Optical system for visual recognition of high-pixel machine and camera module applied by optical system

Abstract

The utility model provides an optical system for high-pixel machine vision identification and a camera module applying the same, which mainly comprise seven lenses, and effectively meet the design requirements of ultra-wide angle and miniaturization of the optical system through reasonable matching of lens shapes and focal power. The high-pixel optical system for machine vision recognition has the advantages of high pixel, strong resolution and ultra-wide angle design, is compact in structure and convenient to process and mount, and further improves the imaging effect of equipment matched with the system.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and particularly to an optical system and a camera module for machine vision recognition. Background Art

[0002] Motion sensing games are popular in European and American countries and have gradually spread to Asian and European countries. New-style motion sensing games can simulate three-dimensional scenes and control the actions of characters in the game through the player's own body movements, allowing players to fully immerse themselves in the game and enjoy a green and healthy gaming experience. Due to their wide range of target audiences, they have broad market development prospects. The camera lens, as a core component of motion sensing game devices, also has broad development prospects. Therefore, how to provide a high-performance system with high pixel, ultra-wide angle, and miniaturization has become the goal pursued by everyone. Summary of the Utility Model

[0003] This application aims to provide an optical system and a camera module for machine vision recognition with high pixel, ultra-wide angle, and miniaturization.

[0004] An optical system for high-pixel machine vision recognition is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane;

[0005] The first lens has a negative focal power, its object side is convex, and its image side is concave;

[0006] The second lens has a negative focal power, its object side is convex, and its image side is concave;

[0007] The third lens has a negative focal power, and its image side is convex;

[0008] The fourth lens has a positive focal power, and its object side is convex;

[0009] The fifth lens has a positive focal power, its object side is convex, and its image side is convex;

[0010] The sixth lens has a negative focal power, its object side is concave, and its image side is concave;

[0011] The seventh lens has a positive focal power, and its object side is convex;

[0012] The fifth lens and the sixth lens form a cemented lens.

[0013] Preferably, the optical system satisfies the following conditions:

[0014] -10.03 mm < f1 < -4.61 mm;

[0015] -12.21 mm < f2 < -4.52 mm;

[0016] 3.85 mm < f4 < 8.26 mm;

[0017] 1.63 mm < f5 < 4.82 mm;

[0018] -3.58 mm < f6 < -1.32 mm;

[0019] 4.29 mm < f7;

[0020] Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0021] Preferably, the optical system satisfies the following conditions:

[0022] -6.47 < f1 / f < -2.97;

[0023] -7.88 < f2 / f < -2.92;

[0024] 2.48 < f4 / f < 5.33;

[0025] 1.05 < f5 / f < 3.11;

[0026] -2.31 < f6 / f < -0.85;

[0027] 2.77 < f7 / f;

[0028] Among them, f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0029] Preferably, the optical system satisfies the following conditions: D1 / (Fno * Ymax) < 2.8; where D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0030] Preferably, the optical system satisfies the following conditions: -1.4 < f5 / f6 < -0.8, 1.78 < Vd5 / Vd6 < 3.16; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

[0031] Preferably, the optical system satisfies the following conditions: 0.35 < f1 / f2 < 1.00; where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

[0032] Preferably, the optical system satisfies the following conditions: Nd1 > 1.80, Vd1 < 56; Nd2 < 1.60, Vd2 > 45; Nd4 > 1.60, Vd4 < 65; Nd6 > 1.60, Vd6 < 45; where Nd1 is the refractive index of the first lens material, Vd1 is the Abbe number of the first lens material, Nd2 is the refractive index of the second lens material, Vd2 is the Abbe number of the second lens material, Nd4 is the refractive index of the fourth lens material, Vd4 is the Abbe number of the fourth lens material, and Nd6 is the refractive index of the sixth lens material, Vd6 is the Abbe number of the sixth lens material.

[0033] Preferably, the full field of view angle FOV of the optical system ∈ [160°, 200°], and the total length of the optical system TTL ≤ 16.5 mm.

[0034] Preferably, the first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are aspherical lenses.

[0035] On the other hand, an embodiment of the present application further provides an imaging module, which at least includes an optical lens, and the above-mentioned optical system for high-pixel machine vision recognition is installed in the optical lens.

[0036] Compared with the prior art, the beneficial effects of the present application are as follows:

[0037] The present utility model provides an optical system for high-pixel machine vision recognition and an imaging module using the same, which mainly consists of seven lenses. Through the reasonable matching of the lens shapes and optical powers, the design requirements of ultra-wide angle and miniaturization of the optical system are effectively met. The optical system for high-pixel machine vision recognition configured in the present application has the advantages of high pixels, strong resolution, and ultra-wide angle design, with a compact structure, facilitating processing and installation, and further improving the imaging effect of the equipment equipped with this system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments.

[0039] Figure 1 It is a schematic structural diagram of the optical system or the imaging module in Embodiment 1 of the present application;

[0040] Figure 2 It is the field curvature curve and distortion curve of the optical system or the imaging module in Embodiment 1 of the present application;

[0041] Figure 3 is a schematic structural diagram of the optical system or camera module according to Embodiment 2 of the present application;

[0042] Figure 4 are the field curvature curve and distortion curve of the optical system or camera module according to Embodiment 2 of the present application;

[0043] Figure 5 is a schematic structural diagram of the optical system or camera module according to Embodiment 3 of the present application;

[0044] Figure 6 are the field curvature curve and distortion curve of the optical system or camera module according to Embodiment 3 of the present application. Detailed implementation manners

[0045] As Figure 1-6 shown, the present application provides an optical system for high-pixel machine vision recognition. An optical system for high-pixel machine vision recognition sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens along the optical axis from the object plane to the image plane;

[0046] The first lens has a negative optical power, its object side is convex, and its image side is concave;

[0047] The second lens has a negative optical power, its object side is convex, and its image side is concave;

[0048] The third lens has a negative optical power, and its image side is convex;

[0049] The fourth lens has a positive optical power, and its object side is convex;

[0050] The fifth lens has a positive optical power, its object side is convex, and its image side is convex;

[0051] The sixth lens has a negative optical power, its object side is concave, and its image side is concave;

[0052] The fifth lens and the sixth lens form a cemented lens;

[0053] The seventh lens has a positive optical power, and its object side is convex;

[0054] The first lens and the fourth lens are spherical lenses, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are aspherical lenses, the fifth and sixth lenses form a cemented lens, and the remaining lenses are separated by air intervals.

[0055] The optical system of the embodiment of the present application mainly consists of seven lenses. Through the reasonable combination of the lens shapes and optical powers, it effectively meets the design requirements of ultra-wide angle and miniaturization of the optical system. The optical system for high-pixel machine vision recognition configured in the present application has the advantages of high pixels, strong resolution, and ultra-wide angle design. It has a compact structure, is convenient for processing and installation, and further improves the imaging effect of the equipment equipped with this system.

[0056] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following relationship: FOV ∈ [160°, 200°], where FOV is the maximum field of view angle of the optical system. The design of the large field of view angle of the optical system effectively meets the actual needs of the ultra-wide angle of the optical system.

[0057] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following relationship: D1 / (Fno * Ymax) < 2.8, where D1 is the maximum optical effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. The limitation of the maximum image circle and aperture size of the optical imaging system can achieve the purpose of limiting the optical effective diameter of the first lens, and thus ensure the miniaturization requirements of the optical system.

[0058] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following relationships: (1) -10.03 mm < f1 < -4.61 mm; (2) -12.21 mm < f2 < -4.52 mm; (3) 3.85 mm < f4 < 8.26 mm; (4) 1.63 mm < f5 < 4.82 mm; (5) -3.58 mm < f6 < -1.32 mm; (6) 4.29 mm < f7; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. By reasonably controlling the effective focal lengths of the lenses of the optical system, the optical system can meet the large field of view angle while restricting the effective diameter of the components, controlling the size of the overall optical system, and adjusting the light incident angle, which is beneficial to correcting the system aberration.

[0059] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following relationships: (1) -6.47 mm < f1 / f < -2.97 mm; (2) -7.88 mm < f2 / f < -2.92 mm;

[0060] (3) 2.48mm < f4 / f < 5.33mm; (4) 1.05mm < f5 / f < 3.11mm; (5) -2.31mm < f6 / f < -0.85mm; (6) 2.77mm < f7 / f; where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0061] Effect: The limitation of the ratio of the effective focal length of each lens to the effective focal length of the optical system enables the optical system to obtain a reasonable light deflection angle, effectively reduces the sensitivity of component tolerances, and improves system aberrations.

[0062] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the fourth lens is a glass lens, and the material satisfies: Nd4 > 1.60, Vd4 < 65; where Nd4 is the refractive index of the fourth lens material and Vd4 is the Abbe number of the fourth lens material. By selecting the fourth lens as a glass lens, the light power distribution of the overall optical system can be effectively balanced to meet the system temperature performance requirements. At the same time, by reasonably matching the Abbe numbers of the materials, the axial chromatic aberration and lateral chromatic aberration of the system can be further reduced, improving the imaging quality of the system.

[0063] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following relationship: -1.4 < f5 / f6 < -0.8; 1.78 < Vd5 / Vd6 < 3.16; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens. Through the reasonable light power distribution of the fifth and sixth lenses, the appropriate temperature compensation amount of the overall optical system can be effectively controlled; with a reasonable combination of Abbe numbers and control of the bonding process, the axial chromatic aberration and lateral chromatic aberration of the system can be effectively reduced, further improving the imaging quality of the system.

[0064] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following relationship: Nd1 > 1.80, Vd1 < 56, Nd2 < 1.60, Vd2 > 45, Nd6 > 1.60, Vd6 < 45; where Nd1 is the refractive index of the first lens material, Vd1 is the Abbe number of the first lens material, Nd2 is the refractive index of the second lens material, Vd2 is the Abbe number of the second lens material, Nd6 is the refractive index of the sixth lens material, and Vd6 is the Abbe number of the sixth lens material. By using the first high-refractive-index material, it helps to further reduce the outer diameter of the component and meet the customer's small-size requirements. The selection of the second and sixth plastic materials can effectively improve the overall chromatic aberration of the system and enhance the imaging performance of the system.

[0065] Furthermore, as a preferred embodiment rather than a limitation of the present utility model, the optical system satisfies the following relationship: 0.35 < f1 / f2 < 1.00; where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. By controlling the ratio of the effective focal lengths of the first lens and the second lens of the optical system, on the one hand, it is beneficial to control the incident light height of the light beam entering the optical system to reduce the high-order aberration of the optical system and the outer diameter of the first lens; on the other hand, while controlling the cost, the use of an aspherical surface in combination with the second lens can better correct the distortion of the system and reduce the astigmatism to meet the customer's requirements for pixel density.

[0066] Example 1

[0067] The following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 Fig. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application.

[0068] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0069] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S10 is convex, and its image side surface S11 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is concave, and its image side surface S12 is concave. The seventh lens E7 has a positive optical power, its object side surface S13 is convex, and its image side surface S14 is convex. The filter E9 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0070] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Example 1, where the units of the curvature radius and thickness are both millimeters (mm).

[0071] Table 1

[0072]

[0073] In Table 1, for any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, and the seventh lens E78, both the object side surface and the image side surface are aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0074]

[0075] Where x is the distance from a corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface profile formula. Table 2 gives the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 for the respective aspherical surfaces that can be used in the first embodiment.

[0076] Table 2

[0077]

[0078] Embodiment 2

[0079] The following refers to Figures 3 to 4 to describe the optical imaging lens according to Embodiment 2 of the present application. Figure 3 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application.

[0080] As Figure 3 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0081] The first lens has a negative optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a negative optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface. The third lens E3 has a negative optical power. Its object side surface S5 is a concave surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a positive optical power. Its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power. Its object side surface S10 is a convex surface, and its image side surface S11 is a convex surface. The sixth lens E6 has a negative optical power. Its object side surface S11 is a concave surface, and its image side surface S12 is a concave surface. The seventh lens E7 has a positive optical power. Its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The filter E9 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0082] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens of the optical imaging lens according to Embodiment 2, where the units of the radius of curvature and thickness are both millimeters (mm).

[0083] Table 3

[0084]

[0085] In Table 3, for any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, and the seventh lens E7, both the object side and the image side are aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0086]

[0087] where x is the distance from a corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface profile formula. Table 4 gives the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 for each of the aspherical surfaces that can be used in the second embodiment.

[0088] Table 4

[0089]

[0090] Embodiment Three

[0091] The following refers to Figures 5 to 6 Describe the optical imaging lens according to Embodiment 3 of the present application. Figure 5 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application.

[0092] As Figure 5 shown, the optical imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0093] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S12 is concave, and its image side S13 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0094] Table 5 shows the surface types, radii of curvature, thicknesses, and materials of the lenses of the optical imaging lens of Embodiment 3. Among them, the units of the radius of curvature and the thickness are both millimeters (mm).

[0095] Table 5

[0096]

[0097] In Table 5, for any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8, both the object side and the image side are aspherical surfaces. The surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0098]

[0099] Among them, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface profile formula. Table 6 gives the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces that can be used in the third embodiment.

[0100] Table 6

[0101]

[0102] In Embodiments 1-3, the basic data are as follows:

[0103] Table 7

[0104]

[0105] In Embodiments 1-3, each conditional expression satisfies the conditions in the following table:

[0106] Table 8

[0107]

[0108] An imaging module includes at least an optical lens, and the above optical system is installed in the optical lens. The optical system for high-pixel machine vision recognition configured in this application has the advantages of high pixels, strong resolution, and ultra-wide-angle design, with a compact structure, which is convenient for processing and installation, and further improves the imaging effect of the equipment equipped with this system.

[0109] As described above, one or more implementation manners are provided in combination with specific contents, and it is not determined that the specific implementation of the present utility model is only limited to these descriptions. Any method, structure, etc. that is similar or identical to the present utility model, or any technical deduction or replacement made on the premise of the concept of the present utility model, should be regarded as the protection scope of the present utility model.

Claims

1. An optical system for high-pixel machine vision recognition, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object plane to the image plane along the optical axis, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, its object side surface is convex, and its image side surface is concave; The third lens has negative optical power, and its image side surface is convex; The fourth lens has positive refractive power, and its object side surface is convex; The fifth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The sixth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The seventh lens has positive refractive power, and its object side surface is convex; The fifth lens and the sixth lens constitute a cemented lens.

2. The high-pixel machine vision recognition optical system according to claim 1, characterized in that: The optical system meets the following conditions: -10.03mm < f1 < -4.61mm; -12.21mm < f2 < -4.52mm; 3.85mm < f4 < 8.26mm; 1.63mm < f5 < 4.82mm; -3.58mm < f6 < -1.32mm; 4.29mm < f7; Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

3. The high-pixel machine vision recognition optical system according to claim 1, characterized in that: The optical system meets the following conditions: -6.47 < f1 / f < -2.97; -7.88 < f2 / f < -2.92; 2.48 < f4 / f < 5.33; 1.05 < f5 / f < 3.11; -2.31 < f6 / f < -0.85; 2.77 <f7 / f ; Wherein, f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

4. The high-pixel machine vision recognition optical system according to any one of claims 1 to 3, characterized in that: The optical system meets the following conditions: D1 / (Fno*Ymax) < 2.8; Wherein, D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

5. The high-pixel machine vision recognition optical system according to claim 1, characterized in that: The optical system meets the following conditions: -1.4 < f5 / f6 < -0.8, 1.78 < Vd5 / Vd6< 3.16; Wherein, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

6. The high-pixel machine vision recognition optical system according to any one of claims 1 to 3, characterized in that: The optical system meets the following conditions: 0.35 < f1 / f2 < 1.00; Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

7. The high-pixel machine vision recognition optical system according to any one of claims 1 to 3, characterized in that: The optical system meets the following conditions: Nd1 > 1.80, Vd1 < 56; and / or Nd2<1.60,Vd2>45; and / or The fourth lens is a glass lens, Nd4>1.60, Vd4<65; and / or Nd6>1.60,Vd6<45; Wherein, Nd1 is the refractive index of the first lens material, Vd1 is the Abbe number of the first lens material, Nd2 is the refractive index of the second lens material, Vd2 is the Abbe number of the second lens material, Nd4 is the refractive index of the fourth lens material, Vd4 is the Abbe number of the fourth lens material, Nd6 is the refractive index of the sixth lens material, and Vd6 is the Abbe number of the sixth lens material.

8. The high-pixel machine vision recognition optical system according to any one of claims 1 to 3, characterized in that: The full field of view FOV∈[160°,200°] of the optical system, and the total length TTL of the optical system ≤16.5 mm.

9. The high-pixel machine vision recognition optical system according to any one of claims 1 to 3, characterized in that: The first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are aspherical lenses; and / or The aperture stop of the optical system is located between the fourth lens and the fifth lens.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with an optical system for high-pixel machine vision recognition as described in any one of claims 1 to 9.

Images