Optical imaging lens

Abstract

The invention relates to the technical field of optical lenses, in particular to an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, the second lens has negative focal power; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has negative focal power; the following conditions are satisfied: HFOVgt; 46 degrees; nd1gt; 1.7, 1.7; f4 / f6gt; 0.7, 0.7; dIS < = 2%. HFOV is half of the maximum field angle, Nd1 is the refractive index of the first lens, f4 is the focal length of the fourth lens, f6 is the focal length of the sixth lens, and DIS is optical distortion. The lens has the advantages of high resolution, wide angle, small distortion and excellent high and low temperature.

Description

Technical Field

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

[0002] As electronic devices gradually increase in the market, the performance requirements of electronic photosensitive elements are gradually increasing. Therefore, optical lenses with high imaging quality have become an indispensable part. With the rapid development of technology, the application range of electronic devices equipped with optical lenses has become wider, and the requirements for optical lenses have become more diverse. Optical lenses are required to have multiple qualities such as wide angle, small distortion, low temperature drift and high resolution. However, existing optical lenses are difficult to strike a balance between wide angle, small distortion, low temperature drift and high resolution. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an optical imaging lens, which is mainly composed of six lenses, the first lens adopts an aspherical glass lens, and the other five lenses adopt aspherical plastic lenses. By reasonably matching the optical focal length, surface shape and distribution parameters, it is ensured that the lens has high imaging quality, and the lens has the advantages of high resolution, wide angle, small distortion and excellent high and low temperature.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] An optical imaging lens, the lens including, from the object side to the image side along the optical axis:

[0006] The first lens has positive power, and the image side surface of the first lens is concave at the near optical axis;

[0007] The second lens has a negative optical power, the object side surface of the second lens is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0008] The third lens has positive power, and the object side of the third lens is convex near the optical axis;

[0009] The fourth lens has a negative optical power, the object side surface of the fourth lens is concave at the near optical axis, and the image side surface is convex at the near optical axis;

[0010] A fifth lens element having positive power, an object side surface of the fifth lens element being convex near the optical axis, having at least one inflection point, and an image side surface being convex near the optical axis;

[0011] A sixth lens element having negative optical power, wherein the object side surface of the sixth lens element is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0012] The lens satisfies the following conditional formula:

[0013] HFOV>46°

[0014] Nd1>1.7

[0015] |f4 / f6|>0.7

[0016] DIS ≤ 2%

[0017] Among them, HFOV is half of the maximum field of view of the lens, Nd1 is the refractive index of the first lens, f4 is the focal length of the fourth lens, f6 is the focal length of the sixth lens, and DIS is the optical distortion of the lens.

[0018] The wide-angle feature of this lens can be achieved by controlling the size of the maximum field of view;

[0019] By controlling the refractive index of the first lens, it is very helpful to improve the temperature drift of the lens and also helps to reduce spherical aberration;

[0020] By controlling the focal length ratio of the fourth lens and the sixth lens, the refractive power distribution of the image side end of the imaging system lens group can be adjusted, which helps to correct the aberration;

[0021] By controlling the distortion of the optical lens, the deformation of the image can be effectively reduced and the resolution can be improved.

[0022] Furthermore, the number of lenses with optical power in the lens is 6, the first lens is an aspherical glass lens, and the second lens to the fifth lens are all aspherical plastic lenses.

[0023] Furthermore, the lens satisfies the following conditional formula:

[0024] 0.7 <TTL / IMG<0.75

[0025] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, and IMG is the maximum imaging height of the lens.

[0026] By satisfying the above conditions, a balance can be struck between reducing the total length and increasing the imaging surface, achieving miniaturization.

[0027] Furthermore, the lens satisfies the following conditional formula:

[0028] 3.4<(R3+R4) / (R3-R4)<4

[0029] Wherein, R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens.

[0030] By satisfying the above conditions, it is possible to avoid excessive curvature or large shape changes of the second lens surface, which helps to prevent surface reflection or manufacturing problems.

[0031] Furthermore, the lens satisfies the following conditional formula:

[0032] 1.5 <TTL / f<1.6

[0033] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, and f is the focal length of this lens.

[0034] By satisfying the above conditions, the relationship between the total length of the lens and the lens characteristics is more balanced, which is conducive to forming wide-angle characteristics.

[0035] Furthermore, the lens satisfies the following conditional formula:

[0036] 0<(CT1+CT2) / T12<2.5

[0037] Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

[0038] By satisfying the above conditions, the first lens and the second lens cooperate with each other, which helps to compress the outer diameter of the object side end of the imaging system lens group.

[0039] Furthermore, the lens satisfies the following conditional formula:

[0040] R1 / CT1<6.4

[0041] Wherein, R1 is the curvature radius of the object side of the first lens, and CT1 is the thickness of the first lens on the optical axis.

[0042] By controlling the curvature radius and thickness of the first lens, the processing difficulty can be reduced and the processing possibility can be improved.

[0043] The beneficial effects of the present invention are:

[0044] The present invention provides an optical imaging lens, which is mainly composed of six lenses. The first lens adopts an aspherical glass lens, and the other five lenses adopt aspherical plastic lenses. By reasonably matching the optical focal length, surface shape and distribution parameters, it is ensured that the lens has high imaging quality, and the lens has the advantages of high resolution, wide angle, small distortion and excellent high and low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0046] Figure 2 axial chromatic aberration curve diagram of Example 1 of the present invention;

[0047] Figure 3 is an astigmatism curve diagram of Example 1 of the present invention;

[0048] Figure 4 is a distortion curve diagram of Example 1 of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0050] Figure 6 axial chromatic aberration curve diagram of Example 2 of the present invention;

[0051] Figure 7 is an astigmatism curve diagram of Example 2 of the present invention;

[0052] Figure 8 is a distortion curve diagram of Example 2 of the present invention;

[0053] Fig. 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0054] Fig.10 axial chromatic aberration curve diagram of Example 3 of the present invention;

[0055] Fig.11 is an astigmatism curve diagram of Example 3 of the present invention;

[0056] Fig.12 is a distortion curve diagram of Example 3 of the present invention;

[0057] Fig.13 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0058] Fig.14 axial chromatic aberration curve diagram of Example 4 of the present invention;

[0059] Fig.15 is an astigmatism curve diagram of Example 4 of the present invention;

[0060] Fig.16 is a distortion curve diagram of Example 4 of the present invention;

[0061] Fig.17 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0062] Fig.18 axial chromatic aberration curve diagram of Example 5 of the present invention;

[0063] Fig.19 is an astigmatism curve diagram of Example 5 of the present invention;

[0064] Fig. 20 This is a distortion curve diagram of Example 5 of the present invention.

[0065] 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

[0066] 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.

[0067] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0068] In this document, the surface of each lens closest to the object is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface.

[0069] like Figure 1-20 As shown, an optical imaging lens provided by an embodiment of the present invention includes the following components in order from the object side to the image side along the optical axis:

[0070] The first lens 1 has positive refractive power, and the image side surface of the first lens 1 is concave at the near optical axis;

[0071] The second lens 2 has a negative optical power, the object side surface of the second lens 2 is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0072] The third lens 3 has positive power, and the object side surface of the third lens 3 is convex at the near optical axis;

[0073] The fourth lens 4 has a negative optical power, the object side surface of the fourth lens 4 is concave at the near optical axis, and the image side surface is convex at the near optical axis;

[0074] A fifth lens element 5 has positive power, the object side surface of the fifth lens element 5 is convex near the optical axis, has at least one inflection point, and the image side surface is convex near the optical axis;

[0075] The sixth lens 6 has negative power, the object side surface of the sixth lens 6 is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0076] The lens satisfies the following conditional formula:

[0077] HFOV>46°

[0078] Nd1>1.7

[0079] |f4 / f6|>0.7

[0080] DIS ≤ 2%

[0081] Among them, HFOV is half of the maximum field of view of the lens, Nd1 is the refractive index of the first lens 1, f4 is the focal length of the fourth lens 4, f6 is the focal length of the sixth lens 6, and DIS is the optical distortion of the lens.

[0082] The wide-angle feature of this lens can be achieved by controlling the size of the maximum field of view;

[0083] By controlling the refractive index of the first lens 1, it is very helpful to improve the temperature drift of the lens and also helps to reduce the spherical aberration;

[0084] By controlling the focal length ratio of the fourth lens 4 and the sixth lens 6, the refractive power distribution of the image side end of the imaging system lens group can be adjusted, which helps to correct the aberration;

[0085] By controlling the distortion of the optical lens, the deformation of the image can be effectively reduced and the resolution can be improved.

[0086] Specifically, the number of lenses with optical power in the lens is 6, the first lens 1 is an aspherical glass lens, and the second lens 2 to the fifth lens 5 are all aspherical plastic lenses.

[0087] Specifically, the lens satisfies the following conditional formula:

[0088] 0.7 <TTL / IMG<0.75

[0089] 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, and IMG is the maximum imaging height of the lens.

[0090] By satisfying the above conditions, a balance can be struck between reducing the total length and increasing the imaging surface, achieving miniaturization.

[0091] Specifically, the lens satisfies the following conditional formula:

[0092] 3.4<(R3+R4) / (R3-R4)<4

[0093] Wherein, R3 is the curvature radius of the object side surface of the second lens 2, and R4 is the curvature radius of the image side surface of the second lens 2.

[0094] By satisfying the above conditions, it is possible to avoid excessive curvature or large shape changes of the surface of the second lens 2, which helps to prevent surface reflection or manufacturing problems.

[0095] Specifically, the lens satisfies the following conditional formula:

[0096] 1.5 <TTL / f<1.6

[0097] 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, and f is the focal length of the lens.

[0098] By satisfying the above conditions, the relationship between the total length of the lens and the lens characteristics is more balanced, which is conducive to forming wide-angle characteristics.

[0099] Specifically, the lens satisfies the following conditional formula:

[0100] 0<(CT1+CT2) / T12<2.5

[0101] Wherein, CT1 is the thickness of the first lens 1 on the optical axis, CT2 is the thickness of the second lens 2 on the optical axis, and T12 is the spacing distance between the first lens 1 and the second lens 2 on the optical axis.

[0102] By satisfying the above conditions, the first lens 1 and the second lens 2 cooperate with each other, which helps to compress the outer diameter of the object side end of the imaging system lens group.

[0103] Specifically, the lens satisfies the following conditional formula:

[0104] R1 / CT1<6.4

[0105] Wherein, R1 is the curvature radius of the object side surface of the first lens 1 , and CT1 is the thickness of the first lens 1 on the optical axis.

[0106] By controlling the curvature radius and thickness of the first lens 1, the processing difficulty can be reduced and the processing possibility can be improved.

[0107] The above-mentioned lens may further include a filter 8 for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface according to the specific needs of the embodiment. In the absence of specific requirements, the filter 8 or the protective glass may not be used.

[0108] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below 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.

[0109] Example 1

[0110] The present embodiment provides an optical imaging lens, which is composed of an aperture 7, a first lens 1, a second lens 2, 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. Incident light passes through the above components in sequence and is finally imaged on the image plane.

[0111] The first lens 1 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The sixth lens 6 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The filter 8 is arranged between the sixth lens 6 and the imaging surface of the lens.

[0112] 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).

[0113] Table 1 is a table of lens parameters of Example 1.

[0114]

[0115] In this embodiment, the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0116]

[0117] 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, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces that can be used in Example 1.

[0118] Table 2 is a table of high-order coefficients of various aspherical mirror surfaces in Example 1.

[0119]

[0120] Please refer to Table 11 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0121] Table 1-2 and Figure 1-4 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens has high imaging quality, and meets the requirements that the lens has high resolution, wide angle, small distortion and excellent high and low temperature.

[0122] Example 2

[0123] The present embodiment provides an optical imaging lens, which is composed of an aperture 7, a first lens 1, a second lens 2, 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. Incident light passes through the above components in sequence and is finally imaged on the image plane.

[0124] The first lens 1 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The sixth lens 6 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The filter 8 is arranged between the sixth lens 6 and the imaging surface of the lens.

[0125] Table 3 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).

[0126] Table 3 is a table of lens parameters of Example 2.

[0127]

[0128] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 4 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric mirror surface that can be used in embodiment 2.

[0129] Table 4 is a table of high-order coefficients of each aspherical mirror surface in Example 2.

[0130]

[0131] Please refer to Table 11 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0132] Table 3-4 and Figure 5-8 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens has high imaging quality, and meets the requirements that the lens has high resolution, wide angle, small distortion and excellent high and low temperature.

[0133] Example 3

[0134] The present embodiment provides an optical imaging lens, which is composed of an aperture 7, a first lens 1, a second lens 2, 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. Incident light passes through the above components in sequence and is finally imaged on the image plane.

[0135] The first lens 1 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The sixth lens 6 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The filter 8 is arranged between the sixth lens 6 and the imaging surface of the lens.

[0136] Table 5 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).

[0137] Table 5 is a table of lens parameters of Example 3.

[0138]

[0139]

[0140] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 6 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric mirror surface that can be used in embodiment 3.

[0141] Table 6 is a table of high-order coefficients of each aspherical mirror surface in Example 3.

[0142]

[0143] Please refer to Table 11 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0144] Table 5-6 and Figure 9-12 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens has high imaging quality, and meets the requirements that the lens has high resolution, wide angle, small distortion and excellent high and low temperature.

[0145] Example 4

[0146] The present embodiment provides an optical imaging lens, which is composed of an aperture 7, a first lens 1, a second lens 2, 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. Incident light passes through the above components in sequence and is finally imaged on the image plane.

[0147] The first lens 1 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The sixth lens 6 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The filter 8 is arranged between the sixth lens 6 and the imaging surface of the lens.

[0148] Table 7 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).

[0149] Table 7 is a table of lens parameters of Example 4.

[0150]

[0151] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 8 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric mirror surface that can be used in embodiment 4.

[0152] Table 8 is a table of high-order coefficients of each aspherical mirror surface in Example 4.

[0153]

[0154] Please refer to Table 11 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0155] Table 5-6 and Figure 9-12 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens has high imaging quality, and meets the requirements that the lens has high resolution, wide angle, small distortion and excellent high and low temperature.

[0156] Example 5

[0157] The present embodiment provides an optical imaging lens, which is composed of an aperture 7, a first lens 1, a second lens 2, 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. Incident light passes through the above components in sequence and is finally imaged on the image plane.

[0158] The first lens 1 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The sixth lens 6 has negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The filter 8 is arranged between the sixth lens 6 and the imaging surface of the lens.

[0159] Table 9 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 5. The units of the radius of curvature and thickness are both millimeters (mm).

[0160] Table 9 is a table of lens parameters of Example 5.

[0161]

[0162] In this embodiment, each aspheric surface type can be defined by the formula (1) in the above embodiment 1. Table 10 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric mirror surface that can be used in embodiment 5.

[0163] Table 10 is a table of high-order coefficients of each aspherical mirror surface in Example 5.

[0164]

[0165] Please refer to Table 11 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0166] Table 9-10 and Figure 17-20 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens has high imaging quality, and meets the requirements that the lens has high resolution, wide angle, small distortion and excellent high and low temperature.

[0167] Table 11 is a numerical table of conditional formulas related to Examples 1-5.

[0168] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 HFOV 46.7° 46.5° 46.5° 47.4° 47.3° Nd1 1.768 1.768 1.756 1.749 1.750 |f4 / f6| 0.709 0.702 0.780 0.779 0.813 DIS 2％ 2％ 2％ 2％ 2％ TTL / IMG 0.743 0.746 0.748 0.733 0.729 (R3+R4) / (R3-R4) 3.953 3.528 3.526 3.587 3.500 TTL / f 1.589 1.585 1.588 1.590 1.589 (CT1+CT2) / T12 2.224 2.194 2.204 2.110 2.166 R1 / CT1 6.226 6.127 6.042 6.315 6.160

[0169] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The lens includes the following components along the optical axis from the object side to the image side: The first lens has positive power, and the image side surface of the first lens is concave at the near optical axis; The second lens has a negative optical power, the object side surface of the second lens is convex at the near optical axis, and the image side surface is concave at the near optical axis; The third lens has positive power, and the object side of the third lens is convex near the optical axis; The fourth lens has a negative optical power, the object side surface of the fourth lens is concave at the near optical axis, and the image side surface is convex at the near optical axis; A fifth lens element having positive power, an object side surface of the fifth lens element being convex near the optical axis, having at least one inflection point, and an image side surface being convex near the optical axis; A sixth lens element having negative optical power, wherein the object side surface of the sixth lens element is convex at the near optical axis, and the image side surface is concave at the near optical axis; The lens satisfies the following conditional formula: HFOV>46° Nd1>1.7 |f4 / f6|>0.7 DIS ≤ 2% Among them, HFOV is half of the maximum field of view of the lens, Nd1 is the refractive index of the first lens, f4 is the focal length of the fourth lens, f6 is the focal length of the sixth lens, and DIS is the optical distortion of the lens.

2. The optical imaging lens according to claim 1, wherein: The lens has six lenses with optical power, the first lens is an aspherical glass lens, and the second to fifth lenses are all aspherical plastic lenses.

3. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 0.7 <TTL / IMG<0.75 Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, and IMG is the maximum imaging height of the lens.

4. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 3.4<(R3+R4) / (R3-R4)<4 Wherein, R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens.

5. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 1.5 <TTL / f<1.6 Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the lens on the optical axis, and f is the focal length of this lens.

6. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 0<(CT1+CT2) / T12<2.5 Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

7. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: R1 / CT1<6.4 Wherein, R1 is the curvature radius of the object side of the first lens, and CT1 is the thickness of the first lens on the optical axis.

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