Large-aperture glass-plastic mixed side-looking ADAS optical imaging system for automobile auxiliary driving

Abstract

The invention provides an automobile auxiliary driving large aperture glass plastic mixed side view ADAS optical imaging system. The optical imaging system sequentially comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an optical filter, protective glass and an image plane from an object plane to an image plane along an optical axis. The curvature radiuses of the object side surfaces and the image side surfaces of the second lens and the seventh lens are limited, so that the influence of the temperature on the focal length of the plastic lens can be reduced, the focal length change rate of the lens group at high and low temperatures is less than 0.1%, the stable magnification is ensured, a reliable operation basis is provided for an algorithm, and the stability and the reliability of product performance are greatly improved; according to the invention, the aperture can reach F1.4, even in a low-illumination environment, the vehicle can also start a sentry monitoring function; the second lens and the seventh lens are respectively made of materials with high Tg values, so that the performance of the product in a high-temperature state is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving. Background Art

[0002] With the increase in car ownership and rising demands for driving safety and convenience, assisted driving systems (ADS) have garnered widespread attention and are rapidly developing. As a key component of assisted driving systems, side-view cameras provide drivers with real-time information about the vehicle's side, helping them better understand their surroundings, reducing blind spots, and improving driving safety. They play a crucial role in situations such as merging, turning, and parking. Early side-view systems relied primarily on traditional rearview mirrors, but these mirrors have certain blind spots and can easily obstruct vision in inclement weather. With the continuous advancement of camera and image processing technologies, side-view cameras for assisted driving have gradually gained popularity. Initial side-view cameras had low resolution and a limited field of view, providing only blurry images of the vehicle's side. Today, high-resolution, wide-field-of-view side-view cameras, along with advanced image sensors and image processing algorithms, are widely used. These cameras can capture clear and accurate information about the vehicle's side environment in real time. Through image stitching and distortion correction, they provide drivers with more comprehensive and intuitive visual assistance.

[0003] However, most current side-view lenses have the following problems: their cost remains high, and most are all-glass 7G or 5G1GM structures; if plastic lenses are used to reduce lens costs, the imaging of plastic lenses will be unstable in high and low temperature environments, resulting in a decrease in lens imaging quality in extreme environments, affecting the driver's driving experience. Summary of the Invention

[0004] The present invention proposes a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving. This large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving has the characteristics of low cost, large aperture, athermalization, and the second lens and the seventh lens are made of high TG temperature materials to ensure reliability at high and low temperatures.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving, which comprises, along the optical axis, from the object plane to the image plane, the following components: a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter, a protective glass, and an image plane; The first lens of the optical imaging system is a meniscus lens with a negative optical power; the second lens is a concave-convex lens with a positive optical power; the third lens is a biconvex lens with a positive optical power; the fourth lens is a biconvex lens with a positive optical power; the fifth lens is a concave-convex lens with a positive optical power; the sixth lens is a biconvex lens with a negative optical power; the seventh lens is an M-shaped lens with a negative optical power; Among them, the ratio of the focal lengths of the first lens to the seventh lens of the optical imaging system to the focal length of the optical imaging system satisfies the following set relationship: -2.3 < f1 / f < -1.2, 114.3 < f2 / f < 115.4, 4.2 < f3 / f < 5.2, 3.9 < f4 / f < 5.1, 35.1 < f5 / f < 36.2, -93.2 < f6 / f < -92.1, -69.2 < f7 / f < -68.1; where f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, f7 represents the effective focal length of the seventh lens, and f represents the effective focal length of the optical imaging system.

[0006] A further solution is that the refractive indices of the first lens to the seventh lens satisfy the following conditions: 1.78 < n1 < 1.87; 1.62 < n2 < 1.66; 1.83 < n3 < 1.94; 1.53 < n4 < 1.63; 1.91 < n5 < 1.99; 1.62 < n6 < 1.72; 1.52 < n7 < 1.56. Among them, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, and n7 is the refractive index of the seventh lens.

[0007] A further solution is that the interval L2 between the second lens and the third lens, the interval L3 between the third lens and the fourth lens, and the interval L6 between the sixth lens and the seventh lens of the optical imaging system satisfy: 0.1 < (L2 + L3 + L6) / 3 < 0.4.

[0008] A further solution is that the curvature radius R3 of the object side surface of the second lens of the optical imaging system and the curvature radius R4 of the image side surface of the second lens, and the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the second lens satisfy: 0.5 < R3 - R4 < 1.5, 1.0 < R13 - R14 < 2.0.

[0009] A further solution is that an entrance pupil diameter EPD of the optical imaging system and a maximum holographic image height IH of the optical imaging system satisfy: 0.05<EPD / IH<0.15.

[0010] A further solution is that the optical imaging system adopts a 5G+2P design, and the second lens and the seventh lens are both made of EP6000 / T62R plastic material.

[0011] A further solution is that the aperture of the optical imaging system is: F / NO=1.4.

[0012] A further solution is that the effective focal length f of the optical imaging system satisfies the following condition: 2.97 mm ≤ f ≤ 3.28 mm.

[0013] A further solution is that the aperture ST0 of the optical imaging system is arranged between the second lens E2 and the third lens E3.

[0014] A further solution is that the first lens has a convex surface facing the object side and a concave surface facing the image side; the second lens has a concave surface facing the object side and a convex surface facing the image side; the third lens has a convex surface facing the object side and a convex surface facing the image side, and the absolute value of the curvature radius of the surface of the third lens facing the object side is greater than the absolute value of the curvature radius of the surface of the third lens facing the image side; the fourth lens has a convex surface facing the object side and a convex surface facing the image side, and the fourth lens has a convex surface facing the object side and a convex surface facing the image side, and the fourth lens has a convex surface facing the object side and a convex surface facing the image side. The absolute value of the radius of curvature of a surface facing the object side of the sixth lens is smaller than the absolute value of the radius of curvature of a surface facing the image side of the fourth lens; the surface of the fifth lens facing the object side is convex, and the surface facing the image side is concave; the surface of the sixth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the radius of curvature of a surface of the sixth lens facing the object side is smaller than the absolute value of the radius of curvature of a surface of the sixth lens facing the image side; the seventh lens is an M-type lens, and the surface of the seventh lens facing the object side is convex, and the surface facing the image side is concave.

[0015] To sum up, the present invention has the following beneficial effects: The present invention provides a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving, and in particular relates to a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving that takes into account the characteristics of low cost, athermalization, and the second lens and the seventh lens using high TG temperature materials to ensure reliability under high and low temperatures. The lens includes a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter, a protective glass and an image plane arranged in the direction from the object side to the image side. The present invention adopts a 5G+2P structural design and designs an automotive side-view lens in a cost-effective manner, which has more cost advantages than the all-glass 7G or 5G1GM structures on the market; the present invention reduces the influence of temperature on the focal length of the plastic lens by limiting the curvature radius of the second plastic lens and the seventh plastic lens, and the focal length change rate of the lens is less than 0.1% under high and low temperature conditions, ensuring the stability of the magnification in high and low temperature environments, providing a reliable operating basis for the algorithm, and greatly improving the stability and reliability of product performance; the lens adopts an athermal design to achieve thermal drift compensation, and the operating temperature can be from -40 to 105°, greatly improving the application of the product in complex temperature scenarios; the aperture of the present invention can reach F / NO1.4, even in low-light environments, the vehicle can activate the sentry monitoring function; the second lens and the seventh lens are specially selected from high-Tg value materials such as EP6000 and T62R, which greatly improves the performance of the product under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of an optical imaging system provided in an embodiment of the present invention; Figure 2 This is an MTF analysis diagram of the optical imaging system provided by an embodiment of the present invention at visible light 20°C; Figure 3 A defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at 20°C visible light; Figure 4 A defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at -40°C visible light; Figure 5 A defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at 105°C visible light; Figure 6 An F-THETA distortion diagram of the optical imaging system in visible light provided by an embodiment of the present invention; Figure 7 A relative illumination diagram of the optical imaging system in visible light provided by an embodiment of the present invention; Figure 8 A diagram of field curvature in visible light of the optical imaging system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0020] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] like Figure 1 As shown, the present invention provides a large-aperture glass-plastic hybrid side-view ADAS optical imaging system for assisted driving. Along the optical axis, from the object plane to the image plane, the following components are arranged: first lens E1, second lens E2, aperture ST0, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter IR, cover glass CG, and image plane IMA. Second lens E2 and seventh lens E7 are plastic lenses, while the others are glass lenses.

[0022] In a specific implementation, the first lens E1 of the optical imaging system is a meniscus lens with negative optical power; the second lens E2 is a meniscus lens with positive optical power; the third lens E3 is a biconvex lens with positive optical power; the fourth lens E4 is a biconvex lens with positive optical power; the fifth lens E5 is a meniscus lens with positive optical power; the sixth lens E6 is a biconvex lens with negative optical power; and the seventh lens E7 is an M-type lens with negative optical power. The M-type lens is conducive to adjusting the optical path in a limited space, which can not only meet the miniaturization of the lens, but also disperse the stress of the lens during use while ensuring optical performance, reduce the risk of deformation, and maintain the stability of optical performance.

[0023] The ratio of the focal lengths of the first lens E1 to the seventh lens E7 of the optical imaging system to the focal length of the optical imaging system satisfies the following set relationship: -2.3<f1 / f<-1.2, 114.3<f2 / f<115.4, 4.2<f3 / f<5.2, 3.9<f4 / f<5.1, 35.1<f5 / f<36.2, -93.2<f6 / f<-92.1, -69.2<f7 / f<-68.1; wherein f1 represents the effective focal length of the first lens E1, f2 represents the effective focal length of the second lens E2, f3 represents the effective focal length of the third lens E3, f4 represents the effective focal length of the fourth lens E4, f5 represents the effective focal length of the fifth lens E5, f6 represents the effective focal length of the sixth lens E6, f7 represents the effective focal length of the seventh lens E7, and f represents the effective focal length of the optical imaging system. By rationally allocating the focal length of each lens within a limited range, aberrations such as spherical aberration and chromatic aberration can be effectively controlled, thereby significantly improving the clarity, sharpness, and color reproduction of the image, achieving a realistic imaging effect with consistent high resolution from the center to the edge of the field of view.

[0024] A further solution is that the refractive indices of the first lens E1 to the seventh lens E7 satisfy the following conditions: 1.78 < n1 < 1.87; 1.62 < n2 < 1.66; 1.83 < n3 < 1.94; 1.53 < n4 < 1.63; 1.91 < n5 < 1.99; 1.62 < n6 < 1.72; 1.52 < n7 < 1.56. Here, n1 is the refractive index of the first lens E1, n2 is the refractive index of the second lens E2, n3 is the refractive index of the third lens E3, n4 is the refractive index of the fourth lens E4, n5 is the refractive index of the fifth lens E5, n6 is the refractive index of the sixth lens E6, and n7 is the refractive index of the seventh lens E7. Meeting the above ranges enables the first lens E1, the third lens E3, and the fifth lens E5 to all use high-refractive-index glass, which can accurately control the deflection angle of incident light, effectively suppress vignetting, and increase the light flux. At the same time, the optical path is optimized to reduce the light loss caused by edge obstruction, ensuring uniform illuminance from the center to the edge of the field of view, thereby improving the overall imaging quality.

[0025] Preferably, the interval L2 between the second lens E2 and the third lens E3, the interval L3 between the third lens E3 and the fourth lens E4, and the interval L6 between the sixth lens E6 and the seventh lens E7 of the optical imaging system satisfy: 0.1 mm < (L2 + L3 + L6) / 3 < 0.4 mm. It should be noted that a smaller lens interval can suppress higher-order aberrations. When the propagation distance of light between lenses is small, the degree of deviation from the ideal path is more easily controlled by subsequent lenses, which is beneficial to the stability of the optical path and the miniaturization of the optical imaging system.

[0026] Preferably, the curvature radius R3 of the object side surface of the second lens E2 and the curvature radius R4 of the image side surface of the second lens E2, and the curvature radius R13 of the object side surface of the seventh lens E7 and the curvature radius R14 of the image side surface of the seventh lens E7 of the optical imaging system satisfy: 0.5 mm < R3 - R4 < 1.5 mm, 1.0 mm < R13 - R14 < 2.0 mm. By limiting the curvature radii of the second lens and the seventh lens in the present invention, the influence of temperature on the focal length of the plastic lens is reduced, and the focal length change rate of the lens group at high and low temperatures < 0.1%, ensuring the stability of the magnification ratio, providing a reliable operating basis for the algorithm, and greatly improving the stability and reliability of the product performance.

[0027] Preferably, the entrance pupil diameter EPD of the optical imaging system and the maximum full-image height IH of the optical imaging system satisfy: 0.05 < EPD / IH < 0.15. Meeting the above range can ensure that while the optical imaging system has a large target surface, a large-aperture structure design can also be achieved. Even in a low-illumination environment, the vehicle can activate the sentry monitoring function.

[0028] Preferably, the optical imaging system utilizes a 5G+2P design, comprising five glass spherical lenses and two plastic lenses. Both the second lens element E2 and the seventh lens element E7 are constructed from EP6000 / T62R plastic, a material with a high Tg (glass transition temperature). This combination of glass and plastic optimizes the optical imaging system's thermal drift compensation, ensuring imaging stability in both high and low-temperature environments. The higher the Tg value, the less likely the lens is to deform in high-temperature environments. Using a high-Tg plastic prevents deformation caused by the metal lens barrel squeezing the plastic lens in high-temperature environments, significantly improving product performance in high-temperature conditions. Furthermore, the 5G+2P design offers a cost advantage over existing all-glass 7G or 5G1GM structures.

[0029] Preferably, in the above optical imaging system provided by the embodiment of the present invention, the aperture of the optical imaging system is: F / NO=1.4.

[0030] Preferably, in the above optical imaging system provided by the embodiment of the present invention, the effective focal length f of the optical imaging system satisfies the following condition: 2.97 mm ≤ f ≤ 3.28 mm.

[0031] Preferably, in the optical imaging system provided by the embodiment of the present invention, the aperture ST0 of the optical imaging system is disposed between the second lens E2 and the third lens E3.

[0032] Preferably, a surface S1 of the first lens E1 facing the object side is convex, and a surface S2 facing the image side is concave; a surface S3 of the second lens E2 facing the object side is concave, and a surface S4 facing the image side is convex; a surface S5 of the third lens E3 facing the object side is convex, and a surface S7 facing the image side is convex, and the absolute value of the curvature radius of the surface S5 of the third lens E3 facing the object side is greater than the absolute value of the curvature radius of the surface S7 of the third lens E3 facing the image side; a surface S8 of the fourth lens E4 facing the object side is convex, and a surface S9 facing the image side is convex, and the absolute value of the curvature radius of the surface S8 of the fourth lens E4 facing the object side is less than The absolute value of the radius of curvature of a surface S9 of the fourth lens E4 facing the image side is less than the absolute value of the radius of curvature of a surface S12 of the sixth lens E6 facing the image side; the fifth lens E5 has a convex surface S10 facing the object side, and a concave surface S11 facing the image side; the sixth lens E6 has a convex surface S11 facing the object side, and a convex surface S12 facing the image side, and the absolute value of the radius of curvature of the surface S11 of the sixth lens E6 facing the object side is smaller than the absolute value of the radius of curvature of the surface S12 of the sixth lens E6 facing the image side; the seventh lens E7 is an M-type lens, and the object side surface S13 of the seventh lens E7 is convex, and the image side surface S14 is concave; the fifth lens E5 and the sixth lens E6 constitute a cemented lens.

[0033] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0034] The parameters of the lenses of this embodiment are listed in Table 1 below, and the aspheric coefficients of the lenses are listed in Table 2 below.

[0035] Table 1 Physical parameters of each lens

[0036] Table 2 Lens aspheric coefficients

[0037]

[0038] The aspheric coefficients satisfy the following equation:

[0039] Among them, z is the aspheric surface sag, c is the aspheric surface paraxial curvature, y is the lens aperture, k is the cone coefficient, a4 is the 4th aspheric coefficient, a6 is the 6th aspheric coefficient, a8 is the 8th aspheric coefficient, a10 is the 10th aspheric coefficient, a12 is the 12th aspheric coefficient, a14 is the 14th aspheric coefficient, and a16 is the 16th aspheric coefficient.

[0040] Specifically, the R value and thickness of each lens surface in this embodiment are shown in Table 1, and the aspheric surface parameters are shown in Table 2.

[0041] Specifically, the R value (radius of curvature), thickness, refractive index, Abbe coefficient (ABB), and lens focal length (EFL-E) of each lens surface in this embodiment are shown in Table 1, and the aspheric surface parameters are shown in Table 2. In Table 1, "Surf" represents the mirror surface number, and "Infinity" represents infinity. In Table 2, "R1" represents the radius of curvature of the corresponding lens surface facing the object side, and "R2" represents the radius of curvature of the corresponding lens surface facing the image side. A positive radius of curvature indicates that the mirror surface is curved toward the object side, while a negative radius of curvature indicates that the mirror surface is curved toward the image side.

[0042] The optical imaging system provided in Table 1 has an effective focal length of 3.13 mm, a maximum total image height of 7.39 mm, and an aperture F / NO of 1.4. In Table 1, surface numbers 1 and 2 represent, respectively, the two surfaces of the first lens element E1 along the direction of incident light; surface numbers 3 and 4 represent, respectively, the two surfaces of the second lens element E2 along the direction of incident light; surface numbers 6 and 7 represent, respectively, the two surfaces of the third lens element E3 along the direction of incident light; surface numbers 8 and 9 represent, respectively, the two surfaces of the fourth lens element E4 along the direction of incident light; surface number 10 represents the object-facing surface of the fifth lens element E5; surface number 11 represents the cemented surface of the fifth lens element E5 and the sixth lens element E6; surface number 12 represents the image-facing surface of the sixth lens element E6; and surface numbers 13 and 14 represent, respectively, the two surfaces of the seventh lens element E7 along the direction of incident light.

[0043] In an embodiment of the present invention, Figure 2 The modulation transfer function (MTF) curve for the visible light band represents the comprehensive resolution capability of the optical imaging system. The horizontal axis represents the spatial frequency (cycles / mm), and the vertical axis represents the modulation transfer function (MTF) value. The MTF value is used to evaluate the imaging quality of the lens, and the value range is 0-1. It is particularly pointed out that the optical transfer function is a relatively accurate, intuitive and common way to evaluate the imaging quality of an optical imaging system. The higher and smoother the curve is, the better the imaging quality of the system is and the stronger the ability to restore the real image is. Figure 2 It can be seen that the MTF of the imaging area near the center of the visible light band is greater than 0.7, and the imaging quality is good. Figure 3 From the defocus curve, we can see that the MTF concentration of this lens is good, which makes focusing easy. Figure 4 and Figure 5 It can be seen that the defocus curves at both high and low temperatures meet high resolution, the focus change of the defocus curve is small, and there is no defocus in high and low temperature environments; Figure 6 It is expressed as F-THETA distortion diagram. The smaller the F-THETA distortion, the smaller the compression of the image edge. Figure 7 It is represented as the relative illumination diagram of the optical lens. The higher the relative illumination, the higher the overall brightness of the captured image. Figure 8 It can be seen that the field curvature value is controlled between -0.05mm and 0.05mm. The smaller the field curvature value, the better the imaging quality of the lens.

Claims

1. An automotive assisted driving large-aperture glass-plastic hybrid side-view ADAS optical imaging system, characterized in that: Along the optical axis, from the object plane to the image plane, it successively includes: a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter, a protective glass, and an image plane; The first lens of the optical imaging system is a meniscus lens with a negative optical power; the second lens is a convex-concave lens with a positive optical power; the third lens is a biconvex lens with a positive optical power; the fourth lens is a biconvex lens with a positive optical power; the fifth lens is a convex-concave lens with a positive optical power; the sixth lens is a biconvex lens with a negative optical power; the seventh lens is an M-shaped lens with a negative optical power; Among them, the second lens and the seventh lens of the optical imaging system are plastic lenses, and the curvature radius R3 of the object side of the second lens, the curvature radius R4 of the image side of the second lens, the curvature radius R13 of the object side of the seventh lens, and the curvature radius R14 of the image side of the second lens satisfy: 0.5 < R3 - R4 < 1.5, 1.0 < R13 - R14 < 2.

0.

2. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The refractive indices of the first lens to the seventh lens satisfy the following conditions: 1.78 < n1 < 1.87; 1.62 < n2 < 1.66; 1.83 < n3 < 1.94; 1.53 < n4 < 1.63; 1.91 < n5 < 1.99; 1.62 < n6 < 1.72; 1.52 < n7 < 1.56 Among them, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, and n7 is the refractive index of the seventh lens.

3. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The intervals L2 between the second lens and the third lens, L3 between the third lens and the fourth lens, and L6 between the sixth lens and the seventh lens of the optical imaging system satisfy: 0.1 < (L2 + L3 + L6) / 3 < 0.

4.

4. An automotive assisted driving large-aperture glass-plastic hybrid side-view ADAS optical imaging system according to claim 1, characterized in that: The ratio of the focal lengths of the first lens to the seventh lens of the optical imaging system to the focal length of the optical imaging system satisfies the following set relationship: -2.3 < f1 / f < -1.2, 114.3 < f2 / f < 115.4, 4.2 < f3 / f < 5.2, 3.9 < f4 / f < 5.1, 35.1 < f5 / f < 36.2, -93.2 < f6 / f < -92.1, -69.2 < f7 / f < -68.1; Where f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, f7 represents the effective focal length of the seventh lens, and f represents the effective focal length of the optical imaging system.

5. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The entrance pupil diameter EPD of the optical imaging system and the maximum holographic height IH of the optical imaging system satisfy the following: 0.05<EPD / IH<0.

15.

6. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The optical imaging system adopts a 5G+2P design, and the second lens and the seventh lens are both made of EP6000 / T62R plastic material.

7. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The aperture of the optical imaging system is: F / NO=1.

4.

8. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The effective focal length f of the optical imaging system satisfies the following condition: 2.97 mm ≤ f ≤ 3.28 mm.

9. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The aperture of the optical imaging system is arranged between the second lens and the third lens.

10. The large aperture glass-plastic hybrid side-view ADAS optical imaging system for automobile assisted driving according to claim 1, characterized in that: The first lens has a convex surface facing the object side and a concave surface facing the image side; the second lens has a concave surface facing the object side and a convex surface facing the image side; the third lens has a convex surface facing the object side and a convex surface facing the image side, and the absolute value of the curvature radius of the surface of the third lens facing the object side is greater than the absolute value of the curvature radius of the surface of the third lens facing the image side; the fourth lens has a convex surface facing the object side and a convex surface facing the image side, and the surface of the fourth lens facing the object side is The absolute value of the radius of curvature of the surface of the sixth lens facing the object side is smaller than the absolute value of the radius of curvature of the surface of the fourth lens facing the image side; the surface of the fifth lens facing the object side is convex, and the surface facing the image side is concave; the surface of the sixth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the radius of curvature of the surface of the sixth lens facing the object side is smaller than the absolute value of the radius of curvature of the surface of the sixth lens facing the image side; the seventh lens is an M-type lens, and the surface of the seventh lens facing the object side is convex, and the surface facing the image side is concave.

Images