Large-aperture six-piece type side rear-view camera

Abstract

The utility model relates to a large-aperture six-piece type side rear-view camera, and the optical system of the camera comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are provided with focal power along an incident light path, and a diaphragm is arranged between the second lens and the third lens. Wherein the third lens and the fourth lens are closely connected to form a balsaming lens group; the first lens is a biconcave negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, the fifth lens is a biconvex positive lens, and the sixth lens is a meniscus concave negative lens. The first lens, the second lens, the third lens and the fourth lens are glass spherical lenses, and the fifth lens and the sixth lens are glass aspheric lenses. The imaging angle of an object is larger than 80 degrees, and meanwhile, the camera has the advantages that the imaging definition is 3M, the F number is 1.4, the tolerance sensitivity is low, the high-low temperature stability is good and the like, and scenes behind the side of a vehicle and far away from the vehicle can be monitored more comprehensively.

Description

Technical Field

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

[0002] In order to reduce the occurrence of traffic accidents and protect their lives and property, people are more willing to buy cars with automobile safety technology when purchasing cars. Automobile safety technologies include: lane departure warning, active collision avoidance, adaptive cruise control, traction control, etc. With the development of automobile safety technology, the vehicle-mounted visual system has gradually become an important component of the automotive electronic system. The side rear-view camera came into being under this background. 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 F number of the side rear-view camera on the market is generally between 1.6-1.8, but a larger aperture is the goal that the market is tirelessly pursuing, 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 this, the purpose of the utility model is to provide a large aperture six-lens side rear view camera, which has fewer lenses and a larger aperture while achieving 3M clear imaging.

[0004] The utility model is implemented by the following scheme: a large aperture six-lens side rear view camera, wherein the optical system of the camera has lenses with optical focal lengths along the incident light path, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence, an aperture is arranged between the second lens and the third lens, wherein the third lens and the fourth lens are closely connected to form a cemented lens group; the first lens is a double concave negative lens, the second lens is a double convex positive lens, the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, the fifth lens is a double convex positive lens, and the sixth lens is a meniscus concave negative lens; the first, second, third and fourth lenses are glass spherical lenses, and the fifth and sixth lenses are glass aspherical lenses.

[0005] Furthermore, 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, 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,-4.0<f6 / f<-3.0。

[0006] Furthermore, the first lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the second lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the third lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the fourth lens satisfies the relationship: 1.6≤Nd≤1.9, Vd≤50.0; the fifth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≥50.0; the sixth lens satisfies the relationship: 1.8≤Nd≤2.0, Vd≤50.0, wherein Nd is the refractive index and Vd is the Abbe constant.

[0007] Furthermore, the air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the third lens is 0.5~1.0mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; and the air gap between the fifth lens and the sixth lens is 0.5~1.0mm.

[0008] Furthermore, a filter is arranged on the rear side of the sixth lens.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] 1. The imaging angle of the lens is greater than 80 degrees, and it has the advantages of 3M imaging clarity, F number 1.4, 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;

[0011] 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;

[0012] 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;

[0013] 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.

[0014] 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.

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the optical system structure of the camera of the utility model;

[0017] Figure 2 This is the axial chromatic aberration diagram of the full working band of the camera of the utility model;

[0018] Figure 3 This is the vertical axis chromatic aberration diagram of the full working band of the camera of the utility model;

[0019] Figure 4 This is the field curvature distortion diagram of the full working band of the camera of the utility model;

[0020] Explanation of the numbers 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; L8-equivalent glass plate; IMA-imaging surface. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] like Figures 1 to 4 As shown, a large aperture six-lens side rear view camera, the optical system of the camera has lenses with optical power along the incident light path, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence, an aperture is arranged between the second lens and the third lens, wherein the third lens and the fourth lens are closely connected to form a cemented lens group; without considering the anticurvature caused by the aspheric coefficient, the first lens is a double concave negative lens, the object side surface is concave, and the image side surface is concave; the second lens is a double convex positive lens, the object side surface is convex, and the image side surface is convex; the third lens is a double convex positive lens, the object side surface is convex, and the image side surface is convex; the fourth lens is a double concave negative lens, the object side surface is concave, and the image side surface is convex; the fifth lens is a double convex positive lens, the object side surface is convex, and the image side surface is convex; the sixth lens is a meniscus concave negative lens, the object side surface is convex, and the image side surface is concave; the lenses are made of glass material, the first, second, third, and fourth lenses are glass spherical lenses, and the fifth and sixth lenses are glass aspherical lenses.

[0024] The third lens and the fourth lens form an achromatic doublet lens. Reasonable lens matching enables the optical system to achieve small size, 3M, F1.4, 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.

[0025] In this embodiment, 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, 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,-4.0<f6 / f<-3.0。

[0026] In this embodiment, the first lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the second lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the third lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the fourth lens satisfies the relationship: 1.6≤Nd≤1.9, Vd≤50.0; the fifth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≥50.0; the sixth lens satisfies the relationship: 1.8≤Nd≤2.0, Vd≤50.0, wherein Nd is the refractive index and Vd is the Abbe constant.

[0027] In this embodiment, the air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the third lens is 0.5~1.0mm, and the aperture is located behind the second lens; the third lens and the fourth lens are a cemented lens group, and the air gap is 0mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; the air gap between the fifth lens and the sixth lens is 0.5~1.0mm.

[0028] In this embodiment, the sixth and seventh lenses are both aspherical lenses, and the aspherical curve equation is expressed as:

[0029]

[0030] Wherein, Z is the height of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; , , , , , , , All are high-order coefficients.

[0031] The aspheric coefficients of each aspheric lens are as follows:

[0032]

[0033] In this embodiment, 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.

[0034] In this embodiment, the F number of the optical system is ≤1.4.

[0035] In this embodiment, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≤1.0.

[0036] In this embodiment, a filter is disposed on the rear side of the sixth lens.

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

[0038] (1) Focal length: 5.0 ≤ EFFL ≤ 6.0 mm;

[0039] (2) Aperture F ≤ 1.4;

[0040] (3) Field of view: 2w ≥ 80°;

[0041] (4) Working band: visible light band.

[0042] To achieve the above design parameters, the specific parameters of the optical system of this embodiment are shown in the following table:

[0043]

[0044] The optical system of this embodiment reasonably distributes the optical focal length, surface shape, center thickness of each lens and the axial distance between each lens, etc., of each lens, while meeting the imaging performance requirements of the lens 3M and F number 1.4, while reducing the total length of the lens and the radial size of each lens, thereby miniaturizing the lens group.

[0045] An imaging method for a large aperture six-lens side rear view camera as described above, wherein light is sequentially formed through a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter.

[0046] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0047] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0048] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0049] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0050] 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 large aperture six-lens side rear view camera, characterized in that: The optical system of the camera has lenses with optical focal length along the incident light path, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence, a stop is arranged between the second lens and the third lens, wherein the third lens and the fourth lens are in close contact to form a cemented lens group; the first lens is a double concave negative lens, the second lens is a double convex positive lens, the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, the fifth lens is a double convex positive lens, and the sixth lens is a meniscus concave negative lens; the first, second, third and fourth lenses are glass spherical lenses, and the fifth and sixth lenses are glass aspherical lenses.

2. The large aperture six-lens side rear view camera according to claim 1, characterized in 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, 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,-4.0< f6 / f<-3.0。 3. The large aperture six-lens side rear view camera according to claim 1, characterized in that: The first lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the second lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the third lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the fourth lens satisfies the relationship: 1.6≤Nd≤1.9, Vd≤50.0; the fifth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≥50.0; the sixth lens satisfies the relationship: 1.8≤Nd≤2.0, Vd≤50.0, wherein Nd is the refractive index and Vd is the Abbe constant.

4. The large aperture six-lens side rear view camera according to claim 1, characterized in that: The air gap between the first lens and the second lens is 4.5~5.0mm; the air gap between the second lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the third lens is 0.5~1.0mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; the air gap between the fifth lens and the sixth lens is 0.5~1.0mm.

5. The large aperture six-lens side rear view camera according to claim 1, characterized in that: A filter is arranged at the rear side of the sixth lens.

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