A high-resolution, wide-angle vehicle-mounted fisheye optical lens and a surround-view vehicle-mounted lens

Abstract

The present invention discloses a high-resolution, wide-angle vehicle-mounted fisheye optical lens, wherein a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth biconvex positive lens, a fifth biconcave negative lens, a sixth biconvex positive lens, a protective glass and an image plane IMA are sequentially arranged along the incident direction from left to right along the optical axis. The high-resolution, wide-angle vehicle-mounted fisheye optical lens provided by the present invention is composed of two glass spherical lenses and four plastic aspherical lenses, has a simple structure, a small volume, and a low cost, can achieve clear imaging within the range of ‑40° to 85°, has a small temperature drift, meets the imaging requirements of 2 million pixels, has a larger field of view angle and imaging element than the optical lens of the prior art, the maximum field of view angle DFOV can reach 210°, the maximum imaging element can reach 6mm, has a higher resolution, and can match a larger sensor.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a high-resolution and wide-viewing-angle vehicle-mounted fisheye optical lens and a surround-view vehicle-mounted lens. Background Art

[0002] In recent years, with the development of vehicle-mounted technology, the technical requirements for vehicle-mounted cameras for front-view cameras, surround-view cameras, and automatic cruise control are getting higher and higher. Among them, the surround-view vehicle-mounted lens is an important part of the advanced driver assistance system. The driver can use the surround-view vehicle-mounted lens to intuitively see the obstacles around the car and avoid driving accidents. However, the image resolution captured by traditional surround-view camera lenses is low, the volume is large, and the cost is high. At present, the imaging element of fisheye lenses on the market is generally less than 6mm, which cannot achieve high-definition imaging and wide-angle shooting. The driving assistance system cannot make real-time and accurate judgments on the environmental information around the vehicle and make timely warnings or avoidances, which poses driving risks. . Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a high-resolution and wide-angle vehicle-mounted fisheye optical lens and a surround-view vehicle-mounted lens, which are suitable for automobile systems and the field of autonomous driving.

[0004] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0005] A high-resolution and wide-angle vehicle-mounted fisheye optical lens, wherein a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth biconvex positive lens, a fifth biconcave negative lens, a sixth biconvex positive lens, a protective glass and an image plane IMA are sequentially arranged along the optical axis from left to right in the incident direction;

[0006] The first meniscus negative lens has negative optical power, and the image side surface is concave;

[0007] The second negative meniscus lens has negative optical power, and its object side surface is convex and its image side surface is concave;

[0008] The third biconvex positive lens has positive power, its object side surface is convex or concave, and its image side surface is convex;

[0009] The fourth curved biconvex positive lens has positive power, its object side surface is convex, and its image side surface is convex or concave;

[0010] The fifth biconcave negative lens has negative optical power, and its object side surface is concave, and its image side surface is concave;

[0011] The sixth biconvex positive lens has positive power, and its object side surface is convex, and its image side surface is convex;

[0012] At the same time, the following conditions must be met:

[0013] -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;

[0014] Among them, f1, f2, f3, f4, f5, and f6 are respectively the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the third biconvex positive lens, the fourth biconvex positive lens, the fifth biconcave negative lens, and the sixth biconvex positive lens; and f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

[0015] Furthermore, the first meniscus negative lens and the third biconvex positive lens are glass spherical lenses, and the second meniscus negative lens, the fourth biconvex positive lens, the fifth biconcave negative lens and the sixth biconvex positive lens are plastic aspherical lenses.

[0016] Furthermore, a difference in Abbe numbers between at least two adjacent lenses is 20-25, excluding 20 and 25.

[0017] Furthermore, the fourth curved biconvex positive lens and the fifth biconcave negative lens are optically cemented cemented lenses or separate lenses.

[0018] Furthermore, the vehicle-mounted fisheye optical lens meets the following conditions:

[0019] BFL / TTL≤0.3

[0020] Among them, 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 from the center of the object side surface of the first meniscus negative lens to the image plane IMA on the optical axis.

[0021] Furthermore, the vehicle-mounted fisheye optical lens meets the following conditions:

[0022] FOV / h / D≤5

[0023] 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 maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens.

[0024] Furthermore, the vehicle-mounted fisheye optical lens meets the following conditions:

[0025] (FOV×f) / h≥35

[0026] Among them, FOV is the maximum field of view angle 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 angle of the vehicle-mounted fisheye optical lens.

[0027] Furthermore, the vehicle-mounted fisheye optical lens meets the following conditions:

[0028] TTL / f≤20

[0029] Wherein, TTL is the distance from the center of the object side surface of the first meniscus negative lens to the image plane IMA on the optical axis; f is the focal length value of the entire group of the on-board fisheye optical lens.

[0030] Furthermore, the aspheric surface shapes of the second meniscus negative lens, the fourth biconvex positive lens, the fifth biconcave negative lens and the sixth biconvex positive lens are described as follows:

[0031]

[0032] Among them, Z is the distance vector height from the aspherical surface to the vertex of the aspherical surface at a height of h along the optical axis; c = 1 / r, r represents the radius of curvature of the aspherical mirror surface; k is the cone coefficient conic; A, B, C, D, E, F, G are the coefficients of the high-order terms of the aspherical surface.

[0033] The invention provides a surround-view vehicle-mounted lens, comprising a high-resolution and large-viewing-angle vehicle-mounted fisheye optical lens.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The invention discloses a high-resolution and large-angle vehicle-mounted fisheye optical lens. A first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth biconvex positive lens, a fifth biconcave negative lens, a sixth biconvex positive lens, a protective glass and an image plane IMA are sequentially arranged along the incident direction from left to right along an optical axis; the first meniscus negative lens has negative optical power, and the image side surface is a concave surface; the second meniscus negative lens has negative optical power, and the object side surface is a convex surface, and the image side surface is a concave surface; the third biconvex positive lens has positive optical power, and the object side surface is a convex surface or a concave surface, and the image side surface is a convex surface; the fourth biconvex positive lens has positive optical power, and the object side surface is a convex surface, and the image side surface is a convex surface or a concave surface; the fifth biconcave negative lens has negative optical power, and the object side surface is a concave surface, and the image side surface is a concave surface; the sixth biconvex positive lens has positive optical power, and the object side surface is a convex surface, and the image side surface is a convex surface. The high-resolution and wide-angle vehicle-mounted fisheye optical lens provided by the present invention is composed of 2 glass spherical lenses and 4 plastic aspherical lenses, has a simple structure, a small size, and a low cost, can achieve clear imaging in the range of -40° to 85°, has a small temperature drift, meets the 2-megapixel imaging requirement, has a larger field of view and imaging element than the optical lens in the prior art, the maximum field of view DFOV can reach 210°, the maximum imaging element can reach 6mm, the resolution is higher to meet the 2-megapixel imaging requirement, and can match a larger sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 It is the MTF curve diagram of the present invention;

[0038] Figure 3 It is the defocus curve diagram of the present invention. DETAILED DESCRIPTION

[0039] 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, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0040] like Figure 1-3 As shown, a high-resolution and wide-angle vehicle-mounted fisheye optical lens is provided with a first meniscus negative lens 1, a second meniscus negative lens 2, a third biconvex positive lens 3, a fourth biconvex positive lens 4, a fifth biconcave negative lens 5, a sixth biconvex positive lens 6, a protective glass 7 and an image plane IMA 8 in sequence along the optical axis from left to right in the incident direction; an aperture 9 is located between the third biconvex positive lens 3 and the fourth biconvex positive lens 4;

[0041] The first negative meniscus lens 1 has negative optical power, and the image side surface is concave;

[0042] The second negative meniscus lens 2 has negative optical power, and its object side surface is convex and its image side surface is concave;

[0043] The third biconvex positive lens 3 has positive power, its object side surface is convex or concave, and its image side surface is convex;

[0044] The fourth curved biconvex positive lens 4 has positive power, its object side surface is convex, and its image side surface is convex or concave;

[0045] The fifth double concave negative lens 5 has negative optical power, and its object side surface is concave, and its image side surface is concave;

[0046] The sixth biconvex positive lens 6 has positive power, and its object side surface is convex, and its image side surface is convex;

[0047] At the same time, the following conditions must be met:

[0048] -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;

[0049] Among them, f1, f2, f3, f4, f5, and f6 are respectively the focal lengths of the first meniscus negative lens 1, the second meniscus negative lens 2, the third biconvex positive lens 3, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5, and the sixth biconvex positive lens 6; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

[0050] The first meniscus negative lens 1 and the third biconvex positive lens 3 are glass spherical lenses, and the second meniscus negative lens 2, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens 6 are plastic aspherical lenses.

[0051] In the high-resolution and wide-angle automotive fisheye optical lens, the difference in Abbe numbers of at least two adjacent lenses is 20-25, excluding 20 and 25.

[0052] The fourth curved biconvex positive lens 4 and the fifth biconcave negative lens 5 are optically cemented cemented lenses or separated lenses.

[0053] The vehicle-mounted fisheye optical lens meets the following conditions:

[0054] BFL / TTL≤0.3

[0055] Among them, BFL is the distance from the center of the image side surface of the last lens (the sixth biconvex positive lens 6) of the vehicle-mounted fisheye optical lens to the imaging surface (image surface IMA 8) of the vehicle-mounted fisheye optical lens on the optical axis; TTL is the distance from the center of the object side surface of the first meniscus negative lens 1 to the image surface IMA 8 on the optical axis.

[0056] The vehicle-mounted fisheye optical lens meets the following conditions:

[0057] FOV / h / D≤5

[0058] 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 maximum 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.

[0059] The vehicle-mounted fisheye optical lens meets the following conditions:

[0060] (FOV×f) / h≥35

[0061] Among them, FOV is the maximum field of view angle 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 angle of the vehicle-mounted fisheye optical lens.

[0062] The vehicle-mounted fisheye optical lens meets the following conditions:

[0063] TTL / f≤20

[0064] Wherein, TTL is the distance from the center of the object side surface of the first meniscus negative lens 1 to the imaging surface (image surface IMA8) of the vehicle-mounted fisheye optical lens on the optical axis.

[0065] The present invention also provides a surround-view vehicle-mounted lens, comprising a high-resolution and large-viewing-angle vehicle-mounted fisheye optical lens.

[0066] Example 1

[0067] like Figure 1-3 As shown, a high-resolution and wide-angle vehicle-mounted fisheye optical lens is provided with a first meniscus negative lens 1, a second meniscus negative lens 2, a third biconvex positive lens 3, a fourth biconvex positive lens 4, a fifth biconcave negative lens 5, a sixth biconvex positive lens 6, a protective glass 7 and an image plane IMA 8 in sequence along the optical axis from left to right in the incident direction; an aperture 9 is located between the third biconvex positive lens 3 and the fourth biconvex positive lens 4;

[0068] The first negative meniscus lens 1 has negative optical power, and the image side surface is concave;

[0069] The second negative meniscus lens 2 has negative optical power, and its object side surface is convex and its image side surface is concave;

[0070] The third biconvex positive lens 3 has positive power, its object side surface is convex or concave, and its image side surface is convex;

[0071] The fourth curved biconvex positive lens 4 has positive power, its object side surface is convex, and its image side surface is convex or concave;

[0072] The fifth double concave negative lens 5 has negative optical power, and its object side surface is concave, and its image side surface is concave;

[0073] The sixth biconvex positive lens 6 has positive power, and its object side surface is convex, and its image side surface is convex;

[0074] At the same time, the following conditions must be met:

[0075] -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;

[0076] Among them, f1, f2, f3, f4, f5, and f6 are respectively the focal lengths of the first meniscus negative lens 1, the second meniscus negative lens 2, the third biconvex positive lens 3, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5, and the sixth biconvex positive lens 6; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens.

[0077] The first meniscus negative lens 1 and the third biconvex positive lens 3 are glass spherical lenses, and the second meniscus negative lens 2, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens 6 are plastic aspherical lenses.

[0078] The optical parameters of the first meniscus negative lens 1, the second meniscus negative lens 2, the third biconvex positive lens 3, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5, the sixth biconvex positive lens 6, the protective glass 7 and the image plane IMA 8 are shown in Table 1:

[0079] Table 1

[0080]

[0081] In Table 1, when the radius of curvature of the surface of the aperture 9 and the protective glass 7 is infinite, it means that the surface is a plane.

[0082] The high-resolution and wide-angle automotive fisheye optical lens meets the following conditions, see Table 2:

[0083] Table 2

[0084] project TTL / f FOV×f / h FOV / h / D BFL / TTL scope ≤20 ≥35 ≤5 ≤0.3

[0085] 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 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; D is the maximum light clearance 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 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 surface (image plane IMA 8) of the vehicle-mounted fisheye optical lens on the optical axis.

[0086] The aspheric surface shapes of the second meniscus negative lens 2, the fourth biconvex positive lens 4, the fifth biconcave negative lens 5 and the sixth biconvex positive lens 6 are described as follows:

[0087]

[0088] Among them, Z is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c = 1 / r, r represents the radius of curvature of the aspheric mirror surface; k is the cone coefficient conic, A, B, C, D, E, F, G are the coefficients of the high-order terms of the aspheric surface, and the specific parameters are shown in Table 3.

[0089] Table 3

[0090]

[0091] from Figure 2 It can be seen from the MTF curve that the center and periphery have higher imaging quality when 120lp / mm. Figure 3 It can be seen that the defocus curve is relatively concentrated, which means good processability.

[0092] Modules not specifically described in the present invention may adopt existing products and will not be described in detail here.

[0093] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-resolution and wide-angle vehicle-mounted fisheye optical lens, characterized in that: A first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth biconvex positive lens, a fifth biconcave negative lens, a sixth biconvex positive lens, a protective glass and an image plane IMA are sequentially arranged along the optical axis from left to right in the incident direction; the aperture is located between the third biconvex positive lens and the fourth biconvex positive lens; The first meniscus negative lens has negative optical power, and the image side surface is concave; The second negative meniscus lens has negative optical power, and its object side surface is convex and its image side surface is concave; The third biconvex positive lens has positive power, its object side surface is convex or concave, and its image side surface is convex; The fourth curved biconvex positive lens has positive power, its object side surface is convex, and its image side surface is convex or concave; The fifth biconcave negative lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The sixth biconvex positive lens has positive power, and its object side surface is convex, and its image side surface is convex; At the same time, the following conditions must be 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, and f6 are the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the third biconvex positive lens, the fourth biconvex positive lens, the fifth biconcave negative lens, and the sixth biconvex positive lens, respectively; f is the focal length of the entire group of the vehicle-mounted fisheye optical lens; The difference between the Abbe numbers of at least two adjacent lenses is 20-25, excluding 20 and 25; The vehicle-mounted fisheye optical lens meets the following conditions: BFL / TTL≤0.3; Wherein, 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 from the center of the object side surface of the first meniscus negative lens to the image plane IMA 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 maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view of the vehicle-mounted fisheye optical lens; The vehicle-mounted fisheye optical lens meets the following conditions: (FOV×f) / h≥35; The vehicle-mounted fisheye optical lens meets the following conditions: TTL / f≤20.

2. The high-resolution and wide-angle vehicle-mounted fisheye optical lens according to claim 1, characterized in that: The first meniscus negative lens and the third biconvex positive lens are glass spherical lenses, and the second meniscus negative lens, the fourth biconvex positive lens, the fifth biconcave negative lens and the sixth biconvex positive lens are plastic aspherical lenses.

3. The high-resolution and wide-angle vehicle-mounted fisheye optical lens according to claim 1, characterized in that: The fourth curved biconvex positive lens and the fifth biconcave negative lens are optically cemented cemented lenses or separate lenses.

4. The high-resolution and wide-angle vehicle-mounted fisheye optical lens according to claim 1, characterized in that: The aspheric surface shapes of the second meniscus negative lens, the fourth biconvex positive lens, the fifth biconcave negative lens and the sixth biconvex positive lens are described as follows: Among them, Z is the distance vector height from the aspherical surface to the vertex of the aspherical surface at a height of h along the optical axis; c = 1 / r, r represents the radius of curvature of the aspherical mirror surface; k is the cone coefficient conic; A, B, C, D, E, F, G are the coefficients of the high-order terms of the aspherical surface.

5. A surround view vehicle-mounted lens, characterized in that: It comprises a high-resolution and wide-viewing angle vehicle-mounted fisheye optical lens as described in any one of claims 1-4.

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