Ultra-wide-angle high-definition surround-view camera lens

Abstract

The utility model relates to an ultra-wide-angle high-definition surround-view camera lens, an optical system of the camera 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 along a light incident light path, and the fourth lens and the fifth lens form a cemented lens group; under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens is a meniscus concave negative lens, the object side surface is a convex surface, and the image side surface is a concave surface; the third lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface; the fourth lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface; the fifth lens is a biconcave negative lens, the object side surface is a concave surface, and the image side surface is a concave surface; the sixth lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface. The lens is helpful for realizing small-size high-resolution imaging and ultra-wide-angle camera shooting, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, and in particular to an ultra-wide-angle high-definition surround-view camera lens. Background Art

[0002] With the increasing number of vehicles in cities, traffic is becoming more and more congested. The blind spots in the driver's vision in the car make it easy for the vehicle to collide, rub and other accidents when driving at low speed. People realize the importance of reducing or even eliminating the blind spots of the driver's vision, and the vehicle-mounted surround view system came into being. The vehicle-mounted surround view system can collect real-time image information through camera modules with multiple wide-angle lenses around the vehicle, and splice it into a bird's-eye view image covering 360° around the vehicle body, effectively reducing the driver's blind spots. However, the use of multiple lenses greatly increases the cost of building a vehicle-mounted surround view system, which is not conducive to the promotion and popularization of the system. Utility Model Content

[0003] The utility model aims to provide an ultra-wide-angle high-definition surround-view camera lens, which helps to achieve ultra-wide-angle photography while realizing small-volume high-resolution imaging and reducing costs.

[0004] The technical scheme of the utility model is: an ultra-wide-angle high-definition surround-view camera lens, the optical system of the lens is composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the incident light path of the light, wherein the fourth lens and the fifth lens are a cemented lens group; without considering the backcurvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens, the object side surface of which is convex, and the image side surface is concave; the second lens is a meniscus concave negative lens, the object side surface of which is convex, and the image side surface is concave; the third lens is a double convex positive lens, the object side surface of which is convex, and the image side surface is convex; the fourth lens is a double convex positive lens, the object side surface of which is convex, and the image side surface is convex; the fifth lens is a double concave negative lens, the object side surface of which is concave, and the image side surface is concave; the sixth lens is a double convex positive lens, the object side surface of which is convex, and the image side surface is convex; the second lens and the sixth lens are aspheric lenses, and the first lens, the third lens, the fourth lens and the fifth lens are spherical lenses.

[0005] Furthermore, each lens is made of glass material, the second lens and the sixth lens are glass aspherical lenses, and the first lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses.

[0006] Furthermore, the focal length of the optical system is , the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively , , , , , ,in , , , , , and Meet the following ratio: -6.0< / <-5.0, -2.0< / <-1.0, 2.0< / <3.0, 2.0< / <3.0, -2.0< / <-1.0, 2.0< / <3.0.

[0007] Furthermore, the first lens satisfies the relationship: 2.0≤ ≤2.5, ≤50.0; the second lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; the third lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the fourth lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; The fifth lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the sixth lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; where is the refractive index, is the Abbe constant.

[0008] Furthermore, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 3.0-3.5 mm; the air gap between the second lens and the third lens is 1.5-2.0 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 0.5-1.0 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.

[0009] Furthermore, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤15.0.

[0010] Furthermore, the F number of the optical system is ≤2.0.

[0011] Furthermore, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≥1.0.

[0012] Furthermore, a filter is arranged on the image side of the sixth lens.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. This lens helps achieve high-resolution imaging in a small size while realizing ultra-wide-angle photography, thereby realizing a panoramic view system with fewer lenses and reducing costs.

[0015] 2. The imaging angle of the lens to the object is greater than 200 degrees. It has the advantages of high 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 vehicle more comprehensively.

[0016] 3. By reasonably matching the 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.

[0017] 4. The all-glass structure has high operating environment stability, and can make good compensation for focal plane displacement at high and low temperatures, and has adaptability to complex environments.

[0018] 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0021] Figure 3 It is the vertical axis chromatic aberration diagram of the full working band of the utility model;

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

[0023] 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

[0024] In order to make the above features and advantages of the present invention more understandable, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0025] refer to Figures 1 to 4

[0026] An ultra-wide-angle high-definition surround camera lens, the optical system of the lens is composed of a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5 and a sixth lens L6 which are arranged in sequence from the object side to the image side along the incident light path of the light, wherein the fourth lens and the fifth lens are 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 meniscus concave negative lens, whose object side surface is The first lens is a convex surface, and the image side surface is a concave surface; the third lens is a double convex positive lens, whose object side surface is convex, and the image side surface is convex; the fourth lens is a double convex positive lens, whose object side surface is convex, and the image side surface is convex; the fifth lens is a double concave negative lens, whose object side surface is concave, and the image side surface is concave; the sixth lens is a double convex positive lens, whose object side surface is convex, and the image side surface is convex; each lens is made of glass material, the second lens and the sixth lens are glass aspherical lenses, and the first lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses.

[0027] In this embodiment, the first lens and the second lens are both lenses with negative optical power. While adjusting the large-angle light, the aspherical lens has the function of reducing the distortion of the optical system. The fourth lens and the fifth lens form an achromatic doublet. Reasonable lens matching enables the optical system to achieve 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.

[0028] In this embodiment, the focal length of the optical system is , the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively , , , , , ,in , , , , , and Meet the following ratio: -6.0< / <-5.0, -2.0< / <-1.0, 2.0< / <3.0, 2.0< / <3.0, -2.0< / <-1.0, 2.0< / <3.0.

[0029] In this embodiment, the first lens satisfies the relationship: 2.0≤ ≤2.5, ≤50.0; the second lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; the third lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the fourth lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; The fifth lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the sixth lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; where is the refractive index, is the Abbe constant.

[0030] In this embodiment, the axial distances between the lenses satisfy the following relationship: the air interval between the first lens and the second lens is 3.0-3.5 mm; the air interval between the second lens and the third lens is 1.5-2.0 mm; the air interval between the third lens and the aperture is 0.1-0.5 mm; the air interval between the aperture and the fourth lens is 0.5-1.0 mm; the fourth lens and the fifth lens are glued sheets, and the air interval is 0 mm; the air interval between the fifth lens and the sixth lens is 0.1-0.5 mm. While meeting the imaging requirements, reducing the distance between the lenses is beneficial to the total optical length of the lens.

[0031] In this embodiment, the aspheric curve equations of the second lens and the sixth lens are expressed as:

[0032]

[0033] 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 h along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; All are high-order coefficients.

[0034] 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≤15.0.

[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 further disposed on the image side of the sixth lens.

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

[0038] (1) Focal length: 1.0 ≤ EFFL ≤ 2.0 mm;

[0039] (2) Aperture F ≤ 2.0;

[0040] (3) Field of view: 2w ≥ 200°;

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

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

[0043] .

[0044] The aspheric coefficients of the aspheric lenses of the optical system of this embodiment are as follows:

[0045] .

[0046] In this embodiment, the optical system satisfies the requirements of small size and 200° ultra-wide-angle imaging while meeting the requirements of lens imaging performance by reasonably allocating the optical focal length, surface shape, center thickness of each lens, and axial distance between each lens.

[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 fixed connection to each other 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).

[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 forming process.

[0050] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An ultra-wide-angle high-definition surround camera lens, It is characterized in that The optical system of the lens 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 the object side to the image side along the incident optical path of the light, wherein the fourth lens and the fifth lens are a cemented lens group; without considering the backcurvature 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 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 biconcave negative lens, whose object side surface is concave and whose image side surface is concave; the sixth lens is a biconvex positive lens, whose object side surface is convex and whose image side surface is convex; each lens is made of glass material, the second lens and the sixth lens are glass aspheric lenses, and the first lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses; the focal length of the optical system is , the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively , , , , , ,in , , , , , and Meet the following ratio: -6.0< / <-5.0, -2.0< / <-1.0, 2.0< / <3.0, 2.0< / <3.0, -2.0< / <-1.0, 2.0< / <3.

0.

2. The ultra-wide-angle high-definition surround-view camera lens according to claim 1, It is characterized in that The first lens satisfies the relationship: 2.0≤ ≤2.5, ≤50.0; the second lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; the third lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the fourth lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; The fifth lens satisfies the relationship: 1.7≤ ≤2.0, ≤50.0; the sixth lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; where is the refractive index, is the Abbe constant.

3. The ultra-wide-angle high-definition surround-view camera lens according to claim 1 or 2, It is 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 3.0-3.5 mm; the air gap between the second lens and the third lens is 1.5-2.0 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 0.5-1.0 mm; the fourth lens and the fifth lens are glued sheets with an air gap of 0 mm; the air gap between the fifth lens and the sixth lens is 0.1-0.5 mm.

4. The ultra-wide-angle high-definition surround-view camera lens according to claim 1, It is characterized in that The total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤15.

0.

5. The ultra-wide-angle high-definition surround-view camera lens according to claim 1, It is characterized in that The F number of the optical system is ≤2.

0.

6. The ultra-wide-angle high-definition surround-view camera lens according to claim 1, It is 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.

7. The ultra-wide-angle high-definition surround-view camera lens according to claim 1 or 2, It is characterized in that A filter is also arranged on the image side of the sixth lens.

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