ITS intelligent traffic lens

Abstract

The present application relates to a kind of ITS intelligent traffic lens, the front lens group A is sequentially arranged from left to right by positive lens A-1, meniscus negative lens A-2, meniscus positive lens A-3, meniscus negative lens A-4 along the light path of light incidence, wherein meniscus negative lens A-2 and meniscus positive lens A-3 constitute double cemented lens;The rear lens group B is sequentially arranged from left to right by double concave negative lens B-1, double convex positive lens B-2, double convex positive lens B-3, double convex positive lens B-4, double convex positive lens B-5, double concave negative lens B-6, double convex positive lens B-7, negative lens B-8 along the light path of light incidence, wherein double concave negative lens B-1 and double convex positive lens B-2, double convex positive lens B-5 and double concave negative lens B-6, double convex positive lens B-7 and negative lens B-8 respectively constitute double cemented lens;12 pieces of glass spherical lens are used, and the parameters such as the shape, thickness and air gap of each lens are optimized, to meet the optical performance such as large target surface, large optical aperture and high resolution, while meeting the requirements of day and night confocal, high and low temperature stability.

Description

Technical Field

[0001] This invention relates to an ITS (Intelligent Traffic System) camera. Background Technology

[0002] Intelligent Transportation Systems (ITS) are a new type of traffic management system. This system primarily combines information technology, computer technology, and data transmission technology to manage the entire transportation system, enabling comprehensive monitoring and management of people, vehicles, and roads. Image acquisition is a crucial step, and the performance of the camera lens determines the accuracy of image recognition and processing. Therefore, lenses need to have advantages such as a large target area, large aperture, and high resolution. Furthermore, for long-term outdoor operation, they must possess characteristics such as day and night focusing and high and low temperature stability to ensure the system can maintain normal operation under conditions of low light, low temperature, and high temperature. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an ITS intelligent traffic camera.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: an ITS intelligent traffic lens, wherein the lens comprises a front lens group A with negative optical power, an aperture stop, and a rear lens group B with positive optical power, arranged sequentially from left to right along the incident light path; the front lens group A comprises a positive lens A-1, a meniscus negative lens A-2, a meniscus positive lens A-3, and a meniscus negative lens A-4, arranged sequentially from left to right along the incident light path, wherein the meniscus negative lens A-2 and the meniscus positive lens A-3 constitute a cemented doublet lens. The rear lens group B consists of a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a biconvex positive lens B-5, a biconcave negative lens B-6, a biconvex positive lens B-7, and a negative lens B-8 arranged sequentially from left to right along the incident light path. Among them, the biconcave negative lens B-1 and the biconvex positive lens B-2, the biconvex positive lens B-5 and the biconcave negative lens B-6, the biconvex positive lens B-7 and the negative lens B-8 respectively constitute cemented doublet lenses; all lenses are glass spherical lenses.

[0005] Preferably, the positive lens A-1 is a plano-convex positive lens A-1, and the negative lens B-8 is a biconcave negative lens B-8.

[0006] Preferably, the positive lens A-1 is a meniscus positive lens A-1, and the negative lens B-8 is a plano-concave negative lens B-8.

[0007] Preferably, the focal length of the optical system is set to f, and the focal lengths of the positive lens A-1, the meniscus negative lens A-2, the meniscus positive lens A-3, the meniscus negative lens A-4, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3, the biconvex positive lens B-4, the biconvex positive lens B-5, the biconcave negative lens B-6, the biconvex positive lens B-7, and the negative lens B-8 are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f1, respectively. 10 f 11 f 12 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 It satisfies the following ratio with f: 1.5 <f1 / f<2.5,-2.5<f2 / f<-1.5,0.5<f3 / f<1.5,-1.5<f4 / f<-0.5,-1.0<f5 / f<0,0.5<f6 / f<1.5,0.5<f7 / f<1.5,1.0<f8 / f<2.0,0.5<f9 / f<1.5,-1.0<f 10 / f<0,0 <f 11 / f<1.0, -1.0 <f 12 / f<0.

[0008] Preferably, the positive lens A-1 satisfies the relationship: 1.8 ≤ N d ≤2.0, V d ≤50.0; the meniscus negative lens A-2 satisfies the following relationship: N d ≤1.5, V d ≥50.0; The meniscus lens A-3 satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The meniscus negative lens A-4 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconcave negative lens B-1 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconvex positive lens B-2 satisfies the following relationship: N d ≥1.5, V d ≥50.0; the biconvex positive lens B-3 satisfies the following relationship: N d ≥2.0, V d ≤50.0; the biconvex positive lens B-4 satisfies the following relationship: N d ≥1.5, V d ≥50.0; Biconvex positive lens B-5 satisfies the following relationship: N d ≥1.5, V d≥50.0; the biconcave negative lens B-6 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; Biconvex positive lens B-7 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; Negative lens B-8 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0009] Preferably, the total optical length (TTL) of the optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 2.5.

[0010] Preferably, the F-number of the optical system is ≤1.0.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention provides an ITS intelligent traffic lens, which uses twelve glass spherical lenses, reasonably matches the lens shape and optical power, and adjusts the appropriate air gap, so that the lens meets the advantages of large target surface, large light transmission diameter, and high resolution.

[0013] 2. The infrared defocusing amount has been optimized, which allows for clear imaging without changing any mechanical structure when switching between visible light mode and infrared light mode.

[0014] 3. While meeting all optical performance indicators, an all-glass design is adopted, and the materials of each lens and base are adjusted according to the relationship between the refractive index of the material and temperature, as well as the back focus compensation effect, to ensure that it can still achieve ultra-high-definition imaging under harsh outdoor working temperatures.

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the optical structure of Embodiment 1 of the present invention;

[0017] Figure 2 This is the axial chromatic aberration diagram of the entire working band of Embodiment 1 of the present invention;

[0018] Figure 3 This is the transverse chromatic aberration diagram of the entire working band of Embodiment 1 of the present invention;

[0019] Figure 4 This is the field curvature distortion diagram of the entire working band of Embodiment 1 of the present invention;

[0020] Figure 5This is a schematic diagram of the optical structure of Embodiment 2 of the present invention;

[0021] Figure 6 This is the axial chromatic aberration diagram of the entire working band of Embodiment 2 of the present invention;

[0022] Figure 7 This is the transverse chromatic aberration diagram of the entire working band of Embodiment 2 of the present invention;

[0023] Figure 8 This is the field curvature distortion diagram of the entire working band of Embodiment 2 of the present invention;

[0024] In the diagram: L1 - Positive lens A-1; L2 - Meniscus negative lens A-2; L3 - Positive meniscus lens A-3; L4 - Meniscus negative lens A-4; STO - Aperture stop; L5 - Biconcave negative lens B-1; L6 - Biconvex positive lens B-2; L7 - Biconvex positive lens B-3; L8 - Biconvex positive lens B-4; L9 - Biconvex positive lens B-5; L10 - Biconcave negative lens B-6; L11 - Biconvex positive lens B-7; L12 - Negative lens B-8; L13 - Equivalent glass plate; IMA - Imaging plane. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] like Figures 1-8As shown, this embodiment provides an ITS intelligent traffic lens, which consists of a front lens group A with negative optical power, an aperture stop, and a rear lens group B with positive optical power, arranged sequentially from left to right along the incident light path. The front lens group A consists of a positive lens A-1, a meniscus negative lens A-2, a meniscus positive lens A-3, and a meniscus negative lens A-4, arranged sequentially from left to right along the incident light path, wherein the meniscus negative lens A-2 and the meniscus positive lens A-3 constitute a cemented doublet lens; the rear lens... Group B consists of a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a biconvex positive lens B-5, a biconcave negative lens B-6, a biconvex positive lens B-7, and a negative lens B-8 arranged sequentially from left to right along the incident light path. Among them, the biconcave negative lens B-1 and the biconvex positive lenses B-2, B-5 ​​and B-6, B-7 and B-8 respectively constitute cemented doublet lenses; all lenses are glass spherical lenses.

[0029] It employs 12 glass spherical lenses, optimizing parameters such as the shape, thickness, and air gap of each lens to meet optical performance requirements such as large target surface, large light-transmitting aperture, and high resolution, while also satisfying the needs for day and night confocal focus and high and low temperature stability.

[0030] In this embodiment of the invention, the focal length of the optical system is set to f, and the focal lengths of the positive lens A-1, the meniscus negative lens A-2, the meniscus positive lens A-3, the meniscus negative lens A-4, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3, the biconvex positive lens B-4, the biconvex positive lens B-5, the biconcave negative lens B-6, the biconvex positive lens B-7, and the negative lens B-8 are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f1, respectively. 10 f 11 f 12 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 It satisfies the following ratio with f: 1.5 <f1 / f<2.5,-2.5<f2 / f<-1.5,0.5<f3 / f<1.5,-1.5<f4 / f<-0.5,-1.0<f5 / f<0,0.5<f6 / f<1.5,0.5<f7 / f<1.5,1.0<f8 / f<2.0,0.5<f9 / f<1.5,-1.0<f 10 / f<0,0 <f 11 / f<1.0, -1.0 <f 12 / f<0.

[0031] In this embodiment of the invention, the positive lens A-1 satisfies the relationship: 1.8 ≤ N d≤2.0, V d ≤50.0; the meniscus negative lens A-2 satisfies the following relationship: N d ≤1.5, V d ≥50.0; The meniscus lens A-3 satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The meniscus negative lens A-4 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconcave negative lens B-1 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconvex positive lens B-2 satisfies the following relationship: N d ≥1.5, V d ≥50.0; the biconvex positive lens B-3 satisfies the following relationship: N d ≥2.0, V d ≤50.0; the biconvex positive lens B-4 satisfies the following relationship: N d ≥1.5, V d ≥50.0; Biconvex positive lens B-5 satisfies the following relationship: N d ≥1.5, V d ≥50.0; the biconcave negative lens B-6 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; Biconvex positive lens B-7 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; Negative lens B-8 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0032] In this embodiment of the invention, the total optical length (TTL) of the optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 2.5.

[0033] In this embodiment of the invention, the F-number of the optical system is ≤1.0.

[0034] Specific implementation process:

[0035] In Embodiment 1 of the present invention, the positive lens A-1 is a plano-convex positive lens A-1, and the negative lens B-8 is a biconcave negative lens B-8.

[0036] like Figure 1-4As shown, an ITS intelligent traffic lens employs twelve glass spherical lenses, with a reasonable combination of lens shapes and optical power, and adjusted air gaps, enabling the lens to achieve advantages such as a large target surface, large aperture, and high resolution. It also meets the requirements of day and night confocal focus and high and low temperature stability.

[0037] The technical specifications achieved by the optical system in this embodiment are as follows:

[0038] (1) Focal length: EFFL = 40.0mm; (2) Aperture F ≤ 1.0; (3) Field of view: 2w ≥ 20°; (4) Working band: visible light band and 940nm band.

[0039] To achieve the above design parameters, the specific design of the optical system adopted in this embodiment is shown in the table below:

[0040]

[0041]

[0042] The optical system in this embodiment achieves a large target surface, large aperture, and high resolution, while also meeting the requirements of day and night confocality and high and low temperature stability.

[0043] In the second embodiment of the present invention, the positive lens A-1 is a meniscus positive lens A-1, and the negative lens B-8 is a plano-concave negative lens B-8.

[0044] like Figure 5-8 As shown, an ITS intelligent traffic lens employs twelve glass spherical lenses, with a reasonable combination of lens shapes and optical power, and adjusted air gaps, enabling the lens to achieve advantages such as a large target surface, large aperture, and high resolution. It also meets the requirements of day and night confocal focus and high and low temperature stability.

[0045] The technical specifications achieved by the optical system in this embodiment are as follows:

[0046] (2) Focal length: EFFL = 40.0mm; (2) Aperture F ≤ 1.0; (3) Field of view: 2w ≥ 20°; (4) Working band: visible light band and 940nm band.

[0047] To achieve the above design parameters, the specific design of the optical system adopted in this embodiment is shown in the table below:

[0048]

[0049]

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An ITS intelligent traffic camera, characterized in that: The lens comprises a front lens group A with negative optical power, an aperture stop, and a rear lens group B with positive optical power, arranged sequentially from left to right along the incident light path. The front lens group A consists of a positive lens A-1, a meniscus negative lens A-2, a meniscus positive lens A-3, and a meniscus negative lens A-4, arranged sequentially from left to right along the incident light path, wherein meniscus negative lens A-2 and meniscus positive lens A-3 form a cemented doublet. The rear lens group B consists of a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a biconvex positive lens B-5, a biconcave negative lens B-6, a biconvex positive lens B-7, and a negative lens B-8, arranged sequentially from left to right along the incident light path. The optical system is composed of a biconcave negative lens B-1 and biconvex positive lenses B-2, B-5 ​​and B-6, and B-7 and B-8, which respectively constitute a cemented doublet. All lenses are glass spherical lenses. The focal length of the optical system is set to f, and the focal lengths of the positive lens A-1, meniscus negative lens A-2, meniscus positive lens A-3, meniscus negative lens A-4, biconcave negative lens B-1, biconvex positive lens B-2, biconvex positive lens B-3, biconvex positive lens B-4, biconvex positive lens B-5, biconcave negative lens B-6, biconvex positive lens B-7, and negative lens B-8 are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f1, respectively. 10 f 11 f 12 Among them, f1, f2, f3, f4, f5, f6, f7, f8, f9, f 10 f 11 f 12 It satisfies the following ratio with f: 1.5 <f1 / f<2.5,-2.5<f2 / f<-1.5,0.5<f3 / f<1.5,-1.5<f4 / f<-0.5,-1.0<f5 / f<0,0.5<f6 / f<1.5,0.5<f7 / f<1.5,1.0<f8 / f<2.0,0.5<f9 / f<1.5,-1.0<f 10 / f<0,0 <f 11 / f<1.0, -1.0 <f 12 / f<0; The total optical length (TTL) of the optical system of the lens and the focal length (f) of the optical system satisfy: TTL / f≤2.

5.

2. The ITS intelligent traffic camera according to claim 1, characterized in that: The positive lens A-1 is a plano-convex positive lens A-1, and the negative lens B-8 is a biconcave negative lens B-8.

3. The ITS intelligent traffic camera according to claim 1, characterized in that: The positive lens A-1 is a meniscus positive lens A-1, and the negative lens B-8 is a plano-concave negative lens B-8.

4. The ITS intelligent traffic camera according to claim 1, characterized in that: Positive lens A-1 satisfies the relationship: 1.8 ≤ N d ≤2.0, V d ≤50.0; the meniscus negative lens A-2 satisfies the following relationship: N d ≤1.5, V d ≥50.0; The meniscus lens A-3 satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The meniscus negative lens A-4 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconcave negative lens B-1 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the biconvex positive lens B-2 satisfies the following relationship: N d ≥1.5, V d ≥50.0; the biconvex positive lens B-3 satisfies the following relationship: N d ≥2.0, V d ≤50.0; the biconvex positive lens B-4 satisfies the following relationship: N d ≥1.5, V d ≥50.0; Biconvex positive lens B-5 satisfies the following relationship: N d ≥1.5, V d ≥50.0; the biconcave negative lens B-6 satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; Biconvex positive lens B-7 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; Negative lens B-8 satisfies the relationship: 1.8≤N d ≤2.0, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

5. The ITS intelligent traffic camera according to claim 1, characterized in that: The optical system of the lens has an F-number ≤ 1.0.

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