CN116400483A - Ultra-wide angle small-caliber ultra-thin optical system and camera module applying same - Google Patents
Ultra-wide angle small-caliber ultra-thin optical system and camera module applying same Download PDFInfo
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- 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
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Abstract
The invention discloses an ultra-wide angle small-caliber ultra-thin optical system and an imaging module applied to the same, which mainly comprise 6 lenses, can realize miniaturization, and simultaneously has the functions of small head and ultra-wide angle shooting by reasonable focal power distribution and high-order aspheric surface parameter optimization selection, has the advantages of ultra-wide angle, miniaturization and ultra-thin, has a compact structure, is convenient to process and install, and has good imaging resolving power.
Description
Technical Field
The application relates to the field of optical imaging systems, and particularly discloses an ultra-wide angle small-caliber ultra-thin optical system applied to head-mounted equipment and a camera module applied to the ultra-wide angle small-caliber ultra-thin optical system.
Background
With the rapid development of modern technologies, various intelligent terminal devices (including digital cameras, smart phones, etc.) are rapidly developing and popularizing, and optical lenses in key parts of the intelligent terminal devices are also more diversified, so that the intelligent terminal devices are light and thin, have good imaging quality, and have wide-angle shooting function. Especially, the development of comprehensive screen and under-screen technology, and the development of small-head camera modules has been completed. However, the field angle of the lens of the current large-head camera module is not large enough, so that the ultra-wide-angle shooting function cannot be realized, and meanwhile, the overall thinness and thinness is poor, so that the small-size design requirement cannot be met.
Disclosure of Invention
In order to solve the problems that an optical system or a camera module of the existing head-mounted equipment is not large enough in field angle, poor in overall light and thin performance and incapable of adapting to miniaturized design requirements, the embodiment of the invention discloses an ultra-wide-angle small-caliber ultra-thin optical system, and the small-head and ultra-wide-angle shooting functions can be realized while the miniaturization is realized through reasonable optical power distribution and high-order aspheric surface parameter optimization selection.
An ultra-wide angle small-caliber ultra-thin optical system sequentially comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object plane to an image plane along an optical axis;
the object plane side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens is a convex surface, the image plane side is a convex surface, and the focal power of the second lens is positive;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has optical power;
the object plane side of the sixth lens is a convex surface, and the image plane side is a concave surface, and has optical power.
Further, the optical system satisfies the following condition:
87<FOV/(TTL/IamgH/DT11)<100；
wherein, FOV is the maximum angle of view of the optical system, TTL is the on-axis distance from the first lens object side to the imaging plane, imgH is half the diagonal length of the effective pixel area on the imaging plane, and DT11 is the maximum effective radius of the first lens object side.
Further, the optical system satisfies the following condition:
0.7<(f5-f6)/f5<3.2；
wherein f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.
Further, the optical system satisfies the following condition:
1.2<|R8|/R2<3.8；
wherein R2 is the radius of curvature of the image-side surface of the first lens element, and R8 is the radius of curvature of the image-side surface of the fourth lens element.
Further, the optical system satisfies the following condition:
-3.3<R3/R4<-1.0；
wherein R3 is the radius of curvature of the object-side surface of the second lens element, and R4 is the radius of curvature of the image-side surface of the second lens element.
Further, the optical system satisfies the following condition:
0<R12/R11+|SAG12/SAG11|<1.2；
wherein, R11 is the radius of curvature of the object side surface of the sixth lens, R12 is the radius of curvature of the image side surface of the sixth lens, SAG11 is the distance from the maximum effective clear aperture of the object side surface of the sixth lens to the direction parallel to the optical axis at the intersection point of the object side surface of the sixth lens and the optical axis, and SAG12 is the distance from the maximum effective clear aperture of the image side surface of the sixth lens to the direction parallel to the optical axis at the intersection point of the image side surface of the sixth lens and the optical axis.
Further, the optical system satisfies the following condition:
-4.1<DT52/SAG10<-2.1；
wherein DT52 is the maximum effective radius of the fifth lens image-side surface, SAG10 is the distance from the maximum effective clear aperture of the fifth lens image-side surface to the intersection point of the fifth lens image-side surface and the optical axis, which is parallel to the optical axis direction.
Further, the optical system satisfies the following condition:
0.7<(CT5+CT6)/T12<1.4；
wherein, CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis.
Further, the optical system satisfies the following condition:
2.3<ΣCT/ΣAT<3.0；
wherein Σct is the sum of thicknesses of centers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, Σat is the sum of air intervals between two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis.
Further, the optical system satisfies the following condition:
0.7<f12/f23<1.7；
wherein f12 is the effective combined focal length of the first lens and the second lens, and f23 is the effective combined focal length of the second lens and the third lens.
Further, the optical system satisfies the following condition:
0<f/R11<1.8；
where f is the effective focal length of the optical imaging system, and R11 is the radius of curvature of the object side surface of the sixth lens.
Further, the optical system satisfies the following condition:
1.4<(DT62-DT61)/|DT12-DT11|<2.4；
wherein DT11 is the maximum effective radius of the first lens object-side surface, DT12 is the maximum effective radius of the first lens image-side surface, DT61 is the maximum effective radius of the sixth lens object-side surface, and DT62 is the maximum effective radius of the sixth lens image-side surface.
Further, the optical system satisfies the following condition:
12<f*tan(HFOV)/T12<18；
where f is the effective focal length of the optical system, HFOV is half the maximum field angle of the optical system, and T12 is the air separation of the first and second lenses on the optical axis.
Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
Further, the maximum effective radius DT11 of the first lens object side surface satisfies: DT11<1.6mm; the F number of the optical system is 2.4; the full field angle FOV of the optical system satisfies: FOV >168 °; the total optical length TTL of the optical system satisfies the following conditions: TTL is less than or equal to 5.1mm.
On the other hand, the embodiment of the application also provides a head-mounted camera module, which at least comprises an optical lens, wherein the ultra-wide angle small-caliber ultra-thin optical system is arranged in the optical lens.
Compared with the prior art, the beneficial effects of the application are as follows:
the optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and through reasonable distribution of focal power and optimal selection of high-order aspheric parameters, the small-head and ultra-wide-angle shooting function can be realized, the advantages of ultra-wide angle, miniaturization and ultra-thin are achieved, the structure is compact, the processing and the installation are convenient, and meanwhile, the imaging resolving power is good.
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 an on-axis chromatic aberration, astigmatism, and distortion curve of an optical system or camera module of embodiment 1 of the present application;
fig. 3 is a schematic structural diagram of an optical system or an image capturing module according to embodiment 2 of the present application;
FIG. 4 is an on-axis chromatic aberration, astigmatism, and distortion curve for an optical system or camera module of embodiment 2 of the present application;
fig. 5 is a schematic structural diagram of an optical system or an image capturing module according to embodiment 3 of the present application;
FIG. 6 is an on-axis chromatic aberration, astigmatism, and distortion curve for an optical system or camera module of example 3 of the present application;
fig. 7 is a schematic structural diagram of an optical system or an image capturing module according to embodiment 4 of the present application;
FIG. 8 is an on-axis chromatic aberration, astigmatism, and distortion curve for an optical system or camera module of example 4 of the present application;
fig. 9 is a schematic structural view of an optical system or an image capturing module according to embodiment 5 of the present application;
fig. 10 is an on-axis chromatic aberration, astigmatism, and distortion curve of the optical system or camera module of embodiment 5 of the present application.
Detailed Description
As shown in fig. 1-10, the present application provides an ultra-wide angle small caliber ultra-thin optical system, which sequentially includes, along an optical axis, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an infrared filter E7 from an object plane to an image plane, wherein the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 are aspheric lenses, and are all separately arranged with air as an interval;
the object plane side of the first lens E1 is a concave surface, and the focal power of the first lens E1 is negative;
the object plane side of the second lens E2 is a convex surface, the image plane side is a convex surface, and the focal power of the second lens E2 is positive;
the third lens E3 has optical power;
the fourth lens E4 has optical power;
the fifth lens E5 has optical power;
the sixth lens element E6 has a convex object-side surface and a concave image-side surface, and has optical power.
Further, the optical system satisfies the following condition: 87< FOV/(TTL/IamgH/DT 11) <100; wherein, FOV is the maximum angle of view of the optical system, TTL is the distance from the object side of the first lens E1 to the axis of the imaging surface, imgH is half of the diagonal length of the effective pixel area on the imaging surface, DT11 is the maximum effective radius of the object side of the first lens E1, and by controlling the maximum angle of view of the optical system, the distance from the object side of the first lens E1 to the axis of the imaging surface, half of the diagonal length of the effective pixel area on the imaging surface and the ratio range of the maximum effective radius of the object side of the first lens E1, the optical system has good light and thin properties while meeting the wide angle requirement, and the optical system is ensured to have the characteristics of ultra wide angle, miniaturization and light and thin; the lower limit of the relation is lower than the lower limit of the relation, and the requirements of ultra wide angle and light and thin optical lenses are not met; exceeding the upper limit of the relational expression makes it difficult for the optical lens to obtain a good imaging resolution.
The optical system of the embodiment of the invention mainly consists of 6 lenses, can realize miniaturization and super-wide angle shooting functions by reasonable focal power distribution and high-order aspheric parameters optimization selection, has the advantages of super-wide angle, miniaturization and ultra-thin, has compact structure, is convenient to process and install, and has good imaging resolving power.
Further, the optical system satisfies the following condition: 0.7< (f 5-f 6)/f 5<3.2; wherein f5 is the effective focal length of the fifth lens E5, f6 is the effective focal length of the sixth lens E6, and the ratio of the focal power of the optical group members of the fifth lens E5 and the sixth lens E6 close to the image plane is reasonably distributed within a reasonable range, so that the residual spherical aberration after balancing can balance the spherical aberration generated by the front four lenses, further the spherical aberration of the system is subjected to fine tuning control, and the precise control of the on-axis visual field aberration is enhanced.
Further, the optical system satisfies the following condition: 1.2< |R8|/R2<3.8; wherein, R2 is the radius of curvature of the image side of the first lens element E1, R8 is the radius of curvature of the image side of the fourth lens element E4, and by defining the ratio of the radius of curvature of the image side of the first lens element E1 to the radius of curvature of the image side of the fourth lens element E4, the first lens element E1 and the fourth lens element E4 can be controlled to exhibit reasonable planar profiles, so that the light rays with a central field of view and an edge field of view have good deflection effect and aberration correction capability, and the aberration of the full field of view can be balanced well.
Further, the optical system satisfies the following condition: -3.3< R3/R4< -1.0; wherein, R3 is the radius of curvature of the object-side surface of the second lens element E2, and R4 is the radius of curvature of the image-side surface of the second lens element E2, and by controlling the radii of curvature of the object-side surface and the image-side surface of the second lens element E2 to be in a reasonable interval, the contribution of the astigmatism of the object-side surface and the image-side surface can be effectively controlled, so that the image quality of the intermediate field of view and the aperture zone can be effectively controlled reasonably.
Further, the optical system satisfies the following condition: 0< R12/R11+|SAG12/SAG11| <1.2; wherein, R11 is the radius of curvature of the object side surface of the sixth lens element E6, R12 is the radius of curvature of the image side surface of the sixth lens element E6, SAG11 is the distance from the position of the maximum effective clear aperture of the object side surface of the sixth lens element E6 to the position of the intersection point of the object side surface of the sixth lens element E6 and the optical axis parallel to the optical axis direction, SAG12 is the distance from the position of the maximum effective clear aperture of the image side surface of the sixth lens element E6 to the position of the intersection point of the image side surface of the sixth lens element E6 and the optical axis parallel to the optical axis direction, and by restricting the above-mentioned sub-ranges, the shape of the sixth lens element E6 can be restricted, so as to reduce the complexity of the surface type of the sixth lens element E6, improve the workability of the sixth lens element E6, and correct the astigmatism of the optical system, and reduce the risk of ghost images of the sixth lens element E6, thereby improving the imaging quality of the optical system.
Further, the optical system satisfies the following condition: -4.1< dt52/SAG10< -2.1; wherein, DT52 is the maximum effective radius of the image-side surface of the fifth lens element E5, SAG10 is the distance from the maximum effective clear aperture of the image-side surface of the fifth lens element E5 to the intersection point of the image-side surface of the fifth lens element E5 and the optical axis in the direction parallel to the optical axis, and the optical system satisfies the above relationship, so as to facilitate preventing the surface of the image-side surface of the fifth lens element E5 from being excessively curved, thereby reducing the processing difficulty of the fifth lens element E5; the maximum effective caliber of the image side surface of the fifth lens E5 is too small below the lower limit of the relation, so that the incidence of large-angle light rays to the optical system is not facilitated, and the imaging range of the optical system is reduced; exceeding the upper limit of the relation, the image side surface of the fifth lens element E5 is too flat, and there is a high risk of generating ghost images in the optical system.
Further, the optical system satisfies the following condition: 0.7< (CT5+CT6)/T12 <1.4; the CT5 is the center thickness of the fifth lens E5 on the optical axis, the CT6 is the center thickness of the sixth lens E6 on the optical axis, and the T12 is the air space between the first lens E1 and the second lens E2 on the optical axis, so that when the above condition is satisfied, the center thicknesses of the fifth lens E5 and the sixth lens E6 and the air space between the first lens E1 and the second lens E2 on the optical axis can be effectively compressed, thereby being beneficial to shortening the total length of the system, realizing the miniaturized design, and meanwhile, being beneficial to preventing the air space between the first lens E1 and the second lens E2 on the optical axis from being too small, so that the light smoothly transits between the first lens E1 and the second lens E2, thereby being beneficial to correcting the aberration of the system and improving the imaging quality of the system.
Further, the optical system satisfies the following condition: 2.3< Σct/Σat <3.0; wherein Σct is the sum of the thicknesses of the centers of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 on the optical axis, Σat is the sum of the air spaces between the adjacent two lenses of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 on the optical axis, and the above-mentioned sub-types are limited within a reasonable range, which is helpful for improving the imaging quality, and the smooth transition on each lens can be realized in the light transmission process; the lower limit of the relation is lower than the lower limit of the relation, and the light rays of the optical system cannot be effectively controlled, so that the aberration of the optical system is increased, and the imaging quality of the optical system is further reduced; if the upper limit of the relation is exceeded, the overall thickness of the lens is too large, which is not beneficial to the convergence and diffusion of light rays among the lenses, so that the lens is forced to change the light ray trend in a more curved surface shape, and the difficulty of lens manufacturing is increased.
Further, the optical system satisfies the following condition: 0.7< f12/f23<1.7; wherein f12 is the effective combined focal length of the first lens E1 and the second lens E2, f23 is the effective combined focal length of the second lens E2 and the third lens E3, and by restricting the ratio of the combined focal length of the first lens E1 and the second lens E2 to the combined focal length of the second lens E2 and the combined focal length of the third lens E3, the focal powers of the first lens E1 to the third lens E3 can be reasonably distributed, the aberration variation from the central view field to the edge view field of the optical system can be effectively restricted, and meanwhile, excessive bending of the effective diameter areas of the first lens E1 to the third lens E3 is avoided, the imaging performance of the optical system is deteriorated, and the sensitivity of the eccentric tilt of the lens and the like is suppressed in a good range.
Further, the optical system satisfies the following condition: 0<f/R11<1.8; wherein f is the effective focal length of the optical imaging system, R11 is the radius of curvature of the object side surface of the sixth lens element E6, and by making the optical system satisfy the above relation, it is beneficial to restricting the bending degree of the object side surface of the sixth lens element E6, making more light enter the optical system, and at the same time, it is beneficial to reasonably distributing the refractive power of the optical system and correcting the off-axis aberration of the field of view of the optical system. The focal length of the optical system is too large below the lower limit of the relation, which is unfavorable for realizing the miniaturization characteristic, thereby influencing the light and thin of the whole optical system; exceeding the upper limit of the relation, the radius of curvature of the object-side surface of the sixth lens element E6 is too small to correct aberrations.
Further, the optical system satisfies the following condition: 1.4< (DT 62-DT 61)/|DT 12-DT11| <2.4; the DT11 is the maximum effective radius of the object side surface of the first lens element E1, the DT12 is the maximum effective radius of the image side surface of the first lens element E1, the DT61 is the maximum effective radius of the object side surface of the sixth lens element E6, and the DT62 is the maximum effective radius of the image side surface of the sixth lens element E6, so that the aperture relationship between the first lens element E1 and the sixth lens element E6 at a large angle of view can be reasonably controlled by restricting the ratio range of the maximum effective half apertures of the object side surface and the image side surface of the first lens element E1 to the object side surface and the image side surface of the sixth lens element E6, so that the maximum effective half aperture of the first lens element E1 is maintained in a reasonable range and has a small head characteristic; and when the upper limit of the relation is exceeded, the caliber difference of the first lens E1 is reduced compared with that of the eighth lens, and the reduction of the optical lens head and the improvement of compactness are not facilitated. Below the lower limit of the relation, the caliber of the first lens E1 is excessively compressed, which is unfavorable for improving the image quality of the optical lens and correcting the distortion.
Further, the optical system satisfies the following condition: 12< f tan (HFOV)/T12 <18; where f is the effective focal length of the optical system, HFOV is half of the maximum field angle of the optical system, T12 is the air space on the optical axis between the first lens E1 and the second lens E2, and by reasonably distributing the effective focal length of the optical imaging system, half of the maximum field angle of the optical imaging system, and the limitation of the air space on the optical axis between the first lens E1 and the second lens E2, the size of the system can be effectively compressed, so that the light deflection angle is small.
Further, the maximum effective radius DT11 of the object side surface of the first lens E1 satisfies: DT11<1.6mm, the F number of the optical system being 2.4; the full field angle FOV of the optical system satisfies: FOV >168 °; the total optical length TTL of the optical system satisfies the following conditions: the TTL is less than or equal to 5.1mm, the design can reduce the total optical length, can effectively miniaturize the lens, and the head-mounted optical system provided by the invention has the advantages of ultra wide angle, miniaturization and ultra-thin, has a compact structure, is convenient to process and install, and has good imaging resolving power.
Specifically, as a preferred embodiment of the present invention, but not limited to, as shown in fig. 1-2, in the present embodiment 1, the first lens E1 has negative optical power, the object side surface S1 thereof is convex, and the image side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative 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, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. 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 refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15, and the surface type, radius of curvature, thickness, and material of each lens are shown in table 1.
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 | 300 | |
| S1 | Q-type aspheric surface | 800.0000 | 0.4000 | 1.77,49.50 |
| S2 | Q-type aspheric surface | 1.5000 | 1.0059 | |
| STO | Spherical surface | Infinity is provided | 0.0110 | |
| S3 | Q-type aspheric surface | 3.9543 | 0.6979 | 1.54,55.77 |
| S4 | Q-type aspheric surface | -1.4301 | 0.0300 | |
| S5 | Q-type aspheric surface | 3.9883 | 0.3000 | 1.66,20.38 |
| S6 | Q-type aspheric surface | 1.3894 | 0.0300 | |
| S7 | Q-type aspheric surface | 1.3344 | 0.5545 | 1.54,55.77 |
| S8 | Q-type aspheric surface | 4.6540 | 0.0300 | |
| S9 | Q-type aspheric surface | 2.0911 | 0.5830 | 1.54,55.77 |
| S10 | Q-type aspheric surface | -3.0876 | 0.0500 | |
| S11 | Q-type aspheric surface | 1.1535 | 0.3500 | 1.66,20.38 |
| S12 | Q-type aspheric surface | 0.7602 | 0.2641 | |
| S13 | Spherical surface | Infinity is provided | 0.2100 | 1.52,64.17 |
| S14 | Spherical surface | Infinity is provided | 0.5895 | |
| S15 | Spherical surface | Infinity is provided |
In table 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formulas:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, am is the aspheric coefficient, rmax is the maximum value of the radial coordinate, u=r/rmax. The cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 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 | S1 | S2 | S3 | S4 | S5 | S6 |
| K | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| A4 | 4.08E-01 | 1.93E-01 | -1.48E-02 | -1.23E-01 | -8.51E-02 | -1.55E-01 |
| A6 | -7.31E-02 | 2.20E-03 | -7.84E-04 | -1.02E-03 | 9.32E-03 | 4.32E-04 |
| A8 | 1.34E-02 | -1.89E-04 | 3.40E-04 | -1.42E-03 | 1.84E-03 | -4.67E-03 |
| A10 | -6.99E-03 | -2.68E-03 | 3.47E-04 | -8.77E-04 | -7.93E-04 | -1.54E-04 |
| A12 | 1.89E-03 | -1.11E-03 | 2.87E-04 | 2.12E-04 | 5.64E-04 | -1.71E-04 |
| A14 | -4.36E-04 | -1.37E-04 | 1.84E-04 | -3.24E-04 | -2.67E-04 | 1.45E-04 |
| A16 | 1.30E-04 | 6.17E-05 | 1.12E-04 | -2.30E-05 | 1.58E-04 | 1.30E-04 |
| A18 | -1.10E-05 | 3.51E-05 | 4.81E-05 | -6.72E-05 | -1.98E-05 | 1.64E-04 |
| A20 | 3.30E-05 | 4.01E-05 | 1.97E-05 | -1.74E-05 | 2.29E-05 | 3.59E-05 |
| A22 | 8.53E-06 | -1.60E-06 | 2.66E-06 | -5.91E-06 | -1.28E-06 | -2.75E-07 |
| A24 | -1.62E-05 | 2.28E-06 | 3.08E-06 | 1.07E-06 | -1.09E-06 | -5.17E-07 |
| A26 | -7.83E-06 | -1.04E-06 | 4.37E-07 | 3.04E-08 | -4.87E-07 | -6.38E-07 |
| A28 | 1.37E-06 | -4.59E-07 | 1.19E-06 | 3.56E-07 | -8.39E-07 | 9.94E-07 |
| A30 | 3.27E-06 | -2.06E-07 | -1.86E-06 | -1.89E-07 | 1.56E-06 | 3.44E-07 |
| Face number | S7 | S8 | S9 | S10 | S11 | S12 |
| K | -2.10E+01 | 1.04E+01 | -4.23E+00 | -3.12E+00 | -2.83E+01 | -1.62E+00 |
| A4 | 1.18E-02 | -2.48E-01 | -2.15E-01 | -1.02E-01 | -6.85E-01 | -1.27E+00 |
| A6 | -6.06E-03 | 1.25E-02 | -7.84E-02 | -1.47E-02 | 4.20E-01 | 1.53E+00 |
| A8 | -1.93E-03 | 2.28E-02 | 2.42E-02 | 3.35E-02 | -1.55E-01 | 1.32E-01 |
| A10 | -1.01E-04 | -2.56E-03 | 2.38E-03 | 9.70E-03 | 2.27E-02 | 8.13E-02 |
| A12 | 3.01E-04 | 2.07E-03 | 4.29E-03 | -1.70E-02 | 3.24E-02 | -9.37E-02 |
| A14 | 3.17E-04 | 2.88E-04 | 1.39E-03 | 2.27E-03 | -2.46E-02 | 2.74E-02 |
| A16 | 5.48E-04 | -5.39E-04 | -6.99E-04 | -4.50E-03 | 7.71E-03 | 5.13E-02 |
| A18 | 3.57E-04 | -1.17E-04 | -5.15E-04 | 3.99E-04 | 6.94E-03 | 2.86E-02 |
| A20 | 1.47E-04 | -8.81E-05 | -2.41E-04 | -6.40E-05 | -4.01E-03 | 5.28E-03 |
| A22 | 7.61E-07 | 7.91E-08 | 1.36E-05 | 7.52E-07 | -2.13E-05 | 1.27E-04 |
| A24 | 2.13E-06 | 3.53E-06 | 7.38E-07 | -1.14E-05 | 6.32E-06 | -1.36E-04 |
| A26 | -3.79E-07 | -6.42E-06 | -2.26E-06 | 1.61E-05 | 2.66E-05 | 7.01E-05 |
| A28 | -1.64E-06 | -2.04E-06 | 3.55E-06 | -1.63E-06 | -1.47E-05 | 1.67E-05 |
| A30 | 5.55E-09 | -1.86E-06 | -3.31E-06 | -2.00E-05 | -3.55E-05 | -7.30E-05 |
Fig. 2 shows on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of example 1. On-axis chromatic aberration means that the converging focus of light rays with different wavelengths deviates after passing through a lens; astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights. It can be seen from fig. 2 that the optical system given in embodiment 1 can achieve good imaging quality.
Specifically, as a preferred embodiment of the present invention, but not limited to, as shown in fig. 3-4, in the present embodiment 2, the first lens E1 has negative optical power, the object side surface S1 thereof is concave, and the image side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. 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 refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15, and the surface type, radius of curvature, thickness, and material of each lens are shown in table 3.
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 | 300 | |
| S1 | Q-type aspheric surface | -6.9934 | 0.4000 | 1.64,56.07 |
| S2 | Q-type aspheric surface | 1.6138 | 0.8359 | |
| STO | Spherical surface | Infinity is provided | 0.0014 | |
| S3 | Q-type aspheric surface | 3.1750 | 0.6894 | 1.54,55.77 |
| S4 | Q-type aspheric surface | -0.9804 | 0.0300 | |
| S5 | Q-type aspheric surface | -27.2908 | 0.3479 | 1.66,20.38 |
| S6 | Q-type aspheric surface | 9.8890 | 0.0538 | |
| S7 | Q-type aspheric surface | -3.8597 | 0.4000 | 1.54,55.77 |
| S8 | Q-type aspheric surface | 2.0721 | 0.0300 | |
| S9 | Q-type aspheric surface | 1.3000 | 0.8185 | 1.54,55.77 |
| S10 | Q-type non-magnetic resonance imaging deviceSpherical surface | -0.8449 | 0.0500 | |
| S11 | Q-type aspheric surface | 4.5186 | 0.3500 | 1.66,20.38 |
| S12 | Q-type aspheric surface | 0.9197 | 0.2614 | |
| S13 | Spherical surface | Infinity is provided | 0.2100 | 1.52,64.17 |
| S14 | Spherical surface | Infinity is provided | 0.5855 | |
| S15 | Spherical surface | Infinity is provided |
In table 3, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formulas:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, am is the aspheric coefficient, rmax is the maximum value of the radial coordinate, u=r/rmax. The cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 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 | S1 | S2 | S3 | S4 | S5 | S6 |
| K | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| A4 | 5.41E-01 | 2.98E-01 | -9.17E-03 | -9.17E-03 | -1.58E-01 | -1.01E-01 |
| A6 | -1.90E-01 | -1.76E-02 | -1.07E-03 | -1.07E-03 | 1.49E-02 | -4.07E-04 |
| A8 | 2.60E-02 | -2.18E-04 | 4.81E-05 | 4.81E-05 | -2.19E-03 | -3.81E-03 |
| A10 | -1.68E-02 | -2.12E-03 | 2.55E-05 | 2.55E-05 | 2.55E-03 | -4.39E-04 |
| A12 | 5.57E-03 | 9.37E-04 | 5.84E-05 | 5.84E-05 | -1.46E-03 | -5.46E-04 |
| A14 | -1.03E-03 | 3.67E-04 | -1.91E-05 | -1.91E-05 | -3.29E-04 | 3.87E-05 |
| A16 | 2.25E-03 | -7.98E-05 | -3.14E-05 | -3.14E-05 | -1.99E-04 | 3.65E-04 |
| A18 | 5.37E-04 | 2.50E-04 | -7.18E-05 | -7.18E-05 | -2.75E-05 | 8.66E-05 |
| A20 | -2.52E-05 | 3.50E-04 | -6.38E-05 | -6.38E-05 | 1.15E-04 | 1.39E-04 |
| A22 | -6.50E-04 | 2.81E-04 | -6.40E-05 | -6.40E-05 | -5.73E-05 | -3.74E-05 |
| A24 | -3.79E-04 | 3.66E-05 | -3.91E-05 | -3.91E-05 | 1.78E-05 | 2.53E-05 |
| A26 | 7.16E-05 | -4.15E-05 | -2.67E-05 | -2.67E-05 | -3.33E-05 | 1.53E-04 |
| A28 | 2.71E-04 | -6.48E-05 | -9.07E-06 | -9.07E-06 | 7.98E-06 | 8.56E-06 |
| A30 | 1.83E-04 | -1.22E-05 | -7.50E-06 | -7.50E-06 | 1.39E-07 | 3.66E-05 |
| Face number | S7 | S8 | S9 | S10 | S11 | S12 |
| K | -3.30E+01 | 7.08E-01 | -1.14E+01 | -3.61E+00 | -3.17E+01 | -1.68E+00 |
| A4 | 3.69E-02 | -3.55E-01 | -2.03E-01 | -8.09E-02 | -9.20E-01 | -1.48E+00 |
| A6 | -1.01E-02 | 2.29E-03 | -4.62E-02 | -1.66E-02 | 6.91E-01 | 1.33E+00 |
| A8 | 1.59E-03 | 1.35E-02 | 2.18E-02 | 2.07E-02 | -1.32E-01 | 2.40E-01 |
| A10 | -1.23E-03 | -3.74E-03 | 1.29E-03 | 8.97E-03 | -4.99E-02 | 6.81E-02 |
| A12 | 4.95E-04 | 2.87E-03 | 3.56E-03 | -6.65E-03 | 3.55E-02 | -7.96E-02 |
| A14 | -3.26E-04 | -3.83E-05 | -5.04E-04 | -3.16E-03 | 3.47E-03 | 1.34E-02 |
| A16 | 6.66E-04 | 8.46E-04 | 2.02E-04 | -6.29E-04 | -1.01E-02 | 5.21E-02 |
| A18 | 1.71E-04 | -6.15E-04 | -1.28E-03 | -6.00E-04 | -4.55E-04 | 3.06E-02 |
| A20 | 2.05E-04 | 6.11E-05 | 1.40E-05 | 9.44E-04 | 4.59E-03 | 5.65E-03 |
| A22 | -1.29E-04 | -2.49E-05 | 8.11E-05 | 1.79E-04 | -1.54E-03 | -3.37E-03 |
| A24 | -3.84E-05 | 6.50E-05 | 1.67E-04 | -1.16E-05 | -1.82E-03 | 1.99E-04 |
| A26 | 1.44E-04 | -4.42E-05 | -7.14E-05 | -2.72E-04 | 1.44E-03 | 2.73E-03 |
| A28 | -4.72E-05 | 7.69E-06 | -2.05E-05 | -9.18E-05 | 6.22E-04 | 1.76E-03 |
| A30 | 1.94E-05 | 6.96E-07 | -1.38E-05 | -6.36E-05 | -1.02E-03 | 2.18E-04 |
Fig. 4 shows on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of example 2. On-axis chromatic aberration means that the converging focus of light rays with different wavelengths deviates after passing through a lens; astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights. It can be seen from fig. 4 that the optical system given in embodiment 2 can achieve good imaging quality.
Specifically, as a preferred embodiment of the present invention, but not limited to, as shown in fig. 5-6, in the present embodiment 3, the first lens E1 has negative optical power, the object side surface S1 thereof is concave, and the image side surface S2 thereof is concave. 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 element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. 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 positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15, and the surface type, radius of curvature, thickness, and material of each lens are shown in table 5.
Table 5: example 3 basic parameters of an optical System
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | 300 | |
| S1 | Q-type aspheric surface | -6.8493 | 0.4037 | 1.57,63.46 |
| S2 | Q-type aspheric surface | 1.4138 | 0.9915 | |
| STO | Spherical surface | Infinity is provided | -0.0155 | |
| S3 | Q-type aspheric surface | 2.1249 | 0.7218 | 1.54,55.77 |
| S4 | Q-type aspheric surface | -0.9179 | 0.0300 | |
| S5 | Q-type aspheric surface | -3.3535 | 0.3000 | 1.66,20.38 |
| S6 | Q-type aspheric surface | -500.0000 | 0.0421 | |
| S7 | Q-type aspheric surface | -4.7118 | 0.5958 | 1.54,55.77 |
| S8 | Q-type aspheric surface | -5.2579 | 0.0302 | |
| S9 | Q-type aspheric surface | 85.9958 | 0.4679 | 1.54,55.77 |
| S10 | Q-type aspheric surface | -15.1415 | 0.0777 | |
| S11 | Q-type aspheric surface | 0.7362 | 0.3500 | 1.66,20.38 |
| S12 | Q-type aspheric surface | 0.7061 | 0.2855 | |
| S13 | Spherical surface | Infinity is provided | 0.2100 | 1.52,64.17 |
| S14 | Spherical surface | Infinity is provided | 0.6080 | |
| S15 | Spherical surface | Infinity is provided |
In table 5, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formulas:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, am is the aspheric coefficient, rmax is the maximum value of the radial coordinate, u=r/rmax. The cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 for each of the aspherical surfaces usable in example 3 are given in table 6.
Table 6: example 3 aspherical correlation values of lens surfaces
| Face number | S1 | S2 | S3 | S4 | S5 | S6 |
| K | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| A4 | 6.26E-01 | 3.61E-01 | -7.68E-03 | -5.85E-02 | -1.78E-01 | -7.82E-02 |
| A6 | -1.80E-01 | -3.72E-03 | -7.27E-04 | -1.44E-03 | 1.71E-02 | 3.32E-03 |
| A8 | 3.12E-02 | -6.83E-03 | -1.53E-04 | -3.63E-03 | 7.19E-04 | -2.56E-03 |
| A10 | -1.35E-02 | -5.08E-03 | 3.85E-05 | 1.42E-03 | 1.43E-03 | -3.05E-03 |
| A12 | 3.88E-03 | -1.77E-04 | 1.24E-06 | -3.79E-04 | -1.93E-03 | 1.06E-03 |
| A14 | -2.63E-03 | 1.72E-03 | 2.88E-05 | -9.64E-05 | -1.79E-04 | -7.88E-04 |
| A16 | 9.72E-04 | 9.42E-04 | 4.58E-06 | -3.56E-04 | 1.29E-04 | 6.68E-04 |
| A18 | 5.23E-05 | 5.74E-04 | 1.51E-05 | -1.26E-04 | 8.53E-05 | 2.10E-04 |
| A20 | 7.08E-04 | -1.74E-04 | 1.93E-06 | -4.25E-05 | -2.03E-04 | 1.93E-04 |
| A22 | 6.15E-04 | -9.01E-05 | 7.80E-06 | 8.84E-05 | -8.24E-05 | -1.99E-04 |
| A24 | 6.43E-04 | -1.01E-04 | 1.32E-06 | 1.43E-04 | 6.87E-05 | 4.62E-05 |
| A26 | 4.13E-04 | 1.32E-04 | 4.40E-06 | 1.31E-04 | 8.42E-05 | -3.62E-05 |
| A28 | 1.81E-04 | 9.99E-05 | -7.74E-07 | 7.75E-05 | 5.62E-05 | 5.21E-05 |
| A30 | 3.49E-05 | 1.04E-04 | 2.50E-06 | 3.01E-05 | 9.74E-06 | -4.14E-06 |
| Face number | S7 | S8 | S9 | S10 | S11 | S12 |
| K | -1.23E+01 | -9.69E+01 | 9.90E+01 | 8.65E+01 | 8.65E+01 | -1.91E+00 |
| A4 | 2.44E-02 | -3.04E-01 | -2.06E-01 | -2.77E-01 | -2.77E-01 | -1.56E+00 |
| A6 | -4.03E-03 | 1.44E-02 | -4.33E-02 | 2.60E-02 | 2.60E-02 | 1.37E+00 |
| A8 | 2.06E-03 | 1.47E-02 | 1.85E-02 | -2.62E-02 | -2.62E-02 | 2.30E-01 |
| A10 | -3.87E-03 | -4.65E-03 | -1.56E-04 | 3.83E-02 | 3.83E-02 | 7.54E-02 |
| A12 | 2.27E-03 | 3.57E-03 | 3.45E-03 | -1.74E-02 | -1.74E-02 | -8.68E-02 |
| A14 | -1.05E-03 | -1.12E-03 | -1.75E-03 | 7.09E-03 | 7.09E-03 | 1.33E-02 |
| A16 | 9.44E-04 | 5.39E-04 | 2.61E-05 | -4.90E-03 | -4.90E-03 | 4.76E-02 |
| A18 | 7.22E-05 | -3.79E-04 | -1.07E-03 | 3.50E-04 | 3.50E-04 | 3.59E-02 |
| A20 | 1.88E-04 | 1.96E-04 | 1.10E-04 | -9.72E-04 | -9.72E-04 | 2.15E-03 |
| A22 | -2.06E-04 | 1.18E-04 | -1.82E-04 | 4.67E-04 | 4.67E-04 | -4.26E-03 |
| A24 | 1.83E-04 | -1.53E-04 | -3.31E-04 | -6.02E-04 | -6.02E-04 | 2.64E-03 |
| A26 | 4.62E-05 | 1.48E-04 | 1.05E-04 | 4.30E-04 | 4.30E-04 | 2.49E-03 |
| A28 | 1.24E-04 | -7.84E-05 | -1.49E-04 | -2.24E-04 | -2.24E-04 | 4.41E-04 |
| A30 | 1.97E-05 | 3.47E-05 | 7.08E-05 | 1.39E-04 | 1.39E-04 | -1.11E-03 |
Fig. 6 shows on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of example 3. On-axis chromatic aberration means that the converging focus of light rays with different wavelengths deviates after passing through a lens; astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights. It can be seen from fig. 6 that the optical system given in embodiment 3 can achieve good imaging quality.
Specifically, as a preferred embodiment of the present invention, but not limited to, as shown in fig. 7-8, in the present embodiment 4, the first lens E1 has negative optical power, the object side surface S1 thereof is concave, and the image side surface S2 thereof is concave. 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 element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. 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 S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through each of the surfaces S1 to S14 and is finally imaged on the imaging surface S15, and the surface type, radius of curvature, thickness, and material of each lens are shown in table 7.
Table 7: example 4 basic parameters of an optical System
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | 300 | |
| S1 | Q-type aspheric surface | -4.9206 | 0.4187 | 1.58,62.74 |
| S2 | Q-type aspheric surface | 1.4286 | 1.0176 | |
| STO | Spherical surface | Infinity is provided | -0.0317 | |
| S3 | Q-type aspheric surface | 1.7232 | 0.6999 | 1.54,55.77 |
| S4 | Q-type aspheric surface | -1.0838 | 0.0657 | |
| S5 | Q-type aspheric surface | -9.9111 | 0.3000 | 1.66,20.38 |
| S6 | Q-type aspheric surface | 3.3108 | 0.0481 | |
| S7 | Q-type aspheric surface | 14.2679 | 0.6595 | 1.54,55.77 |
| S8 | Q-type aspheric surface | -2.8901 | 0.0300 | |
| S9 | Q-type aspheric surface | -20.6623 | 0.4000 | 1.54,55.77 |
| S10 | Q-type aspheric surface | -100.0000 | 0.0880 | |
| S11 | Q-type aspheric surface | 0.8476 | 0.3500 | 1.66,20.38 |
| S12 | Q-type aspheric surface | 0.7299 | 0.2608 | |
| S13 | Spherical surface | Infinity is provided | 0.2100 | 1.52,64.17 |
| S14 | Spherical surface | Infinity is provided | 0.5834 | |
| S15 | Spherical surface | Infinity is provided |
In table 7, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formulas:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, am is the aspheric coefficient, rmax is the maximum value of the radial coordinate, u=r/rmax. Table 8 shows the cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 for each of the aspherical surfaces usable in example 4.
Table 8: example 4 aspherical correlation value of lens surface
| Face number | S1 | S2 | S3 | S4 | S5 | S6 |
| K | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| A4 | 6.62E-01 | 3.99E-01 | -6.22E-03 | -7.00E-02 | -1.76E-01 | -7.97E-02 |
| A6 | -1.75E-01 | -1.40E-02 | -6.27E-04 | -1.06E-02 | 5.44E-03 | 9.16E-03 |
| A8 | 2.93E-02 | -1.50E-02 | -1.55E-04 | -1.60E-03 | 5.50E-03 | 1.15E-03 |
| A10 | -9.86E-03 | -5.96E-03 | 1.79E-05 | 1.85E-04 | 2.28E-04 | -4.38E-03 |
| A12 | 4.24E-03 | 1.28E-03 | -2.27E-05 | 5.43E-04 | -1.05E-03 | 6.29E-04 |
| A14 | -1.65E-03 | 2.30E-03 | 1.14E-05 | 2.50E-04 | -7.62E-04 | -9.83E-04 |
| A16 | 7.99E-04 | 1.12E-03 | -9.18E-06 | 7.63E-05 | 4.66E-05 | 5.95E-04 |
| A18 | 1.39E-04 | 4.60E-04 | 5.03E-06 | -1.36E-04 | 8.77E-05 | 4.55E-05 |
| A20 | 5.80E-04 | -4.36E-05 | -4.16E-06 | -1.69E-04 | 5.43E-05 | 3.69E-04 |
| A22 | 4.87E-04 | -1.16E-04 | 3.41E-06 | -1.78E-04 | -8.95E-05 | 7.48E-05 |
| A24 | 5.12E-04 | -2.03E-04 | -1.03E-06 | -1.23E-04 | -3.77E-05 | 6.07E-05 |
| A26 | 3.99E-04 | -8.86E-05 | 2.45E-06 | -7.24E-05 | -4.73E-06 | -3.13E-06 |
| A28 | 2.14E-04 | -3.34E-05 | -2.52E-06 | -2.83E-05 | 1.34E-05 | 2.87E-05 |
| A30 | 7.14E-05 | 2.79E-05 | 6.63E-07 | -6.67E-06 | 6.92E-07 | 7.84E-06 |
| Face number | S7 | S8 | S9 | S10 | S11 | S12 |
| K | -9.90E+01 | -9.90E+01 | 9.90E+01 | 9.90E+01 | -1.96E+01 | -2.09E+00 |
| A4 | 7.36E-03 | -2.70E-01 | -2.08E-01 | -3.69E-01 | -8.77E-01 | -1.52E+00 |
| A6 | -2.82E-04 | 1.73E-02 | -3.76E-02 | 3.98E-02 | 6.12E-01 | 1.42E+00 |
| A8 | 3.10E-03 | 1.49E-02 | 1.87E-02 | -4.11E-02 | -6.80E-02 | 2.14E-01 |
| A10 | -5.60E-03 | -4.55E-03 | 3.84E-04 | 4.03E-02 | -4.22E-02 | 8.73E-02 |
| A12 | 2.28E-03 | 3.91E-03 | 3.64E-03 | -1.88E-02 | 1.05E-02 | -9.70E-02 |
| A14 | -6.80E-04 | -1.02E-03 | -2.09E-03 | 9.76E-03 | 1.94E-02 | 2.61E-02 |
| A16 | 1.26E-03 | 1.25E-04 | -2.97E-04 | -4.66E-03 | -1.58E-02 | 3.73E-02 |
| A18 | 9.57E-05 | -3.81E-04 | -7.26E-04 | 1.22E-03 | 1.91E-03 | 3.90E-02 |
| A20 | 2.34E-04 | 1.40E-04 | 4.47E-04 | -2.70E-04 | 1.28E-03 | 9.21E-04 |
| A22 | -1.80E-04 | 2.35E-06 | -7.40E-05 | 3.06E-04 | 1.60E-03 | -1.41E-03 |
| A24 | -1.54E-04 | -9.58E-05 | -1.59E-04 | -3.21E-04 | -2.28E-03 | -1.12E-03 |
| A26 | -1.41E-04 | 8.44E-05 | 6.17E-05 | 3.39E-04 | -4.79E-04 | 3.59E-03 |
| A28 | -1.89E-05 | -2.70E-05 | -1.36E-04 | -2.51E-04 | 2.54E-03 | 1.75E-03 |
| A30 | -2.09E-06 | 1.81E-06 | -2.07E-05 | 1.23E-04 | 6.60E-04 | 5.36E-04 |
Fig. 8 shows on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of example 4. On-axis chromatic aberration means that the converging focus of light rays with different wavelengths deviates after passing through a lens; astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights. It can be seen from fig. 8 that the optical system given in embodiment 4 can achieve good imaging quality.
Specifically, as a preferred embodiment of the present invention, but not limited to, as shown in fig. 9-10, in the present embodiment 5, the first lens E1 has negative optical power, the object side surface S1 thereof is concave, and the image side surface S2 thereof is concave. 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 element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, 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, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. 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 concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through each of the surfaces S1 to S14 and is finally imaged on the imaging surface S15, and the surface type, radius of curvature, thickness, and material of each lens are shown in table 9.
Table 9: example 5 basic parameters of an optical System
| Face number | Surface type | Radius of curvature (mm) | Thickness (mm) | Material |
| OBJ | Spherical surface | Infinity is provided | 300 | |
| S1 | Q-type aspheric surface | -3.5483 | 0.4608 | 1.60,61.40 |
| S2 | Q-type aspheric surface | 1.7929 | 0.9206 | |
| STO | Spherical surface | Infinity is provided | -0.0291 | |
| S3 | Q-type aspheric surface | 1.9449 | 0.6848 | 1.54,55.77 |
| S4 | Q-type aspheric surface | -1.8916 | 0.0697 | |
| S5 | Q-type aspheric surface | 3.3679 | 0.3000 | 1.66,20.38 |
| S6 | Q-type aspheric surface | 3.4199 | 0.0424 | |
| S7 | Q-type aspheric surface | 19.7424 | 0.7181 | 1.54,55.77 |
| S8 | Q-type aspheric surface | -2.7484 | 0.0300 | |
| S9 | Q-type aspheric surface | 59.7820 | 0.4470 | 1.54,55.77 |
| S10 | Q-type aspheric surface | 100.0000 | 0.0723 | |
| S11 | Q-type aspheric surface | 0.9187 | 0.3500 | 1.66,20.38 |
| S12 | Q-type aspheric surface | 0.7194 | 0.2502 | |
| S13 | Spherical surface | Infinity is provided | 0.2100 | 1.52,64.17 |
| S14 | Spherical surface | Infinity is provided | 0.5732 | |
| S15 | Spherical surface | Infinity is provided |
In table 9, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formulas:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, am is the aspheric coefficient, rmax is the maximum value of the radial coordinate, u=r/rmax. Table 10 shows the cone coefficients and higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 for each of the aspherical surfaces usable in example 5.
Table 10: example 5 aspherical correlation value of lens surface
| Face number | S1 | S2 | S3 | S4 | S5 | S6 |
| K | -8.46E-02 | 8.51E-02 | -1.06E-01 | 9.11E-01 | -2.00E+01 | 1.84E+00 |
| A4 | 7.84E-01 | 4.49E-01 | -4.48E-03 | -1.33E-01 | -2.25E-01 | -5.70E-02 |
| A6 | -1.80E-01 | -1.40E-02 | -4.53E-04 | -6.53E-04 | 8.18E-03 | -6.76E-03 |
| A8 | 2.98E-02 | -2.01E-02 | -1.26E-04 | -3.51E-03 | 2.47E-03 | 9.44E-03 |
| A10 | -8.14E-03 | -7.85E-03 | 2.49E-05 | 5.13E-05 | 2.23E-03 | -5.40E-03 |
| A12 | 6.46E-03 | 1.86E-03 | -2.02E-05 | 1.23E-04 | 1.12E-04 | 2.03E-03 |
| A14 | 7.72E-05 | 3.00E-03 | 1.30E-05 | 1.24E-04 | -8.39E-04 | -1.10E-03 |
| A16 | 1.85E-03 | 1.28E-03 | -8.37E-06 | 1.82E-04 | -4.48E-04 | 9.84E-04 |
| A18 | 8.33E-04 | 3.19E-04 | 3.82E-06 | 8.65E-05 | -3.08E-04 | -3.02E-04 |
| A20 | 9.73E-04 | -3.19E-05 | -6.90E-06 | 7.17E-05 | 4.08E-05 | 5.72E-05 |
| A22 | 6.45E-04 | 7.01E-05 | 3.14E-06 | 2.73E-05 | 9.42E-05 | -1.18E-04 |
| A24 | 5.13E-04 | 8.33E-05 | -4.33E-07 | 8.03E-06 | 1.14E-04 | -2.39E-05 |
| A26 | 3.12E-04 | 1.38E-04 | 2.88E-06 | -2.61E-06 | 6.48E-05 | -6.91E-05 |
| A28 | 1.35E-04 | 9.07E-05 | -2.29E-06 | -4.61E-06 | 2.89E-05 | -2.15E-05 |
| A30 | 3.07E-05 | 5.49E-05 | 4.69E-07 | -9.81E-07 | 4.72E-06 | -1.52E-05 |
| Face number | S7 | S8 | S9 | S10 | S11 | S12 |
| K | 9.90E+01 | -9.71E+01 | 2.49E+01 | -9.90E+01 | -2.22E+01 | -2.15E+00 |
| A4 | 5.42E-02 | -2.56E-01 | -2.50E-01 | -5.05E-01 | -8.62E-01 | -1.27E+00 |
| A6 | -2.14E-02 | 6.54E-03 | -2.80E-02 | 1.03E-01 | 6.81E-01 | 1.45E+00 |
| A8 | 1.28E-02 | 1.37E-02 | 1.83E-02 | -5.76E-02 | -1.54E-01 | 1.60E-01 |
| A10 | -8.06E-03 | -4.78E-03 | -2.14E-03 | 4.66E-02 | 4.03E-03 | 1.09E-01 |
| A12 | 2.16E-03 | 3.57E-03 | 4.63E-03 | -1.87E-02 | -7.62E-03 | -9.78E-02 |
| A14 | -1.61E-03 | -6.92E-04 | -1.65E-03 | 1.26E-02 | 2.15E-02 | 2.84E-02 |
| A16 | 1.27E-03 | 1.33E-04 | -1.21E-04 | -5.40E-03 | -1.91E-02 | 2.94E-02 |
| A18 | -2.41E-04 | -4.39E-04 | -8.06E-04 | 1.83E-03 | 7.59E-03 | 4.40E-02 |
| A20 | 1.62E-04 | 1.64E-04 | 6.28E-04 | 2.45E-05 | -2.40E-03 | 8.54E-04 |
| A22 | -1.41E-05 | 6.74E-06 | -2.76E-05 | 4.07E-04 | 3.02E-03 | -1.90E-03 |
| A24 | 6.44E-05 | -9.84E-05 | -7.75E-05 | -1.98E-04 | -4.31E-03 | -4.22E-03 |
| A26 | -3.14E-05 | 9.36E-05 | 1.53E-04 | 4.71E-04 | 1.66E-03 | 6.34E-03 |
| A28 | -2.14E-06 | -3.27E-05 | -8.04E-05 | -2.01E-04 | 3.75E-03 | 4.75E-03 |
| A30 | -1.14E-05 | 4.09E-06 | 8.56E-06 | 1.24E-04 | 3.28E-04 | 2.59E-03 |
Fig. 10 shows on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of example 5. On-axis chromatic aberration means that the converging focus of light rays with different wavelengths deviates after passing through a lens; astigmatism means meridional image surface curvature and sagittal image surface curvature; the distortion represents the corresponding distortion magnitude values at different image heights. It can be seen from fig. 10 that the optical system given in embodiment 5 can achieve good imaging quality.
In examples 1-5, the base data are as follows:
table 11: EXAMPLES 1-5 basic data
| Basic data | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| f1(mm) | -1.94 | -1.99 | -2.02 | -1.86 | -1.91 |
| f2(mm) | 2.05 | 1.48 | 1.30 | 1.36 | 1.90 |
| f3(mm) | -3.34 | -10.81 | -5.05 | -3.68 | 100.00 |
| f4(mm) | 3.29 | -2.45 | -136.45 | 4.53 | 4.54 |
| f5(mm) | 2.42 | 1.10 | 24.00 | -48.56 | 275.57 |
| f6(mm) | -5.18 | -1.80 | 7.06 | 41.09 | -16.75 |
| f(mm) | 1.23 | 1.30 | 1.30 | 1.35 | 1.39 |
| TTL(mm) | 5.10 | 5.06 | 5.10 | 5.10 | 5.10 |
| FOV(°) | 168.76 | 169.55 | 169.74 | 169.92 | 170.00 |
| f/EPD | 2.40 | 2.40 | 2.40 | 2.40 | 2.40 |
In examples 1 to 5, each conditional expression satisfies the condition of the following table:
table 12: examples 1 to 5 each of the conditions
The camera module at least comprises an optical lens, wherein the ultra-wide angle small-caliber ultra-thin optical system is arranged in the optical lens, and through reasonable focal power distribution and high-order aspheric surface parameter optimization selection, the camera module can realize miniaturization and simultaneously has the functions of small head and ultra-wide angle shooting, has the advantages of ultra-wide angle, miniaturization and ultra-thin, has a compact structure, is convenient to process and install, and has good imaging resolving power.
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. An ultra-wide angle small-caliber ultra-thin optical system is characterized in that: the lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object plane to an image plane along an optical axis;
the object plane side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens is a convex surface, the image plane side is a convex surface, and the focal power of the second lens is positive;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has optical power;
the object plane side of the sixth lens is a convex surface, and the image plane side is a concave surface, and has optical power;
the optical system satisfies the following conditions:
87<FOV/(TTL/IamgH/DT11)<100；
wherein, FOV is the maximum angle of view of the optical system, TTL is the on-axis distance from the first lens object side to the imaging plane, imgH is half the diagonal length of the effective pixel area on the imaging plane, and DT11 is the maximum effective radius of the first lens object side.
2. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions:
0.7<(f5-f6)/f5<3.2；
wherein f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.
3. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions:
1.2<|R8|/R2<3.8；
wherein R2 is the radius of curvature of the image side surface of the first lens element, and R8 is the radius of curvature of the image side surface of the fourth lens element; and/or
-3.3<R3/R4<-1.0；
Wherein R3 is the radius of curvature of the object-side surface of the second lens element, and R4 is the radius of curvature of the image-side surface of the second lens element.
4. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions:
0<R12/R11+|SAG12/SAG11|<1.2；
wherein, R11 is the radius of curvature of the object side surface of the sixth lens, R12 is the radius of curvature of the image side surface of the sixth lens, SAG11 is the distance from the maximum effective clear aperture of the object side surface of the sixth lens to the direction parallel to the optical axis at the intersection point of the object side surface of the sixth lens and the optical axis, and SAG12 is the distance from the maximum effective clear aperture of the image side surface of the sixth lens to the direction parallel to the optical axis at the intersection point of the image side surface of the sixth lens and the optical axis; and/or
-4.1<DT52/SAG10<-2.1；
Wherein DT52 is the maximum effective radius of the fifth lens image-side surface, SAG10 is the distance from the maximum effective clear aperture of the fifth lens image-side surface to the intersection point of the fifth lens image-side surface and the optical axis, which is parallel to the optical axis direction.
5. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions:
0.7<(CT5+CT6)/T12<1.4；
wherein, CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T12 is the air interval between the first lens and the second lens on the optical axis; and/or
2.3<ΣCT/ΣAT<3.0；
Wherein Σct is the sum of thicknesses of centers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, Σat is the sum of air intervals between two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis.
6. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions:
0.7<f12/f23<1.7；
wherein f12 is the effective combined focal length of the first lens and the second lens, and f23 is the effective combined focal length of the second lens and the third lens; and/or
0<f/R11<1.8；
Where f is the effective focal length of the optical imaging system, and R11 is the radius of curvature of the object side surface of the sixth lens.
7. The ultra-wide angle, small caliber, ultra-thin optical system according to claim 1, wherein the optical system satisfies the following conditions: 1.4< (DT 62-DT 61)/|DT 12-DT11| <2.4;
wherein, DT11 is the maximum effective radius of the first lens object-side surface, DT12 is the maximum effective radius of the first lens image-side surface, DT61 is the maximum effective radius of the sixth lens object-side surface, and DT62 is the maximum effective radius of the sixth lens image-side surface; and/or
12<f*tan(HFOV)/T12<18；
Where f is the effective focal length of the optical system, HFOV is half the maximum field angle of the optical system, and T12 is the air separation of the first and second lenses on the optical axis.
8. The ultra-wide-angle small-caliber ultra-thin optical system according to any one of claims 1-7, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
9. The ultra-wide angle small-caliber ultra-thin optical system according to any one of claims 1-7, wherein the maximum effective radius DT11 of the first lens object-side surface satisfies: DT11<1.6mm;
the F number of the optical system is 2.4;
the full field angle FOV of the optical system satisfies: FOV >168 °;
the total optical length TTL of the optical system satisfies the following conditions: TTL is less than or equal to 5.1mm.
10. An imaging module comprising at least an optical lens, wherein the ultra-wide angle small-caliber ultra-thin optical system as claimed in any one of claims 1 to 9 is installed in the optical lens.
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Inventor after: You Xinghai Inventor after: Pan Zhengjiang Inventor after: Zhao Weiping Inventor after: Xiong Guangze Inventor after: Yang Linsong Inventor before: You Xinghai Inventor before: Pan Zhengjiang Inventor before: Zhao Weiping Inventor before: Xiong Guangze Inventor before: Yang Songlin |