A smart traffic camera

Abstract

This invention provides an intelligent traffic lens, comprising, arranged sequentially from object side to image side, a first positive power lens with a first and second surface being convex and concave respectively, a second positive power lens with a first and second surface being convex and concave respectively, a first negative power lens with a first and second surface being concave respectively, an aperture stop, a second negative power lens with a first and second surface being concave and concave respectively, a third positive power lens with a first and second surface being convex and concave respectively, a fourth positive power lens with a first and second surface being convex and concave respectively, a fifth positive power lens with a first and second surface being convex and concave respectively, a third negative power lens with a first and second surface being concave and concave respectively, and a plane lens. The traffic lens of this invention consists of only 9 lenses, allowing for a more compact optical path design and a smaller overall lens size.

Description

Technical Field

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

[0002] Intelligent Transportation Systems (ITS) are a new type of traffic management system that achieves comprehensive monitoring and efficient management of urban traffic operations through the deep integration of advanced information technology, computer technology, and data transmission technology. This system plays an increasingly important role in modern urban traffic management, not only improving traffic efficiency but also significantly enhancing the travel experience for citizens.

[0003] In intelligent transportation systems, image acquisition technology is one of the fundamental supporting systems, and its core lies in the ability of front-end cameras and their accompanying lenses to acquire image data. Accuracy directly depends on the imaging performance of the lens, including image sharpness, dynamic range, and color reproduction capabilities. Therefore, the lens system needs to meet several key parameters: large target area, large aperture, high resolution, as well as technical requirements such as day and night confocality and high and low temperature stability.

[0004] However, in order to achieve a large aperture, the optical path design of current intelligent traffic lenses is generally too long, resulting in a large overall size of the lens, which makes it difficult to meet the requirements of miniaturization and limits the widespread application of traffic lenses.

[0005] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0006] This invention provides an intelligent traffic camera, which aims to solve the technical problem of insufficient high-resolution imaging capability in existing intelligent traffic cameras.

[0007] The technical solution of the present invention is as follows: A smart traffic camera includes a first positive power lens, a second positive power lens, a first negative power lens, an aperture stop, a second negative power lens, a third positive power lens, a fourth positive power lens, a fifth positive power lens, a third negative power lens, and a plane lens arranged sequentially from the object side to the image side. With the direction facing the object as the first surface and the direction facing the image as the second surface, the first and second surfaces of the first positive power lens are convex and concave, respectively; the first and second surfaces of the second positive power lens are convex and convex, respectively; the first and second surfaces of the first negative power lens are concave and concave, respectively; the first and second surfaces of the second negative power lens are concave and concave, respectively; the first and second surfaces of the third positive power lens are convex and convex, respectively; the first and second surfaces of the fourth positive power lens are convex and convex, respectively; the first and second surfaces of the fifth positive power lens are convex and convex, respectively; and the first and second surfaces of the third negative power lens are concave and concave, respectively.

[0008] In an optional embodiment of the present invention, the second positive power lens and the first negative power lens, the second negative power lens and the third positive power lens, and the fifth positive power lens and the third negative power lens are all cemented doublet lenses.

[0009] In an optional embodiment of the present invention, the radii of curvature of the first and second surfaces of the first positive power lens are 18.864~20.750 mm and 81.504~89.654 mm, respectively; the radii of curvature of the first and second surfaces of the second positive power lens are 14.717~16.188 mm and -233.952~-257.347 mm, respectively; the radii of curvature of the first and second surfaces of the first negative power lens are -233.952~-257.347 mm and 8.659~9.525 mm, respectively; the radii of curvature of the first and second surfaces of the second negative power lens are -9.216~-10.138 mm and 19.200~21.120 mm, respectively; and the radii of curvature of the first and second surfaces of the third positive power lens are 19.200~21.120 mm, respectively. The first and second surfaces of the fourth positive power lens have radii of curvature of -134.112 to -147.523 mm and -24.691 to -27.160 mm, respectively; the first and second surfaces of the fifth positive power lens have radii of curvature of 17.981 to -19.779 mm and -48.384 to -53.222 mm, respectively; the first and second surfaces of the third negative power lens have radii of curvature of -48.384 to -53.222 mm and 23.885 to 26.273 mm, respectively.

[0010] In an optional embodiment of the present invention, the center thickness of the first positive power lens is 3.379~3.717mm; the center thickness of the second positive power lens is 3.706~4.076mm; the center thickness of the first negative power lens is 2.256~2.482mm; the center thickness of the second negative power lens is 0.960~1.056mm; the center thickness of the third positive power lens is 4.704~5.174mm; the center thickness of the fourth positive power lens is 3.994~4.393mm; the center thickness of the fifth positive power lens is 3.648~4.013mm; the center thickness of the third negative power lens is 1.814~1.996mm; and the center thickness of the planar lens is 1.440~1.584mm.

[0011] In an optional embodiment of the present invention, the air gap between the first positive power lens and the second positive power lens is 0.096~0.106mm; the air gap between the first negative power lens and the aperture stop is 2.961~3.257mm; the air gap between the aperture stop and the second negative power lens is 7.017~7.718mm; the air gap between the third positive power lens and the fourth positive power lens is 0.096~0.105mm; the air gap between the fourth positive power lens and the fifth positive power lens is 0.104~0.114mm; and the air gap between the third negative power lens and the plane lens is 4.607~5.067mm.

[0012] In an alternative embodiment of the present invention, the semi-diameters of the first surface and the second surface of the first positive power lens are 8.780~9.658mm and 8.064~8.870mm respectively; the semi-diameters of the first surface and the second surface of the second positive power lens are 7.361~8.097mm and 6.532~7.185mm respectively; the semi-diameters of the first surface and the second surface of the first negative power lens are 6.532~7.185mm and 5.138~5.652mm respectively; the semi-diameters of the first surface and the second surface of the second negative power lens are 5.061~5.567mm and 5.858~6.444mm respectively; the semi-diameters of the first surface and the second surface of the third positive power lens are 5.858~6.444mm and 6.336~6.970mm respectively; the semi-diameters of the first surface and the second surface of the fourth positive power lens are 7.008~7.709mm and 7.296~8.026mm respectively; the semi-diameters of the first surface and the second surface of the fifth positive power lens are 7.281~8.009mm and 6.947~7.641mm respectively; the semi-diameters of the first surface and the second surface of the third negative power lens are 6.947~7.641mm and 6.378~7.015mm respectively; the semi-diameters of the first surface and the second surface of the planar lens are 6.030~6.633mm and 5.942~6.537mm respectively.

[0013] In an alternative embodiment of the present invention, the refractive index of the glass material of the first positive power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the first negative power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second negative power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third positive power lens satisfies 1.45<n<1.70; the refractive index of the glass material of the fourth positive power lens satisfies 1.85<n<2.10; the refractive index of the glass material of the fifth positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third negative power lens satisfies 1.70<n<1.90; the refractive index of the glass material of the planar lens satisfies 1.50<n<1.65.

[0014] In an alternative embodiment of the present invention, the Abbe number of the glass material of the first positive power lens satisfies 10 < Vd < 25; the Abbe number of the glass material of the second positive power lens satisfies 60 < Vd < 75; the Abbe number of the glass material of the first negative power lens satisfies 10 < Vd < 25; the Abbe number of the glass material of the second negative power lens satisfies 25 < Vd < 45; the Abbe number of the glass material of the third positive power lens satisfies 60 < Vd < 75; the Abbe number of the glass material of the fourth positive power lens satisfies 15 < Vd < 30; the Abbe number of the glass material of the fifth positive power lens satisfies 45 < Vd < 60; the Abbe number of the glass material of the third negative power lens satisfies 25 < Vd < 45; the Abbe number of the glass material of the plane lens satisfies 55 < Vd < 70.

[0015] In an alternative embodiment of the present invention, the full-field MTF satisfies 200 lp / mm > 0.2; the focal length is 24.14~26.56 mm; the F-number is 1.46; the total optical length is 47.78~52.55 mm; the FOV is 25.248°; the half image height is 5.28~5.808 mm.

[0016] Beneficial effects: the present invention provides an intelligent traffic lens, comprising, arranged sequentially from an object side to an image side: a first positive power lens with a first surface and a second surface being a convex surface and a concave surface respectively, a second positive power lens with a first surface and a second surface being a convex surface and a convex surface respectively, a first negative power lens with a first surface and a second surface being a concave surface and a concave surface respectively, a diaphragm, a second negative power lens with a first surface and a second surface being a concave surface and a concave surface respectively, a third positive power lens with a first surface and a second surface being a convex surface and a convex surface respectively, a fourth positive power lens with a first surface and a second surface being a convex surface and a convex surface respectively, a fifth positive power lens with a first surface and a second surface being a convex surface and a convex surface respectively, a third negative power lens with a first surface and a second surface being a concave surface and a concave surface respectively, and a plane lens. The traffic lens of the present invention consists of only 9 lenses, enabling a more compact optical path design and a more miniaturized overall lens. Description of Drawings

[0017] Figure 1 is a structural diagram of the optical system of the intelligent traffic lens of the present invention; Figure 2 is an MTF diagram of Embodiment 1; Figure 3 is a spot diagram of Embodiment 1; Figure 4 is a field curvature / distortion diagram of Embodiment 1; Figure 5 is an illuminance diagram of Embodiment 1; Figure 6 is an MTF diagram of Embodiment 2; Figure 7This is a dot plot of Example 2; Figure 8 The field curvature / distortion diagram for Example 2; Figure 9 The illuminance diagram is for Example 2; Figure 10 The MTF plot for Example 3; Figure 11 This is a dot plot of Example 3; Figure 12 The field curvature / distortion diagram for Example 3; Figure 13 This is the illuminance diagram for Example 3. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] It should be noted in advance that in the following description of the present invention, if there are any terms, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application 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, they should not be construed as limiting the present invention.

[0020] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the invention. Therefore, the phrase "in one embodiment" or "in some embodiments" appears in various places throughout the specification, and not all references are to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0022] See Figure 1The present invention provides an intelligent traffic lens, comprising a first positive power lens 10, a second positive power lens 20, a first negative power lens 30, an aperture 40, a second negative power lens 50, a third positive power lens 60, a fourth positive power lens 70, a fifth positive power lens 80, a third negative power lens 90, and a plane lens 100 arranged sequentially from the object side to the image side.

[0023] With the direction facing the object as the first surface and the direction facing the image as the second surface, the first and second surfaces of the first positive power lens are convex and concave, respectively; the first and second surfaces of the second positive power lens are convex and convex, respectively; the first and second surfaces of the first negative power lens are concave and concave, respectively; the first and second surfaces of the second negative power lens are concave and concave, respectively; the first and second surfaces of the third positive power lens are convex and convex, respectively; the first and second surfaces of the fourth positive power lens are convex and convex, respectively; the first and second surfaces of the fifth positive power lens are convex and convex, respectively; and the first and second surfaces of the third negative power lens are concave and concave, respectively. This invention features a unique intelligent traffic lens design composed of only nine lenses. The lens not only adapts to imaging needs under different environmental conditions but also provides high-resolution imaging across different spectral ranges. Furthermore, this structure solves the technical problem of limited applicability of some large-aperture lenses due to excessively long optical path lengths, and has significant practical value.

[0024] In an optional embodiment of the present invention, the second positive power lens and the first negative power lens, the second negative power lens and the third positive power lens, and the fifth positive power lens and the third negative power lens are all cemented doublet lenses. In this embodiment of the present invention, by forming a cemented lens between some lenses, the structure can be simplified while correcting chromatic aberration, spherical aberration, and other aberrations between lenses. Furthermore, in the present invention, the two lenses of the cemented lens can be made of different materials, such as ZF glass with high refractive index and high dispersion and ZPK glass with low refractive index and low dispersion, respectively. This innovative combination enables the lens to effectively correct aberrations in the 400-850 nanometer range.

[0025] In an optional embodiment of the present invention, the second positive power lens within the cemented assembly may further employ a negative refractive index temperature coefficient design. This innovative design effectively compensates for the overall positive refractive index temperature coefficient of the system, thereby achieving precise compensation for temperature changes. This compensation technology enables the lens to maintain its optimal resolution imaging position within a temperature range of -30℃ to +70℃, ensuring the stability and reliability of the lens in complex environments.

[0026] In an optional embodiment of the present invention, the radii of curvature of the first and second surfaces of the first positive power lens are 18.864~20.750 mm and 81.504~89.654 mm, respectively; the radii of curvature of the first and second surfaces of the second positive power lens are 14.717~16.188 mm and -233.952~-257.347 mm, respectively; the radii of curvature of the first and second surfaces of the first negative power lens are -233.952~-257.347 mm and 8.659~9.525 mm, respectively; the radii of curvature of the first and second surfaces of the second negative power lens are -9.216~-10.138 mm and 19.200~21.120 mm, respectively; and the radii of curvature of the first and second surfaces of the third positive power lens are 19.200~21.120 mm, respectively. The curvature radii of the first and second surfaces of the fourth positive power lens are -134.112 to -147.523 mm and -24.691 to -27.160 mm, respectively; the curvature radii of the first and second surfaces of the fifth positive power lens are 17.981 to 19.779 mm and -48.384 to -53.222 mm, respectively; and the curvature radii of the first and second surfaces of the third negative power lens are -48.384 to -53.222 mm and 23.885 to 26.273 mm, respectively. The curvature radius of the lens can be understood as the "palette" of lens design. This invention corrects various lens optical defects by carefully selecting and combining lenses with different curvatures, ultimately producing a clear, accurate, and realistic image.

[0027] In an optional embodiment of the present invention, the center thickness of the first positive power lens is 3.379~3.717mm; the center thickness of the second positive power lens is 3.706~4.076mm; the center thickness of the first negative power lens is 2.256~2.482mm; the center thickness of the second negative power lens is 0.960~1.056mm; the center thickness of the third positive power lens is 4.704~5.174mm; the center thickness of the fourth positive power lens is 3.994~4.393mm; the center thickness of the fifth positive power lens is 3.648~4.013mm; the center thickness of the third negative power lens is 1.814~1.996mm; and the center thickness of the planar lens is 1.440~1.584mm. In precision optical design, the thickness of a lens is a "degree of freedom" as important as the radius of curvature. This invention achieves a fine balance between aberrations, performance, size, and cost by precisely adjusting the center thickness of the lens, thus realizing a sharp and practical optical system.

[0028] In an optional embodiment of the present invention, the air gap between the first positive power lens and the second positive power lens is 0.096~0.106mm; the air gap between the first negative power lens and the aperture stop is 2.961~3.257mm; the air gap between the aperture stop and the second negative power lens is 7.017~7.718mm; the air gap between the third positive power lens and the fourth positive power lens is 0.096~0.105mm; the air gap between the fourth positive power lens and the fifth positive power lens is 0.104~0.114mm; and the air gap between the third negative power lens and the plane lens is 4.607~5.067mm. The present invention, through the rational design of air gaps between lenses, creates a controlled "optical path buffer" that coordinates with the corresponding light rays, thereby further improving the optical performance of the lens.

[0029] In an optional embodiment of the present invention, the half-diameters of the first and second surfaces of the first positive power lens are 8.780~9.658 mm and 8.064~8.870 mm, respectively; the half-diameters of the first and second surfaces of the second positive power lens are 7.361~8.097 mm and 6.532~7.185 mm, respectively; and the half-diameters of the first and second surfaces of the first negative power lens are 6.532~7.185 mm, respectively. The first and second surfaces of the second negative power lens have half-diameters of 5.061~5.567mm and 5.858~6.444mm, respectively; the first and second surfaces of the third positive power lens have half-diameters of 5.858~6.444mm and 6.336~6.970mm, respectively; the first and second surfaces of the fourth positive power lens have half-diameters of 7.008~7.709mm and 7.296~8.026mm, respectively; the first and second surfaces of the fifth positive power lens have half-diameters of 7.281~8.009mm and 6.947~7.641mm, respectively; and the first and second surfaces of the third negative power lens have half-diameters of 6.947~7.641mm and 6.378~7.015mm, respectively. mm; the half-diameters of the first and second surfaces of the planar lens are 6.030~6.633mm and 5.942~6.537mm, respectively. In the lens design, the half-diameter of each lens was precisely balanced, achieving the best balance between size, cost, and image quality while meeting the target aperture and image field coverage requirements and minimizing them as much as possible.

[0030] In an optional embodiment of the present invention, the refractive index of the glass material of the first positive power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the first negative power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second negative power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third positive power lens satisfies 1.45<n<1.70; the refractive index of the glass material of the fourth positive power lens satisfies 1.85<n<2.10; the refractive index of the glass material of the fifth positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third negative power lens satisfies 1.70<n<1.90; the refractive index of the glass material of the plane lens satisfies 1.50<n<1.65. In an optical lens, the refractive index describes the degree of direction change (refraction) of light when it enters the material from air. By controlling the refractive index of different lens materials, the present invention enables each lens to achieve required light refraction with gentler curvature, which facilitates the control of lens aberration.

[0031] In an optional embodiment of the present invention, the Abbe number of the glass material of the first positive power lens satisfies 10<Vd<25; the Abbe number of the glass material of the second positive power lens satisfies 60<Vd<75; the Abbe number of the glass material of the first negative power lens satisfies 10<Vd<25; the Abbe number of the glass material of the second negative power lens satisfies 25<Vd<45; the Abbe number of the glass material of the third positive power lens satisfies 60<Vd<75; the Abbe number of the glass material of the fourth positive power lens satisfies 15<Vd<30; the Abbe number of the glass material of the fifth positive power lens satisfies 45<Vd<60; the Abbe number of the glass material of the third negative power lens satisfies 25<Vd<45; the Abbe number of the glass material of the plane lens satisfies 55<Vd<70. In an optical lens, the Abbe number describes the separation ability of the material for light of different colors (wavelengths), that is, the degree of dispersion. The Abbe number and the refractive index influence each other, and a high refractive index is often accompanied by a low Abbe number. The present invention reasonably considers the relationship between the Abbe number and the refractive index, and coordinates the Abbe number and refractive index characteristics of the material, so as to achieve better overall color performance of the lens.

[0032] In the present invention, the optical parameters of the lens are strictly designed, including key parameters such as the radius of curvature, central thickness and air gap of lenses. Taking the first positive power lens as an example, its central thickness is designed within the range of 3.379 ~3.717 mm, which ensures the accuracy of the optical path and the stability of imaging quality. In addition, the air gap between the aperture stop of the lens and the second negative power lens is precisely controlled within 7.017 ~7.718 mm, which effectively reduces the light attenuation in the system, thereby improving the imaging efficiency. By optimizing these optical parameters, the present invention obtains an intelligent traffic lens with a larger target surface, shorter total length, larger aperture and lower distortion, realizes the high-precision imaging capability of the lens under visible light and infrared spectra, and lays a technical foundation for applications in different working environments.

[0033] In an alternative embodiment of the present invention, the full-field MTF satisfies 200 lp / mm > 0.2; the focal length is 24.14~26.56 mm; the F-number is 1.46; the total optical length is 47.78~52.55 mm; the FOV is 25.248°; the half image height is 5.28~5.808 mm. The present invention significantly improves the performance of the lens through innovative optical structure design and optical parameter optimization method, and solves a number of key problems in the prior art. This innovative technical solution can not only meet the application requirements of intelligent traffic lenses under the requirements of large target surface, large aperture, high resolution, etc., but also provide more excellent solutions for other fields such as security monitoring, industrial imaging and the like.

[0034] In order to better illustrate the technical solution of the present invention, the present invention provides the following several specific embodiments, wherein the second positive power lens and the first negative power lens, the second negative power lens and the third positive power lens, and the fifth positive power lens and the third negative power lens are all cemented doublets. The glass material of the first positive power lens satisfies: 1.80 < n < 2.00, 10 < Vd < 25; the glass material of the second positive power lens satisfies: 1.55 < n < 1.75, 60 < Vd < 75; the glass material of the first negative power lens satisfies: 1.80 < n < 2.00, 10 < Vd < 25; the glass material of the second negative power lens satisfies: 1.55 < n < 1.75, 25 < Vd < 45; the glass material of the third positive power lens satisfies: 1.45 < n < 1.70, 60 < Vd < 75; the glass material of the fourth positive power lens satisfies: 1.85 < n < 2.10, 15 < Vd < 30; the glass material of the fifth positive power lens satisfies: 1.55 < n < 1.75, 45 < Vd < 60; the glass material of the third negative power lens satisfies: 1.70 < n < 1.90, 25 < Vd < 45; the glass material of the plane lens satisfies: 1.50 < n < 1.65, 55 < Vd < 70. The specific parameters of each embodiment are as follows: Table 1. Optical structure parameters of Example 1

[0035] See Figures 2-5 The lens design of Embodiment 1 of the present invention satisfies the following parameters: focal length: 25.15mm; F-number: 1.46; total optical length: 49.78mm; FOV: 25.248°; half-image height: 5.5mm; distortion <|-2.4%|; MTF of 200lp / mm > 0.2 across the entire field of view; RMS radius of 3.16 across the entire field of view; relative illumination of 46.7% across the entire field of view.

[0036] Table 2. Optical structure parameters of Example 2

[0037] See Figures 6-9 The lens design of Embodiment 2 of the present invention satisfies the following parameters: focal length: 24.14mm; F-number: 1.46; total optical length: 47.78mm; FOV: 25.248°; half-image height: 5.28mm; distortion <|-2.4%|; MTF across the entire field of view satisfies 200lp / mm>0.2; RMS radius across the entire field of view <3.03; relative illumination across the entire field of view >46.7%.

[0038] Table 3. Optical structure parameters of Example 3

[0039] See Figures 10-13 The lens design of Embodiment 3 of the present invention satisfies the following parameters: focal length: 26.56mm; F-number: 1.46; total optical length: 52.55mm; FOV: 25.248°; half-image height: 5.808mm; distortion <|-2.4%|; MTF across the entire field of view satisfies 200lp / mm>0.2; RMS radius across the entire field of view <3.332; relative illumination across the entire field of view >46.7%.

[0040] In summary, the intelligent traffic lens of this invention achieves a large aperture, large target area, short overall length, and low distortion. It is applicable in environments ranging from -30℃ to 70℃ and provides clear imaging in the 0.435-0.850µm wavelength range. The full-field-of-view MTF meets 200lp / mm>0.2 and is characterized by the following parameters: focal length: 24.14~26.56mm; F-number: 1.46; total optical length: 47.78~52.55mm; FOV: 25.248°; half-image height: 5.28~5.808mm. By comprehensively optimizing the optical structure and optical parameters of the lens, this invention achieves the following key performance improvements: First, the lens exhibits excellent performance in terms of small infrared defocusing, adapting to defocusing range requirements from micrometers to millimeters. Second, the lens has high resolution in both visible and infrared spectra, enabling it to achieve high-definition imaging performance both day and night, meeting the day-night co-focusing requirements that are difficult to achieve with traditional lenses.

[0041] In summary, this invention provides an intelligent traffic lens, comprising, sequentially arranged from the object side to the image side, a first positive power lens with a first surface convex and a second surface concave, a second positive power lens with a first surface convex and a second surface concave, a first negative power lens with a first surface concave and a second surface concave, an aperture stop, a second negative power lens with a first surface concave and a second surface concave, a third positive power lens with a first surface convex and a second surface concave, a fourth positive power lens with a first surface convex and a second surface concave, a fifth positive power lens with a first surface convex and a second surface concave, a third negative power lens with a first surface concave and a second surface concave, and a plane lens. This traffic lens consists of only nine lenses, allowing for a more compact optical path design and a smaller overall lens size.

[0042] Although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An intelligent traffic camera, characterized in that, comprising a first positive power lens, a second positive power lens, a first negative power lens, a diaphragm, a second negative power lens, a third positive power lens, a fourth positive power lens, a fifth positive power lens, a third negative power lens and a plane lens arranged in sequence from an object side to an image side; with a direction facing the object side defined as a first surface and a direction facing the image side defined as a second surface, the first surface and the second surface of the first positive power lens are a convex surface and a concave surface respectively; the first surface and the second surface of the second positive power lens are a convex surface and a convex surface respectively; the first surface and the second surface of the first negative power lens are a concave surface and a concave surface respectively; the first surface and the second surface of the second negative power lens are a concave surface and a concave surface respectively; the first surface and the second surface of the third positive power lens are a convex surface and a convex surface respectively; the first surface and the second surface of the fourth positive power lens are a convex surface and a convex surface respectively; the first surface and the second surface of the fifth positive power lens are a convex surface and a convex surface respectively; the first surface and the second surface of the third negative power lens are a concave surface and a concave surface respectively; the refractive index of the glass material of the first positive power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the first negative power lens satisfies 1.80<n<2.00; the refractive index of the glass material of the second negative power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third positive power lens satisfies 1.45<n<1.70; the refractive index of the glass material of the fourth positive power lens satisfies 1.85<n<2.10; the refractive index of the glass material of the fifth positive power lens satisfies 1.55<n<1.75; the refractive index of the glass material of the third negative power lens satisfies 1.70<n<1.90; the refractive index of the glass material of the plane lens satisfies 1.50<n<1.65; the Abbe number of the glass material of the first positive power lens satisfies 10<Vd<25; the Abbe number of the glass material of the second positive power lens satisfies 60<Vd<75; the Abbe number of the glass material of the first negative power lens satisfies 10<Vd<25; the Abbe number of the glass material of the second negative power lens satisfies 25<Vd<45; the Abbe number of the glass material of the third positive power lens satisfies 60<Vd<75; the Abbe number of the glass material of the fourth positive power lens satisfies 15<Vd<30; the Abbe number of the glass material of the fifth positive power lens satisfies 45<Vd<60; the Abbe number of the glass material of the third negative power lens satisfies 25<Vd<45; the Abbe number of the glass material of the plane lens satisfies 55<Vd<70; the second positive power lens and the first negative power lens, the second negative power lens and the third positive power lens, as well as the fifth positive power lens and the third negative power lens are all cemented doublets; The two lenses of the cemented doublet are made of glass materials with different refractive indices and dispersions, including ZF glass and ZPK glass, so that the aberrations of the lens are corrected in the range of 400-850 nanometers; the second positive power lens is made of glass material with a negative refractive index temperature coefficient so that the lens maintains the optimal resolution imaging position unchanged in the temperature range of -30℃ to +70℃. The intelligent traffic lens has an optical length of 47.78~52.55mm, a focal length of 24.14~26.56mm, an F-number of 1.46, a field of view (FOV) of 25.248°, and a half-image height of 5.28~5.808mm; and at a spatial frequency of 200lp / mm, the full-field modulation transfer function (MTF) is greater than 0.

2.

2. The intelligent traffic camera according to claim 1, characterized in that, The radii of curvature of the first and second surfaces of the first positive power lens are 18.864~20.750 mm and 81.504~89.654 mm, respectively; the radii of curvature of the first and second surfaces of the second positive power lens are 14.717~16.188 mm and -233.952~-257.347 mm, respectively; the radii of curvature of the first and second surfaces of the first negative power lens are -233.952~-257.347 mm and 8.659~9.525 mm, respectively; the radii of curvature of the first and second surfaces of the second negative power lens are -9.216~-10.138 mm and 19.200~21.120 mm, respectively; and the radii of curvature of the first and second surfaces of the third positive power lens are 19.200~21.120 mm, respectively. The first and second surfaces of the fourth positive power lens have radii of curvature of -134.112 to -147.523 mm and -24.691 to -27.160 mm, respectively; the first and second surfaces of the fifth positive power lens have radii of curvature of 17.981 to -19.779 mm and -48.384 to -53.222 mm, respectively; the first and second surfaces of the third negative power lens have radii of curvature of -48.384 to -53.222 mm and 23.885 to 26.273 mm, respectively.

3. The intelligent traffic camera according to claim 1, characterized in that, The center thickness of the first positive power lens is 3.379~3.717mm; the center thickness of the second positive power lens is 3.706~4.076mm; the center thickness of the first negative power lens is 2.256~2.482mm; the center thickness of the second negative power lens is 0.960~1.056mm; the center thickness of the third positive power lens is 4.704~5.174mm; the center thickness of the fourth positive power lens is 3.994~4.393mm; the center thickness of the fifth positive power lens is 3.648~4.013mm; the center thickness of the third negative power lens is 1.814~1.996mm; and the center thickness of the plane lens is 1.440~1.584mm.

4. The intelligent traffic camera according to claim 1, characterized in that, The air gap between the first positive power lens and the second positive power lens is 0.096~0.106mm; the air gap between the first negative power lens and the aperture stop is 2.961~3.257mm; the air gap between the aperture stop and the second negative power lens is 7.017~7.718mm; the air gap between the third positive power lens and the fourth positive power lens is 0.096~0.105mm; the air gap between the fourth positive power lens and the fifth positive power lens is 0.104~0.114mm; and the air gap between the third negative power lens and the plane lens is 4.607~5.067mm.

5. The intelligent traffic camera according to claim 1, characterized in that, The semi-diameters of the first and second surfaces of the first positive power lens are 8.780~9.658 mm and 8.064~8.870 mm, respectively; the semi-diameters of the first and second surfaces of the second positive power lens are 7.361~8.097 mm and 6.532~7.185 mm, respectively; and the semi-diameters of the first and second surfaces of the first negative power lens are 6.532~7.185 mm. The first and second surfaces of the second negative power lens have half-diameters of 5.061~5.567mm and 5.858~6.444mm, respectively; the first and second surfaces of the third positive power lens have half-diameters of 5.858~6.444mm and 6.336~6.970mm, respectively; the first and second surfaces of the fourth positive power lens have half-diameters of 7.008~7.709mm and 7.296~8.026mm, respectively; the first and second surfaces of the fifth positive power lens have half-diameters of 7.281~8.009mm and 6.947~7.641mm, respectively; and the first and second surfaces of the third negative power lens have half-diameters of 6.947~7.641mm and 6.378~7.015mm, respectively. mm; the half-diameters of the first and second surfaces of the planar lens are 6.030~6.633mm and 5.942~6.537mm, respectively.

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