A high-resolution and wide-angle vehicle optical lens and a vehicle rearview mirror

Abstract

The present invention discloses a high-resolution, wide-angle vehicle optical lens and a vehicle rearview mirror, comprising a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth meniscus negative lens, a fifth biconvex positive lens, a parallel flat plate and an image plane IMA, which are sequentially arranged along the incident direction from left to right along the optical axis. The high-resolution, wide-angle vehicle optical lens and the vehicle rearview mirror provided by the present invention are composed of two glass spherical lenses and three plastic aspherical lenses. The fourth meniscus negative lens and the fifth biconvex positive lens can be glued into a glued lens or a separate lens. The overall structure is simple, the volume is small, and the cost is low. Clear imaging can be achieved within the range of ‑40° to 85°, the temperature drift is small, and the imaging requirement of 2 million pixels is met. It has a larger field of view and matches a larger image sensor. The field of view range that can be photographed can reach 164°, and the maximum imaging element can reach 4.8mm.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a high-resolution and large-viewing-angle vehicle-mounted optical lens and a vehicle rearview mirror. 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 rear-view vehicle-mounted lens is an important part of the advanced driver assistance system. The driver can intuitively see the obstacles behind the car through the rear-view vehicle-mounted lens to avoid driving accidents. However, the image resolution captured by traditional rear-view cameras is low, and it is impossible to achieve high-definition imaging while shooting a wide angle range. The driving assistance system cannot accurately judge the environmental information around the vehicle in real time and make timely warnings or avoidance, 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 optical lens and a vehicle rearview mirror, which are suitable for the field of automobile systems and automatic 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 optical lens, comprising a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth meniscus negative lens, a fifth biconvex positive lens, a parallel flat plate and an image plane IMA, which are sequentially arranged along an optical axis from left to right in the incident direction; an aperture is located in the middle of the third biconvex positive lens 3 and the fourth meniscus negative lens 4;

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

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

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

[0009] The fourth meniscus negative lens has negative optical power, and its object side surface is convex and its image side surface is concave;

[0010] The fifth biconvex positive lens has positive power, the object side surface is convex, and the image side surface is convex or concave;

[0011] The following conditions are met:

[0012] -4.6≤f1 / f≤-2.6,-3.6≤f2 / f≤-1.6,1.4≤f3f≤3.4,-2.2≤f4 / f≤-0.2,0.2≤f5 / f≤2.2;

[0013] Among them, f1, f2, f3, f4, and f5 are respectively the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the third biconvex positive lens, the fourth meniscus negative lens, and the fifth biconvex positive lens, and f is the focal length value of the entire group of vehicle-mounted optical lenses.

[0014] Furthermore, the first meniscus negative lens and the third biconvex positive lens are glass spherical lenses, and the second meniscus negative lens, the fourth meniscus negative lens and the fifth biconvex positive lens are plastic aspherical lenses.

[0015] Furthermore, the vehicle-mounted optical lens has at least two adjacent lenses whose Abbe number difference is 20-25, excluding 20 and 25.

[0016] Furthermore, the vehicle-mounted optical lens meets the following conditions:

[0017] BFL / TTL≤0.3

[0018] Among them, BFL is the distance from the center of the image side surface of the fifth biconvex positive lens to the image plane IMA 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 of the optical lens on the optical axis.

[0019] Furthermore, the first meniscus negative lens satisfies the following conditions:

[0020] TTL / f≤15

[0021] 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 set of vehicle-mounted optical lenses.

[0022] Furthermore, the vehicle-mounted optical lens meets the following conditions:

[0023] FOV / h / D≤5

[0024] Among them, FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; D is the maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view angle of the vehicle-mounted optical lens.

[0025] Furthermore, the vehicle-mounted optical lens meets the following conditions:

[0026] (FOV×f) / h≥35

[0027] Among them, FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; and f is the focal length value of the entire set of the vehicle-mounted optical lens.

[0028] Furthermore, the aspherical surfaces of the second meniscus negative lens, the fourth meniscus negative lens and the fifth biconvex positive lens of the vehicle-mounted optical lens satisfy the following formula:

[0029]

[0030] 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.

[0031] The invention discloses a car rearview mirror, comprising a car-mounted optical lens with high resolution and large viewing angle.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The invention discloses a high-resolution and large-angle vehicle-mounted optical lens, comprising a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth meniscus negative lens, a fifth biconvex positive lens, a parallel flat plate and an image plane IMA, which are arranged in sequence along the incident direction from left to right along the optical axis; the aperture is located in the middle of the third biconvex positive lens 3 and the fourth meniscus negative lens 4; 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 its object side surface is a convex surface or a concave surface, and the image side surface is a concave surface; the third biconvex positive lens has positive optical power, and its object side surface is a convex surface, and the image side surface is a convex surface; the fourth meniscus negative lens has negative optical power, and its object side surface is a convex surface, and the image side surface is a concave surface; the fifth biconvex positive lens has positive optical power, and its object side surface is a convex surface, and the image side surface is a convex surface;

[0034] The following conditions are met:

[0035] -4.6≤f1 / f≤-2.6,-3.6≤f2 / f≤-1.6,1.4≤f3f≤3.4,-2.2≤f4 / f≤-0.2,0.2≤f5 / f≤2.2;

[0036] Among them, f1, f2, f3, f4, f5 are respectively the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the third biconvex positive lens, the fourth meniscus negative lens, and the fifth biconvex positive lens, and f is the focal length value of the entire group of vehicle optical lenses. The high-resolution and wide-angle vehicle optical lens and automobile rearview mirror provided by the present invention are composed of 2 glass spherical lenses and 3 plastic aspherical lenses. The fourth meniscus negative lens and the fifth biconvex positive lens can be glued into a glued lens or a separate lens. The overall structure is simple, the volume is small, and the cost is low. Clear imaging can be achieved within the range of -40° to 85°, the temperature drift is small, and the imaging requirements of 2 million pixels are met. It has a larger field of view and matches a larger image sensor. The field of view range that can be shot can reach 164°, and the maximum imaging element can reach 4.8mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Figure 2 It is the MTF curve diagram of the present invention;

[0039] Figure 3 It is the defocus curve diagram of the present invention. DETAILED DESCRIPTION

[0040] 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.

[0041] like Figure 1-3 As shown, a high-resolution and wide-angle vehicle optical lens comprises a first meniscus negative lens 1, a second meniscus negative lens 2, a third biconvex positive lens 3, a fourth meniscus negative lens 4, a fifth biconvex positive lens 5, a parallel plate 6 and an image plane IMA 7, which are sequentially arranged along the optical axis from left to right in the incident direction; an aperture 8 is located between the third biconvex positive lens 3 and the fourth meniscus negative lens 4;

[0042] The first negative meniscus lens 1 has negative optical power, and the image side surface is concave;

[0043] The second negative meniscus lens 2 has negative optical power, and its object side surface is convex or concave, and its image side surface is concave;

[0044] The third biconvex positive lens 3 has positive power, and its object side surface is convex, and its image side surface is convex;

[0045] The fourth meniscus negative lens 4 has negative optical power, and its object side surface is convex and its image side surface is concave;

[0046] The fifth biconvex positive lens 5 has positive power, its object side surface is convex, and its image side surface is convex or concave;

[0047] The following conditions are met:

[0048] -4.6≤f1 / f≤-2.6,-3.6≤f2 / f≤-1.6,1.4≤f3f≤3.4,-2.2≤f4 / f≤-0.2,0.2≤f5 / f≤2.2; wherein, f1, f2, f3, f4, f5 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 meniscus negative lens 4, and the fifth biconvex positive lens 5, and f is the focal length value of the entire group of the vehicle-mounted optical lens.

[0049] 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 meniscus negative lens 4 and the fifth biconvex positive lens 5 are plastic aspherical lenses.

[0050] The fourth meniscus negative lens 4 and the fifth biconvex positive lens 5 can form a cemented lens or a separate lens.

[0051] The vehicle-mounted optical lens has at least two adjacent lenses whose Abbe number difference is 20-25, excluding 20 and 25.

[0052] The vehicle-mounted optical lens meets the following conditions:

[0053] BFL / TTL≤0.3

[0054] Among them, BFL is the distance from the center of the image side surface of the last lens (the fifth biconvex positive lens 5) of the vehicle-mounted optical lens to the imaging surface of the vehicle-mounted optical lens (the imaging surface here is the image surface IMA7) 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 imaging surface of the optical lens (the imaging surface here is the image surface IMA 7) on the optical axis.

[0055] The vehicle-mounted optical lens meets the following conditions:

[0056] FOV / h / D≤5

[0057] Among them, FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; D is the maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view angle of the vehicle-mounted optical lens.

[0058] The vehicle-mounted optical lens meets the following conditions:

[0059] (FOV×f) / h≥35

[0060] Among them, FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; and f is the focal length value of the entire set of the vehicle-mounted optical lens.

[0061] The first meniscus negative lens meets the following conditions:

[0062] TTL / F≤15

[0063] Wherein, TTL is the distance on the optical axis from the center of the object side of the first meniscus negative lens 1 to the imaging surface of the vehicle-mounted optical lens (the imaging surface here is specifically the image surface IMA 7); f is the entire set of focal length values ​​of the vehicle-mounted optical lens.

[0064] The aspherical surfaces of the second meniscus negative lens 2, the fourth meniscus negative lens 4 and the fifth biconvex positive lens 5 of the vehicle-mounted optical lens satisfy the following formula:

[0065]

[0066] 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.

[0067] The invention also provides a car rearview mirror, comprising a car-mounted optical lens with high resolution and large viewing angle.

[0068] Example 1

[0069] like Figure 1-3 As shown, a high-resolution and wide-angle vehicle optical lens comprises a first meniscus negative lens 1, a second meniscus negative lens 2, a third biconvex positive lens 3, a fourth meniscus negative lens 4, a fifth biconvex positive lens 5, a parallel plate 6 and an image plane IMA 7, which are sequentially arranged along the optical axis from left to right in the incident direction; an aperture 8 is located between the third biconvex positive lens 3 and the fourth meniscus negative lens 4;

[0070] The first negative meniscus lens 1 has negative optical power, and the image side surface is concave;

[0071] The second negative meniscus lens 2 has negative optical power, and its object side surface is convex or concave, and its image side surface is concave;

[0072] The third biconvex positive lens 3 has positive power, and its object side surface is convex, and its image side surface is convex;

[0073] The fourth meniscus negative lens 4 has negative optical power, and its object side surface is convex and its image side surface is concave;

[0074] The fifth biconvex positive lens 5 has positive power, its object side surface is convex, and its image side surface is convex or concave;

[0075] The following conditions are met:

[0076] -4.6≤f1 / f≤-2.6,-3.6≤f2 / f≤-1.6,1.4≤f3f≤3.4,-2.2≤f4 / f≤-0.2,0.2≤f5 / f≤2.2; wherein, f1, f2, f3, f4, f5 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 meniscus negative lens 4, and the fifth biconvex positive lens 5, and f is the focal length value of the entire group of the vehicle-mounted optical lens.

[0077] The optical parameters of the first meniscus negative lens 1, the second meniscus negative lens 2, the third biconvex positive lens 3, the fourth meniscus negative lens 4, and the fifth biconvex positive lens 5 are shown in Table 1:

[0078] Table 1

[0079]

[0080]

[0081] In Table 1, when the curvature radius of the aperture 8 and the parallel plate 6 surface is infinite, it means that the surface is a plane and the parallel plate 6 is protected by glass.

[0082] The vehicle-mounted 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 ≤15 ≥35 ≤5 ≤0.3

[0085] Among them, TTL is the distance from the center of the object side of the first meniscus negative lens to the imaging surface of the optical lens on the optical axis; f is the focal length value of the entire set of vehicle-mounted optical lenses; FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; D is the maximum light clearance aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view angle of the vehicle-mounted optical lens; BFL is the distance from the center of the image side of the last lens of the vehicle-mounted optical lens to the imaging surface of the vehicle-mounted optical lens on the optical axis; TTL is the distance from the center of the object side of the first meniscus negative lens to the imaging surface of the optical lens on the optical axis.

[0086] The aspherical surfaces of the second meniscus negative lens 2, the fourth meniscus negative lens 4 and the fifth biconvex positive lens 5 of the vehicle-mounted optical lens satisfy the following formula:

[0087]

[0088] 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.

[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] The 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 optical lens, characterized in that: It includes a first meniscus negative lens, a second meniscus negative lens, a third biconvex positive lens, a fourth meniscus negative lens, a fifth biconvex positive lens, a parallel flat plate and an image plane IMA, which are sequentially arranged along the incident direction from left to right along the optical axis; the aperture is located in the middle of the third biconvex positive lens 3 and the fourth meniscus negative lens 4; The first meniscus negative lens has negative optical power, and the image side surface is concave; The second meniscus negative lens has negative optical power, and its object side surface is convex or concave, and its image side surface is concave; The third biconvex positive lens has positive power, and its object side surface is convex, and its image side surface is convex; The fourth meniscus negative lens has negative optical power, and its object side surface is convex and its image side surface is concave; The fifth biconvex positive lens has positive power, the object side surface is convex, and the image side surface is convex or concave; The following conditions are met: -4.6≤f1 / f≤-2.6, -3.6≤f2 / f≤-1.6, 1.4≤f3f≤3.4, -2.2≤f4 / f≤-0.2, 0.2≤f5 / f≤2.2; Among them, f1, f2, f3, f4, and f5 are the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the third biconvex positive lens, the fourth meniscus negative lens, and the fifth biconvex positive lens, respectively, and f is the focal length value of the entire set of vehicle-mounted optical lenses; The vehicle-mounted optical lens has at least two adjacent lenses whose Abbe number difference is 20-25, excluding 20 and 25; The vehicle-mounted 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 fifth biconvex positive lens to the image plane IMA 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 first meniscus negative lens satisfies the following conditions: TTL / f≤15; The vehicle-mounted optical lens meets the following conditions: FOV / h / D≤5; Among them, FOV is the maximum field of view angle of the vehicle-mounted optical lens; h is the image height corresponding to the maximum field of view angle of the vehicle-mounted optical lens; D is the maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view angle of the vehicle-mounted optical lens; The vehicle-mounted optical lens meets the following conditions: (FOV×f) / h≥35.

2. The high-resolution and wide-angle vehicle-mounted 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 meniscus negative lens and the fifth biconvex positive lens are plastic aspherical lenses.

3. The high-resolution and wide-angle vehicle-mounted optical lens according to claim 1, characterized in that: The aspherical surfaces of the second meniscus negative lens, the fourth meniscus negative lens and the fifth biconvex positive lens of the vehicle-mounted optical lens satisfy the following formula: 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.

4. A car rearview mirror, characterized in that: A vehicle-mounted optical lens with high resolution and large viewing angle as described in any one of claims 1-3.

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