CN221613109U - Wide-angle high-pixel vehicle-mounted optical system and camera module applying same - Google Patents
Wide-angle high-pixel vehicle-mounted optical system and camera module applying same Download PDFInfo
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Abstract
The utility model provides a wide-angle and high-pixel vehicle-mounted 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, and the spherical and aspheric hybrid optical system is used by reasonably distributing the surface type and focal power of each lens, and meanwhile, the advantages of wide-angle and high-definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are simultaneously considered, so that the wide-angle and high-definition vehicle-mounted optical system has huge potential in the vehicle-mounted field.
Description
Technical Field
The application relates to the field of optical imaging, in particular to a wide-angle and high-pixel vehicle-mounted optical system and an imaging module applied to the same.
Background
With the popularization of optical systems, there is a demand for not only imaging sharpness and miniaturization but also a demand for satisfying a large angle of view and obtaining a larger amount of optical information. The currently applied optical system has lower pixels and smaller field angle, so that the field angle of the optical system is increased and the visible range of a user is increased while the high pixels are realized, and the characteristic is extremely important to the safety of the user and has larger competitiveness in the market.
Disclosure of utility model
In order to overcome the defects of low pixels and small field angle commonly existing in the existing vehicle-mounted optical lens, the application provides an optical system with wide angle and high definition, excellent temperature characteristics and ultra-high pixels and an imaging module applied to the optical system, and the optical system uses a spherical and aspheric hybrid optical system, combines the characteristics of the wide angle and high definition, excellent temperature characteristics and ultra-high pixels, and has huge potential in the market.
The utility model provides a wide angle, on-vehicle optical system of high pixel, includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens in proper order from object plane to image plane along the optical axis, its characterized in that:
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
The second lens has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface;
The third lens has positive focal power, and the object 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 plane;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface;
the seventh lens has positive focal power, wherein an object side surface of the seventh lens is a convex surface, and an image side surface of the seventh lens is a convex surface.
A wide-angle, high-pixel in-vehicle optical system as described above, which satisfies the following relationship: 0.20
＜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.
A wide-angle, high-pixel in-vehicle optical system as described above, which satisfies the following conditions:
-12.0mm＜f1＜-2.5mm；
-25.0mm＜f2＜-9.5mm；
8.0mm＜f3＜20.0mm；
11.0mm＜f4＜23.0mm；
1.5mm＜f5＜8.0mm；
-15.0mm＜f6＜-2.0mm；
6.5mm＜f56＜20.5mm；
18.0mm＜f7＜30.0mm；
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.
A wide-angle, high-pixel in-vehicle optical system as described above, which satisfies the following conditions:
-3.5＜f1/f＜-0.5；
-8.0＜f2/f＜-2.5；
4.0＜f3/f＜9.0；
3.0＜f4/f＜12.0；
1.2＜f5/f＜5.0；
-5.5＜f6/f＜-0.5；
2.1＜f56/f＜7.6；
4.0＜f7/f＜15.0；
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.
As described above, the wide-angle, high-pixel in-vehicle optical system, the object-side radius of curvature R31 and the image-side radius of curvature R32 of the third lens satisfy: R31/R32 is more than or equal to 0.50.
As described above, in the wide-angle, high-pixel vehicle-mounted optical system, 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 8.
As described above, the wide-angle, high-pixel in-vehicle optical system, the material refractive index Nd1, the material abbe number constant Vd1 of the first lens satisfy: nd1 is more than 1.63 and less than 2.01, vd1 is more than 25.00 and less than 61.00;
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 1.49 and less than 2.01, vd2 is more than 20.00 and less than 82.00;
The refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens satisfy: nd3 is more than 1.60 and less than 1.97, vd3 is more than 17.00 and less than 55.00;
The material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens satisfy: nd4 is more than 1.40 and less than 1.66, vd4 is more than 50.00 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 1.40 and less than 1.66, vd5 is more than 50.00 and less than 95.00;
The refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens satisfy: nd6 is more than 1.65 and less than 2.05, vd6 is more than 15.00 and less than 35.00;
The refractive index Nd7 of the material and the abbe number constant Vd7 of the seventh lens satisfy: nd7 is more than 1.49 and less than 2.01, vd7 is more than 20.00 and less than 82.00.
The wide-angle, high-pixel in-vehicle optical system as described above, the full field angle FOV of which satisfies: 140 DEG < FOV < 180 deg.
The wide-angle, high-pixel in-vehicle optical system as described above, the fifth lens and the sixth lens form a cemented lens.
As described above, the wide-angle, high-pixel in-vehicle optical system, the object-side radius of curvature R61 and the image-side radius of curvature R62 of the sixth lens satisfy: R61/R62 is more than or equal to 0.20.
On the other hand, the embodiment of the application also provides an image pickup module, which at least comprises an optical lens, wherein the wide-angle and high-pixel vehicle-mounted optical system is arranged in the optical lens.
Compared with the prior art, the application has the following beneficial effects:
The wide-angle and high-pixel vehicle-mounted optical system and the imaging module applied to the same provided by the embodiment of the utility model have the advantages of wide-angle and high-definition resolution, excellent temperature characteristics, ultrahigh pixels and the like, and have great potential in the vehicle-mounted field by reasonably distributing the surface type and focal power of each lens and using a spherical and aspherical hybrid optical system.
Drawings
In order to more clearly illustrate the technical solutions of 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 an optical system or an image capturing module according to embodiment 1 of the present application;
FIG. 2 is a graph showing the relative illuminance of an optical system or camera module according to embodiment 1 of the present application;
FIG. 3 is an astigmatism and distortion curve of an optical system or camera module according to embodiment 1 of the present application;
FIG. 4 is an on-axis chromatic aberration curve of an optical system or camera module according to embodiment 1 of the present application;
Fig. 5 is a schematic structural diagram of an optical system or an image capturing module according to embodiment 2 of the present application;
FIG. 6 is a graph showing the relative illuminance of an optical system or camera module according to embodiment 2 of the present application;
FIG. 7 is an astigmatism and distortion curve of an optical system or camera module according to embodiment 2 of the present application;
Fig. 8 is an on-axis chromatic aberration curve of the optical system or the camera module according to embodiment 2 of the present application.
Detailed Description
As shown in fig. 1-8, the present application provides a wide-angle, high-pixel vehicle-mounted optical system and an image capturing module thereof, where the optical system sequentially includes, along an optical axis, 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;
the first lens element E1 has negative refractive power, a convex object-side surface and a concave image-side surface;
the second lens element E2 has negative refractive power, a concave object-side surface and a convex image-side surface;
the third lens E3 has positive focal power, and the object side surface of the third lens E3 is a convex 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 planar;
The fifth lens element E5 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
The sixth lens E6 has negative focal power, and the object side surface of the sixth lens is a concave surface;
the seventh lens element E7 with positive refractive power has a convex object-side surface and a convex image-side surface;
the fifth lens E5 and the sixth lens E6 form a cemented lens.
According to the wide-angle and high-pixel vehicle-mounted optical system and the imaging module applied to the same, 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, and the spherical and aspherical mixed optical system is used by reasonably distributing the surface type and the focal power of each lens, meanwhile, the advantages of wide-angle and high-definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are considered, and the wide-angle and high-definition vehicle-mounted optical system has huge potential in the vehicle-mounted field.
Further, the optical system satisfies the following relationship: 0.20 < f/TTL < ImgH < 3.50; where f is the effective focal length of the optical system, TTL is the distance 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 ImgH is half of the length of the effective pixel area on the imaging surface in the horizontal direction. The relation reflects the constraint condition of the optical lens on the view angle and the light and thin characteristics, and when the relation is satisfied, the requirement on the light and thin property of the optical lens can be met on the basis of the satisfaction of the optical lens.
Further, the optical system satisfies the following condition ：-12.0mm＜f1＜-2.5mm;-25.0mm＜f2＜-9.5mm;8.0mm＜f3＜20.0mm;11.0mm＜f4＜23.0mm;1.5mm＜f5＜8.0mm;-15.0mm＜f6＜-2.0mm;6.5mm＜f56＜20.5mm;18.0mm＜f7＜30.0mm;, 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. Through the focal length of each lens of rational distribution, have the advantage of high resolution simultaneously, when reducing the volume, compromise advantages such as visual angle definition height.
Further, the optical system satisfies the following condition:
-3.5 < f1/f < -0.5, 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;
-8.0 < f2/f < -2.5, optimizing lens aberration by restricting the effective focal length ratio of the second lens E2 to the optical system in a reasonable range, and improving imaging quality;
4.0 < f3/f < 9.0, and fine adjustment and control are carried out on the spherical aberration of the system by restricting the effective focal length ratio of the third lens E3 to the optical system in a reasonable range, so that the imaging quality of the system is effectively improved;
3.0 < f4/f < 12.0, and 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;
F5/f is more than 1.2 and less than 5.0, and the imaging quality is improved by restraining the optical power of the fifth lens E5 and the effective focal length ratio of the optical system in a reasonable range;
-5.5 < f6/f < -0.5, 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;
2.1 < f56/f < 7.6, 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 power of the sixth lens E6 can be properly distributed, the balance of the internal aberration of the optical lens is realized, the field curvature and the astigmatism of the imaging edge of the optical lens can be adjusted, and the imaging quality of the optical lens to the surrounding environment can be met;
4.0 < f7/f < 15.0, 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;
Wherein f is an effective focal length of the optical system, 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.
Further, the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens satisfy: the R31/R32 is more than or equal to 0.50, which is favorable for increasing the aperture of the rear diaphragm and increasing the light quantity of the system.
Further, a 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 a focal length value f of the optical lens satisfy: TTL/f is less than or equal to 8, the size of the system can be effectively compressed, and the characteristic of large wide angle is realized.
Further, the refractive index Nd1 of the material and the abbe number constant Vd1 of the first lens E1 satisfy: nd1 is more than 1 and less than 2.01, vd1 is more than 25.00 and less than 61.00, the design can effectively improve distortion, optimize lens aberration, and further effectively improve imaging quality of a system;
The refractive index Nd2 of the material of the second lens E2 and the abbe number constant Vd2 of the material satisfy: nd2 is more than 1.49 and less than 2.01, vd2 is more than 20.00 and less than 82.00, the design can effectively improve distortion, optimize lens aberration, and further effectively improve imaging quality of a system;
The refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens E3 satisfy: nd3 is more than 1.60 and less than 1.97, vd3 is more than 17.00 and less than 55.00, the design can effectively improve distortion, ensure good optical performance, further ensure viewing angle and improve the function of resolution of a lens;
The material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens E4 satisfy: nd4 is more than 1.40 and less than 1.66, vd4 is more than 50.00 and less than 95.00, the design can effectively improve distortion, ensure good optical performance, further ensure viewing angle and improve the function of resolution of a lens;
The refractive index Nd5 of the material and the abbe number constant Vd5 of the fifth lens E5 satisfy: nd5 is more than 1.40 and less than 1.66, vd5 is more than 50.00 and less than 95.00, distortion and field curvature can be effectively improved, good optical performance is ensured, a visual angle is further ensured, and the analytic function of a lens is improved;
The refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens E6 satisfy: nd6 is more than 1.65 and less than 2.05, vd6 is more than 15.00 and less than 35.00, the design can effectively improve distortion and field curvature, optimize lens aberration, and further effectively improve imaging quality of a system;
The material refractive index Nd7 and the material abbe number constant Vd7 of the seventh lens E7 satisfy: nd7 is more than 1.49 and less than 2.01, vd7 is more than 20.00 and less than 82.00, the design can effectively improve astigmatism, optimize lens aberration, and further effectively improve imaging quality of a system.
Further, the full field angle FOV of the optical system satisfies: the design meets the requirement of large field angle of the lens, and the optical system provided by the utility model has the advantages of wide angle, high definition, excellent temperature characteristic and ultra-high pixel, and is compact in structure, convenient to process and install and good in imaging resolution.
Further, the fifth lens E5 and the sixth lens E6 form a cemented lens, and first, the cemented lens is helpful for eliminating chromatic aberration, reducing curvature of field, 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; fourth, tolerance sensitivity such as tilting/decentering generated during assembly of the lens units is reduced.
Further, the curvature radius R61 of the object side surface and the curvature radius R62 of the image side surface of the sixth lens satisfy: the R61/R62 is more than or equal to 0.20, the total deflection angle of the object side surface and the image side surface of the sixth lens at the edge view field can be reasonably controlled within a reasonable range by controlling the curvature radius of the object side surface and the image side surface of the sixth lens, the sensitivity of the system can be effectively reduced, and the resolution of the lens is improved.
Example 1:
Specifically, as a preferred embodiment of the present utility model, without limitation, an optical system of example 1 of the present utility model is described below with reference to fig. 1 to 4, and as shown in fig. 1, the optical system according to an exemplary embodiment of the present utility model 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=0.607, the radius of curvature R31 of the object-side surface S5 and the radius of curvature R32 of the image-side surface S6 of the third 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=7.62, the radius of curvature R61 of the object-side surface S10 and the radius of curvature R62 of the image-side surface S11 of the sixth lens element E6 satisfy: r61/r62|=0.30.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens E3 has positive focal power, and an object side surface S5 of the third lens is a convex surface; 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 planar; the fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex; the sixth lens element E6 has negative focal power, and an object-side surface S10 thereof is concave; the seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. 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.
[4] Table 1 shows the surface types, the radii of curvature, the thicknesses, and the materials of the respective lenses of the optical system of example 1, in which the unit of the radii of curvature and the thicknesses is millimeter (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 | 19.318 | 1.30 | 1.91,35.25 |
| S2 | Spherical surface | 4.540 | 4.90 | |
| S3 | Aspherical surface | -5.230 | 3.95 | 1.81,50.00 |
| S4 | Aspherical surface | -10.016 | 0.08 | |
| S5 | Spherical surface | 9.170 | 3.00 | 1.85,23.75 |
| S6 | Spherical surface | 14.770 | 0.12 | |
| S7 | Stop | Infinity | 0.08 | |
| S8 | Spherical surface | 10.570 | 2.75 | 1.62,63.40 |
| STO | Spherical surface | Infinity | 0.04 | |
| S10 | Spherical surface | 9.065 | 5.50 | 1.62,63.40 |
| S11 | Spherical surface | -4.710 | 0.68 | 2.00,19.30 |
| S12 | Spherical surface | -15.663 | 1.00 | |
| S13 | Aspherical surface | 33.988 | 1.17 | 1.81,50.00 |
| S14 | Aspherical surface | -35.745 | 3.00 | |
| S15 | Spherical surface | Infinity | 0.80 | 1.52,64.20 |
| S16 | Spherical surface | Infinity | 2.13 | |
| S17 | Spherical surface | Infinity |
In table 1, the object side surface and the image side surface of any one of the second lens E2 and the seventh lens E7 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 | 3 | 4 | 13 | 14 |
| K | -1.30E+00 | -1.50E+00 | 1.54E+01 | 6.70E+01 |
| A4 | 4.40E-05 | 2.47E-04 | -1.60E-03 | -7.35E-04 |
| A6 | 4.40E-06 | 5.60E-06 | -7.35E-06 | 6.77E-06 |
| A8 | 2.10E-07 | -8.00E-08 | 1.40E-06 | 5.20E-07 |
| A10 | -1.50E-08 | 2.97E-09 | -2.97E-09 | 1.14E-07 |
| A12 | 0 | 0 | 1.88E-09 | 2.23E-09 |
| A14 | 0 | 0 | 8.79E-10 | -1.30E-10 |
| A16 | 0 | 0 | -4.34E-11 | 5.60E-12 |
Fig. 2 shows a relative illuminance curve of the optical system of embodiment 1, which represents the ratio of the illuminance at different coordinate points of the image plane to the illuminance at the center point.
Fig. 3 shows astigmatism and distortion curves of the optical system of example 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. 4 shows an on-axis chromatic aberration curve of the optical system of embodiment 1, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. It can be seen from fig. 1 to 4 that the optical system given in embodiment 1 can achieve good imaging quality, achieving a high-performance design.
Example 2:
Specifically, as a preferred embodiment of the present utility model, without limitation, an optical system of example 2 of the present utility model is described below with reference to fig. 5 to 8, and as shown in fig. 5, the optical system according to an exemplary embodiment of the present utility model 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=0.616, the radius of curvature R31 of the object-side surface S5 and the radius of curvature R32 of the image-side surface S6 of the third 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=7.51, the radius of curvature R61 of the object-side surface S10 and the radius of curvature R62 of the image-side surface S11 of the sixth lens element E6 satisfy: r61/r62|=0.29.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex; the third lens E3 has positive focal power, and an object side surface S5 of the third lens is a convex surface; 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 planar; the fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex; the sixth lens element E6 has negative focal power, and an object-side surface S10 thereof is concave; the seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. 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 3 shows the surface types, the radii of curvature, the thicknesses, and the materials of the respective lenses of the optical system of example 2, in which the unit of the radii of curvature and the thicknesses is millimeter (mm).
Table 3: example 2 basic parameters of an optical System
In table 3, the object side surface and the image side surface of either the second lens E2 or the seventh lens E7 are aspherical, 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 2 are given in table 2.
Table 4: example 2 aspherical correlation values of lens surfaces
| Face number | 3 | 4 | 13 | 14 |
| K | -9.00E-01 | -1.85E+00 | -2.62E+01 | -1.02E+02 |
| A4 | 4.50E-04 | 2.70E-04 | -1.40E-03 | -7.05E-04 |
| A6 | 5.50E-06 | 6.15E-06 | -8.50E-06 | 2.30E-05 |
| A8 | -7.60E-08 | -1.10E-07 | 1.14E-06 | -1.85E-06 |
| A10 | -6.70E-09 | 4.14E-09 | 9.17E-08 | 2.65E-07 |
| A12 | 0 | 0 | -1.06E-08 | -1.30E-09 |
| A14 | 0 | 0 | 1.33E-09 | -4.02E-10 |
| A16 | 0 | 0 | -4.50E-11 | 1.80E-11 |
Fig. 6 shows a relative illuminance curve of the optical system of example 2, which represents the ratio of the illuminance at different coordinate points of the image plane to the illuminance at the center point.
Fig. 7 shows astigmatism and distortion curves of the optical system of example 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. 8 shows an on-axis chromatic aberration curve of the optical system of embodiment 2, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. It can be seen from fig. 5 to 8 that the optical system according to the embodiment can achieve good imaging quality and high performance design.
The utility model provides a module of making a video recording, at least, include the optical lens, install foretell wide angle, the on-vehicle optical system of high pixel in the optical lens, optical system includes first lens in proper order, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, through carrying out the reasonable distribution of face type and focal power to each lens, use sphere and aspherical hybrid optical system, compromise simultaneously that big light ring, high definition's resolution, temperature characteristic are excellent, advantage such as super high pixel has huge latent energy in on-vehicle optical lens 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 utility model to such description. The method, structure, etc. similar to or identical to those of the present utility model, 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 utility model.
Claims (10)
1. The utility model provides a wide angle, on-vehicle optical system of high pixel, includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens in proper order from object plane to image plane along the optical axis, its characterized in that:
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
The second lens has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface;
The third lens has positive focal power, and the object 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 plane;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface;
the seventh lens has positive focal power, wherein an object side surface of the seventh lens is a convex surface, and an image side surface of the seventh lens is a convex surface.
2. The wide-angle, high-pixel in-vehicle optical system according to claim 1, wherein: the optical system satisfies the following conditions:
-12.0mm＜f1＜-2.5mm；
-25.0mm＜f2＜-9.5mm；
8.0mm＜f3＜20.0mm；
11.0mm＜f4＜23.0mm；
1.5mm＜f5＜8.0mm；
-15.0mm＜f6＜-2.0mm；
6.5mm＜f56＜20.5mm；
18.0mm＜f7＜30.0mm；
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 wide-angle, high-pixel in-vehicle optical system according to claim 1, wherein: the optical system satisfies the following conditions:
-3.5＜f1/f＜-0.5；
-8.0＜f2/f＜-2.5；
4.0＜f3/f＜9.0；
3.0＜f4/f＜12.0；
1.2＜f5/f＜5.0；
-5.5＜f6/f＜-0.5；
2.1＜f56/f＜7.6；
4.0＜f7/f＜15.0；
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 wide-angle, high-pixel in-vehicle optical system according to any one of claims 1-3, wherein: the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens satisfy the following conditions: R31/R32 is more than or equal to 0.50.
5. A wide-angle, high-pixel in-vehicle optical system according to 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 is as follows: TTL/f is less than or equal to 8.
6. A wide-angle, high-pixel in-vehicle optical system according to any one of claims 1-3, wherein: the refractive index Nd1 of the material of the first lens and the Abbe number constant Vd1 of the material satisfy the following conditions: nd1 is more than 1.63 and less than 2.01, vd1 is more than 25.00 and less than 61.00;
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 1.49 and less than 2.01, vd2 is more than 20.00 and less than 82.00;
The refractive index Nd3 of the material and the abbe number constant Vd3 of the third lens satisfy: nd3 is more than 1.60 and less than 1.97, vd3 is more than 17.00 and less than 55.00;
The material refractive index Nd4 and the material abbe number constant Vd4 of the fourth lens satisfy: nd4 is more than 1.40 and less than 1.66, vd4 is more than 50.00 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 1.40 and less than 1.66, vd5 is more than 50.00 and less than 95.00;
The refractive index Nd6 of the material and the abbe number constant Vd6 of the sixth lens satisfy: nd6 is more than 1.65 and less than 2.05, vd6 is more than 15.00 and less than 35.00;
The refractive index Nd7 of the material and the abbe number constant Vd7 of the seventh lens satisfy: nd7 is more than 1.49 and less than 2.01, vd7 is more than 20.00 and less than 82.00.
7. A wide-angle, high-pixel in-vehicle optical system according to any one of claims 1-3, wherein: the full field angle FOV of this optical system satisfies: 140 DEG < FOV < 180 deg.
8. A wide-angle, high-pixel in-vehicle optical system according to any one of claims 1-3, wherein: the optical system satisfies the following relationship: 0.20 < 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.
9. A wide-angle, high-pixel in-vehicle optical system according to any one of claims 1-3, wherein: the curvature radius R61 of the object side surface and the curvature radius R62 of the image side surface of the sixth lens satisfy the following conditions: R61/R62 is more than or equal to 0.20.
10. An imaging module at least comprising an optical lens, wherein the wide-angle, high-pixel vehicle-mounted optical system as claimed in any one of claims 1 to 9 is installed in the optical lens.
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