Ultra-large target surface 4K starlight night vision DVR optical imaging system

Abstract

The invention discloses an ultra-large target surface 4K starlight night vision DVR optical imaging system. The optical imaging system comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, an optical filter, protective glass and an image surface which are sequentially arranged in the direction from the object side to the image side. A 1GM2G5P structure is adopted, a large-target-surface 1 / 1.8 chip can be matched, compared with a traditional 1 / 1.8 chip, the target surface area is remarkably increased, the problem of dark corners occurring when a traditional DVR is matched with the large-target-surface chip is effectively solved, and imaging uniformity and definition are improved; meanwhile, the F1.4 large aperture design is adopted, the driving road condition can still be clearly recorded in the dark environment without a street lamp, the night imaging quality is remarkably improved, and the driving safety is enhanced; by means of the thermal temperature drift compensation technology, athermalization design is achieved, the working temperature range is expanded to-40 DEG C to 95 DEG C, the application requirement under the complex temperature environment is met, and the reliability and stability of products are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and particularly to a super-large target surface 4K starlight night vision DVR optical imaging system. Background Art

[0002] With the continuous and astonishing increase in the number of automobiles in use, the road traffic environment has become increasingly complex and intricate. In the streets and alleys of cities, heavy traffic has become the norm, and it is extremely congested during the morning and evening rush hours, with the distance between vehicles being squeezed to a minimum. Car owners with different driving habits gather together. Novice drivers, due to lack of experience, are prone to getting nervous and making mistakes in complex road conditions; while even experienced drivers may occasionally cause accidents due to momentary carelessness. In such an environment, the safety and liability determination during vehicle driving have become increasingly important. Once a traffic accident occurs, the scene is often chaotic, and the liability determination often falls into dispute. Traditional judgment methods rely on the descriptions of eyewitnesses and on-site investigations by traffic police, but these methods have certain limitations and it is difficult to guarantee accuracy. The driving recorder came into being precisely in such a background and has witnessed rapid development with its unique functions and values. It can record the images and sounds during vehicle driving in real time, providing conclusive evidence for the clear division of accident liability, making accident handling more fair and efficient, and also providing a solid and reliable guarantee for the legitimate rights and interests of car owners, and gradually becoming an indispensable part of modern automobiles.

[0003] However, the lenses of current driving recorders on the market generally have problems such as low pixel, insufficiently large target surface, small aperture, and unstable thermal drift. An insufficiently large target surface will cause vignetting problems when the lens is matched with a large target surface chip, thus affecting the imaging effect; a small aperture results in poor imaging quality at night and cannot clearly image in a dark environment; unstable thermal temperature drift cannot meet the application requirements of driving recorders in complex temperature environments. Summary of the Invention

[0004] The present invention proposes a super-large target surface 4K starlight night vision DVR optical imaging system, which takes into account the characteristics of high pixel, large target surface, large aperture, athermalization, and purple fringing optimization.

[0005] A super-large target surface 4K starlight night vision DVR optical imaging system, in sequence from the object surface to the image surface along the optical axis: A first lens made of negative-powered meniscus spherical glass; A second lens made of positive-powered concavo-convex aspherical plastic; A third lens made of negative-powered concavo-convex aspherical plastic; A fourth lens made of positive-powered biconvex aspherical glass; An aperture stop; The fifth lens, which is a biconvex aspherical plastic lens with positive optical power; The sixth lens, which is a biconcave aspherical plastic lens with negative optical power; The seventh lens, which is a biconvex spherical glass lens with positive optical power; The eighth lens, which is an M-type aspherical plastic lens with negative optical power; A filter; The image plane; Wherein, the ratio of the focal lengths of the first lens E1 to the eighth lens E8 to the focal length of the optical system satisfies the following set relationship: -2.1 < f1 / f < -1.1, 3.7 < f2 / f < 4.8, -5.6 < f3 / f < -4.7, 2.1 < f4 / f < 3.1, 2.1 < f5 / f < 3.1, -2.3 < f6 / f < -1.3, 2.2 < f7 / f < 3.2, -29.5 < f8 / f < -28.1; 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, f8 represents the effective focal length of the eighth lens, and f represents the effective focal length of the optical system; Wherein, the effective focal length f of the optical system, the focal length f1 of the first lens, and the focal length f2 of the second lens satisfy: -2.1 < f1 / f < -1.1, 0.8 < f2 / f < 1.9; the effective focal length f8 of the eighth lens satisfies -126 < f8 < -117.

[0006] A further solution is that the following condition is satisfied between the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens: 0.9 < f1 / f6 < 1; The following condition is satisfied between the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens: 0.9 < f4 / f5 < 1.

[0007] A further solution is that the Abbe number of the fourth aspherical glass lens is greater than 60 and less than 70.

[0008] A further solution is that the exit pupil position EXPP and the entrance pupil position ENPP of the optical system satisfy the following condition: 2 < (EXPP - ENPP) / (EXPP + ENPP) < 2.5.

[0009] A further solution is that the entrance pupil diameter EPD of the optical system and the maximum holographic height IH of the optical imaging system satisfy the following condition: 3 < IH / EPD < 4.

[0010] A further solution is that the maximum holographic height IH of the optical imaging system satisfies the following condition: IH ≥ 9.64 mm.

[0011] A further solution is that the maximum field of view angle of the optical imaging system satisfies the following condition: FOV ≥ 148°.

[0012] A further solution is that the aperture of the optical imaging system satisfies the following condition: F / NO = 1.4.

[0013] A further solution is that the effective focal length f of the optical imaging system satisfies the following condition: 4.02 mm ≤ f ≤ 4.12 mm.

[0014] A further solution is that the object side of the first lens is convex and the image side is concave; the object side of the second lens is concave and the image side is convex; the object side of the third lens is concave and the image side is convex; the object side of the fourth lens is slightly convex and the image side is highly convex; the object side of the fifth lens is highly convex and the image side is slightly convex; the object side of the sixth lens is slightly concave and the image side is highly concave; the object side of the seventh lens is slightly convex and the image side is highly convex; the eighth lens is an M-shaped lens, with the object side being convex and the image side being concave.

[0015] In summary, the present invention has the following beneficial effects: (1) The present invention adopts a 1GM2G5P (1 piece of glass aspherical (GM), 2 pieces of spherical glass (G), and 5 pieces of plastic aspherical (P)) structure, which can be matched with a large target surface 1 / 1.8 chip. Compared with the traditional 1 / 2.7 chip, the target surface area is significantly increased, effectively solving the vignetting problem that occurs when the traditional DVR matches a large target surface chip, and improving the imaging uniformity and clarity.

[0016] (2) The present invention adopts a large aperture design of F1.4, which can still clearly record the driving road conditions in a dark environment without street lights, significantly improving the imaging quality at night and enhancing driving safety.

[0017] (3) Through the thermal temperature drift compensation technology, the present invention realizes an athermal design, and the working temperature range is extended to -40°C to 95°C, meeting the application requirements in a complex temperature environment and improving the reliability and stability of the product.

[0018] (4) The present invention adopts a low dispersion glass molded aspherical design, which can optimize the purple fringing phenomenon, improve the picture quality of the lens imaging, and make the image clearer and the color more realistic.

[0019] (5) The present invention can achieve high-definition imaging of 8 million pixels, clearly record the driving road conditions, and provide a strong guarantee for driving safety. Description of the Drawings

[0020] Figure 1 Schematic diagram of the structure of a super-large target surface 4K starlight night vision DVR optical imaging system provided by an embodiment of the present invention; Figure 2 MTF analysis diagram of the optical imaging system provided by an embodiment of the present invention at 20°C in visible light; Figure 3 Defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at 20°C in visible light; Figure 4 Defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at -40°C in visible light; Figure 5 Defocus curve diagram of the optical imaging system provided by an embodiment of the present invention at 95°C in visible light; Figure 6 F-THETA distortion diagram of the optical imaging system provided by an embodiment of the present invention; Figure 7 Field curvature diagram of the optical imaging system provided by an embodiment of the present invention in visible light; Figure 8 Standard spot diagram of the optical imaging system provided by an embodiment of the present invention in visible light.

[0021] Figure 9 Perpendicular differential chromatic aberration diagram of the optical imaging system provided by an embodiment of the present invention at wavelengths of 435 - 656 nm. Detailed implementation manners

[0022] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships 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 thus should not be construed as limiting the present invention.

[0024] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] As Figure 1 shown, the present invention provides a super-large target surface 4K starlight night vision DVR optical imaging system. Along the optical axis direction from the object side to the image side, the optical imaging system includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, an infrared filter IR, a protective glass CG, and an image plane IMA.

[0027] Among them, the first lens E1 is a meniscus spherical glass lens with a negative optical power, and the object surface side S1 is convex, and the image surface side S2 is concave; the second lens E2 is a positive meniscus aspherical plastic lens, and the object surface side S3 is concave, and the image surface side S4 is convex; the third lens E3 is a negative meniscus aspherical plastic lens, and the object surface side S5 is concave, and the image surface side S6 is convex; the fourth lens E4 is a positive biconvex aspherical glass lens, and the object surface side S7 is a small convex surface, and the image surface side S8 is a large convex surface; the fifth lens E5 is a positive biconvex aspherical plastic lens, and the object surface side S10 is a large convex surface, and the image surface side S11 is a small convex surface, the sixth lens E6 is a negative biconcave aspherical plastic lens, and the object surface side S12 is a small concave surface, and the image surface side S13 is a large concave surface; the seventh lens E7 is a positive biconvex spherical glass lens, and the object surface side S14 is a small convex surface, and the image surface side S15 is a large convex surface; the eighth lens E8 is a negative M-shaped aspherical plastic lens, and the object surface side S16 is convex, and the image surface side S17 is concave.

[0028] Among them, the ratio of the focal lengths of the first lens E1 to the eighth lens E8 to the focal length of the optical system satisfies the following set relationship: -2.1 < f1 / f < -1.1, 3.7 < f2 / f < 4.8, -5.6 < f3 / f < -4.7, 2.1 < f4 / f < 3.1, 2.1 < f5 / f < 3.1, -2.3 < f6 / f < -1.3, 2.2 < f7 / f < 3.2, -29.5 < f8 / f < -28.1; where 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, f8 represents the effective focal length of the eighth lens E8, and f represents the effective focal length of the optical system. Meeting the above ranges, by reasonably defining the focal lengths of each lens, the first to fourth lenses successively adopt the optical power of "negative, positive, negative, positive", and the fifth to eighth lenses successively adopt the optical power of "positive, negative, positive, negative". Using a symmetric positive and negative optical power design, when light rays shoot from an object towards the lens, they are first refracted and converged by the front group of lenses, then restricted by the aperture stop, and then further refracted by the rear group of lenses to form an image on the image plane. This is beneficial to forming a large aperture structure, and at the same time, it can well correct various aberrations such as spherical aberration, coma, and astigmatism, making the image clear and sharp, and the imaging quality difference between the edge and the center small.

[0029] It should be noted that the effective focal length f of the optical system, the focal length f1 of the first lens E1, and the focal length f2 of the second lens E2 satisfy: -2.1 < f1 / f < -1.1, 0.8 < f2 / f < 1.9; the effective focal length f8 of the eighth lens satisfies -126 < f8 < -117. Meeting the above ranges can make the first lens E1 have an appropriate negative optical power and the second lens E2 have a certain positive optical power, enabling the light rays to be first diverged by the negative optical power first lens E1 and then converged by the subsequent positive optical power second lens E2. The combination of positive and negative optical power lenses is beneficial for the lens to achieve a large target surface effect; in a large aperture lens, the incident angle of the marginal light rays on the sensor may be too large, resulting in vignetting or a decrease in pixel response. The rear negative optical power lens can reduce the incident angle of the light rays and improve the marginal image quality.

[0030] As an improvement, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens satisfy 0.9 < f1 / f6 < 1; the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy 0.9 < f4 / f5 < 1. Meeting the above ranges, using a combination of lenses with similar focal lengths can distribute the total optical power of the system to multiple lenses, avoiding significant spherical aberration, coma, or astigmatism introduced by a single lens due to excessive optical power; when the focal lengths of the lenses are close, the refractive power of a single lens is relatively low, reducing the sensitivity to lens eccentricity, tilt, or spacing errors, and lowering the difficulty and cost of processing and assembly; at the same time, when the lenses with similar focal lengths are combined, the thermal expansion effects of each lens partially offset each other when the temperature changes, reducing the system focal length drift and optimizing thermal compensation.

[0031] As an improvement, the Abbe number of the fourth aspheric glass lens E4 is greater than 60 and less than 70; the fourth lens uses an aspheric and low-dispersion material. The aspheric lens itself can correct spherical aberration and astigmatism through surface curvature changes, while the low-dispersion material further suppresses chromatic aberration, making multi-wavelength light closer to the same focus, improving sharpness and color reproduction; the combination of the two can significantly reduce purple fringing and dispersion phenomena at the edge of the image. At the same time, the aspheric lens with a high Abbe number can maintain high resolution from the center to the edge at a large aperture, avoiding a decrease in imaging quality.

[0032] As an improvement, the exit pupil position EXPP and the entrance pupil position ENPP of the optical system satisfy: 2 < (EXPP - ENPP) / (EXPP + ENPP) < 2.5; by defining the exit pupil position and the entrance pupil position of the optical system, it is ensured that the light rays in all fields of view pass through all lenses, ensuring that the exit pupil and entrance pupil positions can match the sensor characteristics, reducing vignetting, and being beneficial to the large target surface design of the optical system.

[0033] As an improvement, the entrance pupil diameter EPD of the present optical system and the maximum holographic height IH of the optical imaging system satisfy: 3 < IH / EPD < 4; meeting the above ranges can ensure a larger beam width entering the optical system while ensuring that the optical system realizes a large target surface, being beneficial to the large aperture design of the optical system, still being able to clearly record the driving road conditions in a dark environment without street lights, significantly improving the night imaging quality, and enhancing driving safety.

[0034] As an improvement, in the above optical imaging system provided by the embodiments of the present invention, the maximum holographic height IH of the optical imaging system satisfies the following condition: IH ≥ 9.64 mm.

[0035] As an improvement, in the above optical imaging system provided by the embodiments of the present invention, the maximum field of view angle of the optical imaging system: FOV ≥ 148°.

[0036] As an improvement, in the above optical imaging system provided by the embodiments of the present invention, the aperture of the optical imaging system: F / NO = 1.4.

[0037] As an improvement, in the above optical imaging system provided by the embodiments of the present invention, the effective focal length f of the optical imaging system satisfies the following condition: 4.02 mm ≤ f ≤ 4.12 mm.

[0038] As an improvement, in the above optical imaging system provided by the embodiments of the present invention, the stop ST0 of the optical imaging system is disposed between the fourth lens E4 and the fifth lens E5.

[0039] In summary, the super-large target surface 4K starlight night vision DVR optical imaging system provided by the embodiments of the present invention is designed with a 1GM2G5P structure, which can be matched with a large target surface 1 / 1.8 chip. Compared with the traditional 1 / 2.7 chip, the target surface area is significantly increased, effectively solving the vignetting problem that occurs when the traditional DVR matches the large target surface chip, and improving the imaging uniformity and clarity; at the same time, it adopts a large aperture design of F1.4, and can still clearly record the driving road conditions in the dark environment without street lights, significantly improving the night imaging quality and enhancing the driving safety; through the thermal temperature drift compensation technology, this model realizes an athermal design, and the working temperature range is extended to -40°C to 95°C, meeting the application requirements in complex temperature environments, and improving the reliability and stability of the product; it adopts a low-dispersion glass molded aspheric design, optimizing the purple fringing phenomenon and improving the picture quality of the lens imaging, making the image clearer and the color more real; this design can achieve high-definition imaging of 8 million pixels, clearly record the driving road conditions, and provide a strong guarantee for driving safety.

[0040] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0041] Among them, the parameters of each lens in this embodiment are listed in Table 1 below, and the aspheric coefficients of the lenses are shown in Table 2 below.

[0042] Table 1 Physical parameters of each lens

[0043] Table 2 Aspheric coefficients of lenses

[0044]

[0045] The aspheric coefficients satisfy the following equation:

[0046] Among them, z is the aspherical sagittal height, c is the aspherical paraxial curvature, y is the lens aperture, k is the conic coefficient, a4 is the 4th-order aspherical coefficient, a6 is the 6th-order aspherical coefficient, a8 is the 8th-order aspherical coefficient, a10 is the 10th-order aspherical coefficient, a12 is the 12th-order aspherical coefficient, and a14 is the 14th-order aspherical coefficient.

[0047] Specifically, in this embodiment, the R values and thicknesses of each lens surface are shown in Table 1, and the aspherical parameters are shown in Table 2.

[0048] Specifically, in this embodiment, the R values (Radius curvature radius), thicknesses (Thickness), refractive indices (Index), Abbe numbers (ABB), and effective focal lengths of the lenses (EFL-E) of each lens surface are shown in Table 1, and the aspherical parameters are shown in Table 2. In Table 1, Surf represents the mirror surface number, InFInITY represents infinity, in Table 2, R1 represents the curvature radius of the corresponding lens surface facing the object side, and R2 represents the curvature radius of the corresponding lens surface facing the image side. A positive curvature radius indicates that the mirror surface bends towards the object surface side, and a negative curvature radius indicates that the mirror surface bends towards the image surface side.

[0049] Among them, the effective focal length of the optical imaging system provided in Table 1 is 4.08 mm, the total TTL optical length is 24.27 mm, the full image height is 9.64 mm, the maximum field of view angle is 148 degrees, and the aperture F / NO is 1.4. In Table 1, the mirror surface numbers 1 and 2 represent the two mirror surfaces of lens 1 along the light incident direction in sequence, the mirror surface numbers 3 and 4 represent the two mirror surfaces of lens 2 along the light incident direction in sequence, the mirror surface numbers 5 and 6 represent the two mirror surfaces of lens 3 along the light incident direction in sequence, the mirror surface numbers 7 and 8 represent the two mirror surfaces of lens 4 along the light incident direction in sequence, the mirror surface numbers 10 and 11 represent the two mirror surfaces of lens 5 along the light incident direction in sequence, the mirror surface numbers 12 and 13 represent the two mirror surfaces of lens 6 along the light incident direction in sequence, the mirror surface numbers 14 and 15 represent the two mirror surfaces of lens 7 along the light incident direction in sequence, and the mirror surface numbers 16 and 17 represent the two mirror surfaces of lens 8 along the light incident direction in sequence.

[0050] In the embodiment of the present invention, Figure 2It is a modulation transfer function (MTF) curve graph in the visible light band, representing the comprehensive resolution ability of an optical imaging system. The horizontal axis in the graph represents the spatial frequency, unit: cycles per millimeter (cycles / mm), and the vertical axis represents the value of the modulation transfer function (MTF). The value of MTF is used to evaluate the imaging quality of the lens, and its value range is 0 - 1. It should be noted 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 its curve is, the better the imaging quality of the system and the stronger the ability to restore real images. From Figure 2 it can be seen that in the imaging area near the center of the visible light band, MTF > 0.7, and the imaging quality is good. From Figure 3 the defocus curve graph, it can be seen that the MTF concentration of this lens is good, which is convenient for focusing. From Figure 4 And Figure 5 it can be seen that the defocus curves at high temperature and low temperature both meet high resolution, the change amount of the defocus curve focus is small, and good imaging effects can also be maintained in high and low temperature environments; Figure 6 It is represented as an F-THETA distortion graph. The smaller the F-THETA distortion is, the smaller the compression amount of the imaging picture edge; Figure 7 It is represented as a field curvature graph. From Figure 7 it can be known that the field curvature value is controlled between -0.05mm and 0.05mm. The smaller the field curvature value is, the better the imaging quality of the lens; Figure 8 It is the standard spot diagram of the visible light wavelength in the invention embodiment; Figure 9 It is represented as a lateral chromatic aberration graph. The smaller the lateral chromatic aberration is, the better the color restoration degree of the imaging picture and the better the purple edge optimization.

Claims

1. An ultra-large target surface 4K starlight night vision DVR optical imaging system, characterized in that: Along the optical axis from the object surface to the image surface in sequence are: The first lens which is a meniscus spherical glass with negative optical power; The second lens which is a concavo-convex aspherical plastic with positive optical power; The third lens which is a concavo-convex aspherical plastic with negative optical power; The fourth lens which is a biconvex aspherical glass with positive optical power; The aperture stop; The fifth lens which is a biconvex aspherical plastic with positive optical power; The sixth lens which is a biconcave aspherical plastic with negative optical power; The seventh lens which is a biconvex spherical glass with positive optical power; The eighth lens which is an M-shaped aspherical plastic with negative optical power; The filter; The image surface; Wherein, the ratio of the focal length of the first lens to the eighth lens to the focal length of the optical system satisfies the following set relationship: -2.1 < f1 / f < -1.1, 3.7 < f2 / f < 4.8, -5.6 < f3 / f < -4.7, 2.1 < f4 / f < 3.1, 2.1 < f5 / f < 3.1, -2.3 < f6 / f < -1.3, 2.2 < f7 / f < 3.2, -29.5 < f8 / f < -28.1; 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, f8 represents the effective focal length of the eighth lens, and f represents the effective focal length of the optical system; Wherein, the effective focal length f of the optical system, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -2.1 < f1 / f < -1.1, 0.8 < f2 / f < 1.9; the effective focal length f8 of the eighth lens satisfies -126 < f8 < -117.

2. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1, characterized in that: The following condition is satisfied between the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens: 0.9 < f1 / f6 < 1; The following condition is satisfied between the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens: 0.9 < f4 / f5 < 1.

3. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1 or 2, characterized in that: The Abbe number of the fourth lens is greater than 60 and less than 70.

4. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1 or 2, characterized in that: The exit pupil position EXPP and the entrance pupil position ENPP of the optical system satisfy the following condition: 2 < (EXPP - ENPP) / (EXPP + ENPP) < 2.

5.

5. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1 or 2, characterized in that: The entrance pupil diameter EPD of the optical system and the maximum full image height IH of the optical imaging system satisfy the following condition: 3 < IH / EPD < 4.

6. The ultra-large target surface 4K starlight night vision DVR optical imaging system according to claim 1 or 2, characterized in that: The maximum full image height IH of the optical imaging system satisfies the following condition: IH ≥ 9.64 mm.

7. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1 or 2, characterized in that: The maximum field of view angle of the optical imaging system satisfies the following condition: FOV ≥ 148°.

8. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1, characterized in that: The aperture of the optical imaging system satisfies the following condition: F / NO = 1.

4.

9. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1, characterized in that: The effective focal length f of the optical imaging system satisfies the following condition: 4.02 mm ≤ f ≤ 4.12 mm.

10. The super-large target surface 4K starlight night vision DVR optical imaging system according to claim 1, wherein: The object surface side of the first lens is convex, and the image surface side is concave; the object surface side of the second lens is concave, and the image surface side is convex; the object surface side of the third lens is concave, and the image surface side is convex; the object surface side of the fourth lens is a small convex surface, and the image surface side is a large convex surface; the object surface side of the fifth lens is a large convex surface, and the image surface side is a small convex surface; the object surface side of the sixth lens is a small concave surface, and the image surface side is a large concave surface; the object surface side of the seventh lens is a small convex surface, and the image surface side is a large convex surface; the eighth lens is an M-shaped lens, the object surface side is convex, and the image surface side is concave.

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