An optical lens

Abstract

The present invention discloses an optical lens, which has an aperture, a filter, and also includes a six-piece telephoto lens composed of first to sixth lenses, wherein the first to sixth lenses are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has positive refractive power, and the object surface of the lens is convex; the second lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the third lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the fourth lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the object surface of the fifth lens at the paraxial position is concave; and the sixth lens has refractive power. The present invention can meet the needs of chip resolution with higher pixels, and the overall volume of the lens is small, and can be applied to mobile communication devices such as mobile phones, with clear imaging, effectively improving the influence of distortion and astigmatism on the lens, so that the optical system can take clear pictures within the working range.

Description

Technical Field

[0001] The invention relates to an optical lens used in mobile communication equipment. Background Art

[0002] With the rapid development of science and technology, mobile communication devices such as mobile phones have become important communication tools in daily life. One of the key conditions for evaluating the performance of mobile phones is the performance of the mobile phone lens. As an important information collection component in mobile phones, mobile phone lenses realize functions such as taking pictures, shooting videos and scanning. Among them, the telephoto system is an optical system that can clearly shoot distant objects. It is often used as an auxiliary lens in mobile phones to expand the shooting function of mobile phones. Due to the small number of early telephoto optical systems used, they cannot adapt to the current large-pixel chips, and their large size cannot adapt to the development trend of thinner and lighter mobile phones and the low clarity of captured images. Summary of the invention

[0003] In view of the shortcomings of the existing mid-focus telephoto system that cannot adapt to the current large-pixel chip requirements and is large in size, the problem to be solved by the present invention is to provide an optical lens that can meet the resolution requirements of higher-pixel chips and adapt to the development trend of flatter mobile phones.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] The present invention provides an optical lens, which has an aperture, a filter, and also includes a six-piece telephoto lens composed of first to sixth lenses, wherein the first to sixth lenses are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has positive refractive power, and the object surface of the lens is a convex surface; the second lens has negative refractive power, and the object surface of the lens is a convex surface, and the image surface is a concave surface; the third lens has negative refractive power, and the object surface of the lens is a convex surface, and the image surface is a concave surface; the fourth lens has negative refractive power, and the object surface of the lens is a convex surface, and the image surface is a concave surface; the object surface of the fifth lens at the paraxial position is a concave surface; the sixth lens has refractive power;

[0006] The above optical lens satisfies the following formula:

[0007] d34 / d45<2.5

[0008] 0<(cra-cra80%) / (IMA-IMA80%)<13

[0009] Wherein, d34 is the air distance from the center of the image plane of the third lens to the center of the object plane of the fourth lens along the optical axis, d45 is the air distance from the center of the image plane of the fourth lens to the center of the object plane of the fifth lens along the optical axis, cra is the angle between the chief ray of the outermost light beam and the image plane, IMA is the image height of the lens, cra80% is the angle between the chief ray of the light beam converging at 80% of the image height and the image plane, and IMA80% is 80% of the image height of the lens.

[0010] The optical lens of the present invention also satisfies the following relationship:

[0011] R1 / F1<0.6

[0012] Wherein, R1 is the radius of curvature of the object side surface of the first lens, and F1 is the focal length of the first lens.

[0013] The optical lens of the present invention also satisfies the following relationship:

[0014] F1 / F13<0.65

[0015] F2 / F13>-4

[0016] Among them, F1 is the focal length of the first lens, F13 is the overall focal length of the optical system formed by the first to third lenses; F2 is the focal length of the second lens.

[0017] The optical lens of the present invention also satisfies the following relationship:

[0018] 0.9 <CT4 / CT5<1.1

[0019] 0.5<|F4 / F5|<0.9

[0020] Among them, CT4 is the thickness of the fourth lens along the optical axis, CT5 is the thickness of the fifth lens along the optical axis; F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens.

[0021] The optical lens of the present invention also satisfies the following relationship:

[0022] R5-R6 / R5+R6>0.15

[0023] Among them, R5 is the curvature radius of the object-side surface of the third lens; R6 is the curvature radius of the object-side surface of the third lens.

[0024] The object side and image side surfaces of the first to sixth lenses are aspherical, and the aspherical coefficients satisfy the following equation:

[0025] Z=cy 2 / [1+{1-(1+k)c 2 y 2} 1 / 2 ]+A4y 4 +A6y6 +A8y 8 +A10y 10 +A12y 12 +A14y 14 +A16y 16

[0026] Among them, Z is the aspheric surface sag, 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, and A16 is the 16th aspheric surface coefficient.

[0027] The aperture is arranged between the second lens and the third lens, and the filter is arranged on the image side of the sixth lens.

[0028] The aperture is arranged on the object side of the first lens, and the filter is arranged on the image side of the sixth lens.

[0029] The present invention has the following beneficial effects and advantages:

[0030] 1. The present invention provides an optical system with six lenses, which can meet the needs of higher pixel chip resolution, and the overall size of the lens is small, which can be used in mobile communication devices such as mobile phones, has clear imaging, and can adapt to the development trend of flatter mobile phones.

[0031] 2. The optical system of the present invention can effectively improve the influence of distortion and astigmatism on the lens, so that the optical system can take clear pictures within the working range.

[0032] 3. The present invention uses an aspherical lens, and its ability to correct aberrations is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of an optical lens according to Embodiment 1 of the present invention;

[0034] Figure 2A Schematic diagram of the distortion curve of the optical lens in Example 1;

[0035] Figure 2B Schematic diagram of the astigmatism curve of the optical lens in Example 1;

[0036] Figure 2C Schematic diagram of the MTF curve of the optical lens in Example 1;

[0037] Figure 3 Schematic diagram of the structure of an optical lens according to Embodiment 1 of the present invention;

[0038] Figure 4A Schematic diagram of the distortion curve of the optical lens in Example 2;

[0039] Figure 4B Schematic diagram of the astigmatism curve of the optical lens in Example 2;

[0040] Figure 4C Schematic diagram of the MTF curve of the optical lens in Example 2;

[0041] Figure 5 Schematic diagram of the structure of an optical lens according to Embodiment 1 of the present invention;

[0042] Fig. 6A is a schematic diagram of a distortion curve of the optical lens in Example 31;

[0043] Figure 6B Schematic diagram of the astigmatism curve of the optical lens in Example 3;

[0044] Figure 6C Schematic diagram of the MTF curve of the optical lens in Example 3.

[0045] Among them, 1 to 6 are the first to sixth lenses, 7 is an aperture, and 8 is a filter. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] Example 1

[0048] The present invention provides an optical lens, which has an aperture 7 and a filter 8, and also includes a six-piece telephoto lens composed of first to sixth lenses 1 to 6, wherein the first to sixth lenses are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has positive refractive power, and the object surface of the first lens is convex; the second lens has negative refractive power, and the object surface of the second lens is convex, and the image surface of the lens is concave; the third lens has negative refractive power, and the object surface of the third lens is convex, and the image surface of the lens is concave; the fourth lens has negative refractive power, and the object surface of the fourth lens is convex, and the image surface is concave; the object surface of the fifth lens at the paraxial position is concave; the sixth lens has refractive power;

[0049] The above optical lens satisfies the following formula:

[0050] d34 / d45<2.5

[0051] 0<(cra-cra80%) / (IMA-IMA80%)<13

[0052] Wherein, d34 is the air distance from the image plane center of the third lens 3 to the object plane center of the fourth lens 4 along the optical axis, d45 is the air distance from the image plane center of the fourth lens 4 to the object plane center of the fifth lens 5 along the optical axis, cra is the angle between the chief ray of the outermost light beam and the image plane, IMA is the image height of the lens, cra80% is the angle between the chief ray of the light beam converging at 80% of the image height and the image plane, and IMA80% is 80% of the image height of the lens.

[0053] When the above conditions are met, the total optical height required for the lens can be reduced, thereby reducing the volume required for the lens in the mobile phone.

[0054] The above optical lens also satisfies the following relationship:

[0055] R1 / F1<0.6

[0056] Wherein, R1 is the radius of curvature of the object side surface of the first lens 1 (in millimeters), and F1 is the focal length of the first lens 1 of the lens (in millimeters).

[0057] When the above conditions are met, the MTF of the lens can be effectively improved, allowing the lens to capture clearer images with richer details.

[0058] The above optical lens also satisfies the following relationship:

[0059] F1 / F13<0.65

[0060] F2 / F13>-4

[0061] Wherein, F1 is the focal length of the first lens 1 (in millimeters), F13 is the focal length of the first lens 1 to the third lens 3 (in millimeters); and F2 is the focal length of the second lens 2 (in millimeters).

[0062] When the above conditions are met, the lens can effectively reduce the size of the lens on the head, thereby reducing the volume of the lens.

[0063] The above optical lens also satisfies the following relationship:

[0064] 0.9 <CT4 / CT5<1.1

[0065] 0.5<|F4 / F5|<0.9

[0066] Among them, CT4 is the thickness of the fourth lens 4 along the optical axis (in millimeters), and CT5 is the thickness of the fifth lens 5 along the optical axis (in millimeters); among them, F4 is the focal length of the fourth lens 4 (in millimeters), and F5 is the focal length of the fifth lens 5 (in millimeters).

[0067] After the above conditions are met, the lens will improve the influence of astigmatism on the optical system, making the captured image clearer.

[0068] The above optical lens also satisfies the following relationship:

[0069] R5-R6 / R5+R6>0.15

[0070] Wherein, R5 is the curvature radius of the object-side surface of the third lens 3 ; R6 is the curvature radius of the object-side surface of the third lens 3 .

[0071] When the above conditions are met, the lens can effectively reduce the impact of distortion on the optical system and make the captured images clearer.

[0072] The object side and image side surfaces of the first to sixth lenses 1 to 6 are aspherical, and the aspherical coefficients satisfy the following equation:

[0073] Z=cy 2 / [1+{1-(1+k)c 2 y 2} 1 / 2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 +A14y 14 +A16y 16

[0074] 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, and A16 is the 16th aspheric surface coefficient.

[0075] The use of aspherical lenses will greatly improve the ability to correct aberrations.

[0076] In this embodiment, the optical lens includes, from the object side to the image side along the optical axis, a first lens 1 with positive refractive power, a second lens 2 with negative refractive power, an aperture 7, a third lens 3 with negative refractive power; a fourth lens 4 with negative refractive power, a fifth lens 5 with negative refractive power, a sixth lens 6 with positive refractive power, and a filter 8. Light incident from the object side passes through the surfaces of each lens in sequence and finally forms an image on the imaging surface.

[0077] Table 1 (a) to Table 1 (c) show the surface type, curvature radius, thickness and material of each lens of the optical lens in this embodiment, wherein the units of curvature radius and thickness are both millimeters (mm).

[0078] Please refer to the following table for the specific design parameters of the lens assembly of this embodiment:

[0079] Table 1(a)

[0080]

[0081]

[0082] Table 1(b)

[0083] Face number K A4 A6 A8 A10 A12 A14 A16 S1 -5.40E-01 4.40E-03 7.00E-04 -1.67E-04 5.96E-04 -5.40E-04 1.77E-05 2.22E-05 S2 -4.56E+01 -5.94E-02 2.01E-01 -3.14E-01 2.61E-01 -1.21E-01 3.00E-02 -3.13E-03 S3 9.90E+01 -4.02E-02 3.04E-01 -5.69E-01 4.52E-01 -1.41E-01 -2.78E-03 6.76E-03 S4 1.60E+01 -4.81E-03 -1.85E-02 4.01E-04 7.82E-04 -5.80E-04 3.32E-04 9.13E-05 S5 -5.44E+00 7.35E-04 -2.56E-03 -3.66E-03 5.46E-04 9.58E-05 3.22E-04 1.02E-04 S6 4.40E+00 -1.00E-01 2.51E-01 -2.76E-01 5.05E-01 -1.06E+00 1.87E+00 -1.92E+00 S7 4.00E+01 -1.70E-01 1.62E-01 1.39E-01 -4.74E-01 7.47E-01 -7.54E-01 4.21E-01 S8 1.68E+00 -9.88E-02 1.82E-01 -6.25E-02 3.88E-02 -5.95E-02 5.00E-02 -2.45E-02 S9 8.12E+00 -5.41E-02 4.27E-03 1.66E-03 4.09E-03 -1.92E-03 -1.41E-04 2.14E-04 S10 9.90E+01 -3.67E-01 -1.77E-02 4.64E-03 -1.36E-03 1.23E-03 2.01E-04 -2.12E-05 S11 1.22E+01 3.44E-02 -7.28E-03 -2.46E-02 2.24E-02 -8.59E-03 1.84E-03 -1.98E-04 S12 -1.31E+01 -2.39E-02 1.37E-02 -1.72E-02 9.04E-03 -2.47E-03 3.52E-04 -2.27E-05

[0084] In this embodiment, the specific parameters of the lens are shown in the following table:

[0085] Table 1(c)

[0086]

[0087] According to Table 1(a), Table 1(b) and Figure 1 , which clearly shows the shape of the lenses and the various properties of the lenses of the current embodiment, and explains that the volume of the lenses can be effectively reduced by adjusting the shape and spacing of the lenses of the current embodiment.

[0088] According to Table 1(c) Figure 2A The medium distortion curve shows that when the conditions are met, the lens can reduce the impact of distortion on the optical system, thereby achieving clear images.

[0089] According to Table 1(c) Figure 2B The medium astigmatism curve shows that when the conditions are met, the lens can reduce the impact of astigmatism on the optical system and make the image on the entire image plane equally clear.

[0090] According to Table 1(c) Figure 2C The MTF curve in the middle shows that the lens can capture clear images when the conditions are met, and it performs well both in the outline and details of the object.

[0091] Example 2

[0092] like Figure 3 As shown, a 2D diagram of the optical lens is given for Example 2.

[0093] In this embodiment, the optical lens includes, from the object side to the image side along the optical axis, an aperture 7, a first lens 1 with positive refractive power, a second lens 2 with negative refractive power, a third lens 3 with negative refractive power, a fourth lens 4 with negative refractive power, a fifth lens 5 with negative refractive power, a sixth lens 6 with positive refractive power, and a filter 8. Light incident from the object side passes through the surfaces of each lens in sequence and is finally imaged on the imaging surface.

[0094] Table 2 (a) to Table 2 (c) show the surface type, curvature radius, thickness and material of each lens of the optical lens of Example 2. The units of the curvature radius and thickness are both millimeters (mm).

[0095] Please refer to the following table for specific design parameters of each lens in this embodiment:

[0096] Table 2(a)

[0097] lens Surface serial number Surface type Radius of curvature thickness Material properties (Nd:Vd) Physical surface Spherical INF 700 Aperture Spherical INF -0.47 P1 Aspheric 1.726 0.80 1.544500:55.99 Aspheric 21.711 0.10 P2 Aspheric 10.696 0.30 1.671300:13.42 Aspheric 5.553 0.68 P3 Aspheric -80.837 0.30 1.639700:23.5 Aspheric 4.965 0.40 P4 Aspheric -37.938 0.30 1.544500:55.99 Aspheric 5.027 1.65 P5 Aspheric -8.291 0.29 1.544500:55.99 Aspheric 8.376 0.23 P6 Aspheric -2600.445 1.00 1.639700:23.5 Aspheric -4.504 0.22 IR film Spherical INF 0.21 BK7 Spherical INF 0.52 Image plane Spherical INF

[0098] Table 2(b)

[0099] Face number K A4 A6 A8 A10 A12 A14 A16 S1 4.26E-02 -5.66E-02 6.52E-04 1.20E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 -1.88E+01 1.46E-02 2.62E-03 -1.17E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 5.87E+01 2.97E-02 1.12E-03 -2.12E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 2.06E+01 3.41E-02 -8.70E-04 -3.00E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 9.90E+01 5.34E-02 -1.63E-02 -1.71E-02 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 4.86E+00 3.22E-01 2.97E-02 1.20E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 -9.90E+01 -5.91E-04 1.33E-01 -4.73E-02 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.09E+01 6.41E-02 8.75E-02 -4.12E-02 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S9 1.23E+01 -3.11E-02 8.37E-03 -3.39E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S10 1.19E+01 -2.76E-02 -1.48E-03 -2.07E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -9.90E+01 1.88E-03 -9.06E-03 1.03E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S12 -7.01E-01 -1.66E-02 -1.99E-03 3.69E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0100] In this embodiment, the lens meets the requirements of the above-mentioned claim, and its specific parameters are shown in the following table:

[0101] Table 2(c)

[0102]

[0103] According to Table 2(a), Table 2(b) and Figure 3 , which clearly shows the shape of the lenses and the various properties of the lenses of the current embodiment, and explains that the volume of the lenses can be effectively reduced by adjusting the shape and spacing of the lenses of the current embodiment.

[0104] According to Table 2(c) Figure 4A The medium distortion curve shows that when the conditions are met, the lens can reduce the impact of distortion on the optical system, thereby achieving clear images.

[0105] According to Table 2(c) Figure 4B The medium astigmatism curve shows that when the conditions are met, the lens can reduce the impact of astigmatism on the optical system and make the image on the entire image plane equally clear.

[0106] According to Table 2(c) Figure 4C The MTF curve in the middle shows that the lens can capture clear images when the conditions are met, and it performs well both in the outline and details of the object.

[0107] Example 3

[0108] like Figure 5 As shown, it is a 2D diagram of the optical lens of this embodiment.

[0109] In this embodiment, the optical lens includes, from the object side to the image side along the optical axis, an aperture 7, a first lens 1 with positive refractive power, a second lens 2 with negative refractive power, a third lens 3 with negative refractive power, a fourth lens 4 with negative refractive power, a fifth lens 5 with negative refractive power, a sixth lens 6 with positive refractive power, and a filter 8. Light incident from the object side passes through the surfaces of each lens in sequence and is finally imaged on the imaging surface.

[0110] Table 3 (a) to Table 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).

[0111] In this embodiment, please refer to the following table for specific design parameters:

[0112] Table 3(a)

[0113] lens Surface serial number Surface type Radius of curvature thickness Material properties (Nd:Vd) Physical surface Spherical INF 700 Aperture Spherical INF -0.32 P1 Aspheric 1.684 0.74 1.535200:56.12 Aspheric 11.065 0.12 P2 Aspheric 10.667 0.30 1.670000:19.5 Aspheric 3.427 0.42 P3 Aspheric 7.077 0.30 1.535200:56.12 Aspheric 4.999 1.09 P4 Aspheric 6.105 0.30 1.661200:20.35 Aspheric 5.239 0.52 P5 Aspheric -5.344 0.30 1.535200:56.12 Aspheric -5.025 0.52 P6 Aspheric 6.473 0.27 1.517000:57 Aspheric 2.059 0.24 IR film Spherical INF 0.21 NBK7 Spherical INF 1.21 Image plane Spherical INF

[0114] Table 3(b)

[0115]

[0116]

[0117] In this embodiment, the lens meets the requirements of the above-mentioned claim, and its specific parameters are shown in the following table:

[0118] Table 3(c)

[0119]

[0120] According to Table 3(a), Table 3(b) and Figure 5 , which clearly shows the shape of the lenses and the various properties of the lenses of the current embodiment, and explains that the volume of the lenses can be effectively reduced by adjusting the shape and spacing of the lenses of the current embodiment.

[0121] According to Table 3(c) Fig. 6A The medium distortion curve shows that when the conditions are met, the lens can reduce the impact of distortion on the optical system, thereby achieving clear images.

[0122] According to Table 3(c) Figure 6B The medium astigmatism curve shows that when the conditions are met, the lens can reduce the impact of astigmatism on the optical system and make the image on the entire image plane equally clear.

[0123] According to Table 3(c) Figure 6C The MTF curve in the middle shows that the lens can capture clear images when the conditions are met, and it performs well both in the outline and details of the object.

Claims

1. An optical lens having an aperture and a filter, characterized in that: It also includes a six-piece telephoto lens composed of first to sixth lenses, wherein the first to sixth lenses are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has positive refractive power, and the object surface of the lens is convex; the second lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the third lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the fourth lens has negative refractive power, the object surface of the lens is convex, and the image surface is concave; the fifth lens has negative refractive power, and the object surface at the near axis is concave; the sixth lens has positive refractive power; The above optical lens satisfies the following formula: d34 / d45<2.5 7.73≤(cra-cra80%) / (IMA-IMA80%) < 13 Wherein, d34 is the air distance from the center of the image plane of the third lens to the center of the object plane of the fourth lens along the optical axis, d45 is the air distance from the center of the image plane of the fourth lens to the center of the object plane of the fifth lens along the optical axis, cra is the angle between the chief ray of the most edge light beam and the image plane, IMA is the image height of the lens, cra80% is the angle between the chief ray of the light beam converging at 80% of the image height and the image plane, and IMA80% is 80% of the image height of the lens; The object side and image side surfaces of the first to sixth lenses are aspherical, and the filter is arranged on the image side of the sixth lens.

2. The optical lens according to claim 1, characterized in that The following relationship is also satisfied: R1 / F1<0.6 Wherein, R1 is the radius of curvature of the object side surface of the first lens, and F1 is the focal length of the first lens.

3. The optical lens according to claim 1, characterized in that The following relationship is also satisfied: F1 / F13< 0.65 -1.24≥F2 / F13 >-4 Among them, F1 is the focal length of the first lens, F13 is the overall focal length of the optical system formed by the first to third lenses; F2 is the focal length of the second lens.

4. The optical lens according to claim 1, characterized in that The following relationship is also satisfied: 0.9 < CT4 / CT5 < 1.1 0.5<|F4 / F5|< 0.9 Among them, CT4 is the thickness of the fourth lens along the optical axis, CT5 is the thickness of the fifth lens along the optical axis; F4 is the focal length of the fourth lens, and F5 is the focal length of the fifth lens.

5. The optical lens according to claim 1, characterized in that The following relationship is also satisfied: (R5-R6) / (R5+R6)> 0.15 Among them, R5 is the curvature radius of the object-side surface of the third lens; R6 is the curvature radius of the object-side surface of the third lens.

6. The optical lens according to claim 1, characterized in that: The aspheric coefficients satisfy the following equation: Z = cy 2 / [1+ {1-(1+k)c 2 and 2 } 1 / 2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 + A12y 12 + A14y 14 + A16y 16 Among them, Z is the aspheric surface sag, 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, and A16 is the 16th aspheric surface coefficient.

7. The optical lens according to claim 1, characterized in that: The aperture is arranged between the second and third lenses.

8. The optical lens according to claim 1, characterized in that: The aperture is arranged on the object side of the first lens.

Images