Vehicle-mounted binocular camera lens

Abstract

The application relates to a vehicle-mounted front-view binocular camera lens, which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from left to right along the light path of light incidence. The design of four glass spherical lenses and three glass aspherical lenses is adopted, the optical power is reasonably distributed, the optical system has high definition, more details can be shot, and the recognition accuracy is improved; the first, second and seventh lenses are glass aspherical lenses, which can reduce aberration, improve image quality, reduce the number of lenses and reduce the outer diameter size of the lens. The lens also has the advantages of a large light aperture and good environmental stability.

Description

Technical Field

[0001] This invention relates to a vehicle-mounted forward-looking binocular camera lens. Background Technology

[0002] Cameras are an essential component in the field of intelligent driving, playing a crucial role in acquiring image information. Monocular cameras capture images that are then used to identify objects through algorithms, with perception tasks including lane detection, traffic sign recognition, and obstacle detection. However, this image processing method has certain limitations, leading to the development of binocular vision systems. These systems mimic the human eye to construct stereoscopic images of objects for target detection and distance measurement, offering advantages such as higher efficiency and accuracy. With the rapid development and application of binocular vision systems in automobiles, the requirements for camera lens assemblies are constantly increasing. Currently available automotive front-view lenses struggle to simultaneously achieve high image quality, large aperture, and low temperature drift. 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 a vehicle-mounted forward-looking binocular camera lens. It meets the optical performance requirements of high definition, large aperture, and low temperature drift, while also having low tolerance sensitivity, making the lens easy to assemble and reducing lens production costs.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a vehicle-mounted forward-looking binocular camera lens, comprising a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from left to right along the incident light path; without considering the curvature caused by the aspherical coefficient, the first lens is a meniscus negative lens with a convex object side and a concave image side; the second lens is a meniscus negative lens with a concave object side and a convex image side; the third lens is a biconvex positive lens; the fourth lens is a biconvex positive lens; the fifth lens is a biconcave negative lens; the sixth lens is a biconvex positive lens; and the seventh lens is a meniscus positive lens with a convex object side and a concave image side; wherein the fifth and sixth lenses are a cemented lens group; all lenses are made of glass material, wherein the third, fourth, fifth, and sixth lenses are glass spherical lenses, and the first, second, and seventh lenses are glass aspherical lenses.

[0005] Preferably, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -3.0 <f1 / f<-2.0,-9.0<f2 / f<-7.5,1.0<f3 / f<2.5,1.0<f4 / f<2.5,-1.0<f5 / f<-0.5,0.5<f6 / f<1.5,1.5<f7 / f<3.0。

[0006] Preferably, the first lens satisfies the relationship: 1.7 ≤ N d ≤1.85, V d ≤50.0; The second lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The third lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The sixth lens satisfies the relationship: 1.8≤N d ≤1.9, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.65, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0007] Preferably, the first lens, the second lens, and the seventh lens are aspherical lenses, and the equation of the aspherical curve is expressed as follows:

[0008]

[0009] Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of h; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0010] 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 ≤ 5.0.

[0011] Preferably, the F-number of the optical system is ≤1.42.

[0012] Preferably, the image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≥1.0.

[0013] Compared with existing technologies, the present invention has the following beneficial effects: The vehicle-mounted forward-looking binocular camera lens provided by the present invention adopts a design of four glass spherical lenses and three glass aspherical lenses. By rationally allocating optical power, the optical system has high definition, can capture more details, and improve recognition accuracy. The first, second, and seventh lenses are glass aspherical lenses, which can reduce aberrations, improve image quality, reduce the number of lenses, and shrink the lens outer diameter. All lenses are made of glass, and have high relative illumination across the entire field of view, which can better adapt to various environmental brightness conditions. The present invention effectively considers current lens manufacturing processes, optimizes their tolerance sensitivity, improves assembly yield, and reduces production costs. It has low high and low temperature drift, and the glass lenses have a small coefficient of thermal expansion, enabling stable imaging in high and low temperature environments.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the optical structure of the present invention;

[0016] Figure 2 This is the axial chromatic aberration diagram of the entire working band of the present invention;

[0017] Figure 3 This is the transverse chromatic aberration diagram of the entire working band of the present invention;

[0018] Figure 4 This is the field curvature distortion diagram of the entire working band of the present invention;

[0019] Figure 5 This is the defocusing curve of the present invention at a low temperature of -40°C in the visible light band;

[0020] Figure 6 This is the defocusing curve of the present invention at room temperature (25°C) in the visible light band;

[0021] Figure 7 This is the defocusing curve of the present invention at a high temperature of 105°C in the visible light band;

[0022] In the diagram: L1 - first lens; L2 - second lens; L3 - third lens; STO - aperture stop; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - seventh lens; L8 - equivalent glass plate; IMA - imaging plane. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] 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.

[0025] 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.

[0026] like Figures 1-7 As shown, this embodiment provides a vehicle-mounted forward-facing binocular camera lens, including a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from left to right along the incident light path. Without considering the curvature caused by aspherical coefficients, the first lens is a meniscus negative lens with a convex object-side surface and a concave image-side surface; the second lens is a meniscus negative lens with a concave object-side surface and a convex image-side surface; the third lens is a biconvex positive lens; the fourth lens is a biconvex positive lens; the fifth lens is a biconcave negative lens; the sixth lens is a biconvex positive lens; and the seventh lens is a meniscus positive lens with a convex object-side surface and a concave image-side surface. The fifth and sixth lenses are a cemented lens group. All lenses are made of glass, with the third, fourth, fifth, and sixth lenses being spherical glass lenses, and the first, second, and seventh lenses being aspherical glass lenses.

[0027] In this embodiment of the invention, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -3.0 <f1 / f<-2.0,-9.0<f2 / f<-7.5,1.0<f3 / f<2.5,1.0<f4 / f<2.5,-1.0<f5 / f<-0.5,0.5<f6 / f<1.5,1.5<f7 / f<3.0。

[0028] In this embodiment of the invention, the first lens satisfies the relationship: 1.7 ≤ N d ≤1.85, V d ≤50.0; The second lens satisfies the relationship: 1.7≤N d ≤1.85, V d≤50.0; The third lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The sixth lens satisfies the relationship: 1.8≤N d ≤1.9, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.65, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0029] In this embodiment of the invention, the first lens, the second lens, and the seventh lens are aspherical lenses, and the equation of the aspherical curve is expressed as follows:

[0030]

[0031] Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of h; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[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 ≤ 5.0.

[0033] In this embodiment of the invention, the F-number of the optical system is ≤1.42.

[0034] In this embodiment of the invention, the image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≥1.0.

[0035] In this embodiment of the invention, the technical specifications achieved by the optical system are as follows:

[0036] Focal length: 6.5≤EFFL≤7.5mm; (2) Aperture F≤1.42; (3) Field of view: 2w≥100°; (4) Working band: Visible light band.

[0037] In this embodiment of the invention, to achieve the above design parameters, the specific design of the optical system adopted in this embodiment is shown in the table below:

[0038]

[0039]

[0040] The aspherical coefficients of the aspherical lenses in the optical system of this embodiment are shown in the table below:

[0041]

[0042] This embodiment of the optical system achieves a large aperture and minimal high and low temperature drift, while also effectively correcting on-axis and off-axis aberrations. The vehicle-mounted forward-looking binocular camera lens provided by this invention employs a design of four glass spherical lenses and three glass aspherical lenses. Through reasonable allocation of optical power, the optical system achieves high definition, capturing more details and improving recognition accuracy. The first, second, and seventh lenses are glass aspherical lenses, which reduce aberrations, improve image quality, reduce the number of lenses, and shrink the lens outer diameter. All lenses are made of glass, and the high relative illumination across the entire field of view allows for better adaptation to various environmental brightness conditions. The design effectively considers current lens manufacturing processes, optimizing tolerance sensitivity, improving assembly yield, and reducing production costs. It exhibits low high and low temperature drift, and the small coefficient of thermal expansion of the glass lenses enables stable imaging in both high and low temperature environments.

[0043] 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. A vehicle-mounted forward-looking binocular camera lens, characterized in that: The lens comprises a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from left to right along the incident light path. Without considering the curvature caused by aspherical coefficients, the first lens is a meniscus negative lens with a convex object-side surface and a concave image-side surface; the second lens is a meniscus negative lens with a concave object-side surface and a convex image-side surface; the third lens is a biconvex positive lens; the fourth lens is a biconvex positive lens; the fifth lens is a biconcave negative lens; the sixth lens is a biconvex positive lens; and the seventh lens is a meniscus positive lens with a convex object-side surface and a concave image-side surface. The fifth and sixth lenses are cemented lens groups; all lenses are made of glass, with the third, fourth, fifth, and sixth lenses being spherical glass lenses, and the first, second, and seventh lenses being aspherical glass lenses; the focal length of the optical system is f, and the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses are f1, f2, f3, f4, f5, f6, and f7, respectively, where f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -3.0 <f1 / f<-2.0,-9.0<f2 / f<-7.5,1.0<f3 / f<2.5,1.0<f4 / f<2.5, -1.0 <f5 / f<-0.5,0.5<f6 / f<1.5,1.5<f7 / f<3.0。 2. The vehicle-mounted forward-looking binocular camera lens according to claim 1, characterized in that: The first lens satisfies the relationship: 1.7 ≤ N d ≤1.85, V d ≤50.0; The second lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The third lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The fourth lens satisfies the following relationship: N d ≤1.5, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤1.85, V d ≤50.0; The sixth lens satisfies the relationship: 1.8≤N d ≤1.9, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.65, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

3. The vehicle-mounted forward-looking binocular camera lens according to claim 1, characterized in that: The first lens, the second lens, and the seventh lens are aspherical lenses, and the equation for the aspherical curve is: Where z is the distance from the vertex of the aspherical surface to the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, r = 1 / c; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

4. The vehicle-mounted forward-looking binocular camera lens according to claim 1, characterized in that: The total optical length (TTL) of an optical system and the focal length (f) of the optical system satisfy the following condition: TTL / f ≤ 5.

0.

5. The vehicle-mounted forward-looking binocular camera lens according to claim 1, characterized in that: The F-number of the optical system is ≤1.

42.

6. The vehicle-mounted forward-looking binocular camera lens according to claim 1, characterized in that: The image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≥1.0.

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