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

Abstract

The invention provides an optical system for high-pixel machine vision recognition and a camera module applying the same, mainly comprising seven lenses, the first lens having negative focal power, a convex object-side surface and a concave image-side surface, the second lens having negative focal power, a convex object-side surface and a concave image-side surface, the third lens having negative focal power, a convex object-side surface and a concave image-side surface, and the fourth lens having negative focal power, a convex object-side surface and a concave image-side surface. The third lens has positive focal power, the image side surface is a convex surface and the image side surface is a concave surface; the fourth lens has positive focal power, the object side surface is a convex surface and the image side surface is a convex surface; the fifth lens has positive focal power, the object side surface is a convex surface and the image side surface is a convex surface; the sixth lens has negative focal power, the object side surface is a concave surface and the image side surface is a concave surface; the fifth lens and the sixth lens form a bonding lens, the seventh lens has positive focal power, the object side face is a convex face, the image side face is a convex face, the advantages of high pixel, high resolution and ultra-wide angle design are achieved, the structure is compact, machining and installation are convenient, and the imaging effect of equipment matched with the system is further improved.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and particularly to an optical system for high-pixel machine vision recognition and an imaging module using the same. Background Art

[0002] New-style somatosensory games can simulate three-dimensional scenes, control the actions of characters in the game through the player's own body movements, enable players to fully immerse themselves in the game, and enjoy green and healthy games. Due to the wide range of the target audience, they have broad market development prospects. As the core component of somatosensory game devices, camera lenses also have broad development prospects. How to provide a high-performance lens with ultra-wide angle and miniaturization has become the goal pursued by everyone. Summary of the Invention

[0003] The present application aims to provide an optical system for high-pixel machine vision recognition with a design featuring high pixels, strong resolution, and ultra-wide angle.

[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 fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane; The first lens has a negative optical power, its object side is convex, and its image side is concave; The second lens has a negative optical power, its object side is convex, and its image side is concave; The third lens has a positive optical power, its object side is convex, and its image side is concave; The fourth lens has a positive optical power, its object side is convex, and its image side is convex; The fifth lens has a positive optical power, its object side is convex, and its image side is convex; The sixth lens has a negative optical power, its object side is concave, and its image side is concave; The fifth lens and the sixth lens form a cemented lens; The seventh lens has a positive optical power, its object side is convex, and its image side is convex.

[0005] Furthermore, the lenses of the optical system satisfy the following conditions: -4.03mm < f1 < 1.61mm; -12.21mm < f2 < -8.52mm; 9.85mm < f3 < 13.26mm; 3.31mm < f4 < 5.34mm; 7.45mm < f5 < 10.00mm; -2.29mm < f6 < -6mm; 3.89mm < f7; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third 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.

[0006] Furthermore, the lenses of the optical system satisfy the following conditions: -3.015 < f1 / f < 2.305; -6.105 < f2 / f < -2.26; 4.925 < f3 / f < 6.63; 1.655 < f4 / f < 2.67; 3.725 < f5 / f < 5.00; -1.145 < f6 / f < -3.00; 1.84 < 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, f3 is the effective focal length of the third 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.

[0007] Furthermore, the optical system satisfies the following condition: 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.

[0008] Furthermore, the fourth lens is a glass lens, and the material satisfies: Nd4 > 1.70, Vd4 < 52.40; Where Nd4 is the refractive index of the material of the fourth lens and Vd4 is the Abbe number of the material of the fourth lens.

[0009] Furthermore, the optical system satisfies the following relationship: -1.4 < f5 / f6 < -9.0; 1.78 < Vd5 / Vd6 < 3.15; 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.

[0010] Furthermore, the optical system satisfies the following relationship: Nd1 > 1.69, Vd1 < 60, Nd2 < 1.60, Vd2 > 50, Nd6 > 1.60, Vd6 < 25; 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, Nd6 is the refractive index of the sixth lens material, and Vd6 is the Abbe number of the sixth lens material.

[0011] Further, the optical system satisfies the following condition: D1 / (Fno*Ymax) < 1.46; 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.

[0012] Further, the full field of view angle FOV of the optical system is in the range of [120°, 180°], and the total length TTL of the optical system is less than or equal to 15.50 mm.

[0013] Further, the first lens is a glass spherical lens, the second lens is a plastic aspherical lens, the third lens is a plastic aspherical lens, the fourth lens is a glass spherical lens, and the fifth, sixth, and seventh lenses are plastic aspherical lenses.

[0014] Further, the fifth lens and the sixth lens form a cemented lens, and the remaining lenses are separated by air.

[0015] Further, the aperture stop of the optical system is located between the third lens and the fourth lens.

[0016] 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.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows: The present invention provides an optical system for high-pixel machine vision recognition and an imaging module using the same, which is mainly composed of seven lenses. Through the reasonable matching of the lens shapes and optical powers, it meets the design requirements of ultra-wide angle and miniaturization of the optical system, and has the advantages of high pixels, strong resolution, and ultra-wide angle design. The structure is compact, which is convenient for processing and installation, and further improves the imaging effect of the equipment equipped with this system. Description of the Drawings

[0018] 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.

[0019] Figure 1 It is a schematic structural diagram of the optical system or the imaging module in Embodiment 1 of the present application; 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; Figure 3 It is a schematic structural diagram of the optical system or camera module in Embodiment 2 of the present application; Figure 4 It is the field curvature curve and distortion curve of the optical system or camera module in Embodiment 2 of the present application; Figure 5 It is a schematic structural diagram of the optical system or camera module in Embodiment 3 of the present application; Figure 6 It is the field curvature curve and distortion curve of the optical system or camera module in Embodiment 3 of the present application. Detailed implementation manners

[0020] As Figure 1-6 shown, the present application provides an optical system for high-pixel machine vision recognition, which includes a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side; The first lens has a negative optical power, its object side is convex, and its image side is concave; The second lens has a negative optical power, its object side is convex, and its image side is concave; The third lens has a positive optical power, its object side is convex, and its image side is concave; The fourth lens has a positive optical power, its object side is convex, and its image side is convex; The fifth lens has a positive optical power, its object side is convex, and its image side is convex; The sixth lens has a negative optical power, its object side is concave, and its image side is concave; The seventh lens has a positive optical power, its object side is convex, and its image side is convex.

[0021] The optical system of the embodiment of the present invention is mainly composed of 7 lenses. Through the reasonable matching of the lens shapes and optical powers, it meets the design requirements of ultra-wide angle and miniaturization of the optical system, has the advantages of high pixels, strong resolution, and ultra-wide angle design, is structurally compact, is convenient for processing and installation, and further improves the imaging effect of the equipment equipped with this system.

[0022] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following relationship: FOV ∈ [120°, 180°], where FOV is the maximum field of view angle of the optical system. Through the design of the large field of view angle of the optical system in the present application, the actual requirements of the ultra-wide angle of the optical system are effectively met.

[0023] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following relationship: D1 / (Fno*Ymax) < 1.46, where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the radius of the maximum image circle of the system. By limiting the maximum image circle and aperture size of the optical imaging system in this application, the requirement for miniaturization of the optical system is ensured.

[0024] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following relationships: (1) -4.03 mm < f1 < 1.61 mm; (2) -12.21 mm < f2 < -8.52 mm; (3) 9.85 mm < f3 < 13.26 mm; (4) 3.31 mm < f4 < 5.34 mm; (5) 7.45 mm < f5 < 10.00 mm; (6) -2.29 mm < f6 < -6 mm; (7) 3.89 mm < f7; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third 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 and cooperating with the reasonable setting of the diaphragm position in this application, the optical system can control the effective diameter of the components while satisfying a large field of view angle, reduce the size of the overall optical system, and adjust the light incident angle, which is beneficial to correcting the system aberration.

[0025] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following relationships: (1) -3.015 < f1 / f < 2.305; (2) -6.105 < f2 / f < -2.26; (3) 4.925 < f3 / f < 6.63; (4) 1.655 < f4 / f < 2.67; (5) 3.725 < f5 / f < 5.00; (6) -1.145 < f6 / f < -3.00; (7) 1.84 < f7 / f; where f is the focal length of the entire optical system, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third 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 limiting the ratio of the effective focal lengths of each lens to the effective focal length of the optical system in this application, the optical system can obtain a reasonable light deflection angle, effectively reduce the sensitivity of component tolerances, and improve the system aberration. At the same time, by reasonably distributing the optical power, the temperature performance requirements of the optical system are satisfied.

[0026] Further, as a preferred embodiment rather than a limitation of the present invention, the fourth lens of the optical system and the camera module is a glass lens, and the material satisfies: Nd4>1.60, Vd4<42.0; 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 power distribution of the overall optical system can be effectively balanced to meet the temperature performance requirements of the system. At the same time, by reasonably matching the Abbe number of the material, the axial chromatic aberration and lateral chromatic aberration of the system can be further reduced, improving the imaging quality of the system.

[0027] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following conditions: -1.4<f5 / f6<-9.0; 1.78<Vd5 / Vd6<3.15; where f5 is the effective focal length of the fifth lens, and 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 power distribution of the fifth and sixth lenses, the temperature compensation amount of the overall optical system can be effectively controlled. With the 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.

[0028] Further, as a preferred embodiment rather than a limitation of the present invention, the optical system satisfies the following conditions: Nd1>1.69, Vd1<60.0, Nd2<1.6, Vd2>50, Nd6>1.6, Vd6<25; where Nd1 is the refractive index of the first lens material, and Vd1 is the Abbe number of the first lens material. Nd2 is the refractive index of the second lens material, and 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.

[0029] Further, as a preferred embodiment rather than a limitation of the present invention, 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. 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 aspheric surface 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.

[0030] Further, as a preferred embodiment of the present invention rather than a limitation, the first lens is a glass spherical lens, the second lens is a plastic aspherical lens, the third lens is a plastic aspherical lens, the fourth lens is a glass spherical lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses. The fifth lens and the sixth lens form a cemented lens, and the remaining lenses are separated by air intervals. Through the reasonable combination of the lens shapes and optical powers, the design requirements of ultra-wide angle and miniaturization of the optical system are met. Specific embodiments: Embodiment 1 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.

[0032] 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, STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0033] The first lens E1 has a negative optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power, its object surface S8 is convex, and its image surface S9 is convex. The fifth lens E5 has a positive optical power, its object surface S10 is convex, and its image surface S11 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is concave, and its image surface S12 is concave. The seventh lens E7 has a positive optical power, its object surface S13 is convex, and its image surface S14 is convex. The filter E9 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0034] Table 1 shows the surface types, radii of curvature, thicknesses, and materials of the lenses of the optical imaging lens of Embodiment 1, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0035] Table 1

[0036] In Table 1, the object surface and the image surface of any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are aspherical surfaces. The surface profiles of the aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0037] 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 formula. Table 2 shows the conic coefficients and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface that can be used in the first embodiment.

[0038] Table 2

[0039] Embodiment 2: The following refers to Figures 3 to 4 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.

[0040] As Figure 3 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, STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0041] The first lens E1 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 positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a positive optical power, its object side surface S8 is a convex surface, and its image side surface S9 is a convex 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 each surface S1 to S16 and finally forms an image on the imaging surface S17.

[0042] Table 3 shows the surface types, curvature radii, thicknesses, and materials of the lenses of the optical imaging lens of Embodiment 2, where the units of the curvature radius and the thickness are both millimeters (mm).

[0043] Table 3

[0044] In Table 3, any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, and the seventh lens E7 has an aspherical surface on both the object side and the image side. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0045] 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 of the respective aspherical surfaces that can be used in the second embodiment.

[0046] Table 4

[0047] Embodiment Three The following refers to Figures 5 to 6 to describe an optical imaging lens according to Embodiment 3 of the present application. Figure 5 FIG. shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application.

[0048] As Figure 5 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, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0049] [3] 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 positive optical power. Its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. 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 respective surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0050] Table 5 shows the surface types, curvature radii, thicknesses, and materials of the respective lenses of the optical imaging lens of Embodiment 3, where the units of the curvature radii and the thicknesses are both millimeters (mm).

[0051] Table 5

[0052] In Table 5, 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:

[0053] Where 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 respective aspherical surfaces that can be used in the third embodiment.

[0054] Table 6

[0055] In Embodiments 1-3, the basic data is as follows: Table 7

[0056] In Embodiments 1-3, each conditional expression satisfies the conditions in the following table: Table 8

[0057] An imaging module includes at least an optical lens, and the above-mentioned vehicle-mounted optical system is installed inside the optical lens. It has the advantages of high pixel, 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.

[0058] 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 invention is only limited to these descriptions. Any method, structure, etc. that is approximate or identical to the present invention, or any technical deduction or replacement made under the premise of the concept of the present invention, should be regarded as the protection scope of the present invention.

Claims

1. An optical system for high - pixel machine vision recognition, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane. It is characterized in that: The first lens has a negative optical power. Its object side is convex and its image side is concave. The second lens has a negative optical power. Its object side is convex and its image side is concave. The third lens has a positive optical power. Its object side is convex and its image side is concave. The fourth lens has a positive optical power. Its object side is convex and its image side is convex. The fifth lens has a positive optical power. Its object side is convex and its image side is convex. The sixth lens has a negative optical power. Its object side is concave and its image side is concave. The fifth lens and the sixth lens form a cemented lens. The seventh lens has a positive optical power. Its object side is convex and its image side is convex. The lenses of this optical system satisfy the following conditions: -4.03mm < f1 < 1.61mm; -12.21mm < f2 < -8.52mm; 9.85mm < f3 < 13.26mm; 3.31mm < f4 < 5.34mm; 7.45mm < f5 < 10.00mm; -2.29mm < f6 < -6mm; 3.89mm < f7; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third 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.

2. The optical system for high - pixel machine vision recognition according to claim 1, wherein: The lenses of this optical system satisfy the following conditions: -3.015 < f1 / f < 2.305; -6.105 < f2 / f < -2.26; 4.925 < f3 / f < 6.63; 1.655 < f4 / f < 2.67; 3.725 < f5 / f < 5.00; -1.145 < f6 / f < -3.00; 1.84 < 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, f3 is the effective focal length of the third 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 optical system for high - pixel machine vision recognition according to claim 1, wherein: This optical system satisfies the following condition: 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.

4. The optical system for high-pixel machine vision recognition according to any one of claims 1-3, characterized in that: The fourth lens is a glass lens, and the material satisfies: Nd4>1.70, Vd4<52.40; Where Nd4 is the refractive index of the material of the fourth lens and Vd4 is the Abbe number of the material of the fourth lens.

5. The optical system for high-pixel machine vision recognition according to any one of claims 1-3, characterized in that: This optical system satisfies the following relationship: -1.4 < f5 / f6 < -9.0; 1.78 < Vd5 / Vd6 < 3.15; Among them, 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 optical system for high - pixel machine vision recognition according to any one of claims 1 - 3, characterized in that: This optical system satisfies the following relationships: Nd1 > 1.69, Vd1 < 60, Nd2 < 1.60, Vd2 > 50, Nd6 > 1.60, Vd6 < 25; Among them, 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.

7. The optical system for high-pixel machine vision recognition according to any one of claims 1-3, characterized in that: This optical system satisfies the following condition: D1 / (Fno*Ymax) < 1.46; Among them, 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.

8. The optical system for high - pixel machine vision recognition according to any one of claims 1 - 3, characterized in that: The full field of view angle FOV of this optical system ∈ [120°, 180°], and the total length of the optical system TTL ≤ 15.50 mm.

9. The optical system for high - pixel machine vision recognition according to any one of claims 1 - 3, characterized in that: The first lens is a glass spherical lens, the second lens is a plastic aspherical lens, the third lens is a plastic aspherical lens, the fourth lens is a glass spherical lens, the fifth, sixth, and seventh lenses are plastic aspherical lenses, the fifth and sixth lenses form a cemented lens, and the remaining lenses are separated by air; The aperture stop of this optical system is located between the third lens and the fourth lens.

10. An imaging module, at least comprising an optical lens, characterized in that: The optical lens is installed with the optical system for high-pixel machine vision recognition according to any one of claims 1-9.

Images