CN117452609A - Large-aperture vehicle-mounted optical system and camera module applying same - Google Patents
Large-aperture vehicle-mounted optical system and camera module applying same Download PDFInfo
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention provides a large aperture 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 aspherical hybrid optical system is used by reasonably distributing the surface type and focal power of each lens, and meanwhile, the advantages of large aperture, high resolution, excellent temperature characteristics, ultrahigh pixels and the like are taken into account, so that the large aperture vehicle-mounted optical system has great potential in the field of vehicle-mounted optical lenses.
Description
Technical Field
The application relates to the field of optical imaging, in particular to a large-aperture vehicle-mounted optical system and a camera module applied to the same.
Background
In recent years, automobile auxiliary driving systems are rapidly developed, and vehicle-mounted optical lenses play an irreplaceable role as eyes for automobiles to acquire external information. In order to meet the requirements of higher imaging quality and larger visual range, the lenses are required to be reasonably matched and a larger aperture is required to be used, however, most lenses in the market at present have the defects of small aperture, low resolution, low pixels and the like.
Disclosure of Invention
In order to overcome the defects of small aperture, low resolution and low pixel of the existing vehicle-mounted optical lens, the application provides an optical system with large aperture, high resolution and high temperature characteristic and ultra-high pixel and a camera module applied to the optical system, and has the characteristics of large aperture, high resolution and high temperature characteristic and ultra-high pixel, and has huge potential in the vehicle-mounted field.
The large-aperture vehicle-mounted 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 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, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface;
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.
The large aperture in-vehicle optical system as described above satisfies the following relationship: 0.50 < f/TTL < ImgH < 2.50;
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.
The large aperture vehicle-mounted optical system as described above satisfies the following conditions:
-8.0mm＜f1＜-4.0mm；-45.0mm＜f2＜-30.0mm；20.0mm＜f3＜40.0mm；10.0mm＜f4＜25.0mm；10.0mm＜f34＜20.0mm；1.0mm＜f5＜10.0mm；-15.0mm＜f6＜-2.0mm；5.0mm＜f56＜20.0mm；10.0mm＜f7＜25.0mm；
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, f34 is the focal length of the cemented lens of the third lens and 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.
The large aperture vehicle-mounted optical system as described above satisfies the following conditions:
-2.5＜f1/f＜-0.5；-10.0＜f2/f＜-3.5；2.0＜f3/f＜15.0；3.0＜f4/f＜9.0；2.5＜f34/f＜12.0；0.5＜f5/f＜6.0；-2.0＜f6/f＜0.5；-5.0＜f56/f＜-1.0；-3.0＜f7/f＜-0.1；
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, f34 is a focal length of a cemented lens combining the third lens and 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.
In the large aperture 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 large aperture vehicle-mounted optical system has a material refractive index Nd1 and a material abbe number constant Vd1 of the first lens that 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 large aperture in-vehicle optical system as described above, the full field angle FOV of the optical system satisfies: 140.00 DEG < FOV < 180.00 deg.
As described above, the large aperture on-vehicle optical system satisfies the relationship between the radius R61 of curvature of the object side surface and the radius R62 of curvature of the image side surface of the sixth lens: R61/R62 is more than or equal to 0.15.
In the large-aperture vehicle-mounted optical system described above, the third lens and the fourth lens form a cemented lens, and the fifth lens and the sixth lens form a cemented lens.
The large aperture vehicle-mounted optical system as described above further includes a stop provided between the fourth lens and the fifth 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 large-aperture vehicle-mounted optical system is arranged in the optical lens.
Compared with the prior art, the beneficial effects of the application are as follows:
the large aperture vehicle-mounted optical system and the imaging module applied to the same provided by the embodiment of the invention are characterized in that the optical system is sequentially composed of 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 focal power of each lens, and meanwhile, the advantages of large aperture, high definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are simultaneously considered, so that the large aperture vehicle-mounted optical system has great potential in the field of vehicle-mounted optical lenses.
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 structural 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 of embodiment 1 of the present application;
FIG. 4 is an on-axis chromatic aberration curve of an optical system or camera module of 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 camera module of embodiment 2 of the present application.
Detailed Description
As shown in fig. 1-8, the present application provides a large aperture vehicle-mounted optical system, which 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, and a seventh lens E7 in order from an object plane to an image plane along an optical axis;
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 element E3 has positive refractive power, and has a convex object-side surface and a concave image-side surface;
the fourth lens E4 has positive focal power, and the object side surface of the fourth lens E4 is a convex surface;
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.
According to the large-aperture vehicle-mounted optical system, which is disclosed by the embodiment of the invention, 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 hybrid optical system is used by reasonably distributing the surface type and the focal power of each lens, and meanwhile, the advantages of large aperture, high definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are simultaneously considered, so that the large-aperture vehicle-mounted optical system has great potential in the field of vehicle-mounted optical lenses.
Further, the optical system satisfies the following relationship: 0.50 < f/TTL < ImgH < 2.50; 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: -8.0mm < f1 < -4.0mm; -45.0mm < f2 < -30.0mm; f3 is more than 20.0mm and less than 40.0mm; f4 is more than 10.0mm and less than 25.0mm; f34 is more than 10.0mm and less than 20.0mm; f5 is more than 1.0mm and less than 10.0mm; -15.0mm < f6 < -2.0mm; f56 is more than 5.0mm and less than 20.0mm; f7 is more than 10.0mm and less than 25.0mm; 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, f34 is a focal length of a cemented lens combining the third lens E3 and 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, compromise advantages such as big light ring, visual angle definition height, high pixel.
Further, the optical system satisfies the following condition:
-2.5 < 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;
-10.0 < f2/f < -3.5, 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;
2.0 < f3/f < 15.0, and fine tuning and controlling the spherical aberration of the system are performed 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 < 9.0, 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;
2.5 < f34/f < 12.0, the ratio of the combined focal length of the third lens E3 and the fourth lens E4 to the effective focal length of the optical lens is restrained, so that the focal power of the third lens E3 and the focal power of the fourth lens E4 can be properly distributed, the balance of the internal aberration of the optical lens can be realized, the field curvature and the astigmatism of the imaging edge of the optical lens can be further adjusted, and the imaging quality of the optical lens to the surrounding environment can be met;
f5/f is more than 0.5 and less than 6.0, 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;
-2.0 < f6/f < 0.5, optimizing lens aberration by restricting the effective focal length ratio of the sixth lens E6 to the optical system in a reasonable range, and improving resolution performance;
-5.0 < f56/f < -1.0, by restricting 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, the focal powers of the fifth lens E5 and the sixth lens E6 can be properly distributed, so that the balance of the internal aberration of the optical lens can be realized, the curvature of field and astigmatism of the imaging edge of the optical lens can be further adjusted, and the imaging quality of the optical lens to the surrounding environment can be met;
-3.0 < f7/f < -0.1, 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, 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: 140.00 DEG FOV is smaller than 180.00 DEG, the design meets the requirement of a large field angle of the lens, and the optical system provided by the invention has the advantages of large aperture, high resolution, excellent temperature characteristic and ultrahigh pixel, has a compact structure, is convenient to process and install, and has good imaging resolving power.
Further, the third lens E3 and the fourth lens E4 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, and the compact requirement of the system is met; fourth, tolerance sensitivity such as tilting/decentering generated during assembly of the lens units is reduced.
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, and the compact requirement of the system is met; fourth, tolerance sensitivity such as tilting/decentering generated during assembly of the lens units is reduced.
Further, the radius of curvature R61 of the object-side surface S9 and the radius of curvature R62 of the image-side surface S10 of the sixth lens element E6 satisfy: the R61/R62 is more than or equal to 0.15, 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 resolving power of the lens is improved.
Example 1:
specifically, as a preferred embodiment of the present invention, without limitation, an optical system of example 1 of the present application is described below with reference to fig. 1 to 4, as shown in fig. 1, the optical system 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 stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S15 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 S15, and half of the ImgH of the effective pixel area on the imaging surface in the horizontal direction satisfy: f/TTL imgh=0.612, the distance TTL between the center of the object side surface S1 of the first lens E1 and the imaging surface S15 of the optical lens on the optical axis and the focal length f of the optical lens satisfy: TTL/f=7.6, the radius of curvature R61 of the object-side surface S9 and the radius of curvature R62 of the image-side surface S10 of the sixth lens element E6 satisfy: r61/r62|=0.27.
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 element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave; the fourth lens element E4 has positive refractive power, and an object-side surface S6 thereof is convex; the fifth lens element E5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex; the sixth lens E6 has negative focal power, and an object side surface S9 thereof is a concave surface; the seventh lens element E7 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The third lens element E3 and the fourth lens element E4 are lens elements, and the fifth lens element E5 and the sixth lens element E6 are lens elements. The filter E8 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 1 shows the surface types, the radii of curvature, the thicknesses, and the materials of the respective lenses of the optical imaging 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 | 20.084 | 1.19 | 1.91,35.30 |
| S2 | Spherical surface | 4.453 | 4.96 | |
| S3 | Aspherical surface | -5.305 | 3.60 | 1.81,40.97 |
| S4 | Aspherical surface | -8.605 | 0.22 | |
| S5 | Spherical surface | 9.183 | 4.95 | 1.85,23.79 |
| S6 | Spherical surface | 11.843 | 1.73 | 1.62,63.40 |
| S7 | Spherical surface | 479.693 | 0.02 | |
| STO | Spherical surface | Infinity | 0.13 | |
| S9 | Spherical surface | 7.132 | 4.55 | 1.60,65.46 |
| S10 | Spherical surface | -5.869 | 0.54 | 2.00,19.32 |
| S11 | Spherical surface | -25.188 | 1.00 | |
| S12 | Aspherical surface | 27.068 | 1.50 | 1.81,40.97 |
| S13 | Aspherical surface | -32.015 | 3.00 | |
| S14 | Spherical surface | Infinity | 0.80 | 1.52,64.20 |
| S15 | Spherical surface | Infinity | 2.20 | |
| S16 | 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 the examples are given in table 2.
Table 2: example 1 aspherical correlation value of lens surface
| Face number | 3 | 4 | 12 | 13 |
| K | -1.30E+00 | -2.00E-01 | 3.31E+01 | -1.60E-01 |
| A4 | -2.40E-04 | 2.30E-04 | -1.65E-03 | -5.06E-04 |
| A6 | 3.20E-06 | 4.35E-06 | -3.00E-05 | -2.50E-05 |
| A8 | 7.70E-07 | -9.56E-08 | 2.80E-06 | 3.70E-06 |
| A10 | -4.50E-08 | 9.35E-10 | -3.40E-07 | -1.50E-07 |
| A12 | 0 | 0 | -1.30E-08 | -1.63E-08 |
| A14 | 0 | 0 | 1.40E-09 | 2.60E-09 |
| A16 | 0 | 0 | -7.00E-11 | -8.00E-11 |
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 invention, without limitation, an optical system of example 2 of the present application is described below with reference to fig. 5 to 8, as shown in fig. 5, the optical system according to the exemplary embodiment of the present application sequentially comprising 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 S15 along an optical axis from an object plane to an image plane.
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 S15, and half of the ImgH of the effective pixel area on the imaging surface in the horizontal direction satisfy: f/TTL imgh=0.605, the distance TTL between the center of the object side surface S1 of the first lens E1 and the imaging surface S15 of the optical lens on the optical axis and the focal length f of the optical lens satisfy: TTL/f=8.0, the radius of curvature R61 of the object-side surface S9 and the radius of curvature R62 of the image-side surface S10 of the sixth lens element E6 satisfy: r61/r62|=0.23.
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 element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave; the fourth lens element E4 has positive refractive power, and an object-side surface S6 thereof is convex; the fifth lens element E5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex; the sixth lens E6 has negative focal power, and an object side surface S9 thereof is a concave surface; the seventh lens element E7 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The third lens element E3 and the fourth lens element E4 are lens elements, and the fifth lens element E5 and the sixth lens element E6 are lens elements. The filter E8 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
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
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | Infinity is provided | |
| S1 | Spherical surface | 20.512 | 1.25 | 1.91,35.30 |
| S2 | Spherical surface | 4.413 | 4.73 | |
| S3 | Aspherical surface | -5.308 | 3.60 | 1.81,40.97 |
| S4 | Aspherical surface | -8.573 | 0.22 | |
| S5 | Spherical surface | 9.183 | 4.95 | 1.85,23.79 |
| S6 | Spherical surface | 11.625 | 2.20 | 1.62,63.40 |
| S7 | Spherical surface | Infinity | 0.02 | |
| STO | Spherical surface | Infinity | 0.13 | |
| S9 | Spherical surface | 7.075 | 4.47 | 1.60,65.46 |
| S10 | Spherical surface | -5.825 | 0.70 | 2.00,19.32 |
| S11 | Spherical surface | -25.378 | 0.98 | |
| S12 | Aspherical surface | 26.148 | 1.47 | 1.81,40.97 |
| S13 | Aspherical surface | -32.037 | 2.50 | |
| S14 | Spherical surface | Infinity | 0.80 | 1.52,64.20 |
| S15 | Spherical surface | Infinity | 2.65 | |
| S16 | Spherical surface | Infinity |
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 the examples are given in table 4.
Table 4: example 2 aspherical correlation values of lens surfaces
| Face number | 3 | 4 | 12 | 13 |
| K | -1.30E+00 | -2.00E-01 | 3.65E+01 | -2.00E-02 |
| A4 | -2.40E-04 | 2.30E-04 | -1.70E-03 | -5.10E-04 |
| A6 | 3.10E-06 | 4.90E-06 | -3.36E-05 | -3.20E-05 |
| A8 | 1.30E-07 | -1.30E-07 | 3.20E-06 | 4.40E-06 |
| A10 | -1.85E-08 | 2.05E-09 | -2.80E-07 | -9.83E-08 |
| A12 | 0 | 0 | -1.46E-08 | -1.63E-08 |
| A14 | 0 | 0 | 1.10E-09 | 2.49E-09 |
| A16 | 0 | 0 | -7.40E-11 | -8.20E-11 |
Fig. 6 shows a relative illuminance curve of the optical imaging lens of embodiment 2, which represents the ratio of illuminance at different coordinate points of the image plane to illuminance at the center point.
Fig. 7 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. 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 large-aperture vehicle-mounted 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, and the spherical and aspherical hybrid optical system is used by reasonably distributing the surface type and focal power of each lens, and meanwhile, the advantages of large aperture, high definition resolution, excellent temperature characteristics, ultrahigh pixels and the like are considered, so that the imaging module has huge potential in the field of vehicle-mounted optical lenses.
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 big light ring on-vehicle optical system, is by first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens in proper order from the object plane to the image plane along the optical axis and constitutes 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, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface;
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, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface;
the optical system satisfies the following relationship: 0.50 < f/TTL < ImgH < 2.50;
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 large aperture vehicle-mounted optical system according to claim 1, wherein: the optical system satisfies the following conditions:
-8.0mm＜f1＜-4.0mm；
-45.0mm＜f2＜-30.0mm；
20.0mm＜f3＜40.0mm；
10.0mm＜f4＜25.0mm；
10.0mm＜f34＜20.0mm；
1.0mm＜f5＜10.0mm；
-15.0mm＜f6＜-2.0mm；
5.0mm＜f56＜20.0mm；
10.0mm＜f7＜25.0mm；
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, f34 is the focal length of the cemented lens of the third lens and 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 large aperture vehicle-mounted optical system according to claim 1, wherein: the optical system satisfies the following conditions:
-2.5＜f1/f＜-0.5；
-10.0＜f2/f＜-3.5；
2.0＜f3/f＜15.0；
3.0＜f4/f＜9.0；
2.5＜f34/f＜12.0；
0.5＜f5/f＜6.0；
-2.0＜f6/f＜0.5；
-5.0＜f56/f＜-1.0；
-3.0＜f7/f＜-0.1；
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, f34 is a focal length of a cemented lens combining the third lens and 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 large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: 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.
5. A large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: 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.
6. A large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: the full field angle FOV of this optical system satisfies: 140.00 DEG < FOV < 180.00 deg.
7. A large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: 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 0.15.
8. A large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: the third lens and the fourth lens form a cemented lens, and the fifth lens and the sixth lens form a cemented lens.
9. A large aperture vehicle-mounted optical system according to any one of claims 1-3, characterized in that: the optical system further includes a stop disposed between the fourth lens and the fifth lens.
10. An imaging module comprising at least an optical lens, wherein the large aperture vehicle-mounted optical system according to any one of claims 1 to 9 is installed in the optical lens.
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