A front-view ultra-wide-angle binocular camera

Abstract

The utility model relates to a kind of front-view ultra-wide-angle binocular camera, the optical system of camera is by first lens, second lens, third lens, diaphragm, fourth lens, fifth lens and sixth lens are sequentially arranged from left to right along light incident light path composition;In the case where not considering the reverse bending caused by aspherical coefficient, first lens is meniscus concave negative lens;Second lens is meniscus concave negative lens;Third lens is double-convex positive lens;Fourth lens is double-convex positive lens;Fifth lens is meniscus concave negative lens;Sixth lens is meniscus convex positive lens;All lenses are made of glass material, wherein sixth lens is glass aspherical lens, and fourth and fifth lenses constitute cemented lens group.The lens has the advantages of imaging angle greater than 120 degrees for object, high imaging clarity, large aperture, low tolerance sensitivity and good high-low temperature stability, and can more comprehensively monitor the scene in front of the vehicle.

Description

Technical Field

[0001] This utility model relates to a forward-looking ultra-wide-angle binocular camera, and relates to the field of lens technology. Background Technology

[0002] Automotive safety technologies include lane departure warning, active collision avoidance, adaptive cruise control, and traction control. The forward-looking camera system is a type of automotive safety technology with lane departure warning functionality, and the forward-looking camera module plays a crucial role as the hardware terminal of this system. Forward-looking camera modules are generally divided into two types: monocular and binocular. Monocular camera modules are less expensive and perform well when used with radar systems. However, binocular cameras can perform 3D stereo recognition, offering significant advantages in target tracking and position prediction. When combined with millimeter-wave radar, they can also detect target speed. Currently, the main problems with binocular camera modules include a smaller field of view, higher cost, system complexity, and difficulty in miniaturization. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a forward-looking ultra-wide-angle binocular camera that can achieve clear imaging at a wide angle of 120° while having a small size and high environmental stability.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a forward-looking ultra-wide-angle binocular camera, wherein the optical system of the camera consists of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth 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 with a convex object side and a convex image side; the fourth lens is a biconvex positive lens with a convex object side and a convex image side; the fifth lens is a meniscus negative lens with a concave object side and a convex image side; and the sixth lens is a meniscus convex positive lens with a concave object side and a convex image side; all lenses are made of glass, wherein the sixth lens is a glass aspherical lens, and the fourth and fifth lenses constitute a cemented lens group.

[0005] Preferably, the focal length of the optical system is set to f, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are f1, f2, f3, f4, f5, and f6, respectively, wherein f1, f2, f3, f4, f5, and f6 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,-6<f2 / f<-5.0,2.0<f3 / f<3.0,1.0<f4 / f<2.0,-2.0<f5 / f<-1.0,8.0<f6 / f<9.0。

[0006] Preferably, the first lens satisfies the relationship: 1.6 ≤ N d ≤1.9, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≥50.0; The third lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; The sixth lens satisfies the relation: 1.6≤N d ≤1.9, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0007] Preferably, the on-axis distances between the lenses satisfy the following relationships: the air gap between the first lens and the second lens is 2.5 to 3.0 mm; the air gap between the second lens and the third lens is 0.1 to 0.5 mm; the air gap between the third lens and the aperture stop is 0.1 to 0.5 mm; the air gap between the aperture stop and the fourth lens is 1.0 to 1.5 mm; the fourth lens and the fifth lens are a cemented lens group with an air gap of 0 mm; and the air gap between the fifth lens and the sixth lens is 0.1 to 0.5 mm.

[0008] Preferably, the equation for the aspherical curve of the sixth lens is as follows:

[0009]

[0010] Where z is the distance from the vertex of the aspherical surface to the optical axis at a position of height r; 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.

[0011] 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 ≤ 6.5.

[0012] Preferably, the F-number of the optical system is ≤1.9.

[0013] 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.

[0014] Preferably, a filter is provided on the rear side of the sixth lens.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This lens has an imaging angle of more than 120 degrees and features high imaging clarity, large light aperture, low tolerance sensitivity and good high and low temperature stability, while also enabling more comprehensive monitoring of the scene in front of the vehicle.

[0017] 2. By rationally matching the various optical lenses, the system structure is compact and reasonable, reducing the overall size, making it easy to assemble, with low tolerance sensitivity, and more suitable for large-scale high-yield production;

[0018] 3. It adopts an all-glass lens structure, which can better compensate for focal plane displacement at high and low temperatures and has high adaptability to complex environments;

[0019] 4. Corrected chromatic aberration along each axis, transverse chromatic aberration, and higher-order chromatic aberrations to ensure high imaging quality even at large angles;

[0020] 5. By fully utilizing the characteristics of aspherical surfaces and improving performance, the same principle applies to the miniaturization of lenses.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the optical structure of this utility model;

[0023] Figure 2 This is the axial chromatic aberration diagram of the entire working band of this utility model;

[0024] Figure 3 This is the transverse chromatic aberration diagram of the entire working band of this utility model;

[0025] Figure 4 This is the field curvature distortion diagram of the entire working band of this utility model;

[0026] In the diagram: STO - aperture stop; L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - first equivalent glass plate; L8 - second equivalent glass plate; IMA - imaging plane. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] 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.

[0029] 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.

[0030] like Figures 1-4 As shown, this embodiment provides a forward-looking ultra-wide-angle binocular camera. The optical system of the camera consists of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth 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 with a convex object-side surface and a convex image-side surface; the fourth lens is a biconvex positive lens with a convex object-side surface and a convex image-side surface; the fifth lens is a meniscus negative lens with a concave object-side surface and a convex image-side surface; and the sixth lens is a meniscus positive lens with a concave object-side surface and a convex image-side surface. All lenses are made of glass, with the sixth lens being a glass aspherical lens, and the fourth and fifth lenses forming a cemented lens group.

[0031] The first and second lenses are glass spherical lenses with negative optical power, facilitating the processing of large-angle light by subsequent optical systems. The fourth and fifth lenses form an achromatic cemented doublet. This reasonable lens combination enables the optical system to achieve a compact size, ultra-wide angle, large aperture, day and night confocal focus, and low temperature drift design. Simultaneously, it provides good correction for on-axis and off-axis aberrations, resulting in good image quality. Figures 2 to 4 As shown.

[0032] In this embodiment of the invention, the focal length of the optical system is set to f, and the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are f1, f2, f3, f4, f5, and f6, respectively, wherein f1, f2, f3, f4, f5, and f6 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,-6<f2 / f<-5.0,2.0<f3 / f<3.0,1.0<f4 / f<2.0,-2.0<f5 / f<-1.0,8.0<f6 / f<9.0。

[0033] In this embodiment of the invention, the first lens satisfies the relationship: 1.6 ≤ N d ≤1.9, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≥50.0; The third lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; The sixth lens satisfies the relation: 1.6≤N d ≤1.9, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0034] In this embodiment of the invention, the on-axis distances between the lenses satisfy the following relationships: the air gap between the first lens and the second lens is 2.5–3.0 mm; the air gap between the second lens and the third lens is 0.1–0.5 mm; the air gap between the third lens and the aperture stop is 0.1–0.5 mm; the air gap between the aperture stop and the fourth lens is 1.0–1.5 mm; the fourth lens and the fifth lens are a cemented lens group with an air gap of 0 mm; and the air gap between the fifth lens and the sixth lens is 0.1–0.5 mm.

[0035] In this embodiment of the invention, the equation for the aspherical curve of the sixth lens is expressed as follows:

[0036]

[0037] Where z is the distance from the vertex of the aspherical surface to the optical axis at a position of height r; 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.

[0038] 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 ≤ 6.5.

[0039] In this embodiment of the invention, the F-number of the optical system is ≤1.9.

[0040] 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.

[0041] In this embodiment of the invention, a filter is provided on the rear side of the sixth lens.

[0042] An imaging method for a forward-looking ultra-wide-angle binocular camera comprises the following steps: light sequentially passes through a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens before forming an image.

[0043] In this embodiment of the invention, the technical specifications achieved by the optical system are as follows:

[0044] (1) Focal length: 3.0≤EFFL≤4.0mm;

[0045] (2) Aperture F≤1.9;

[0046] (3) Field of view: 2w ≥ 120°;

[0047] (4) Operating band: Visible light band.

[0048] To achieve the above design parameters, the specific design of the optical system adopted in this embodiment is shown in the table below:

[0049]

[0050]

[0051] The aspherical coefficients of the aspherical lenses in the optical system of this embodiment are shown in the table below:

[0052]

[0053] The optical system in this embodiment achieves miniaturization of the lens group by rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis distance between each lens, while meeting the requirements of ultra-wide-angle imaging performance.

[0054] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model 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 this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A forward-looking ultra-wide-angle binocular camera, characterized in that: The optical system of the camera consists of a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth 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 with a convex object-side surface and a convex image-side surface; the fourth lens is a biconvex positive lens with a convex object-side surface and a convex image-side surface; the fifth lens is a meniscus negative lens with a concave object-side surface and a convex image-side surface; and the sixth lens is a meniscus positive lens with a concave object-side surface and a convex image-side surface. All lenses are made of glass, with the sixth lens being a glass aspherical lens, and the fourth and fifth lenses forming a cemented lens group.

2. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: Let the focal length of the optical system be f. The focal lengths of the first, second, third, fourth, fifth, and sixth lenses are f1, f2, f3, f4, f5, and f6, respectively. The ratios of f1, f2, f3, f4, f5, and f6 to f satisfy the following condition: -2.0 <f1 / f<-1.0,-6<f2 / f<-5.0,2.0<f3 / f<3.0,1.0<f4 / f<2.0,-2.0<f5 / f<-1.0,8.0<f6 / f<9.0。 3. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: The first lens satisfies the relationship: 1.6 ≤ N d ≤1.9, V d ≤50.0; The second lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≥50.0; The third lens satisfies the relationship: 1.6≤N d ≤1.9, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; The sixth lens satisfies the relation: 1.6≤N d ≤1.9, V d ≤50.0; where N d V is the refractive index. d Let be Abbe's constant.

4. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: The on-axis distances between the lenses satisfy the following relationships: the air gap between the first and second lenses is 2.5–3.0 mm; the air gap between the second and third lenses is 0.1–0.5 mm; the air gap between the third lens and the aperture stop is 0.1–0.5 mm; the air gap between the aperture stop and the fourth lens is 1.0–1.5 mm; the fourth and fifth lenses are a cemented lens group with an air gap of 0 mm; and the air gap between the fifth and sixth lenses is 0.1–0.5 mm.

5. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: The equation for the aspherical curve of the sixth lens is: Where z is the distance from the vertex of the aspherical surface to the optical axis at a position of height r; 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.

6. The forward-looking ultra-wide-angle binocular camera 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 ≤ 6.

5.

7. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: The F-number of the optical system is ≤1.

9.

8. The forward-looking ultra-wide-angle binocular camera 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.

9. The forward-looking ultra-wide-angle binocular camera according to claim 1, characterized in that: A filter is provided on the rear side of the sixth lens.

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