Six-piece type side rear-view camera

Abstract

The utility model relates to a six-piece type side rear-view camera. An optical system of the camera is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. Under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a meniscus concave negative lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and all the lenses are made of glass materials. Wherein the first lens is a glass aspheric lens, and the third lens and the fourth lens form a balsaming lens group. While 3M clear imaging is realized, the number of sheets is relatively small and the appearance size is relatively small.

Description

Technical Field

[0001] The utility model relates to a six-piece side rear-view camera, and relates to the technical field of lenses. Background Art

[0002] With the development of automobile safety technology, the vehicle-mounted vision system has gradually become an important component of the automotive electronic system. In order to achieve the goal of safe driving, different parts of the car have begun to install the vehicle-mounted vision system with the vehicle-mounted camera module as the core. For example, installing it in front of the A-pillar can effectively reduce the visual blind spots on both sides of the front of the car, and installing it on the lower side of the trunk of the vehicle can effectively reduce the visual blind spots on the rear side when reversing. The side rear-view camera came into being in this context. It is generally installed on the front fender of the vehicle. The field of view of the camera is generally about 90°, and the detection distance is also about 80m. It is mainly used for scene applications such as vehicle lane change and merging into other roads. The market is constantly pursuing higher pixel density and longer detection distance, because this means higher accuracy and practicality, but this often leads to an increase in the number of lenses, which is not conducive to market popularization. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a six-piece side rear-view camera.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a six-piece side rear-view camera, the optical system of the camera is composed of a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from left to right along the incident light path of the light; without considering the backcurvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens, the object side surface of which is convex, and the image side surface is concave; the second lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the third lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the fourth lens is a meniscus concave negative lens, the object side surface of which is concave, and the image side surface is convex; the fifth lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the sixth lens is a plano-concave negative lens, the object side surface of which is concave, and the image side surface is flat; all lenses are made of glass material, wherein the first lens is a glass aspheric lens, and the third and fourth lenses form 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, the second lens, the third lens, the fourth lens, the fifth lens, and the 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<-1.0,1.0<f2 / f<2.0,1.0<f3 / f<2.0,-2.0<f4 / f<-1.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0。

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

[0007] Preferably, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 6.5 to 7.0 mm; the air gap between the second lens and the aperture is 0.1 to 0.5 mm; the aperture is on the third lens; the third lens and the fourth lens are a cemented lens group, and the air gap is 0 mm; the air gap between the fourth lens and the fifth lens is 1.0 to 1.5 mm; the air gap between the fifth lens and the sixth lens is 0.1 to 0.5 mm.

[0008] Preferably, the aspheric curve equation of the first lens is expressed as:

[0009]

[0010] Among them, Z is the height of the aspheric surface from the vertex of the aspheric surface when it is at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-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 relationship: TTL / f≤5.0.

[0012] Preferably, the F number of the optical system is ≤1.8.

[0013] Preferably, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≤1.0.

[0014] Preferably, the aperture stop of the optical system is located on the object side of the third lens.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The imaging angle of the lens to the object is greater than 80 degrees. It has the advantages of 3M imaging clarity, large aperture, low tolerance sensitivity and good high and low temperature stability. At the same time, it can more comprehensively monitor the side and rear of the vehicle and the distant scene;

[0017] 2. Through the reasonable matching of optical lenses, the system structure is compact and reasonable, easy to assemble, with low tolerance sensitivity, and more suitable for large-scale high-yield production;

[0018] 3. The all-glass structure has high stability, can make good compensation for focal plane displacement at high and low temperatures, and has adaptability to complex environments;

[0019] 4. The axial chromatic aberration, vertical chromatic aberration and high-order chromatic aberration are corrected to ensure that the imaging system can have high imaging quality even at a large angle.

[0020] 5. Give full play to the advantages of aspherical lenses in correcting aberrations, meet the requirements of high-definition imaging, have a smaller lens outer diameter and a shorter total optical length, and ensure the miniaturization of the lens.

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is the axial chromatic aberration diagram of the full working band of the utility model;

[0024] Figure 3 It is the vertical axis chromatic aberration diagram of the full working band of the utility model;

[0025] Figure 4 It is the field curvature distortion diagram of the full working band of the utility model;

[0026] In the figure: STO-aperture; L1-first lens; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-equivalent glass plate 1; L8-equivalent glass plate 2; IMA-imaging surface. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] like Figures 1 to 4 As shown, this embodiment provides a six-lens side rear-view camera, the optical system of the camera is composed of a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from left to right along the incident light path of the light; without considering the backcurvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens, the object side surface of which is convex, and the image side surface is concave; the second lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the third lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the fourth lens is a meniscus concave negative lens, the object side surface of which is concave, and the image side surface is convex; the fifth lens is a biconvex positive lens, the object side surface of which is convex, and the image side surface is convex; the sixth lens is a plano-concave negative lens, the object side surface of which is concave, and the image side surface is flat; all lenses are made of glass material, wherein the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses, the first lens is a glass aspheric lens, and the third and fourth lenses form an achromatic doublet lens group. Reasonable lens matching enables the optical system to achieve small size, 3M, large aperture, day and night confocal, low temperature drift design, and at the same time, the on-axis and off-axis aberrations are well corrected, with good imaging quality, such as Figures 2 to 4 shown.

[0031] In the embodiment of the utility model, the focal length of the optical system is set to f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the 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<-1.0,1.0<f2 / f<2.0,1.0<f3 / f<2.0,-2.0<f4 / f<-1.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0。

[0032] In the embodiment of the utility model, the first lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the second lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the fourth lens satisfies the relationship: 1.6≤N d ≤1.9, 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 relationship: 1.8≤N d ≤2.0, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

[0033] In the embodiment of the utility model, the axial distances between the lenses satisfy the following relationship: the air interval between the first lens and the second lens is 6.5-7.0 mm; the air interval between the second lens and the diaphragm is 0.1-0.5 mm; the diaphragm is on the third lens; the third lens and the fourth lens are a cemented lens group, and the air interval is 0 mm; the air interval between the fourth lens and the fifth lens is 1.0-1.5 mm; the air interval between the fifth lens and the sixth lens is 0.1-0.5 mm.

[0034] In the embodiment of the utility model, the aspheric curve equation of the first lens is expressed as:

[0035]

[0036] Among them, Z is the height of the aspheric surface from the vertex of the aspheric surface when it is at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-order coefficients.

[0037] In the embodiment of the utility model, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤5.0.

[0038] In the embodiment of the utility model, the F number of the optical system is ≤1.8.

[0039] In the embodiment of the utility model, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≤1.0.

[0040] In an embodiment of the present invention, the aperture stop of the optical system is located on the object side of the third lens.

[0041] In an embodiment of the present invention, a filter is disposed on the rear side of the sixth lens.

[0042] An imaging method for a six-lens side rear view camera is performed according to the following steps: the optical system of the camera is imaged after passing through a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence.

[0043] In the embodiment of the utility model, the technical indicators achieved by the optical system of this embodiment are as follows:

[0044] (1) Focal length: 6.0 ≤ EFFL ≤ 7.0 mm;

[0045] (2) Aperture F ≤ 1.8;

[0046] (3) Field of view: 2w ≥ 80°;

[0047] (4) Working band: visible light band.

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

[0049]

[0050]

[0051] The aspheric coefficients of the aspheric lenses of the optical system of this embodiment are as follows:

[0052]

[0053] The optical system of this embodiment reduces the total length of the lens and the radial dimensions of each lens while meeting the 3M imaging performance requirements of the lens by reasonably allocating the optical focal length, surface shape, center thickness of each lens, and axial distance between each lens, thereby miniaturizing the lens group.

[0054] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A six-piece side rear view camera, characterized in that: The optical system of the camera consists of a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens and a sixth lens, which are arranged in sequence from left to right along the incident optical path of the light; without considering the backcurvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens, whose object side surface is convex and whose image side surface is concave; the second lens is a biconvex positive lens, whose object side surface is convex and whose image side surface is convex; the third lens is a biconvex positive lens, whose object side surface is convex and whose image side surface is convex; the fourth lens is a meniscus concave negative lens, whose object side surface is concave and whose image side surface is convex; the fifth lens is a biconvex positive lens, whose object side surface is convex and whose image side surface is convex; the sixth lens is a plano-concave negative lens, whose object side surface is concave and whose image side surface is flat; all lenses are made of glass material, among which the first lens is a glass aspheric lens, and the third and fourth lenses form a cemented lens group.

2. The six-piece side rear view camera according to claim 1, characterized in that: Assume that the focal length of the optical system is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are f1, f2, f3, f4, f5, and f6 respectively, where f1, f2, f3, f4, f5, and f6 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,1.0<f2 / f<2.0,1.0<f3 / f<2.0,-2.0<f4 / f<-1.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0。 3. The six-piece side rear view camera according to claim 1, characterized in that: The first lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the second lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the fourth lens satisfies the relationship: 1.6≤N d ≤1.9, 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 relationship: 1.8≤N d ≤2.0, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

4. The six-piece side rear view camera according to claim 1, characterized in that: The axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 6.5 to 7.0 mm; the air gap between the second lens and the aperture is 0.1 to 0.5 mm; the aperture is on the third lens; the third lens and the fourth lens are a cemented lens group, and the air gap is 0 mm; the air gap between the fourth lens and the fifth lens is 1.0 to 1.5 mm; the air gap between the fifth lens and the sixth lens is 0.1 to 0.5 mm.

5. The six-piece side rear view camera according to claim 1, characterized in that: The aspheric curve equation of the first lens is: Among them, Z is the height of the aspheric surface from the vertex of the aspheric surface when it is at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-order coefficients.

6. The six-piece side rear view camera according to claim 1, characterized in that: The total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤5.

0.

7. The six-piece side rear view camera according to claim 1, characterized in that: The F number of the optical system is ≤1.

8.

8. The six-piece side rear view 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: H / f≤1.

0.

9. The six-piece side rear view camera according to claim 1, characterized in that: The aperture stop of the optical system is located on the object side of the third lens.

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