CN117348205A - Low-distortion vehicle-mounted front-view optical system and camera module applied to same - Google Patents
Low-distortion vehicle-mounted front-view optical system and camera module applied to same Download PDFInfo
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- CN117348205A CN117348205A CN202311264715.3A CN202311264715A CN117348205A CN 117348205 A CN117348205 A CN 117348205A CN 202311264715 A CN202311264715 A CN 202311264715A CN 117348205 A CN117348205 A CN 117348205A
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- 201000009310 astigmatism Diseases 0.000 description 7
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The invention provides a low-distortion vehicle-mounted front view optical system and an imaging module applied to the same, wherein the optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along an optical axis from an object plane to an image plane, and the optical system has huge potential in the vehicle-mounted front view field by reasonably distributing the surface type and focal power of each lens, improving the identification degree of the optical system to a distant object in front by using a spherical and aspherical mixed optical system, and simultaneously considering the advantages of low distortion, high definition resolution, excellent temperature characteristics, ultrahigh pixels and the like.
Description
Technical Field
The application relates to the field of optical imaging, in particular to a low-distortion vehicle-mounted front-view optical system and a camera module applied to the same.
Background
Along with the progress of technology and the needs of social and economic development, automobile auxiliary systems are widely applied and popularized, optical systems and modules in the vehicle-mounted field are also widely applied, and the vehicle-mounted front-view optical lens plays an important role in the fields of collision, lane departure early warning, pedestrian detection early warning and the like. In order to meet the demands of various aspects in the driving process, the recognition degree of the system on the distant objects in front is required to be improved, and the characteristics of low distortion, high resolution, excellent temperature characteristics and ultra-high pixels are particularly shown on the optical lens, but the conventional vehicle-mounted front view optical lens cannot meet the demands.
Disclosure of Invention
In order to solve the problem of low recognition of the existing vehicle-mounted front view optical lens, the application provides a low-distortion vehicle-mounted front view optical system and an imaging module applied to the same, and the surface type and focal power of each lens are reasonably distributed, so that the recognition of the optical system to a distant object in front is improved by using a spherical surface and aspherical hybrid optical system, the distortion is low, and the high-resolution and temperature characteristic of high definition and the characteristic of ultrahigh pixels are considered.
The low-distortion vehicle-mounted front-view optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane along an optical axis;
the first lens has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, and the object side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens element has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the seventh lens has negative focal power, and the object side surface of the seventh lens is concave.
Preferably, the optical system satisfies the following relationship:
1.20＜f/TTL*ImgH＜3.50；
wherein f is the effective focal length of the optical system, TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and ImgH is half of the length of the effective pixel area on the imaging surface in the horizontal direction.
Preferably, the optical system satisfies the following condition:
-25.0mm＜f1＜-8.0mm；
8.0mm＜f2＜30.0mm；
15.5mm＜f3＜25.5mm；
5.0mm＜f4＜20.5mm；
-18.0mm＜f5＜-5.5mm；
19.5mm＜f6＜14.5mm；
-90.0mm＜f56＜-65.0mm；
-20.0mm＜f7＜-12.0mm；
wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f56 is the focal length of the cemented lens of the fifth lens and the sixth lens, and f7 is the focal length of the seventh lens.
Preferably, the optical system satisfies the following condition:
-3.0＜f1/f＜-0.8；
1.0＜f2/f＜5.5；
0.9＜f3/f＜3.0；
4.5＜f4/f＜10.5；
-1.5＜f5/f＜-0.2；
-2.5＜f6/f＜-0.8；
-7.5＜f56/f＜-2.5；
-1.2＜f7/f＜-0.3；
wherein f is an effective focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f56 is a focal length of a cemented lens combining the fifth lens and the sixth lens, and f7 is a focal length of the seventh lens.
Preferably, the curvature radius R22 of the image side surface and the curvature radius R21 of the object side surface of the second lens satisfy: R22/R21 is more than or equal to 3.
Preferably, the optical system satisfies the following condition: the object-side radius of curvature R71 and the image-side radius of curvature R72 of the seventh lens satisfy: R71/R72 is more than or equal to 0.2 and less than or equal to 0.45.
Preferably, a distance between a center of an object side surface of the first lens and an imaging surface of the optical lens on an optical axis is TTL and a focal length value f of the optical lens satisfies: TTL/f is less than or equal to 5.
Preferably, the refractive index Nd1 of the material of the first lens and the abbe number constant Vd1 of the material satisfy: nd1 is more than 1.65 and less than 2.00, vd1 is more than 20.00 and less than 60.00.
Preferably, the refractive index Nd2 of the material of the second lens and the abbe number constant Vd2 of the material satisfy: nd2 is more than 1.75 and less than 2.00, vd2 is more than 18.00 and less than 30.00.
Preferably, the refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens satisfy: nd3 is more than 1.55 and less than 1.67, vd3 is more than 52.00 and less than 65.00.
Preferably, the material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens satisfy: nd4 is more than 1.43 and less than 1.63, vd4 is more than 61.00 and less than 95.00.
Preferably, the refractive index Nd5 of the material and the abbe number constant Vd5 of the fifth lens satisfy: nd5 is more than 1.45 and less than 1.95, vd5 is more than 15.00 and less than 35.00.
Preferably, the refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens satisfy: nd6 is more than 1.67 and less than 1.80, vd6 is more than 27.00 and less than 50.00.
Preferably, the refractive index Nd7 of the material of the seventh lens and the abbe number constant Vd7 of the material satisfy: nd7 is more than 1.45 and less than 1.50, vd7 is more than 62.00 and less than 75.00.
Preferably, the full field angle FOV of the optical system satisfies: 25.00 < FOV < 36.00.
Preferably, the optical system satisfies the following condition: the fifth lens and the sixth lens form a cemented lens.
On the other hand, the embodiment of the application also provides an image pickup module, which at least comprises an optical lens, wherein the low-distortion vehicle-mounted front-view optical system is arranged in the optical lens.
Compared with the prior art, the beneficial effects of the application are as follows:
the low-distortion vehicle-mounted front view optical system and the imaging module applied to the same provided by the embodiment of the invention have the advantages that the optical system sequentially comprises the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens from an object plane to an image plane along an optical axis, the surface type and the focal power of each lens are reasonably distributed, the spherical and aspherical mixed optical system is used, the identification degree of the optical system on a far object in front is improved, and meanwhile, the advantages of low distortion, high definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are simultaneously considered, so that the low-distortion vehicle-mounted front view optical system has great potential in the vehicle-mounted front view field.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic diagram of the structure of an optical system or an optical lens according to embodiment 1 of the present application;
FIG. 2 is an astigmatism and distortion curve of an optical system or optical lens of example 1 of the present application;
FIG. 3 is a graph of the relative illuminance of an optical system or optical lens of example 1 of the present application;
FIG. 4 is an on-axis chromatic aberration curve of an optical system or optical lens of example 1 of the present application;
fig. 5 is a schematic structural view of an optical system or an optical lens according to embodiment 2 of the present application;
FIG. 6 is an astigmatism and distortion curve of an optical system or optical lens of example 2 of the present application;
FIG. 7 is a graph of relative illuminance of an optical system or optical lens according to example 2 of the present application;
fig. 8 is an on-axis chromatic aberration curve of the optical system or optical lens of embodiment 2 of the present application.
Detailed Description
As shown in fig. 1-8, the application provides a low-distortion vehicle-mounted front-view optical system, which sequentially comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 from an object plane to an image plane along an optical axis;
the first lens element E1 has negative refractive power, a concave object-side surface and a concave image-side surface;
the second lens E2 has positive focal power, and the object side surface of the second lens E2 is a convex surface;
the third lens element E3 has positive refractive power, and has a convex object-side surface and a convex image-side surface;
the fourth lens element E4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the fifth lens element E5 has negative refractive power, and has a concave object-side surface and a concave image-side surface;
the sixth lens element E6 with positive refractive power has a convex object-side surface and a convex image-side surface;
the seventh lens E7 has negative optical power, and the object side surface thereof is concave.
According to the low-distortion vehicle-mounted front view optical system, the optical system is composed of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6 and the seventh lens E7 in sequence from an object plane to an image plane along an optical axis, the surface type and focal power of each lens are reasonably distributed, and the spherical and aspheric hybrid optical system is used, so that the recognition of the optical system on a far object in front is improved, meanwhile, the advantages of low distortion, high resolution, excellent temperature characteristics, ultrahigh pixels and the like are considered, and the low-distortion vehicle-mounted front view optical system has huge potential in the vehicle-mounted front view field.
Preferably, the optical system satisfies the following relationship: 1.20 < f/TTL < ImgH < 3.50; wherein f is the effective focal length of the optical system, TTL is the distance from the center of the object side surface of the first lens E1 to the imaging surface of the optical lens on the optical axis, imgH is half of the horizontal length of the effective pixel area on the imaging surface, the relation reflects the constraint condition of the optical lens on the angle of view and the light and thin characteristics, when the relation is satisfied, the requirements of the optical lens on the small head and the light and thin property can be met on the basis of the optical lens, and the recognition of the optical system on the far object in front is improved.
Preferably, the optical system satisfies the following condition: -25.0mm < f1 < -8.0mm; f2 is more than 8.0mm and less than 30.0mm; f3 is less than 25.5mm and more than 15.5 mm; f4 is more than 5.0mm and less than 20.5mm; -18.0mm < f5 < -5.5mm; f6 is smaller than 14.5mm and is smaller than 19.5 mm; -90.0mm < f56 < -65.0mm; -20.0mm < f7 < -12.0mm; wherein f1 is a focal length of the first lens E1, f2 is a focal length of the second lens E2, f3 is a focal length of the third lens E3, f4 is a focal length of the fourth lens E4, f5 is a focal length of the fifth lens E5, f6 is a focal length of the sixth lens E6, f56 is a focal length of a cemented lens combining the fifth lens E5 and the sixth lens E6, and f7 is a focal length of the seventh lens E7. By reasonably distributing the focal length of each lens, the optical system has the advantages of high resolution, reduced volume and high visual angle definition.
Preferably, the optical system satisfies the following condition: -3.0 < f1/f < -0.8, and controlling the distortion of the system by restricting the effective focal length ratio of the first lens E1 and the optical system to be in a reasonable range, so that the imaging center has higher angular resolution;
preferably, the optical system satisfies the following condition: 1.0 < f2/f < 5.5, and the effective focal length ratio of the second lens E2 to the optical system is restricted in a reasonable range, so that lens aberration is optimized, and imaging quality is improved;
preferably, the optical system satisfies the following condition: f3/f is more than 0.9 and less than 3.0, and the spherical aberration of the system is finely adjusted and controlled by restraining the effective focal length ratio of the third lens E3 and the optical system in a reasonable range, so that the imaging quality of the system is effectively improved;
preferably, the optical system satisfies the following condition: the imaging quality of the system is effectively improved by reasonably controlling the effective focal length ratio range of the fourth lens E4 and the optical system, wherein f4/f is more than 4.5 and less than 10.5;
preferably, the optical system satisfies the following condition: -1.5 < f5/f < -0.2, improving the imaging quality by restricting the ratio of the optical power of the fifth lens E5 to the effective focal length of the optical system in a reasonable range, so that the optical system has the characteristic of low distortion;
preferably, the optical system satisfies the following condition: -2.5 < f6/f < -0.8, and optimizing lens aberration by restricting the effective focal length ratio of the sixth lens E6 to the optical system in a reasonable range, thereby improving the resolution performance;
preferably, the optical system satisfies the following condition: -7.5 < f56/f < -2.5, the ratio of the combined focal length of the fifth lens E5 and the sixth lens E6 to the effective focal length of the optical lens is restrained, so that the focal power of the fifth lens E5 and the focal length of the sixth lens E6 can be properly distributed, the balance of the internal aberration of the optical lens can be realized on the basis of meeting the miniaturization design of the optical lens, and further the adjustment of the field curvature and the astigmatism of the imaging edge of the optical lens is facilitated, and the imaging quality of the optical lens to the surrounding environment is met;
preferably, the optical system satisfies the following condition: -1.2 < f7/f < -0.3, and by restricting the effective focal length ratio of the seventh lens E7 to the optical system in a reasonable range, good optical performance can be ensured, lens aberration can be optimized, resolution performance can be improved, and the viewing angle can be further ensured;
in the above description, f is the effective focal length of the optical system, f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, f56 is the focal length of the cemented lens combining the fifth lens E5 and the sixth lens E6, and f7 is the focal length of the seventh lens E7.
Preferably, the curvature radius R22 of the image side surface and the curvature radius R21 of the object side surface of the second lens E2 satisfy: the R22/R21 is more than or equal to 3, and the design is favorable for increasing the aperture of the rear diaphragm and increasing the light quantity of the system.
Preferably, the optical system satisfies the following condition: the object-side radius of curvature R71 and the image-side radius of curvature R72 of the seventh lens E7 satisfy: the design improves the resolution of the lens, and the R71/R72 is more than or equal to 0.2 and less than or equal to 0.45.
Preferably, a distance between a center of the object side surface of the first lens E1 and an imaging surface of the optical lens on the optical axis is TTL and a focal length value f of the optical lens satisfies: the TTL/f is less than or equal to 5, and the design can realize the miniaturization characteristic of the lens.
Preferably, the refractive index Nd1 of the material and the abbe number constant Vd1 of the first lens E1 satisfy: nd1 is more than 1.65 and less than 2.00, vd1 is more than 20.00 and less than 60.00, the design can effectively weaken chromatic aberration, optimize lens aberration, and further effectively improve imaging quality of a system;
preferably, the refractive index Nd2 of the material of the second lens E2, the abbe number constant Vd2 of the material satisfy: nd2 is more than 1.75 and less than 2.00, vd2 is more than 18.00 and less than 30.00, the design can effectively weaken chromatic aberration, optimize lens aberration, and further effectively improve imaging quality of a system;
preferably, the refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens E3 satisfy: nd3 is more than 1.55 and less than 1.67, vd3 is more than 52.00 and less than 65.00, the design can ensure good optical performance, further ensure the visual angle, improve the resolving power of the lens and reduce the distortion;
preferably, the material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens E4 satisfy: nd4 is more than 1.43 and less than 1.63, vd4 is more than 61.00 and less than 95.00, the design can ensure good optical performance, further ensure the visual angle, improve the resolving power of the lens and reduce the distortion;
preferably, the refractive index Nd5 of the material and the abbe number constant Vd5 of the fifth lens E5 satisfy: nd5 is more than 1.45 and less than 1.95, vd5 is more than 15.00 and less than 35.00, the design can ensure good optical performance, further ensure the visual angle, improve the resolving power of the lens and reduce the distortion;
preferably, the refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens E6 satisfy: nd6 is more than 1.67 and less than 1.80, vd6 is more than 27.00 and less than 50.00, the design can effectively weaken chromatic aberration, optimize lens aberration, and further effectively improve imaging quality of a system;
preferably, the refractive index Nd7 of the material and the abbe number constant Vd7 of the seventh lens E7 satisfy: nd7 is more than 1.45 and less than 1.50, vd7 is more than 62.00 and less than 75.00, chromatic aberration can be effectively reduced, lens aberration is optimized, and imaging quality of the system is further effectively improved.
Preferably, the full field angle FOV of the optical system satisfies: the FOV is more than 25.00 and less than 36.00, the design can reduce the total optical length, so that the lens is miniaturized, and the optical system configured by the invention has the advantages of low distortion, high resolution, excellent temperature characteristic and ultrahigh pixel, has a compact structure, is convenient to process and install, and has good imaging resolving power.
Preferably, the optical system satisfies the following condition: the fifth lens E5 and the sixth lens E6 form a cemented lens, and first, the cemented lens is beneficial to eliminating chromatic aberration influence, reducing field curvature and correcting coma aberration; second, eliminating residual partial chromatic aberration to balance the overall chromatic aberration of the optical system; thirdly, the air interval between the two lenses is omitted, so that the whole optical system is compact, and the system miniaturization requirement is met; fourth, tolerance sensitivity such as tilting/decentering generated in the assembling process of the lens unit is reduced, and the total length of the lens is reduced.
Specifically, as a preferred embodiment of the present invention, without limitation, an optical imaging lens of example 1 of the present application is described with reference to fig. 1 to 4, and as shown in fig. 1, the optical imaging lens according to the exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an optical filter E8, and an imaging surface S16 in order from an object plane to an image plane along an optical axis.
The effective focal length f of the optical system, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S16, and half of the ImgH of the imaging surface in the horizontal direction of the effective pixel area satisfy: f/TTL imgh=1.945, the radius of curvature R22 of the image side surface S4 and the radius of curvature of the object side surface S3 of the second lens element E2 satisfy: the distance TTL between the center of the object side surface S1 of the first lens E1 and the imaging surface S16 of the optical lens on the optical axis and the focal length value f of the optical lens satisfy: TTL/f= 2.073, the radius of curvature R71 of the object-side surface S12 and the radius of curvature R72 of the image-side surface S13 of the seventh lens element E7 satisfy: r71/r72|=0.28.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave; the second lens E2 has positive focal power, and an object side surface S3 of the second lens is a convex surface; the third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex; the fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element E5 has negative refractive power, wherein an object-side surface S8 thereof is concave, and an image-side surface S9 thereof is concave; the sixth lens element E6 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex; the seventh lens element E7 has negative refractive power, and the object-side surface S12 thereof is concave. The fifth lens element E5 and the sixth lens element E6 are lens elements. The filter E8 has an object side surface S14 and an image side surface S15. Light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging surface S16.
Table 1 shows the surface types, radii of curvature, thicknesses, and materials of the respective lenses of the optical imaging lens of the embodiment, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 1: example 1 basic parameters of an optical System
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | Infinity is provided | |
| S1 | Spherical surface | -16.520 | 3.76 | 1.65,33.16 |
| S2 | Spherical surface | 30.758 | 0.51 | |
| S3 | Spherical surface | 15.924 | 2.85 | 1.95,21.79 |
| S4 | Spherical surface | 146.254 | 0.20 | |
| STO | Spherical surface | Infinity | 0.25 | |
| S6 | Aspherical surface | 17.179 | 3.61 | 1.60,65.82 |
| S7 | Aspherical surface | -38.782 | 0.12 | |
| S8 | Spherical surface | 19.127 | 4.94 | 1.62,63.41 |
| S9 | Spherical surface | -9.025 | 1.21 | 1.78,23.62 |
| S10 | Aspherical surface | 21.231 | 3.16 | |
| S11 | Aspherical surface | 15.452 | 4.03 | 1.85,43.00 |
| S12 | Aspherical surface | -30.701 | 2.21 | |
| S13 | Aspherical surface | -7.973 | 0.96 | 1.35,73.39 |
| S14 | Aspherical surface | 28.968 | 1.30 | |
| S15 | Spherical surface | Infinity is provided | 0.80 | 1.49,66.20 |
| S16 | Spherical surface | Infinity is provided | 1.89 | |
| S17 | Spherical surface | Infinity is provided |
In table 1, the object side surface and the image side surface of any one of the third lens E3 and the sixth lens E6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula. The cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14 and a16 for each of the aspherical surfaces usable in example 1 are given in table 2.
Table 2: example 1 aspherical correlation value of lens surface
| Face number | K | A4 | A6 | A8 | A10 | A12 |
| 6 | -3.06E+00 | -8.98E-05 | -2.36E-06 | 1.56E-09 | -8.77E-10 | 0 |
| 7 | 14.40E+00 | -1.49E-04 | -1.70E-06 | -1.57E-08 | -8.04E-11 | 0 |
| 11 | 2.57E+00 | -1.87E-04 | -3.37E-06 | -1.01E-08 | -8.95E-12 | -3.61E-11 |
| 12 | -198.19E+00 | -2.96E-04 | 5.51E-06 | -1.42E-07 | -2.15E-09 | 4.72E-11 |
Fig. 2 shows astigmatism and distortion curves of the optical imaging lens of embodiment 1. Astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights.
Fig. 3 shows a relative illuminance curve of the optical imaging lens of embodiment 1, which represents a ratio of illuminance at different coordinate points of an image plane to illuminance at a center point.
Fig. 4 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. As can be seen from fig. 1 to 4, the optical imaging lens provided in embodiment 1 can achieve good imaging quality, and a high-performance design is achieved.
Specifically, as a preferred embodiment of the present invention, without limitation, an optical imaging lens of example 2 of the present application is described with reference to fig. 5 to 8, and as shown in fig. 5, the optical imaging lens according to the exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an optical filter E8, and an imaging surface S16 in order from an object plane to an image plane along an optical axis.
The effective focal length f of the optical system, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S16, and half of the ImgH of the imaging surface in the horizontal direction of the effective pixel area satisfy: f/TTL imgh= 1.995, the radius of curvature R22 of the image side surface S4 and the radius of curvature of the object side surface S3 of the second lens element E2 satisfy |r22/r21|=3.54, and the distance TTL between the center of the object side surface S1 of the first lens element E1 and the imaging surface S16 of the optical lens on the optical axis and the focal length f of the optical lens satisfy: TTL/f= 2.021, the radius of curvature R71 of the object-side surface S12 and the radius of curvature R72 of the image-side surface S13 of the seventh lens element E7 satisfy: r71/r72|=0.35.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave; the second lens E2 has positive focal power, and an object side surface S3 of the second lens is a convex surface; the third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex; the fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex; the fifth lens element E5 has negative refractive power, wherein an object-side surface S8 thereof is concave, and an image-side surface S9 thereof is concave; the sixth lens element E6 has positive refractive power, wherein an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is convex; the seventh lens element E7 has negative refractive power, and the object-side surface S12 thereof is concave. The fifth lens element E5 and the sixth lens element E6 are cemented lenses. The filter E8 has an object side surface S14 and an image side surface S15. Light from the object sequentially passes through the respective surfaces S1 to S15 and is finally imaged on the imaging surface S16.
Table 3 shows the surface types, the radii of curvature, the thicknesses, and the materials of the respective lenses of the optical imaging lens of example 2, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 3: example 2 basic parameters of an optical System
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | Infinity is provided | |
| S1 | Spherical surface | -18.068 | 1.75 | 1.66,33.16 |
| S2 | Spherical surface | 18.068 | 0.18 | |
| S3 | Spherical surface | 16.949 | 3.28 | 1.81,23.79 |
| S4 | Spherical surface | -60.051 | 0.00 | |
| STO | Spherical surface | Infinity | 0.36 | |
| S6 | Aspherical surface | 17.765 | 4.62 | 1.65,64.82 |
| S7 | Aspherical surface | -41.371 | 0.10 | |
| S8 | Spherical surface | 29.793 | 4.23 | 1.55,69.34 |
| S9 | Spherical surface | -11.148 | 1.16 | 1.75,25.62 |
| S10 | Aspherical surface | 42.581 | 3.40 | |
| S11 | Aspherical surface | 13.892 | 4.47 | 1.74,48.59 |
| S12 | Aspherical surface | -41.244 | 3.05 | |
| S13 | Aspherical surface | -8.349 | 0.87 | 1.43,70.44 |
| S14 | Aspherical surface | 23.819 | 2.70 | |
| S15 | Spherical surface | Infinity is provided | 0.80 | 1.50,65.20 |
| S16 | Spherical surface | Infinity is provided | 0.03 | |
| S17 | Spherical surface | Infinity is provided |
In table 3, the object side surface and the image side surface of either the third lens element E3 or the sixth lens element E6 are aspherical surfaces, and the surface shape of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:
wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula. The cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14 and a16 for each of the aspherical surfaces usable in example 2 are given in table 4.
Table 4: example 2 aspherical correlation values of lens surfaces
| Face number | K | A4 | A6 | A8 | A10 | A12 |
| 6 | -3.06E+00 | -8.98E-05 | -2.36E-06 | 1.56E-09 | -8.77E-10 | 0 |
| 7 | 14.40E+00 | -1.49E-04 | -1.70E-06 | -1.57E-08 | -8.04E-11 | 0 |
| 11 | 2.57E+00 | -1.87E-04 | -3.37E-06 | -1.01E-08 | -8.95E-12 | -3.61E-11 |
| 12 | -198.19E+00 | -2.96E-04 | 5.51E-06 | -1.42E-07 | -2.15E-09 | 4.72E-11 |
Fig. 6 shows astigmatism and distortion curves of the optical imaging lens of embodiment 2. Astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights.
Fig. 7 shows a relative illuminance curve of the optical imaging lens of embodiment 2, which represents a ratio of illuminance at different coordinate points of an image plane to illuminance at a center point.
Fig. 8 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. It can be seen from fig. 5 to 8 that the optical imaging lens provided in embodiment 2 can achieve good imaging quality, and a high-performance design is achieved.
The imaging module at least comprises an optical lens, wherein the low-distortion vehicle-mounted front-view optical system is arranged in the optical lens, the optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane along an optical axis, the surface type and focal power of each lens are reasonably distributed, and the spherical and aspheric hybrid optical system is used for improving the recognition of the optical system on a far object in front and simultaneously taking advantages of low distortion, high resolution, excellent temperature characteristics, ultrahigh pixels and the like, so that the imaging module has huge potential in the vehicle-mounted front-view field.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a low distortion on-vehicle forward vision optical system, constitutes its characterized in that by first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens along the optical axis from the object plane to the image plane in proper order:
the first lens has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, and the object side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens element has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface;
the optical system satisfies the following relationship:
1.20＜f/TTL*ImgH＜3.50；
wherein f is the effective focal length of the optical system, TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and ImgH is half of the length of the effective pixel area on the imaging surface in the horizontal direction.
2. The low-distortion vehicle-mounted front-view optical system according to claim 1, wherein the optical system satisfies the following condition:
-25.0mm＜f1＜-8.0mm；
8.0mm＜f2＜30.0mm；
15.5mm＜f3＜25.5mm；
5.0mm＜f4＜20.5mm；
-18.0mm＜f5＜-5.5mm；
19.5mm＜f6＜14.5mm；
-90.0mm＜f56＜-65.0mm；
-20.0mm＜f7＜-12.0mm；
wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f56 is the focal length of the cemented lens of the fifth lens and the sixth lens, and f7 is the focal length of the seventh lens.
3. The low-distortion vehicle-mounted front-view optical system according to claim 1, wherein the optical system satisfies the following condition:
-3.0＜f1/f＜-0.8；
1.0＜f2/f＜5.5；
0.9＜f3/f＜3.0；
4.5＜f4/f＜10.5；
-1.5＜f5/f＜-0.2；
-2.5＜f6/f＜-0.8；
-7.5＜f56/f＜-2.5；
-1.2＜f7/f＜-0.3；
wherein f is an effective focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f56 is a focal length of a cemented lens combining the fifth lens and the sixth lens, and f7 is a focal length of the seventh lens.
4. A low distortion vehicle front vision optical system as set forth in any of claims 1-3, wherein the second lens has an image side radius of curvature R22 and an object side radius of curvature R21 that satisfy: R22/R21 is more than or equal to 3.
5. A low distortion vehicle front vision optical system as set forth in any one of claims 1-3, characterized in that the optical system satisfies the following condition: the object-side radius of curvature R71 and the image-side radius of curvature R72 of the seventh lens satisfy: R71/R72 is more than or equal to 0.2 and less than or equal to 0.45.
6. A low distortion vehicle mounted front vision optical system as claimed in any one of claims 1-3, wherein the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis is TTL and the focal length value f of the optical lens satisfies: TTL/f is less than or equal to 5.
7. A low-distortion vehicle-mounted front-view optical system according to any one of claims 1 to 3, wherein the material refractive index Nd1, the material abbe number constant Vd1 of the first lens satisfy: nd1 is more than 1.65 and less than 2.00, vd1 is more than 20.00 and less than 60.00;
the refractive index Nd2 of the material of the second lens and the abbe number constant Vd2 of the material satisfy: nd2 is more than 1.75 and less than 2.00, vd2 is more than 18.00 and less than 30.00;
the refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens satisfy: nd3 is more than 1.55 and less than 1.67, vd3 is more than 52.00 and less than 65.00;
the material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens satisfy: nd4 is more than 1.43 and less than 1.63, vd4 is more than 61.00 and less than 95.00;
the refractive index Nd5 of the material and the abbe number constant Vd5 of the fifth lens satisfy: nd5 is more than 1.45 and less than 1.95, vd5 is more than 15.00 and less than 35.00;
the refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens satisfy: nd6 is more than 1.67 and less than 1.80, vd6 is more than 27.00 and less than 50.00;
the refractive index Nd7 of the material and the abbe number constant Vd7 of the seventh lens satisfy: nd7 is more than 1.45 and less than 1.50, vd7 is more than 62.00 and less than 75.00.
8. A low distortion vehicle mounted front view optical system according to any of claims 1-3, wherein the full field angle FOV of the optical system satisfies: 25.00 < FOV < 36.00.
9. A low distortion vehicle front vision optical system as set forth in any one of claims 1-3, characterized in that the optical system satisfies the following condition: the fifth lens and the sixth lens form a cemented lens.
10. An imaging module comprising at least an optical lens, wherein the low-distortion vehicle-mounted front-view optical system as claimed in any one of claims 1 to 9 is installed in the optical lens.
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