7<2.6 Wherein, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens; R8 is the curvature radius of the image side surface of the fourth lens, and R7 is the curvature radius of the object side surface of the fourth lens.

5. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: 0.35<(CT3+CT4) / ΣCT<0.45 Wherein, CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and ΣCT is the total thickness of the lenses contained in the lens on the optical axis.

6. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: 1.4<(CT4+CT5) / (T34+T45)<1.9 Among them, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T34 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and T45 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis.

7. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: (V3+V5) / (V1+V2)>2.3 Wherein, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

8. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: 2.8 <SAG51 / SAG61<3.5 Among them, SAG51 is the on-axis distance between the effective radius vertices of the object side of the fifth lens, and SAG61 is the on-axis distance between the effective radius vertices of the object side of the sixth lens.

9. The optical imaging lens according to claim 1, wherein: The lens satisfies the following relationship: Imgh / Fno>1.35 Among them, Imgh is half of the diagonal length of the effective pixel area, and Fno is the aperture number of the lens.

Images