Large-aperture high-resolution optical imaging lens

Abstract

The utility model relates to the technical field of optical lenses, in particular to a large-aperture high-resolution optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis. The object side surface is a convex surface, and the image side surface is a concave surface; the second lens has negative focal power; the object side surface is a convex surface, and the image side surface is a concave surface; the third lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens has focal power, and the object side surface is a convex surface; the fifth lens has negative focal power; the sixth lens has positive focal power; the image side surface has at least one inflection point in the off-axis range; the seventh lens has negative focal power; the first to seventh lenses are all plastic aspheric lenses; the conditional expression is satisfied: 1.49 lt; fNOlt, FNOlt; 1.901, 1.901; and the FNO is the aperture size of the optical lens. The lens is ensured to have a large aperture and high imaging quality.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to an optical imaging lens with a large aperture and high resolution. Background Art

[0002] In recent years, with the rise of portable electronic products with camera functions, the market has higher requirements for the imaging quality of electronic devices. When shooting close-ups or portraits, the optical lenses of handheld devices have problems such as low light transmittance and poor stability, making it difficult to meet the product's stringent requirements for high resolution. In order to meet the development trend of electronic devices towards long focal length, large aperture and high image quality, it is urgent to develop an optical lens with both large aperture and high imaging quality. Utility Model Content

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an optical imaging lens with large aperture and high resolution, which is mainly composed of seven lenses, and the seven lenses all adopt a plastic aspherical design. Through the reasonable design of the optical focal length and surface shape of the first lens to the seventh lens, and the reasonable distribution of the spacing and thickness of each lens, it is ensured that the lens has both a large aperture and a high imaging quality.

[0004] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0005] An optical imaging lens with a large aperture and high resolution, which is composed of the following components from the object side to the image side along the optical axis:

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

[0009] A fourth lens has optical power, and an object side surface of the fourth lens is convex near the optical axis;

[0010] a fifth lens having negative optical power;

[0011] A sixth lens element has positive refractive power; the image side surface of the sixth lens element has at least one inflection point in the off-axis range;

[0012] A seventh lens having negative optical power;

[0013] The first to seventh lenses are all plastic aspherical lenses;

[0014] The optical lens satisfies the following conditional formula:

[0015] 1.49 <FNO<1.901

[0016] Wherein, FNO is the aperture size of the optical lens.

[0017] By rationally designing the focal length and surface shape of the first to seventh lenses and controlling the aperture value, it is ensured that the lens has a large aperture and high imaging quality.

[0018] Furthermore, the lens satisfies the following conditional formula:

[0019] 83.4 <FOV<86.1

[0020] Wherein, FOV is the maximum field of view of the optical lens.

[0021] By satisfying the above conditional expression, it is shown that the lens has a large viewing range.

[0022] Furthermore, the lens satisfies the following conditional formula:

[0023] 7.77 <TTL / BFL<9.44

[0024] Among them, TTL is the total optical length from the object side of the first lens of the optical lens to the image plane, and BFL is the distance from the maximum effective radius position of the image side of the seventh lens of the optical lens to the image plane.

[0025] By satisfying the above conditional expression to constrain the proportion of the total lens length to the optical back focus of the lens, a longer back focus is conducive to the movement range of the motor focus in the structure.

[0026] Furthermore, the lens satisfies the following conditional formula:

[0027] 1.2 <EFL / F6<1.41

[0028] Wherein, EFL is the focal length of the optical lens, and F6 is the focal length of the sixth lens.

[0029] By satisfying the above conditional expression to constrain the refractive power of the sixth lens, the imaging quality is improved. Exceeding the upper or lower limit will be unfavorable for the system to correct aberrations and it is difficult to improve the resolution of the system. In addition, the size of the lens is effectively reduced, the sensitivity of the lens is reduced, and the processability of the lens is improved, making the lens more conducive to production and processing and applicable to portable electronic products.

[0030] Furthermore, the lens satisfies the following conditional formula:

[0031] 3 <CT1 / CT2<4.9

[0032] Wherein, CT1 is the center thickness of the first lens of the optical lens, and CT2 is the center thickness of the second lens of the optical lens.

[0033] Meeting the above conditions is beneficial to improving the performance of the optical lens, reducing the impact of aberrations, and further reducing the F number while ensuring optical performance.

[0034] The beneficial effects of the utility model are:

[0035] The utility model provides an optical imaging lens with large aperture and high resolution, which is mainly composed of seven lenses, and the seven lenses are all designed with plastic aspherical surfaces. Through the reasonable design of the optical focal length and surface shape of the first lens to the seventh lens, and the reasonable distribution of the spacing and thickness of each lens, it is ensured that the lens has both large aperture and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0037] Figure 2 is an astigmatism curve diagram of Example 1 of the utility model;

[0038] Figure 3 This is a distortion curve diagram of Example 1 of the utility model;

[0039] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0040] Figure 5 is an astigmatism curve diagram of Example 2 of the utility model;

[0041] Figure 6 This is a distortion curve diagram of Example 2 of the utility model;

[0042] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0043] Figure 8 is an astigmatism curve diagram of Example 3 of the utility model;

[0044] Fig. 9 This is a distortion curve diagram of Example 3 of the utility model;

[0045] Fig.10 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0046] Fig.11 is an astigmatism curve diagram of Example 4 of the utility model;

[0047] Fig.12 This is a distortion curve diagram of Example 4 of the utility model;

[0048] Fig.13 This is a schematic diagram of the structure of Embodiment 5 of the present utility model;

[0049] Fig.14 is an astigmatism curve diagram of Example 5 of the utility model;

[0050] Fig.15 This is a distortion curve diagram of Example 5 of the present utility model.

[0051] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, aperture; 9, filter. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The embodiment of the utility model provides an optical imaging lens with a large aperture and high resolution, which is composed of the following components from the object side to the image side along the optical axis:

[0056] The first lens 1 has positive power; the object side surface of the first lens 1 is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0057] 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;

[0058] The third lens 3 has negative power, the object side surface of the third lens 3 is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0059] The fourth lens 4 has optical power, and the object side surface of the fourth lens 4 is convex near the optical axis;

[0060] A fifth lens 5 having negative optical power;

[0061] The sixth lens element 6 has positive refractive power; the image side surface of the sixth lens element 6 has at least one inflection point in the off-axis range;

[0062] A seventh lens element 7 having negative optical power;

[0063] The first lens 1 to the seventh lens 7 are all plastic aspherical lenses;

[0064] The optical lens satisfies the following conditional formula:

[0065] 1.49 <FNO<1.901

[0066] Wherein, FNO is the aperture size of the optical lens.

[0067] By rationally designing the focal length and surface shape of the first lens 1 to the seventh lens 7 and controlling the aperture value, it is ensured that the lens has a large aperture and a high imaging quality.

[0068] Specifically, the lens satisfies the following conditional formula:

[0069] 83.4 <FOV<86.1

[0070] Wherein, FOV is the maximum field of view of the optical lens.

[0071] By satisfying the above conditional expression, it is shown that the lens has a large viewing range.

[0072] Specifically, the lens satisfies the following conditional formula:

[0073] 7.77 <TTL / BFL<9.44

[0074] Wherein, TTL is the total optical length from the object side of the first lens 1 of the optical lens to the image plane, and BFL is the distance from the maximum effective radius position of the image side of the seventh lens 7 of the optical lens to the image plane.

[0075] By satisfying the above conditional expression to constrain the proportion of the total lens length to the optical back focus of the lens, a longer back focus is conducive to the movement range of the motor focus in the structure.

[0076] Specifically, the lens satisfies the following conditional formula:

[0077] 1.2 <EFL / F6<1.41

[0078] Among them, EFL is the focal length of the optical lens, and F6 is the focal length of the sixth lens 6.

[0079] By satisfying the above-mentioned conditional formula to constrain the refractive power of the sixth lens 6, the imaging quality is improved. Exceeding the upper or lower limit will be unfavorable for the system to correct aberrations and it is difficult to improve the resolution of the system. In addition, the size of the lens is effectively reduced, the sensitivity of the lens is reduced, and the processability of the lens is improved, making the lens more conducive to production and processing and suitable for portable electronic products.

[0080] Specifically, the lens satisfies the following conditional formula:

[0081] 3 <CT1 / CT2<4.9

[0082] Wherein, CT1 is the center thickness of the first lens 1 of the optical lens, and CT2 is the center thickness of the second lens 2 of the optical lens.

[0083] By meeting the above conditions, it is beneficial to improve the performance of the optical lens, reduce the influence of aberrations, and specifically reduce the F number while ensuring the optical performance.

[0084] The above-mentioned lens may further include a filter 7 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 7 or the protective glass may not be used.

[0085] 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.

[0086] Example 1

[0087] The present embodiment provides a large aperture and high resolution optical imaging lens, which is composed of an aperture 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9 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. The first lens 1 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The second lens 2 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The third lens 3 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fourth lens 4 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is convex. The fifth lens 5 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The sixth lens 6 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The seventh lens 7 has negative focal power, and its object side surface in the paraxial region is concave, and its image side surface is concave. The filter 9 is arranged between the seventh lens 7 and the image plane.

[0088] 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).

[0089] Table 1 is a table of lens parameters of the lens of Example 1.

[0090]

[0091]

[0092] In this embodiment, the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0093]

[0094] 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, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S14 in Example 1.

[0095] Table 2 is a table of high-order coefficients of various aspherical mirror surfaces in Example 1.

[0096]

[0097]

[0098] Table 3 below shows important parameters in Example 1.

[0099] Table 3 is a table of important parameters of Example 1.

[0100]

[0101] The specific lens structure of this embodiment is as follows Figure 1 As shown in Table 1-3 and Figure 1-3 The lens shape and various properties of the lens of the current embodiment are shown, which shows that the lens has both a large aperture and high imaging quality.

[0102] Example 2

[0103] The present embodiment provides a large aperture and high resolution optical imaging lens, which is composed of an aperture 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9 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. The first lens 1 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The second lens 2 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The third lens 3 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fourth lens 4 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fifth lens 5 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The sixth lens 6 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The seventh lens 7 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The filter 9 is arranged between the seventh lens 7 and the image plane.

[0104] 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).

[0105] Table 4 is a table of lens parameters of Example 2.

[0106]

[0107] In this embodiment, the surface type of each aspherical surface can be defined by the formula (1) in the above embodiment 1. Table 5 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror surface S1-S14 that can be used in embodiment 2.

[0108] Table 5 is a table of high-order coefficients of each aspherical mirror surface in Example 2.

[0109]

[0110] Table 6 below shows important parameters in Example 2.

[0111] Table 6 is a table of important parameters of Example 2.

[0112]

[0113]

[0114] The specific lens structure of this embodiment is as follows Figure 4 Table 4-6 and Figure 4-6The lens shape and various properties of the lens of the current embodiment are shown, which shows that the lens has both a large aperture and high imaging quality.

[0115] Example 3

[0116] The present embodiment provides a large aperture and high resolution optical imaging lens, which is composed of an aperture 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9 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. The first lens 1 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The second lens 2 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The third lens 3 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fourth lens 4 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fifth lens 5 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The sixth lens 6 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The seventh lens 7 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The filter 9 is arranged between the seventh lens 7 and the image plane.

[0117] 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).

[0118] Table 7 is a table of lens parameters of Example 3.

[0119]

[0120]

[0121] In this embodiment, the surface shape of each aspheric surface can be defined by the formula (1) in the above-mentioned embodiment 1.

[0122] Table 8 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S14 that can be used in Example 3.

[0123] Table 8 is a table of high-order coefficients of each aspherical mirror surface in Example 3.

[0124]

[0125]

[0126] Table 9 below shows important parameters in Example 3.

[0127] Table 9 is a table of important parameters of Example 3.

[0128]

[0129] The specific lens structure of this embodiment is as follows Figure 7 Table 7-9 and Figure 7-9 The lens shape and various properties of the lens of the current embodiment are shown, which shows that the lens has both a large aperture and high imaging quality.

[0130] Example 4

[0131] The present embodiment provides a large aperture and high resolution optical imaging lens, which is composed of an aperture 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9 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. The first lens 1 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The second lens 2 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The third lens 3 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fourth lens 4 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fifth lens 5 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The sixth lens 6 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The seventh lens 7 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The filter 9 is arranged between the seventh lens 7 and the image plane.

[0132] 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).

[0133] Table 10 is a table of lens parameters of Example 4.

[0134]

[0135] In this embodiment, the surface shape of each aspheric surface can be defined by the formula (1) in the above-mentioned embodiment 1.

[0136] Table 11 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S14 that can be used in Example 4.

[0137] Table 11 is a table of high-order coefficients of each aspherical mirror surface in Example 4.

[0138]

[0139]

[0140] Table 12 below shows important parameters in Example 4.

[0141] Table 12 is a table of important parameters of Example 4.

[0142]

[0143] The specific lens structure of this embodiment is as follows Fig.10 Table 10-12 and Figure 10-12 The lens shape and various properties of the lens of the current embodiment are shown, which shows that the lens has both a large aperture and high imaging quality.

[0144] Example 5

[0145] The present embodiment provides a large aperture and high resolution optical imaging lens, which is composed of an aperture 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9 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. The first lens 1 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The second lens 2 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The third lens 3 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The fourth lens 4 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is convex. The fifth lens 5 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The sixth lens 6 has positive focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The seventh lens 7 has negative focal power, and its object side surface in the paraxial region is convex, and its image side surface is concave. The filter 9 is arranged between the seventh lens 7 and the image plane.

[0146] Table 13 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).

[0147] Table 13 is a table of lens parameters of Example 5.

[0148]

[0149] In this embodiment, the surface shape of each aspheric surface can be defined by the formula (1) in the above-mentioned embodiment 1.

[0150] Table 14 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S14 that can be used in Example 5.

[0151] Table 14 is a table of high-order coefficients of each aspherical mirror surface in Example 5.

[0152]

[0153]

[0154] Table 15 below shows important parameters in Example 5.

[0155] Table 15 is a table of important parameters of Example 5.

[0156]

[0157] The specific lens structure of this embodiment is as follows Fig.13 Table 13-15 and Figure 13-15 The lens shape and various properties of the lens of the current embodiment are shown, which shows that the lens has both a large aperture and high imaging quality.

[0158] 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 with large aperture and high resolution, characterized in that: Along the optical axis from the object side to the image side, it is composed of: The first lens has positive power; the object side surface of the first lens is convex at the near optical axis, and the image side surface 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 a negative optical power, the object side surface of the third lens is convex at the near optical axis, and the image side surface is concave at the near optical axis; A fourth lens has optical power, and an object side surface of the fourth lens is convex near the optical axis; a fifth lens having negative optical power; a sixth lens having positive refractive power; The image side surface of the sixth lens has at least one inflection point in the off-axis range; A seventh lens having negative optical power; The first to seventh lenses are all plastic aspherical lenses; The optical lens meets the following conditions: 1.49 < FNO < 1.901 Wherein, FNO is the aperture size of the optical lens.

2. The optical imaging lens with large aperture and high resolution as claimed in claim 1, characterized in that: The lens satisfies the following conditional formula: 83.4 < FOV < 86.1 Wherein, FOV is the maximum field of view of the optical lens.

3. The optical imaging lens with large aperture and high resolution as claimed in claim 1, characterized in that: The lens satisfies the following conditional formula: 7.77 < TTL / BFL < 9.44 Among them, TTL is the total optical length from the object side of the first lens of the optical lens to the image plane, and BFL is the distance from the maximum effective radius position of the image side of the seventh lens of the optical lens to the image plane.

4. The optical imaging lens with large aperture and high resolution as claimed in claim 1, characterized in that: The lens satisfies the following conditional formula: 1.2 < EFL / F6 < 1.41 Wherein, EFL is the focal length of the optical lens, and F6 is the focal length of the sixth lens.

5. The optical imaging lens with large aperture and high resolution as claimed in claim 1, characterized in that: The lens satisfies the following conditional formula: 3 < CT1 / CT2 < 4.9 Wherein, CT1 is the center thickness of the first lens of the optical lens, and CT2 is the center thickness of the second lens of the optical lens.

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