An ultra-high-definition vehicle-mounted long-focus lens

Abstract

The application relates to a super-high-definition vehicle-mounted long-focus lens which 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 arranged in sequence from left to right along a light incidence path; without considering the reverse bending caused by the aspherical surface coefficient, the first lens is a meniscus positive lens, the object side is a convex surface, and the image side is a concave surface; the second lens is a meniscus positive lens, the object side is a convex surface, and the image side is a concave surface; the third lens is a meniscus negative lens, the object side is a convex surface, and the image side is a concave surface; the fourth lens is a double-concave negative lens; the fifth lens is a double-convex positive lens; the sixth lens is a double-convex positive lens; and the seventh lens is a double-concave negative lens; wherein the second lens and the third lens form a cemented lens group, the fourth lens and the fifth lens form a cemented lens group, and the seventh lens is an aspherical lens. The lens meets the optical performance requirements of high resolution, long focal length, large aperture and large target surface, and the total length of the lens is smaller.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lenses, in particular to an ultra-high-definition vehicle-mounted long-focus lens. BACKGROUND

[0002] With the increasing of the intelligent degree of the automobile, the camera begins to combine with the algorithm, and the 5G and the ADAS (advanced driving assistance system) are rapidly popularized, the automobile is continuously increasing the intelligent development pace, and the perception technology of the automobile as a core of the development of the automatic driving technology makes the camera lens an indispensable sensor for the intelligent driving automobile.

[0003] The focal length of the lens determines the size of the field of view of the photographed image, and the longer the focal length of the lens, the smaller the angle of view. In order to image the objects at a long distance, such as traffic lights and the like, a long-focus lens needs to be used, however, a long focal length will result in an increase in the number of lenses, a longer total length, a smaller relative aperture and the like. SUMMARY

[0004] The purpose of the present application is to provide an ultra-high-definition vehicle-mounted long-focus lens, which meets the optical performance of high resolution, long focal length and the like, and at the same time meets the requirements of large aperture and large target surface, and the total length of the lens is also smaller.

[0005] The technical scheme of the present application is that an ultra-high-definition vehicle-mounted long-focus lens 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 arranged in order from left to right along the light incident path; without considering the reverse bending caused by the aspherical surface coefficient, the first lens is a meniscus positive lens, the object side is convex, and the image side is concave; the second lens is a meniscus positive lens, the object side is convex, and the image side is concave; the third lens is a meniscus negative lens, the object side is convex, and the image side is concave; the fourth lens is a double-concave negative lens; the fifth lens is a double-convex positive lens; the sixth lens is a double-convex positive lens; the seventh lens is a double-concave negative lens; wherein the second lens and the third lens form a cemented lens group, the fourth lens and the fifth lens form a cemented lens group; the seventh lens is an aspherical lens.

[0006] Further, the air gap between the first lens and the second lens is 0.1-0.2mm; the air gap between the third lens and the fourth lens is 4.65-5.0mm; the air gap between the fifth lens and the sixth lens is 0.05-0.15mm; and the air gap between the sixth lens and the seventh lens is 0.2-0.6mm.

[0007] 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, the sixth lens and the seventh lens are , , respectively. 、 、 、 、 wherein 、 、 、 、 、 、 and satisfy the following ratios: 1.0 / <2.0, 0.5 / <1.5, -1.0 / <0, -1.0 / <0, 0 / <1.0, 0 / <1.0, -1.0 / <0.

[0008] Further, the first lens satisfies the relationship: ≥ 1.8, ≤ 50.0; the second lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the third lens satisfies the relationship: ≥ 1.5, ≤ 50.0; the fourth lens satisfies the relationship: ≥ 1.5, ≤ 50.0; the fifth lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the sixth lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the seventh lens satisfies the relationship: ≥ 1.5, ≤ 50.0; wherein is the refractive index, is the Abbe number.

[0009] 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≤2.0.

[0010] Further, the F number of the optical system of the lens is ≤1.6.

[0011] Further, the optical system of the lens satisfies H / f≥0.5 between a high H and a focal length f of the optical system.

[0012] Further, the first lens to the seventh lens are all made of glass material, wherein the seventh lens is a glass aspherical lens, and the first lens to the sixth lens are all glass spherical lenses.

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

[0014] Compared with the prior art, the present application has the following advantages: the ultra-high-definition vehicle-mounted long-focus lens adopts one aspherical glass lens and six spherical glass lenses, compared with the traditional spherical lenses, the lens realizes high resolution, and the defocus curve is more concentrated, has better image surface stability, and is convenient for module installation; meanwhile, the total length of the optical lens is less than 25mm, the size is smaller, and the cost is lower; the lens F number is 1.6, and has a larger light aperture; the lens can adapt to a 1 / 1.8 inch size chip, the relative luminance of the edge field of view can reach more than 70%, the shot frame is larger, and the details are clearer. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the optical structure of the present application;

[0016] Figure 2 is a full working waveband axial chromatic aberration diagram of the present application;

[0017] Figure 3 is a full working waveband transverse chromatic aberration diagram of the present application;

[0018] Figure 4 is a full working waveband field curvature distortion diagram of the present application;

[0019] Figure 5 is a defocus curve diagram under visible light of the present application;

[0020] Figure 6 is a relative luminance diagram of the present application;

[0021] In the figure: L1-first lens; L2-second lens; L3-third lens; STO-diaphragm; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-equivalent glass flat plate; IMA-imaging surface. DETAILED DESCRIPTION

[0022] In order to make the above features and advantages of the present application more apparent and easy to understand, the following specific examples are given, and the detailed description is given below with reference to the accompanying drawings, but the present application is not limited thereto.

[0023] REFERENCE Figures 1 to 6

[0024] An ultra-high-definition vehicle-mounted long-focus lens, which is composed of a first lens L1, a second lens L2, a third lens L3, a diaphragm STO, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged in sequence from left to right along the light path of light incidence; without considering the reverse bending caused by the aspherical coefficient, the first lens is a meniscus positive lens, the object side is convex, and the image side is concave; the second lens is a meniscus positive lens, the object side is convex, and the image side is concave; the third lens is a meniscus negative lens, the object side is convex, and the image side is concave; the fourth lens is a double-concave negative lens; the fifth lens is a double-convex positive lens; the sixth lens is a double-convex positive lens; the seventh lens is a double-concave negative lens; wherein the second lens and the third lens form a cemented lens group, and the fourth lens and the fifth lens form a cemented lens group; the first lens to the seventh lens are all made of glass material, wherein the seventh lens is a glass aspherical lens, and the first lens to the sixth lens are all glass spherical lenses.

[0025] In the embodiment, the air gap between the first lens and the second lens is 0.1-0.2 mm; the air gap between the third lens and the fourth lens is 4.65-5.0 mm; the air gap between the fifth lens and the sixth lens is 0.05-0.15 mm; and the air gap between the sixth lens and the seventh lens is 0.2-0.6 mm.

[0026] In the 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, the sixth lens and the seventh lens are respectively , , , , , , , , , , , , , and satisfy the following ratios: 1.0 / <2.0, 0.5 / <1.5, -1.0 / <0, -1.0 / <0, 0 / <1.0, 0 / <1.0, -1.0 <0.

[0027] In this embodiment, the first lens satisfies the relationship: ≥ 1.8, ≤ 50.0; the second lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the third lens satisfies the relationship: ≥ 1.5, ≤ 50.0; the fourth lens satisfies the relationship: ≥ 1.5, ≤ 50.0; the fifth lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the sixth lens satisfies the relationship: ≥ 1.5, ≥ 50.0; the seventh lens satisfies the relationship: ≥ 1.5, ≤ 50.0; wherein is the refractive index, is the Abbe number.

[0028] In this embodiment, the aspherical curve equation expression of the seventh lens is:

[0029]

[0030] wherein Z is the sagittal height of the aspherical surface at a height h along the optical axis 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.

[0031] In this embodiment, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL / f≤2.0. The F number of the optical system is ≤1.6. The image height H of the lens and the focal length f of the optical system satisfy: H / f≥0.5.

[0032] In this embodiment, an equivalent glass flat plate is further arranged between the seventh lens and the imaging surface.

[0033] In this embodiment, the technical index that can be achieved by the optical system of the lens is as follows:

[0034] (1) focal length: 15.0≤EFFL≤16.0mm;

[0035] (2) aperture F≤1.6;

[0036] (3) field of view angle: 2w≥30°;

[0037] ​(4) Working waveband: visible light waveband.

[0038] In this embodiment, in order to realize the above design parameters, the specific design of the optical system is shown in the following table:

[0039] .

[0040] The aspheric coefficients of each aspheric lens of the optical system of this embodiment are shown in the following table:

[0041] .

[0042] The lens has the advantages of high image quality, large light aperture, large target surface, small size and the like by reasonably utilizing the characteristics of the aspheric surface and optimizing the parameters of each lens.

[0043] 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 different form of the super-high-definition vehicle-mounted long-focus lens, 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. An ultra-high definition vehicle-mounted long-focus lens, characterized in that, The lens 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 arranged in sequence from left to right along the light incident path; without considering the reverse bending caused by the aspherical coefficient, the first lens is a meniscus positive lens, the object side is convex, and the image side is concave; the second lens is a meniscus positive lens, the object side is convex, and the image side is concave; the third lens is a meniscus negative lens, the object side is convex, and the image side is concave; the fourth lens is a double-concave negative lens; the fifth lens is a double-convex positive lens; the sixth lens is a double-convex positive lens; the seventh lens is a double-concave negative lens; wherein the second lens and the third lens form a cemented lens group, and the fourth lens and the fifth lens form a cemented lens group; the seventh lens is an aspherical lens; the number of lenses with optical power in the lens is 7; the optical system focal length of the lens is , 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 respectively 、 、 、 、 、 、 , wherein 、 、 、 、 、 、 and satisfy the following ratios: 1.0 / <2.0, 0.5 / <1.5, -1.0 / <0, -1.0 / <0, 0 / <1.0, 0 / <1.0, -1.0 / <0; the optical system total length TTL of the lens and the focal length f of the optical system satisfy: TTL / f≤2.0; 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≥0.

5.

2. The ultra-high definition vehicle-mounted long-focus lens according to claim 1, characterized in that, The air interval between the first lens and the second lens is 0.1-0.2 mm; the air interval between the third lens and the fourth lens is 4.65-5.0 mm; the air interval between the fifth lens and the sixth lens is 0.05-0.15 mm; and the air interval between the sixth lens and the seventh lens is 0.2-0.6 mm.

3. The ultra-high definition vehicle-mounted long-focus lens according to claim 1, characterized in that, the first lens satisfies the relation: ≥ 1.8, ≤ 50.0; the second lens satisfies the relation: ≥ 1.5, ≥ 50.0; the third lens satisfies the relation: ≥ 1.5, ≤ 50.0; the fourth lens satisfies the relation: ≥ 1.5, ≤ 50.0; the fifth lens satisfies the relation: ≥ 1.5, ≥ 50.0; the sixth lens satisfies the relation: ≥ 1.5, ≥ 50.0; the seventh lens satisfies the relation: ≥ 1.5, ≤ 50.0; wherein is the refractive index, is the Abbe number.

4. The ultra-high definition vehicle-mounted long-focus lens according to claim 1, characterized in that, The first lens to the seventh lens are all made of glass material, wherein the seventh lens is a glass aspheric lens, and the first lens to the sixth lens are all glass spherical lenses.

5. The ultra-high definition vehicle-mounted long-focus lens according to claim 1, characterized in that, An equivalent glass flat plate is arranged between the seventh lens and the imaging surface.

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