Vehicle-mounted visual perception lens

Abstract

The application relates to the technical field of lenses, in particular to a vehicle-mounted visual perception lens, which 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 an optical path of light incidence; the fourth lens and the fifth lens form a cemented lens group; wherein the first lens and the second lens are aspherical lenses, and the third lens to the sixth lens are spherical lenses. The lens can realize 4K ultra-high-definition imaging, has a small aperture value, a large field of view and good high-low temperature performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lenses, in particular to a vehicle-mounted visual perception lens. BACKGROUND

[0002] Automatic driving, also known as unmanned driving, is a cutting-edge technology that realizes complete, safe and effective driving without human operation by relying on computer and artificial intelligence technology. The commonly used intelligent sensors mainly include laser radar, millimeter wave radar and vehicle-mounted camera. As a kind of visual sensor with the widest application range, the vehicle-mounted camera will still be the dominant vehicle intelligent sensor. From the earliest reversing image, driving recorder and other applications for recording or expanding the driver's sensory function, the vehicle-mounted lens has been applied to intelligent scenarios such as automatic parking, driver and passenger monitoring system. With the continuous development of technology, the vehicle-mounted lens needs higher resolution and smaller pixel unit to improve the accuracy of image taking and recognition. SUMMARY

[0003] The purpose of the present application is to provide a vehicle-mounted visual perception lens, which realizes 4K ultra-high definition imaging while having a smaller aperture value, a larger field of view, and better high and low temperature performance.

[0004] The technical solution of the present application is as follows: a vehicle-mounted visual perception lens, which 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 path; without considering the reverse curvature caused by the aspherical coefficient, the first lens is a meniscus negative lens, the object side is convex, and the image side is concave; the second lens is a meniscus negative lens, the object side is concave, and the image side is convex; the third lens is a double-convex positive lens; the fourth lens is a double-convex positive lens; the fifth lens is a meniscus negative lens, the object side is concave, and the image side is convex; the sixth lens is a meniscus positive lens, the object side is convex, and the image side is concave; the fourth lens and the fifth lens form a cemented lens group; wherein the first lens and the second lens are aspherical lenses, and the third lens to the sixth lens are spherical lenses.

[0005] Further, the air gap between the first lens and the second lens is 1.85-2.35mm; the air gap between the second lens and the third lens is 0.05-0.2mm; the air gap between the third lens and the fourth lens is 0.5-1.5mm; and the air gap between the fifth lens and the sixth lens is 0.5-1.5mm.

[0006] Further, the focal length of the optical system of the lens is , 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 , respectively. 、 、 、 、 wherein 、 、 、 、 、 and satisfy the following ratios: -2.5 / -1.5, -7.0 / -6.0, 1.0 / <2.0, 0.5 / <1.5, -2.0 / -1.0, 3.0 / <4.0.

[0007] Further, the first lens satisfies the relationship: 1.5 ≤ 1.8, ≤ 50.0; the second lens satisfies the relationship: 1.5 ≤ 1.8, ≤ 50.0; the third lens satisfies the relationship: 1.5 ≤ 1.8, ≥ 50.0; the fourth lens satisfies the relationship: 1.5 ≤ 1.8, ≥ 50.0; the fifth lens satisfies the relationship: ≥ 1.8, ≤ 50.0; the sixth lens satisfies the relationship: 1.5 ≤ 1.8, ≥ 50.0; wherein is the refractive index, is the Abbe number.

[0008] Further, the optical total track length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL / f

[0009] Further, the F number of the optical system of the lens is

[0010] Further, the image height H of the optical system of the lens and the focal length f of the optical system satisfy: H / f

[0011] Further, the refractive index temperature coefficient of the fourth lens, the sixth lens .

[0012] Further, the first lens and the second lens are glass aspheric lenses, and the third lens to the sixth lens are all glass spherical lenses.

[0013] Further, an equivalent glass flat plate is arranged between the sixth lens and the imaging surface.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] The lens for vehicle-mounted visual perception adopts six glass lenses, at least two of which are glass molded aspheric lenses, correcting various aberrations, so that the lens has 4K ultra-high definition imaging quality, and has the advantages of small aperture value, large field of view, good high and low temperature performance, etc. At the same time, the lens has a large aperture and a relative luminance of more than 80%, ensuring that the image surface of the lens has high and uniform luminance; considering the working environment temperature of the lens, the present application adds a lens with a negative refractive index temperature coefficient when selecting the lens material, and also considers the thermal expansion effect of the base, so that the lens has a small defocus amount at a temperature of-40 degrees Celsius to 85 degrees Celsius, and can still perform high-definition imaging. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the optical structure of the present application;

[0017] Figure 2 It is an axial chromatic aberration graph of the full working waveband of the present application;

[0018] Figure 3 It is a vertical chromatic aberration graph of the full working waveband of the present application;

[0019] Figure 4 It is a field curvature distortion graph of the full working waveband of the present application;

[0020] Figure 5 It is a defocus curve graph at a low temperature of-40 degrees Celsius in the visible light waveband of the present application;

[0021] Figure 6 It is a defocus curve graph at a normal temperature of 25 degrees Celsius in the visible light waveband of the present application;

[0022] Figure 7 It is a defocus curve graph at a high temperature of 85 degrees Celsius in the visible light waveband of the present application;

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

[0024] In order to make the above features and advantages of the present application more apparent, the following embodiments are described in detail below, with reference to the accompanying drawings, but the present application is not limited thereto.

[0025] Reference Figures 1 to 7

[0026] A vehicle-mounted visual perception lens, which 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 path; without considering the reverse curvature caused by aspherical coefficients, the first lens is a meniscus negative lens, the object side is convex, and the image side is concave; the second lens is a meniscus negative lens, the object side is concave, and the image side is convex; the third lens is a double-convex positive lens; the fourth lens is a double-convex positive lens; the fifth lens is a meniscus negative lens, the object side is concave, and the image side is convex; the sixth lens is a meniscus positive lens, the object side is convex, and the image side is concave; the fourth lens and the fifth lens constitute a cemented lens group; wherein the first lens and the second lens are glass aspherical lenses, and the third lens to the sixth lens are glass spherical lenses.

[0027] In this embodiment, the air gap between the first lens and the second lens is 1.85-2.35mm; the air gap between the second lens and the third lens is 0.05-0.2mm; the air gap between the third lens and the fourth lens is 0.5-1.5mm; and the air gap between the fifth lens and the sixth lens is 0.5-1.5mm.

[0028] In this embodiment, the focal length of the optical system of the lens is , 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 , , , , , , respectively. , , , , , , satisfy the following ratios: -2.5 / <-1.5, -7.0 / <-6.0, 1.0 / <2.0, 0.5 / <1.5, -2.0 / <-1.0, 3.0 <4.0.

[0029] In the embodiment, the first lens satisfies the relationship: 1.5 ≤ ≤1.8, ≤50.0; the second lens satisfies the relationship: 1.5 ≤ ≤1.8, ≤50.0; the third lens satisfies the relationship: 1.5 ≤ ≤1.8, ≥50.0; the fourth lens satisfies the relationship: 1.5 ≤ ≤1.8, ≥50.0; the fifth lens satisfies the relationship: ≥1.8, ≤50.0; the sixth lens satisfies the relationship: 1.5 ≤ ≤1.8, ≥50.0; wherein is a refractive index, is an Abbe number.

[0030] In the embodiment, the optical total length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL / f ≤ 5.0. The F number of the optical system of the lens is ≤1.6. The image height H of the optical system of the lens and the focal length f of the optical system satisfy: H / f ≥ 1.0.

[0031] In the embodiment, the temperature coefficient of the refractive index of the fourth lens and the sixth lens An equivalent glass flat plate is arranged between the sixth lens and the imaging surface.

[0032] In the embodiment, the aspherical surface curve equation expression of the first lens and the second lens is:

[0033]

[0034] wherein, Z is the sagittal height of the aspherical surface at a height of h along the optical axis direction from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface; k is the conic constant; are high-order coefficients.

[0035] In the embodiment, as shown in Figures 2 to 4 , various aberration problems of the system are effectively optimized by reasonable lens matching, and the imaging quality is improved; as shown in Figures 5 to 7 , the optical lens has a small defocus amount at -40℃ and 85℃, effectively ensuring the imaging quality at high and low temperatures.

[0036] ​In the embodiment, the technical indexes realized by the optical system of the lens are as follows:

[0037] (1) focal length: 4.0≤EFFL≤5.0mm;

[0038] (2) aperture F≤1.6;

[0039] (3) field of view angle: 2w≥100°;

[0040] (4) working waveband: visible light waveband.

[0041] In the embodiment, in order to realize the design parameters, the specific design of the optical system is shown in the following table:

[0042] .

[0043] In the embodiment, the aspheric coefficients of the aspheric lenses of the optical system of the lens are shown in the following table:

[0044] .

[0045] In the embodiment, the optical system realizes small size, large relative aperture and athermalization design, and the on-axis and off-axis aberrations are well corrected, so that the system imaging quality reaches 4K definition.

[0046] The above only describes the preferred embodiments of the present application, and for those skilled in the art, according to the teaching of the present application, it does not need creative labor to design a vehicle-mounted visual perception lens with different forms, and any equivalent change, modification, replacement and transformation made within the scope of the present application should be included in the scope of the present application.

Claims

1. A vehicle-mounted visual perception lens, characterized in that, The lens consists of a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from left to right along the incident light path. Ignoring curvature caused by aspherical coefficients, the first lens is a meniscus negative lens with a convex object-side and a concave image-side; the second lens is a meniscus negative lens with a concave object-side and a convex image-side; the third lens is a biconvex positive lens; the fourth lens is a biconvex positive lens; the fifth lens is a meniscus negative lens with a concave object-side and a convex image-side; and the sixth lens is a meniscus positive lens with a convex object-side and a concave image-side. The fourth and fifth lenses form a cemented lens group. The first and second lenses are aspherical lenses, while the third through sixth lenses are spherical lenses. The lens contains six lenses with optical power. The focal length of the lens's optical system is [missing information]. The focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are respectively , , , , , ,in , , , , , and Meets the following ratio: -2.5 < / <-1.5, -7.0< / <-6.0, 1.0< / <2.0, 0.5< / <1.5, -2.0< / <-1.0, 3.0< / <4.0; The total optical length (TTL) of the lens's optical system and the focal length (f) of the optical system satisfy: TTL / f≤5.0; The F-number of the lens's optical system ≤1.6; The image height (H) of the lens's optical system and the focal length (f) of the optical system satisfy: H / f≥1.

0.

2. The vehicle-mounted visual perception lens according to claim 1, characterized in that, The air gap between the first lens and the second lens is 1.85~2.35mm; the air gap between the second lens and the third lens is 0.05~0.2mm; the air gap between the third lens and the fourth lens is 0.5~1.5mm; and the air gap between the fifth lens and the sixth lens is 0.5~1.5mm.

3. A vehicle-mounted visual perception lens according to claim 1 or 2, characterized in that, The first lens satisfies the following relationship: 1.5 ≤ ≤1.8, ≤50.0; The second lens satisfies the relationship: 1.5≤ ≤1.8, ≤50.0; The third lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; The fourth lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; the fifth lens satisfies the following relationship: ≥1.8, ≤50.0; The sixth lens satisfies the relationship: 1.5≤ ≤1.8, ≥50.0; of which For refractive index, Let be Abbe's constant.

4. The vehicle-mounted visual perception lens according to claim 1, characterized in that, The refractive index temperature coefficients dn / dt of the fourth and sixth lenses are less than 0.

5. A vehicle-mounted visual perception lens according to claim 1, 2, or 4, characterized in that, The first and second lenses are aspherical glass lenses, while the third to sixth lenses are all spherical glass lenses.

6. A vehicle-mounted visual perception lens according to claim 1, 2, or 4, characterized in that, An equivalent glass plate is placed between the sixth lens and the imaging plane.

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