Small-volume mobile phone camera lens

Abstract

The invention discloses a small-volume mobile phone camera lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has a negative refractive power; the second lens has a negative refractive power, and the image side surface is a concave surface; the third lens has a positive refractive power, and the object side surface is a convex surface; the fourth lens has a negative refractive power, and the image side surface is a concave surface; the fifth lens has a positive refractive power; the seventh lens has a positive refractive power, and both the image side surface and the object side surface are convex surfaces; the eighth lens has a negative refractive power, and the paraxial image side surface is a concave surface, and at least one convex surface is present on the off-axis image side surface; the surfaces of the eight lenses are all aspherical surfaces; and the following conditional formula is satisfied: TL / (MIC×2)<0.76, wherein TL is the total optical height from the object side surface of the first lens to the image plane; and MIC is the maximum half image height of the lens imaging on the image plane.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses and relates to a small-volume mobile phone camera lens. Background Art

[0002] With the continuous development of imaging CCD chips, imaging chips have been significantly improved in both size and imaging quality. With the rapid development of mobile phones, the size of mobile phones has gradually developed in a lighter and thinner direction, which exposes the limitations of current mobile phone development. Mobile phones need to be equipped with camera lenses that can take clearer images, but the current mainstream 6-element and 7-element camera lenses cannot achieve higher resolution capabilities, and cannot take clearer images. At this time, an 8-element camera lens is needed to improve the clarity of mobile phone cameras, but too many lenses increase the size of the camera lens. And mobile phone camera lenses need large apertures to adapt to more complex shooting environments. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a small-volume mobile phone camera lens with a smaller volume, a smaller F number and a higher imaging capability.

[0004] A small-volume mobile phone camera lens of the present invention comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has a negative refractive power; the second lens has a negative refractive power, and the image side surface is a concave surface; the third lens has a positive refractive power, and the object side surface is a convex surface; the fourth lens has a negative refractive power, and the image side surface is a concave surface; the fifth lens has a positive refractive power; the seventh lens has a positive refractive power, and both the image side surface and the object side surface are convex surfaces; the eighth lens has a negative refractive power, and the paraxial image side surface is a concave surface, and at least one convex surface is present on the off-axis image side surface; the surfaces of the eight lenses are all aspherical surfaces; and the following conditional formula is satisfied:

[0005] TL / (MIC×2)<0.76

[0006] Wherein, TL is the total optical height from the object side surface of the first lens to the image plane; MIC is the maximum half image height of the lens on the image plane.

[0007] In the small-volume mobile phone camera lens of the present invention, the camera lens also satisfies the following relationship:

[0008] 0.3 <F13 / F<0.85

[0009] -0.7 <R4 / F2<0

[0010] R5 / F3<0.6

[0011] 0.1 <TL13 / TTL<0.3

[0012] Among them, F13 is the focal length from the first lens to the third lens, and F is the focal length of the lens; wherein, R4 is the radius of the image side surface of the second lens, and F2 is the focal length of the second lens; R5 is the curvature radius of the object side surface of the third lens, and F3 is the focal length of the third lens of the lens; TL13 is the distance from the center of the object side surface of the first lens to the center of the image side surface of the third lens, and TTL is the total optical height of the camera lens.

[0013] In the small-volume mobile phone camera lens of the present invention, the camera lens also satisfies the following relationship:

[0014] -4.0 <F45 / F<-1.0

[0015] Among them, F45 is the focal length of the fourth lens and the fifth lens group as a whole, and F is the focal length of the camera lens.

[0016] In the small-volume mobile phone camera lens of the present invention, the camera lens also satisfies the following relationship:

[0017] -1 <R8 / F4<0

[0018] Wherein, R8 is the curvature radius of the image-side surface of the fourth lens, and F4 is the focal length of the fourth lens.

[0019] In the small-volume mobile phone camera lens of the present invention, the camera lens also satisfies the following relationship:

[0020] 7 <YC16 / SG16<10

[0021] Among them, YC16 is the distance from the most convex point of the off-axis image side surface of the eighth lens to the optical axis, and SG16 is the vector height of the most convex point of the off-axis image side surface of the eighth lens, that is, the distance from the convex point of the image side surface of the eighth lens to the center of the image side mirror on the optical axis.

[0022] In the small-volume mobile phone camera lens of the present invention, the camera lens also satisfies the following relationship:

[0023] Fno<2.0

[0024] Wherein, Fno is the F number of the camera lens.

[0025] The present invention discloses a small-volume mobile phone camera lens, which uses 8 lenses, can correct the influence of phase difference on the lens and improve the lens resolution, so that the image captured by the camera lens is clearer. And by adjusting the focal length, surface shape, center thickness of each lens and the axis spacing between each lens, the camera lens has a smaller volume and the mobile phone equipped with the lens is thinner. At the same time, the camera lens also has a larger aperture, that is, a smaller F number, which can meet the user's demand for clear image quality in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a small-volume mobile phone camera lens of Example 1;

[0027] Figure 2A is an on-axis astigmatism curve diagram of Example 1;

[0028] Figure 2B is a distortion curve diagram of Example 1;

[0029] Figure 2C is the MTF curve diagram of Example 1;

[0030] Figure 3 is a schematic structural diagram of a small-volume mobile phone camera lens of Example 2;

[0031] Figure 4A is an on-axis astigmatism curve diagram of Example 2;

[0032] Figure 4B is a distortion curve diagram of Example 2;

[0033] Figure 4C is the MTF curve diagram of Example 2;

[0034] Figure 5 is a schematic structural diagram of a small-volume mobile phone camera lens of Example 3;

[0035] Fig. 6A is an on-axis astigmatism curve diagram of Example 3;

[0036] Figure 6B is a distortion curve diagram of Example 3;

[0037] Figure 6C This is the MTF curve diagram of Example 3. DETAILED DESCRIPTION

[0038] A small-volume mobile phone camera lens of the present invention comprises a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, a sixth lens P6, a seventh lens P7 and an eighth lens P8 which are arranged in sequence from the object side to the image side along the optical axis.

[0039] The first lens has negative refractive power; the second lens has negative refractive power, and the image side surface is concave; the third lens has positive refractive power, and the object side surface is convex; the fourth lens has negative refractive power, and the image side surface is concave; the fifth lens has positive refractive power; the seventh lens has positive refractive power, and both the image side surface and the object side surface are convex; the eighth lens has negative refractive power, and the paraxial image side surface is concave, and there is at least one convex surface on the off-axis image side surface; the surfaces of the 8 lenses are all aspherical; and the following conditional formula is satisfied:

[0040] TL / (MIC×2)<0.76

[0041] Wherein, TL is the total optical height from the object side surface of the first lens to the image plane; MIC is the maximum half image height of the lens on the image plane. When this condition is met, the lens can be small and thin with multiple lenses.

[0042] In a specific implementation, the camera lens also satisfies the following relationship:

[0043] 0.3 <F13 / F<0.85

[0044] -0.7 <R4 / F2<0

[0045] R5 / F3<0.6

[0046] 0.1 <TL13 / TTL<0.3

[0047] Among them, F13 is the focal length from the first lens to the third lens, and F is the focal length of the lens; Among them, R4 is the radius of the image side surface of the second lens, and F2 is the focal length of the second lens; R5 is the curvature radius of the object side surface of the third lens, and F3 is the focal length of the third lens of the lens; TL13 is the distance from the center of the object side surface of the first lens to the center of the image side surface of the third lens, and TTL is the total optical height of the camera lens. A lens that meets the above conditions can reduce the influence of astigmatism and distortion on the lens, so that the lens can present a clearer image.

[0048] In a specific implementation, the camera lens also satisfies the following relationship:

[0049] -4.0 <F45 / F<-1.0

[0050] Wherein, F45 is the focal length of the fourth lens and the fifth lens group as a whole, and F is the focal length of the camera lens. After the lens meets this condition, the influence of distortion can be further reduced, thereby improving the imaging quality of the lens.

[0051] In a specific implementation, the camera lens also satisfies the following relationship:

[0052] -1 <R8 / F4<0

[0053] Wherein, R8 is the curvature radius of the image side surface of the fourth lens, and F4 is the focal length of the fourth lens. When this condition is met, the lens can achieve miniaturization of the lens volume.

[0054] In a specific implementation, the camera lens also satisfies the following relationship:

[0055] 7 <YC16 / SG16<10

[0056] Among them, YC16 is the distance from the most convex point of the off-axis image side surface of the eighth lens to the optical axis, and SG16 is the sag height of the most convex point of the off-axis image side surface of the eighth lens, that is, the distance from the convex point of the image side surface of the eighth lens to the center of the image side mirror on the optical axis. When this condition is met, the resolution of the lens will be improved to a certain extent, allowing the optical lens to capture clear images.

[0057] In a specific implementation, the camera lens also satisfies the following relationship:

[0058] Fno<2.0

[0059] Wherein, Fno is the F number of the camera lens. When this condition is met, the lens can have a larger aperture, allowing the lens to adapt to environments under different lighting conditions.

[0060] The object side and image side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all aspherical surfaces, wherein the aspherical coefficients satisfy the following equation:

[0061]

[0062] Among them, Z is the aspheric surface vector height, c is the aspheric surface paraxial curvature, y is the lens aperture, k is the cone coefficient, A4 is the 4th aspheric surface coefficient, A6 is the 6th aspheric surface coefficient, A8 is the 8th aspheric surface coefficient, A10 is the 10th aspheric surface coefficient, A12 is the 12th aspheric surface coefficient, A14 is the 14th aspheric surface coefficient, A16 is the 16th aspheric surface coefficient, A18 is the 18th aspheric surface coefficient, and A20 is the 20th aspheric surface coefficient.

[0063] Example 1

[0064] The following reference Figure 1 This is a 2D diagram of a camera lens according to Example 1 of the present application.

[0065] like Figure 1As shown, the camera lens of this embodiment includes, in order from the object side to the image side along the optical axis: the first lens has negative refractive power; the second lens has negative refractive power; the third lens has positive refractive power; the fourth lens has negative refractive power, the fifth lens has positive refractive power, the sixth lens has positive refractive power; the seventh lens has positive refractive power; the eighth lens has negative refractive power; and the filter has an object side surface and an image side surface. The incident light passes through the surfaces of each lens in order and finally forms an image on the imaging surface.

[0066] Tables 1(a), 1(b), and 1(c) show the surface type, curvature radius, thickness, and material of each lens of the imaging lens of Example 1. The units of the curvature radius and thickness are both millimeters (mm).

[0067] Please refer to the following table for the specific design parameters of the lens assembly of this embodiment:

[0068] Table 1(a)

[0069]

[0070]

[0071] Table 1(b)

[0072] Surface serial number K A4 A6 A8 S1 -8.15E+01 -1.23E-01 2.48E-02 -1.33E-02 S2 7.54E+02 3.32E-02 -5.41E-03 -5.19E-04 S3 1.37E+01 6.41E-02 -2.30E-02 1.45E-02 S4 -1.00E+03 3.73E-03 2.06E-03 3.43E-03 S5 -8.78E-01 -1.79E-02 1.79E-03 -1.40E-03 S6 -2.38E+01 -3.36E-02 6.49E-04 -5.99E-04 S7 9.90E+01 -3.86E-03 3.96E-03 -9.32E-05 S8 6.15E+00 8.53E-03 1.55E-03 7.56E-04 S9 5.22E+01 -7.81E-02 -9.14E-03 3.48E-03 S10 1.02E+02 -1.63E-01 -1.61E-03 7.00E-03 S11 -1.00E+02 -1.25E-01 -6.17E-03 -7.11E-04 S12 -2.24E+01 -2.88E-01 6.38E-02 -1.53E-02 S13 -9.32E+00 -8.32E-01 2.46E-02 1.33E-01 S14 -1.26E+01 9.23E-02 -1.95E-01 7.14E-02 S15 2.24E+01 -6.05E-01 4.77E-01 -1.62E-01 S16 -6.72E+00 -1.80E+00 1.68E-01 -1.32E-01 Surface serial number A10 A12 A14 A16 S1 5.29E-03 -5.10E-03 3.46E-03 -1.21E-03 S2 3.00E-03 1.05E-03 3.23E-05 3.64E-04 S3 -8.20E-03 7.38E-04 -1.36E-03 1.62E-05 S4 1.35E-04 7.62E-04 -2.85E-04 -1.85E-04 S5 -3.70E-04 -1.42E-04 -5.21E-05 -1.37E-05 S6 -2.50E-04 -5.14E-05 -1.14E-05 -8.09E-07 S7 -2.33E-04 3.00E-05 -3.80E-06 3.20E-06 S8 -1.30E-04 8.71E-05 1.76E-05 1.68E-05 S9 2.27E-04 2.44E-04 8.39E-05 9.48E-05 S10 1.84E-04 5.15E-04 5.45E-04 3.43E-04 S11 -7.75E-03 -2.36E-04 -2.33E-04 2.91E-04 S12 -3.16E-03 2.28E-03 -1.56E-03 -2.15E-03 S13 -1.64E-03 3.02E-02 7.52E-02 6.52E-02 S14 -1.72E-02 -6.08E-03 5.58E-03 -4.33E-04 S15 5.61E-02 -1.15E-02 1.48E-02 -1.13E-03 S16 9.86E-03 -6.79E-02 -2.40E-02 -2.35E-02

[0073] In this embodiment, the specific parameters are shown in the following table:

[0074] Table 1(c)

[0075]

[0076] According to Table 1(a), Table 1(b) and Figure 1 , the lens shape and various properties of the lens of the current embodiment are more clearly displayed, indicating that the current embodiment is a camera lens that can be miniaturized.

[0077] According to Table 1(c) Figure 2A S represents the focus offset in the sagittal direction, and T represents the focus offset in the meridional direction. The astigmatism curve shows clearly that after the lens meets the requirements of the claims, the maximum difference between the astigmatism S line and the T line of the lens is about 0.05mm, indicating that the lens has a good ability to improve astigmatism.

[0078] According to Table 1(c) Figure 2B The distortion curve shows clearly that after the lens meets the requirements of the claims, the maximum distortion of the lens is less than 2% and the overall trend is monotonically increasing, indicating that the lens has a good ability to improve distortion.

[0079] According to Table 1(c) Figure 2CThe MTF curves of the 0F, 0.2F, 0.4F, 0.6F and 0.8F fields of view of the middle lens, after the lens meets the requirements of the claims, the mtf curves of each field of view are relatively concentrated and the downward trend is slow, indicating that the current embodiment can present high-quality images.

[0080] Example 2

[0081] The following reference Figure 3 A 2D diagram of the optical lens is given according to Example 2.

[0082] like Figure 3 As shown, the camera lens of this embodiment includes, from the object side to the image side along the optical axis: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; a sixth lens having negative refractive power; a seventh lens having positive refractive power; an eighth lens having negative refractive power; and a filter having an object side surface and an image side surface. The incident light passes through the surfaces of each lens in sequence and finally forms an image on the imaging surface.

[0083] Tables 2(a), 2(b), and 2(c) show the surface type, curvature radius, thickness, and material of each lens of the imaging lens of Example 2. The units of the curvature radius and thickness are both millimeters (mm).

[0084] In this embodiment, please refer to the following table for specific design parameters:

[0085] Table 2(a)

[0086]

[0087]

[0088] Table 2(b)

[0089] Surface serial number K A4 A6 A8 S1 -1.02E+01 1.48E-02 7.76E-03 -3.59E-03 S2 -1.74E+05 -1.34E-02 7.13E-03 -9.04E-04 S3 2.23E+00 -1.57E-02 -6.15E-03 7.86E-03 S4 -2.80E+00 -8.57E-03 9.24E-04 4.33E-03 S5 -4.42E-01 -6.35E-03 6.43E-03 4.06E-04 S6 -2.38E+01 -3.20E-02 5.06E-03 3.01E-04 S7 9.90E+01 6.29E-04 9.01E-03 -1.02E-03 S8 7.31E+00 2.10E-02 1.02E-02 8.68E-04 S9 5.19E+01 -1.32E-01 -4.11E-03 3.85E-03 S10 9.80E+01 -1.73E-01 -6.70E-03 5.27E-03 S11 -1.00E+02 -2.48E-01 -1.31E-02 -8.35E-03 S12 -2.23E+01 -3.24E-01 4.99E-02 -5.56E-03 S13 -8.79E+00 -5.00E-01 -4.72E-02 6.31E-03 S14 -1.44E+01 -4.47E-01 -8.43E-02 2.69E-02 S15 1.43E+01 -7.61E-01 6.02E-01 -2.31E-01 S16 -8.80E+00 -2.02E+00 2.64E-01 -1.51E-01 Surface serial number A10 A12 A14 A16 S1 7.78E-04 -6.76E-05 9.47E-06 -6.45E-06 S2 6.68E-04 -1.33E-05 1.85E-05 -2.33E-06 S3 -1.31E-03 5.98E-05 2.30E-05 1.42E-05 S4 -6.88E-04 8.93E-06 4.45E-06 8.16E-06 S5 6.76E-04 2.73E-04 1.44E-04 6.69E-05 S6 3.91E-04 -1.73E-04 -7.08E-05 -3.96E-05 S7 -2.21E-04 -6.06E-04 -2.64E-04 -1.43E-04 S8 3.93E-04 -1.48E-04 -8.01E-05 -5.99E-05 S9 1.98E-03 5.47E-04 6.71E-05 -3.29E-05 S10 2.76E-03 9.80E-04 3.49E-04 1.20E-04 S11 -3.68E-03 -2.17E-03 -1.08E-03 -3.02E-04 S12 -7.89E-04 -6.91E-04 1.97E-04 2.96E-04 S13 2.41E-03 2.03E-03 3.21E-04 4.39E-04 S14 1.20E-02 -8.51E-03 -8.84E-03 -8.23E-04 S15 1.28E-01 -5.09E-02 2.62E-02 -3.66E-03 S16 5.97E-02 -3.17E-02 1.51E-02 -5.55E-03

[0090] In this embodiment, the specific parameters are shown in the following table:

[0091] Table 2(c)

[0092]

[0093] According to Table 2(a), Table 2(b) and Figure 3 , the lens shape and various properties of the lens of the current embodiment are more clearly displayed, indicating that the current embodiment is a camera lens that can be miniaturized.

[0094] According to Table 2(c) Figure 4AS represents the focus offset in the sagittal direction, and T represents the focus offset in the meridional direction. The astigmatism curve shows clearly that after the lens meets the requirements of the claims, the maximum difference between the astigmatism S line and the T line of the lens is about 0.02mm, indicating that the lens has a good ability to improve astigmatism.

[0095] According to Table 2(c) Figure 4B The distortion curve shows clearly that after the lens meets the requirements of the claims, the maximum distortion of the lens is less than 2% and the overall trend is monotonically increasing, indicating that the lens has a good ability to improve distortion.

[0096] According to Table 2(c) Figure 4C The MTF curves of the 0F, 0.2F, 0.4F, 0.6F and 0.8F fields of view of the middle lens, after the lens meets the requirements of the claims, the mtf curves of each field of view are concentrated and the downward trend is relatively slow, indicating that the current embodiment can present high-quality images.

[0097] Example 3

[0098] The following reference Figure 5 This is a 2D diagram of the optical lens according to Example 3.

[0099] like Figure 5 As shown, the camera lens of this embodiment includes, from the object side to the image side along the optical axis: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; a sixth lens having negative refractive power; a seventh lens having positive refractive power; an eighth lens having negative refractive power; and a filter having an object side surface and an image side surface. The incident light passes through the surfaces of each lens in sequence and finally forms an image on the imaging surface.

[0100] Tables 3(a), 3(b), and 3(c) show the surface type, curvature radius, thickness, and material of each lens of the optical lens of Example 3. The units of the curvature radius and thickness are both millimeters (mm).

[0101] In this embodiment, please refer to the following table for specific design parameters:

[0102] Table 3(a)

[0103] lens Surface serial number Surface type Radius of curvature thickness Material properties (Nd:Vd) thing Spherical Inf 990 P1 S1 Aspheric 163.138 0.26 1.516:57 S2 Aspheric 13.175 0.09 P2 S3 Aspheric 25.150 0.22 1.516:57 S4 Aspheric 23.162 0.36 Stop Spherical Inf -0.22 P3 S5 Aspheric 1.523 0.59 1.5445:55.987 S6 Aspheric 19.1678 0.14 P4 S7 Aspheric 21.860 0.23 1.6612：20.3540 S8 Aspheric 3.822 0.26 P5 S9 Aspheric 7.941 0.28 1.567:38 S10 Aspheric 11.496 0.25 P6 S11 Aspheric 3.643 0.26 1.6612：20.3540 S12 Aspheric 3.520 0.49 P7 S13 Aspheric 6.981 0.64 1.567:38 S14 Aspheric -2.072 0.35 P8 S15 Aspheric -12.688 0.26 1.567:38 S16 Aspheric 1.316 0.35 IR 17 Spherical Inf 0.21 BK7 18 Spherical Inf 0.37 19 Spherical Inf -0.001 picture Spherical

[0104] Table 3(b)

[0105] Surface serial number K A4 A6 A8 S1 1.11E-03 -9.06E-03 9.24E-03 -5.71E-03 S2 -1.17E+00 -1.44E-02 4.06E-03 -7.18E-03 S3 2.44E+00 1.13E-02 5.82E-03 9.43E-03 S4 -3.45E+00 -1.32E-02 1.04E-02 3.54E-03 S5 -5.33E-01 -9.32E-03 2.44E-03 -1.90E-04 S6 -2.38E+01 -2.81E-02 1.61E-03 2.97E-04 S7 9.90E+01 -6.10E-03 5.04E-03 2.90E-04 S8 7.66E+00 1.21E-02 5.68E-03 5.66E-04 S9 5.19E+01 -1.03E-01 -7.84E-03 1.13E-03 S10 1.02E+02 -1.74E-01 -4.56E-03 4.50E-03 S11 -1.00E+02 -1.66E-01 -1.29E-02 8.28E-04 S12 -2.23E+01 -2.99E-01 5.88E-02 -4.76E-03 S13 -8.79E+00 -9.37E-01 1.18E-01 9.95E-02 S14 -1.44E+01 -3.66E-01 -7.97E-02 4.00E-02 S15 1.95E+01 -5.68E-01 3.76E-01 -1.53E-01 S16 -9.08E+00 -1.24E+00 2.13E-01 -7.89E-02 Surface serial number A10 A12 A14 A16 S1 1.44E-02 -2.42E-05 4.32E-05 -6.93E-05 S2 -2.53E-03 -5.51E-05 9.49E-05 -4.01E-05 S3 -6.74E-03 4.01E-05 -8.32E-05 7.23E-05 S4 -2.21E-04 4.64E-05 -5.52E-05 3.65E-06 S5 5.12E-05 2.76E-05 -3.39E-06 -6.26E-07 S6 3.66E-05 3.49E-05 -1.31E-06 5.30E-07 S7 2.39E-05 3.94E-05 -5.47E-06 7.54E-06 S8 5.36E-05 -4.62E-05 -5.92E-05 -4.45E-05 S9 4.32E-04 6.21E-05 1.06E-05 2.29E-05 S10 1.86E-03 -1.24E-05 -3.22E-07 2.14E-07 S11 -1.74E-03 -7.50E-04 -7.89E-04 -4.52E-05 S12 -1.46E-04 -6.88E-04 1.44E-03 7.41E-04 S13 6.99E-03 4.72E-02 7.67E-02 5.76E-02 S14 2.13E-02 -9.91E-04 -2.26E-03 -1.80E-04 S15 7.10E-02 -2.42E-02 3.75E-03 -3.69E-04 S16 3.37E-02 -1.07E-02 5.46E-03 -1.31E-03

[0106] In this embodiment, the specific parameters are shown in the following table:

[0107] Table 3(c)

[0108]

[0109]

[0110] According to Table 3(a), Table 3(b) and Figure 5 , the lens shape and various properties of the lens of the current embodiment are more clearly displayed, indicating that the current embodiment is a camera lens that can be miniaturized.

[0111] According to Table 3(c) Fig. 6A S in the middle indicates the focus offset in the sagittal direction, and T indicates the focus offset in the meridional direction. The astigmatism curve in the middle shows clearly that after the lens meets the requirements of the claims, the maximum difference between the astigmatism S line and the T line of the lens is about 0.035mm, indicating that the lens has a good ability to improve astigmatism.

[0112] According to Table 3(c) Figure 6B The distortion curve shows clearly that after the lens meets the requirements of the claims, the maximum distortion of the lens is less than 2% and the overall trend is monotonically increasing, indicating that the lens has a good ability to improve distortion.

[0113] According to Table 3(c) Figure 4C The MTF curves of the 0F, 0.2F, 0.4F, 0.6F and 0.8F fields of view of the middle lens, after the lens meets the requirements of the claims, the mtf curves of each field of view are concentrated and the downward trend is relatively slow, indicating that the current embodiment can present high-quality images.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the concept of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A small-volume mobile phone camera lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object side to the image side along the optical axis, characterized in that: The first lens has negative refractive power; the second lens has negative refractive power, and the image side surface is concave; the third lens has positive refractive power, and the object side surface is convex; the fourth lens has negative refractive power, and the image side surface is concave; the fifth lens has positive refractive power; the seventh lens has positive refractive power, and both the image side surface and the object side surface are convex; the eighth lens has negative refractive power, and the paraxial image side surface is concave, and there is at least one convex surface on the off-axis image side surface; the surfaces of the 8 lenses are all aspherical; and the following conditional formula is satisfied: TTL / (MIC×2)<0.76 -4.0 <F45 / F<-1.0 Fno<2.0 Among them, TTL is the total optical height from the object side surface of the first lens to the image plane; MIC is the maximum half image height of the lens on the image plane; F45 is the focal length of the fourth lens and the fifth lens group as a whole, F is the focal length of the camera lens; Fno is the F number of the camera lens.

2. The small-volume mobile phone camera lens as claimed in claim 1, characterized in that: The camera lens also satisfies the following relationship: 0.3 <F13 / F<0.85 -0.7 <R4 / F2<0 R5 / F3<0.6 0.1 <TL13 / TTL<0.3 Among them, F13 is the focal length from the first lens to the third lens, and F is the focal length of the lens; wherein, R4 is the radius of the image side surface of the second lens, and F2 is the focal length of the second lens; R5 is the curvature radius of the object side surface of the third lens, and F3 is the focal length of the third lens of the lens; TL13 is the distance from the center of the object side surface of the first lens to the center of the image side surface of the third lens, and TTL is the total optical height of the camera lens.

3. The small-volume mobile phone camera lens as claimed in claim 1, characterized in that: The camera lens also satisfies the following relationship: -1 <R8 / F4<0 Wherein, R8 is the curvature radius of the image-side surface of the fourth lens, and F4 is the focal length of the fourth lens.

4. The small-volume mobile phone camera lens as claimed in claim 1, characterized in that: The camera lens also satisfies the following relationship: 7 <YC16 / SG16<10 Among them, YC16 is the distance from the most convex point of the off-axis image side surface of the eighth lens to the optical axis, and SG16 is the vector height of the most convex point of the off-axis image side surface of the eighth lens, that is, the distance from the convex point of the image side surface of the eighth lens to the center of the image side mirror on the optical axis.

Images