8M foresight main camera suitable for vehicle-mounted foresight camera shooting

Abstract

An optical system of the camera is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave positive lens, the third lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a biconvex positive lens, and the seventh 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, the seventh lens is a biconvex positive lens, the fifth lens and the sixth lens form a balsaming lens, and the third lens, the fourth lens, the fifth lens and the sixth lens are glass spherical lenses. The first lens, the second lens and the seventh lens are glass aspheric lenses. According to the front-view camera module, the visual perception and recognition functions of driving are achieved, meanwhile, 8MP imaging is achieved, a front-view wide-angle camera and a front-view narrow-angle camera can be replaced, the front-view camera module is formed by a single lens, the cost is greatly reduced, and the market popularization degree is improved.

Description

Technical field:

[0001] The utility model belongs to the technical field of lenses, and in particular relates to an 8M front-view main camera suitable for vehicle-mounted front-view photography. Background technology:

[0002] At present, the on-board cameras installed in the car are mainly divided into five categories according to the installation position: front-view camera, surround-view camera, rear-view camera, side-view camera and built-in camera. Among them, the front-view camera is mainly installed on the front windshield 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 has greatly increased the cost of the entire camera module, which is not conducive to the popularization of the market. Among them, the function of the front-view wide-angle camera is mainly to identify objects at a close distance. It is mainly used in urban road conditions, low-speed driving and other scenes. Its field of view angle 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:

[0003] The present invention aims to improve the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide an 8M front-view main camera suitable for vehicle-mounted front-view photography, which has a reasonable design and can realize 8MP imaging while realizing the visual perception and recognition functions of driving.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an 8M front-view main camera suitable for vehicle-mounted front-view photography, the optical system of the camera is composed of 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 the light, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave positive 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 fifth lens and the sixth lens form a cemented lens group, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the first lens, the second lens and the seventh lens are all glass aspherical lenses.

[0005] Furthermore, 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 convex, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex.

[0006] Furthermore, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 1.5 to 2.0 mm; the air gap between the second lens and the third lens is 6.0 to 6.5 mm; the air gap between the third lens and the aperture is 0.5 to 1.0 mm; the air gap between the aperture and the fourth lens is 0.0 to 0.5 mm; the air gap between the fourth lens and the fifth lens is 0.1 to 0.5 mm; and the air gap between the sixth lens and the seventh lens is 0.5 to 1.0 mm.

[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 f respectively. 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 , where f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Satisfies the following ratio with f: -3.0 <f 1 / f<-2.0,7.0 <f 2 / f<8.0,2.0 <f 3 / f<3.0,1.0 <f 4 / f<2.0,1.0 <f 5 / f<2.0,-1.0 <f 6 / f<0.0,1.0 <f 7 / f<2.0.

[0008] Furthermore, the first lens satisfies the relationship: 1.5≤N d ≤1.8, 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 aspheric curve equations of the first lens, the second lens and the seventh lens are expressed as:

[0010]

[0011] Where Z is the height of the aspheric surface from the vertex of the aspheric surface at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α 1 , α 2 , α 3 , α 4 , α 5 , α 6 , α 7 , α 8 All are high-order coefficients.

[0012] Furthermore, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤5.0.

[0013] Furthermore, the F number of the optical system is ≤1.6.

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

[0015] Compared with the prior art, the utility model has the following effects: the utility model is reasonably designed, and realizes 8MP imaging while realizing the visual perception and recognition functions of driving, thereby replacing the front wide-angle camera and the front narrow-angle camera, realizing a single-lens front camera module, greatly reducing costs to increase market popularity. Description of the drawings:

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

[0017] Figure 2 This is a full-band axial chromatic aberration diagram of an embodiment of the utility model;

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

[0019] Figure 4 This is a field curvature distortion diagram for the entire working band of an embodiment of the utility model.

[0020] In the figure:

[0021] STO-aperture; L1-first lens; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-filter; L9-protective glass; IMA-imaging surface. Specific implementation method:

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 As shown, the utility model is an 8M front-view main camera suitable for vehicle-mounted front-view photography. The optical system of the camera consists of 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. 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 positive 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 fifth lens and the sixth lens form a cemented lens group, and each lens is made of glass material. Specifically: the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, the first lens, the second lens and the seventh lens are all glass aspherical lenses, which have the function of reducing the distortion of the optical system, wherein the aspheric glass lens with negative optical power can adjust large-angle light; the fifth lens and the sixth lens form an achromatic double cemented lens.

[0024] In this embodiment, 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 convex, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex.

[0025] In this embodiment, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 1.5 to 2.0 mm; the air gap between the second lens and the third lens is 6.0 to 6.5 mm; the air gap between the third lens and the aperture is 0.5 to 1.0 mm; the air gap between the aperture and the fourth lens is 0.0 to 0.5 mm; the air gap between the fourth lens and the fifth lens is 0.1 to 0.5 mm; and the air gap between the sixth lens and the seventh lens is 0.5 to 1.0 mm.

[0026] 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 f respectively. 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 , where f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Satisfies the following ratio with f: -3.0 <f 1 / f<-2.0,7.0 <f 2 / f<8.0,2.0 <f 3 / f<3.0,1.0 <f 4 / f<2.0,1.0 <f 5 / f<2.0,-1.0 <f 6 / f<0.0,1.0 <f 7 / f<2.0.

[0027] In this embodiment, the first lens satisfies the relationship: 1.5≤N d ≤1.8, 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.

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

[0029]

[0030] Where Z is the height of the aspheric surface from the vertex of the aspheric surface at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α 1 , α 2 , α 3 , α 4 , α 5 , α 6 , α 7 , α 8 All are high-order coefficients.

[0031] Specifically, the aspheric coefficients of each aspheric lens of the optical system 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: TTL / f≤5.0.

[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 L8 is disposed on the right side of the seventh lens, and a protective glass L9 is disposed on the right side of the filter.

[0037] In this embodiment, the reasonable lens combination enables the optical system to achieve 8M, ultra-wide angle, 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 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 ≤ 1.6;

[0040] (3) Field of view: 2w ≥ 171°;

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

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

[0043]

[0044] In this embodiment, 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 on-axis distance between each lens, thereby miniaturizing the lens group.

[0045] In this embodiment, when the 8M front-view main camera suitable for vehicle-mounted front-view photography is imaging, the light path sequentially enters the first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the filter and the protective glass to perform imaging.

[0046] The advantages of the utility model are:

[0047] 1. The camera has an imaging angle of more than 171 degrees, and 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;

[0048] 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;

[0049] 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.

[0050] 4. Able to make good compensation for focal plane displacement at high and low temperatures, and have adaptability to complex environments;

[0051] 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.

[0052] 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 where it is obviously impossible to use an one-piece molding process).

[0053] 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.

[0054] 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.

[0055] 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 suitable for vehicle-mounted front-view photography, characterized in that: The optical system of the camera consists of 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 light path of the light. The first lens is a meniscus concave negative lens, the second lens is a meniscus concave positive 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, the seventh lens is a biconvex positive lens, the fifth lens and the sixth lens form a cemented lens group, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the first lens, the second lens and the seventh lens are all glass aspherical lenses.

2. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 1, characterized in that: 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 convex, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex.

3. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 2, 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 1.5 to 2.0 mm; the air gap between the second lens and the third lens is 6.0 to 6.5 mm; the air gap between the third lens and the aperture is 0.5 to 1.0 mm; the air gap between the aperture and the fourth lens is 0.0 to 0.5 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 0.5 to 1.0 mm.

4. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 2, 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, and f7, respectively, where f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -3.0 <f1 / f<-2.0,7.0<f2 / f<8.0,2.0<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。 5. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 1, characterized in that: The first lens satisfies the relationship: 1.5≤N d ≤1.8, 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.

6. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 1, characterized in that: The aspheric curve equations of the first lens, the second lens and the seventh lens are as follows: 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 suitable for vehicle-mounted front-view photography 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.

8. The 8M front-view main camera suitable for vehicle-mounted front-view photography according to claim 1, characterized in that: The F number of the optical system is ≤1.

6.

9. The 8M front-view main camera suitable for vehicle-mounted front-view photography 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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