CN112014960A - High-resolution large-visual-angle vehicle-mounted fisheye optical lens and vehicle-mounted all-around-view lens - Google Patents

Abstract

The invention discloses a high-resolution large-visual-angle vehicle-mounted fisheye optical lens which is characterized in that a first negative meniscus lens, a second negative meniscus lens, a third double convex positive lens, a fourth double convex positive lens, a fifth double concave negative lens, a sixth double convex positive lens, protective glass and an image plane IMA are sequentially arranged along an optical axis from left to right incident direction. The high-resolution large-visual-angle vehicle-mounted fisheye optical lens provided by the invention is composed of 2 glass spherical lenses and 4 plastic aspheric lenses, has a simple structure, a small volume and low cost, can realize clear imaging in a range of-40 degrees to 85 degrees, has small temperature drift, meets the imaging requirement of 200 ten thousand pixels, has a larger visual angle and an imaging element than the optical lens in the prior art, has a maximum visual angle DFOV of 210 degrees, a maximum imaging element of 6mm, has higher resolving power, and can be matched with a larger sensor.

Description

A high-resolution large-view vehicle fisheye optical lens and a surround-view vehicle lens

technical field

The invention belongs to the technical field of optical lenses, and in particular relates to a high-resolution, large-viewing angle vehicle-mounted fisheye optical lens and a surround-view vehicle-mounted lens.

Background technique

In recent years, with the development of in-vehicle technology, the technical requirements of the front-view camera device, the surround-view camera device, and the automatic cruise device for the in-vehicle camera are getting higher and higher. Among them, the surround-view vehicle lens is an important part of the advanced driver assistance system. The driver can intuitively see the obstacles around the car through the surround-view vehicle lens to avoid driving accidents. However, the image captured by the traditional surround-view camera lens has low resolution, large volume and high cost. At present, the imaging element of the fisheye lens on the market is generally less than 6mm, which cannot achieve high-definition imaging at the same time as shooting in a wide angle range, and cannot make driving assistance systems possible. Real-time and accurate judgment of the environmental information around the vehicle to make timely warning or avoidance, there is a driving risk. .

SUMMARY OF THE INVENTION

In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a high-resolution large viewing angle vehicle-mounted fisheye optical lens and a surround-view vehicle-mounted lens, which are suitable for the field of automobile systems and automatic driving.

In order to achieve the above-mentioned purpose and achieve the above-mentioned technical effect, the technical scheme adopted in the present invention is:

A high-resolution, large-viewing angle vehicle-mounted fisheye optical lens, wherein a first negative meniscus lens, a second negative meniscus lens, a third positive biconvex lens, and a fourth curved biconvex lens are sequentially arranged along the optical axis from left to right in the incident direction Positive lens, fifth biconcave negative lens, sixth biconvex positive lens, protective glass and image plane IMA;

The first meniscus negative lens has negative refractive power, and the image side surface is concave;

The second negative meniscus lens has negative refractive power, the object side is convex, and the image side is concave;

The third biconvex positive lens has positive refractive power, the object side is convex or concave, and the image side is convex;

The fourth curved biconvex positive lens has positive refractive power, the object side is convex, and the image side is convex or concave;

The fifth double-concave negative lens has negative refractive power, the object side is concave, and the image side is concave;

The sixth biconvex positive lens has positive refractive power, the object side is convex, and the image side is convex;

At the same time, the following conditions are met:

-6≤f1/f≤-4.3, -3.2≤f2/f≤-1.2, 1.7≤f3/f≤3.7, 0.8≤f4/f≤2.8, -2.1≤f5/f≤-0.1, 1.1≤f6/ f≤3.1;

Among them, f1, f2, f3, f4, f5, f6 are the first negative meniscus lens, the second negative meniscus lens, the third positive biconvex lens, the fourth curved biconvex positive lens, and the fifth biconcave negative lens. , the focal length of the sixth biconvex positive lens; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

Further, the first meniscus negative lens and the third biconvex positive lens are glass spherical lenses, the second meniscus negative lens, the fourth curved biconvex positive lens, the fifth biconcave negative lens and the sixth biconvex positive lens. The lens is a plastic aspheric lens.

Further, the difference between Abbe numbers of at least two adjacent lenses is 20-25, excluding 20 and 25.

Further, the fourth curved biconvex positive lens and the fifth biconcave negative lens are optically cemented cemented lenses or separate lenses.

Further, the vehicle-mounted fisheye optical lens satisfies the following conditions:

BFL/TTL≤0.3

Wherein, BFL is the distance on the optical axis from the center of the image side of the sixth biconvex positive lens of the vehicle-mounted fisheye optical lens to the image plane IMA of the vehicle-mounted fisheye optical lens; TTL is the distance on the object side of the first meniscus negative lens The distance from the center to the image plane IMA on the optical axis.

Further, the vehicle-mounted fisheye optical lens satisfies the following conditions:

FOV/h/D≤5

Among them, FOV is the maximum field of view of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens; D is the first meniscus corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens The maximum clear aperture of the object side of the negative lens.

Further, the vehicle-mounted fisheye optical lens satisfies the following conditions:

(FOV×f)/h≥35

Among them, FOV is the maximum field of view of the vehicle-mounted fisheye optical lens; f is the focal length value of the entire group of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens.

Further, the vehicle-mounted fisheye optical lens satisfies the following conditions:

TTL/f≤20

Wherein, TTL is the distance from the center of the object side of the first negative meniscus lens to the image plane IMA on the optical axis; f is the focal length value of the entire group of the vehicle-mounted fisheye optical lens.

Further, the aspheric surface types of the second meniscus negative lens, the fourth curved biconvex positive lens, the fifth biconvex negative lens and the sixth biconvex positive lens are described as follows:

Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c=1/r, r is the curvature radius of the aspheric mirror surface; k is the conic coefficient conic; A, B, C, D, E, F, and G are the coefficients of aspheric high-order terms.

The present invention provides a surround-view vehicle-mounted lens, including a high-resolution and large-view vehicle-mounted fisheye optical lens.

Compared with the prior art, the beneficial effects of the present invention are:

The invention discloses a high-resolution and large-viewing angle vehicle-mounted fisheye optical lens. A first negative meniscus lens, a second negative meniscus lens, a third biconvex positive lens, and a third negative meniscus lens are sequentially arranged along the optical axis from left to right in the incident direction. Four-bent biconvex positive lens, fifth biconvex negative lens, sixth biconvex positive lens, protective glass and image surface IMA; the first meniscus negative lens has negative refractive power and the image side is concave; the second meniscus negative lens The lens has negative refractive power, its object side is convex, and its image side is concave; the third biconvex positive lens has positive power, its object side is convex or concave, and its image side is convex; the fourth curved biconvex positive lens has Positive refractive power, the object side is convex, and the image side is convex or concave; the fifth biconvex negative lens has negative refractive power, and its object side is concave, and the image side is concave; the sixth biconvex positive lens has positive refractive power , the object side is convex, and the image side is convex. The high-resolution and large-viewing angle vehicle-mounted fisheye optical lens provided by the present invention is composed of two glass spherical lenses and four plastic aspherical lenses, and has a simple structure, small volume and low cost, and can be realized in the range of -40° to 85°. Clear imaging, small temperature drift, meeting the imaging requirements of 2 million pixels, with a larger field of view and imaging element than the existing optical lens, the maximum field of view angle DFOV can reach 210°, the maximum imaging element can reach 6mm, and the resolution power Higher to meet the 2-megapixel imaging requirements and can match larger sensors.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the MTF curve diagram of the present invention;

FIG. 3 is a defocus curve diagram of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

As shown in Figure 1-3, a high-resolution and large-view vehicle fisheye optical lens is provided with a first negative meniscus lens 1, a second negative meniscus lens 2, and a third negative meniscus lens along the optical axis from left to right in the incident direction. Biconvex positive lens 3, fourth curved biconvex positive lens 4, fifth biconvex negative lens 5, sixth biconvex positive lens 6, protective glass 7 and image plane IMA 8; diaphragm 9 is located in the third biconvex positive lens 3 and the fourth curved biconvex positive lens 4;

The first meniscus negative lens 1 has negative refractive power, and the image side surface is concave;

The second meniscus negative lens 2 has a negative refractive power, and its object side is convex, and its image side is concave;

The third biconvex positive lens 3 has a positive refractive power, its object side is convex or concave, and its image side is convex;

The fourth curved biconvex positive lens 4 has positive refractive power, and its object side is convex, and its image side is convex or concave;

The fifth double concave negative lens 5 has negative refractive power, and its object side is concave, and its image side is concave;

The sixth biconvex positive lens 6 has positive refractive power, and its object side is convex, and its image side is convex;

At the same time, the following conditions are met:

-6≤f1/f≤-4.3, -3.2≤f2/f≤-1.2, 1.7≤f3/f≤3.7, 0.8≤f4/f≤2.8, -2.1≤f5/f≤-0.1, 1.1≤f6/ f≤3.1;

Among them, f1, f2, f3, f4, f5, f6 are the first negative meniscus lens 1, the second negative meniscus lens 2, the third positive biconvex lens 3, the fourth curved biconvex positive lens 4, and the fifth The focal length of the double concave negative lens 5 and the sixth double convex positive lens 6; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

The first meniscus negative lens 1 and the third biconvex positive lens 3 are glass spherical lenses, the second meniscus negative lens 2, the fourth curved biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens The lens 6 is a plastic aspherical lens.

In the high-resolution large viewing angle vehicle fisheye optical lens, the difference between the Abbe numbers of at least two adjacent lenses is 20-25, excluding 20 and 25.

The fourth curved biconvex positive lens 4 and the fifth biconcave negative lens 5 are optically cemented cemented lenses or separate lenses.

The vehicle-mounted fisheye optical lens meets the following conditions:

BFL/TTL≤0.3

Wherein, BFL is the distance on the optical axis from the center of the last lens (the sixth biconvex positive lens 6) of the vehicle-mounted fisheye optical lens to the imaging plane (image plane IMA 8) of the vehicle-mounted fisheye optical lens; TTL is the distance from the center of the object side of the first negative meniscus lens 1 to the image plane IMA 8 on the optical axis.

The vehicle-mounted fisheye optical lens meets the following conditions:

FOV/h/D≤5

Among them, FOV is the maximum field of view of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens; D is the first meniscus corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens The maximum clear aperture on the object side of the negative lens 1.

The vehicle-mounted fisheye optical lens meets the following conditions:

(FOV×f)/h≥35

Among them, FOV is the maximum field of view of the vehicle-mounted fisheye optical lens; f is the focal length value of the entire group of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens.

The vehicle-mounted fisheye optical lens meets the following conditions:

TTL/f≤20

Wherein, TTL is the distance on the optical axis from the center of the object side surface of the first negative meniscus lens 1 to the imaging plane (image plane IMA8) of the vehicle-mounted fisheye optical lens.

The present invention also provides a surround-view vehicle-mounted lens, including a high-resolution and large-view vehicle-mounted fisheye optical lens.

Example 1

As shown in Figure 1-3, a high-resolution and large-view vehicle fisheye optical lens is provided with a first negative meniscus lens 1, a second negative meniscus lens 2, and a third negative meniscus lens along the optical axis from left to right in the incident direction. Biconvex positive lens 3, fourth curved biconvex positive lens 4, fifth biconvex negative lens 5, sixth biconvex positive lens 6, protective glass 7 and image plane IMA 8; diaphragm 9 is located in the third biconvex positive lens 3 and the fourth curved biconvex positive lens 4;

The first meniscus negative lens 1 has negative refractive power, and the image side surface is concave;

The second meniscus negative lens 2 has a negative refractive power, and its object side is convex, and its image side is concave;

The third biconvex positive lens 3 has a positive refractive power, its object side is convex or concave, and its image side is convex;

The fourth curved biconvex positive lens 4 has positive refractive power, and its object side is convex, and its image side is convex or concave;

The fifth double concave negative lens 5 has negative refractive power, and its object side is concave, and its image side is concave;

The sixth biconvex positive lens 6 has positive refractive power, and its object side is convex, and its image side is convex;

At the same time, the following conditions are met:

-6≤f1/f≤-4.3, -3.2≤f2/f≤-1.2, 1.7≤f3/f≤3.7, 0.8≤f4/f≤2.8, -2.1≤f5/f≤-0.1, 1.1≤f6/ f≤3.1;

Among them, f1, f2, f3, f4, f5, f6 are the first negative meniscus lens 1, the second negative meniscus lens 2, the third positive biconvex lens 3, the fourth curved biconvex positive lens 4, and the fifth The focal length of the double concave negative lens 5 and the sixth double convex positive lens 6; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

The first meniscus negative lens 1 and the third biconvex positive lens 3 are glass spherical lenses, the second meniscus negative lens 2, the fourth curved biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens The lens 6 is a plastic aspherical lens.

First meniscus negative lens 1, second meniscus negative lens 2, third biconvex positive lens 3, fourth curved biconvex positive lens 4, fifth biconvex negative lens 5, sixth biconvex positive lens 6, protection The optical parameters of glass 7 and image plane IMA 8 are shown in Table 1:

Table 1

In Table 1, when the curvature radii of the surfaces of the diaphragm 9 and the cover glass 7 are infinite values, it means that the surfaces are flat.

The high-resolution and large-angle vehicle-mounted fisheye optical lens meets the following conditions, as shown in Table 2:

Table 2

project TTL/f FOV×f/h FOV/h/D BFL/TTL scope ≤20 ≥35 ≤5 ≤0.3

Among them, TTL is the distance from the center of the object side of the first meniscus negative lens 1 to the image plane IMA 8 on the optical axis; FOV is the maximum field of view of the vehicle-mounted fisheye optical lens; f is the entire field of view of the vehicle-mounted fisheye optical lens. Group focal length value; h is the image height corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens; D is the maximum clear aperture of the object side of the first meniscus negative lens 1 corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens ; BFL is the distance on the optical axis from the center of the image side of the last lens (the sixth biconvex positive lens 6) of the vehicle-mounted fisheye optical lens to the imaging plane (image plane IMA 8) of the vehicle-mounted fisheye optical lens.

The second meniscus negative lens 2, the fourth curved biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens 6 are described as follows:

Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c=1/r, r is the radius of curvature of the aspheric mirror surface; k is the conic coefficient conic, A, B, C, D, E, F, and G are the coefficients of aspheric high-order terms, and the specific parameters are shown in Table 3.

table 3

It can be seen from Figure 2 that the MTF curve at 120lp/mm has high imaging quality in the center and the periphery. From Figure 3, it can be seen that the defocus curve is more concentrated and has good processability.

The modules that are not specifically described in the present invention may use existing products, and will not be repeated here.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. A high-resolution large-visual-angle vehicle-mounted fisheye optical lens is characterized in that a first negative meniscus lens, a second negative meniscus lens, a third double convex positive lens, a fourth double convex positive lens, a fifth double concave negative lens, a sixth double convex positive lens, protective glass and an image plane IMA are sequentially arranged along an optical axis from left to right incident direction; the diaphragm is positioned between the third biconvex positive lens and the fourth curved biconvex positive lens;

the first negative meniscus lens has negative focal power, and the image side surface is a concave surface;

the second negative meniscus lens has negative focal power, the object side surface of the second negative meniscus lens is a convex surface, and the image side surface of the second negative meniscus lens is a concave surface;

the third biconvex positive lens has positive focal power, the object side surface of the third biconvex positive lens is a convex surface or a concave surface, and the image side surface of the third biconvex positive lens is a convex surface;

the fourth curved double-convex positive lens has positive focal power, the object side surface of the fourth curved double-convex positive lens is a convex surface, and the image side surface of the fourth curved double-convex positive lens is a convex surface or a concave surface;

the fifth biconcave negative lens has negative focal power, the object side surface of the fifth biconcave negative lens is a concave surface, and the image side surface of the fifth biconcave negative lens is a concave surface;

the sixth biconvex positive lens has positive focal power, and the object side surface of the sixth biconvex positive lens is a convex surface;

meanwhile, the following conditions are satisfied:

-6≤f1/f≤-4.3，-3.2≤f2/f≤-1.2，1.7≤f3/f≤3.7，0.8≤f4/f≤2.8，-2.1≤f5/f≤-0.1，1.1≤f6/f≤3.1；

f1, f2, f3, f4, f5 and f6 are focal lengths of the first negative meniscus lens, the second negative meniscus lens, the third double-convex positive lens, the fourth curved double-convex positive lens, the fifth double-concave negative lens and the sixth double-convex positive lens in sequence; f is the whole group of focal length of the vehicle-mounted fisheye optical lens.

2. The vehicle-mounted high-resolution large-visual-angle fisheye optical lens as claimed in claim 1, wherein the first negative meniscus lens and the third double-convex positive lens are glass spherical lenses, and the second negative meniscus lens, the fourth double-convex positive meniscus lens, the fifth double-concave negative lens and the sixth double-convex positive meniscus lens are plastic aspheric lenses.

3. The vehicle-mounted fisheye optical lens with high resolution and large visual angle as claimed in claim 1, wherein the difference of the abbe numbers of at least two adjacent lenses is 20-25, excluding 20 and 25.

4. The vehicle-mounted fisheye optical lens with high resolution and large visual angle as claimed in claim 1, wherein the fourth curved biconvex positive lens and the fifth biconcave negative lens are cemented lenses or split lenses.

5. The vehicle-mounted high-resolution large-visual-angle fisheye optical lens according to claim 1, characterized in that the vehicle-mounted fisheye optical lens satisfies the following conditions:

BFL/TTL≤0.3

the BFL is the distance from the center of the image side surface of the sixth biconvex positive lens of the vehicle-mounted fisheye optical lens to the image plane IMA of the vehicle-mounted fisheye optical lens on the optical axis; TTL is the distance between the center of the object side surface of the first negative meniscus lens and the image plane IMA on the optical axis.

6. The vehicle-mounted high-resolution large-visual-angle fisheye optical lens according to claim 1, characterized in that the vehicle-mounted fisheye optical lens satisfies the following conditions:

FOV/h/D≤5

the FOV is the maximum field angle of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted fisheye optical lens; and D is the maximum clear aperture of the object side surface of the first meniscus negative lens corresponding to the maximum field angle of the vehicle-mounted fisheye optical lens.

7. The vehicle-mounted high-resolution large-visual-angle fisheye optical lens according to claim 1, characterized in that the vehicle-mounted fisheye optical lens satisfies the following conditions:

(FOV×f)/h≥35

the FOV is the maximum field angle of the vehicle-mounted fisheye optical lens; f is the whole group of focal length values of the vehicle-mounted fisheye optical lens; h is the image height corresponding to the maximum field angle of the vehicle-mounted fisheye optical lens.

8. The vehicle-mounted high-resolution large-visual-angle fisheye optical lens according to claim 1, characterized in that the vehicle-mounted fisheye optical lens satisfies the following conditions:

TTL/f≤20

wherein, TTL is the distance between the center of the object side surface of the first negative meniscus lens and the image plane IMA on the optical axis; f is the whole group of focal length values of the vehicle-mounted fisheye optical lens.

9. The high-resolution large-visual-angle vehicular fisheye optical lens of claim 1, wherein the aspheric surface profiles of the second negative meniscus lens, the fourth convex biconvex positive lens, the fifth biconcave negative lens and the sixth convex biconvex positive lens are described as follows:

z is the distance rise from the aspheric surface vertex at the position with the height h along the optical axis direction; c is 1/r, and r represents the curvature radius of the aspheric mirror surface; k is the conic coefficient conc; A. b, C, D, E, F, G is the coefficient of the aspheric high-order term.

10. A vehicle-mounted lens for looking around, comprising the vehicle-mounted fisheye optical lens with high resolution and large visual angle as claimed in any one of claims 1 to 9.

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