Six-piece 8M foresight main camera

Abstract

The utility model relates to a six-piece 8M foresight main camera. An optical system of the lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. The lenses are all made of glass materials, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses, the sixth lens is a glass aspheric lens, and the fourth lens and the fifth lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens and the axial distance between the lenses, the total length of the lens and the radial size of each lens are reduced while the 8M imaging performance of the six-piece lens is met to replace the requirements of a foresight wide-angle camera and a foresight narrow-angle camera, and the miniaturization of the lens group is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, in particular to a six-piece 8M front view main camera. Background Art

[0002] With the development of automotive safety technologies, in-vehicle vision systems have gradually become an important part of automotive electronic systems. To achieve the goal of safe driving, in-vehicle vision systems with in-vehicle camera modules as the core have started to be installed in different parts of vehicles. Front view cameras: mainly installed on the front windshield, used to achieve visual perception and recognition functions during driving, and can be further divided into front view main cameras, front view narrow-angle cameras, and front view wide-angle cameras according to functions. Among them, the main function of the front view wide-angle camera is to identify objects at relatively close distances, mainly used in scenarios such as urban road conditions and low-speed driving. Its field of view angle is between 120° and 150°, and the detection distance is about 50m. Therefore, if 8MP lenses are widely used in vehicles, this camera can be dispensed with, reducing the cost of the front view module and using a lower number of lenses, which is conducive to further market promotion and popularization. Content of the Utility Model

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a six-piece 8M front view main camera, which can achieve 8MP imaging while realizing visual perception and recognition functions during driving, so as to replace the front view wide-angle camera and the front view narrow-angle camera, and form a front view camera module with a single lens, greatly reducing costs and improving market popularity.

[0004] To solve the above technical problem, the technical solution of the utility model is: a six-piece 8M front view main camera, the optical system of the lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from left to right along the light incident optical path; without considering the anti-curvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens; the second lens is a meniscus concave negative lens; 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 meniscus convex positive lens; the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are glass spherical lenses, and the sixth lens is a glass aspherical lens, wherein the fourth lens and the fifth lens are a cemented lens group.

[0005] Preferably, the object side of the first lens is convex, and the image side is concave; the object side of the second lens is convex, and the image side is concave; the object side of the third lens is convex, and the image side is convex; the object side of the fourth lens is convex, and the image side is convex; the object side of the fifth lens is concave, and the image side is concave; the object side of the sixth lens is concave, and the image side is convex.

[0006] Preferably, 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 ratios with f: -6.0 < f1 / f < -5.0, -3.0 < f2 / f < -2.0, 2.0 < f3 / f < 3.0, 2.0 < f4 / f < 3.0, -2.0 < f5 / f < -1.0, 2.0 < f6 / f < 3.0.

[0007] 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: 2.0 ≤ N d ≤ 2.3, 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 ≤ 2.01, V d ≤ 50.0; the sixth lens satisfies the relationship: 1.7 ≤ N d ≤ 2.0, V d ≤ 50.0; where N d is the refractive index, and V d is the Abbe number.

[0008] Preferably, 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: 4.5 - 5.0 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: 0.1 - 0.5 mm; the fourth lens and the fifth lens are a cemented doublet with an air gap of 0 mm; the air gap between the fifth lens and the sixth lens is: 0.1 - 0.5 mm.

[0009] Preferably, the sixth lens is an aspherical lens; the expression of the aspheric curve equation is:

[0010]

[0011] where Z is the sagitta height from the vertex of the aspheric surface at the position with a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-order term coefficients.

[0012] Preferably, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f ≤ 15.0.

[0013] Preferably, the F-number of the optical system ≤ 1.8.

[0014] Preferably, the image height H of the optical system and the focal length f of the optical system satisfy: H / f ≥ 1.0.

[0015] Preferably, the aperture stop of the optical system is located between the third lens and the fourth lens, and a filter is provided on the image side of the sixth lens.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] 1. The imaging angle of the lens for an object is greater than 178 degrees. At the same time, it has the advantages of ultra-high 8M imaging clarity, large light-gathering aperture, low tolerance sensitivity, and good high and low temperature stability. Meanwhile, it can monitor the external scene of the vehicle more comprehensively;

[0018] 2. By reasonably matching each optical lens, the system structure is compact and reasonable, easy to assemble, with low tolerance sensitivity, and more suitable for large-scale high-yield production;

[0019] 3. Adopting an all-glass structure, it has high stability, can adapt to harsh environments, and at the same time gives full play to the advantage of aspherical lenses in correcting aberrations. While meeting high-definition imaging, it has a smaller lens outer diameter and a shorter total optical length, ensuring the miniaturization of the lens.

[0020] 4. It can make better compensation for the focal plane displacement at high and low temperatures and has adaptability to complex environments;

[0021] 5. It corrects axial chromatic aberration, lateral chromatic aberration, and higher-order chromatic aberration in each axis, ensuring that the imaging system also has high imaging quality at large angles.

[0022] The following further describes the present utility model in detail with reference to the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic optical structure diagram of an embodiment of the present utility model;

[0024] Figure 2 is an axial chromatic aberration diagram of the full working wavelength band of an embodiment of the present utility model;

[0025] Figure 3 is a lateral chromatic aberration diagram of the full working wavelength band of an embodiment of the present utility model;

[0026] Figure 4 is a field curvature and distortion diagram of the full working wavelength band of an embodiment of the present utility model.

[0027] In the figure: STO - diaphragm; 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 plane. Detailed implementation mode

[0028] To make the above - mentioned features and advantages of the present utility model more obvious and understandable, specific embodiments are given below in conjunction with the accompanying drawings and described in detail as follows.

[0029] As Figures 1 to 4 shown, a six - lens 8M front - view main camera, the optical lens is successively provided with a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, and a sixth lens from the object side to the image side, and a filter L7 and a chip protection glass (CG) L8 are successively arranged from the sixth lens to the image side.

[0030] In the embodiment of the present utility model, the diaphragm of the optical system is located between the third lens and the fourth lens, and a filter is arranged on the image side of the sixth lens.

[0031] In the embodiment of the present utility model, the first lens and the second lens are both glass lenses with negative optical power, which can adjust large - angle light rays, and the glass aspheric surfaces therein have the effect of reducing the distortion of the optical system. The fourth lens and the fifth lens form an achromatic doublet. The reasonable combination of lenses enables the optical system to achieve a six - lens, 8M, ultra - wide - angle, large - aperture, day - night confocal, and low - temperature - drift design. At the same time, the on - axis and off - axis aberrations are well corrected, and it has good imaging quality, as Figures 2 to 4 shown. The technical indicators achieved by the optical system of this embodiment are as follows:

[0032] (1) Focal length: 1.0 ≤ EFFL ≤ 2.0 mm;

[0033] (2) Aperture F ≤ 1.8;

[0034] (3) Field of view angle: 2w ≥ 178°;

[0035] (4) Working wavelength band: visible light band.

[0036] To achieve the above - mentioned design parameters, the specific design adopted by the optical system of this embodiment is shown in the following table:

[0037]

[0038]

[0039] The aspheric coefficients of the aspheric lenses of the optical system of this embodiment are as follows in the table:

[0040]

[0041] In this embodiment, the optical system miniaturizes the lens group by reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis distance between each lens, etc., while meeting the imaging performance requirements of the six-piece lens for 8M, and reducing the total length of the lens and the radial dimensions of each lens.

[0042] The present utility model is not limited to the above-mentioned optimal embodiment, and anyone can obtain other various forms of six-piece 8M front-view main cameras under the inspiration of the present utility model. All equivalent changes and modifications made according to the scope of the patent application of the present utility model shall fall within the scope covered by the present utility model.

Claims

1. A six-element 8M front-view main camera, including an optical system, characterized in that: The optical system is composed of a first lens, a second lens, a third lens, an aperture, 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; the second lens is a meniscus concave negative lens; 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 meniscus convex positive lens; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses, the sixth lens is a glass aspheric lens, wherein the fourth lens and the fifth lens are a cemented lens group; The object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is concave, and the image side surface is concave; the object side surface of the sixth lens is concave, and the image side surface is convex.

2. The six-chip 8M front-view main 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: -6.0 <f1 / f<-5.0,-3.0<f2 / f<-2.0,2.0<f3 / f<3.0,2.0<f4 / f<3.0,-2.0<f5 / f<-1.0,2.0<f6 / f<3.0。 3. The six-chip 8M front-view main 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: 2.0≤N d ≤2.3, 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 ≤2.01,V d ≤50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

4. The six-chip 8M front-view main camera according to claim 1, characterized in that: 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 4.5-5.0 mm; the air gap between the third lens and the aperture is 0.1-0.5 mm; the air gap between the aperture and the fourth lens is 0.1-0.5 mm; the fourth lens and the fifth lens are glued sheets, and the air gap is 0 mm; the air gap between the fifth lens and the sixth lens is 0.1-0.5 mm.

5. The six-chip 8M front-view main camera according to claim 1, characterized in that: The sixth lens is an aspherical lens; the aspherical curve equation is expressed as: 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-chip 8M front-view main 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 the following condition: TTL / f≤15.

0.

7. The six-chip 8M front-view main camera according to claim 1, characterized in that: The F number of the optical system is ≤1.

8.

8. The six-chip 8M front-view main 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.

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