CN114114643A - A high-definition car side-view optical lens and imaging device - Google Patents
A high-definition car side-view optical lens and imaging device Download PDFInfo
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- CN114114643A CN114114643A CN202111629961.5A CN202111629961A CN114114643A CN 114114643 A CN114114643 A CN 114114643A CN 202111629961 A CN202111629961 A CN 202111629961A CN 114114643 A CN114114643 A CN 114114643A
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- G—PHYSICS
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- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention discloses a high-definition automobile side-looking optical lens and imaging equipment, wherein the high-definition automobile side-looking optical lens comprises a first negative meniscus lens, a second lens, a third lens, a diaphragm, a fourth double-concave negative lens, a fifth double-convex positive lens, a sixth double-convex positive lens, an optical filter IR, protective glass CG and an image plane IMA which are sequentially arranged along an optical axis from left to right incidence direction, the first negative meniscus lens has negative focal power, the second lens has positive focal power or negative focal power, the third lens has positive focal power or negative focal power, the fourth double-concave negative lens has negative focal power, the fifth double-convex positive lens has positive focal power, and the sixth double-convex positive lens has positive focal power. The invention reduces the distortion of the lens by reasonably configuring the surface type, focal power, curvature radius, material and the like of each lens, improves the definition of the lens, is convenient to realize miniaturization, overcomes the problems of low resolution, poor temperature stability and high cost in the prior art, and is suitable for the field of automobile side-viewing systems and automatic driving.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to a high-definition automobile side-viewing optical lens and imaging equipment.
Background
In recent years, with the increasing requirements of people on automobile safety, vehicle-mounted cameras are increasingly applied to auxiliary driving of automobiles, the surrounding environment of the automobile in the driving process can be fed back to a driver, and the driving safety of the automobile is improved. Wherein, look sideways at vehicle-mounted camera lens mainly used and collect the road conditions information of car both sides, avoid the emergence of traffic accident.
However, the resolution of images shot by the camera lens of the existing side-looking camera lens in a complex driving environment is low, the requirement of a large field angle cannot be met, real-time and accurate monitoring of the surrounding environment of the vehicle cannot be completed, and certain driving risk exists.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a high-definition automobile side-viewing optical lens and imaging equipment.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
a high-definition automobile side-looking optical lens is characterized in that a first negative meniscus lens, a second lens, a third lens, a diaphragm, a fourth biconcave negative lens, a fifth biconvex positive lens, a sixth biconvex positive lens, an optical filter IR, protective glass CG and an image plane IMA are sequentially arranged along the incident direction of an optical axis from left to right, wherein the first negative meniscus lens has negative focal power, the object side surface of the first negative meniscus lens is a convex surface, the image side surface of the first negative meniscus lens is a concave surface, the second lens has positive focal power or negative focal power, the third lens has positive focal power or negative focal power, the fourth biconcave negative lens has negative focal power, the object side surface of the fourth negative meniscus negative lens is a concave surface, the image side surface of the fourth negative meniscus negative lens is a concave surface, the fifth biconvex positive lens has positive focal power, the object side surface of the fifth positive lens is a convex surface, the image side surface is a convex surface, the sixth biconvex positive focal power, the object side surface of the sixth positive lens is a convex surface, and the image side surface is a convex surface;
high definition car looks sideways at optical lens satisfies the conditional expression:
BFL/TTL＞0.28
the BFL is the distance from the image side center of the last lens of the high-definition automobile side-viewing optical lens to the imaging surface of the high-definition automobile side-viewing optical lens on the optical axis, and the TTL is the distance from the center of the object side surface of the first meniscus negative lens to the imaging surface of the high-definition automobile side-viewing optical lens on the optical axis.
In one embodiment, the maximum field of view angle FOV of the high-definition automotive side-looking optical lens, the entire group of focal length values f of the high-definition automotive side-looking optical lens, and the image height h corresponding to the maximum field of view angle of the high-definition automotive side-looking optical lens satisfy the following conditional expression:
60.5≤(FOV×f)/h≤61.5。
in one embodiment, the high-definition automobile side-view optical lens satisfies the following conditional expression:
-2.6≤f1/f≤-2.1，-3.8≤f2/f≤-2.4，1.7≤f3/f≤2.35，-1.4≤f4/f≤-0.85，1.1≤f5/f≤1.6，1.8≤f6/f≤2.4
wherein f1, f2, f3, f4, f5 and f6 are focal lengths of the first meniscus negative lens, the second lens, the third lens, the fourth biconcave negative lens, the fifth biconvex positive lens and the sixth biconvex positive lens in sequence.
In one embodiment, the refractive index Nd1 of the first negative meniscus lens is <1.55, and the abbe number Vd1 is > 60; the refractive index Nd2 of the second lens is less than 1.5, and the Abbe number Vd2 is more than 60; the refractive index Nd3 of the third lens is more than 1.75, and the Abbe number Vd3 is less than 35; the refractive index Nd4 of the fourth biconcave negative lens is more than 1.75, and the Abbe number Vd4 is less than 40; the refractive index Nd5 of the fifth biconvex positive lens is less than 1.7, and the Abbe number Vd5 is more than 50; the refractive index Nd6 of the sixth biconvex positive lens is less than 1.55, and the Abbe number Vd6 is more than 60.
In one embodiment, the high-definition automobile side-view optical lens satisfies the following conditional expression:
-2.6≤f1/f≤-2.1，1.7≤f2/f≤2.45，-6.0≤f3/f≤-2.5，-1.4≤f4/f≤-0.85，1.1≤f5/f≤1.6，1.8≤f6/f≤2.4
wherein f1, f2, f3, f4, f5 and f6 are focal lengths of the first meniscus negative lens, the second lens, the third lens, the fourth biconcave negative lens, the fifth biconvex positive lens and the sixth biconvex positive lens in sequence.
In one embodiment, the refractive index Nd1 of the first negative meniscus lens is <1.55, and the abbe number Vd1 is > 60; the refractive index Nd2 of the second lens is more than 1.75, and the Abbe number Vd2 is less than 35; the refractive index Nd3 of the third lens is less than 1.5, and the Abbe number Vd3 is more than 60; the refractive index Nd4 of the fourth biconcave negative lens is more than 1.75, and the Abbe number Vd4 is less than 40; the refractive index Nd5 of the fifth biconvex positive lens is less than 1.7, and the Abbe number Vd5 is more than 50; the refractive index Nd6 of the sixth biconvex positive lens is less than 1.55, and the Abbe number Vd6 is more than 60.
In one embodiment, one of the first negative meniscus lens, the second lens, the third lens, the fourth negative biconcave lens, the fifth positive biconvex lens and the sixth positive biconvex lens is a glass aspheric lens, and the remaining five lenses are glass spherical lenses.
In one embodiment, the sixth biconvex positive lens is a glass aspheric lens.
In one embodiment, the sixth biconvex positive lens satisfies dn/dt 6< -3.0 × 10-6And (c), wherein dn/dt6 represents a temperature coefficient of refractive index of the sixth biconvex positive lens.
The invention also discloses imaging equipment which comprises the high-definition automobile side-view optical lens and an imaging element, wherein the imaging element is used for converting an optical image formed by the high-definition automobile side-view optical lens into an electric signal.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a high-definition automobile side-looking optical lens and imaging equipment, wherein the high-definition automobile side-looking optical lens comprises six lenses, namely a first meniscus negative lens, a second lens, a third lens, a fourth biconcave negative lens, a fifth biconvex positive lens and a sixth biconvex positive lens, and the lens distortion is reduced by reasonably configuring the surface type, the focal power, the curvature radius, the material, the maximum view field angle FOV, the whole group focal length value f of the optical lens, the image height h corresponding to the maximum view field angle of the optical lens and the like of each lens, so that the definition of the lens is improved, the miniaturization is facilitated, the problems of low resolution, poor temperature stability and high cost in the prior art are solved, and the high-definition automobile side-looking optical lens is suitable for the fields of automobile side-looking systems and automatic driving.
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FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic structural diagram of example 2 of the present invention;
fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention is more clearly defined.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-3, a high definition optical lens for automobile side view is applicable to the field of automobile side view systems and automatic driving, and includes a first negative meniscus lens 1, a second lens 2, a third lens 3, a diaphragm 4, a fourth biconcave negative lens 5, a fifth biconvex positive lens 6, a sixth biconvex positive lens 7, a filter IR 8, a protective glass CG 9 and an image plane IMA10 sequentially disposed along an optical axis from left to right incident direction (i.e., from an object side to an image side along the optical axis), wherein the first negative meniscus lens 1 has a negative focal power, and an object side surface and an image side surface are convex and concave; the second lens 2 can have positive focal power and also can have negative focal power; the third lens 3 may have positive power or negative power; the fourth biconcave negative lens 5 has negative focal power, and the object side surface is a concave surface, and the image side surface is a concave surface; the fifth biconvex positive lens 6 has positive focal power, and the object side surface is a convex surface and the image side surface is a convex surface; the sixth biconvex positive lens 7 has positive focal power, and has a convex object-side surface and a convex image-side surface.
High definition car looks sideways at optical lens satisfies the conditional expression:
BFL/TTL＞0.28
the BFL is the distance from the center of the image side surface of the last lens of the high-definition automobile side-looking optical lens to the imaging surface of the high-definition automobile side-looking optical lens on the optical axis, and the 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 high-definition automobile side-looking optical lens on the optical axis; the optical back focus of the lens can be increased, and sufficient space is reserved for the module.
Satisfy the conditional expression between the maximum visual field angle FOV that high definition car looked at optical lens, the whole group focus value f that high definition car looked at optical lens and the image height h that high definition car looked at the maximum field angle of optical lens and corresponds:
the FOV xf/h is more than or equal to 60.5 and less than or equal to 61.5, and the three indexes are controlled, so that the lens distortion is more favorably reduced.
One of the first negative meniscus lens 1, the second lens 2, the third lens 3, the fourth negative biconcave lens 5, the fifth positive biconvex lens 6 and the sixth positive biconvex lens 7 is a glass aspheric lens, and the remaining five lenses are glass spherical lenses.
The second lens 2 and the third lens 3 can be mutually cemented into a cemented lens, and can also be independent lenses, the cemented lens can reduce or eliminate chromatic aberration, the improvement of the definition of lens imaging is facilitated, and the installation process is simpler. The focal power of the second lens 2 and the third lens 3 is reasonably distributed, which is beneficial to bearing light and reducing aberration.
The reasonable matching of the materials and focal power of the fourth biconcave negative lens 5 and the fifth biconvex positive lens 6 is beneficial to reducing the chromatic aberration of the system and improving the resolution of the system.
The sixth biconvex positive lens 7 satisfies dn/dt 6< -3.0 × 10-6Where dn/dt6 denotes a temperature coefficient of refractive index of the sixth biconvex positive lens 7.
In one or some embodiments, the high definition automotive side view optical lens further satisfies the conditional expression:
f1/f is more than or equal to 2.6 and less than or equal to-2.1, f2/f is more than or equal to 3.8 and less than or equal to-2.4, f3/f is more than or equal to 1.7 and less than or equal to 2.35, f4/f is more than or equal to-0.85, f5/f is more than or equal to 1.1 and less than or equal to 1.6, and f6/f is more than or equal to 1.8 and less than or equal to 2.4, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first negative meniscus lens 1, the second lens 2, the third lens 3, the fourth negative biconcave lens 5, the fifth positive biconvex lens 6 and the sixth positive biconvex lens 7 in sequence.
In one or some embodiments, the high definition automotive side view optical lens further satisfies the conditional expression:
f1/f is more than or equal to 2.6 and less than or equal to-2.1, f2/f is more than or equal to 1.7 and less than or equal to 2.45, f3/f is more than or equal to 6.0 and less than or equal to-2.5, f4/f is more than or equal to 1.4 and less than or equal to-0.85, f5/f is more than or equal to 1.1 and less than or equal to 1.6, and f6/f is more than or equal to 1.8 and less than or equal to 2.4, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first negative meniscus lens 1, the second lens 2, the third lens 3, the fourth double-concave negative lens 5, the fifth double convex positive lens 6 and the sixth double convex positive lens 7 in sequence.
Example 1
As shown in fig. 1, a high definition side-looking optical lens for an automobile is sequentially provided with a first negative meniscus lens 1, a second lens 2, a third lens 3, a diaphragm 4, a fourth double-concave negative lens 5, a fifth double-convex positive lens 6, a sixth double-convex positive lens 7, a filter IR 8, a protective glass CG 9 and an image plane IMA10 along an optical axis from left to right incident direction.
The first negative meniscus lens 1 has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the refractive index Nd1 of the first negative meniscus lens 1 is less than 1.55, and the Abbe number Vd1 is more than 60, so that light rays can be collected, and the size of a head can be reduced; the second lens 2 can have positive power and negative power, the refractive index Nd2 of the second lens 2 is less than 1.5, and the Abbe number Vd2 is more than 60; the third lens 3 can have positive focal power and negative focal power, the refractive index Nd3 of the third lens 3 is more than 1.75, and the Abbe number Vd3 is less than 35; the fourth biconcave negative lens 5 has negative focal power, the object side surface is a concave surface, the image side surface is a concave surface, the refractive index Nd4 of the fourth biconcave negative lens 5 is more than 1.75, and the Abbe number Vd4 is less than 40; the fifth double convex positive lens 6 has positive focal power, the object side surface of the fifth double convex positive lens is a convex surface, the image side surface of the fifth double convex positive lens 6 is a convex surface, the refractive index Nd5 of the fifth double convex positive lens 6 is less than 1.7, and the Abbe number Vd5 is more than 50; the sixth double convex positive lens 7 has positive focal power, the object side surface of the sixth double convex positive lens is a convex surface, the image side surface of the sixth double convex positive lens 7 is a convex surface, the refractive index Nd6 of the sixth double convex positive lens 7 is less than 1.55, and the Abbe number Vd6 is more than 60.
The high definition car of this embodiment looks sideways at optical lens satisfies the conditional expression:
-2.6≤f1/f≤-2.1，-3.8≤f2/f≤-2.4，1.7≤f3/f≤2.35，-1.4≤f4/f≤-0.85，1.1≤f5/f≤1.6，1.8≤f6/f≤2.4
the f1, the f2, the f3, the f4, the f5 and the f6 are focal lengths of the first meniscus negative lens 1, the second lens 2, the third lens 3, the fourth biconcave negative lens 5, the fifth biconvex positive lens 6 and the sixth biconvex positive lens 7 in sequence, and by reasonably matching focal lengths of the lenses, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
The high definition car of this embodiment looks sideways at optical lens satisfies the conditional expression:
BFL/TTL＞0.28
the BFL is the distance from the center of the image side surface of the last lens of the high-definition automobile side-looking optical lens to the imaging surface of the high-definition automobile side-looking optical lens on the optical axis, and the 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 high-definition automobile side-looking optical lens on the optical axis; the optical back focus of the lens can be increased, and sufficient space is reserved for the module.
Satisfy the conditional expression between the maximum visual field angle FOV that high definition car looked at optical lens, the whole group focus value f that high definition car looked at optical lens and the image height h that high definition car looked at the maximum field angle of optical lens and corresponds:
the FOV xf/h is more than or equal to 60.5 and less than or equal to 61.5, and the three indexes are controlled, so that the lens distortion is more favorably reduced.
One of the first negative meniscus lens 1, the second lens 2, the third lens 3, the fourth negative biconcave lens 5, the fifth positive biconvex lens 6 and the sixth positive biconvex lens 7 is a glass aspheric lens, and the remaining five lenses are glass spherical lenses.
The second lens 2 and the third lens 3 can be mutually cemented into a cemented lens, and can also be independent lenses, the cemented lens can reduce or eliminate chromatic aberration, the improvement of the definition of lens imaging is facilitated, and the installation process is simpler. The focal power of the second lens 2 and the third lens 3 is reasonably distributed, which is beneficial to bearing light and reducing aberration.
The reasonable matching of the materials and focal power of the fourth biconcave negative lens 5 and the fifth biconvex positive lens 6 is beneficial to reducing the chromatic aberration of the system and improving the resolution of the system.
The sixth biconvex positive lens 7 is preferably a glass aspheric lens, which is beneficial to folding light rays, reducing field curvature distortion and improving the imaging quality of the system.
As a specific embodiment, the sixth biconvex positive lens 7 satisfies dn/dt 6< -3.0 × 10-6Where dn/dt6 denotes a temperature coefficient of refractive index of the sixth biconvex positive lens 7.
Table 1 shows the surface type, radius of curvature R, thickness and material of each lens in the high definition automotive side-view optical lens of this embodiment, wherein the unit of the radius of curvature and the thickness is millimeters (mm).
TABLE 1
In table 1, when the radii of curvature of the surfaces of the diaphragm 4, the filter IR 8, the protective glass CG 9, and the image plane IMA10 are infinite, this surface is a plane.
Each aspherical surface shape is described as follows:
wherein, Z (h) 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, H is the coefficient of the aspheric high-order term.
TABLE 2
| Number of noodles | k | A | B | C | D | E | F | G | H |
| S12 | -1.09 | 0 | -9.310E-4 | 1.371E-4 | -1.563E-5 | 1.383E-6 | -3.635E-8 | 0 | 0 |
| S13 | -0.29 | 0 | 6.460E-4 | 1.539E-4 | -1.788E-5 | 1.154E-6 | -1.337E-8 | 0 | 0 |
Table 2 shows the conic coefficients and high-order term coefficients A, B, C, D, E, F, G, H of the aspherical lens surfaces S12, S13 in example 1.
The embodiment also discloses imaging equipment, which comprises the high-definition automobile side-view optical lens and the imaging element, wherein the imaging element is used for converting an optical image formed by the high-definition automobile side-view optical lens into an electric signal.
Example 2
As shown in fig. 2, in the present embodiment, a high definition side-looking optical lens for an automobile is disclosed, in which a first negative meniscus lens 1, a second lens 2, a third lens 3, a diaphragm 4, a fourth negative biconcave lens 5, a fifth positive biconvex lens 6, a sixth positive biconvex lens 7, a filter IR 8, a protective glass CG 9, and an image plane IMA10 are sequentially disposed along an optical axis from left to right incident direction.
The first negative meniscus lens 1 has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the refractive index Nd1 of the first negative meniscus lens 1 is less than 1.55, and the Abbe number Vd1 is more than 60, so that light rays can be collected, and the size of a head can be reduced; the second lens 2 can have positive power and negative power, the refractive index Nd2 of the second lens 2 is less than 1.5, and the Abbe number Vd2 is more than 60; the third lens 3 can have positive focal power and negative focal power, the refractive index Nd3 of the third lens 3 is more than 1.75, and the Abbe number Vd3 is less than 35; the fourth biconcave negative lens 5 has negative focal power, the object side surface is a concave surface, the image side surface is a concave surface, the refractive index Nd4 of the fourth biconcave negative lens 5 is more than 1.75, and the Abbe number Vd4 is less than 40; the fifth double convex positive lens 6 has positive focal power, the object side surface of the fifth double convex positive lens is a convex surface, the image side surface of the fifth double convex positive lens 6 is a convex surface, the refractive index Nd5 of the fifth double convex positive lens 6 is less than 1.7, and the Abbe number Vd5 is more than 50; the sixth double convex positive lens 7 has positive focal power, the object side surface of the sixth double convex positive lens is a convex surface, the image side surface of the sixth double convex positive lens 7 is a convex surface, the refractive index Nd6 of the sixth double convex positive lens 7 is less than 1.55, and the Abbe number Vd6 is more than 60.
The high definition car of this embodiment looks sideways at optical lens satisfies the conditional expression:
-2.6≤f1/f≤-2.1，-3.8≤f2/f≤-2.4，1.7≤f3/f≤2.35，-1.4≤f4/f≤-0.85，1.1≤f5/f≤1.6，1.8≤f6/f≤2.4
the f1, the f2, the f3, the f4, the f5 and the f6 are focal lengths of the first meniscus negative lens 1, the second lens 2, the third lens 3, the fourth biconcave negative lens 5, the fifth biconvex positive lens 6 and the sixth biconvex positive lens 7 in sequence, and by reasonably matching focal lengths of the lenses, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
The high definition car of this embodiment looks sideways at optical lens satisfies the conditional expression:
BFL/TTL＞0.28
the BFL is the distance from the center of the image side surface of the last lens of the high-definition automobile side-looking optical lens to the imaging surface of the high-definition automobile side-looking optical lens on the optical axis, and the 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 high-definition automobile side-looking optical lens on the optical axis; the optical back focus of the lens can be increased, and sufficient space is reserved for the module.
Satisfy the conditional expression between the maximum visual field angle FOV that high definition car looked at optical lens, the whole group focus value f that high definition car looked at optical lens and the image height h that high definition car looked at the maximum field angle of optical lens and corresponds:
the FOV xf/h is more than or equal to 60.5 and less than or equal to 61.5, and the three indexes are controlled, so that the lens distortion is more favorably reduced.
The second lens 2 and the third lens 3 can be mutually cemented into a cemented lens, which can reduce or eliminate chromatic aberration, is beneficial to improving the definition of lens imaging, and has simpler installation process. The focal power of the second lens 2 and the third lens 3 is reasonably distributed, which is beneficial to bearing light and reducing aberration.
The reasonable matching of the materials and focal power of the fourth biconcave negative lens 5 and the fifth biconvex positive lens 6 is beneficial to reducing the chromatic aberration of the system and improving the resolution of the system.
The sixth biconvex positive lens 7 is a glass aspheric lens which is beneficial to folding light rays, reducing field curvature distortion and improving the imaging quality of the system, and the sixth biconvex positive lens 6 meets the requirement that dn/dt6 is less than-3.0 multiplied by 10-6Where dn/dt6 denotes a temperature coefficient of refractive index of the sixth biconvex positive lens 7.
Table 3 shows the surface type, radius of curvature R, thickness and material of each lens in the high definition automotive side-view optical lens of this embodiment, wherein the unit of the radius of curvature and the thickness is millimeters (mm).
TABLE 3
In table 3, when the radii of curvature of the surfaces of the diaphragm 4, the filter IR 8, the protective glass CG 9, and the image plane IMA10 are infinite, this surface is a plane.
TABLE 4
Table 4 shows the conic coefficients and high-order term coefficients A, B, C, D, E, F, G, H of the aspherical lens surfaces S11, S12 in example 2.
The same as in example 1.
Example 3
As shown in fig. 3, in the present embodiment, a high definition side-looking optical lens for an automobile is disclosed, in which a first negative meniscus lens 1, a second lens 2, a third lens 3, a diaphragm 4, a fourth negative biconcave lens 5, a fifth positive biconvex lens 6, a sixth positive biconvex lens 7, a filter IR 8, a protective glass CG 9, and an image plane IMA10 are sequentially disposed along an optical axis from left to right incident direction.
The first negative meniscus lens 1 has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the refractive index Nd1 of the first negative meniscus lens 1 is less than 1.55, and the Abbe number Vd1 is more than 60, so that the light collection is facilitated, and the size of the head is reduced; the second lens 2 can have positive optical power and negative optical power, the refractive index Nd2 of the second lens 2 is more than 1.75, and the Abbe number Vd2 is less than 35; the third lens 3 can have positive focal power and negative focal power, the refractive index Nd3 of the third lens 3 is less than 1.5, the Abbe number Vd3 is more than 60, the fourth biconcave negative lens 5 has negative focal power, the object side surface of the fourth biconcave negative lens 5 is a concave surface, the image side surface of the fourth biconcave negative lens 5 is a concave surface, the refractive index Nd4 of the fourth biconcave negative lens 5 is more than 1.75, and the Abbe number Vd4 is less than 40; the fifth double convex positive lens 6 has positive focal power, the object side surface of the fifth double convex positive lens is a convex surface, the image side surface of the fifth double convex positive lens 6 is a convex surface, the refractive index Nd5 of the fifth double convex positive lens 6 is less than 1.7, and the Abbe number Vd5 is more than 50; the sixth double convex positive lens 7 has positive focal power, the object side surface of the sixth double convex positive lens is a convex surface, the image side surface of the sixth double convex positive lens 7 is a convex surface, the refractive index Nd6 of the sixth double convex positive lens 7 is less than 1.55, and the Abbe number Vd6 is more than 60.
The high definition car of this embodiment looks sideways at optical lens satisfies the conditional expression:
-2.6≤f1/f≤-2.1，1.7≤f2/f≤2.45，-6.0≤f3/f≤-2.5，-1.4≤f4/f≤-0.85，1.1≤f5/f≤1.6，1.8≤f6/f≤2.4
the f1, the f2, the f3, the f4, the f5 and the f6 are focal lengths of the first meniscus negative lens 1, the second lens 2, the third lens 3, the fourth biconcave negative lens 5, the fifth biconvex positive lens 6 and the sixth biconvex positive lens 7 in sequence, and by reasonably matching focal lengths of the lenses, the assembly sensitivity is favorably reduced, and the assembly yield of the lens is improved.
Table 5 shows the surface type, the radius of curvature R, the thickness and the material of each lens in the high definition automotive side-view optical lens of the present embodiment, wherein the radius of curvature and the thickness are all in millimeters (mm).
TABLE 5
In table 5, when the radii of curvature of the surfaces of the diaphragm 4, the filter IR 8, the protective glass CG 9, and the image plane IMA10 are infinite, this surface is a plane.
TABLE 6
| Number of noodles | k | A | B | C | D | E | F | G | H |
| S11 | -0.14 | 0 | -2.394E-3 | 1.3543E-4 | -1.229E-5 | 2.8963E-7 | -1.919E-9 | 0 | 0 |
| S12 | 0.07 | 0 | 1.0258E-3 | -1.083E-4 | 1.4232E-5 | -9.197E-7 | 1.441E-8 | 0 | 0 |
Table 6 shows the conic coefficients and high-order term coefficients A, B, C, D, E, F, G, H of the aspherical lens surfaces S11, S12 in example 3.
The same as in example 1.
The parts which are not described in detail adopt the prior art, and can be directly purchased in the market, and are not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
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