An ultra-wide-angle 8M front-view main camera

Abstract

The utility model relates to an ultra-wide-angle 8M front-view main 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, the sixth lens and the seventh lens in sequence. A stop is arranged between the third lens and the fourth lens, wherein the fifth lens and the sixth lens are closely connected to form a cemented lens group; the first lens is a meniscus concave negative lens, the second lens is a double concave negative lens, the third lens is a double convex positive lens, the fourth lens is a double convex positive lens, the fifth lens is a double convex positive lens, the sixth lens is a double concave negative lens, the seventh lens is a double convex positive lens, the first, third, fourth, fifth and sixth lenses are glass spherical lenses, and the second and seventh lenses are glass aspherical lenses. The imaging angle of the object is greater than 170 degrees, and it has an ultra-high 8M imaging clarity, and can monitor the scene outside the vehicle more comprehensively.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, in particular to an ultra-wide-angle 8M front-view main camera. Background Art

[0002] Vehicle autonomous driving includes perception, judgment and execution, and perception is the source of the whole process and an important module of the autonomous driving system. During the driving process of the vehicle, the perception system will collect information about the surrounding environment in real time through the camera module, which is equivalent to the "eyes" of the autonomous driving car, and can help the car achieve the same observation ability as human drivers. The front-view camera installed on the front windshield is used to realize the visual perception and recognition function of driving. According to the function, it can be divided into the front-view main camera, the front-view narrow-angle camera and the front-view wide-angle camera. However, the use of three cameras greatly increases the cost of the entire camera module, which is not conducive to the popularization of the market. Among them, the front-view wide-angle camera is mainly used to identify objects at a close distance. It is mainly used in scenes such as urban road conditions and low-speed driving. Its field of view is 120°~150° and the detection distance is about 50m. Therefore, if the ultra-wide-angle 8MP lens is installed on a large scale, this camera can be eliminated, thereby reducing costs and increasing market popularity. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide an ultra-wide-angle 8M front-view main camera with a large imaging angle, meeting the 8M ultra-wide-angle imaging performance requirements of the lens, and having a smaller outer size.

[0004] The utility model is implemented by the following scheme: an ultra-wide-angle 8M front-view main 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, the sixth lens and the seventh lens in sequence, an aperture is arranged between the third lens and the fourth lens, wherein the fifth lens and the sixth lens are closely connected to form a cemented lens group; the first lens is a meniscus concave negative lens, the second lens is a double concave negative lens, the third lens is a double convex positive lens, the fourth lens is a double convex positive lens, the fifth lens is a double convex positive lens, the sixth lens is a double concave negative lens, the seventh lens is a double convex positive lens, the first, third, fourth, fifth and sixth lenses are glass spherical lenses, and the second and seventh 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, the sixth lens, and the 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: -2.0 <f1 / f<-1.0,-3.0<f2 / f<-2.0,2.0<f3 / f<3.0,2.0<f4 / f<3.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0,2.0<f7 / f<3.0。

[0006] Furthermore, the first lens satisfies the relationship: 2.0≤Nd≤2.3, Vd≤50.0; the second lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the third lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the fourth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the fifth lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the sixth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the seventh lens satisfies the relationship: 1.7≤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 4.1~4.5mm; the air gap between the second lens and the third lens is 0.5~1.0mm; the air gap between the third lens and the aperture is 1.5~2.0mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; and the air gap between the sixth lens and the seventh lens is 1.0~1.5mm.

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

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

[0010] 1. The imaging angle of the lens to the object is greater than 170 degrees. It has the advantages of ultra-high 8M imaging clarity, large aperture, low tolerance sensitivity and good high and low temperature stability. At the same time, it can monitor the scene outside the car more comprehensively.

[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 and can adapt to harsh environments. It also gives full play to the advantages of aspherical lenses in correcting aberrations. While meeting high-definition imaging, it has a smaller lens outer diameter and shorter total optical length to ensure the miniaturization of the lens.

[0013] 4. Able to make good compensation for focal plane displacement at high and low temperatures, and have adaptability to complex environments;

[0014] 5. 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.

[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 1 It is a schematic diagram of the structure of the optical system of the camera of the present invention;

[0017] Figure 2 It is the axial chromatic aberration diagram of the camera of the present invention in the full working band;

[0018] Figure 3 It is the vertical axis chromatic aberration diagram of the camera of the present invention in the full working band;

[0019] Figure 4 It is a field curvature distortion diagram of the full working band of the camera of the present invention;

[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-seventh lens; L8-equivalent glass plate; L9-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 4As shown, an ultra-wide-angle 8M front-view main 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, the sixth lens and the seventh lens in sequence, an aperture is provided between the third lens and the fourth lens, wherein the fifth lens and the sixth lens are closely connected to form a cemented lens group; without considering the recurvature 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 double concave negative lens, whose object side surface is concave and whose image side surface is concave. The first, second, third, fourth, fifth and sixth lenses are glass spherical lenses, and the second and seventh lenses are glass aspherical lenses.

[0024] The first and second lenses have negative focal lengths and can adjust large-angle light. The glass aspheric surface also reduces the distortion of the optical system. The fifth and sixth lenses form an achromatic doublet. Reasonable lens matching enables the optical system to achieve 8M, ultra-wide angle, large aperture, day and night confocal, and low-temperature drift design. 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, the sixth lens, and the 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: -2.0 <f1 / f<-1.0,-3.0<f2 / f<-2.0,2.0<f3 / f<3.0,2.0<f4 / f<3.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0,2.0<f7 / f<3.0。

[0026] In this embodiment, the first lens satisfies the relationship: 2.0≤Nd≤2.3, Vd≤50.0; the second lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the third lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the fourth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the fifth lens satisfies the relationship: 1.5≤Nd≤1.8, Vd≥50.0; the sixth lens satisfies the relationship: 1.7≤Nd≤2.0, Vd≤50.0; the seventh lens satisfies the relationship: 1.7≤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 4.1-4.5 mm; the air gap between the second lens and the third lens is 0.5-1.0 mm; the air gap between the third lens and the aperture is 1.5-2.0 mm; the aperture is located on the fourth lens S1; the air gap between the fourth lens and the fifth lens is 0.1-0.5 mm; the fifth lens and the sixth lens are glued sheets, and the air gap is 0 mm; the air gap between the sixth lens and the seventh lens is 1.0-1.5 mm.

[0028] In this embodiment, the aspheric curve equations of the second and seventh lenses are expressed as follows:

[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≤8.0.

[0034] In this embodiment, the F number of the optical system is ≤1.6.

[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 seventh lens.

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

[0038] (1) Focal length: 3.0 ≤ EFFL ≤ 4.0 mm;

[0039] (2) Aperture F ≤ 1.6;

[0040] (3) Field of view: 2w ≥ 170°;

[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 focal length, surface shape, center thickness of each lens, and axial distance between each lens, etc., to meet the 8M ultra-wide-angle imaging performance requirements of the lens, while reducing the total length of the lens and the radial size of each lens, so as to miniaturize the lens group. While realizing the visual perception and recognition function of driving, 8MP imaging is achieved, which can replace the front wide-angle camera and the front narrow-angle camera, and realize the front camera module composed of a single lens, greatly reducing the cost to increase market popularity.

[0045] 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.

[0046] 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).

[0047] 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.

[0048] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated forming process.

[0049] 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. An ultra-wide-angle 8M front-view main camera, characterized by: The lenses with optical power along the incident optical path of the camera are, in sequence, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens. An aperture is disposed between the third lens and the fourth lens. The fifth lens and the sixth lens are closely adhered to form a cemented lens group. The first lens is a meniscus concave negative lens, the second lens is a biconcave negative lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a biconcave negative lens, and the seventh lens is a biconvex positive lens. The first, third, fourth, fifth, and sixth lenses are glass spherical lenses, and the second and seventh lenses are glass aspherical lenses. 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, the sixth lens, and the seventh lens are f1, f2, f3, f4, f5, f6, and f7, respectively. f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratios with f: -2.0 < f1 / f < -1.0, -3.0 < f2 / f < -2.0, 2.0 < f3 / f < 3.0, 2.0 < f4 / f < 3.0, 1.0 < f5 / f < 2.0, -2.0 < f6 / f < -1.0, 2.0 < f7 / f < 3.

0. The first lens satisfies the relation: 2.0 ≤ Nd ≤ 2.3, Vd ≤ 50.

0. The second lens satisfies the relation: 1.5 ≤ Nd ≤ 1.8, Vd ≥ 50.

0. The third lens satisfies the relation: 1.7 ≤ Nd ≤ 2.0, Vd ≤ 50.

0. The fourth lens satisfies the relation: 1.7 ≤ Nd ≤ 2.0, Vd ≤ 50.

0. The fifth lens satisfies the relation: 1.5 ≤ Nd ≤ 1.8, Vd ≥ 50.

0. The sixth lens satisfies the relation: 1.7 ≤ Nd ≤ 2.0, Vd ≤ 50.

0. The seventh lens satisfies the relation: 1.7 ≤ Nd ≤ 2.0, Vd ≥ 50.

0. Here, Nd is the refractive index and Vd is the Abbe number. The air gap between the first lens and the second lens is 4.1 to 4.5 mm. The air gap between the second lens and the third lens is 0.5 to 1.0 mm. The air gap between the third lens and the aperture is 1.5 to 2.0 mm. The air gap between the fourth lens and the fifth lens is 0.1 to 0.5 mm. The air gap between the sixth lens and the seventh lens is 1.0 to 1.5 mm. The focal length of the optical system: 3.0 ≤ EFFL ≤ 4.0 mm.

2. The ultra-wide-angle 8M front-view main camera according to claim 1, characterized in that: A filter is disposed at the rear side of the seventh lens.

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