Optical lens and imaging detection system

Abstract

The application provides an optical lens and an imaging detection system, which can guarantee high pixel quality and achieve the purpose of simplifying the structure. The optical lens comprises: a lens group, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along the optical axis; the first lens has positive refractive power, and the object side surface and the image side surface of the first lens are convex and concave in sequence; the second lens has refractive power, and the image side surface of the second lens is convex; the third lens has negative refractive power, and the object side surface and the image side surface of the third lens are both concave; the fourth lens has positive refractive power, and the image side surface of the fourth lens is convex; the fifth lens has positive refractive power, and the image side surface of the fifth lens is convex; the sixth lens has refractive power; the first lens and the second lens are cemented to form a cemented lens; and a filter is arranged on the image side of the sixth lens along the optical axis.

Description

Technical Field

[0001] This invention relates to the field of imaging detection technology, and in particular to an optical lens and an imaging detection system. Background Technology

[0002] With the development and popularization of emerging technologies such as autonomous driving and driver assistance systems, the market demand for automotive lenses is increasing, especially in complex environments such as under-vehicle areas and common blind spots, where high-quality imaging lenses are needed. However, on the one hand, the industry's requirements for lens resolution are getting higher and higher; on the other hand, with the increase in equipment integration, the industry is demanding smaller and smaller lens sizes, which brings huge challenges to the development of automotive lenses. Summary of the Invention

[0003] One advantage of this invention is that it provides an optical lens and an imaging detection system that can achieve a simplified structure while ensuring high pixel quality.

[0004] Another advantage of the present invention is that it provides an optical lens and an imaging detection system, wherein, in one embodiment of the present invention, the optical lens is conducive to both lens miniaturization and aberration correction, so as to meet the requirements of automotive application environments.

[0005] Another advantage of the present invention is that it provides an optical lens and an imaging detection system, wherein, in one embodiment of the present invention, the imaging detection system can reduce manufacturing costs and improve product competitiveness while meeting the requirements of complex environments such as complex environments, vehicle undercarriages, or conventional blind spots.

[0006] Another advantage of this invention is that it provides an optical lens and imaging detection system in which a complex system is not required to achieve the aforementioned objectives. Therefore, this invention successfully and effectively provides a solution that not only offers a simple optical lens and imaging detection system, but also increases the practicality and reliability of the optical lens and imaging detection system.

[0007] To achieve at least one of the above-described advantages or other benefits and objectives of the present invention, the present invention provides an optical lens, comprising:

[0008] A lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially along the optical axis from the object side to the image side; the first lens has positive optical power, and its object-side and image-side surfaces are convex and concave, respectively; the second lens has optical power, and its image-side surface is convex; the third lens has negative optical power, and both its object-side and image-side surfaces are concave; the fourth lens has positive optical power, and its image-side surface is convex; the fifth lens has positive optical power, and its image-side surface is convex; the sixth lens has optical power; the first lens and the second lens are cemented together to form a cemented lens; and

[0009] A filter is disposed coaxially on the image side of the sixth lens.

[0010] In one embodiment of this application, the third lens and the fourth lens are aspherical lenses.

[0011] In one embodiment of this application, the optical lens satisfies the following relationship:

[0012] 4 < (f3 + f4) / f < 8;

[0013] Where f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; and f is the total focal length of the optical lens.

[0014] In one embodiment of this application, the third lens, the fourth lens, and the fifth lens satisfy the following relationship:

[0015] 0.1 < (f3 + f4) / f5 < 0.3;

[0016] Wherein, f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; and f5 is the focal length of the fifth lens.

[0017] In one embodiment of this application, the first lens, the second lens, the third lens, and the fourth lens satisfy the following relationship:

[0018] -3 < (R1 + R3) / (R4 + R7) < -1;

[0019] Wherein, R1 is the radius of curvature of the object-side surface of the first lens; R3 is the radius of curvature of the image-side surface of the second lens; R4 is the radius of curvature of the object-side surface of the third lens; and R7 is the radius of curvature of the image-side surface of the fourth lens.

[0020] In one embodiment of this application, the bandpass of the filter is greater than or equal to 430 nm and less than or equal to 650 nm.

[0021] In one embodiment of this application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy the following relationship:

[0022] 0.9<(Nd1+Nd2+Nd3) / (Nd4+Nd5+Nd6)≤1;

[0023] Wherein, Nd1 is the refractive index of the first lens; Nd2 is the refractive index of the second lens; Nd3 is the refractive index of the third lens; Nd4 is the refractive index of the fourth lens; Nd5 is the refractive index of the fifth lens; and Nd6 is the refractive index of the sixth lens.

[0024] In one embodiment of this application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy the following relationship:

[0025] 0.7<(Vd1+Vd2+Vd3) / (Vd4+Vd5+Vd6)<2;

[0026] Wherein, Vd1 is the Abbe number of the first lens; Vd2 is the Abbe number of the second lens; Vd3 is the Abbe number of the third lens; Vd4 is the Abbe number of the fourth lens; Vd5 is the Abbe number of the fifth lens; and Vd6 is the Abbe number of the sixth lens.

[0027] In one embodiment of this application, the optical lens satisfies the following relationship:

[0028] 0.03 < BFL / TTL < 0.2;

[0029] Wherein, BFL is the back focal length of the optical lens; TTL is the total length of the optical lens.

[0030] In one embodiment of this application, the optical lens satisfies the following relationship:

[0031] 6 ≤ FOV * f / h ≤ 17.5;

[0032] Wherein, FOV is the maximum field of view of the optical lens; f is the total focal length of the optical lens; and h is the image height of the optical lens.

[0033] According to another aspect of this application, one embodiment of this application further provides an imaging detection system, comprising:

[0034] Any of the optical lenses described above;

[0035] A photosensitive element, which is correspondingly disposed on the image side of the optical lens; and

[0036] A mirror assembly, which is correspondingly disposed on the object side of the optical lens.

[0037] In one embodiment of this application, the reflector group consists of a first reflector and a second reflector; the first reflector is coaxially disposed on the object side of the optical lens; the second reflector is fitted around the optical lens and is used to reflect object light to propagate to the first reflector; the first reflector is used to reflect object light from the second reflector to propagate to the optical lens.

[0038] In one embodiment of this application, the first reflector is a planar reflector spaced apart from the optical lens; the second reflector is a parabolic reflector with a central light-passing aperture.

[0039] In one embodiment of this application, the diameter of the central light-transmitting hole of the parabolic reflector is between 4 mm and 8 mm.

[0040] In one embodiment of this application, the effective aperture of the first reflector is between 35 mm and 40 mm.

[0041] In one embodiment of this application, the axial distance between the first reflector and the second reflector is between 13.8 mm and 16.5 mm. Attached Figure Description

[0042] Figure 1 This is a first example of an imaging detection system according to an embodiment of this application;

[0043] Figure 2 A schematic diagram of the structure of an optical lens in the imaging detection system of the first example described above according to this application is shown;

[0044] Figure 3A A dot matrix schematic diagram of the imaging detection system according to the first example described above in this application is shown;

[0045] Figure 3B A schematic diagram of the MTF of the imaging detection system according to the first example described above is shown;

[0046] Figure 3C A schematic diagram of the field curvature of the imaging detection system according to the first example described above is shown;

[0047] Figure 3D A schematic diagram of distortion of the imaging detection system according to the first example described above is shown;

[0048] Figure 3EA schematic diagram of the color difference of the imaging detection system according to the first example described above in this application is shown;

[0049] Figure 4 A second example of an imaging detection system according to the above embodiments of this application is shown;

[0050] Figure 5 A schematic diagram of the structure of the optical lens in the imaging detection system of the second example described above according to this application is shown;

[0051] Figure 6A A dot matrix schematic diagram of the imaging detection system according to the second example described above in this application is shown;

[0052] Figure 6B A schematic diagram of the MTF of the imaging detection system according to the second example described above in this application is shown;

[0053] Figure 6C A schematic diagram of the field curvature of the imaging detection system according to the second example described above is shown;

[0054] Figure 6D A schematic diagram of the distortion of the imaging detection system according to the second example described above in this application is shown;

[0055] Figure 6E A schematic diagram of the color difference of the imaging detection system according to the second example described above in this application is shown;

[0056] Figure 7 A third example of an imaging detection system according to the above embodiments of this application is shown;

[0057] Figure 8 A schematic diagram of the structure of the optical lens in the imaging detection system of the third example described above according to this application is shown;

[0058] Figure 9A A dot matrix schematic diagram of the imaging detection system according to the third example described above in this application is shown;

[0059] Figure 9B A schematic diagram of the MTF of the imaging detection system according to the third example described above in this application is shown;

[0060] Figure 9C A schematic diagram of the field curvature of the imaging detection system according to the third example described above is shown;

[0061] Figure 9D A schematic diagram of the distortion of the imaging detection system according to the third example described above in this application is shown;

[0062] Figure 9E A schematic diagram of the chromatic aberration of the imaging detection system according to the third example described above in this application is shown.

[0063] Explanation of key component symbols: 10, optical lens; 11, lens group; 111, first lens; 112, second lens; 113, third lens; 114, fourth lens; 115, fifth lens; 116, sixth lens; 12, filter; 20, mirror group; 21, first mirror; 210, plane mirror; 22, second mirror; 220, parabolic mirror; 221, central light passage; 30, photosensitive element.

[0064] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0065] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0066] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0067] In this invention, the term "a" in the claims and specification should be understood as "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless explicitly indicated in the disclosure of this invention that the number of the element is only one, the term "a" should not be construed as unique or single, and the term "a" should not be construed as a limitation on the quantity.

[0068] In the description of this invention, it should be understood that terms such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, terms such as "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through a medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Considering the industry's increasing demands for both higher resolution and smaller lens sizes, the development of automotive lenses presents significant challenges. This application provides an optical lens and imaging detection system that achieves a simplified structure while maintaining high-pixel image quality.

[0071] Specifically, refer to the accompanying drawings in the specification of this application. Figures 1 to 9E According to one embodiment of this application, an imaging detection system is provided, which may include an optical lens 10, a mirror group 20, and a photosensitive component 30. The mirror group 20 is correspondingly disposed on the object side of the optical lens 10 to reflect object light to propagate to the optical lens 10, thereby increasing the system's field of view and meeting the field of view requirements of complex environments, vehicle undercarriages, and conventional blind spots. The photosensitive component 30 is correspondingly disposed on the image side of the optical lens 10 to receive object light modulated by the optical lens 10 for imaging.

[0072] More specifically, such as Figure 2 , Figure 5 as well as Figure 8As shown, the optical lens 10 may include a lens group 11 and a filter 12. The lens group 11, along the optical axis from the object side to the image side, consists of a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, and a sixth lens 116. The first lens 111 has positive optical power, and its object-side surface and image-side surface are convex and concave, respectively. The second lens 112 has optical power, and its image-side surface is convex. The third lens 113 has negative optical power, and its object-side surface... Both the first lens 111 and the second lens 112 are concave; the fourth lens 114 has positive optical power, and its image-side surface is convex; the fifth lens 115 has positive optical power, and its image-side surface is convex; the sixth lens 116 has optical power; the first lens 111 and the second lens 112 are cemented together to form a cemented lens; this lens combination not only facilitates the miniaturization of optical lenses, meeting industry requirements for lens size, but also facilitates aberration correction, meeting industry requirements for lens resolution. The filter 12 is coaxially disposed on the image-side of the sixth lens 116, which helps to improve lens transmittance and image quality.

[0073] It is worth noting that the lens group 11 of this application can adopt an all-glass structure, so as to achieve a simplified structure while maintaining megapixel image quality by optimizing the positive and negative focal lengths of the six lenses, thus meeting the industry's high requirements for lens size and lens resolution. In addition, the lens surface shape in the lens group 11 of this application is beneficial to the light collection of the lens and increases the incident angle of the principal ray, thereby ensuring a high degree of matching between the incident angle of the principal ray of the lens and the incident angle of the principal ray of the chip.

[0074] Optionally, the third lens 113 and the fourth lens 114 are aspherical lenses, which have a high degree of freedom, are highly optimizable, and are easy to eliminate spherical aberration and field curvature, thus improving the imaging quality of the system and correcting aberrations.

[0075] Optionally, the optical lens 10 satisfies the following relationship:

[0076] 4 < (f3 + f4) / f < 8;

[0077] Where f3 is the focal length of the third lens 113; f4 is the focal length of the fourth lens 114; and f is the total focal length of the optical lens 10.

[0078] In other words, the above formula specifies that the ratio of the sum of the focal lengths of the third lens 113 and the fourth lens 114 to the total focal length of the optical lens 10 is in the range of 4 < (f3 + f4) / f < 8. Thus, by constraining the focal length f3 of the third lens 113, the focal length f4 of the fourth lens 114, and the total focal length f of the optical lens 10, this application can effectively receive light passing through the front optical lens, which is beneficial for reducing the aperture of the optical lens 10.

[0079] Optionally, the third lens 113, the fourth lens 114, and the fifth lens 115 satisfy the following relationship:

[0080] 0.1 < (f3 + f4) / f5 < 0.3;

[0081] Wherein, f3 is the focal length of the third lens 113; f4 is the focal length of the fourth lens 114; and f5 is the focal length of the fifth lens 115.

[0082] In other words, the above formula specifies that the ratio of the sum of the focal lengths of the third lens 113 and the fourth lens 114 to the focal length of the fifth lens 115 is in the range of 0.1 < (f3 + f4) / f5 < 0.3. Thus, by constraining the focal length f3 of the third lens 113, the focal length f4 of the fourth lens 114, and the focal length f5 of the fifth lens 115, this application can effectively receive light entering through the front-end optical lens, correct distortion and field curvature caused by the front-end optical lens, and improve the imaging quality of the optical lens.

[0083] Optionally, the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114 satisfy the following relationship:

[0084] -3 < (R1 + R3) / (R4 + R7) < -1;

[0085] Wherein, R1 is the radius of curvature of the object side surface of the first lens 111; R3 is the radius of curvature of the image side surface of the second lens 112; R4 is the radius of curvature of the object side surface of the third lens 113; and R7 is the radius of curvature of the image side surface of the fourth lens 114.

[0086] In other words, the above formula specifies that the ratio of the sum of the radii of curvature of the corresponding sides of the first lens 111 and the second lens 112 to the sum of the radii of curvature of the corresponding sides of the third lens 113 and the fourth lens 114 is in the range of -3 < (R1 + R3) / (R4 + R7) < -1. Thus, by constraining the radii of curvature of the first lens 111, the second lens 112, the third lens 113, and the fourth lens 114, this application can effectively correct and balance the aberrations of the optical lens, which is beneficial to improving the resolving power of the optical system and reducing the manufacturing cost of the optical lens 10.

[0087] Optionally, the filter 12 mentioned in this application may, but is not limited to, be implemented as an infrared cut-off filter located between the imaging surface of the sixth lens 116 and the optical lens 10, for cutting off infrared light and improving imaging quality.

[0088] Optionally, the filter 12 has a bandpass wavelength greater than or equal to 430nm and less than or equal to 650nm, which is beneficial for blocking infrared light while maintaining high transmittance of visible light, thereby improving lens transmittance and reducing the risk of stray light ghosting.

[0089] Optionally, the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 116 satisfy the following relationship:

[0090] 0.9<(Nd1+Nd2+Nd3) / (Nd4+Nd5+Nd6)≤1;

[0091] Wherein, Nd1 is the refractive index of the first lens 111; Nd2 is the refractive index of the second lens 112; Nd3 is the refractive index of the third lens 113; Nd4 is the refractive index of the fourth lens 114; Nd5 is the refractive index of the fifth lens 115; and Nd6 is the refractive index of the sixth lens 116.

[0092] In other words, the above formula specifies that the ratio of the sum of the refractive indices of the first lens 111, the second lens 112, and the third lens 113 to the sum of the refractive indices of the fourth lens 114, the fifth lens 115, and the sixth lens 116 is within the range of 0.9 < (Nd1 + Nd2 + Nd3) / (Nd4 + Nd5 + Nd6) ≤ 1. Thus, by constraining the refractive indices of each lens in the lens group 11, this application can effectively match lens materials, which is beneficial for correcting spherical aberration and astigmatism, and improving the stability of the optical system.

[0093] Optionally, the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115, and the sixth lens 116 satisfy the following relationship:

[0094] 0.7<(Vd1+Vd2+Vd3) / (Vd4+Vd5+Vd6)<2;

[0095] Wherein, Vd1 is the Abbe number of the first lens 111; Vd2 is the Abbe number of the second lens 112; Vd3 is the Abbe number of the third lens 113; Vd4 is the Abbe number of the fourth lens 114; Vd5 is the Abbe number of the fifth lens 115; and Vd6 is the Abbe number of the sixth lens 116.

[0096] In other words, the above formula specifies that the ratio of the sum of the Abbe numbers of the first lens 111, the second lens 112, and the third lens 113 to the sum of the Abbe numbers of the fourth lens 114, the fifth lens 115, and the sixth lens 116 is within the range of 0.7 < (Vd1 + Vd2 + Vd3) / (Vd4 + Vd5 + Vd6) < 2. Thus, by constraining the Abbe numbers of each lens in the lens group 11, this application can effectively match the lens materials, which is also beneficial for correcting spherical aberration and astigmatism, and improving the stability of the optical system.

[0097] Optionally, the optical lens 10 satisfies the following relationship:

[0098] 0.03 < BFL / TTL < 0.2;

[0099] Wherein, BFL is the back focal length of the optical lens 10; TTL is the total length of the optical lens 10.

[0100] In other words, the above formula specifies that the ratio of the back focal length to the total length of the optical lens 10 is in the range of 0.03 < BFL / TTL < 0.2. Thus, by constraining the back focal length and total optical length of the optical lens 10, this application facilitates the miniaturization of the optical lens 10 and improves its relative illumination.

[0101] Optionally, the optical lens 10 satisfies the following relationship:

[0102] 6 ≤ FOV * f / h ≤ 17.5;

[0103] Wherein, FOV is the maximum field of view of the optical lens 10; f is the total focal length of the optical lens 10; and h is the image height of the optical lens 10.

[0104] In other words, the above formula specifies that the ratio of the product of the maximum field of view and the total focal length of the optical lens 10 to the image height of the optical lens 10 corresponding to the maximum field of view is within the range of 6 ≤ FOV*f / h ≤ 17.5. Thus, by constraining the field of view, total focal length, and image height of the optical lens 10, this application facilitates real-time target observation, improves the utilization rate of the chip pixel area, and makes it easier to increase pixel density.

[0105] According to the above embodiments of this application, as Figure 1 , Figure 4 as well as Figure 7As shown, the reflector group 20 can be composed of a first reflector 21 and a second reflector 22; the first reflector 21 is coaxially disposed on the object side of the optical lens 10; the second reflector 22 is fitted around the optical lens 10 and is used to reflect object light to propagate to the first reflector 21; the first reflector 21 is used to reflect object light from the second reflector 22 to propagate to the optical lens 10 for imaging; thus, this application can achieve a 360° horizontal panoramic visual effect through the reflector group 20, increasing the range of application occasions and environmental conditions, and is particularly suitable for complex environments such as complex environments, under vehicles, or conventional blind spots.

[0106] It is worth noting that, such as Figure 1 , Figure 4 as well as Figure 7 As shown, the first reflecting mirror 21 can be implemented as a plane reflecting mirror 210 spaced apart from the optical lens 10; the second reflecting mirror 22 can be implemented as a parabolic reflecting mirror 220 with a central light-passing aperture 221, so as to increase the range of applications and environmental conditions while reducing manufacturing costs and improving product competitiveness. Furthermore, in the parabolic reflecting mirror 220 of this application, the reflecting surface facing the object side is convex.

[0107] Optionally, the diameter of the central light-transmitting aperture 221 of the parabolic reflector 220 is between 4 mm and 8 mm, which helps to suppress stray light ghosting and block unwanted light from entering the optical lens 10. It is understood that the central light-transmitting aperture 221 mentioned in this application is located at the object-side end of the parabolic reflector 220.

[0108] Optionally, the effective aperture of the second reflector 22 is between 35mm and 40mm to ensure that all light reflected by the second reflector 22 can be received by the optical lens 10 after being reflected by the first reflector 21 for imaging. It can be understood that the effective aperture of the second reflector 22 may refer to the image-side aperture of the parabolic reflector 220, i.e., the maximum aperture of the parabolic reflector 220, which is also the maximum aperture of the entire system.

[0109] Optionally, the axial distance between the first reflector 21 and the second reflector 22 is between 13.8 mm and 16.5 mm, which helps to shorten the length of the optical lens 10 and reduce the assembly difficulty of the reflector assembly 20. It is understood that since the axial distance between the first reflector 21 and the second reflector 22 affects the size of the field of view (FOV), and thus the image height of the optical system corresponding to the FOV, this application can control the axial distance between them to achieve a vertical field of view (i.e., the field of view in the vertical direction) between 75° and 95°, thereby making the image height corresponding to the maximum angle reach 4.6 mm.

[0110] It is worth noting that the object-side surfaces of the second lens 112, the fourth lens 114, the fifth lens 115, and the sixth lens 116 can each be either convex or concave; the image-side surface of the sixth lens 116 can be either planar or concave. Furthermore, the first lens 111, the fifth lens 115, and the sixth lens 116 can each be implemented as aspherical lenses, wherein the surface shape of the aspherical surface in the aspherical lens satisfies the following relationship:

[0111]

[0112] In the formula: Z is the sag of a point on the aspherical surface along the optical axis; c is the radius of curvature of the aspherical surface; A, B, C, D, E, F and G are the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth order coefficients of the aspherical surface, respectively; r is the distance from a point on the aspherical surface to the optical axis; k is the quadratic surface constant of the aspherical surface.

[0113] Furthermore, the photosensitive component 30 mentioned in this application may include, but is not limited to, a photosensitive chip and a circuit board, as long as it can receive light modulated by the optical lens 10 for imaging. This application will not elaborate further on this.

[0114] The following describes some specific, non-limiting examples of embodiments of this application in more detail with reference to the accompanying drawings. It should be noted that in the following examples, the radius of curvature R is Infinity, meaning the surface is a plane; " / " indicates that it does not exist. For ease of description, in the following examples: S1 represents the reflecting surface of the second mirror 22; S2 represents the reflecting surface of the first mirror 21; S3 represents the virtual surface; S4 represents the aperture surface; S5 represents the object-side surface of the first lens 111; S6 represents the cemented surface of the first lens 111 and the second lens 112; S7 represents the image-side surface of the second lens 112; S8 ​​and S9 represent the object-side and image-side surfaces of the third lens 113, respectively; S10 and S11 represent the object-side and image-side surfaces of the fourth lens 114, respectively; S12 and S13 represent the object-side and image-side surfaces of the fifth lens 115, respectively; S14 and S15 represent the object-side and image-side surfaces of the sixth lens 116, respectively; S16 and S17 represent the object-side and image-side surfaces of the filter 12, respectively; S18 represents the image surface.

[0115] Example 1

[0116] like Figures 1 to 3E As shown, the optical lens 10 and the imaging detection system of Example 1 are described. Figure 1 A schematic diagram of the optical path of the imaging detection system in Example 1 is shown; Figure 2 A schematic diagram of the structure of the optical lens 10 in Example 1 is shown.

[0117] Specifically, in Example 1, the imaging detection system sequentially includes a second reflecting mirror 22, a first reflecting mirror 21, a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116, a filter 12, and a photosensitive component 30 along the optical path. More specifically, in Example 1: the back focal length (BFL) of the optical lens 10 is 4 mm; the total length (TTL) of the optical lens 10 is 25.6 mm; the vertical field of view of the imaging detection system is 188°; and the image height (h) of the imaging detection system is 4.6 mm.

[0118] Based on the relationships above, Tables 1 and 2 show the design data for the imaging detection system in Example 1.

[0119] Table 1 shows the basic optical parameters of the imaging detection system in Example 1, where the radius of curvature (R value), thickness, refractive index Nd, and Abbe number Vd of each functional surface are specifically shown in Table 1.

[0120] Table 1: Basic Optical Parameters of the Imaging Detection System in Example 1

[0121]

[0122]

[0123] Table 2 shows the higher-order coefficients of some aspherical functional surfaces in the imaging detection system of Example 1, as detailed in Table 2.

[0124] Table 2 shows the aspheric coefficients of some functional surfaces in the imaging detection system of Example 1.

[0125] S1 -2.853 0 0 0 0 0 S10 3.3139 2.047035E-002 1.357263E-002 -2.193455E-003 1.980564E-003 3.976788E-004 S11 47.3353 9.249162E-003 -1.171512E-003 -1.836627E-004 2.157177E-004 4.4714409E-005 S12 -73.56 8.704754E-003 -1.006899E-003 -7.051051E-004 -3.986710E-004 -3.871672E-006 S13 -1.5156 3.408630E-002 2.084778E-003 -8771956E-004 -1.413933E-004 1.724062E-005

[0126] Simulation tests showed that the light spot array of the imaging detection system in Example 1 was as follows: Figure 3A As shown; the MTF (resolution) curve of the imaging detection system in Example 1 is as follows. Figure 3B As shown; the field curvature curve of the imaging detection system in Example 1 is as follows. Figure 3C As shown; the distortion curve of the imaging detection system in Example 1 is as follows. Figure 3D As shown; the color difference curve of the imaging detection system in Example 1 is as follows. Figure 3E As shown. According to Figures 3A to 3E As can be seen, the imaging detection system in Example 1 can achieve good imaging quality.

[0127] Example 2

[0128] like Figures 4 to 6E As shown, the optical lens 10 and imaging detection system of Example 2 are described. Figure 4 A schematic diagram of the optical path of the imaging detection system in Example 2 is shown; Figure 5A schematic diagram of the structure of the optical lens 10 in Example 2 is shown.

[0129] Specifically, in Example 2, the imaging detection system sequentially includes a second reflecting mirror 22, a first reflecting mirror 21, a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116, a filter 12, and a photosensitive component 30 along the optical path. More specifically, in Example 2: the back focal length (BFL) of the optical lens 10 is 1.1 mm; the total length (TTL) of the optical lens 10 is 26.46 mm; the vertical field of view of the imaging detection system is 190°; and the image height (h) of the imaging detection system is 4.6 mm.

[0130] Based on the relationships above, Tables 3 and 4 show the design data for the imaging detection system in Example 2.

[0131] Table 3 shows the basic optical parameters of the imaging detection system in Example 2, where the radius of curvature (R value), thickness, refractive index Nd, and Abbe number Vd of each functional surface are specifically shown in Table 3.

[0132] Table 3: Basic Optical Parameters of the Imaging Detection System in Example 2

[0133] S1 3.94 -11.71 / / S2 Infinity 12.31 / / S3 Infinity 1.70 / / Stop Infinity 0.10 / / S5 4.86 1.02 1.92 37.1 S6 -10.62 0.85 1.52 63.4 S7 9.38 0.76 S8 -4.13 2.00 1.92 18.89 S9 8.73 0.36 S10 24.95 2.00 1.82 46.55 S11 -3.83 0.10 S12 6.96 1.90 1.7 56.2 S13 -37.51 0.10 S14 9.91 1.10 1.82 46.56 S15 13.61 1.10 S16 unlimited 0.60 1.52 64.1 S17 unlimited 0.40 S18 unlimited 0.00

[0134] Table 4 shows the higher-order coefficients of some aspherical functional surfaces in the imaging detection system of Example 2, as detailed in Table 4.

[0135] Table 4 shows the aspherical coefficients of some functional surfaces in the imaging detection system of Example 2.

[0136] S1 -2.912 0 0 0 0 0 S10 0 2.048168E-03 -4.875484E-06 -3.586193E-05 2.157334E-06 0 S11 0 3.153175E-03 2.995886E-04 -7.183431E-06 -3.306440E-07 0 S12 -23.56 4.704754E-003 -3.006599E-003 -5.001051E-004 -4.980710E-004 -2.801272E-006 S13 -5.5156 5.408630E-002 3.081778E-003 -2.711956E-004 -2.453133E-004 2.324012E-005

[0137] Simulation tests showed that the light spot array of the imaging detection system in Example 2 was as follows: Figure 6A As shown; the MTF (resolution) curve of the imaging detection system in Example 2 is as follows. Figure 6B As shown; the field curvature curve of the imaging detection system in Example 2 is as follows. Figure 6C As shown; the distortion curve of the imaging detection system in Example 2 is as follows. Figure 6D As shown; the color difference curve of the imaging detection system in Example 2 is as follows. Figure 6E As shown. According to Figures 6A to 6E As can be seen, the imaging detection system in Example 2 can achieve good imaging quality.

[0138] Example 3

[0139] like Figures 7 to 9E As shown, the optical lens 10 and the imaging detection system of Example 3 are described. Figure 7 A schematic diagram of the optical path of the imaging detection system in Example 2 is shown; Figure 8 A schematic diagram of the structure of the optical lens 10 in Example 2 is shown.

[0140] Specifically, in Example 3, the imaging detection system sequentially includes a second reflecting mirror 22, a first reflecting mirror 21, a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116, a filter 12, and a photosensitive component 30 along the optical path. More specifically, in Example 3: the back focal length (BFL) of the optical lens 10 is 1.79 mm; the total length (TTL) of the optical lens 10 is 34.18 mm; the vertical field of view of the imaging detection system is 190°; and the image height (h) of the imaging detection system is 4.6 mm.

[0141] Based on the relationships above, Tables 5 and 6 show the design data for the imaging detection system of Example 3.

[0142] Table 5 shows the basic optical parameters of the imaging detection system in Example 3, where the radius of curvature (R value), thickness, refractive index Nd, and Abbe number Vd of each functional surface are specifically shown in Table 5.

[0143] Table 5: Basic Optical Parameters of the Imaging Detection System in Example 3

[0144] S1 5.12 -15.2 / / S2 Infinity 16.00 / / S3 Infinity 2.21 / / Stop Infinity 0.13 / / S5 6.31 1.33 1.92 49.1 S6 -13.81 1.10 1.52 63.4 S7 12.19 0.98 S8 -5.37 2.60 1.92 18.86 S9 11.34 0.47 S10 32.44 2.60 1.82 46.59 S11 -4.98 0.13 S12 9.05 2.46 1.7 56.2 S13 -48.76 0.13 S14 12.88 1.43 1.82 46.56 S15 17.70 1.79 S16 Infinity 0.4 1.52 64.1 S17 Infinity 0.4 / / S18 Infinity 0 / /

[0145] Table 6 shows the higher-order coefficients of some aspherical functional surfaces in the imaging detection system of Example 3, as detailed in Table 6.

[0146] Table 6 shows the aspherical coefficients of some functional surfaces in the imaging detection system of Example 3.

[0147] S1 -2.953 0 0 0 0 0 S10 -5.39 9.322567E-04 -1.313110E-06 -5.715184E-06 2.034358E-07 0 S11 37.13 1.435218E-03 8.068793E-05 -1.144797E-06 -3.117960E-08 0 S12 -43.56 6.204654E-003 -1.006899E-003 -4.051551E-004 -1.386110E-004 0 S13 -1.56 5.421630E-002 1.081738E-003 -6.711926E-004 -2.463233E-004 0

[0148] Simulation tests showed that the light spot array of the imaging detection system in Example 3 was as follows: Figure 9A As shown; the MTF (resolution) curve of the imaging detection system in Example 3 is as follows. Figure 9B As shown; the field curvature curve of the imaging detection system in Example 3 is as follows. Figure 9C As shown; the distortion curve of the imaging detection system in Example 3 is as follows. Figure 9D As shown; the color difference curve of the imaging detection system in Example 3 is as follows. Figure 9E As shown. According to Figures 9A to 9E As can be seen, the imaging detection system in Example 3 can achieve good imaging quality.

[0149] In summary, the imaging detection systems in Examples 1, 2, and 3 satisfy the relationships shown in Table 7, as detailed in Table 7.

[0150] Table 7: Relationships Satisfying the Imaging Detection System

[0151]

[0152] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An optical lens, characterized in that, include: A lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially from the object side to the image side along the optical axis; the first lens has positive optical power, and its object-side and image-side surfaces are convex and concave, respectively; the second lens has optical power, and its image-side surface is convex; the third lens has negative optical power, and both its object-side and image-side surfaces are concave; the fourth lens has positive optical power, and its image-side surface is convex; the fifth lens has positive optical power, and its image-side surface is convex; the sixth lens has optical power; the first lens and the second lens are cemented together to form a cemented lens; and A filter is disposed coaxially on the image side of the sixth lens.

2. The optical lens according to claim 1, characterized in that, The third lens and the fourth lens are aspherical lenses.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 4 < (f3 + f4) / f < 8; Where f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; and f is the total focal length of the optical lens.

4. The optical lens according to claim 1, characterized in that, The third lens, the fourth lens, and the fifth lens satisfy the following relationship: 0.1 < (f3 + f4) / f5 < 0.3; Wherein, f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; and f5 is the focal length of the fifth lens.

5. The optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, and the fourth lens satisfy the following relationship: -3 < (R1 + R3) / (R4 + R7) < -1; Wherein, R1 is the radius of curvature of the object-side surface of the first lens; R3 is the radius of curvature of the image-side surface of the second lens; R4 is the radius of curvature of the object-side surface of the third lens; and R7 is the radius of curvature of the image-side surface of the fourth lens.

6. The optical lens according to claim 1, characterized in that, The bandpass wavelength of the filter is greater than or equal to 430 nm and less than or equal to 650 nm.

7. The optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy the following relationship: 0.9<(Nd1+Nd2+Nd3) / (Nd4+Nd5+Nd6)≤1; Wherein, Nd1 is the refractive index of the first lens; Nd2 is the refractive index of the second lens; Nd3 is the refractive index of the third lens; Nd4 is the refractive index of the fourth lens; Nd5 is the refractive index of the fifth lens; and Nd6 is the refractive index of the sixth lens.

8. The optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy the following relationship: 0.7<(Vd1+Vd2+Vd3) / (Vd4+Vd5+Vd6)<2; Wherein, Vd1 is the Abbe number of the first lens; Vd2 is the Abbe number of the second lens; Vd3 is the Abbe number of the third lens; Vd4 is the Abbe number of the fourth lens; Vd5 is the Abbe number of the fifth lens; and Vd6 is the Abbe number of the sixth lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.03 < BFL / TTL < 0.2; Wherein, BFL is the back focal length of the optical lens; TTL is the total length of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 6 ≤ FOV*f / h ≤ 17.5; Wherein, FOV is the maximum field of view of the optical lens; f is the total focal length of the optical lens; and h is the image height of the optical lens.

11. An imaging detection system, characterized in that, include: The optical lens as described in any one of claims 1 to 10; A photosensitive component, which is correspondingly disposed on the image side of the optical lens; as well as A mirror assembly, which is correspondingly disposed on the object side of the optical lens.

12. The imaging detection system according to claim 11, characterized in that, The mirror assembly consists of a first mirror and a second mirror; the first mirror is coaxially disposed on the object side of the optical lens; The second reflector is fitted around the optical lens and is used to reflect the object light so that it can be transmitted to the first reflector; The first reflector is used to reflect the object light from the second reflector to propagate to the optical lens.

13. The imaging detection system according to claim 12, characterized in that, The first reflector is a plane reflector spaced apart from the optical lens; the second reflector is a parabolic reflector with a central light-passing aperture.

14. The imaging detection system according to claim 13, characterized in that, The diameter of the central light-transmitting hole of the parabolic reflector is between 4 mm and 8 mm.

15. The imaging detection system according to claim 12, characterized in that, The effective aperture of the first reflector is between 35mm and 40mm.

16. The imaging detection system according to claim 12, characterized in that, The axial distance between the first reflector and the second reflector is between 13.8 mm and 16.5 mm.

Images