Machine vision optical systems and their applications camera modules
By using a machine vision optical system composed of 7 lenses, the optical power and refractive index are rationally allocated, solving the problems of excessive lens number and poor imaging effect in the existing technology. This enables a miniaturized camera lens with high pixel count and ultra-wide angle, improving the imaging quality of motion-sensing game devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG HONGJING OPTOELECTRONICS TECHONLOGY CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-06-02
AI Technical Summary
Existing technologies struggle to achieve high-resolution, ultra-wide-angle, and miniaturized machine vision optical systems, especially in motion-sensing gaming devices, where camera lens designs suffer from excessive lens elements, complex structures, and poor imaging results.
The machine vision optical system consists of 7 lenses, which rationally allocate the optical power and refractive index of the lenses and optimize the lens design to meet the requirements of ultra-wide angle and miniaturization. By controlling distortion and chromatic aberration, the imaging quality is improved.
It achieves high-pixel, ultra-wide-angle imaging effects. The lens structure is compact, making it easy to process and install, thus improving the imaging effect of the device.
Smart Images
Figure CN224317841U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging, and more particularly to a machine vision optical system and a camera module for its application. Background Technology
[0002] Motion-sensing games are popular in Europe and America, and are gradually spreading to Asian and European countries. New motion-sensing games can simulate three-dimensional scenes, allowing players to control the characters' movements through their own body, immersing them fully in the game and providing a healthy gaming experience. Due to its broad appeal across a wide age range, it has a promising market prospect. As a core component of motion-sensing game devices, the camera lens also has significant development potential. Therefore, providing a high-resolution, ultra-wide-angle, and miniaturized high-performance system has become a key objective. Utility Model Content
[0003] This application aims to provide a machine vision optical system with high resolution, ultra-wide angle and miniaturization.
[0004] To achieve its purpose, this utility model adopts the following technical solution:
[0005] A machine vision optical system comprises, in sequence along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
[0006] The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative.
[0007] The object side of the second lens is convex, and the image side is concave, and its optical power is negative.
[0008] The object plane side of the third lens is concave, the image plane side is convex, and its optical power is positive.
[0009] The fourth lens has convex surfaces on both the object plane and the image plane, and its optical power is positive.
[0010] Both the object plane side and the image plane side of the fifth lens are convex, and its optical power is positive.
[0011] The object plane and image plane of the sixth lens are both concave, and its optical power is negative.
[0012] The seventh lens has a convex surface on the object side and a concave surface on the image side, and its optical power is positive.
[0013] Furthermore, each lens in this optical system satisfies the following condition:
[0014] -6.5 mm < f1 < -2.5 mm;
[0015] -16.3 mm < f2 < -10 mm;
[0016] 50 mm < f3 < 130 mm;
[0017] 3.50 mm < f4 < 6.5 mm;
[0018] 1.5 mm < f5 < 3.5 mm;
[0019] -3.5 mm < f6 < -1.5 mm;
[0020] 13 mm < f7 < 30 mm;
[0021] Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.
[0022] Furthermore, the radius of curvature R1 on the object side of the first lens satisfies: R1 < 11 mm.
[0023] Furthermore, the optical system satisfies the following condition: TTL ≤ 15.9mm;
[0024] Where TTL is the on-axis distance from the object side of the first lens to the imaging plane.
[0025] Furthermore, each lens in this optical system satisfies the following condition:
[0026] 1.5<Nd1<2.1, 20.00<Vd1<50;
[0027] 1.51<Nd2<1.62, 52.50<Vd2<58.00;
[0028] 1.61<Nd3<2.1, 16<Vd3<35;
[0029] 1.45<Nd4<1.65, 53.5<Vd4<70;
[0030] 1.51<Nd5<1.62, 52.50<Vd5<58.00;
[0031] 1.61<Nd6<2.1, 16<Vd6<35;
[0032] 1.51<Nd7<1.62, 52.50<Vd7<58.00;
[0033] Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, and Vd7 is the Abbe number of the seventh lens.
[0034] Furthermore, the fourth lens is spherical.
[0035] Furthermore, the FNO of this optical system satisfies: FNO≤2.1.
[0036] Furthermore, the field of view (FOV) of this optical system satisfies: 185° ≤ FOV.
[0037] Furthermore, the fifth and sixth lenses are cemented lenses.
[0038] Furthermore, the refractive index Nd and Abbe number Vd of the two lenses in the cemented lens satisfy the following conditions: 1.51 < Nd5 < 1.62, 52.50 < Vd5 < 58.00; 1.61 < Nd6 < 2.1, 16 < Vd6 < 35.
[0039] On the other hand, embodiments of this application also provide a camera module, which includes at least an optical lens, and the aforementioned machine vision optical system is installed in the optical lens.
[0040] Compared with the prior art, the beneficial effects of this application are as follows:
[0041] This utility model provides a machine vision optical system and its application camera module, which is mainly composed of 7 lenses. The number of lenses is reasonable and the structure is simple. By reasonably allocating the optical power of the lenses, the design requirements of ultra-wide angle and miniaturization of the optical system are effectively met. The high-pixel machine vision recognition optical system configured in this application has the advantages of high pixel count, strong resolution and ultra-wide angle design. It has a compact structure, is easy to process and install, and further improves the imaging effect of the equipment paired with the system. Attached Figure Description
[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0043] Figure 1 This is a schematic diagram of the structure of the optical system or camera lens in Embodiment 1 of this application;
[0044] Figure 2This is a field curvature and distortion curve diagram of the optical system or camera lens of Embodiment 1 of this application;
[0045] Figure 3 This is an MTF curve of the optical system or camera lens of Embodiment 1 of this application;
[0046] Figure 4 This is a schematic diagram of the structure of the optical system or camera lens in Embodiment 2 of this application;
[0047] Figure 5 This is a field curvature and distortion curve diagram of the optical system or camera lens in Embodiment 2 of this application;
[0048] Figure 6 This is the MTF curve of the optical system or camera lens in Embodiment 2 of this application;
[0049] Figure 7 This is a schematic diagram of the structure of the optical system or camera lens in Embodiment 3 of this application;
[0050] Figure 8 This is a field curvature and distortion curve diagram of the optical system or camera lens in Embodiment 3 of this application;
[0051] Figure 9 This is the MTF curve of the optical system or camera module in Embodiment 3 of this application. Detailed Implementation
[0052] like Figure 1-9 As shown, this application provides a machine vision optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop STO, a fifth lens E5, a sixth lens E6, and a seventh lens E7 in sequence along the optical axis from the object plane to the image plane.
[0053] The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative.
[0054] The object side of the second lens is convex, and the image side is concave, and its optical power is negative.
[0055] The object plane side of the third lens is concave, the image plane side is convex, and its optical power is positive.
[0056] The fourth lens has convex surfaces on both the object plane and the image plane, and its optical power is positive.
[0057] Both the object plane side and the image plane side of the fifth lens are convex, and its optical power is positive.
[0058] The object plane and image plane of the sixth lens are both concave, and its optical power is negative.
[0059] The seventh lens has a convex surface on the object side and a concave surface on the image side, and its optical power is positive.
[0060] The optical system of this application embodiment is mainly composed of 7 lenses. The number of lenses is reasonable and the structure is simple. By reasonably allocating the optical power of the lenses, the design requirements of ultra-wide angle and miniaturization of the optical system are effectively met. The high-pixel machine vision recognition optical system configured in this application has the advantages of high pixel count, strong resolution and ultra-wide angle design. It has a compact structure, is easy to process and install, and further improves the imaging effect of the equipment paired with the system.
[0061] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, each lens of the optical system satisfies the following conditions: where f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, and f7 is the focal length of the seventh lens E7;
[0062] -6.5mm < f1 < -2.5 mm, by constraining the effective focal length of the first lens E1 within a reasonable range, the distortion of the system is controlled, so that the imaging center has a higher angular resolution;
[0063] -16.3 mm < f2 < -10 mm; By constraining the effective focal length of the second lens E2 within a reasonable range, lens aberrations are optimized and image quality is improved.
[0064] 50 mm < f3 < 130 mm; By constraining the effective focal length of the third lens E3 within a reasonable range, the spherical aberration of the system can be finely adjusted and controlled, thereby effectively improving the imaging quality of the system.
[0065] 3.50 mm < f4 < 6.5 mm; By reasonably controlling the effective focal length of the fourth lens E4 within a reasonable range, the imaging quality of the system is effectively improved.
[0066] 1.5 mm < f5 < 3.5 mm; By constraining the effective focal length of the fifth lens E5 within a reasonable range, the image quality is improved.
[0067] -3.5 mm < f6 < -1.5 mm; By constraining the effective focal length of the sixth lens E6 within a reasonable range, lens aberrations are optimized and resolving performance is improved.
[0068] 13 mm < f7 < 30 mm; By constraining the effective focal length of the seventh lens E7 within a reasonable range, lens aberrations are optimized and field curvature of the system is improved.
[0069] Furthermore, the refractive index Nd1 and Abbe number Vd1 of the first lens E1 satisfy: 1.5 < Nd1 < 2.1, 20.00 < Vd1 < 50. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0070] Furthermore, the refractive index Nd2 and Abbe number Vd2 of the second lens E2 satisfy: 1.51 < Nd2 < 1.62, 52.50 < Vd2 < 58.00. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0071] Furthermore, the refractive index Nd3 and Abbe number Vd3 of the third lens E3 satisfy: 1.61 < Nd3 < 2.1, 16 < Vd3 < 35. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0072] Furthermore, the refractive index Nd4 and Abbe number Vd4 of the fourth lens E4 satisfy: 1.45 < Nd4 < 1.65, 53.5 < Vd4 < 70. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0073] Furthermore, the refractive index Nd5 and Abbe number Vd5 of the fifth lens E5 satisfy: 1.51 < Nd5 < 1.62, 52.50 < Vd5 < 58.00. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0074] Furthermore, the refractive index Nd6 and Abbe number Vd6 of the sixth lens E6 satisfy: 1.61 < Nd6 < 2.1, 16 < Vd6 < 35. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0075] Furthermore, the refractive index Nd7 and Abbe number Vd7 of the seventh lens E7 satisfy: 1.51 < Nd7 < 1.62, 52.50 < Vd7 < 58.00. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.
[0076] Furthermore, as a preferred embodiment of this utility model and not a limitation thereof, the fourth lens E4 is spherical, and by reasonably allocating the focal length of the lens, the lens aberration is optimized and the resolution performance is improved.
[0077] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the radius of curvature R1 of the object surface side of the first lens satisfies: R1 < 11mm. By controlling the object surface side of the first lens E1, the total deflection angle of the object surface side of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.
[0078] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following condition: TTL ≤ 15.9mm. This design can reduce the total optical length, thereby miniaturizing the lens and making the miniaturized wide-angle lens more competitive in the market.
[0079] Furthermore, as a preferred embodiment of this utility model and not a limitation thereof, the full field of view (FOV) of the optical system satisfies: 185°≤FOV and FNO≤2.1, which is beneficial to expanding the field of view of the lens and improving the light intake of the lens.
[0080] Furthermore, as a preferred embodiment of this utility model and not a limitation thereof, the refractive index Nd and Abbe number Vd of the two lenses in the cemented lens satisfy: 1.51 < Nd5 < 1.62, 52.50 < Vd5 < 58.00; 1.61 < Nd6 < 2.1, 16 < Vd6 < 35. This design increases the difference between the refractive index and the Abbe number of the lens, which can effectively reduce chromatic aberration.
[0081] Specifically, this is a preferred embodiment of the present invention and not a limitation thereof. Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown, as follows: Figure 1 As shown, the first lens E1 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the second lens E2 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the third lens E3 has a concave object plane S1 and a convex image plane S2, and its optical power is positive; the fourth lens E4 has both convex object plane S1 and image plane S2, and its optical power is positive; the fifth lens E5 has both convex object plane and image plane, and its optical power is positive; the sixth lens E6 has both concave object plane and image plane, and its optical power is negative; the seventh lens E7 has a convex object plane S1 and a concave image plane S2, and its optical power is positive; filter E7; light from the object passes through each surface in sequence and finally forms an image on the imaging plane.
[0082] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, where the units for radius of curvature and thickness are millimeters (mm):
[0083] Table 1: Basic parameters of the optical system in Example 1
[0084]
[0085] In Table 1 above, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E5, E6, and E7—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:
[0086]
[0087] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, and A20 that can be used for each aspherical surface in Example 1.
[0088] Table 2: Aspherical correlation values of the lens surface in Example 1
[0089]
[0090] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.
[0091] Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values in the meridional and sagittal directions of different fields of view.
[0092] Depend on Figure 2 and Figure 3 It can be seen that the optical lens given in Example 1 can achieve good imaging quality.
[0093] Specifically, this is a preferred embodiment of the present invention and not a limitation thereof. Figure 4 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown, as follows: Figure 4 As shown, the first lens E1 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the second lens E2 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the third lens E3 has a concave object plane S1 and a convex image plane S2, and its optical power is positive; the fourth lens E4 has both convex object plane S1 and image plane S2, and its optical power is positive; the fifth lens E5 has both convex object plane and image plane, and its optical power is positive; the sixth lens E6 has both concave object plane and image plane, and its optical power is negative; the seventh lens E7 has a convex object plane S1 and a concave image plane S2, and its optical power is positive; filter E7; light from the object passes through each surface in sequence and finally forms an image on the imaging plane.
[0094] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 2, where the units for radius of curvature and thickness are millimeters (mm):
[0095] Table 3: Basic parameters of the optical system in Example 2
[0096]
[0097] In Table 3 above, the object-side surface and image-side surface of any one of the following lenses—E2, E4, E5, E6, and E7—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:
[0098]
[0099] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, and A20 that can be used for each aspherical surface in Example 2.
[0100] Table 4: Aspherical correlation values of the lens surface in Example 2
[0101]
[0102] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.
[0103] Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values in the meridional and sagittal directions of different fields of view.
[0104] Depend on Figure 5 and Figure 6 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.
[0105] Specifically, this is a preferred embodiment of the present invention and not a limitation thereof. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown, as follows: Figure 4As shown, the first lens E1 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the second lens E2 has a convex object plane S1 and a concave image plane S2, and its optical power is negative; the third lens E3 has a concave object plane S1 and a convex image plane S2, and its optical power is positive; the fourth lens E4 has both convex object plane S1 and image plane S2, and its optical power is positive; the fifth lens E5 has both convex object plane and image plane, and its optical power is positive; the sixth lens E6 has both concave object plane and image plane, and its optical power is negative; the seventh lens E7 has a convex object plane S1 and a concave image plane S2, and its optical power is positive; filter E7; light from the object passes through each surface in sequence and finally forms an image on the imaging plane.
[0106] Table 5 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 3, where the units for radius of curvature and thickness are millimeters (mm):
[0107] Table 5: Basic parameters of the optical system in Example 3
[0108]
[0109] In Table 5 above, the object-side surface and image-side surface of any one of the following lenses—E2 (second lens), E4 (fourth lens), E5 (fifth lens), E6 (sixth lens), and E7 (seventh lens)—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:
[0110]
[0111] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, and A20 that can be used for each aspherical surface in Example 3.
[0112] Table 6: Aspherical Correlation Values of Lens Surface in Example 3
[0113]
[0114] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.
[0115] Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values in the meridional and sagittal directions of different fields of view.
[0116] Depend on Figure 8 and Figure 9 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.
[0117] The basic data for Examples 1-3 are shown in Table 7 below:
[0118] Table 7 Basic Data for Examples 1-3
[0119]
[0120] A camera lens includes at least an optical lens, within which the aforementioned machine vision optical system is installed. This utility model provides a camera lens with a reasonable number of lenses and a simple structure. By rationally allocating the lens power, it effectively meets the design requirements of an ultra-wide-angle and miniaturized optical system. The high-pixel machine vision recognition optical system configured in this application has the advantages of high pixel count, strong resolution, and ultra-wide-angle design. Its compact structure facilitates processing and installation, further improving the imaging effect of the equipment paired with this system.
[0121] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A machine vision optical system, comprising, in sequence along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, characterized in that: The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative. The object side of the second lens is convex, and the image side is concave, and its optical power is negative. The object plane side of the third lens is concave, the image plane side is convex, and its optical power is positive. The fourth lens has convex surfaces on both the object plane and the image plane, and its optical power is positive. Both the object plane side and the image plane side of the fifth lens are convex, and its optical power is positive. The object plane and image plane of the sixth lens are both concave, and its optical power is negative. The seventh lens has a convex surface on the object side and a concave surface on the image side, and its optical power is positive.
2. The machine vision optical system according to claim 1, characterized in that: Each lens in this optical system satisfies the following condition: -6.5 mm < f1 < -2.5 mm; and / or -16.3 mm < f2 < -10 mm; and / or 50 mm < f3 < 130 mm; and / or 3.50 mm < f4 < 6.5 mm; and / or 1.5 mm < f5 < 3.5 mm; and / or -3.5 mm < f6 < -1.5 mm; and / or 13 mm < f7 < 30 mm; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.
3. The machine vision optical system according to claim 1, characterized in that: The radius of curvature R1 on the object side of the first lens satisfies: R1 < 11 mm.
4. The machine vision optical system according to any one of claims 1-3, characterized in that: The optical system meets the following condition: TTL ≤ 15.9mm; Where TTL is the on-axis distance from the object side of the first lens to the imaging plane.
5. The machine vision optical system according to any one of claims 1-3, characterized in that: Each lens in this optical system satisfies the following condition: 1.5 < Nd1 < 2.1, 20.00 < Vd1 < 50; and / or 1.51 < Nd2 < 1.62, 52.50 < Vd2 < 58.00; and / or 1.61 < Nd3 < 2.1, 16 < Vd3 < 35; and / or 1.45 < Nd4 < 1.65, 53.5 < Vd4 < 70; and / or 1.51 < Nd5 < 1.62, 52.50 < Vd5 < 58.00; and / or 1.61 < Nd6 < 2.1, 16 < Vd6 < 35; and / or 1.51<Nd7<1.62, 52.50<Vd7<58.00; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, and Vd7 is the Abbe number of the seventh lens.
6. The machine vision optical system according to any one of claims 1-3, characterized in that: The fourth lens is spherical.
7. The machine vision optical system according to any one of claims 1-3, characterized in that: The FNO of this optical system satisfies: FNO≤2.
1.
8. The machine vision optical system according to any one of claims 1-3, characterized in that: The field of view (FOV) of this optical system satisfies: 185° ≤ FOV.
9. The machine vision optical system according to any one of claims 1-3, characterized in that: The fifth and sixth lenses are cemented lenses. The refractive indices Nd and Abbe numbers Vd of the two cemented lenses satisfy the following conditions: 1.51 < Nd5 < 1.62, 52.50 < Vd5 < 58.00; 1.61 < Nd6 < 2.1, 16 < Vd6 < 35.
10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the machine vision optical system according to any one of claims 1-9.