An 8M front-view main camera

Abstract

The utility model relates to an 8M front-view main camera, including a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from left to right along the incident light path of light; 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 biconvex positive lens, the sixth lens is a biconcave negative lens, and the seventh lens is a biconvex positive lens. The utility model has a reasonable design and a simple structure. By reasonably allocating the focal length, surface shape, center thickness of each lens and axial distance between each lens, the utility model can meet the requirements of the 8M imaging performance of the lens to replace the requirements of the front-view wide-angle camera and the front-view narrow-angle camera, while reducing the total length of the lens and the radial size of each lens, so as to miniaturize the lens group.

Description

Technical Field

[0001] The utility model relates to an 8M front-view main camera. Background Art

[0002] With the development of economy and the improvement of people's quality of life, the annual sales volume of automobiles in my country exceeds 10 million. With the increase of the number of cars in cities, the roads are becoming more and more crowded, and the problem of frequent traffic accidents is becoming increasingly prominent. 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. The on-board front-view camera system is an automobile safety technology with lane departure warning function. The on-board front-view camera module plays an important role as the hardware terminal of the system. Front-view camera: Mainly installed on the front windshield, it is used to realize the visual perception and recognition function of driving. According to the function, it can be divided into front-view main camera, front-view narrow-angle camera and front-view wide-angle camera.

[0003] However, the use of three cameras greatly increases the cost of the entire camera module, which is not conducive to market popularization. The front-view wide-angle camera is mainly used to identify objects at a relatively close distance. It is mainly used in urban road conditions, low-speed driving and other scenes. Its field of view is 120°~150° and the detection distance is about 50m. Therefore, if 8MP lenses are used on a large scale, this camera may not be needed. Utility Model Content

[0004] The utility model improves the above-mentioned problem, that is, the technical problem to be solved by the utility model is to provide an 8M front-view main camera, which can realize 8MP imaging while realizing the visual perception and recognition function of driving, so as to replace the front-view wide-angle camera and the front-view narrow-angle camera, realize a single-lens front-view camera module, greatly reduce costs and improve market popularity.

[0005] The utility model is constructed as follows: it comprises a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from left to right along the incident optical path of light; the first lens is a meniscus concave negative lens, whose object side surface is a convex surface, and whose image side surface is a concave surface; the second lens is a meniscus concave negative lens, whose object side surface is a convex surface, and whose image side surface is a concave surface; the third lens is a biconvex positive lens, whose object side surface is a convex surface, and whose image side surface is a convex surface; the fourth lens is a biconvex positive lens, whose object side surface is a convex surface, and whose image side surface is a convex surface; the fifth lens is a biconvex positive lens, whose object side surface is a convex surface, and whose image side surface is a convex surface; the sixth lens is a biconcave negative lens, whose object side surface is a concave surface, and whose image side surface is a concave surface; the seventh lens is a biconvex positive lens, whose object side surface is a convex surface, and whose image side surface is a convex surface.

[0006] Furthermore, the first, second, third and seventh lenses are glass aspherical lenses, the fourth, fifth and sixth lenses are glass spherical lenses, and the fifth lens and the sixth lens are cemented lens groups.

[0007] 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, f7 respectively, wherein f1, f2, f3, f4, f5, f6, f7 and f satisfy the following ratio: -3.0 <f1 / f<-2.0,-327.0<f2 / f<-326.0,2.0<f3 / f<3.0,1.0<f4 / f<2.0,1.0<f5 / f<2.0,-1.0<f6 / f<0.0,1.0<f7 / f<2.0。

[0008] Furthermore, 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: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh 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.

[0009] Furthermore, the air gap between the first lens and the second lens is 2.0~2.5mm; the air gap between the second lens and the third lens is 2.5~3.0mm; the air gap between the third lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the fourth lens is 0.1~0.5mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; the fifth lens and the sixth lens are a cemented lens group, and the air gap is 0mm; the air gap between the sixth lens and the seventh lens is 0.5~1.0mm.

[0010] Furthermore, the first lens, the second lens, the third lens and the seventh lens are aspherical lenses, and the aspherical curve equation is expressed as:

[0011] ;

[0012] 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.

[0013] Furthermore, a first equivalent glass plate, a second equivalent glass plate and an imaging surface are sequentially arranged on the rear side of the seventh lens.

[0014] Furthermore, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤5.0.

[0015] Furthermore, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≤1.0.

[0016] Furthermore, the F number of the optical system is ≤1.6.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The imaging angle of the lens to the object is greater than 167 degrees. At the same time, 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; 2. Through the reasonable combination of various 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; 3. The full-glass structure is adopted, which has high stability and can adapt to harsh environments. At the same time, it 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 a shorter optical total length to ensure the miniaturization of the lens; 4. It can make good compensation for the focus displacement at high and low temperatures and has adaptability to complex environments; 5. The axial chromatic aberration, vertical axis chromatic aberration and high-order chromatic aberration are corrected to ensure that the imaging system can have high imaging quality at large angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the optical structure of an embodiment of the utility model;

[0020] Figure 2 This is the axial chromatic aberration diagram of the full working band of the embodiment of the utility model;

[0021] Figure 3 This is a vertical axis chromatic aberration diagram of the entire working band of the embodiment of the utility model;

[0022] Figure 4 This is a field curvature distortion diagram of the full working band of the embodiment of the utility model;

[0023] In the figure: L1-first lens; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-first equivalent glass plate; L9-second equivalent glass plate; IMA-imaging surface; STO-aperture. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example: Figures 1 to 4 As shown, the utility model provides an 8M front-view main camera, including a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 which are arranged in sequence from left to right along the incident light path of the light; the first lens is a meniscus concave negative lens, whose object side surface is a convex surface and the image side surface is a concave surface;

[0026] Without considering the backcurvature caused by the aspheric coefficient, the second lens is a meniscus concave negative lens, whose object side surface is convex and whose image side surface is concave; the third lens is a double convex positive lens, whose object side surface is convex and whose image side surface is convex; the fourth lens is a double convex positive lens, whose object side surface is convex and whose image side surface is convex; the fifth lens is a double convex positive lens, whose object side surface is convex and whose image side surface is convex; the sixth lens is a double concave negative lens, whose object side surface is concave and whose image side surface is concave; the seventh lens is a double convex positive lens, whose object side surface is convex and whose image side surface is convex.

[0027] The first, second, third and seventh lenses are glass aspheric lenses, the fourth, fifth and sixth lenses are glass spheric lenses, and the fifth and sixth lenses are cemented lens groups. The first and second lenses are both glass aspheric surfaces, which have the function of reducing the distortion of the optical system. The aspheric glass lens with negative optical power can adjust the light at a large angle; the fifth and sixth lenses form an achromatic double cemented lens. Through reasonable lens matching, the optical system realizes 8M, ultra-wide angle, large aperture, day and night confocal, and low temperature drift design, and at the same time, the on-axis and off-axis aberrations are well corrected, with good imaging quality.

[0028] In the embodiment of the utility model, 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, f7 respectively, wherein f1, f2, f3, f4, f5, f6, f7 and f satisfy the following ratio: -3.0 <f1 / f<-2.0,-327.0<f2 / f<-326.0,2.0<f3 / f<3.0,1.0<f4 / f<2.0,1.0<f5 / f<2.0,-1.0<f6 / f<0.0,1.0<f7 / f<2.0。

[0029] 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: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh 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.

[0030] In the embodiment of the utility model, the air gap between the first lens and the second lens is 2.0~2.5mm; the air gap between the second lens and the third lens is 2.5~3.0mm; the air gap between the third lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the fourth lens is 0.1~0.5mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; the fifth lens and the sixth lens are a cemented lens group, and the air gap is 0mm; the air gap between the sixth lens and the seventh lens is 0.5~1.0mm.

[0031] In the embodiment of the utility model, the first lens, the second lens, the third lens and the seventh lens are aspherical lenses, and the aspherical curve equation is expressed as:

[0032] ;

[0033] 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.

[0034] In the embodiment of the utility model, a first equivalent glass plate L8, a second equivalent glass plate L9 and an imaging surface IMA are sequentially arranged on the rear side of the seventh lens.

[0035] 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.

[0036] 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.

[0037] In the embodiment of the utility model, the F number of the optical system is ≤1.6.

[0038] The technical indicators achieved by the optical system of the embodiment of the utility model are as follows: (1) focal length: 4.0≤EFFL≤5.0mm; (2) aperture F≤1.6; (3) field of view: 2w≥167°; (4) working band: visible light band.

[0039] To achieve the above design parameters, the specific design parameters of the optical system of the embodiment of the utility model are shown in Table 1 below:

[0040]

[0041] Table 1

[0042] The aspheric coefficients of the aspheric lenses of the optical system of the embodiment of the utility model are as follows in Table 2:

[0043]

[0044] Table 2

[0045] In the embodiment of the utility model, the optical system reduces the total length of the lens and the radial size of each lens while meeting the imaging performance requirements of the lens 8M by reasonably allocating the optical focal length, surface shape, center thickness of each lens and the axial distance between each lens, thereby miniaturizing the lens group.

[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] At the same time, if the above-mentioned utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by 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] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0049] 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.

[0050] 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.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. An 8M front-view main camera, characterized in that: It includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence from left to right along the incident optical path of the light; 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 meniscus concave negative lens, whose object side surface is convex and whose image side surface is concave; 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 biconvex positive lens, whose object side surface is convex 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 biconcave negative lens, whose object side surface is concave and whose image side surface is concave; the seventh lens is a biconvex positive lens, whose object side surface is convex and whose image side surface is convex.

2. The 8M front-view main camera according to claim 1, characterized in that: The first, second, third and seventh lenses are glass aspherical lenses, the fourth, fifth and sixth lenses are glass spherical lenses, and the fifth lens and the sixth lens are cemented lens groups.

3. The 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, the sixth lens and the seventh lens are f1, f2, f3, f4, f5, f6, f7 respectively, wherein f1, f2, f3, f4, f5, f6, f7 and f satisfy the following ratio: -3.0 < f1 / f <-2.0, -327.0 <f2 / f <-326.0,2.0< f3 / f <3.0,1.0< f4 / f <2.0,1.0< f5 / f <2.0,-1.0< f6 / f <0.0,1.0<f7 / f <2.0。 4. The 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: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh 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.

5. The 8M front-view main camera according to claim 1, characterized in that: The air gap between the first lens and the second lens is 2.0~2.5mm; the air gap between the second lens and the third lens is 2.5~3.0mm; the air gap between the third lens and the aperture is 0.1~0.5mm; the air gap between the aperture and the fourth lens is 0.1~0.5mm; the air gap between the fourth lens and the fifth lens is 0.1~0.5mm; the fifth lens and the sixth lens are a cemented lens group with an air gap of 0mm; the air gap between the sixth lens and the seventh lens is 0.5~1.0mm.

6. The 8M front-view main camera according to claim 1, characterized in that: The first lens, the second lens, the third lens and the seventh lens are aspherical lenses, and 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.

7. The 8M front-view main camera according to claim 1, characterized in that: The rear side of the seventh lens is sequentially provided with a first equivalent glass plate, a second equivalent glass plate and an imaging surface.

8. The 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: TTL / f≤5.

0.

9. The 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.

10. The 8M front-view main camera according to claim 1, characterized in that: The F number of the optical system is ≤1.6.

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